/****************************** Created May 25 2023 by R.Kessler Catenated .c files and yaml_private.h from https://github.com/yaml/libyaml *****************************/ #if HAVE_CONFIG_H #include "config.h" #endif //#include #include "yaml.h" #include #include #include /* * Memory management. */ YAML_DECLARE(void *) yaml_malloc(size_t size); YAML_DECLARE(void *) yaml_realloc(void *ptr, size_t size); YAML_DECLARE(void) yaml_free(void *ptr); YAML_DECLARE(yaml_char_t *) yaml_strdup(const yaml_char_t *); /* * Reader: Ensure that the buffer contains at least `length` characters. */ YAML_DECLARE(int) yaml_parser_update_buffer(yaml_parser_t *parser, size_t length); /* * Scanner: Ensure that the token stack contains at least one token ready. */ YAML_DECLARE(int) yaml_parser_fetch_more_tokens(yaml_parser_t *parser); /* * The size of the input raw buffer. */ #define INPUT_RAW_BUFFER_SIZE 16384 /* * The size of the input buffer. * * It should be possible to decode the whole raw buffer. */ #define INPUT_BUFFER_SIZE (INPUT_RAW_BUFFER_SIZE*3) /* * The size of the output buffer. */ #define OUTPUT_BUFFER_SIZE 16384 /* * The size of the output raw buffer. * * It should be possible to encode the whole output buffer. */ #define OUTPUT_RAW_BUFFER_SIZE (OUTPUT_BUFFER_SIZE*2+2) /* * The maximum size of a YAML input file. * This used to be PTRDIFF_MAX, but that's not entirely portable * because stdint.h isn't available on all platforms. * It is not entirely clear why this isn't the maximum value * that can fit into the parser->offset field. */ #define MAX_FILE_SIZE (~(size_t)0 / 2) /* * The size of other stacks and queues. */ #define INITIAL_STACK_SIZE 16 #define INITIAL_QUEUE_SIZE 16 #define INITIAL_STRING_SIZE 16 /* * Buffer management. */ #define BUFFER_INIT(context,buffer,size) \ (((buffer).start = (yaml_char_t *)yaml_malloc(size)) ? \ ((buffer).last = (buffer).pointer = (buffer).start, \ (buffer).end = (buffer).start+(size), \ 1) : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) #define BUFFER_DEL(context,buffer) \ (yaml_free((buffer).start), \ (buffer).start = (buffer).pointer = (buffer).end = 0) /* * String management. */ typedef struct { yaml_char_t *start; yaml_char_t *end; yaml_char_t *pointer; } yaml_string_t; YAML_DECLARE(int) yaml_string_extend(yaml_char_t **start, yaml_char_t **pointer, yaml_char_t **end); YAML_DECLARE(int) yaml_string_join( yaml_char_t **a_start, yaml_char_t **a_pointer, yaml_char_t **a_end, yaml_char_t **b_start, yaml_char_t **b_pointer, yaml_char_t **b_end); #define NULL_STRING { NULL, NULL, NULL } #define STRING(string,length) { (string), (string)+(length), (string) } #define STRING_ASSIGN(value,string,length) \ ((value).start = (string), \ (value).end = (string)+(length), \ (value).pointer = (string)) #define STRING_INIT(context,string,size) \ (((string).start = YAML_MALLOC(size)) ? \ ((string).pointer = (string).start, \ (string).end = (string).start+(size), \ memset((string).start, 0, (size)), \ 1) : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) #define STRING_DEL(context,string) \ (yaml_free((string).start), \ (string).start = (string).pointer = (string).end = 0) #define STRING_EXTEND(context,string) \ ((((string).pointer+5 < (string).end) \ || yaml_string_extend(&(string).start, \ &(string).pointer, &(string).end)) ? \ 1 : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) #define CLEAR(context,string) \ ((string).pointer = (string).start, \ memset((string).start, 0, (string).end-(string).start)) #define JOIN(context,string_a,string_b) \ ((yaml_string_join(&(string_a).start, &(string_a).pointer, \ &(string_a).end, &(string_b).start, \ &(string_b).pointer, &(string_b).end)) ? \ ((string_b).pointer = (string_b).start, \ 1) : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) /* * String check operations. */ /* * Check the octet at the specified position. */ #define CHECK_AT(string,octet,offset) \ ((string).pointer[offset] == (yaml_char_t)(octet)) /* * Check the current octet in the buffer. */ #define CHECK(string,octet) (CHECK_AT((string),(octet),0)) /* * Check if the character at the specified position is an alphabetical * character, a digit, '_', or '-'. */ #define IS_ALPHA_AT(string,offset) \ (((string).pointer[offset] >= (yaml_char_t) '0' && \ (string).pointer[offset] <= (yaml_char_t) '9') || \ ((string).pointer[offset] >= (yaml_char_t) 'A' && \ (string).pointer[offset] <= (yaml_char_t) 'Z') || \ ((string).pointer[offset] >= (yaml_char_t) 'a' && \ (string).pointer[offset] <= (yaml_char_t) 'z') || \ (string).pointer[offset] == '_' || \ (string).pointer[offset] == '-') #define IS_ALPHA(string) IS_ALPHA_AT((string),0) /* * Check if the character at the specified position is a digit. */ #define IS_DIGIT_AT(string,offset) \ (((string).pointer[offset] >= (yaml_char_t) '0' && \ (string).pointer[offset] <= (yaml_char_t) '9')) #define IS_DIGIT(string) IS_DIGIT_AT((string),0) /* * Get the value of a digit. */ #define AS_DIGIT_AT(string,offset) \ ((string).pointer[offset] - (yaml_char_t) '0') #define AS_DIGIT(string) AS_DIGIT_AT((string),0) /* * Check if the character at the specified position is a hex-digit. */ #define IS_HEX_AT(string,offset) \ (((string).pointer[offset] >= (yaml_char_t) '0' && \ (string).pointer[offset] <= (yaml_char_t) '9') || \ ((string).pointer[offset] >= (yaml_char_t) 'A' && \ (string).pointer[offset] <= (yaml_char_t) 'F') || \ ((string).pointer[offset] >= (yaml_char_t) 'a' && \ (string).pointer[offset] <= (yaml_char_t) 'f')) #define IS_HEX(string) IS_HEX_AT((string),0) /* * Get the value of a hex-digit. */ #define AS_HEX_AT(string,offset) \ (((string).pointer[offset] >= (yaml_char_t) 'A' && \ (string).pointer[offset] <= (yaml_char_t) 'F') ? \ ((string).pointer[offset] - (yaml_char_t) 'A' + 10) : \ ((string).pointer[offset] >= (yaml_char_t) 'a' && \ (string).pointer[offset] <= (yaml_char_t) 'f') ? \ ((string).pointer[offset] - (yaml_char_t) 'a' + 10) : \ ((string).pointer[offset] - (yaml_char_t) '0')) #define AS_HEX(string) AS_HEX_AT((string),0) /* * Check if the character is ASCII. */ #define IS_ASCII_AT(string,offset) \ ((string).pointer[offset] <= (yaml_char_t) '\x7F') #define IS_ASCII(string) IS_ASCII_AT((string),0) /* * Check if the character can be printed unescaped. */ #define IS_PRINTABLE_AT(string,offset) \ (((string).pointer[offset] == 0x0A) /* . == #x0A */ \ || ((string).pointer[offset] >= 0x20 /* #x20 <= . <= #x7E */ \ && (string).pointer[offset] <= 0x7E) \ || ((string).pointer[offset] == 0xC2 /* #0xA0 <= . <= #xD7FF */ \ && (string).pointer[offset+1] >= 0xA0) \ || ((string).pointer[offset] > 0xC2 \ && (string).pointer[offset] < 0xED) \ || ((string).pointer[offset] == 0xED \ && (string).pointer[offset+1] < 0xA0) \ || ((string).pointer[offset] == 0xEE) \ || ((string).pointer[offset] == 0xEF /* #xE000 <= . <= #xFFFD */ \ && !((string).pointer[offset+1] == 0xBB /* && . != #xFEFF */ \ && (string).pointer[offset+2] == 0xBF) \ && !((string).pointer[offset+1] == 0xBF \ && ((string).pointer[offset+2] == 0xBE \ || (string).pointer[offset+2] == 0xBF)))) #define IS_PRINTABLE(string) IS_PRINTABLE_AT((string),0) /* * Check if the character at the specified position is NUL. */ #define IS_Z_AT(string,offset) CHECK_AT((string),'\0',(offset)) #define IS_Z(string) IS_Z_AT((string),0) /* * Check if the character at the specified position is BOM. */ #define IS_BOM_AT(string,offset) \ (CHECK_AT((string),'\xEF',(offset)) \ && CHECK_AT((string),'\xBB',(offset)+1) \ && CHECK_AT((string),'\xBF',(offset)+2)) /* BOM (#xFEFF) */ #define IS_BOM(string) IS_BOM_AT(string,0) /* * Check if the character at the specified position is space. */ #define IS_SPACE_AT(string,offset) CHECK_AT((string),' ',(offset)) #define IS_SPACE(string) IS_SPACE_AT((string),0) /* * Check if the character at the specified position is tab. */ #define IS_TAB_AT(string,offset) CHECK_AT((string),'\t',(offset)) #define IS_TAB(string) IS_TAB_AT((string),0) /* * Check if the character at the specified position is blank (space or tab). */ #define IS_BLANK_AT(string,offset) \ (IS_SPACE_AT((string),(offset)) || IS_TAB_AT((string),(offset))) #define IS_BLANK(string) IS_BLANK_AT((string),0) /* * Check if the character at the specified position is a line break. */ #define IS_BREAK_AT(string,offset) \ (CHECK_AT((string),'\r',(offset)) /* CR (#xD)*/ \ || CHECK_AT((string),'\n',(offset)) /* LF (#xA) */ \ || (CHECK_AT((string),'\xC2',(offset)) \ && CHECK_AT((string),'\x85',(offset)+1)) /* NEL (#x85) */ \ || (CHECK_AT((string),'\xE2',(offset)) \ && CHECK_AT((string),'\x80',(offset)+1) \ && CHECK_AT((string),'\xA8',(offset)+2)) /* LS (#x2028) */ \ || (CHECK_AT((string),'\xE2',(offset)) \ && CHECK_AT((string),'\x80',(offset)+1) \ && CHECK_AT((string),'\xA9',(offset)+2))) /* PS (#x2029) */ #define IS_BREAK(string) IS_BREAK_AT((string),0) #define IS_CRLF_AT(string,offset) \ (CHECK_AT((string),'\r',(offset)) && CHECK_AT((string),'\n',(offset)+1)) #define IS_CRLF(string) IS_CRLF_AT((string),0) /* * Check if the character is a line break or NUL. */ #define IS_BREAKZ_AT(string,offset) \ (IS_BREAK_AT((string),(offset)) || IS_Z_AT((string),(offset))) #define IS_BREAKZ(string) IS_BREAKZ_AT((string),0) /* * Check if the character is a line break, space, or NUL. */ #define IS_SPACEZ_AT(string,offset) \ (IS_SPACE_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset))) #define IS_SPACEZ(string) IS_SPACEZ_AT((string),0) /* * Check if the character is a line break, space, tab, or NUL. */ #define IS_BLANKZ_AT(string,offset) \ (IS_BLANK_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset))) #define IS_BLANKZ(string) IS_BLANKZ_AT((string),0) /* * Determine the width of the character. */ #define WIDTH_AT(string,offset) \ (((string).pointer[offset] & 0x80) == 0x00 ? 1 : \ ((string).pointer[offset] & 0xE0) == 0xC0 ? 2 : \ ((string).pointer[offset] & 0xF0) == 0xE0 ? 3 : \ ((string).pointer[offset] & 0xF8) == 0xF0 ? 4 : 0) #define WIDTH(string) WIDTH_AT((string),0) /* * Move the string pointer to the next character. */ #define MOVE(string) ((string).pointer += WIDTH((string))) /* * Copy a character and move the pointers of both strings. */ #define COPY(string_a,string_b) \ ((*(string_b).pointer & 0x80) == 0x00 ? \ (*((string_a).pointer++) = *((string_b).pointer++)) : \ (*(string_b).pointer & 0xE0) == 0xC0 ? \ (*((string_a).pointer++) = *((string_b).pointer++), \ *((string_a).pointer++) = *((string_b).pointer++)) : \ (*(string_b).pointer & 0xF0) == 0xE0 ? \ (*((string_a).pointer++) = *((string_b).pointer++), \ *((string_a).pointer++) = *((string_b).pointer++), \ *((string_a).pointer++) = *((string_b).pointer++)) : \ (*(string_b).pointer & 0xF8) == 0xF0 ? \ (*((string_a).pointer++) = *((string_b).pointer++), \ *((string_a).pointer++) = *((string_b).pointer++), \ *((string_a).pointer++) = *((string_b).pointer++), \ *((string_a).pointer++) = *((string_b).pointer++)) : 0) /* * Stack and queue management. */ YAML_DECLARE(int) yaml_stack_extend(void **start, void **top, void **end); YAML_DECLARE(int) yaml_queue_extend(void **start, void **head, void **tail, void **end); #define STACK_INIT(context,stack,type) \ (((stack).start = (type)yaml_malloc(INITIAL_STACK_SIZE*sizeof(*(stack).start))) ? \ ((stack).top = (stack).start, \ (stack).end = (stack).start+INITIAL_STACK_SIZE, \ 1) : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) #define STACK_DEL(context,stack) \ (yaml_free((stack).start), \ (stack).start = (stack).top = (stack).end = 0) #define STACK_EMPTY(context,stack) \ ((stack).start == (stack).top) #define STACK_LIMIT(context,stack,size) \ ((stack).top - (stack).start < (size) ? \ 1 : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) #define PUSH(context,stack,value) \ (((stack).top != (stack).end \ || yaml_stack_extend((void **)&(stack).start, \ (void **)&(stack).top, (void **)&(stack).end)) ? \ (*((stack).top++) = value, \ 1) : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) #define POP(context,stack) \ (*(--(stack).top)) #define QUEUE_INIT(context,queue,size,type) \ (((queue).start = (type)yaml_malloc((size)*sizeof(*(queue).start))) ? \ ((queue).head = (queue).tail = (queue).start, \ (queue).end = (queue).start+(size), \ 1) : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) #define QUEUE_DEL(context,queue) \ (yaml_free((queue).start), \ (queue).start = (queue).head = (queue).tail = (queue).end = 0) #define QUEUE_EMPTY(context,queue) \ ((queue).head == (queue).tail) #define ENQUEUE(context,queue,value) \ (((queue).tail != (queue).end \ || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head, \ (void **)&(queue).tail, (void **)&(queue).end)) ? \ (*((queue).tail++) = value, \ 1) : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) #define DEQUEUE(context,queue) \ (*((queue).head++)) #define QUEUE_INSERT(context,queue,index,value) \ (((queue).tail != (queue).end \ || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head, \ (void **)&(queue).tail, (void **)&(queue).end)) ? \ (memmove((queue).head+(index)+1,(queue).head+(index), \ ((queue).tail-(queue).head-(index))*sizeof(*(queue).start)), \ *((queue).head+(index)) = value, \ (queue).tail++, \ 1) : \ ((context)->error = YAML_MEMORY_ERROR, \ 0)) /* * Token initializers. */ #define TOKEN_INIT(token,token_type,token_start_mark,token_end_mark) \ (memset(&(token), 0, sizeof(yaml_token_t)), \ (token).type = (token_type), \ (token).start_mark = (token_start_mark), \ (token).end_mark = (token_end_mark)) #define STREAM_START_TOKEN_INIT(token,token_encoding,start_mark,end_mark) \ (TOKEN_INIT((token),YAML_STREAM_START_TOKEN,(start_mark),(end_mark)), \ (token).data.stream_start.encoding = (token_encoding)) #define STREAM_END_TOKEN_INIT(token,start_mark,end_mark) \ (TOKEN_INIT((token),YAML_STREAM_END_TOKEN,(start_mark),(end_mark))) #define ALIAS_TOKEN_INIT(token,token_value,start_mark,end_mark) \ (TOKEN_INIT((token),YAML_ALIAS_TOKEN,(start_mark),(end_mark)), \ (token).data.alias.value = (token_value)) #define ANCHOR_TOKEN_INIT(token,token_value,start_mark,end_mark) \ (TOKEN_INIT((token),YAML_ANCHOR_TOKEN,(start_mark),(end_mark)), \ (token).data.anchor.value = (token_value)) #define TAG_TOKEN_INIT(token,token_handle,token_suffix,start_mark,end_mark) \ (TOKEN_INIT((token),YAML_TAG_TOKEN,(start_mark),(end_mark)), \ (token).data.tag.handle = (token_handle), \ (token).data.tag.suffix = (token_suffix)) #define SCALAR_TOKEN_INIT(token,token_value,token_length,token_style,start_mark,end_mark) \ (TOKEN_INIT((token),YAML_SCALAR_TOKEN,(start_mark),(end_mark)), \ (token).data.scalar.value = (token_value), \ (token).data.scalar.length = (token_length), \ (token).data.scalar.style = (token_style)) #define VERSION_DIRECTIVE_TOKEN_INIT(token,token_major,token_minor,start_mark,end_mark) \ (TOKEN_INIT((token),YAML_VERSION_DIRECTIVE_TOKEN,(start_mark),(end_mark)), \ (token).data.version_directive.major = (token_major), \ (token).data.version_directive.minor = (token_minor)) #define TAG_DIRECTIVE_TOKEN_INIT(token,token_handle,token_prefix,start_mark,end_mark) \ (TOKEN_INIT((token),YAML_TAG_DIRECTIVE_TOKEN,(start_mark),(end_mark)), \ (token).data.tag_directive.handle = (token_handle), \ (token).data.tag_directive.prefix = (token_prefix)) /* * Event initializers. */ #define EVENT_INIT(event,event_type,event_start_mark,event_end_mark) \ (memset(&(event), 0, sizeof(yaml_event_t)), \ (event).type = (event_type), \ (event).start_mark = (event_start_mark), \ (event).end_mark = (event_end_mark)) #define STREAM_START_EVENT_INIT(event,event_encoding,start_mark,end_mark) \ (EVENT_INIT((event),YAML_STREAM_START_EVENT,(start_mark),(end_mark)), \ (event).data.stream_start.encoding = (event_encoding)) #define STREAM_END_EVENT_INIT(event,start_mark,end_mark) \ (EVENT_INIT((event),YAML_STREAM_END_EVENT,(start_mark),(end_mark))) #define DOCUMENT_START_EVENT_INIT(event,event_version_directive, \ event_tag_directives_start,event_tag_directives_end,event_implicit,start_mark,end_mark) \ (EVENT_INIT((event),YAML_DOCUMENT_START_EVENT,(start_mark),(end_mark)), \ (event).data.document_start.version_directive = (event_version_directive), \ (event).data.document_start.tag_directives.start = (event_tag_directives_start), \ (event).data.document_start.tag_directives.end = (event_tag_directives_end), \ (event).data.document_start.implicit = (event_implicit)) #define DOCUMENT_END_EVENT_INIT(event,event_implicit,start_mark,end_mark) \ (EVENT_INIT((event),YAML_DOCUMENT_END_EVENT,(start_mark),(end_mark)), \ (event).data.document_end.implicit = (event_implicit)) #define ALIAS_EVENT_INIT(event,event_anchor,start_mark,end_mark) \ (EVENT_INIT((event),YAML_ALIAS_EVENT,(start_mark),(end_mark)), \ (event).data.alias.anchor = (event_anchor)) #define SCALAR_EVENT_INIT(event,event_anchor,event_tag,event_value,event_length, \ event_plain_implicit, event_quoted_implicit,event_style,start_mark,end_mark) \ (EVENT_INIT((event),YAML_SCALAR_EVENT,(start_mark),(end_mark)), \ (event).data.scalar.anchor = (event_anchor), \ (event).data.scalar.tag = (event_tag), \ (event).data.scalar.value = (event_value), \ (event).data.scalar.length = (event_length), \ (event).data.scalar.plain_implicit = (event_plain_implicit), \ (event).data.scalar.quoted_implicit = (event_quoted_implicit), \ (event).data.scalar.style = (event_style)) #define SEQUENCE_START_EVENT_INIT(event,event_anchor,event_tag, \ event_implicit,event_style,start_mark,end_mark) \ (EVENT_INIT((event),YAML_SEQUENCE_START_EVENT,(start_mark),(end_mark)), \ (event).data.sequence_start.anchor = (event_anchor), \ (event).data.sequence_start.tag = (event_tag), \ (event).data.sequence_start.implicit = (event_implicit), \ (event).data.sequence_start.style = (event_style)) #define SEQUENCE_END_EVENT_INIT(event,start_mark,end_mark) \ (EVENT_INIT((event),YAML_SEQUENCE_END_EVENT,(start_mark),(end_mark))) #define MAPPING_START_EVENT_INIT(event,event_anchor,event_tag, \ event_implicit,event_style,start_mark,end_mark) \ (EVENT_INIT((event),YAML_MAPPING_START_EVENT,(start_mark),(end_mark)), \ (event).data.mapping_start.anchor = (event_anchor), \ (event).data.mapping_start.tag = (event_tag), \ (event).data.mapping_start.implicit = (event_implicit), \ (event).data.mapping_start.style = (event_style)) #define MAPPING_END_EVENT_INIT(event,start_mark,end_mark) \ (EVENT_INIT((event),YAML_MAPPING_END_EVENT,(start_mark),(end_mark))) /* * Document initializer. */ #define DOCUMENT_INIT(document,document_nodes_start,document_nodes_end, \ document_version_directive,document_tag_directives_start, \ document_tag_directives_end,document_start_implicit, \ document_end_implicit,document_start_mark,document_end_mark) \ (memset(&(document), 0, sizeof(yaml_document_t)), \ (document).nodes.start = (document_nodes_start), \ (document).nodes.end = (document_nodes_end), \ (document).nodes.top = (document_nodes_start), \ (document).version_directive = (document_version_directive), \ (document).tag_directives.start = (document_tag_directives_start), \ (document).tag_directives.end = (document_tag_directives_end), \ (document).start_implicit = (document_start_implicit), \ (document).end_implicit = (document_end_implicit), \ (document).start_mark = (document_start_mark), \ (document).end_mark = (document_end_mark)) /* * Node initializers. */ #define NODE_INIT(node,node_type,node_tag,node_start_mark,node_end_mark) \ (memset(&(node), 0, sizeof(yaml_node_t)), \ (node).type = (node_type), \ (node).tag = (node_tag), \ (node).start_mark = (node_start_mark), \ (node).end_mark = (node_end_mark)) #define SCALAR_NODE_INIT(node,node_tag,node_value,node_length, \ node_style,start_mark,end_mark) \ (NODE_INIT((node),YAML_SCALAR_NODE,(node_tag),(start_mark),(end_mark)), \ (node).data.scalar.value = (node_value), \ (node).data.scalar.length = (node_length), \ (node).data.scalar.style = (node_style)) #define SEQUENCE_NODE_INIT(node,node_tag,node_items_start,node_items_end, \ node_style,start_mark,end_mark) \ (NODE_INIT((node),YAML_SEQUENCE_NODE,(node_tag),(start_mark),(end_mark)), \ (node).data.sequence.items.start = (node_items_start), \ (node).data.sequence.items.end = (node_items_end), \ (node).data.sequence.items.top = (node_items_start), \ (node).data.sequence.style = (node_style)) #define MAPPING_NODE_INIT(node,node_tag,node_pairs_start,node_pairs_end, \ node_style,start_mark,end_mark) \ (NODE_INIT((node),YAML_MAPPING_NODE,(node_tag),(start_mark),(end_mark)), \ (node).data.mapping.pairs.start = (node_pairs_start), \ (node).data.mapping.pairs.end = (node_pairs_end), \ (node).data.mapping.pairs.top = (node_pairs_start), \ (node).data.mapping.style = (node_style)) /* Strict C compiler warning helpers */ #if defined(__clang__) || defined(__GNUC__) # define HASATTRIBUTE_UNUSED #endif #ifdef HASATTRIBUTE_UNUSED # define __attribute__unused__ __attribute__((__unused__)) #else # define __attribute__unused__ #endif /* Shim arguments are arguments that must be included in your function, * but serve no purpose inside. Silence compiler warnings. */ #define SHIM(a) /*@unused@*/ a __attribute__unused__ /* UNUSED_PARAM() marks a shim argument in the body to silence compiler warnings */ #ifdef __clang__ # define UNUSED_PARAM(a) (void)(a); #else # define UNUSED_PARAM(a) /*@-noeffect*/if (0) (void)(a)/*@=noeffect*/; #endif #define YAML_MALLOC_STATIC(type) (type*)yaml_malloc(sizeof(type)) #define YAML_MALLOC(size) (yaml_char_t *)yaml_malloc(size) /* xxxxxxxxx mark delete xxxxxxxx // * Get the library version. YAML_DECLARE(const char *) yaml_get_version_string(void) { return YAML_VERSION_STRING; } // Get the library version numbers. YAML_DECLARE(void) yaml_get_version(int *major, int *minor, int *patch) { *major = YAML_VERSION_MAJOR; *minor = YAML_VERSION_MINOR; *patch = YAML_VERSION_PATCH; } xxxxxxxxxxx end mark xxxxxxx */ /* * Allocate a dynamic memory block. */ YAML_DECLARE(void *) yaml_malloc(size_t size) { return malloc(size ? size : 1); } /* * Reallocate a dynamic memory block. */ YAML_DECLARE(void *) yaml_realloc(void *ptr, size_t size) { return ptr ? realloc(ptr, size ? size : 1) : malloc(size ? size : 1); } /* * Free a dynamic memory block. */ YAML_DECLARE(void) yaml_free(void *ptr) { if (ptr) free(ptr); } /* * Duplicate a string. */ YAML_DECLARE(yaml_char_t *) yaml_strdup(const yaml_char_t *str) { if (!str) return NULL; return (yaml_char_t *)strdup((char *)str); } /* * Extend a string. */ YAML_DECLARE(int) yaml_string_extend(yaml_char_t **start, yaml_char_t **pointer, yaml_char_t **end) { yaml_char_t *new_start = (yaml_char_t *)yaml_realloc((void*)*start, (*end - *start)*2); if (!new_start) return 0; memset(new_start + (*end - *start), 0, *end - *start); *pointer = new_start + (*pointer - *start); *end = new_start + (*end - *start)*2; *start = new_start; return 1; } /* * Append a string B to a string A. */ YAML_DECLARE(int) yaml_string_join( yaml_char_t **a_start, yaml_char_t **a_pointer, yaml_char_t **a_end, yaml_char_t **b_start, yaml_char_t **b_pointer, SHIM(yaml_char_t **b_end)) { UNUSED_PARAM(b_end) if (*b_start == *b_pointer) return 1; while (*a_end - *a_pointer <= *b_pointer - *b_start) { if (!yaml_string_extend(a_start, a_pointer, a_end)) return 0; } memcpy(*a_pointer, *b_start, *b_pointer - *b_start); *a_pointer += *b_pointer - *b_start; return 1; } /* * Extend a stack. */ YAML_DECLARE(int) yaml_stack_extend(void **start, void **top, void **end) { void *new_start; if ((char *)*end - (char *)*start >= INT_MAX / 2) return 0; new_start = yaml_realloc(*start, ((char *)*end - (char *)*start)*2); if (!new_start) return 0; *top = (char *)new_start + ((char *)*top - (char *)*start); *end = (char *)new_start + ((char *)*end - (char *)*start)*2; *start = new_start; return 1; } /* * Extend or move a queue. */ YAML_DECLARE(int) yaml_queue_extend(void **start, void **head, void **tail, void **end) { /* Check if we need to resize the queue. */ if (*start == *head && *tail == *end) { void *new_start = yaml_realloc(*start, ((char *)*end - (char *)*start)*2); if (!new_start) return 0; *head = (char *)new_start + ((char *)*head - (char *)*start); *tail = (char *)new_start + ((char *)*tail - (char *)*start); *end = (char *)new_start + ((char *)*end - (char *)*start)*2; *start = new_start; } /* Check if we need to move the queue at the beginning of the buffer. */ if (*tail == *end) { if (*head != *tail) { memmove(*start, *head, (char *)*tail - (char *)*head); } *tail = (char *)*tail - (char *)*head + (char *)*start; *head = *start; } return 1; } /* * Create a new parser object. */ YAML_DECLARE(int) yaml_parser_initialize(yaml_parser_t *parser) { assert(parser); /* Non-NULL parser object expected. */ memset(parser, 0, sizeof(yaml_parser_t)); if (!BUFFER_INIT(parser, parser->raw_buffer, INPUT_RAW_BUFFER_SIZE)) goto error; if (!BUFFER_INIT(parser, parser->buffer, INPUT_BUFFER_SIZE)) goto error; if (!QUEUE_INIT(parser, parser->tokens, INITIAL_QUEUE_SIZE, yaml_token_t*)) goto error; if (!STACK_INIT(parser, parser->indents, int*)) goto error; if (!STACK_INIT(parser, parser->simple_keys, yaml_simple_key_t*)) goto error; if (!STACK_INIT(parser, parser->states, yaml_parser_state_t*)) goto error; if (!STACK_INIT(parser, parser->marks, yaml_mark_t*)) goto error; if (!STACK_INIT(parser, parser->tag_directives, yaml_tag_directive_t*)) goto error; return 1; error: BUFFER_DEL(parser, parser->raw_buffer); BUFFER_DEL(parser, parser->buffer); QUEUE_DEL(parser, parser->tokens); STACK_DEL(parser, parser->indents); STACK_DEL(parser, parser->simple_keys); STACK_DEL(parser, parser->states); STACK_DEL(parser, parser->marks); STACK_DEL(parser, parser->tag_directives); return 0; } /* * Destroy a parser object. */ YAML_DECLARE(void) yaml_parser_delete(yaml_parser_t *parser) { assert(parser); /* Non-NULL parser object expected. */ BUFFER_DEL(parser, parser->raw_buffer); BUFFER_DEL(parser, parser->buffer); while (!QUEUE_EMPTY(parser, parser->tokens)) { yaml_token_delete(&DEQUEUE(parser, parser->tokens)); } QUEUE_DEL(parser, parser->tokens); STACK_DEL(parser, parser->indents); STACK_DEL(parser, parser->simple_keys); STACK_DEL(parser, parser->states); STACK_DEL(parser, parser->marks); while (!STACK_EMPTY(parser, parser->tag_directives)) { yaml_tag_directive_t tag_directive = POP(parser, parser->tag_directives); yaml_free(tag_directive.handle); yaml_free(tag_directive.prefix); } STACK_DEL(parser, parser->tag_directives); memset(parser, 0, sizeof(yaml_parser_t)); } /* * String read handler. */ static int yaml_string_read_handler(void *data, unsigned char *buffer, size_t size, size_t *size_read) { yaml_parser_t *parser = (yaml_parser_t *)data; if (parser->input.string.current == parser->input.string.end) { *size_read = 0; return 1; } if (size > (size_t)(parser->input.string.end - parser->input.string.current)) { size = parser->input.string.end - parser->input.string.current; } memcpy(buffer, parser->input.string.current, size); parser->input.string.current += size; *size_read = size; return 1; } /* * File read handler. */ static int yaml_file_read_handler(void *data, unsigned char *buffer, size_t size, size_t *size_read) { yaml_parser_t *parser = (yaml_parser_t *)data; *size_read = fread(buffer, 1, size, parser->input.file); return !ferror(parser->input.file); } /* * Set a string input. */ YAML_DECLARE(void) yaml_parser_set_input_string(yaml_parser_t *parser, const unsigned char *input, size_t size) { assert(parser); /* Non-NULL parser object expected. */ assert(!parser->read_handler); /* You can set the source only once. */ assert(input); /* Non-NULL input string expected. */ parser->read_handler = yaml_string_read_handler; parser->read_handler_data = parser; parser->input.string.start = input; parser->input.string.current = input; parser->input.string.end = input+size; } /* * Set a file input. */ YAML_DECLARE(void) yaml_parser_set_input_file(yaml_parser_t *parser, FILE *file) { assert(parser); /* Non-NULL parser object expected. */ assert(!parser->read_handler); /* You can set the source only once. */ assert(file); /* Non-NULL file object expected. */ parser->read_handler = yaml_file_read_handler; parser->read_handler_data = parser; parser->input.file = file; } /* * Set a generic input. */ YAML_DECLARE(void) yaml_parser_set_input(yaml_parser_t *parser, yaml_read_handler_t *handler, void *data) { assert(parser); /* Non-NULL parser object expected. */ assert(!parser->read_handler); /* You can set the source only once. */ assert(handler); /* Non-NULL read handler expected. */ parser->read_handler = handler; parser->read_handler_data = data; } /* * Set the source encoding. */ YAML_DECLARE(void) yaml_parser_set_encoding(yaml_parser_t *parser, yaml_encoding_t encoding) { assert(parser); /* Non-NULL parser object expected. */ assert(!parser->encoding); /* Encoding is already set or detected. */ parser->encoding = encoding; } /* * Create a new emitter object. */ YAML_DECLARE(int) yaml_emitter_initialize(yaml_emitter_t *emitter) { assert(emitter); /* Non-NULL emitter object expected. */ memset(emitter, 0, sizeof(yaml_emitter_t)); if (!BUFFER_INIT(emitter, emitter->buffer, OUTPUT_BUFFER_SIZE)) goto error; if (!BUFFER_INIT(emitter, emitter->raw_buffer, OUTPUT_RAW_BUFFER_SIZE)) goto error; if (!STACK_INIT(emitter, emitter->states, yaml_emitter_state_t*)) goto error; if (!QUEUE_INIT(emitter, emitter->events, INITIAL_QUEUE_SIZE, yaml_event_t*)) goto error; if (!STACK_INIT(emitter, emitter->indents, int*)) goto error; if (!STACK_INIT(emitter, emitter->tag_directives, yaml_tag_directive_t*)) goto error; return 1; error: BUFFER_DEL(emitter, emitter->buffer); BUFFER_DEL(emitter, emitter->raw_buffer); STACK_DEL(emitter, emitter->states); QUEUE_DEL(emitter, emitter->events); STACK_DEL(emitter, emitter->indents); STACK_DEL(emitter, emitter->tag_directives); return 0; } /* * Destroy an emitter object. */ YAML_DECLARE(void) yaml_emitter_delete(yaml_emitter_t *emitter) { assert(emitter); /* Non-NULL emitter object expected. */ BUFFER_DEL(emitter, emitter->buffer); BUFFER_DEL(emitter, emitter->raw_buffer); STACK_DEL(emitter, emitter->states); while (!QUEUE_EMPTY(emitter, emitter->events)) { yaml_event_delete(&DEQUEUE(emitter, emitter->events)); } QUEUE_DEL(emitter, emitter->events); STACK_DEL(emitter, emitter->indents); while (!STACK_EMPTY(empty, emitter->tag_directives)) { yaml_tag_directive_t tag_directive = POP(emitter, emitter->tag_directives); yaml_free(tag_directive.handle); yaml_free(tag_directive.prefix); } STACK_DEL(emitter, emitter->tag_directives); yaml_free(emitter->anchors); memset(emitter, 0, sizeof(yaml_emitter_t)); } /* * String write handler. */ static int yaml_string_write_handler(void *data, unsigned char *buffer, size_t size) { yaml_emitter_t *emitter = (yaml_emitter_t *)data; if (emitter->output.string.size - *emitter->output.string.size_written < size) { memcpy(emitter->output.string.buffer + *emitter->output.string.size_written, buffer, emitter->output.string.size - *emitter->output.string.size_written); *emitter->output.string.size_written = emitter->output.string.size; return 0; } memcpy(emitter->output.string.buffer + *emitter->output.string.size_written, buffer, size); *emitter->output.string.size_written += size; return 1; } /* * File write handler. */ static int yaml_file_write_handler(void *data, unsigned char *buffer, size_t size) { yaml_emitter_t *emitter = (yaml_emitter_t *)data; return (fwrite(buffer, 1, size, emitter->output.file) == size); } /* * Set a string output. */ YAML_DECLARE(void) yaml_emitter_set_output_string(yaml_emitter_t *emitter, unsigned char *output, size_t size, size_t *size_written) { assert(emitter); /* Non-NULL emitter object expected. */ assert(!emitter->write_handler); /* You can set the output only once. */ assert(output); /* Non-NULL output string expected. */ emitter->write_handler = yaml_string_write_handler; emitter->write_handler_data = emitter; emitter->output.string.buffer = output; emitter->output.string.size = size; emitter->output.string.size_written = size_written; *size_written = 0; } /* * Set a file output. */ YAML_DECLARE(void) yaml_emitter_set_output_file(yaml_emitter_t *emitter, FILE *file) { assert(emitter); /* Non-NULL emitter object expected. */ assert(!emitter->write_handler); /* You can set the output only once. */ assert(file); /* Non-NULL file object expected. */ emitter->write_handler = yaml_file_write_handler; emitter->write_handler_data = emitter; emitter->output.file = file; } /* * Set a generic output handler. */ YAML_DECLARE(void) yaml_emitter_set_output(yaml_emitter_t *emitter, yaml_write_handler_t *handler, void *data) { assert(emitter); /* Non-NULL emitter object expected. */ assert(!emitter->write_handler); /* You can set the output only once. */ assert(handler); /* Non-NULL handler object expected. */ emitter->write_handler = handler; emitter->write_handler_data = data; } /* * Set the output encoding. */ YAML_DECLARE(void) yaml_emitter_set_encoding(yaml_emitter_t *emitter, yaml_encoding_t encoding) { assert(emitter); /* Non-NULL emitter object expected. */ assert(!emitter->encoding); /* You can set encoding only once. */ emitter->encoding = encoding; } /* * Set the canonical output style. */ YAML_DECLARE(void) yaml_emitter_set_canonical(yaml_emitter_t *emitter, int canonical) { assert(emitter); /* Non-NULL emitter object expected. */ emitter->canonical = (canonical != 0); } /* * Set the indentation increment. */ YAML_DECLARE(void) yaml_emitter_set_indent(yaml_emitter_t *emitter, int indent) { assert(emitter); /* Non-NULL emitter object expected. */ emitter->best_indent = (1 < indent && indent < 10) ? indent : 2; } /* * Set the preferred line width. */ YAML_DECLARE(void) yaml_emitter_set_width(yaml_emitter_t *emitter, int width) { assert(emitter); /* Non-NULL emitter object expected. */ emitter->best_width = (width >= 0) ? width : -1; } /* * Set if unescaped non-ASCII characters are allowed. */ YAML_DECLARE(void) yaml_emitter_set_unicode(yaml_emitter_t *emitter, int unicode) { assert(emitter); /* Non-NULL emitter object expected. */ emitter->unicode = (unicode != 0); } /* * Set the preferred line break character. */ YAML_DECLARE(void) yaml_emitter_set_break(yaml_emitter_t *emitter, yaml_break_t line_break) { assert(emitter); /* Non-NULL emitter object expected. */ emitter->line_break = line_break; } /* * Destroy a token object. */ YAML_DECLARE(void) yaml_token_delete(yaml_token_t *token) { assert(token); /* Non-NULL token object expected. */ switch (token->type) { case YAML_TAG_DIRECTIVE_TOKEN: yaml_free(token->data.tag_directive.handle); yaml_free(token->data.tag_directive.prefix); break; case YAML_ALIAS_TOKEN: yaml_free(token->data.alias.value); break; case YAML_ANCHOR_TOKEN: yaml_free(token->data.anchor.value); break; case YAML_TAG_TOKEN: yaml_free(token->data.tag.handle); yaml_free(token->data.tag.suffix); break; case YAML_SCALAR_TOKEN: yaml_free(token->data.scalar.value); break; default: break; } memset(token, 0, sizeof(yaml_token_t)); } /* * Check if a string is a valid UTF-8 sequence. * * Check 'reader.c' for more details on UTF-8 encoding. */ static int yaml_check_utf8(const yaml_char_t *start, size_t length) { const yaml_char_t *end = start+length; const yaml_char_t *pointer = start; while (pointer < end) { unsigned char octet; unsigned int width; unsigned int value; size_t k; octet = pointer[0]; width = (octet & 0x80) == 0x00 ? 1 : (octet & 0xE0) == 0xC0 ? 2 : (octet & 0xF0) == 0xE0 ? 3 : (octet & 0xF8) == 0xF0 ? 4 : 0; value = (octet & 0x80) == 0x00 ? octet & 0x7F : (octet & 0xE0) == 0xC0 ? octet & 0x1F : (octet & 0xF0) == 0xE0 ? octet & 0x0F : (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; if (!width) return 0; if (pointer+width > end) return 0; for (k = 1; k < width; k ++) { octet = pointer[k]; if ((octet & 0xC0) != 0x80) return 0; value = (value << 6) + (octet & 0x3F); } if (!((width == 1) || (width == 2 && value >= 0x80) || (width == 3 && value >= 0x800) || (width == 4 && value >= 0x10000))) return 0; pointer += width; } return 1; } /* * Create STREAM-START. */ YAML_DECLARE(int) yaml_stream_start_event_initialize(yaml_event_t *event, yaml_encoding_t encoding) { yaml_mark_t mark = { 0, 0, 0 }; assert(event); /* Non-NULL event object is expected. */ STREAM_START_EVENT_INIT(*event, encoding, mark, mark); return 1; } /* * Create STREAM-END. */ YAML_DECLARE(int) yaml_stream_end_event_initialize(yaml_event_t *event) { yaml_mark_t mark = { 0, 0, 0 }; assert(event); /* Non-NULL event object is expected. */ STREAM_END_EVENT_INIT(*event, mark, mark); return 1; } /* * Create DOCUMENT-START. */ YAML_DECLARE(int) yaml_document_start_event_initialize(yaml_event_t *event, yaml_version_directive_t *version_directive, yaml_tag_directive_t *tag_directives_start, yaml_tag_directive_t *tag_directives_end, int implicit) { struct { yaml_error_type_t error; } context; yaml_mark_t mark = { 0, 0, 0 }; yaml_version_directive_t *version_directive_copy = NULL; struct { yaml_tag_directive_t *start; yaml_tag_directive_t *end; yaml_tag_directive_t *top; } tag_directives_copy = { NULL, NULL, NULL }; yaml_tag_directive_t value = { NULL, NULL }; assert(event); /* Non-NULL event object is expected. */ assert((tag_directives_start && tag_directives_end) || (tag_directives_start == tag_directives_end)); /* Valid tag directives are expected. */ if (version_directive) { version_directive_copy = YAML_MALLOC_STATIC(yaml_version_directive_t); if (!version_directive_copy) goto error; version_directive_copy->major = version_directive->major; version_directive_copy->minor = version_directive->minor; } if (tag_directives_start != tag_directives_end) { yaml_tag_directive_t *tag_directive; if (!STACK_INIT(&context, tag_directives_copy, yaml_tag_directive_t*)) goto error; for (tag_directive = tag_directives_start; tag_directive != tag_directives_end; tag_directive ++) { assert(tag_directive->handle); assert(tag_directive->prefix); if (!yaml_check_utf8(tag_directive->handle, strlen((char *)tag_directive->handle))) goto error; if (!yaml_check_utf8(tag_directive->prefix, strlen((char *)tag_directive->prefix))) goto error; value.handle = yaml_strdup(tag_directive->handle); value.prefix = yaml_strdup(tag_directive->prefix); if (!value.handle || !value.prefix) goto error; if (!PUSH(&context, tag_directives_copy, value)) goto error; value.handle = NULL; value.prefix = NULL; } } DOCUMENT_START_EVENT_INIT(*event, version_directive_copy, tag_directives_copy.start, tag_directives_copy.top, implicit, mark, mark); return 1; error: yaml_free(version_directive_copy); while (!STACK_EMPTY(context, tag_directives_copy)) { yaml_tag_directive_t value = POP(context, tag_directives_copy); yaml_free(value.handle); yaml_free(value.prefix); } STACK_DEL(context, tag_directives_copy); yaml_free(value.handle); yaml_free(value.prefix); return 0; } /* * Create DOCUMENT-END. */ YAML_DECLARE(int) yaml_document_end_event_initialize(yaml_event_t *event, int implicit) { yaml_mark_t mark = { 0, 0, 0 }; assert(event); /* Non-NULL emitter object is expected. */ DOCUMENT_END_EVENT_INIT(*event, implicit, mark, mark); return 1; } /* * Create ALIAS. */ YAML_DECLARE(int) yaml_alias_event_initialize(yaml_event_t *event, const yaml_char_t *anchor) { yaml_mark_t mark = { 0, 0, 0 }; yaml_char_t *anchor_copy = NULL; assert(event); /* Non-NULL event object is expected. */ assert(anchor); /* Non-NULL anchor is expected. */ if (!yaml_check_utf8(anchor, strlen((char *)anchor))) return 0; anchor_copy = yaml_strdup(anchor); if (!anchor_copy) return 0; ALIAS_EVENT_INIT(*event, anchor_copy, mark, mark); return 1; } /* * Create SCALAR. */ YAML_DECLARE(int) yaml_scalar_event_initialize(yaml_event_t *event, const yaml_char_t *anchor, const yaml_char_t *tag, const yaml_char_t *value, int length, int plain_implicit, int quoted_implicit, yaml_scalar_style_t style) { yaml_mark_t mark = { 0, 0, 0 }; yaml_char_t *anchor_copy = NULL; yaml_char_t *tag_copy = NULL; yaml_char_t *value_copy = NULL; assert(event); /* Non-NULL event object is expected. */ assert(value); /* Non-NULL anchor is expected. */ if (anchor) { if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error; anchor_copy = yaml_strdup(anchor); if (!anchor_copy) goto error; } if (tag) { if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; tag_copy = yaml_strdup(tag); if (!tag_copy) goto error; } if (length < 0) { length = strlen((char *)value); } if (!yaml_check_utf8(value, length)) goto error; value_copy = YAML_MALLOC(length+1); if (!value_copy) goto error; memcpy(value_copy, value, length); value_copy[length] = '\0'; SCALAR_EVENT_INIT(*event, anchor_copy, tag_copy, value_copy, length, plain_implicit, quoted_implicit, style, mark, mark); return 1; error: yaml_free(anchor_copy); yaml_free(tag_copy); yaml_free(value_copy); return 0; } /* * Create SEQUENCE-START. */ YAML_DECLARE(int) yaml_sequence_start_event_initialize(yaml_event_t *event, const yaml_char_t *anchor, const yaml_char_t *tag, int implicit, yaml_sequence_style_t style) { yaml_mark_t mark = { 0, 0, 0 }; yaml_char_t *anchor_copy = NULL; yaml_char_t *tag_copy = NULL; assert(event); /* Non-NULL event object is expected. */ if (anchor) { if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error; anchor_copy = yaml_strdup(anchor); if (!anchor_copy) goto error; } if (tag) { if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; tag_copy = yaml_strdup(tag); if (!tag_copy) goto error; } SEQUENCE_START_EVENT_INIT(*event, anchor_copy, tag_copy, implicit, style, mark, mark); return 1; error: yaml_free(anchor_copy); yaml_free(tag_copy); return 0; } /* * Create SEQUENCE-END. */ YAML_DECLARE(int) yaml_sequence_end_event_initialize(yaml_event_t *event) { yaml_mark_t mark = { 0, 0, 0 }; assert(event); /* Non-NULL event object is expected. */ SEQUENCE_END_EVENT_INIT(*event, mark, mark); return 1; } /* * Create MAPPING-START. */ YAML_DECLARE(int) yaml_mapping_start_event_initialize(yaml_event_t *event, const yaml_char_t *anchor, const yaml_char_t *tag, int implicit, yaml_mapping_style_t style) { yaml_mark_t mark = { 0, 0, 0 }; yaml_char_t *anchor_copy = NULL; yaml_char_t *tag_copy = NULL; assert(event); /* Non-NULL event object is expected. */ if (anchor) { if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error; anchor_copy = yaml_strdup(anchor); if (!anchor_copy) goto error; } if (tag) { if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; tag_copy = yaml_strdup(tag); if (!tag_copy) goto error; } MAPPING_START_EVENT_INIT(*event, anchor_copy, tag_copy, implicit, style, mark, mark); return 1; error: yaml_free(anchor_copy); yaml_free(tag_copy); return 0; } /* * Create MAPPING-END. */ YAML_DECLARE(int) yaml_mapping_end_event_initialize(yaml_event_t *event) { yaml_mark_t mark = { 0, 0, 0 }; assert(event); /* Non-NULL event object is expected. */ MAPPING_END_EVENT_INIT(*event, mark, mark); return 1; } /* * Destroy an event object. */ YAML_DECLARE(void) yaml_event_delete(yaml_event_t *event) { yaml_tag_directive_t *tag_directive; assert(event); /* Non-NULL event object expected. */ switch (event->type) { case YAML_DOCUMENT_START_EVENT: yaml_free(event->data.document_start.version_directive); for (tag_directive = event->data.document_start.tag_directives.start; tag_directive != event->data.document_start.tag_directives.end; tag_directive++) { yaml_free(tag_directive->handle); yaml_free(tag_directive->prefix); } yaml_free(event->data.document_start.tag_directives.start); break; case YAML_ALIAS_EVENT: yaml_free(event->data.alias.anchor); break; case YAML_SCALAR_EVENT: yaml_free(event->data.scalar.anchor); yaml_free(event->data.scalar.tag); yaml_free(event->data.scalar.value); break; case YAML_SEQUENCE_START_EVENT: yaml_free(event->data.sequence_start.anchor); yaml_free(event->data.sequence_start.tag); break; case YAML_MAPPING_START_EVENT: yaml_free(event->data.mapping_start.anchor); yaml_free(event->data.mapping_start.tag); break; default: break; } memset(event, 0, sizeof(yaml_event_t)); } /* * Create a document object. */ YAML_DECLARE(int) yaml_document_initialize(yaml_document_t *document, yaml_version_directive_t *version_directive, yaml_tag_directive_t *tag_directives_start, yaml_tag_directive_t *tag_directives_end, int start_implicit, int end_implicit) { struct { yaml_error_type_t error; } context; struct { yaml_node_t *start; yaml_node_t *end; yaml_node_t *top; } nodes = { NULL, NULL, NULL }; yaml_version_directive_t *version_directive_copy = NULL; struct { yaml_tag_directive_t *start; yaml_tag_directive_t *end; yaml_tag_directive_t *top; } tag_directives_copy = { NULL, NULL, NULL }; yaml_tag_directive_t value = { NULL, NULL }; yaml_mark_t mark = { 0, 0, 0 }; assert(document); /* Non-NULL document object is expected. */ assert((tag_directives_start && tag_directives_end) || (tag_directives_start == tag_directives_end)); /* Valid tag directives are expected. */ if (!STACK_INIT(&context, nodes, yaml_node_t*)) goto error; if (version_directive) { version_directive_copy = YAML_MALLOC_STATIC(yaml_version_directive_t); if (!version_directive_copy) goto error; version_directive_copy->major = version_directive->major; version_directive_copy->minor = version_directive->minor; } if (tag_directives_start != tag_directives_end) { yaml_tag_directive_t *tag_directive; if (!STACK_INIT(&context, tag_directives_copy, yaml_tag_directive_t*)) goto error; for (tag_directive = tag_directives_start; tag_directive != tag_directives_end; tag_directive ++) { assert(tag_directive->handle); assert(tag_directive->prefix); if (!yaml_check_utf8(tag_directive->handle, strlen((char *)tag_directive->handle))) goto error; if (!yaml_check_utf8(tag_directive->prefix, strlen((char *)tag_directive->prefix))) goto error; value.handle = yaml_strdup(tag_directive->handle); value.prefix = yaml_strdup(tag_directive->prefix); if (!value.handle || !value.prefix) goto error; if (!PUSH(&context, tag_directives_copy, value)) goto error; value.handle = NULL; value.prefix = NULL; } } DOCUMENT_INIT(*document, nodes.start, nodes.end, version_directive_copy, tag_directives_copy.start, tag_directives_copy.top, start_implicit, end_implicit, mark, mark); return 1; error: STACK_DEL(&context, nodes); yaml_free(version_directive_copy); while (!STACK_EMPTY(&context, tag_directives_copy)) { yaml_tag_directive_t value = POP(&context, tag_directives_copy); yaml_free(value.handle); yaml_free(value.prefix); } STACK_DEL(&context, tag_directives_copy); yaml_free(value.handle); yaml_free(value.prefix); return 0; } /* * Destroy a document object. */ YAML_DECLARE(void) yaml_document_delete(yaml_document_t *document) { yaml_tag_directive_t *tag_directive; assert(document); /* Non-NULL document object is expected. */ while (!STACK_EMPTY(&context, document->nodes)) { yaml_node_t node = POP(&context, document->nodes); yaml_free(node.tag); switch (node.type) { case YAML_SCALAR_NODE: yaml_free(node.data.scalar.value); break; case YAML_SEQUENCE_NODE: STACK_DEL(&context, node.data.sequence.items); break; case YAML_MAPPING_NODE: STACK_DEL(&context, node.data.mapping.pairs); break; default: assert(0); /* Should not happen. */ } } STACK_DEL(&context, document->nodes); yaml_free(document->version_directive); for (tag_directive = document->tag_directives.start; tag_directive != document->tag_directives.end; tag_directive++) { yaml_free(tag_directive->handle); yaml_free(tag_directive->prefix); } yaml_free(document->tag_directives.start); memset(document, 0, sizeof(yaml_document_t)); } /** * Get a document node. */ YAML_DECLARE(yaml_node_t *) yaml_document_get_node(yaml_document_t *document, int index) { assert(document); /* Non-NULL document object is expected. */ if (index > 0 && document->nodes.start + index <= document->nodes.top) { return document->nodes.start + index - 1; } return NULL; } /** * Get the root object. */ YAML_DECLARE(yaml_node_t *) yaml_document_get_root_node(yaml_document_t *document) { assert(document); /* Non-NULL document object is expected. */ if (document->nodes.top != document->nodes.start) { return document->nodes.start; } return NULL; } /* * Add a scalar node to a document. */ YAML_DECLARE(int) yaml_document_add_scalar(yaml_document_t *document, const yaml_char_t *tag, const yaml_char_t *value, int length, yaml_scalar_style_t style) { struct { yaml_error_type_t error; } context; yaml_mark_t mark = { 0, 0, 0 }; yaml_char_t *tag_copy = NULL; yaml_char_t *value_copy = NULL; yaml_node_t node; assert(document); /* Non-NULL document object is expected. */ assert(value); /* Non-NULL value is expected. */ if (!tag) { tag = (yaml_char_t *)YAML_DEFAULT_SCALAR_TAG; } if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; tag_copy = yaml_strdup(tag); if (!tag_copy) goto error; if (length < 0) { length = strlen((char *)value); } if (!yaml_check_utf8(value, length)) goto error; value_copy = YAML_MALLOC(length+1); if (!value_copy) goto error; memcpy(value_copy, value, length); value_copy[length] = '\0'; SCALAR_NODE_INIT(node, tag_copy, value_copy, length, style, mark, mark); if (!PUSH(&context, document->nodes, node)) goto error; return document->nodes.top - document->nodes.start; error: yaml_free(tag_copy); yaml_free(value_copy); return 0; } /* * Add a sequence node to a document. */ YAML_DECLARE(int) yaml_document_add_sequence(yaml_document_t *document, const yaml_char_t *tag, yaml_sequence_style_t style) { struct { yaml_error_type_t error; } context; yaml_mark_t mark = { 0, 0, 0 }; yaml_char_t *tag_copy = NULL; struct { yaml_node_item_t *start; yaml_node_item_t *end; yaml_node_item_t *top; } items = { NULL, NULL, NULL }; yaml_node_t node; assert(document); /* Non-NULL document object is expected. */ if (!tag) { tag = (yaml_char_t *)YAML_DEFAULT_SEQUENCE_TAG; } if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; tag_copy = yaml_strdup(tag); if (!tag_copy) goto error; if (!STACK_INIT(&context, items, yaml_node_item_t*)) goto error; SEQUENCE_NODE_INIT(node, tag_copy, items.start, items.end, style, mark, mark); if (!PUSH(&context, document->nodes, node)) goto error; return document->nodes.top - document->nodes.start; error: STACK_DEL(&context, items); yaml_free(tag_copy); return 0; } /* * Add a mapping node to a document. */ YAML_DECLARE(int) yaml_document_add_mapping(yaml_document_t *document, const yaml_char_t *tag, yaml_mapping_style_t style) { struct { yaml_error_type_t error; } context; yaml_mark_t mark = { 0, 0, 0 }; yaml_char_t *tag_copy = NULL; struct { yaml_node_pair_t *start; yaml_node_pair_t *end; yaml_node_pair_t *top; } pairs = { NULL, NULL, NULL }; yaml_node_t node; assert(document); /* Non-NULL document object is expected. */ if (!tag) { tag = (yaml_char_t *)YAML_DEFAULT_MAPPING_TAG; } if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; tag_copy = yaml_strdup(tag); if (!tag_copy) goto error; if (!STACK_INIT(&context, pairs, yaml_node_pair_t*)) goto error; MAPPING_NODE_INIT(node, tag_copy, pairs.start, pairs.end, style, mark, mark); if (!PUSH(&context, document->nodes, node)) goto error; return document->nodes.top - document->nodes.start; error: STACK_DEL(&context, pairs); yaml_free(tag_copy); return 0; } /* * Append an item to a sequence node. */ YAML_DECLARE(int) yaml_document_append_sequence_item(yaml_document_t *document, int sequence, int item) { struct { yaml_error_type_t error; } context; assert(document); /* Non-NULL document is required. */ assert(sequence > 0 && document->nodes.start + sequence <= document->nodes.top); /* Valid sequence id is required. */ assert(document->nodes.start[sequence-1].type == YAML_SEQUENCE_NODE); /* A sequence node is required. */ assert(item > 0 && document->nodes.start + item <= document->nodes.top); /* Valid item id is required. */ if (!PUSH(&context, document->nodes.start[sequence-1].data.sequence.items, item)) return 0; return 1; } /* * Append a pair of a key and a value to a mapping node. */ YAML_DECLARE(int) yaml_document_append_mapping_pair(yaml_document_t *document, int mapping, int key, int value) { struct { yaml_error_type_t error; } context; yaml_node_pair_t pair; assert(document); /* Non-NULL document is required. */ assert(mapping > 0 && document->nodes.start + mapping <= document->nodes.top); /* Valid mapping id is required. */ assert(document->nodes.start[mapping-1].type == YAML_MAPPING_NODE); /* A mapping node is required. */ assert(key > 0 && document->nodes.start + key <= document->nodes.top); /* Valid key id is required. */ assert(value > 0 && document->nodes.start + value <= document->nodes.top); /* Valid value id is required. */ pair.key = key; pair.value = value; if (!PUSH(&context, document->nodes.start[mapping-1].data.mapping.pairs, pair)) return 0; return 1; } /* * API functions. */ YAML_DECLARE(int) yaml_emitter_open(yaml_emitter_t *emitter); YAML_DECLARE(int) yaml_emitter_close(yaml_emitter_t *emitter); YAML_DECLARE(int) yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document); /* * Clean up functions. */ static void yaml_emitter_delete_document_and_anchors(yaml_emitter_t *emitter); /* * Anchor functions. */ static void yaml_emitter_anchor_node(yaml_emitter_t *emitter, int index); static yaml_char_t * yaml_emitter_generate_anchor(yaml_emitter_t *emitter, int anchor_id); /* * Serialize functions. */ static int yaml_emitter_dump_node(yaml_emitter_t *emitter, int index); static int yaml_emitter_dump_alias(yaml_emitter_t *emitter, yaml_char_t *anchor); static int yaml_emitter_dump_scalar(yaml_emitter_t *emitter, yaml_node_t *node, yaml_char_t *anchor); static int yaml_emitter_dump_sequence(yaml_emitter_t *emitter, yaml_node_t *node, yaml_char_t *anchor); static int yaml_emitter_dump_mapping(yaml_emitter_t *emitter, yaml_node_t *node, yaml_char_t *anchor); /* * Issue a STREAM-START event. */ YAML_DECLARE(int) yaml_emitter_open(yaml_emitter_t *emitter) { yaml_event_t event; yaml_mark_t mark = { 0, 0, 0 }; assert(emitter); /* Non-NULL emitter object is required. */ assert(!emitter->opened); /* Emitter should not be opened yet. */ STREAM_START_EVENT_INIT(event, YAML_ANY_ENCODING, mark, mark); if (!yaml_emitter_emit(emitter, &event)) { return 0; } emitter->opened = 1; return 1; } /* * Issue a STREAM-END event. */ YAML_DECLARE(int) yaml_emitter_close(yaml_emitter_t *emitter) { yaml_event_t event; yaml_mark_t mark = { 0, 0, 0 }; assert(emitter); /* Non-NULL emitter object is required. */ assert(emitter->opened); /* Emitter should be opened. */ if (emitter->closed) return 1; STREAM_END_EVENT_INIT(event, mark, mark); if (!yaml_emitter_emit(emitter, &event)) { return 0; } emitter->closed = 1; return 1; } /* * Dump a YAML document. */ YAML_DECLARE(int) yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document) { yaml_event_t event; yaml_mark_t mark = { 0, 0, 0 }; assert(emitter); /* Non-NULL emitter object is required. */ assert(document); /* Non-NULL emitter object is expected. */ emitter->document = document; if (!emitter->opened) { if (!yaml_emitter_open(emitter)) goto error; } if (STACK_EMPTY(emitter, document->nodes)) { if (!yaml_emitter_close(emitter)) goto error; yaml_emitter_delete_document_and_anchors(emitter); return 1; } assert(emitter->opened); /* Emitter should be opened. */ emitter->anchors = (yaml_anchors_t*)yaml_malloc(sizeof(*(emitter->anchors)) * (document->nodes.top - document->nodes.start)); if (!emitter->anchors) goto error; memset(emitter->anchors, 0, sizeof(*(emitter->anchors)) * (document->nodes.top - document->nodes.start)); DOCUMENT_START_EVENT_INIT(event, document->version_directive, document->tag_directives.start, document->tag_directives.end, document->start_implicit, mark, mark); if (!yaml_emitter_emit(emitter, &event)) goto error; yaml_emitter_anchor_node(emitter, 1); if (!yaml_emitter_dump_node(emitter, 1)) goto error; DOCUMENT_END_EVENT_INIT(event, document->end_implicit, mark, mark); if (!yaml_emitter_emit(emitter, &event)) goto error; yaml_emitter_delete_document_and_anchors(emitter); return 1; error: yaml_emitter_delete_document_and_anchors(emitter); return 0; } /* * Clean up the emitter object after a document is dumped. */ static void yaml_emitter_delete_document_and_anchors(yaml_emitter_t *emitter) { int index; if (!emitter->anchors) { yaml_document_delete(emitter->document); emitter->document = NULL; return; } for (index = 0; emitter->document->nodes.start + index < emitter->document->nodes.top; index ++) { yaml_node_t node = emitter->document->nodes.start[index]; if (!emitter->anchors[index].serialized) { yaml_free(node.tag); if (node.type == YAML_SCALAR_NODE) { yaml_free(node.data.scalar.value); } } if (node.type == YAML_SEQUENCE_NODE) { STACK_DEL(emitter, node.data.sequence.items); } if (node.type == YAML_MAPPING_NODE) { STACK_DEL(emitter, node.data.mapping.pairs); } } STACK_DEL(emitter, emitter->document->nodes); yaml_free(emitter->anchors); emitter->anchors = NULL; emitter->last_anchor_id = 0; emitter->document = NULL; } /* * Check the references of a node and assign the anchor id if needed. */ static void yaml_emitter_anchor_node(yaml_emitter_t *emitter, int index) { yaml_node_t *node = emitter->document->nodes.start + index - 1; yaml_node_item_t *item; yaml_node_pair_t *pair; emitter->anchors[index-1].references ++; if (emitter->anchors[index-1].references == 1) { switch (node->type) { case YAML_SEQUENCE_NODE: for (item = node->data.sequence.items.start; item < node->data.sequence.items.top; item ++) { yaml_emitter_anchor_node(emitter, *item); } break; case YAML_MAPPING_NODE: for (pair = node->data.mapping.pairs.start; pair < node->data.mapping.pairs.top; pair ++) { yaml_emitter_anchor_node(emitter, pair->key); yaml_emitter_anchor_node(emitter, pair->value); } break; default: break; } } else if (emitter->anchors[index-1].references == 2) { emitter->anchors[index-1].anchor = (++ emitter->last_anchor_id); } } /* * Generate a textual representation for an anchor. */ #define ANCHOR_TEMPLATE "id%03d" #define ANCHOR_TEMPLATE_LENGTH 16 static yaml_char_t * yaml_emitter_generate_anchor(SHIM(yaml_emitter_t *emitter), int anchor_id) { yaml_char_t *anchor = YAML_MALLOC(ANCHOR_TEMPLATE_LENGTH); if (!anchor) return NULL; sprintf((char *)anchor, ANCHOR_TEMPLATE, anchor_id); return anchor; } /* * Serialize a node. */ static int yaml_emitter_dump_node(yaml_emitter_t *emitter, int index) { yaml_node_t *node = emitter->document->nodes.start + index - 1; int anchor_id = emitter->anchors[index-1].anchor; yaml_char_t *anchor = NULL; if (anchor_id) { anchor = yaml_emitter_generate_anchor(emitter, anchor_id); if (!anchor) return 0; } if (emitter->anchors[index-1].serialized) { return yaml_emitter_dump_alias(emitter, anchor); } emitter->anchors[index-1].serialized = 1; switch (node->type) { case YAML_SCALAR_NODE: return yaml_emitter_dump_scalar(emitter, node, anchor); case YAML_SEQUENCE_NODE: return yaml_emitter_dump_sequence(emitter, node, anchor); case YAML_MAPPING_NODE: return yaml_emitter_dump_mapping(emitter, node, anchor); default: assert(0); /* Could not happen. */ break; } return 0; /* Could not happen. */ } /* * Serialize an alias. */ static int yaml_emitter_dump_alias(yaml_emitter_t *emitter, yaml_char_t *anchor) { yaml_event_t event; yaml_mark_t mark = { 0, 0, 0 }; ALIAS_EVENT_INIT(event, anchor, mark, mark); return yaml_emitter_emit(emitter, &event); } /* * Serialize a scalar. */ static int yaml_emitter_dump_scalar(yaml_emitter_t *emitter, yaml_node_t *node, yaml_char_t *anchor) { yaml_event_t event; yaml_mark_t mark = { 0, 0, 0 }; int plain_implicit = (strcmp((char *)node->tag, YAML_DEFAULT_SCALAR_TAG) == 0); int quoted_implicit = (strcmp((char *)node->tag, YAML_DEFAULT_SCALAR_TAG) == 0); SCALAR_EVENT_INIT(event, anchor, node->tag, node->data.scalar.value, node->data.scalar.length, plain_implicit, quoted_implicit, node->data.scalar.style, mark, mark); return yaml_emitter_emit(emitter, &event); } /* * Serialize a sequence. */ static int yaml_emitter_dump_sequence(yaml_emitter_t *emitter, yaml_node_t *node, yaml_char_t *anchor) { yaml_event_t event; yaml_mark_t mark = { 0, 0, 0 }; int implicit = (strcmp((char *)node->tag, YAML_DEFAULT_SEQUENCE_TAG) == 0); yaml_node_item_t *item; SEQUENCE_START_EVENT_INIT(event, anchor, node->tag, implicit, node->data.sequence.style, mark, mark); if (!yaml_emitter_emit(emitter, &event)) return 0; for (item = node->data.sequence.items.start; item < node->data.sequence.items.top; item ++) { if (!yaml_emitter_dump_node(emitter, *item)) return 0; } SEQUENCE_END_EVENT_INIT(event, mark, mark); if (!yaml_emitter_emit(emitter, &event)) return 0; return 1; } /* * Serialize a mapping. */ static int yaml_emitter_dump_mapping(yaml_emitter_t *emitter, yaml_node_t *node, yaml_char_t *anchor) { yaml_event_t event; yaml_mark_t mark = { 0, 0, 0 }; int implicit = (strcmp((char *)node->tag, YAML_DEFAULT_MAPPING_TAG) == 0); yaml_node_pair_t *pair; MAPPING_START_EVENT_INIT(event, anchor, node->tag, implicit, node->data.mapping.style, mark, mark); if (!yaml_emitter_emit(emitter, &event)) return 0; for (pair = node->data.mapping.pairs.start; pair < node->data.mapping.pairs.top; pair ++) { if (!yaml_emitter_dump_node(emitter, pair->key)) return 0; if (!yaml_emitter_dump_node(emitter, pair->value)) return 0; } MAPPING_END_EVENT_INIT(event, mark, mark); if (!yaml_emitter_emit(emitter, &event)) return 0; return 1; } /* * Flush the buffer if needed. */ #define FLUSH(emitter) \ ((emitter->buffer.pointer+5 < emitter->buffer.end) \ || yaml_emitter_flush(emitter)) /* * Put a character to the output buffer. */ #define PUT(emitter,value) \ (FLUSH(emitter) \ && (*(emitter->buffer.pointer++) = (yaml_char_t)(value), \ emitter->column++, \ 1)) /* * Put a line break to the output buffer. */ #define PUT_BREAK(emitter) \ (FLUSH(emitter) \ && ((emitter->line_break == YAML_CR_BREAK ? \ (*(emitter->buffer.pointer++) = (yaml_char_t) '\r') : \ emitter->line_break == YAML_LN_BREAK ? \ (*(emitter->buffer.pointer++) = (yaml_char_t) '\n') : \ emitter->line_break == YAML_CRLN_BREAK ? \ (*(emitter->buffer.pointer++) = (yaml_char_t) '\r', \ *(emitter->buffer.pointer++) = (yaml_char_t) '\n') : 0), \ emitter->column = 0, \ emitter->line ++, \ 1)) /* * Copy a character from a string into buffer. */ #define WRITE(emitter,string) \ (FLUSH(emitter) \ && (COPY(emitter->buffer,string), \ emitter->column ++, \ 1)) /* * Copy a line break character from a string into buffer. */ #define WRITE_BREAK(emitter,string) \ (FLUSH(emitter) \ && (CHECK(string,'\n') ? \ (PUT_BREAK(emitter), \ string.pointer ++, \ 1) : \ (COPY(emitter->buffer,string), \ emitter->column = 0, \ emitter->line ++, \ 1))) /* * API functions. */ YAML_DECLARE(int) yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event); /* * Utility functions. */ static int yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem); static int yaml_emitter_need_more_events(yaml_emitter_t *emitter); static int yaml_emitter_append_tag_directive(yaml_emitter_t *emitter, yaml_tag_directive_t value, int allow_duplicates); static int yaml_emitter_increase_indent(yaml_emitter_t *emitter, int flow, int indentless); /* * State functions. */ static int yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event); static int yaml_emitter_emit_stream_start(yaml_emitter_t *emitter, yaml_event_t *event); static int yaml_emitter_emit_document_start(yaml_emitter_t *emitter, yaml_event_t *event, int first); static int yaml_emitter_emit_document_content(yaml_emitter_t *emitter, yaml_event_t *event); static int yaml_emitter_emit_document_end(yaml_emitter_t *emitter, yaml_event_t *event); static int yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter, yaml_event_t *event, int first); static int yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter, yaml_event_t *event, int first); static int yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter, yaml_event_t *event, int simple); static int yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter, yaml_event_t *event, int first); static int yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter, yaml_event_t *event, int first); static int yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter, yaml_event_t *event, int simple); static int yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event, int root, int sequence, int mapping, int simple_key); static int yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event); static int yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event); static int yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event); static int yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event); /* * Checkers. */ static int yaml_emitter_check_empty_document(yaml_emitter_t *emitter); static int yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter); static int yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter); static int yaml_emitter_check_simple_key(yaml_emitter_t *emitter); static int yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event); /* * Processors. */ static int yaml_emitter_process_anchor(yaml_emitter_t *emitter); static int yaml_emitter_process_tag(yaml_emitter_t *emitter); static int yaml_emitter_process_scalar(yaml_emitter_t *emitter); /* * Analyzers. */ static int yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter, yaml_version_directive_t version_directive); static int yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter, yaml_tag_directive_t tag_directive); static int yaml_emitter_analyze_anchor(yaml_emitter_t *emitter, yaml_char_t *anchor, int alias); static int yaml_emitter_analyze_tag(yaml_emitter_t *emitter, yaml_char_t *tag); static int yaml_emitter_analyze_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length); static int yaml_emitter_analyze_event(yaml_emitter_t *emitter, yaml_event_t *event); /* * Writers. */ static int yaml_emitter_write_bom(yaml_emitter_t *emitter); static int yaml_emitter_write_indent(yaml_emitter_t *emitter); static int yaml_emitter_write_indicator(yaml_emitter_t *emitter, const char *indicator, int need_whitespace, int is_whitespace, int is_indention); static int yaml_emitter_write_anchor(yaml_emitter_t *emitter, yaml_char_t *value, size_t length); static int yaml_emitter_write_tag_handle(yaml_emitter_t *emitter, yaml_char_t *value, size_t length); static int yaml_emitter_write_tag_content(yaml_emitter_t *emitter, yaml_char_t *value, size_t length, int need_whitespace); static int yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length, int allow_breaks); static int yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length, int allow_breaks); static int yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length, int allow_breaks); static int yaml_emitter_write_block_scalar_hints(yaml_emitter_t *emitter, yaml_string_t string); static int yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length); static int yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length); /* * Set an emitter error and return 0. */ static int yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem) { emitter->error = YAML_EMITTER_ERROR; emitter->problem = problem; return 0; } /* * Emit an event. */ YAML_DECLARE(int) yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event) { if (!ENQUEUE(emitter, emitter->events, *event)) { yaml_event_delete(event); return 0; } while (!yaml_emitter_need_more_events(emitter)) { if (!yaml_emitter_analyze_event(emitter, emitter->events.head)) return 0; if (!yaml_emitter_state_machine(emitter, emitter->events.head)) return 0; yaml_event_delete(&DEQUEUE(emitter, emitter->events)); } return 1; } /* * Check if we need to accumulate more events before emitting. * * We accumulate extra * - 1 event for DOCUMENT-START * - 2 events for SEQUENCE-START * - 3 events for MAPPING-START */ static int yaml_emitter_need_more_events(yaml_emitter_t *emitter) { int level = 0; int accumulate = 0; yaml_event_t *event; if (QUEUE_EMPTY(emitter, emitter->events)) return 1; switch (emitter->events.head->type) { case YAML_DOCUMENT_START_EVENT: accumulate = 1; break; case YAML_SEQUENCE_START_EVENT: accumulate = 2; break; case YAML_MAPPING_START_EVENT: accumulate = 3; break; default: return 0; } if (emitter->events.tail - emitter->events.head > accumulate) return 0; for (event = emitter->events.head; event != emitter->events.tail; event ++) { switch (event->type) { case YAML_STREAM_START_EVENT: case YAML_DOCUMENT_START_EVENT: case YAML_SEQUENCE_START_EVENT: case YAML_MAPPING_START_EVENT: level += 1; break; case YAML_STREAM_END_EVENT: case YAML_DOCUMENT_END_EVENT: case YAML_SEQUENCE_END_EVENT: case YAML_MAPPING_END_EVENT: level -= 1; break; default: break; } if (!level) return 0; } return 1; } /* * Append a directive to the directives stack. */ static int yaml_emitter_append_tag_directive(yaml_emitter_t *emitter, yaml_tag_directive_t value, int allow_duplicates) { yaml_tag_directive_t *tag_directive; yaml_tag_directive_t copy = { NULL, NULL }; for (tag_directive = emitter->tag_directives.start; tag_directive != emitter->tag_directives.top; tag_directive ++) { if (strcmp((char *)value.handle, (char *)tag_directive->handle) == 0) { if (allow_duplicates) return 1; return yaml_emitter_set_emitter_error(emitter, "duplicate %TAG directive"); } } copy.handle = yaml_strdup(value.handle); copy.prefix = yaml_strdup(value.prefix); if (!copy.handle || !copy.prefix) { emitter->error = YAML_MEMORY_ERROR; goto error; } if (!PUSH(emitter, emitter->tag_directives, copy)) goto error; return 1; error: yaml_free(copy.handle); yaml_free(copy.prefix); return 0; } /* * Increase the indentation level. */ static int yaml_emitter_increase_indent(yaml_emitter_t *emitter, int flow, int indentless) { if (!PUSH(emitter, emitter->indents, emitter->indent)) return 0; if (emitter->indent < 0) { emitter->indent = flow ? emitter->best_indent : 0; } else if (!indentless) { emitter->indent += emitter->best_indent; } return 1; } /* * State dispatcher. */ static int yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event) { switch (emitter->state) { case YAML_EMIT_STREAM_START_STATE: return yaml_emitter_emit_stream_start(emitter, event); case YAML_EMIT_FIRST_DOCUMENT_START_STATE: return yaml_emitter_emit_document_start(emitter, event, 1); case YAML_EMIT_DOCUMENT_START_STATE: return yaml_emitter_emit_document_start(emitter, event, 0); case YAML_EMIT_DOCUMENT_CONTENT_STATE: return yaml_emitter_emit_document_content(emitter, event); case YAML_EMIT_DOCUMENT_END_STATE: return yaml_emitter_emit_document_end(emitter, event); case YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE: return yaml_emitter_emit_flow_sequence_item(emitter, event, 1); case YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE: return yaml_emitter_emit_flow_sequence_item(emitter, event, 0); case YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE: return yaml_emitter_emit_flow_mapping_key(emitter, event, 1); case YAML_EMIT_FLOW_MAPPING_KEY_STATE: return yaml_emitter_emit_flow_mapping_key(emitter, event, 0); case YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE: return yaml_emitter_emit_flow_mapping_value(emitter, event, 1); case YAML_EMIT_FLOW_MAPPING_VALUE_STATE: return yaml_emitter_emit_flow_mapping_value(emitter, event, 0); case YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE: return yaml_emitter_emit_block_sequence_item(emitter, event, 1); case YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE: return yaml_emitter_emit_block_sequence_item(emitter, event, 0); case YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE: return yaml_emitter_emit_block_mapping_key(emitter, event, 1); case YAML_EMIT_BLOCK_MAPPING_KEY_STATE: return yaml_emitter_emit_block_mapping_key(emitter, event, 0); case YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE: return yaml_emitter_emit_block_mapping_value(emitter, event, 1); case YAML_EMIT_BLOCK_MAPPING_VALUE_STATE: return yaml_emitter_emit_block_mapping_value(emitter, event, 0); case YAML_EMIT_END_STATE: return yaml_emitter_set_emitter_error(emitter, "expected nothing after STREAM-END"); default: assert(1); /* Invalid state. */ } return 0; } /* * Expect STREAM-START. */ static int yaml_emitter_emit_stream_start(yaml_emitter_t *emitter, yaml_event_t *event) { emitter->open_ended = 0; if (event->type == YAML_STREAM_START_EVENT) { if (!emitter->encoding) { emitter->encoding = event->data.stream_start.encoding; } if (!emitter->encoding) { emitter->encoding = YAML_UTF8_ENCODING; } if (emitter->best_indent < 2 || emitter->best_indent > 9) { emitter->best_indent = 2; } if (emitter->best_width >= 0 && emitter->best_width <= emitter->best_indent*2) { emitter->best_width = 80; } if (emitter->best_width < 0) { emitter->best_width = INT_MAX; } if (!emitter->line_break) { emitter->line_break = YAML_LN_BREAK; } emitter->indent = -1; emitter->line = 0; emitter->column = 0; emitter->whitespace = 1; emitter->indention = 1; if (emitter->encoding != YAML_UTF8_ENCODING) { if (!yaml_emitter_write_bom(emitter)) return 0; } emitter->state = YAML_EMIT_FIRST_DOCUMENT_START_STATE; return 1; } return yaml_emitter_set_emitter_error(emitter, "expected STREAM-START"); } /* * Expect DOCUMENT-START or STREAM-END. */ static int yaml_emitter_emit_document_start(yaml_emitter_t *emitter, yaml_event_t *event, int first) { if (event->type == YAML_DOCUMENT_START_EVENT) { yaml_tag_directive_t default_tag_directives[] = { {(yaml_char_t *)"!", (yaml_char_t *)"!"}, {(yaml_char_t *)"!!", (yaml_char_t *)"tag:yaml.org,2002:"}, {NULL, NULL} }; yaml_tag_directive_t *tag_directive; int implicit; if (event->data.document_start.version_directive) { if (!yaml_emitter_analyze_version_directive(emitter, *event->data.document_start.version_directive)) return 0; } for (tag_directive = event->data.document_start.tag_directives.start; tag_directive != event->data.document_start.tag_directives.end; tag_directive ++) { if (!yaml_emitter_analyze_tag_directive(emitter, *tag_directive)) return 0; if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 0)) return 0; } for (tag_directive = default_tag_directives; tag_directive->handle; tag_directive ++) { if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 1)) return 0; } implicit = event->data.document_start.implicit; if (!first || emitter->canonical) { implicit = 0; } if ((event->data.document_start.version_directive || (event->data.document_start.tag_directives.start != event->data.document_start.tag_directives.end)) && emitter->open_ended) { if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0)) return 0; if (!yaml_emitter_write_indent(emitter)) return 0; } emitter->open_ended = 0; if (event->data.document_start.version_directive) { implicit = 0; if (!yaml_emitter_write_indicator(emitter, "%YAML", 1, 0, 0)) return 0; if (event->data.document_start.version_directive->minor == 1) { if (!yaml_emitter_write_indicator(emitter, "1.1", 1, 0, 0)) return 0; } else { if (!yaml_emitter_write_indicator(emitter, "1.2", 1, 0, 0)) return 0; } if (!yaml_emitter_write_indent(emitter)) return 0; } if (event->data.document_start.tag_directives.start != event->data.document_start.tag_directives.end) { implicit = 0; for (tag_directive = event->data.document_start.tag_directives.start; tag_directive != event->data.document_start.tag_directives.end; tag_directive ++) { if (!yaml_emitter_write_indicator(emitter, "%TAG", 1, 0, 0)) return 0; if (!yaml_emitter_write_tag_handle(emitter, tag_directive->handle, strlen((char *)tag_directive->handle))) return 0; if (!yaml_emitter_write_tag_content(emitter, tag_directive->prefix, strlen((char *)tag_directive->prefix), 1)) return 0; if (!yaml_emitter_write_indent(emitter)) return 0; } } if (yaml_emitter_check_empty_document(emitter)) { implicit = 0; } if (!implicit) { if (!yaml_emitter_write_indent(emitter)) return 0; if (!yaml_emitter_write_indicator(emitter, "---", 1, 0, 0)) return 0; if (emitter->canonical) { if (!yaml_emitter_write_indent(emitter)) return 0; } } emitter->state = YAML_EMIT_DOCUMENT_CONTENT_STATE; emitter->open_ended = 0; return 1; } else if (event->type == YAML_STREAM_END_EVENT) { /** * This can happen if a block scalar with trailing empty lines * is at the end of the stream */ if (emitter->open_ended == 2) { if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0)) return 0; emitter->open_ended = 0; if (!yaml_emitter_write_indent(emitter)) return 0; } if (!yaml_emitter_flush(emitter)) return 0; emitter->state = YAML_EMIT_END_STATE; return 1; } return yaml_emitter_set_emitter_error(emitter, "expected DOCUMENT-START or STREAM-END"); } /* * Expect the root node. */ static int yaml_emitter_emit_document_content(yaml_emitter_t *emitter, yaml_event_t *event) { if (!PUSH(emitter, emitter->states, YAML_EMIT_DOCUMENT_END_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 1, 0, 0, 0); } /* * Expect DOCUMENT-END. */ static int yaml_emitter_emit_document_end(yaml_emitter_t *emitter, yaml_event_t *event) { if (event->type == YAML_DOCUMENT_END_EVENT) { if (!yaml_emitter_write_indent(emitter)) return 0; if (!event->data.document_end.implicit) { if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0)) return 0; emitter->open_ended = 0; if (!yaml_emitter_write_indent(emitter)) return 0; } else if (!emitter->open_ended) emitter->open_ended = 1; if (!yaml_emitter_flush(emitter)) return 0; emitter->state = YAML_EMIT_DOCUMENT_START_STATE; while (!STACK_EMPTY(emitter, emitter->tag_directives)) { yaml_tag_directive_t tag_directive = POP(emitter, emitter->tag_directives); yaml_free(tag_directive.handle); yaml_free(tag_directive.prefix); } return 1; } return yaml_emitter_set_emitter_error(emitter, "expected DOCUMENT-END"); } /* * * Expect a flow item node. */ static int yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter, yaml_event_t *event, int first) { if (first) { if (!yaml_emitter_write_indicator(emitter, "[", 1, 1, 0)) return 0; if (!yaml_emitter_increase_indent(emitter, 1, 0)) return 0; emitter->flow_level ++; } if (event->type == YAML_SEQUENCE_END_EVENT) { emitter->flow_level --; emitter->indent = POP(emitter, emitter->indents); if (emitter->canonical && !first) { if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0)) return 0; if (!yaml_emitter_write_indent(emitter)) return 0; } if (!yaml_emitter_write_indicator(emitter, "]", 0, 0, 0)) return 0; emitter->state = POP(emitter, emitter->states); return 1; } if (!first) { if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0)) return 0; } if (emitter->canonical || emitter->column > emitter->best_width) { if (!yaml_emitter_write_indent(emitter)) return 0; } if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0); } /* * Expect a flow key node. */ static int yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter, yaml_event_t *event, int first) { if (first) { if (!yaml_emitter_write_indicator(emitter, "{", 1, 1, 0)) return 0; if (!yaml_emitter_increase_indent(emitter, 1, 0)) return 0; emitter->flow_level ++; } if (event->type == YAML_MAPPING_END_EVENT) { emitter->flow_level --; emitter->indent = POP(emitter, emitter->indents); if (emitter->canonical && !first) { if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0)) return 0; if (!yaml_emitter_write_indent(emitter)) return 0; } if (!yaml_emitter_write_indicator(emitter, "}", 0, 0, 0)) return 0; emitter->state = POP(emitter, emitter->states); return 1; } if (!first) { if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0)) return 0; } if (emitter->canonical || emitter->column > emitter->best_width) { if (!yaml_emitter_write_indent(emitter)) return 0; } if (!emitter->canonical && yaml_emitter_check_simple_key(emitter)) { if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1); } else { if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 0)) return 0; if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_MAPPING_VALUE_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); } } /* * Expect a flow value node. */ static int yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter, yaml_event_t *event, int simple) { if (simple) { if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0)) return 0; } else { if (emitter->canonical || emitter->column > emitter->best_width) { if (!yaml_emitter_write_indent(emitter)) return 0; } if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 0)) return 0; } if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_MAPPING_KEY_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); } /* * Expect a block item node. */ static int yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter, yaml_event_t *event, int first) { if (first) { if (!yaml_emitter_increase_indent(emitter, 0, (emitter->mapping_context && !emitter->indention))) return 0; } if (event->type == YAML_SEQUENCE_END_EVENT) { emitter->indent = POP(emitter, emitter->indents); emitter->state = POP(emitter, emitter->states); return 1; } if (!yaml_emitter_write_indent(emitter)) return 0; if (!yaml_emitter_write_indicator(emitter, "-", 1, 0, 1)) return 0; if (!PUSH(emitter, emitter->states, YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0); } /* * Expect a block key node. */ static int yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter, yaml_event_t *event, int first) { if (first) { if (!yaml_emitter_increase_indent(emitter, 0, 0)) return 0; } if (event->type == YAML_MAPPING_END_EVENT) { emitter->indent = POP(emitter, emitter->indents); emitter->state = POP(emitter, emitter->states); return 1; } if (!yaml_emitter_write_indent(emitter)) return 0; if (yaml_emitter_check_simple_key(emitter)) { if (!PUSH(emitter, emitter->states, YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1); } else { if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 1)) return 0; if (!PUSH(emitter, emitter->states, YAML_EMIT_BLOCK_MAPPING_VALUE_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); } } /* * Expect a block value node. */ static int yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter, yaml_event_t *event, int simple) { if (simple) { if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0)) return 0; } else { if (!yaml_emitter_write_indent(emitter)) return 0; if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 1)) return 0; } if (!PUSH(emitter, emitter->states, YAML_EMIT_BLOCK_MAPPING_KEY_STATE)) return 0; return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); } /* * Expect a node. */ static int yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event, int root, int sequence, int mapping, int simple_key) { emitter->root_context = root; emitter->sequence_context = sequence; emitter->mapping_context = mapping; emitter->simple_key_context = simple_key; switch (event->type) { case YAML_ALIAS_EVENT: return yaml_emitter_emit_alias(emitter, event); case YAML_SCALAR_EVENT: return yaml_emitter_emit_scalar(emitter, event); case YAML_SEQUENCE_START_EVENT: return yaml_emitter_emit_sequence_start(emitter, event); case YAML_MAPPING_START_EVENT: return yaml_emitter_emit_mapping_start(emitter, event); default: return yaml_emitter_set_emitter_error(emitter, "expected SCALAR, SEQUENCE-START, MAPPING-START, or ALIAS"); } return 0; } /* * Expect ALIAS. */ static int yaml_emitter_emit_alias(yaml_emitter_t *emitter, SHIM(yaml_event_t *event)) { if (!yaml_emitter_process_anchor(emitter)) return 0; if (emitter->simple_key_context) if (!PUT(emitter, ' ')) return 0; emitter->state = POP(emitter, emitter->states); return 1; } /* * Expect SCALAR. */ static int yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event) { if (!yaml_emitter_select_scalar_style(emitter, event)) return 0; if (!yaml_emitter_process_anchor(emitter)) return 0; if (!yaml_emitter_process_tag(emitter)) return 0; if (!yaml_emitter_increase_indent(emitter, 1, 0)) return 0; if (!yaml_emitter_process_scalar(emitter)) return 0; emitter->indent = POP(emitter, emitter->indents); emitter->state = POP(emitter, emitter->states); return 1; } /* * Expect SEQUENCE-START. */ static int yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event) { if (!yaml_emitter_process_anchor(emitter)) return 0; if (!yaml_emitter_process_tag(emitter)) return 0; if (emitter->flow_level || emitter->canonical || event->data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE || yaml_emitter_check_empty_sequence(emitter)) { emitter->state = YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE; } else { emitter->state = YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE; } return 1; } /* * Expect MAPPING-START. */ static int yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event) { if (!yaml_emitter_process_anchor(emitter)) return 0; if (!yaml_emitter_process_tag(emitter)) return 0; if (emitter->flow_level || emitter->canonical || event->data.mapping_start.style == YAML_FLOW_MAPPING_STYLE || yaml_emitter_check_empty_mapping(emitter)) { emitter->state = YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE; } else { emitter->state = YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE; } return 1; } /* * Check if the document content is an empty scalar. */ static int yaml_emitter_check_empty_document(SHIM(yaml_emitter_t *emitter)) { return 0; } /* * Check if the next events represent an empty sequence. */ static int yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter) { if (emitter->events.tail - emitter->events.head < 2) return 0; return (emitter->events.head[0].type == YAML_SEQUENCE_START_EVENT && emitter->events.head[1].type == YAML_SEQUENCE_END_EVENT); } /* * Check if the next events represent an empty mapping. */ static int yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter) { if (emitter->events.tail - emitter->events.head < 2) return 0; return (emitter->events.head[0].type == YAML_MAPPING_START_EVENT && emitter->events.head[1].type == YAML_MAPPING_END_EVENT); } /* * Check if the next node can be expressed as a simple key. */ static int yaml_emitter_check_simple_key(yaml_emitter_t *emitter) { yaml_event_t *event = emitter->events.head; size_t length = 0; switch (event->type) { case YAML_ALIAS_EVENT: length += emitter->anchor_data.anchor_length; break; case YAML_SCALAR_EVENT: if (emitter->scalar_data.multiline) return 0; length += emitter->anchor_data.anchor_length + emitter->tag_data.handle_length + emitter->tag_data.suffix_length + emitter->scalar_data.length; break; case YAML_SEQUENCE_START_EVENT: if (!yaml_emitter_check_empty_sequence(emitter)) return 0; length += emitter->anchor_data.anchor_length + emitter->tag_data.handle_length + emitter->tag_data.suffix_length; break; case YAML_MAPPING_START_EVENT: if (!yaml_emitter_check_empty_mapping(emitter)) return 0; length += emitter->anchor_data.anchor_length + emitter->tag_data.handle_length + emitter->tag_data.suffix_length; break; default: return 0; } if (length > 128) return 0; return 1; } /* * Determine an acceptable scalar style. */ static int yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event) { yaml_scalar_style_t style = event->data.scalar.style; int no_tag = (!emitter->tag_data.handle && !emitter->tag_data.suffix); if (no_tag && !event->data.scalar.plain_implicit && !event->data.scalar.quoted_implicit) { return yaml_emitter_set_emitter_error(emitter, "neither tag nor implicit flags are specified"); } if (style == YAML_ANY_SCALAR_STYLE) style = YAML_PLAIN_SCALAR_STYLE; if (emitter->canonical) style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; if (emitter->simple_key_context && emitter->scalar_data.multiline) style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; if (style == YAML_PLAIN_SCALAR_STYLE) { if ((emitter->flow_level && !emitter->scalar_data.flow_plain_allowed) || (!emitter->flow_level && !emitter->scalar_data.block_plain_allowed)) style = YAML_SINGLE_QUOTED_SCALAR_STYLE; if (!emitter->scalar_data.length && (emitter->flow_level || emitter->simple_key_context)) style = YAML_SINGLE_QUOTED_SCALAR_STYLE; if (no_tag && !event->data.scalar.plain_implicit) style = YAML_SINGLE_QUOTED_SCALAR_STYLE; } if (style == YAML_SINGLE_QUOTED_SCALAR_STYLE) { if (!emitter->scalar_data.single_quoted_allowed) style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; } if (style == YAML_LITERAL_SCALAR_STYLE || style == YAML_FOLDED_SCALAR_STYLE) { if (!emitter->scalar_data.block_allowed || emitter->flow_level || emitter->simple_key_context) style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; } if (no_tag && !event->data.scalar.quoted_implicit && style != YAML_PLAIN_SCALAR_STYLE) { emitter->tag_data.handle = (yaml_char_t *)"!"; emitter->tag_data.handle_length = 1; } emitter->scalar_data.style = style; return 1; } /* * Write an anchor. */ static int yaml_emitter_process_anchor(yaml_emitter_t *emitter) { if (!emitter->anchor_data.anchor) return 1; if (!yaml_emitter_write_indicator(emitter, (emitter->anchor_data.alias ? "*" : "&"), 1, 0, 0)) return 0; return yaml_emitter_write_anchor(emitter, emitter->anchor_data.anchor, emitter->anchor_data.anchor_length); } /* * Write a tag. */ static int yaml_emitter_process_tag(yaml_emitter_t *emitter) { if (!emitter->tag_data.handle && !emitter->tag_data.suffix) return 1; if (emitter->tag_data.handle) { if (!yaml_emitter_write_tag_handle(emitter, emitter->tag_data.handle, emitter->tag_data.handle_length)) return 0; if (emitter->tag_data.suffix) { if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix, emitter->tag_data.suffix_length, 0)) return 0; } } else { if (!yaml_emitter_write_indicator(emitter, "!<", 1, 0, 0)) return 0; if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix, emitter->tag_data.suffix_length, 0)) return 0; if (!yaml_emitter_write_indicator(emitter, ">", 0, 0, 0)) return 0; } return 1; } /* * Write a scalar. */ static int yaml_emitter_process_scalar(yaml_emitter_t *emitter) { switch (emitter->scalar_data.style) { case YAML_PLAIN_SCALAR_STYLE: return yaml_emitter_write_plain_scalar(emitter, emitter->scalar_data.value, emitter->scalar_data.length, !emitter->simple_key_context); case YAML_SINGLE_QUOTED_SCALAR_STYLE: return yaml_emitter_write_single_quoted_scalar(emitter, emitter->scalar_data.value, emitter->scalar_data.length, !emitter->simple_key_context); case YAML_DOUBLE_QUOTED_SCALAR_STYLE: return yaml_emitter_write_double_quoted_scalar(emitter, emitter->scalar_data.value, emitter->scalar_data.length, !emitter->simple_key_context); case YAML_LITERAL_SCALAR_STYLE: return yaml_emitter_write_literal_scalar(emitter, emitter->scalar_data.value, emitter->scalar_data.length); case YAML_FOLDED_SCALAR_STYLE: return yaml_emitter_write_folded_scalar(emitter, emitter->scalar_data.value, emitter->scalar_data.length); default: assert(1); /* Impossible. */ } return 0; } /* * Check if a %YAML directive is valid. */ static int yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter, yaml_version_directive_t version_directive) { if (version_directive.major != 1 || ( version_directive.minor != 1 && version_directive.minor != 2 )) { return yaml_emitter_set_emitter_error(emitter, "incompatible %YAML directive"); } return 1; } /* * Check if a %TAG directive is valid. */ static int yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter, yaml_tag_directive_t tag_directive) { yaml_string_t handle; yaml_string_t prefix; size_t handle_length; size_t prefix_length; handle_length = strlen((char *)tag_directive.handle); prefix_length = strlen((char *)tag_directive.prefix); STRING_ASSIGN(handle, tag_directive.handle, handle_length); STRING_ASSIGN(prefix, tag_directive.prefix, prefix_length); if (handle.start == handle.end) { return yaml_emitter_set_emitter_error(emitter, "tag handle must not be empty"); } if (handle.start[0] != '!') { return yaml_emitter_set_emitter_error(emitter, "tag handle must start with '!'"); } if (handle.end[-1] != '!') { return yaml_emitter_set_emitter_error(emitter, "tag handle must end with '!'"); } handle.pointer ++; while (handle.pointer < handle.end-1) { if (!IS_ALPHA(handle)) { return yaml_emitter_set_emitter_error(emitter, "tag handle must contain alphanumerical characters only"); } MOVE(handle); } if (prefix.start == prefix.end) { return yaml_emitter_set_emitter_error(emitter, "tag prefix must not be empty"); } return 1; } /* * Check if an anchor is valid. */ static int yaml_emitter_analyze_anchor(yaml_emitter_t *emitter, yaml_char_t *anchor, int alias) { size_t anchor_length; yaml_string_t string; anchor_length = strlen((char *)anchor); STRING_ASSIGN(string, anchor, anchor_length); if (string.start == string.end) { return yaml_emitter_set_emitter_error(emitter, alias ? "alias value must not be empty" : "anchor value must not be empty"); } while (string.pointer != string.end) { if (!IS_ALPHA(string)) { return yaml_emitter_set_emitter_error(emitter, alias ? "alias value must contain alphanumerical characters only" : "anchor value must contain alphanumerical characters only"); } MOVE(string); } emitter->anchor_data.anchor = string.start; emitter->anchor_data.anchor_length = string.end - string.start; emitter->anchor_data.alias = alias; return 1; } /* * Check if a tag is valid. */ static int yaml_emitter_analyze_tag(yaml_emitter_t *emitter, yaml_char_t *tag) { size_t tag_length; yaml_string_t string; yaml_tag_directive_t *tag_directive; tag_length = strlen((char *)tag); STRING_ASSIGN(string, tag, tag_length); if (string.start == string.end) { return yaml_emitter_set_emitter_error(emitter, "tag value must not be empty"); } for (tag_directive = emitter->tag_directives.start; tag_directive != emitter->tag_directives.top; tag_directive ++) { size_t prefix_length = strlen((char *)tag_directive->prefix); if (prefix_length < (size_t)(string.end - string.start) && strncmp((char *)tag_directive->prefix, (char *)string.start, prefix_length) == 0) { emitter->tag_data.handle = tag_directive->handle; emitter->tag_data.handle_length = strlen((char *)tag_directive->handle); emitter->tag_data.suffix = string.start + prefix_length; emitter->tag_data.suffix_length = (string.end - string.start) - prefix_length; return 1; } } emitter->tag_data.suffix = string.start; emitter->tag_data.suffix_length = string.end - string.start; return 1; } /* * Check if a scalar is valid. */ static int yaml_emitter_analyze_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length) { yaml_string_t string; int block_indicators = 0; int flow_indicators = 0; int line_breaks = 0; int special_characters = 0; int leading_space = 0; int leading_break = 0; int trailing_space = 0; int trailing_break = 0; int break_space = 0; int space_break = 0; int preceded_by_whitespace = 0; int followed_by_whitespace = 0; int previous_space = 0; int previous_break = 0; STRING_ASSIGN(string, value, length); emitter->scalar_data.value = value; emitter->scalar_data.length = length; if (string.start == string.end) { emitter->scalar_data.multiline = 0; emitter->scalar_data.flow_plain_allowed = 0; emitter->scalar_data.block_plain_allowed = 1; emitter->scalar_data.single_quoted_allowed = 1; emitter->scalar_data.block_allowed = 0; return 1; } if ((CHECK_AT(string, '-', 0) && CHECK_AT(string, '-', 1) && CHECK_AT(string, '-', 2)) || (CHECK_AT(string, '.', 0) && CHECK_AT(string, '.', 1) && CHECK_AT(string, '.', 2))) { block_indicators = 1; flow_indicators = 1; } preceded_by_whitespace = 1; followed_by_whitespace = IS_BLANKZ_AT(string, WIDTH(string)); while (string.pointer != string.end) { if (string.start == string.pointer) { if (CHECK(string, '#') || CHECK(string, ',') || CHECK(string, '[') || CHECK(string, ']') || CHECK(string, '{') || CHECK(string, '}') || CHECK(string, '&') || CHECK(string, '*') || CHECK(string, '!') || CHECK(string, '|') || CHECK(string, '>') || CHECK(string, '\'') || CHECK(string, '"') || CHECK(string, '%') || CHECK(string, '@') || CHECK(string, '`')) { flow_indicators = 1; block_indicators = 1; } if (CHECK(string, '?') || CHECK(string, ':')) { flow_indicators = 1; if (followed_by_whitespace) { block_indicators = 1; } } if (CHECK(string, '-') && followed_by_whitespace) { flow_indicators = 1; block_indicators = 1; } } else { if (CHECK(string, ',') || CHECK(string, '?') || CHECK(string, '[') || CHECK(string, ']') || CHECK(string, '{') || CHECK(string, '}')) { flow_indicators = 1; } if (CHECK(string, ':')) { flow_indicators = 1; if (followed_by_whitespace) { block_indicators = 1; } } if (CHECK(string, '#') && preceded_by_whitespace) { flow_indicators = 1; block_indicators = 1; } } if (!IS_PRINTABLE(string) || (!IS_ASCII(string) && !emitter->unicode)) { special_characters = 1; } if (IS_BREAK(string)) { line_breaks = 1; } if (IS_SPACE(string)) { if (string.start == string.pointer) { leading_space = 1; } if (string.pointer+WIDTH(string) == string.end) { trailing_space = 1; } if (previous_break) { break_space = 1; } previous_space = 1; previous_break = 0; } else if (IS_BREAK(string)) { if (string.start == string.pointer) { leading_break = 1; } if (string.pointer+WIDTH(string) == string.end) { trailing_break = 1; } if (previous_space) { space_break = 1; } previous_space = 0; previous_break = 1; } else { previous_space = 0; previous_break = 0; } preceded_by_whitespace = IS_BLANKZ(string); MOVE(string); if (string.pointer != string.end) { followed_by_whitespace = IS_BLANKZ_AT(string, WIDTH(string)); } } emitter->scalar_data.multiline = line_breaks; emitter->scalar_data.flow_plain_allowed = 1; emitter->scalar_data.block_plain_allowed = 1; emitter->scalar_data.single_quoted_allowed = 1; emitter->scalar_data.block_allowed = 1; if (leading_space || leading_break || trailing_space || trailing_break) { emitter->scalar_data.flow_plain_allowed = 0; emitter->scalar_data.block_plain_allowed = 0; } if (trailing_space) { emitter->scalar_data.block_allowed = 0; } if (break_space) { emitter->scalar_data.flow_plain_allowed = 0; emitter->scalar_data.block_plain_allowed = 0; emitter->scalar_data.single_quoted_allowed = 0; } if (space_break || special_characters) { emitter->scalar_data.flow_plain_allowed = 0; emitter->scalar_data.block_plain_allowed = 0; emitter->scalar_data.single_quoted_allowed = 0; emitter->scalar_data.block_allowed = 0; } if (line_breaks) { emitter->scalar_data.flow_plain_allowed = 0; emitter->scalar_data.block_plain_allowed = 0; } if (flow_indicators) { emitter->scalar_data.flow_plain_allowed = 0; } if (block_indicators) { emitter->scalar_data.block_plain_allowed = 0; } return 1; } /* * Check if the event data is valid. */ static int yaml_emitter_analyze_event(yaml_emitter_t *emitter, yaml_event_t *event) { emitter->anchor_data.anchor = NULL; emitter->anchor_data.anchor_length = 0; emitter->tag_data.handle = NULL; emitter->tag_data.handle_length = 0; emitter->tag_data.suffix = NULL; emitter->tag_data.suffix_length = 0; emitter->scalar_data.value = NULL; emitter->scalar_data.length = 0; switch (event->type) { case YAML_ALIAS_EVENT: if (!yaml_emitter_analyze_anchor(emitter, event->data.alias.anchor, 1)) return 0; return 1; case YAML_SCALAR_EVENT: if (event->data.scalar.anchor) { if (!yaml_emitter_analyze_anchor(emitter, event->data.scalar.anchor, 0)) return 0; } if (event->data.scalar.tag && (emitter->canonical || (!event->data.scalar.plain_implicit && !event->data.scalar.quoted_implicit))) { if (!yaml_emitter_analyze_tag(emitter, event->data.scalar.tag)) return 0; } if (!yaml_emitter_analyze_scalar(emitter, event->data.scalar.value, event->data.scalar.length)) return 0; return 1; case YAML_SEQUENCE_START_EVENT: if (event->data.sequence_start.anchor) { if (!yaml_emitter_analyze_anchor(emitter, event->data.sequence_start.anchor, 0)) return 0; } if (event->data.sequence_start.tag && (emitter->canonical || !event->data.sequence_start.implicit)) { if (!yaml_emitter_analyze_tag(emitter, event->data.sequence_start.tag)) return 0; } return 1; case YAML_MAPPING_START_EVENT: if (event->data.mapping_start.anchor) { if (!yaml_emitter_analyze_anchor(emitter, event->data.mapping_start.anchor, 0)) return 0; } if (event->data.mapping_start.tag && (emitter->canonical || !event->data.mapping_start.implicit)) { if (!yaml_emitter_analyze_tag(emitter, event->data.mapping_start.tag)) return 0; } return 1; default: return 1; } } /* * Write the BOM character. */ static int yaml_emitter_write_bom(yaml_emitter_t *emitter) { if (!FLUSH(emitter)) return 0; *(emitter->buffer.pointer++) = (yaml_char_t) '\xEF'; *(emitter->buffer.pointer++) = (yaml_char_t) '\xBB'; *(emitter->buffer.pointer++) = (yaml_char_t) '\xBF'; return 1; } static int yaml_emitter_write_indent(yaml_emitter_t *emitter) { int indent = (emitter->indent >= 0) ? emitter->indent : 0; if (!emitter->indention || emitter->column > indent || (emitter->column == indent && !emitter->whitespace)) { if (!PUT_BREAK(emitter)) return 0; } while (emitter->column < indent) { if (!PUT(emitter, ' ')) return 0; } emitter->whitespace = 1; emitter->indention = 1; return 1; } static int yaml_emitter_write_indicator(yaml_emitter_t *emitter, const char *indicator, int need_whitespace, int is_whitespace, int is_indention) { size_t indicator_length; yaml_string_t string; indicator_length = strlen(indicator); STRING_ASSIGN(string, (yaml_char_t *)indicator, indicator_length); if (need_whitespace && !emitter->whitespace) { if (!PUT(emitter, ' ')) return 0; } while (string.pointer != string.end) { if (!WRITE(emitter, string)) return 0; } emitter->whitespace = is_whitespace; emitter->indention = (emitter->indention && is_indention); return 1; } static int yaml_emitter_write_anchor(yaml_emitter_t *emitter, yaml_char_t *value, size_t length) { yaml_string_t string; STRING_ASSIGN(string, value, length); while (string.pointer != string.end) { if (!WRITE(emitter, string)) return 0; } emitter->whitespace = 0; emitter->indention = 0; return 1; } static int yaml_emitter_write_tag_handle(yaml_emitter_t *emitter, yaml_char_t *value, size_t length) { yaml_string_t string; STRING_ASSIGN(string, value, length); if (!emitter->whitespace) { if (!PUT(emitter, ' ')) return 0; } while (string.pointer != string.end) { if (!WRITE(emitter, string)) return 0; } emitter->whitespace = 0; emitter->indention = 0; return 1; } static int yaml_emitter_write_tag_content(yaml_emitter_t *emitter, yaml_char_t *value, size_t length, int need_whitespace) { yaml_string_t string; STRING_ASSIGN(string, value, length); if (need_whitespace && !emitter->whitespace) { if (!PUT(emitter, ' ')) return 0; } while (string.pointer != string.end) { if (IS_ALPHA(string) || CHECK(string, ';') || CHECK(string, '/') || CHECK(string, '?') || CHECK(string, ':') || CHECK(string, '@') || CHECK(string, '&') || CHECK(string, '=') || CHECK(string, '+') || CHECK(string, '$') || CHECK(string, ',') || CHECK(string, '_') || CHECK(string, '.') || CHECK(string, '~') || CHECK(string, '*') || CHECK(string, '\'') || CHECK(string, '(') || CHECK(string, ')') || CHECK(string, '[') || CHECK(string, ']')) { if (!WRITE(emitter, string)) return 0; } else { int width = WIDTH(string); unsigned int value; while (width --) { value = *(string.pointer++); if (!PUT(emitter, '%')) return 0; if (!PUT(emitter, (value >> 4) + ((value >> 4) < 10 ? '0' : 'A' - 10))) return 0; if (!PUT(emitter, (value & 0x0F) + ((value & 0x0F) < 10 ? '0' : 'A' - 10))) return 0; } } } emitter->whitespace = 0; emitter->indention = 0; return 1; } static int yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length, int allow_breaks) { yaml_string_t string; int spaces = 0; int breaks = 0; STRING_ASSIGN(string, value, length); /** * Avoid trailing spaces for empty values in block mode. * In flow mode, we still want the space to prevent ambiguous things * like {a:}. * Currently, the emitter forbids any plain empty scalar in flow mode * (e.g. it outputs {a: ''} instead), so emitter->flow_level will * never be true here. * But if the emitter is ever changed to allow emitting empty values, * the check for flow_level is already here. */ if (!emitter->whitespace && (length || emitter->flow_level)) { if (!PUT(emitter, ' ')) return 0; } while (string.pointer != string.end) { if (IS_SPACE(string)) { if (allow_breaks && !spaces && emitter->column > emitter->best_width && !IS_SPACE_AT(string, 1)) { if (!yaml_emitter_write_indent(emitter)) return 0; MOVE(string); } else { if (!WRITE(emitter, string)) return 0; } spaces = 1; } else if (IS_BREAK(string)) { if (!breaks && CHECK(string, '\n')) { if (!PUT_BREAK(emitter)) return 0; } if (!WRITE_BREAK(emitter, string)) return 0; emitter->indention = 1; breaks = 1; } else { if (breaks) { if (!yaml_emitter_write_indent(emitter)) return 0; } if (!WRITE(emitter, string)) return 0; emitter->indention = 0; spaces = 0; breaks = 0; } } emitter->whitespace = 0; emitter->indention = 0; return 1; } static int yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length, int allow_breaks) { yaml_string_t string; int spaces = 0; int breaks = 0; STRING_ASSIGN(string, value, length); if (!yaml_emitter_write_indicator(emitter, "'", 1, 0, 0)) return 0; while (string.pointer != string.end) { if (IS_SPACE(string)) { if (allow_breaks && !spaces && emitter->column > emitter->best_width && string.pointer != string.start && string.pointer != string.end - 1 && !IS_SPACE_AT(string, 1)) { if (!yaml_emitter_write_indent(emitter)) return 0; MOVE(string); } else { if (!WRITE(emitter, string)) return 0; } spaces = 1; } else if (IS_BREAK(string)) { if (!breaks && CHECK(string, '\n')) { if (!PUT_BREAK(emitter)) return 0; } if (!WRITE_BREAK(emitter, string)) return 0; emitter->indention = 1; breaks = 1; } else { if (breaks) { if (!yaml_emitter_write_indent(emitter)) return 0; } if (CHECK(string, '\'')) { if (!PUT(emitter, '\'')) return 0; } if (!WRITE(emitter, string)) return 0; emitter->indention = 0; spaces = 0; breaks = 0; } } if (breaks) if (!yaml_emitter_write_indent(emitter)) return 0; if (!yaml_emitter_write_indicator(emitter, "'", 0, 0, 0)) return 0; emitter->whitespace = 0; emitter->indention = 0; return 1; } static int yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length, int allow_breaks) { yaml_string_t string; int spaces = 0; STRING_ASSIGN(string, value, length); if (!yaml_emitter_write_indicator(emitter, "\"", 1, 0, 0)) return 0; while (string.pointer != string.end) { if (!IS_PRINTABLE(string) || (!emitter->unicode && !IS_ASCII(string)) || IS_BOM(string) || IS_BREAK(string) || CHECK(string, '"') || CHECK(string, '\\')) { unsigned char octet; unsigned int width; unsigned int value; int k; octet = string.pointer[0]; width = (octet & 0x80) == 0x00 ? 1 : (octet & 0xE0) == 0xC0 ? 2 : (octet & 0xF0) == 0xE0 ? 3 : (octet & 0xF8) == 0xF0 ? 4 : 0; value = (octet & 0x80) == 0x00 ? octet & 0x7F : (octet & 0xE0) == 0xC0 ? octet & 0x1F : (octet & 0xF0) == 0xE0 ? octet & 0x0F : (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; for (k = 1; k < (int)width; k ++) { octet = string.pointer[k]; value = (value << 6) + (octet & 0x3F); } string.pointer += width; if (!PUT(emitter, '\\')) return 0; switch (value) { case 0x00: if (!PUT(emitter, '0')) return 0; break; case 0x07: if (!PUT(emitter, 'a')) return 0; break; case 0x08: if (!PUT(emitter, 'b')) return 0; break; case 0x09: if (!PUT(emitter, 't')) return 0; break; case 0x0A: if (!PUT(emitter, 'n')) return 0; break; case 0x0B: if (!PUT(emitter, 'v')) return 0; break; case 0x0C: if (!PUT(emitter, 'f')) return 0; break; case 0x0D: if (!PUT(emitter, 'r')) return 0; break; case 0x1B: if (!PUT(emitter, 'e')) return 0; break; case 0x22: if (!PUT(emitter, '\"')) return 0; break; case 0x5C: if (!PUT(emitter, '\\')) return 0; break; case 0x85: if (!PUT(emitter, 'N')) return 0; break; case 0xA0: if (!PUT(emitter, '_')) return 0; break; case 0x2028: if (!PUT(emitter, 'L')) return 0; break; case 0x2029: if (!PUT(emitter, 'P')) return 0; break; default: if (value <= 0xFF) { if (!PUT(emitter, 'x')) return 0; width = 2; } else if (value <= 0xFFFF) { if (!PUT(emitter, 'u')) return 0; width = 4; } else { if (!PUT(emitter, 'U')) return 0; width = 8; } for (k = (width-1)*4; k >= 0; k -= 4) { int digit = (value >> k) & 0x0F; if (!PUT(emitter, digit + (digit < 10 ? '0' : 'A'-10))) return 0; } } spaces = 0; } else if (IS_SPACE(string)) { if (allow_breaks && !spaces && emitter->column > emitter->best_width && string.pointer != string.start && string.pointer != string.end - 1) { if (!yaml_emitter_write_indent(emitter)) return 0; if (IS_SPACE_AT(string, 1)) { if (!PUT(emitter, '\\')) return 0; } MOVE(string); } else { if (!WRITE(emitter, string)) return 0; } spaces = 1; } else { if (!WRITE(emitter, string)) return 0; spaces = 0; } } if (!yaml_emitter_write_indicator(emitter, "\"", 0, 0, 0)) return 0; emitter->whitespace = 0; emitter->indention = 0; return 1; } static int yaml_emitter_write_block_scalar_hints(yaml_emitter_t *emitter, yaml_string_t string) { char indent_hint[2]; const char *chomp_hint = NULL; if (IS_SPACE(string) || IS_BREAK(string)) { indent_hint[0] = '0' + (char)emitter->best_indent; indent_hint[1] = '\0'; if (!yaml_emitter_write_indicator(emitter, indent_hint, 0, 0, 0)) return 0; } emitter->open_ended = 0; string.pointer = string.end; if (string.start == string.pointer) { chomp_hint = "-"; } else { do { string.pointer --; } while ((*string.pointer & 0xC0) == 0x80); if (!IS_BREAK(string)) { chomp_hint = "-"; } else if (string.start == string.pointer) { chomp_hint = "+"; emitter->open_ended = 2; } else { do { string.pointer --; } while ((*string.pointer & 0xC0) == 0x80); if (IS_BREAK(string)) { chomp_hint = "+"; emitter->open_ended = 2; } } } if (chomp_hint) { if (!yaml_emitter_write_indicator(emitter, chomp_hint, 0, 0, 0)) return 0; } return 1; } static int yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length) { yaml_string_t string; int breaks = 1; STRING_ASSIGN(string, value, length); if (!yaml_emitter_write_indicator(emitter, "|", 1, 0, 0)) return 0; if (!yaml_emitter_write_block_scalar_hints(emitter, string)) return 0; if (!PUT_BREAK(emitter)) return 0; emitter->indention = 1; emitter->whitespace = 1; while (string.pointer != string.end) { if (IS_BREAK(string)) { if (!WRITE_BREAK(emitter, string)) return 0; emitter->indention = 1; breaks = 1; } else { if (breaks) { if (!yaml_emitter_write_indent(emitter)) return 0; } if (!WRITE(emitter, string)) return 0; emitter->indention = 0; breaks = 0; } } return 1; } static int yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter, yaml_char_t *value, size_t length) { yaml_string_t string; int breaks = 1; int leading_spaces = 1; STRING_ASSIGN(string, value, length); if (!yaml_emitter_write_indicator(emitter, ">", 1, 0, 0)) return 0; if (!yaml_emitter_write_block_scalar_hints(emitter, string)) return 0; if (!PUT_BREAK(emitter)) return 0; emitter->indention = 1; emitter->whitespace = 1; while (string.pointer != string.end) { if (IS_BREAK(string)) { if (!breaks && !leading_spaces && CHECK(string, '\n')) { int k = 0; while (IS_BREAK_AT(string, k)) { k += WIDTH_AT(string, k); } if (!IS_BLANKZ_AT(string, k)) { if (!PUT_BREAK(emitter)) return 0; } } if (!WRITE_BREAK(emitter, string)) return 0; emitter->indention = 1; breaks = 1; } else { if (breaks) { if (!yaml_emitter_write_indent(emitter)) return 0; leading_spaces = IS_BLANK(string); } if (!breaks && IS_SPACE(string) && !IS_SPACE_AT(string, 1) && emitter->column > emitter->best_width) { if (!yaml_emitter_write_indent(emitter)) return 0; MOVE(string); } else { if (!WRITE(emitter, string)) return 0; } emitter->indention = 0; breaks = 0; } } return 1; } /* * API functions. */ YAML_DECLARE(int) yaml_parser_load(yaml_parser_t *parser, yaml_document_t *document); /* * Error handling. */ static int yaml_parser_set_composer_error(yaml_parser_t *parser, const char *problem, yaml_mark_t problem_mark); static int yaml_parser_set_composer_error_context(yaml_parser_t *parser, const char *context, yaml_mark_t context_mark, const char *problem, yaml_mark_t problem_mark); /* * Alias handling. */ static int yaml_parser_register_anchor(yaml_parser_t *parser, int index, yaml_char_t *anchor); /* * Clean up functions. */ static void yaml_parser_delete_aliases(yaml_parser_t *parser); /* * Document loading context. */ struct loader_ctx { int *start; int *end; int *top; }; /* * Composer functions. */ static int yaml_parser_load_nodes(yaml_parser_t *parser, struct loader_ctx *ctx); static int yaml_parser_load_document(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_load_alias(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx); static int yaml_parser_load_scalar(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx); static int yaml_parser_load_sequence(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx); static int yaml_parser_load_mapping(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx); static int yaml_parser_load_sequence_end(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx); static int yaml_parser_load_mapping_end(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx); /* * Load the next document of the stream. */ YAML_DECLARE(int) yaml_parser_load(yaml_parser_t *parser, yaml_document_t *document) { yaml_event_t event; assert(parser); /* Non-NULL parser object is expected. */ assert(document); /* Non-NULL document object is expected. */ memset(document, 0, sizeof(yaml_document_t)); if (!STACK_INIT(parser, document->nodes, yaml_node_t*)) goto error; if (!parser->stream_start_produced) { if (!yaml_parser_parse(parser, &event)) goto error; assert(event.type == YAML_STREAM_START_EVENT); /* STREAM-START is expected. */ } if (parser->stream_end_produced) { return 1; } if (!yaml_parser_parse(parser, &event)) goto error; if (event.type == YAML_STREAM_END_EVENT) { return 1; } if (!STACK_INIT(parser, parser->aliases, yaml_alias_data_t*)) goto error; parser->document = document; if (!yaml_parser_load_document(parser, &event)) goto error; yaml_parser_delete_aliases(parser); parser->document = NULL; return 1; error: yaml_parser_delete_aliases(parser); yaml_document_delete(document); parser->document = NULL; return 0; } /* * Set composer error. */ static int yaml_parser_set_composer_error(yaml_parser_t *parser, const char *problem, yaml_mark_t problem_mark) { parser->error = YAML_COMPOSER_ERROR; parser->problem = problem; parser->problem_mark = problem_mark; return 0; } /* * Set composer error with context. */ static int yaml_parser_set_composer_error_context(yaml_parser_t *parser, const char *context, yaml_mark_t context_mark, const char *problem, yaml_mark_t problem_mark) { parser->error = YAML_COMPOSER_ERROR; parser->context = context; parser->context_mark = context_mark; parser->problem = problem; parser->problem_mark = problem_mark; return 0; } /* * Delete the stack of aliases. */ static void yaml_parser_delete_aliases(yaml_parser_t *parser) { while (!STACK_EMPTY(parser, parser->aliases)) { yaml_free(POP(parser, parser->aliases).anchor); } STACK_DEL(parser, parser->aliases); } /* * Compose a document object. */ static int yaml_parser_load_document(yaml_parser_t *parser, yaml_event_t *event) { struct loader_ctx ctx = { NULL, NULL, NULL }; assert(event->type == YAML_DOCUMENT_START_EVENT); /* DOCUMENT-START is expected. */ parser->document->version_directive = event->data.document_start.version_directive; parser->document->tag_directives.start = event->data.document_start.tag_directives.start; parser->document->tag_directives.end = event->data.document_start.tag_directives.end; parser->document->start_implicit = event->data.document_start.implicit; parser->document->start_mark = event->start_mark; if (!STACK_INIT(parser, ctx, int*)) return 0; if (!yaml_parser_load_nodes(parser, &ctx)) { STACK_DEL(parser, ctx); return 0; } STACK_DEL(parser, ctx); return 1; } /* * Compose a node tree. */ static int yaml_parser_load_nodes(yaml_parser_t *parser, struct loader_ctx *ctx) { yaml_event_t event; do { if (!yaml_parser_parse(parser, &event)) return 0; switch (event.type) { case YAML_ALIAS_EVENT: if (!yaml_parser_load_alias(parser, &event, ctx)) return 0; break; case YAML_SCALAR_EVENT: if (!yaml_parser_load_scalar(parser, &event, ctx)) return 0; break; case YAML_SEQUENCE_START_EVENT: if (!yaml_parser_load_sequence(parser, &event, ctx)) return 0; break; case YAML_SEQUENCE_END_EVENT: if (!yaml_parser_load_sequence_end(parser, &event, ctx)) return 0; break; case YAML_MAPPING_START_EVENT: if (!yaml_parser_load_mapping(parser, &event, ctx)) return 0; break; case YAML_MAPPING_END_EVENT: if (!yaml_parser_load_mapping_end(parser, &event, ctx)) return 0; break; default: assert(0); /* Could not happen. */ return 0; case YAML_DOCUMENT_END_EVENT: break; } } while (event.type != YAML_DOCUMENT_END_EVENT); parser->document->end_implicit = event.data.document_end.implicit; parser->document->end_mark = event.end_mark; return 1; } /* * Add an anchor. */ static int yaml_parser_register_anchor(yaml_parser_t *parser, int index, yaml_char_t *anchor) { yaml_alias_data_t data; yaml_alias_data_t *alias_data; if (!anchor) return 1; data.anchor = anchor; data.index = index; data.mark = parser->document->nodes.start[index-1].start_mark; for (alias_data = parser->aliases.start; alias_data != parser->aliases.top; alias_data ++) { if (strcmp((char *)alias_data->anchor, (char *)anchor) == 0) { yaml_free(anchor); return yaml_parser_set_composer_error_context(parser, "found duplicate anchor; first occurrence", alias_data->mark, "second occurrence", data.mark); } } if (!PUSH(parser, parser->aliases, data)) { yaml_free(anchor); return 0; } return 1; } /* * Compose node into its parent in the stree. */ static int yaml_parser_load_node_add(yaml_parser_t *parser, struct loader_ctx *ctx, int index) { struct yaml_node_s *parent; int parent_index; if (STACK_EMPTY(parser, *ctx)) { /* This is the root node, there's no tree to add it to. */ return 1; } parent_index = *((*ctx).top - 1); parent = &parser->document->nodes.start[parent_index-1]; switch (parent->type) { case YAML_SEQUENCE_NODE: if (!STACK_LIMIT(parser, parent->data.sequence.items, INT_MAX-1)) return 0; if (!PUSH(parser, parent->data.sequence.items, index)) return 0; break; case YAML_MAPPING_NODE: { yaml_node_pair_t pair; if (!STACK_EMPTY(parser, parent->data.mapping.pairs)) { yaml_node_pair_t *p = parent->data.mapping.pairs.top - 1; if (p->key != 0 && p->value == 0) { p->value = index; break; } } pair.key = index; pair.value = 0; if (!STACK_LIMIT(parser, parent->data.mapping.pairs, INT_MAX-1)) return 0; if (!PUSH(parser, parent->data.mapping.pairs, pair)) return 0; break; } default: assert(0); /* Could not happen. */ return 0; } return 1; } /* * Compose a node corresponding to an alias. */ static int yaml_parser_load_alias(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx) { yaml_char_t *anchor = event->data.alias.anchor; yaml_alias_data_t *alias_data; for (alias_data = parser->aliases.start; alias_data != parser->aliases.top; alias_data ++) { if (strcmp((char *)alias_data->anchor, (char *)anchor) == 0) { yaml_free(anchor); return yaml_parser_load_node_add(parser, ctx, alias_data->index); } } yaml_free(anchor); return yaml_parser_set_composer_error(parser, "found undefined alias", event->start_mark); } /* * Compose a scalar node. */ static int yaml_parser_load_scalar(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx) { yaml_node_t node; int index; yaml_char_t *tag = event->data.scalar.tag; if (!STACK_LIMIT(parser, parser->document->nodes, INT_MAX-1)) goto error; if (!tag || strcmp((char *)tag, "!") == 0) { yaml_free(tag); tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SCALAR_TAG); if (!tag) goto error; } SCALAR_NODE_INIT(node, tag, event->data.scalar.value, event->data.scalar.length, event->data.scalar.style, event->start_mark, event->end_mark); if (!PUSH(parser, parser->document->nodes, node)) goto error; index = parser->document->nodes.top - parser->document->nodes.start; if (!yaml_parser_register_anchor(parser, index, event->data.scalar.anchor)) return 0; return yaml_parser_load_node_add(parser, ctx, index); error: yaml_free(tag); yaml_free(event->data.scalar.anchor); yaml_free(event->data.scalar.value); return 0; } /* * Compose a sequence node. */ static int yaml_parser_load_sequence(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx) { yaml_node_t node; struct { yaml_node_item_t *start; yaml_node_item_t *end; yaml_node_item_t *top; } items = { NULL, NULL, NULL }; int index; yaml_char_t *tag = event->data.sequence_start.tag; if (!STACK_LIMIT(parser, parser->document->nodes, INT_MAX-1)) goto error; if (!tag || strcmp((char *)tag, "!") == 0) { yaml_free(tag); tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SEQUENCE_TAG); if (!tag) goto error; } if (!STACK_INIT(parser, items, yaml_node_item_t*)) goto error; SEQUENCE_NODE_INIT(node, tag, items.start, items.end, event->data.sequence_start.style, event->start_mark, event->end_mark); if (!PUSH(parser, parser->document->nodes, node)) goto error; index = parser->document->nodes.top - parser->document->nodes.start; if (!yaml_parser_register_anchor(parser, index, event->data.sequence_start.anchor)) return 0; if (!yaml_parser_load_node_add(parser, ctx, index)) return 0; if (!STACK_LIMIT(parser, *ctx, INT_MAX-1)) return 0; if (!PUSH(parser, *ctx, index)) return 0; return 1; error: yaml_free(tag); yaml_free(event->data.sequence_start.anchor); return 0; } static int yaml_parser_load_sequence_end(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx) { int index; assert(((*ctx).top - (*ctx).start) > 0); index = *((*ctx).top - 1); assert(parser->document->nodes.start[index-1].type == YAML_SEQUENCE_NODE); parser->document->nodes.start[index-1].end_mark = event->end_mark; (void)POP(parser, *ctx); return 1; } /* * Compose a mapping node. */ static int yaml_parser_load_mapping(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx) { yaml_node_t node; struct { yaml_node_pair_t *start; yaml_node_pair_t *end; yaml_node_pair_t *top; } pairs = { NULL, NULL, NULL }; int index; yaml_char_t *tag = event->data.mapping_start.tag; if (!STACK_LIMIT(parser, parser->document->nodes, INT_MAX-1)) goto error; if (!tag || strcmp((char *)tag, "!") == 0) { yaml_free(tag); tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_MAPPING_TAG); if (!tag) goto error; } if (!STACK_INIT(parser, pairs, yaml_node_pair_t*)) goto error; MAPPING_NODE_INIT(node, tag, pairs.start, pairs.end, event->data.mapping_start.style, event->start_mark, event->end_mark); if (!PUSH(parser, parser->document->nodes, node)) goto error; index = parser->document->nodes.top - parser->document->nodes.start; if (!yaml_parser_register_anchor(parser, index, event->data.mapping_start.anchor)) return 0; if (!yaml_parser_load_node_add(parser, ctx, index)) return 0; if (!STACK_LIMIT(parser, *ctx, INT_MAX-1)) return 0; if (!PUSH(parser, *ctx, index)) return 0; return 1; error: yaml_free(tag); yaml_free(event->data.mapping_start.anchor); return 0; } static int yaml_parser_load_mapping_end(yaml_parser_t *parser, yaml_event_t *event, struct loader_ctx *ctx) { int index; assert(((*ctx).top - (*ctx).start) > 0); index = *((*ctx).top - 1); assert(parser->document->nodes.start[index-1].type == YAML_MAPPING_NODE); parser->document->nodes.start[index-1].end_mark = event->end_mark; (void)POP(parser, *ctx); return 1; } /* * The parser implements the following grammar: * * stream ::= STREAM-START implicit_document? explicit_document* STREAM-END * implicit_document ::= block_node DOCUMENT-END* * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* * block_node_or_indentless_sequence ::= * ALIAS * | properties (block_content | indentless_block_sequence)? * | block_content * | indentless_block_sequence * block_node ::= ALIAS * | properties block_content? * | block_content * flow_node ::= ALIAS * | properties flow_content? * | flow_content * properties ::= TAG ANCHOR? | ANCHOR TAG? * block_content ::= block_collection | flow_collection | SCALAR * flow_content ::= flow_collection | SCALAR * block_collection ::= block_sequence | block_mapping * flow_collection ::= flow_sequence | flow_mapping * block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END * indentless_sequence ::= (BLOCK-ENTRY block_node?)+ * block_mapping ::= BLOCK-MAPPING_START * ((KEY block_node_or_indentless_sequence?)? * (VALUE block_node_or_indentless_sequence?)?)* * BLOCK-END * flow_sequence ::= FLOW-SEQUENCE-START * (flow_sequence_entry FLOW-ENTRY)* * flow_sequence_entry? * FLOW-SEQUENCE-END * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? * flow_mapping ::= FLOW-MAPPING-START * (flow_mapping_entry FLOW-ENTRY)* * flow_mapping_entry? * FLOW-MAPPING-END * flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? */ /* * Peek the next token in the token queue. */ #define PEEK_TOKEN(parser) \ ((parser->token_available || yaml_parser_fetch_more_tokens(parser)) ? \ parser->tokens.head : NULL) /* * Remove the next token from the queue (must be called after PEEK_TOKEN). */ #define SKIP_TOKEN(parser) \ (parser->token_available = 0, \ parser->tokens_parsed ++, \ parser->stream_end_produced = \ (parser->tokens.head->type == YAML_STREAM_END_TOKEN), \ parser->tokens.head ++) /* * Public API declarations. */ YAML_DECLARE(int) yaml_parser_parse(yaml_parser_t *parser, yaml_event_t *event); /* * Error handling. */ static int yaml_parser_set_parser_error(yaml_parser_t *parser, const char *problem, yaml_mark_t problem_mark); static int yaml_parser_set_parser_error_context(yaml_parser_t *parser, const char *context, yaml_mark_t context_mark, const char *problem, yaml_mark_t problem_mark); /* * State functions. */ static int yaml_parser_state_machine(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_stream_start(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_document_start(yaml_parser_t *parser, yaml_event_t *event, int implicit); static int yaml_parser_parse_document_content(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_document_end(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_node(yaml_parser_t *parser, yaml_event_t *event, int block, int indentless_sequence); static int yaml_parser_parse_block_sequence_entry(yaml_parser_t *parser, yaml_event_t *event, int first); static int yaml_parser_parse_indentless_sequence_entry(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_block_mapping_key(yaml_parser_t *parser, yaml_event_t *event, int first); static int yaml_parser_parse_block_mapping_value(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_flow_sequence_entry(yaml_parser_t *parser, yaml_event_t *event, int first); static int yaml_parser_parse_flow_sequence_entry_mapping_key(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_flow_sequence_entry_mapping_value(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_flow_sequence_entry_mapping_end(yaml_parser_t *parser, yaml_event_t *event); static int yaml_parser_parse_flow_mapping_key(yaml_parser_t *parser, yaml_event_t *event, int first); static int yaml_parser_parse_flow_mapping_value(yaml_parser_t *parser, yaml_event_t *event, int empty); /* * Utility functions. */ static int yaml_parser_process_empty_scalar(yaml_parser_t *parser, yaml_event_t *event, yaml_mark_t mark); static int yaml_parser_process_directives(yaml_parser_t *parser, yaml_version_directive_t **version_directive_ref, yaml_tag_directive_t **tag_directives_start_ref, yaml_tag_directive_t **tag_directives_end_ref); static int yaml_parser_append_tag_directive(yaml_parser_t *parser, yaml_tag_directive_t value, int allow_duplicates, yaml_mark_t mark); /* * Get the next event. */ YAML_DECLARE(int) yaml_parser_parse(yaml_parser_t *parser, yaml_event_t *event) { assert(parser); /* Non-NULL parser object is expected. */ assert(event); /* Non-NULL event object is expected. */ /* Erase the event object. */ memset(event, 0, sizeof(yaml_event_t)); /* No events after the end of the stream or error. */ if (parser->stream_end_produced || parser->error || parser->state == YAML_PARSE_END_STATE) { return 1; } /* Generate the next event. */ return yaml_parser_state_machine(parser, event); } /* * Set parser error. */ static int yaml_parser_set_parser_error(yaml_parser_t *parser, const char *problem, yaml_mark_t problem_mark) { parser->error = YAML_PARSER_ERROR; parser->problem = problem; parser->problem_mark = problem_mark; return 0; } static int yaml_parser_set_parser_error_context(yaml_parser_t *parser, const char *context, yaml_mark_t context_mark, const char *problem, yaml_mark_t problem_mark) { parser->error = YAML_PARSER_ERROR; parser->context = context; parser->context_mark = context_mark; parser->problem = problem; parser->problem_mark = problem_mark; return 0; } /* * State dispatcher. */ static int yaml_parser_state_machine(yaml_parser_t *parser, yaml_event_t *event) { switch (parser->state) { case YAML_PARSE_STREAM_START_STATE: return yaml_parser_parse_stream_start(parser, event); case YAML_PARSE_IMPLICIT_DOCUMENT_START_STATE: return yaml_parser_parse_document_start(parser, event, 1); case YAML_PARSE_DOCUMENT_START_STATE: return yaml_parser_parse_document_start(parser, event, 0); case YAML_PARSE_DOCUMENT_CONTENT_STATE: return yaml_parser_parse_document_content(parser, event); case YAML_PARSE_DOCUMENT_END_STATE: return yaml_parser_parse_document_end(parser, event); case YAML_PARSE_BLOCK_NODE_STATE: return yaml_parser_parse_node(parser, event, 1, 0); case YAML_PARSE_BLOCK_NODE_OR_INDENTLESS_SEQUENCE_STATE: return yaml_parser_parse_node(parser, event, 1, 1); case YAML_PARSE_FLOW_NODE_STATE: return yaml_parser_parse_node(parser, event, 0, 0); case YAML_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE: return yaml_parser_parse_block_sequence_entry(parser, event, 1); case YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE: return yaml_parser_parse_block_sequence_entry(parser, event, 0); case YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE: return yaml_parser_parse_indentless_sequence_entry(parser, event); case YAML_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE: return yaml_parser_parse_block_mapping_key(parser, event, 1); case YAML_PARSE_BLOCK_MAPPING_KEY_STATE: return yaml_parser_parse_block_mapping_key(parser, event, 0); case YAML_PARSE_BLOCK_MAPPING_VALUE_STATE: return yaml_parser_parse_block_mapping_value(parser, event); case YAML_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE: return yaml_parser_parse_flow_sequence_entry(parser, event, 1); case YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE: return yaml_parser_parse_flow_sequence_entry(parser, event, 0); case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE: return yaml_parser_parse_flow_sequence_entry_mapping_key(parser, event); case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE: return yaml_parser_parse_flow_sequence_entry_mapping_value(parser, event); case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE: return yaml_parser_parse_flow_sequence_entry_mapping_end(parser, event); case YAML_PARSE_FLOW_MAPPING_FIRST_KEY_STATE: return yaml_parser_parse_flow_mapping_key(parser, event, 1); case YAML_PARSE_FLOW_MAPPING_KEY_STATE: return yaml_parser_parse_flow_mapping_key(parser, event, 0); case YAML_PARSE_FLOW_MAPPING_VALUE_STATE: return yaml_parser_parse_flow_mapping_value(parser, event, 0); case YAML_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE: return yaml_parser_parse_flow_mapping_value(parser, event, 1); default: assert(1); /* Invalid state. */ } return 0; } /* * Parse the production: * stream ::= STREAM-START implicit_document? explicit_document* STREAM-END * ************ */ static int yaml_parser_parse_stream_start(yaml_parser_t *parser, yaml_event_t *event) { yaml_token_t *token; token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_STREAM_START_TOKEN) { return yaml_parser_set_parser_error(parser, "did not find expected ", token->start_mark); } parser->state = YAML_PARSE_IMPLICIT_DOCUMENT_START_STATE; STREAM_START_EVENT_INIT(*event, token->data.stream_start.encoding, token->start_mark, token->start_mark); SKIP_TOKEN(parser); return 1; } /* * Parse the productions: * implicit_document ::= block_node DOCUMENT-END* * * * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* * ************************* */ static int yaml_parser_parse_document_start(yaml_parser_t *parser, yaml_event_t *event, int implicit) { yaml_token_t *token; yaml_version_directive_t *version_directive = NULL; struct { yaml_tag_directive_t *start; yaml_tag_directive_t *end; } tag_directives = { NULL, NULL }; token = PEEK_TOKEN(parser); if (!token) return 0; /* Parse extra document end indicators. */ if (!implicit) { while (token->type == YAML_DOCUMENT_END_TOKEN) { SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; } } /* Parse an implicit document. */ if (implicit && token->type != YAML_VERSION_DIRECTIVE_TOKEN && token->type != YAML_TAG_DIRECTIVE_TOKEN && token->type != YAML_DOCUMENT_START_TOKEN && token->type != YAML_STREAM_END_TOKEN) { if (!yaml_parser_process_directives(parser, NULL, NULL, NULL)) return 0; if (!PUSH(parser, parser->states, YAML_PARSE_DOCUMENT_END_STATE)) return 0; parser->state = YAML_PARSE_BLOCK_NODE_STATE; DOCUMENT_START_EVENT_INIT(*event, NULL, NULL, NULL, 1, token->start_mark, token->start_mark); return 1; } /* Parse an explicit document. */ else if (token->type != YAML_STREAM_END_TOKEN) { yaml_mark_t start_mark, end_mark; start_mark = token->start_mark; if (!yaml_parser_process_directives(parser, &version_directive, &tag_directives.start, &tag_directives.end)) return 0; token = PEEK_TOKEN(parser); if (!token) goto error; if (token->type != YAML_DOCUMENT_START_TOKEN) { yaml_parser_set_parser_error(parser, "did not find expected ", token->start_mark); goto error; } if (!PUSH(parser, parser->states, YAML_PARSE_DOCUMENT_END_STATE)) goto error; parser->state = YAML_PARSE_DOCUMENT_CONTENT_STATE; end_mark = token->end_mark; DOCUMENT_START_EVENT_INIT(*event, version_directive, tag_directives.start, tag_directives.end, 0, start_mark, end_mark); SKIP_TOKEN(parser); version_directive = NULL; tag_directives.start = tag_directives.end = NULL; return 1; } /* Parse the stream end. */ else { parser->state = YAML_PARSE_END_STATE; STREAM_END_EVENT_INIT(*event, token->start_mark, token->end_mark); SKIP_TOKEN(parser); return 1; } error: yaml_free(version_directive); while (tag_directives.start != tag_directives.end) { yaml_free(tag_directives.end[-1].handle); yaml_free(tag_directives.end[-1].prefix); tag_directives.end --; } yaml_free(tag_directives.start); return 0; } /* * Parse the productions: * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* * *********** */ static int yaml_parser_parse_document_content(yaml_parser_t *parser, yaml_event_t *event) { yaml_token_t *token; token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type == YAML_VERSION_DIRECTIVE_TOKEN || token->type == YAML_TAG_DIRECTIVE_TOKEN || token->type == YAML_DOCUMENT_START_TOKEN || token->type == YAML_DOCUMENT_END_TOKEN || token->type == YAML_STREAM_END_TOKEN) { parser->state = POP(parser, parser->states); return yaml_parser_process_empty_scalar(parser, event, token->start_mark); } else { return yaml_parser_parse_node(parser, event, 1, 0); } } /* * Parse the productions: * implicit_document ::= block_node DOCUMENT-END* * ************* * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* * ************* */ static int yaml_parser_parse_document_end(yaml_parser_t *parser, yaml_event_t *event) { yaml_token_t *token; yaml_mark_t start_mark, end_mark; int implicit = 1; token = PEEK_TOKEN(parser); if (!token) return 0; start_mark = end_mark = token->start_mark; if (token->type == YAML_DOCUMENT_END_TOKEN) { end_mark = token->end_mark; SKIP_TOKEN(parser); implicit = 0; } while (!STACK_EMPTY(parser, parser->tag_directives)) { yaml_tag_directive_t tag_directive = POP(parser, parser->tag_directives); yaml_free(tag_directive.handle); yaml_free(tag_directive.prefix); } parser->state = YAML_PARSE_DOCUMENT_START_STATE; DOCUMENT_END_EVENT_INIT(*event, implicit, start_mark, end_mark); return 1; } /* * Parse the productions: * block_node_or_indentless_sequence ::= * ALIAS * ***** * | properties (block_content | indentless_block_sequence)? * ********** * * | block_content | indentless_block_sequence * * * block_node ::= ALIAS * ***** * | properties block_content? * ********** * * | block_content * * * flow_node ::= ALIAS * ***** * | properties flow_content? * ********** * * | flow_content * * * properties ::= TAG ANCHOR? | ANCHOR TAG? * ************************* * block_content ::= block_collection | flow_collection | SCALAR * ****** * flow_content ::= flow_collection | SCALAR * ****** */ static int yaml_parser_parse_node(yaml_parser_t *parser, yaml_event_t *event, int block, int indentless_sequence) { yaml_token_t *token; yaml_char_t *anchor = NULL; yaml_char_t *tag_handle = NULL; yaml_char_t *tag_suffix = NULL; yaml_char_t *tag = NULL; yaml_mark_t start_mark, end_mark, tag_mark; int implicit; token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type == YAML_ALIAS_TOKEN) { parser->state = POP(parser, parser->states); ALIAS_EVENT_INIT(*event, token->data.alias.value, token->start_mark, token->end_mark); SKIP_TOKEN(parser); return 1; } else { start_mark = end_mark = token->start_mark; if (token->type == YAML_ANCHOR_TOKEN) { anchor = token->data.anchor.value; start_mark = token->start_mark; end_mark = token->end_mark; SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) goto error; if (token->type == YAML_TAG_TOKEN) { tag_handle = token->data.tag.handle; tag_suffix = token->data.tag.suffix; tag_mark = token->start_mark; end_mark = token->end_mark; SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) goto error; } } else if (token->type == YAML_TAG_TOKEN) { tag_handle = token->data.tag.handle; tag_suffix = token->data.tag.suffix; start_mark = tag_mark = token->start_mark; end_mark = token->end_mark; SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) goto error; if (token->type == YAML_ANCHOR_TOKEN) { anchor = token->data.anchor.value; end_mark = token->end_mark; SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) goto error; } } if (tag_handle) { if (!*tag_handle) { tag = tag_suffix; yaml_free(tag_handle); tag_handle = tag_suffix = NULL; } else { yaml_tag_directive_t *tag_directive; for (tag_directive = parser->tag_directives.start; tag_directive != parser->tag_directives.top; tag_directive ++) { if (strcmp((char *)tag_directive->handle, (char *)tag_handle) == 0) { size_t prefix_len = strlen((char *)tag_directive->prefix); size_t suffix_len = strlen((char *)tag_suffix); tag = YAML_MALLOC(prefix_len+suffix_len+1); if (!tag) { parser->error = YAML_MEMORY_ERROR; goto error; } memcpy(tag, tag_directive->prefix, prefix_len); memcpy(tag+prefix_len, tag_suffix, suffix_len); tag[prefix_len+suffix_len] = '\0'; yaml_free(tag_handle); yaml_free(tag_suffix); tag_handle = tag_suffix = NULL; break; } } if (!tag) { yaml_parser_set_parser_error_context(parser, "while parsing a node", start_mark, "found undefined tag handle", tag_mark); goto error; } } } implicit = (!tag || !*tag); if (indentless_sequence && token->type == YAML_BLOCK_ENTRY_TOKEN) { end_mark = token->end_mark; parser->state = YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE; SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit, YAML_BLOCK_SEQUENCE_STYLE, start_mark, end_mark); return 1; } else { if (token->type == YAML_SCALAR_TOKEN) { int plain_implicit = 0; int quoted_implicit = 0; end_mark = token->end_mark; if ((token->data.scalar.style == YAML_PLAIN_SCALAR_STYLE && !tag) || (tag && strcmp((char *)tag, "!") == 0)) { plain_implicit = 1; } else if (!tag) { quoted_implicit = 1; } parser->state = POP(parser, parser->states); SCALAR_EVENT_INIT(*event, anchor, tag, token->data.scalar.value, token->data.scalar.length, plain_implicit, quoted_implicit, token->data.scalar.style, start_mark, end_mark); SKIP_TOKEN(parser); return 1; } else if (token->type == YAML_FLOW_SEQUENCE_START_TOKEN) { end_mark = token->end_mark; parser->state = YAML_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE; SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit, YAML_FLOW_SEQUENCE_STYLE, start_mark, end_mark); return 1; } else if (token->type == YAML_FLOW_MAPPING_START_TOKEN) { end_mark = token->end_mark; parser->state = YAML_PARSE_FLOW_MAPPING_FIRST_KEY_STATE; MAPPING_START_EVENT_INIT(*event, anchor, tag, implicit, YAML_FLOW_MAPPING_STYLE, start_mark, end_mark); return 1; } else if (block && token->type == YAML_BLOCK_SEQUENCE_START_TOKEN) { end_mark = token->end_mark; parser->state = YAML_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE; SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit, YAML_BLOCK_SEQUENCE_STYLE, start_mark, end_mark); return 1; } else if (block && token->type == YAML_BLOCK_MAPPING_START_TOKEN) { end_mark = token->end_mark; parser->state = YAML_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE; MAPPING_START_EVENT_INIT(*event, anchor, tag, implicit, YAML_BLOCK_MAPPING_STYLE, start_mark, end_mark); return 1; } else if (anchor || tag) { yaml_char_t *value = YAML_MALLOC(1); if (!value) { parser->error = YAML_MEMORY_ERROR; goto error; } value[0] = '\0'; parser->state = POP(parser, parser->states); SCALAR_EVENT_INIT(*event, anchor, tag, value, 0, implicit, 0, YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark); return 1; } else { yaml_parser_set_parser_error_context(parser, (block ? "while parsing a block node" : "while parsing a flow node"), start_mark, "did not find expected node content", token->start_mark); goto error; } } } error: yaml_free(anchor); yaml_free(tag_handle); yaml_free(tag_suffix); yaml_free(tag); return 0; } /* * Parse the productions: * block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END * ******************** *********** * ********* */ static int yaml_parser_parse_block_sequence_entry(yaml_parser_t *parser, yaml_event_t *event, int first) { yaml_token_t *token; if (first) { token = PEEK_TOKEN(parser); if (!PUSH(parser, parser->marks, token->start_mark)) return 0; SKIP_TOKEN(parser); } token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type == YAML_BLOCK_ENTRY_TOKEN) { yaml_mark_t mark = token->end_mark; SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_BLOCK_ENTRY_TOKEN && token->type != YAML_BLOCK_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE)) return 0; return yaml_parser_parse_node(parser, event, 1, 0); } else { parser->state = YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE; return yaml_parser_process_empty_scalar(parser, event, mark); } } else if (token->type == YAML_BLOCK_END_TOKEN) { parser->state = POP(parser, parser->states); (void)POP(parser, parser->marks); SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->end_mark); SKIP_TOKEN(parser); return 1; } else { return yaml_parser_set_parser_error_context(parser, "while parsing a block collection", POP(parser, parser->marks), "did not find expected '-' indicator", token->start_mark); } } /* * Parse the productions: * indentless_sequence ::= (BLOCK-ENTRY block_node?)+ * *********** * */ static int yaml_parser_parse_indentless_sequence_entry(yaml_parser_t *parser, yaml_event_t *event) { yaml_token_t *token; token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type == YAML_BLOCK_ENTRY_TOKEN) { yaml_mark_t mark = token->end_mark; SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_BLOCK_ENTRY_TOKEN && token->type != YAML_KEY_TOKEN && token->type != YAML_VALUE_TOKEN && token->type != YAML_BLOCK_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE)) return 0; return yaml_parser_parse_node(parser, event, 1, 0); } else { parser->state = YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE; return yaml_parser_process_empty_scalar(parser, event, mark); } } else { parser->state = POP(parser, parser->states); SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->start_mark); return 1; } } /* * Parse the productions: * block_mapping ::= BLOCK-MAPPING_START * ******************* * ((KEY block_node_or_indentless_sequence?)? * *** * * (VALUE block_node_or_indentless_sequence?)?)* * * BLOCK-END * ********* */ static int yaml_parser_parse_block_mapping_key(yaml_parser_t *parser, yaml_event_t *event, int first) { yaml_token_t *token; if (first) { token = PEEK_TOKEN(parser); if (!PUSH(parser, parser->marks, token->start_mark)) return 0; SKIP_TOKEN(parser); } token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type == YAML_KEY_TOKEN) { yaml_mark_t mark = token->end_mark; SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_KEY_TOKEN && token->type != YAML_VALUE_TOKEN && token->type != YAML_BLOCK_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_BLOCK_MAPPING_VALUE_STATE)) return 0; return yaml_parser_parse_node(parser, event, 1, 1); } else { parser->state = YAML_PARSE_BLOCK_MAPPING_VALUE_STATE; return yaml_parser_process_empty_scalar(parser, event, mark); } } else if (token->type == YAML_BLOCK_END_TOKEN) { parser->state = POP(parser, parser->states); (void)POP(parser, parser->marks); MAPPING_END_EVENT_INIT(*event, token->start_mark, token->end_mark); SKIP_TOKEN(parser); return 1; } else { return yaml_parser_set_parser_error_context(parser, "while parsing a block mapping", POP(parser, parser->marks), "did not find expected key", token->start_mark); } } /* * Parse the productions: * block_mapping ::= BLOCK-MAPPING_START * * ((KEY block_node_or_indentless_sequence?)? * * (VALUE block_node_or_indentless_sequence?)?)* * ***** * * BLOCK-END * */ static int yaml_parser_parse_block_mapping_value(yaml_parser_t *parser, yaml_event_t *event) { yaml_token_t *token; token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type == YAML_VALUE_TOKEN) { yaml_mark_t mark = token->end_mark; SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_KEY_TOKEN && token->type != YAML_VALUE_TOKEN && token->type != YAML_BLOCK_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_BLOCK_MAPPING_KEY_STATE)) return 0; return yaml_parser_parse_node(parser, event, 1, 1); } else { parser->state = YAML_PARSE_BLOCK_MAPPING_KEY_STATE; return yaml_parser_process_empty_scalar(parser, event, mark); } } else { parser->state = YAML_PARSE_BLOCK_MAPPING_KEY_STATE; return yaml_parser_process_empty_scalar(parser, event, token->start_mark); } } /* * Parse the productions: * flow_sequence ::= FLOW-SEQUENCE-START * ******************* * (flow_sequence_entry FLOW-ENTRY)* * * ********** * flow_sequence_entry? * * * FLOW-SEQUENCE-END * ***************** * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? * * */ static int yaml_parser_parse_flow_sequence_entry(yaml_parser_t *parser, yaml_event_t *event, int first) { yaml_token_t *token; if (first) { token = PEEK_TOKEN(parser); if (!PUSH(parser, parser->marks, token->start_mark)) return 0; SKIP_TOKEN(parser); } token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_FLOW_SEQUENCE_END_TOKEN) { if (!first) { if (token->type == YAML_FLOW_ENTRY_TOKEN) { SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; } else { return yaml_parser_set_parser_error_context(parser, "while parsing a flow sequence", POP(parser, parser->marks), "did not find expected ',' or ']'", token->start_mark); } } if (token->type == YAML_KEY_TOKEN) { parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE; MAPPING_START_EVENT_INIT(*event, NULL, NULL, 1, YAML_FLOW_MAPPING_STYLE, token->start_mark, token->end_mark); SKIP_TOKEN(parser); return 1; } else if (token->type != YAML_FLOW_SEQUENCE_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE)) return 0; return yaml_parser_parse_node(parser, event, 0, 0); } } parser->state = POP(parser, parser->states); (void)POP(parser, parser->marks); SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->end_mark); SKIP_TOKEN(parser); return 1; } /* * Parse the productions: * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? * *** * */ static int yaml_parser_parse_flow_sequence_entry_mapping_key(yaml_parser_t *parser, yaml_event_t *event) { yaml_token_t *token; token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_VALUE_TOKEN && token->type != YAML_FLOW_ENTRY_TOKEN && token->type != YAML_FLOW_SEQUENCE_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE)) return 0; return yaml_parser_parse_node(parser, event, 0, 0); } else { yaml_mark_t mark = token->end_mark; SKIP_TOKEN(parser); parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE; return yaml_parser_process_empty_scalar(parser, event, mark); } } /* * Parse the productions: * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? * ***** * */ static int yaml_parser_parse_flow_sequence_entry_mapping_value(yaml_parser_t *parser, yaml_event_t *event) { yaml_token_t *token; token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type == YAML_VALUE_TOKEN) { SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_FLOW_ENTRY_TOKEN && token->type != YAML_FLOW_SEQUENCE_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE)) return 0; return yaml_parser_parse_node(parser, event, 0, 0); } } parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE; return yaml_parser_process_empty_scalar(parser, event, token->start_mark); } /* * Parse the productions: * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? * * */ static int yaml_parser_parse_flow_sequence_entry_mapping_end(yaml_parser_t *parser, yaml_event_t *event) { yaml_token_t *token; token = PEEK_TOKEN(parser); if (!token) return 0; parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE; MAPPING_END_EVENT_INIT(*event, token->start_mark, token->start_mark); return 1; } /* * Parse the productions: * flow_mapping ::= FLOW-MAPPING-START * ****************** * (flow_mapping_entry FLOW-ENTRY)* * * ********** * flow_mapping_entry? * ****************** * FLOW-MAPPING-END * **************** * flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? * * *** * */ static int yaml_parser_parse_flow_mapping_key(yaml_parser_t *parser, yaml_event_t *event, int first) { yaml_token_t *token; if (first) { token = PEEK_TOKEN(parser); if (!PUSH(parser, parser->marks, token->start_mark)) return 0; SKIP_TOKEN(parser); } token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_FLOW_MAPPING_END_TOKEN) { if (!first) { if (token->type == YAML_FLOW_ENTRY_TOKEN) { SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; } else { return yaml_parser_set_parser_error_context(parser, "while parsing a flow mapping", POP(parser, parser->marks), "did not find expected ',' or '}'", token->start_mark); } } if (token->type == YAML_KEY_TOKEN) { SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_VALUE_TOKEN && token->type != YAML_FLOW_ENTRY_TOKEN && token->type != YAML_FLOW_MAPPING_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_FLOW_MAPPING_VALUE_STATE)) return 0; return yaml_parser_parse_node(parser, event, 0, 0); } else { parser->state = YAML_PARSE_FLOW_MAPPING_VALUE_STATE; return yaml_parser_process_empty_scalar(parser, event, token->start_mark); } } else if (token->type != YAML_FLOW_MAPPING_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE)) return 0; return yaml_parser_parse_node(parser, event, 0, 0); } } parser->state = POP(parser, parser->states); (void)POP(parser, parser->marks); MAPPING_END_EVENT_INIT(*event, token->start_mark, token->end_mark); SKIP_TOKEN(parser); return 1; } /* * Parse the productions: * flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? * * ***** * */ static int yaml_parser_parse_flow_mapping_value(yaml_parser_t *parser, yaml_event_t *event, int empty) { yaml_token_t *token; token = PEEK_TOKEN(parser); if (!token) return 0; if (empty) { parser->state = YAML_PARSE_FLOW_MAPPING_KEY_STATE; return yaml_parser_process_empty_scalar(parser, event, token->start_mark); } if (token->type == YAML_VALUE_TOKEN) { SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) return 0; if (token->type != YAML_FLOW_ENTRY_TOKEN && token->type != YAML_FLOW_MAPPING_END_TOKEN) { if (!PUSH(parser, parser->states, YAML_PARSE_FLOW_MAPPING_KEY_STATE)) return 0; return yaml_parser_parse_node(parser, event, 0, 0); } } parser->state = YAML_PARSE_FLOW_MAPPING_KEY_STATE; return yaml_parser_process_empty_scalar(parser, event, token->start_mark); } /* * Generate an empty scalar event. */ static int yaml_parser_process_empty_scalar(yaml_parser_t *parser, yaml_event_t *event, yaml_mark_t mark) { yaml_char_t *value; value = YAML_MALLOC(1); if (!value) { parser->error = YAML_MEMORY_ERROR; return 0; } value[0] = '\0'; SCALAR_EVENT_INIT(*event, NULL, NULL, value, 0, 1, 0, YAML_PLAIN_SCALAR_STYLE, mark, mark); return 1; } /* * Parse directives. */ static int yaml_parser_process_directives(yaml_parser_t *parser, yaml_version_directive_t **version_directive_ref, yaml_tag_directive_t **tag_directives_start_ref, yaml_tag_directive_t **tag_directives_end_ref) { yaml_tag_directive_t default_tag_directives[] = { {(yaml_char_t *)"!", (yaml_char_t *)"!"}, {(yaml_char_t *)"!!", (yaml_char_t *)"tag:yaml.org,2002:"}, {NULL, NULL} }; yaml_tag_directive_t *default_tag_directive; yaml_version_directive_t *version_directive = NULL; struct { yaml_tag_directive_t *start; yaml_tag_directive_t *end; yaml_tag_directive_t *top; } tag_directives = { NULL, NULL, NULL }; yaml_token_t *token; if (!STACK_INIT(parser, tag_directives, yaml_tag_directive_t*)) goto error; token = PEEK_TOKEN(parser); if (!token) goto error; while (token->type == YAML_VERSION_DIRECTIVE_TOKEN || token->type == YAML_TAG_DIRECTIVE_TOKEN) { if (token->type == YAML_VERSION_DIRECTIVE_TOKEN) { if (version_directive) { yaml_parser_set_parser_error(parser, "found duplicate %YAML directive", token->start_mark); goto error; } if (token->data.version_directive.major != 1 || ( token->data.version_directive.minor != 1 && token->data.version_directive.minor != 2 )) { yaml_parser_set_parser_error(parser, "found incompatible YAML document", token->start_mark); goto error; } version_directive = YAML_MALLOC_STATIC(yaml_version_directive_t); if (!version_directive) { parser->error = YAML_MEMORY_ERROR; goto error; } version_directive->major = token->data.version_directive.major; version_directive->minor = token->data.version_directive.minor; } else if (token->type == YAML_TAG_DIRECTIVE_TOKEN) { yaml_tag_directive_t value; value.handle = token->data.tag_directive.handle; value.prefix = token->data.tag_directive.prefix; if (!yaml_parser_append_tag_directive(parser, value, 0, token->start_mark)) goto error; if (!PUSH(parser, tag_directives, value)) goto error; } SKIP_TOKEN(parser); token = PEEK_TOKEN(parser); if (!token) goto error; } for (default_tag_directive = default_tag_directives; default_tag_directive->handle; default_tag_directive++) { if (!yaml_parser_append_tag_directive(parser, *default_tag_directive, 1, token->start_mark)) goto error; } if (version_directive_ref) { *version_directive_ref = version_directive; } if (tag_directives_start_ref) { if (STACK_EMPTY(parser, tag_directives)) { *tag_directives_start_ref = *tag_directives_end_ref = NULL; STACK_DEL(parser, tag_directives); } else { *tag_directives_start_ref = tag_directives.start; *tag_directives_end_ref = tag_directives.top; } } else { STACK_DEL(parser, tag_directives); } if (!version_directive_ref) yaml_free(version_directive); return 1; error: yaml_free(version_directive); while (!STACK_EMPTY(parser, tag_directives)) { yaml_tag_directive_t tag_directive = POP(parser, tag_directives); yaml_free(tag_directive.handle); yaml_free(tag_directive.prefix); } STACK_DEL(parser, tag_directives); return 0; } /* * Append a tag directive to the directives stack. */ static int yaml_parser_append_tag_directive(yaml_parser_t *parser, yaml_tag_directive_t value, int allow_duplicates, yaml_mark_t mark) { yaml_tag_directive_t *tag_directive; yaml_tag_directive_t copy = { NULL, NULL }; for (tag_directive = parser->tag_directives.start; tag_directive != parser->tag_directives.top; tag_directive ++) { if (strcmp((char *)value.handle, (char *)tag_directive->handle) == 0) { if (allow_duplicates) return 1; return yaml_parser_set_parser_error(parser, "found duplicate %TAG directive", mark); } } copy.handle = yaml_strdup(value.handle); copy.prefix = yaml_strdup(value.prefix); if (!copy.handle || !copy.prefix) { parser->error = YAML_MEMORY_ERROR; goto error; } if (!PUSH(parser, parser->tag_directives, copy)) goto error; return 1; error: yaml_free(copy.handle); yaml_free(copy.prefix); return 0; } /* * Declarations. */ static int yaml_parser_set_reader_error(yaml_parser_t *parser, const char *problem, size_t offset, int value); static int yaml_parser_update_raw_buffer(yaml_parser_t *parser); static int yaml_parser_determine_encoding(yaml_parser_t *parser); YAML_DECLARE(int) yaml_parser_update_buffer(yaml_parser_t *parser, size_t length); /* * Set the reader error and return 0. */ static int yaml_parser_set_reader_error(yaml_parser_t *parser, const char *problem, size_t offset, int value) { parser->error = YAML_READER_ERROR; parser->problem = problem; parser->problem_offset = offset; parser->problem_value = value; return 0; } /* * Byte order marks. */ #define BOM_UTF8 "\xef\xbb\xbf" #define BOM_UTF16LE "\xff\xfe" #define BOM_UTF16BE "\xfe\xff" /* * Determine the input stream encoding by checking the BOM symbol. If no BOM is * found, the UTF-8 encoding is assumed. Return 1 on success, 0 on failure. */ static int yaml_parser_determine_encoding(yaml_parser_t *parser) { /* Ensure that we had enough bytes in the raw buffer. */ while (!parser->eof && parser->raw_buffer.last - parser->raw_buffer.pointer < 3) { if (!yaml_parser_update_raw_buffer(parser)) { return 0; } } /* Determine the encoding. */ if (parser->raw_buffer.last - parser->raw_buffer.pointer >= 2 && !memcmp(parser->raw_buffer.pointer, BOM_UTF16LE, 2)) { parser->encoding = YAML_UTF16LE_ENCODING; parser->raw_buffer.pointer += 2; parser->offset += 2; } else if (parser->raw_buffer.last - parser->raw_buffer.pointer >= 2 && !memcmp(parser->raw_buffer.pointer, BOM_UTF16BE, 2)) { parser->encoding = YAML_UTF16BE_ENCODING; parser->raw_buffer.pointer += 2; parser->offset += 2; } else if (parser->raw_buffer.last - parser->raw_buffer.pointer >= 3 && !memcmp(parser->raw_buffer.pointer, BOM_UTF8, 3)) { parser->encoding = YAML_UTF8_ENCODING; parser->raw_buffer.pointer += 3; parser->offset += 3; } else { parser->encoding = YAML_UTF8_ENCODING; } return 1; } /* * Update the raw buffer. */ static int yaml_parser_update_raw_buffer(yaml_parser_t *parser) { size_t size_read = 0; /* Return if the raw buffer is full. */ if (parser->raw_buffer.start == parser->raw_buffer.pointer && parser->raw_buffer.last == parser->raw_buffer.end) return 1; /* Return on EOF. */ if (parser->eof) return 1; /* Move the remaining bytes in the raw buffer to the beginning. */ if (parser->raw_buffer.start < parser->raw_buffer.pointer && parser->raw_buffer.pointer < parser->raw_buffer.last) { memmove(parser->raw_buffer.start, parser->raw_buffer.pointer, parser->raw_buffer.last - parser->raw_buffer.pointer); } parser->raw_buffer.last -= parser->raw_buffer.pointer - parser->raw_buffer.start; parser->raw_buffer.pointer = parser->raw_buffer.start; /* Call the read handler to fill the buffer. */ if (!parser->read_handler(parser->read_handler_data, parser->raw_buffer.last, parser->raw_buffer.end - parser->raw_buffer.last, &size_read)) { return yaml_parser_set_reader_error(parser, "input error", parser->offset, -1); } parser->raw_buffer.last += size_read; if (!size_read) { parser->eof = 1; } return 1; } /* * Ensure that the buffer contains at least `length` characters. * Return 1 on success, 0 on failure. * * The length is supposed to be significantly less that the buffer size. */ YAML_DECLARE(int) yaml_parser_update_buffer(yaml_parser_t *parser, size_t length) { int first = 1; assert(parser->read_handler); /* Read handler must be set. */ /* If the EOF flag is set and the raw buffer is empty, do nothing. */ if (parser->eof && parser->raw_buffer.pointer == parser->raw_buffer.last) return 1; /* Return if the buffer contains enough characters. */ if (parser->unread >= length) return 1; /* Determine the input encoding if it is not known yet. */ if (!parser->encoding) { if (!yaml_parser_determine_encoding(parser)) return 0; } /* Move the unread characters to the beginning of the buffer. */ if (parser->buffer.start < parser->buffer.pointer && parser->buffer.pointer < parser->buffer.last) { size_t size = parser->buffer.last - parser->buffer.pointer; memmove(parser->buffer.start, parser->buffer.pointer, size); parser->buffer.pointer = parser->buffer.start; parser->buffer.last = parser->buffer.start + size; } else if (parser->buffer.pointer == parser->buffer.last) { parser->buffer.pointer = parser->buffer.start; parser->buffer.last = parser->buffer.start; } /* Fill the buffer until it has enough characters. */ while (parser->unread < length) { /* Fill the raw buffer if necessary. */ if (!first || parser->raw_buffer.pointer == parser->raw_buffer.last) { if (!yaml_parser_update_raw_buffer(parser)) return 0; } first = 0; /* Decode the raw buffer. */ while (parser->raw_buffer.pointer != parser->raw_buffer.last) { unsigned int value = 0, value2 = 0; int incomplete = 0; unsigned char octet; unsigned int width = 0; int low, high; size_t k; size_t raw_unread = parser->raw_buffer.last - parser->raw_buffer.pointer; /* Decode the next character. */ switch (parser->encoding) { case YAML_UTF8_ENCODING: /* * Decode a UTF-8 character. Check RFC 3629 * (http://www.ietf.org/rfc/rfc3629.txt) for more details. * * The following table (taken from the RFC) is used for * decoding. * * Char. number range | UTF-8 octet sequence * (hexadecimal) | (binary) * --------------------+------------------------------------ * 0000 0000-0000 007F | 0xxxxxxx * 0000 0080-0000 07FF | 110xxxxx 10xxxxxx * 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx * 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx * * Additionally, the characters in the range 0xD800-0xDFFF * are prohibited as they are reserved for use with UTF-16 * surrogate pairs. */ /* Determine the length of the UTF-8 sequence. */ octet = parser->raw_buffer.pointer[0]; width = (octet & 0x80) == 0x00 ? 1 : (octet & 0xE0) == 0xC0 ? 2 : (octet & 0xF0) == 0xE0 ? 3 : (octet & 0xF8) == 0xF0 ? 4 : 0; /* Check if the leading octet is valid. */ if (!width) return yaml_parser_set_reader_error(parser, "invalid leading UTF-8 octet", parser->offset, octet); /* Check if the raw buffer contains an incomplete character. */ if (width > raw_unread) { if (parser->eof) { return yaml_parser_set_reader_error(parser, "incomplete UTF-8 octet sequence", parser->offset, -1); } incomplete = 1; break; } /* Decode the leading octet. */ value = (octet & 0x80) == 0x00 ? octet & 0x7F : (octet & 0xE0) == 0xC0 ? octet & 0x1F : (octet & 0xF0) == 0xE0 ? octet & 0x0F : (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; /* Check and decode the trailing octets. */ for (k = 1; k < width; k ++) { octet = parser->raw_buffer.pointer[k]; /* Check if the octet is valid. */ if ((octet & 0xC0) != 0x80) return yaml_parser_set_reader_error(parser, "invalid trailing UTF-8 octet", parser->offset+k, octet); /* Decode the octet. */ value = (value << 6) + (octet & 0x3F); } /* Check the length of the sequence against the value. */ if (!((width == 1) || (width == 2 && value >= 0x80) || (width == 3 && value >= 0x800) || (width == 4 && value >= 0x10000))) return yaml_parser_set_reader_error(parser, "invalid length of a UTF-8 sequence", parser->offset, -1); /* Check the range of the value. */ if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) return yaml_parser_set_reader_error(parser, "invalid Unicode character", parser->offset, value); break; case YAML_UTF16LE_ENCODING: case YAML_UTF16BE_ENCODING: low = (parser->encoding == YAML_UTF16LE_ENCODING ? 0 : 1); high = (parser->encoding == YAML_UTF16LE_ENCODING ? 1 : 0); /* * The UTF-16 encoding is not as simple as one might * naively think. Check RFC 2781 * (http://www.ietf.org/rfc/rfc2781.txt). * * Normally, two subsequent bytes describe a Unicode * character. However a special technique (called a * surrogate pair) is used for specifying character * values larger than 0xFFFF. * * A surrogate pair consists of two pseudo-characters: * high surrogate area (0xD800-0xDBFF) * low surrogate area (0xDC00-0xDFFF) * * The following formulas are used for decoding * and encoding characters using surrogate pairs: * * U = U' + 0x10000 (0x01 00 00 <= U <= 0x10 FF FF) * U' = yyyyyyyyyyxxxxxxxxxx (0 <= U' <= 0x0F FF FF) * W1 = 110110yyyyyyyyyy * W2 = 110111xxxxxxxxxx * * where U is the character value, W1 is the high surrogate * area, W2 is the low surrogate area. */ /* Check for incomplete UTF-16 character. */ if (raw_unread < 2) { if (parser->eof) { return yaml_parser_set_reader_error(parser, "incomplete UTF-16 character", parser->offset, -1); } incomplete = 1; break; } /* Get the character. */ value = parser->raw_buffer.pointer[low] + (parser->raw_buffer.pointer[high] << 8); /* Check for unexpected low surrogate area. */ if ((value & 0xFC00) == 0xDC00) return yaml_parser_set_reader_error(parser, "unexpected low surrogate area", parser->offset, value); /* Check for a high surrogate area. */ if ((value & 0xFC00) == 0xD800) { width = 4; /* Check for incomplete surrogate pair. */ if (raw_unread < 4) { if (parser->eof) { return yaml_parser_set_reader_error(parser, "incomplete UTF-16 surrogate pair", parser->offset, -1); } incomplete = 1; break; } /* Get the next character. */ value2 = parser->raw_buffer.pointer[low+2] + (parser->raw_buffer.pointer[high+2] << 8); /* Check for a low surrogate area. */ if ((value2 & 0xFC00) != 0xDC00) return yaml_parser_set_reader_error(parser, "expected low surrogate area", parser->offset+2, value2); /* Generate the value of the surrogate pair. */ value = 0x10000 + ((value & 0x3FF) << 10) + (value2 & 0x3FF); } else { width = 2; } break; default: assert(1); /* Impossible. */ } /* Check if the raw buffer contains enough bytes to form a character. */ if (incomplete) break; /* * Check if the character is in the allowed range: * #x9 | #xA | #xD | [#x20-#x7E] (8 bit) * | #x85 | [#xA0-#xD7FF] | [#xE000-#xFFFD] (16 bit) * | [#x10000-#x10FFFF] (32 bit) */ if (! (value == 0x09 || value == 0x0A || value == 0x0D || (value >= 0x20 && value <= 0x7E) || (value == 0x85) || (value >= 0xA0 && value <= 0xD7FF) || (value >= 0xE000 && value <= 0xFFFD) || (value >= 0x10000 && value <= 0x10FFFF))) return yaml_parser_set_reader_error(parser, "control characters are not allowed", parser->offset, value); /* Move the raw pointers. */ parser->raw_buffer.pointer += width; parser->offset += width; /* Finally put the character into the buffer. */ /* 0000 0000-0000 007F -> 0xxxxxxx */ if (value <= 0x7F) { *(parser->buffer.last++) = value; } /* 0000 0080-0000 07FF -> 110xxxxx 10xxxxxx */ else if (value <= 0x7FF) { *(parser->buffer.last++) = 0xC0 + (value >> 6); *(parser->buffer.last++) = 0x80 + (value & 0x3F); } /* 0000 0800-0000 FFFF -> 1110xxxx 10xxxxxx 10xxxxxx */ else if (value <= 0xFFFF) { *(parser->buffer.last++) = 0xE0 + (value >> 12); *(parser->buffer.last++) = 0x80 + ((value >> 6) & 0x3F); *(parser->buffer.last++) = 0x80 + (value & 0x3F); } /* 0001 0000-0010 FFFF -> 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ else { *(parser->buffer.last++) = 0xF0 + (value >> 18); *(parser->buffer.last++) = 0x80 + ((value >> 12) & 0x3F); *(parser->buffer.last++) = 0x80 + ((value >> 6) & 0x3F); *(parser->buffer.last++) = 0x80 + (value & 0x3F); } parser->unread ++; } /* On EOF, put NUL into the buffer and return. */ if (parser->eof) { *(parser->buffer.last++) = '\0'; parser->unread ++; return 1; } } if (parser->offset >= MAX_FILE_SIZE) { return yaml_parser_set_reader_error(parser, "input is too long", parser->offset, -1); } return 1; } /* * Introduction * ************ * * The following notes assume that you are familiar with the YAML specification * (http://yaml.org/spec/cvs/current.html). We mostly follow it, although in * some cases we are less restrictive that it requires. * * The process of transforming a YAML stream into a sequence of events is * divided on two steps: Scanning and Parsing. * * The Scanner transforms the input stream into a sequence of tokens, while the * parser transform the sequence of tokens produced by the Scanner into a * sequence of parsing events. * * The Scanner is rather clever and complicated. The Parser, on the contrary, * is a straightforward implementation of a recursive-descendant parser (or, * LL(1) parser, as it is usually called). * * Actually there are two issues of Scanning that might be called "clever", the * rest is quite straightforward. The issues are "block collection start" and * "simple keys". Both issues are explained below in details. * * Here the Scanning step is explained and implemented. We start with the list * of all the tokens produced by the Scanner together with short descriptions. * * Now, tokens: * * STREAM-START(encoding) # The stream start. * STREAM-END # The stream end. * VERSION-DIRECTIVE(major,minor) # The '%YAML' directive. * TAG-DIRECTIVE(handle,prefix) # The '%TAG' directive. * DOCUMENT-START # '---' * DOCUMENT-END # '...' * BLOCK-SEQUENCE-START # Indentation increase denoting a block * BLOCK-MAPPING-START # sequence or a block mapping. * BLOCK-END # Indentation decrease. * FLOW-SEQUENCE-START # '[' * FLOW-SEQUENCE-END # ']' * FLOW-MAPPING-START # '{' * FLOW-MAPPING-END # '}' * BLOCK-ENTRY # '-' * FLOW-ENTRY # ',' * KEY # '?' or nothing (simple keys). * VALUE # ':' * ALIAS(anchor) # '*anchor' * ANCHOR(anchor) # '&anchor' * TAG(handle,suffix) # '!handle!suffix' * SCALAR(value,style) # A scalar. * * The following two tokens are "virtual" tokens denoting the beginning and the * end of the stream: * * STREAM-START(encoding) * STREAM-END * * We pass the information about the input stream encoding with the * STREAM-START token. * * The next two tokens are responsible for tags: * * VERSION-DIRECTIVE(major,minor) * TAG-DIRECTIVE(handle,prefix) * * Example: * * %YAML 1.1 * %TAG ! !foo * %TAG !yaml! tag:yaml.org,2002: * --- * * The corresponding sequence of tokens: * * STREAM-START(utf-8) * VERSION-DIRECTIVE(1,1) * TAG-DIRECTIVE("!","!foo") * TAG-DIRECTIVE("!yaml","tag:yaml.org,2002:") * DOCUMENT-START * STREAM-END * * Note that the VERSION-DIRECTIVE and TAG-DIRECTIVE tokens occupy a whole * line. * * The document start and end indicators are represented by: * * DOCUMENT-START * DOCUMENT-END * * Note that if a YAML stream contains an implicit document (without '---' * and '...' indicators), no DOCUMENT-START and DOCUMENT-END tokens will be * produced. * * In the following examples, we present whole documents together with the * produced tokens. * * 1. An implicit document: * * 'a scalar' * * Tokens: * * STREAM-START(utf-8) * SCALAR("a scalar",single-quoted) * STREAM-END * * 2. An explicit document: * * --- * 'a scalar' * ... * * Tokens: * * STREAM-START(utf-8) * DOCUMENT-START * SCALAR("a scalar",single-quoted) * DOCUMENT-END * STREAM-END * * 3. Several documents in a stream: * * 'a scalar' * --- * 'another scalar' * --- * 'yet another scalar' * * Tokens: * * STREAM-START(utf-8) * SCALAR("a scalar",single-quoted) * DOCUMENT-START * SCALAR("another scalar",single-quoted) * DOCUMENT-START * SCALAR("yet another scalar",single-quoted) * STREAM-END * * We have already introduced the SCALAR token above. The following tokens are * used to describe aliases, anchors, tag, and scalars: * * ALIAS(anchor) * ANCHOR(anchor) * TAG(handle,suffix) * SCALAR(value,style) * * The following series of examples illustrate the usage of these tokens: * * 1. A recursive sequence: * * &A [ *A ] * * Tokens: * * STREAM-START(utf-8) * ANCHOR("A") * FLOW-SEQUENCE-START * ALIAS("A") * FLOW-SEQUENCE-END * STREAM-END * * 2. A tagged scalar: * * !!float "3.14" # A good approximation. * * Tokens: * * STREAM-START(utf-8) * TAG("!!","float") * SCALAR("3.14",double-quoted) * STREAM-END * * 3. Various scalar styles: * * --- # Implicit empty plain scalars do not produce tokens. * --- a plain scalar * --- 'a single-quoted scalar' * --- "a double-quoted scalar" * --- |- * a literal scalar * --- >- * a folded * scalar * * Tokens: * * STREAM-START(utf-8) * DOCUMENT-START * DOCUMENT-START * SCALAR("a plain scalar",plain) * DOCUMENT-START * SCALAR("a single-quoted scalar",single-quoted) * DOCUMENT-START * SCALAR("a double-quoted scalar",double-quoted) * DOCUMENT-START * SCALAR("a literal scalar",literal) * DOCUMENT-START * SCALAR("a folded scalar",folded) * STREAM-END * * Now it's time to review collection-related tokens. We will start with * flow collections: * * FLOW-SEQUENCE-START * FLOW-SEQUENCE-END * FLOW-MAPPING-START * FLOW-MAPPING-END * FLOW-ENTRY * KEY * VALUE * * The tokens FLOW-SEQUENCE-START, FLOW-SEQUENCE-END, FLOW-MAPPING-START, and * FLOW-MAPPING-END represent the indicators '[', ']', '{', and '}' * correspondingly. FLOW-ENTRY represent the ',' indicator. Finally the * indicators '?' and ':', which are used for denoting mapping keys and values, * are represented by the KEY and VALUE tokens. * * The following examples show flow collections: * * 1. A flow sequence: * * [item 1, item 2, item 3] * * Tokens: * * STREAM-START(utf-8) * FLOW-SEQUENCE-START * SCALAR("item 1",plain) * FLOW-ENTRY * SCALAR("item 2",plain) * FLOW-ENTRY * SCALAR("item 3",plain) * FLOW-SEQUENCE-END * STREAM-END * * 2. A flow mapping: * * { * a simple key: a value, # Note that the KEY token is produced. * ? a complex key: another value, * } * * Tokens: * * STREAM-START(utf-8) * FLOW-MAPPING-START * KEY * SCALAR("a simple key",plain) * VALUE * SCALAR("a value",plain) * FLOW-ENTRY * KEY * SCALAR("a complex key",plain) * VALUE * SCALAR("another value",plain) * FLOW-ENTRY * FLOW-MAPPING-END * STREAM-END * * A simple key is a key which is not denoted by the '?' indicator. Note that * the Scanner still produce the KEY token whenever it encounters a simple key. * * For scanning block collections, the following tokens are used (note that we * repeat KEY and VALUE here): * * BLOCK-SEQUENCE-START * BLOCK-MAPPING-START * BLOCK-END * BLOCK-ENTRY * KEY * VALUE * * The tokens BLOCK-SEQUENCE-START and BLOCK-MAPPING-START denote indentation * increase that precedes a block collection (cf. the INDENT token in Python). * The token BLOCK-END denote indentation decrease that ends a block collection * (cf. the DEDENT token in Python). However YAML has some syntax pecularities * that makes detections of these tokens more complex. * * The tokens BLOCK-ENTRY, KEY, and VALUE are used to represent the indicators * '-', '?', and ':' correspondingly. * * The following examples show how the tokens BLOCK-SEQUENCE-START, * BLOCK-MAPPING-START, and BLOCK-END are emitted by the Scanner: * * 1. Block sequences: * * - item 1 * - item 2 * - * - item 3.1 * - item 3.2 * - * key 1: value 1 * key 2: value 2 * * Tokens: * * STREAM-START(utf-8) * BLOCK-SEQUENCE-START * BLOCK-ENTRY * SCALAR("item 1",plain) * BLOCK-ENTRY * SCALAR("item 2",plain) * BLOCK-ENTRY * BLOCK-SEQUENCE-START * BLOCK-ENTRY * SCALAR("item 3.1",plain) * BLOCK-ENTRY * SCALAR("item 3.2",plain) * BLOCK-END * BLOCK-ENTRY * BLOCK-MAPPING-START * KEY * SCALAR("key 1",plain) * VALUE * SCALAR("value 1",plain) * KEY * SCALAR("key 2",plain) * VALUE * SCALAR("value 2",plain) * BLOCK-END * BLOCK-END * STREAM-END * * 2. Block mappings: * * a simple key: a value # The KEY token is produced here. * ? a complex key * : another value * a mapping: * key 1: value 1 * key 2: value 2 * a sequence: * - item 1 * - item 2 * * Tokens: * * STREAM-START(utf-8) * BLOCK-MAPPING-START * KEY * SCALAR("a simple key",plain) * VALUE * SCALAR("a value",plain) * KEY * SCALAR("a complex key",plain) * VALUE * SCALAR("another value",plain) * KEY * SCALAR("a mapping",plain) * VALUE * BLOCK-MAPPING-START * KEY * SCALAR("key 1",plain) * VALUE * SCALAR("value 1",plain) * KEY * SCALAR("key 2",plain) * VALUE * SCALAR("value 2",plain) * BLOCK-END * KEY * SCALAR("a sequence",plain) * VALUE * BLOCK-SEQUENCE-START * BLOCK-ENTRY * SCALAR("item 1",plain) * BLOCK-ENTRY * SCALAR("item 2",plain) * BLOCK-END * BLOCK-END * STREAM-END * * YAML does not always require to start a new block collection from a new * line. If the current line contains only '-', '?', and ':' indicators, a new * block collection may start at the current line. The following examples * illustrate this case: * * 1. Collections in a sequence: * * - - item 1 * - item 2 * - key 1: value 1 * key 2: value 2 * - ? complex key * : complex value * * Tokens: * * STREAM-START(utf-8) * BLOCK-SEQUENCE-START * BLOCK-ENTRY * BLOCK-SEQUENCE-START * BLOCK-ENTRY * SCALAR("item 1",plain) * BLOCK-ENTRY * SCALAR("item 2",plain) * BLOCK-END * BLOCK-ENTRY * BLOCK-MAPPING-START * KEY * SCALAR("key 1",plain) * VALUE * SCALAR("value 1",plain) * KEY * SCALAR("key 2",plain) * VALUE * SCALAR("value 2",plain) * BLOCK-END * BLOCK-ENTRY * BLOCK-MAPPING-START * KEY * SCALAR("complex key") * VALUE * SCALAR("complex value") * BLOCK-END * BLOCK-END * STREAM-END * * 2. Collections in a mapping: * * ? a sequence * : - item 1 * - item 2 * ? a mapping * : key 1: value 1 * key 2: value 2 * * Tokens: * * STREAM-START(utf-8) * BLOCK-MAPPING-START * KEY * SCALAR("a sequence",plain) * VALUE * BLOCK-SEQUENCE-START * BLOCK-ENTRY * SCALAR("item 1",plain) * BLOCK-ENTRY * SCALAR("item 2",plain) * BLOCK-END * KEY * SCALAR("a mapping",plain) * VALUE * BLOCK-MAPPING-START * KEY * SCALAR("key 1",plain) * VALUE * SCALAR("value 1",plain) * KEY * SCALAR("key 2",plain) * VALUE * SCALAR("value 2",plain) * BLOCK-END * BLOCK-END * STREAM-END * * YAML also permits non-indented sequences if they are included into a block * mapping. In this case, the token BLOCK-SEQUENCE-START is not produced: * * key: * - item 1 # BLOCK-SEQUENCE-START is NOT produced here. * - item 2 * * Tokens: * * STREAM-START(utf-8) * BLOCK-MAPPING-START * KEY * SCALAR("key",plain) * VALUE * BLOCK-ENTRY * SCALAR("item 1",plain) * BLOCK-ENTRY * SCALAR("item 2",plain) * BLOCK-END */ /* * Ensure that the buffer contains the required number of characters. * Return 1 on success, 0 on failure (reader error or memory error). */ #define CACHE(parser,length) \ (parser->unread >= (length) \ ? 1 \ : yaml_parser_update_buffer(parser, (length))) /* * Advance the buffer pointer. */ #define SKIP(parser) \ (parser->mark.index ++, \ parser->mark.column ++, \ parser->unread --, \ parser->buffer.pointer += WIDTH(parser->buffer)) #define SKIP_LINE(parser) \ (IS_CRLF(parser->buffer) ? \ (parser->mark.index += 2, \ parser->mark.column = 0, \ parser->mark.line ++, \ parser->unread -= 2, \ parser->buffer.pointer += 2) : \ IS_BREAK(parser->buffer) ? \ (parser->mark.index ++, \ parser->mark.column = 0, \ parser->mark.line ++, \ parser->unread --, \ parser->buffer.pointer += WIDTH(parser->buffer)) : 0) /* * Copy a character to a string buffer and advance pointers. */ #define READ(parser,string) \ (STRING_EXTEND(parser,string) ? \ (COPY(string,parser->buffer), \ parser->mark.index ++, \ parser->mark.column ++, \ parser->unread --, \ 1) : 0) /* * Copy a line break character to a string buffer and advance pointers. */ #define READ_LINE(parser,string) \ (STRING_EXTEND(parser,string) ? \ (((CHECK_AT(parser->buffer,'\r',0) \ && CHECK_AT(parser->buffer,'\n',1)) ? /* CR LF -> LF */ \ (*((string).pointer++) = (yaml_char_t) '\n', \ parser->buffer.pointer += 2, \ parser->mark.index += 2, \ parser->mark.column = 0, \ parser->mark.line ++, \ parser->unread -= 2) : \ (CHECK_AT(parser->buffer,'\r',0) \ || CHECK_AT(parser->buffer,'\n',0)) ? /* CR|LF -> LF */ \ (*((string).pointer++) = (yaml_char_t) '\n', \ parser->buffer.pointer ++, \ parser->mark.index ++, \ parser->mark.column = 0, \ parser->mark.line ++, \ parser->unread --) : \ (CHECK_AT(parser->buffer,'\xC2',0) \ && CHECK_AT(parser->buffer,'\x85',1)) ? /* NEL -> LF */ \ (*((string).pointer++) = (yaml_char_t) '\n', \ parser->buffer.pointer += 2, \ parser->mark.index ++, \ parser->mark.column = 0, \ parser->mark.line ++, \ parser->unread --) : \ (CHECK_AT(parser->buffer,'\xE2',0) && \ CHECK_AT(parser->buffer,'\x80',1) && \ (CHECK_AT(parser->buffer,'\xA8',2) || \ CHECK_AT(parser->buffer,'\xA9',2))) ? /* LS|PS -> LS|PS */ \ (*((string).pointer++) = *(parser->buffer.pointer++), \ *((string).pointer++) = *(parser->buffer.pointer++), \ *((string).pointer++) = *(parser->buffer.pointer++), \ parser->mark.index ++, \ parser->mark.column = 0, \ parser->mark.line ++, \ parser->unread --) : 0), \ 1) : 0) /* * Public API declarations. */ YAML_DECLARE(int) yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token); /* * Error handling. */ static int yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context, yaml_mark_t context_mark, const char *problem); /* * High-level token API. */ YAML_DECLARE(int) yaml_parser_fetch_more_tokens(yaml_parser_t *parser); static int yaml_parser_fetch_next_token(yaml_parser_t *parser); /* * Potential simple keys. */ static int yaml_parser_stale_simple_keys(yaml_parser_t *parser); static int yaml_parser_save_simple_key(yaml_parser_t *parser); static int yaml_parser_remove_simple_key(yaml_parser_t *parser); static int yaml_parser_increase_flow_level(yaml_parser_t *parser); static int yaml_parser_decrease_flow_level(yaml_parser_t *parser); /* * Indentation treatment. */ static int yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column, ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark); static int yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column); /* * Token fetchers. */ static int yaml_parser_fetch_stream_start(yaml_parser_t *parser); static int yaml_parser_fetch_stream_end(yaml_parser_t *parser); static int yaml_parser_fetch_directive(yaml_parser_t *parser); static int yaml_parser_fetch_document_indicator(yaml_parser_t *parser, yaml_token_type_t type); static int yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser, yaml_token_type_t type); static int yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser, yaml_token_type_t type); static int yaml_parser_fetch_flow_entry(yaml_parser_t *parser); static int yaml_parser_fetch_block_entry(yaml_parser_t *parser); static int yaml_parser_fetch_key(yaml_parser_t *parser); static int yaml_parser_fetch_value(yaml_parser_t *parser); static int yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type); static int yaml_parser_fetch_tag(yaml_parser_t *parser); static int yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal); static int yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single); static int yaml_parser_fetch_plain_scalar(yaml_parser_t *parser); /* * Token scanners. */ static int yaml_parser_scan_to_next_token(yaml_parser_t *parser); static int yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token); static int yaml_parser_scan_directive_name(yaml_parser_t *parser, yaml_mark_t start_mark, yaml_char_t **name); static int yaml_parser_scan_version_directive_value(yaml_parser_t *parser, yaml_mark_t start_mark, int *major, int *minor); static int yaml_parser_scan_version_directive_number(yaml_parser_t *parser, yaml_mark_t start_mark, int *number); static int yaml_parser_scan_tag_directive_value(yaml_parser_t *parser, yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix); static int yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token, yaml_token_type_t type); static int yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token); static int yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive, yaml_mark_t start_mark, yaml_char_t **handle); static int yaml_parser_scan_tag_uri(yaml_parser_t *parser, int uri_char, int directive, yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri); static int yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive, yaml_mark_t start_mark, yaml_string_t *string); static int yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token, int literal); static int yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser, int *indent, yaml_string_t *breaks, yaml_mark_t start_mark, yaml_mark_t *end_mark); static int yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token, int single); static int yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token); /* * Get the next token. */ YAML_DECLARE(int) yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token) { assert(parser); /* Non-NULL parser object is expected. */ assert(token); /* Non-NULL token object is expected. */ /* Erase the token object. */ memset(token, 0, sizeof(yaml_token_t)); /* No tokens after STREAM-END or error. */ if (parser->stream_end_produced || parser->error) { return 1; } /* Ensure that the tokens queue contains enough tokens. */ if (!parser->token_available) { if (!yaml_parser_fetch_more_tokens(parser)) return 0; } /* Fetch the next token from the queue. */ *token = DEQUEUE(parser, parser->tokens); parser->token_available = 0; parser->tokens_parsed ++; if (token->type == YAML_STREAM_END_TOKEN) { parser->stream_end_produced = 1; } return 1; } /* * Set the scanner error and return 0. */ static int yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context, yaml_mark_t context_mark, const char *problem) { parser->error = YAML_SCANNER_ERROR; parser->context = context; parser->context_mark = context_mark; parser->problem = problem; parser->problem_mark = parser->mark; return 0; } /* * Ensure that the tokens queue contains at least one token which can be * returned to the Parser. */ YAML_DECLARE(int) yaml_parser_fetch_more_tokens(yaml_parser_t *parser) { int need_more_tokens; /* While we need more tokens to fetch, do it. */ while (1) { /* * Check if we really need to fetch more tokens. */ need_more_tokens = 0; if (parser->tokens.head == parser->tokens.tail) { /* Queue is empty. */ need_more_tokens = 1; } else { yaml_simple_key_t *simple_key; /* Check if any potential simple key may occupy the head position. */ if (!yaml_parser_stale_simple_keys(parser)) return 0; for (simple_key = parser->simple_keys.start; simple_key != parser->simple_keys.top; simple_key++) { if (simple_key->possible && simple_key->token_number == parser->tokens_parsed) { need_more_tokens = 1; break; } } } /* We are finished. */ if (!need_more_tokens) break; /* Fetch the next token. */ if (!yaml_parser_fetch_next_token(parser)) return 0; } parser->token_available = 1; return 1; } /* * The dispatcher for token fetchers. */ static int yaml_parser_fetch_next_token(yaml_parser_t *parser) { /* Ensure that the buffer is initialized. */ if (!CACHE(parser, 1)) return 0; /* Check if we just started scanning. Fetch STREAM-START then. */ if (!parser->stream_start_produced) return yaml_parser_fetch_stream_start(parser); /* Eat whitespaces and comments until we reach the next token. */ if (!yaml_parser_scan_to_next_token(parser)) return 0; /* Remove obsolete potential simple keys. */ if (!yaml_parser_stale_simple_keys(parser)) return 0; /* Check the indentation level against the current column. */ if (!yaml_parser_unroll_indent(parser, parser->mark.column)) return 0; /* * Ensure that the buffer contains at least 4 characters. 4 is the length * of the longest indicators ('--- ' and '... '). */ if (!CACHE(parser, 4)) return 0; /* Is it the end of the stream? */ if (IS_Z(parser->buffer)) return yaml_parser_fetch_stream_end(parser); /* Is it a directive? */ if (parser->mark.column == 0 && CHECK(parser->buffer, '%')) return yaml_parser_fetch_directive(parser); /* Is it the document start indicator? */ if (parser->mark.column == 0 && CHECK_AT(parser->buffer, '-', 0) && CHECK_AT(parser->buffer, '-', 1) && CHECK_AT(parser->buffer, '-', 2) && IS_BLANKZ_AT(parser->buffer, 3)) return yaml_parser_fetch_document_indicator(parser, YAML_DOCUMENT_START_TOKEN); /* Is it the document end indicator? */ if (parser->mark.column == 0 && CHECK_AT(parser->buffer, '.', 0) && CHECK_AT(parser->buffer, '.', 1) && CHECK_AT(parser->buffer, '.', 2) && IS_BLANKZ_AT(parser->buffer, 3)) return yaml_parser_fetch_document_indicator(parser, YAML_DOCUMENT_END_TOKEN); /* Is it the flow sequence start indicator? */ if (CHECK(parser->buffer, '[')) return yaml_parser_fetch_flow_collection_start(parser, YAML_FLOW_SEQUENCE_START_TOKEN); /* Is it the flow mapping start indicator? */ if (CHECK(parser->buffer, '{')) return yaml_parser_fetch_flow_collection_start(parser, YAML_FLOW_MAPPING_START_TOKEN); /* Is it the flow sequence end indicator? */ if (CHECK(parser->buffer, ']')) return yaml_parser_fetch_flow_collection_end(parser, YAML_FLOW_SEQUENCE_END_TOKEN); /* Is it the flow mapping end indicator? */ if (CHECK(parser->buffer, '}')) return yaml_parser_fetch_flow_collection_end(parser, YAML_FLOW_MAPPING_END_TOKEN); /* Is it the flow entry indicator? */ if (CHECK(parser->buffer, ',')) return yaml_parser_fetch_flow_entry(parser); /* Is it the block entry indicator? */ if (CHECK(parser->buffer, '-') && IS_BLANKZ_AT(parser->buffer, 1)) return yaml_parser_fetch_block_entry(parser); /* Is it the key indicator? */ if (CHECK(parser->buffer, '?') && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1))) return yaml_parser_fetch_key(parser); /* Is it the value indicator? */ if (CHECK(parser->buffer, ':') && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1))) return yaml_parser_fetch_value(parser); /* Is it an alias? */ if (CHECK(parser->buffer, '*')) return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN); /* Is it an anchor? */ if (CHECK(parser->buffer, '&')) return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN); /* Is it a tag? */ if (CHECK(parser->buffer, '!')) return yaml_parser_fetch_tag(parser); /* Is it a literal scalar? */ if (CHECK(parser->buffer, '|') && !parser->flow_level) return yaml_parser_fetch_block_scalar(parser, 1); /* Is it a folded scalar? */ if (CHECK(parser->buffer, '>') && !parser->flow_level) return yaml_parser_fetch_block_scalar(parser, 0); /* Is it a single-quoted scalar? */ if (CHECK(parser->buffer, '\'')) return yaml_parser_fetch_flow_scalar(parser, 1); /* Is it a double-quoted scalar? */ if (CHECK(parser->buffer, '"')) return yaml_parser_fetch_flow_scalar(parser, 0); /* * Is it a plain scalar? * * A plain scalar may start with any non-blank characters except * * '-', '?', ':', ',', '[', ']', '{', '}', * '#', '&', '*', '!', '|', '>', '\'', '\"', * '%', '@', '`'. * * In the block context (and, for the '-' indicator, in the flow context * too), it may also start with the characters * * '-', '?', ':' * * if it is followed by a non-space character. * * The last rule is more restrictive than the specification requires. */ if (!(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '-') || CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{') || CHECK(parser->buffer, '}') || CHECK(parser->buffer, '#') || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '|') || CHECK(parser->buffer, '>') || CHECK(parser->buffer, '\'') || CHECK(parser->buffer, '"') || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@') || CHECK(parser->buffer, '`')) || (CHECK(parser->buffer, '-') && !IS_BLANK_AT(parser->buffer, 1)) || (!parser->flow_level && (CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':')) && !IS_BLANKZ_AT(parser->buffer, 1))) return yaml_parser_fetch_plain_scalar(parser); /* * If we don't determine the token type so far, it is an error. */ return yaml_parser_set_scanner_error(parser, "while scanning for the next token", parser->mark, "found character that cannot start any token"); } /* * Check the list of potential simple keys and remove the positions that * cannot contain simple keys anymore. */ static int yaml_parser_stale_simple_keys(yaml_parser_t *parser) { yaml_simple_key_t *simple_key; /* Check for a potential simple key for each flow level. */ for (simple_key = parser->simple_keys.start; simple_key != parser->simple_keys.top; simple_key ++) { /* * The specification requires that a simple key * * - is limited to a single line, * - is shorter than 1024 characters. */ if (simple_key->possible && (simple_key->mark.line < parser->mark.line || simple_key->mark.index+1024 < parser->mark.index)) { /* Check if the potential simple key to be removed is required. */ if (simple_key->required) { return yaml_parser_set_scanner_error(parser, "while scanning a simple key", simple_key->mark, "could not find expected ':'"); } simple_key->possible = 0; } } return 1; } /* * Check if a simple key may start at the current position and add it if * needed. */ static int yaml_parser_save_simple_key(yaml_parser_t *parser) { /* * A simple key is required at the current position if the scanner is in * the block context and the current column coincides with the indentation * level. */ int required = (!parser->flow_level && parser->indent == (ptrdiff_t)parser->mark.column); /* * If the current position may start a simple key, save it. */ if (parser->simple_key_allowed) { yaml_simple_key_t simple_key; simple_key.possible = 1; simple_key.required = required; simple_key.token_number = parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head); simple_key.mark = parser->mark; if (!yaml_parser_remove_simple_key(parser)) return 0; *(parser->simple_keys.top-1) = simple_key; } return 1; } /* * Remove a potential simple key at the current flow level. */ static int yaml_parser_remove_simple_key(yaml_parser_t *parser) { yaml_simple_key_t *simple_key = parser->simple_keys.top-1; if (simple_key->possible) { /* If the key is required, it is an error. */ if (simple_key->required) { return yaml_parser_set_scanner_error(parser, "while scanning a simple key", simple_key->mark, "could not find expected ':'"); } } /* Remove the key from the stack. */ simple_key->possible = 0; return 1; } /* * Increase the flow level and resize the simple key list if needed. */ static int yaml_parser_increase_flow_level(yaml_parser_t *parser) { yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } }; /* Reset the simple key on the next level. */ if (!PUSH(parser, parser->simple_keys, empty_simple_key)) return 0; /* Increase the flow level. */ if (parser->flow_level == INT_MAX) { parser->error = YAML_MEMORY_ERROR; return 0; } parser->flow_level++; return 1; } /* * Decrease the flow level. */ static int yaml_parser_decrease_flow_level(yaml_parser_t *parser) { if (parser->flow_level) { parser->flow_level --; (void)POP(parser, parser->simple_keys); } return 1; } /* * Push the current indentation level to the stack and set the new level * the current column is greater than the indentation level. In this case, * append or insert the specified token into the token queue. * */ static int yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column, ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark) { yaml_token_t token; /* In the flow context, do nothing. */ if (parser->flow_level) return 1; if (parser->indent < column) { /* * Push the current indentation level to the stack and set the new * indentation level. */ if (!PUSH(parser, parser->indents, parser->indent)) return 0; if (column > INT_MAX) { parser->error = YAML_MEMORY_ERROR; return 0; } parser->indent = column; /* Create a token and insert it into the queue. */ TOKEN_INIT(token, type, mark, mark); if (number == -1) { if (!ENQUEUE(parser, parser->tokens, token)) return 0; } else { if (!QUEUE_INSERT(parser, parser->tokens, number - parser->tokens_parsed, token)) return 0; } } return 1; } /* * Pop indentation levels from the indents stack until the current level * becomes less or equal to the column. For each indentation level, append * the BLOCK-END token. */ static int yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column) { yaml_token_t token; /* In the flow context, do nothing. */ if (parser->flow_level) return 1; /* Loop through the indentation levels in the stack. */ while (parser->indent > column) { /* Create a token and append it to the queue. */ TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark); if (!ENQUEUE(parser, parser->tokens, token)) return 0; /* Pop the indentation level. */ parser->indent = POP(parser, parser->indents); } return 1; } /* * Initialize the scanner and produce the STREAM-START token. */ static int yaml_parser_fetch_stream_start(yaml_parser_t *parser) { yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } }; yaml_token_t token; /* Set the initial indentation. */ parser->indent = -1; /* Initialize the simple key stack. */ if (!PUSH(parser, parser->simple_keys, simple_key)) return 0; /* A simple key is allowed at the beginning of the stream. */ parser->simple_key_allowed = 1; /* We have started. */ parser->stream_start_produced = 1; /* Create the STREAM-START token and append it to the queue. */ STREAM_START_TOKEN_INIT(token, parser->encoding, parser->mark, parser->mark); if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce the STREAM-END token and shut down the scanner. */ static int yaml_parser_fetch_stream_end(yaml_parser_t *parser) { yaml_token_t token; /* Force new line. */ if (parser->mark.column != 0) { parser->mark.column = 0; parser->mark.line ++; } /* Reset the indentation level. */ if (!yaml_parser_unroll_indent(parser, -1)) return 0; /* Reset simple keys. */ if (!yaml_parser_remove_simple_key(parser)) return 0; parser->simple_key_allowed = 0; /* Create the STREAM-END token and append it to the queue. */ STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark); if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token. */ static int yaml_parser_fetch_directive(yaml_parser_t *parser) { yaml_token_t token; /* Reset the indentation level. */ if (!yaml_parser_unroll_indent(parser, -1)) return 0; /* Reset simple keys. */ if (!yaml_parser_remove_simple_key(parser)) return 0; parser->simple_key_allowed = 0; /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */ if (!yaml_parser_scan_directive(parser, &token)) return 0; /* Append the token to the queue. */ if (!ENQUEUE(parser, parser->tokens, token)) { yaml_token_delete(&token); return 0; } return 1; } /* * Produce the DOCUMENT-START or DOCUMENT-END token. */ static int yaml_parser_fetch_document_indicator(yaml_parser_t *parser, yaml_token_type_t type) { yaml_mark_t start_mark, end_mark; yaml_token_t token; /* Reset the indentation level. */ if (!yaml_parser_unroll_indent(parser, -1)) return 0; /* Reset simple keys. */ if (!yaml_parser_remove_simple_key(parser)) return 0; parser->simple_key_allowed = 0; /* Consume the token. */ start_mark = parser->mark; SKIP(parser); SKIP(parser); SKIP(parser); end_mark = parser->mark; /* Create the DOCUMENT-START or DOCUMENT-END token. */ TOKEN_INIT(token, type, start_mark, end_mark); /* Append the token to the queue. */ if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token. */ static int yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser, yaml_token_type_t type) { yaml_mark_t start_mark, end_mark; yaml_token_t token; /* The indicators '[' and '{' may start a simple key. */ if (!yaml_parser_save_simple_key(parser)) return 0; /* Increase the flow level. */ if (!yaml_parser_increase_flow_level(parser)) return 0; /* A simple key may follow the indicators '[' and '{'. */ parser->simple_key_allowed = 1; /* Consume the token. */ start_mark = parser->mark; SKIP(parser); end_mark = parser->mark; /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */ TOKEN_INIT(token, type, start_mark, end_mark); /* Append the token to the queue. */ if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token. */ static int yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser, yaml_token_type_t type) { yaml_mark_t start_mark, end_mark; yaml_token_t token; /* Reset any potential simple key on the current flow level. */ if (!yaml_parser_remove_simple_key(parser)) return 0; /* Decrease the flow level. */ if (!yaml_parser_decrease_flow_level(parser)) return 0; /* No simple keys after the indicators ']' and '}'. */ parser->simple_key_allowed = 0; /* Consume the token. */ start_mark = parser->mark; SKIP(parser); end_mark = parser->mark; /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */ TOKEN_INIT(token, type, start_mark, end_mark); /* Append the token to the queue. */ if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce the FLOW-ENTRY token. */ static int yaml_parser_fetch_flow_entry(yaml_parser_t *parser) { yaml_mark_t start_mark, end_mark; yaml_token_t token; /* Reset any potential simple keys on the current flow level. */ if (!yaml_parser_remove_simple_key(parser)) return 0; /* Simple keys are allowed after ','. */ parser->simple_key_allowed = 1; /* Consume the token. */ start_mark = parser->mark; SKIP(parser); end_mark = parser->mark; /* Create the FLOW-ENTRY token and append it to the queue. */ TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark); if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce the BLOCK-ENTRY token. */ static int yaml_parser_fetch_block_entry(yaml_parser_t *parser) { yaml_mark_t start_mark, end_mark; yaml_token_t token; /* Check if the scanner is in the block context. */ if (!parser->flow_level) { /* Check if we are allowed to start a new entry. */ if (!parser->simple_key_allowed) { return yaml_parser_set_scanner_error(parser, NULL, parser->mark, "block sequence entries are not allowed in this context"); } /* Add the BLOCK-SEQUENCE-START token if needed. */ if (!yaml_parser_roll_indent(parser, parser->mark.column, -1, YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark)) return 0; } else { /* * It is an error for the '-' indicator to occur in the flow context, * but we let the Parser detect and report about it because the Parser * is able to point to the context. */ } /* Reset any potential simple keys on the current flow level. */ if (!yaml_parser_remove_simple_key(parser)) return 0; /* Simple keys are allowed after '-'. */ parser->simple_key_allowed = 1; /* Consume the token. */ start_mark = parser->mark; SKIP(parser); end_mark = parser->mark; /* Create the BLOCK-ENTRY token and append it to the queue. */ TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark); if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce the KEY token. */ static int yaml_parser_fetch_key(yaml_parser_t *parser) { yaml_mark_t start_mark, end_mark; yaml_token_t token; /* In the block context, additional checks are required. */ if (!parser->flow_level) { /* Check if we are allowed to start a new key (not necessary simple). */ if (!parser->simple_key_allowed) { return yaml_parser_set_scanner_error(parser, NULL, parser->mark, "mapping keys are not allowed in this context"); } /* Add the BLOCK-MAPPING-START token if needed. */ if (!yaml_parser_roll_indent(parser, parser->mark.column, -1, YAML_BLOCK_MAPPING_START_TOKEN, parser->mark)) return 0; } /* Reset any potential simple keys on the current flow level. */ if (!yaml_parser_remove_simple_key(parser)) return 0; /* Simple keys are allowed after '?' in the block context. */ parser->simple_key_allowed = (!parser->flow_level); /* Consume the token. */ start_mark = parser->mark; SKIP(parser); end_mark = parser->mark; /* Create the KEY token and append it to the queue. */ TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark); if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce the VALUE token. */ static int yaml_parser_fetch_value(yaml_parser_t *parser) { yaml_mark_t start_mark, end_mark; yaml_token_t token; yaml_simple_key_t *simple_key = parser->simple_keys.top-1; /* Have we found a simple key? */ if (simple_key->possible) { /* Create the KEY token and insert it into the queue. */ TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark); if (!QUEUE_INSERT(parser, parser->tokens, simple_key->token_number - parser->tokens_parsed, token)) return 0; /* In the block context, we may need to add the BLOCK-MAPPING-START token. */ if (!yaml_parser_roll_indent(parser, simple_key->mark.column, simple_key->token_number, YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark)) return 0; /* Remove the simple key. */ simple_key->possible = 0; /* A simple key cannot follow another simple key. */ parser->simple_key_allowed = 0; } else { /* The ':' indicator follows a complex key. */ /* In the block context, extra checks are required. */ if (!parser->flow_level) { /* Check if we are allowed to start a complex value. */ if (!parser->simple_key_allowed) { return yaml_parser_set_scanner_error(parser, NULL, parser->mark, "mapping values are not allowed in this context"); } /* Add the BLOCK-MAPPING-START token if needed. */ if (!yaml_parser_roll_indent(parser, parser->mark.column, -1, YAML_BLOCK_MAPPING_START_TOKEN, parser->mark)) return 0; } /* Simple keys after ':' are allowed in the block context. */ parser->simple_key_allowed = (!parser->flow_level); } /* Consume the token. */ start_mark = parser->mark; SKIP(parser); end_mark = parser->mark; /* Create the VALUE token and append it to the queue. */ TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark); if (!ENQUEUE(parser, parser->tokens, token)) return 0; return 1; } /* * Produce the ALIAS or ANCHOR token. */ static int yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type) { yaml_token_t token; /* An anchor or an alias could be a simple key. */ if (!yaml_parser_save_simple_key(parser)) return 0; /* A simple key cannot follow an anchor or an alias. */ parser->simple_key_allowed = 0; /* Create the ALIAS or ANCHOR token and append it to the queue. */ if (!yaml_parser_scan_anchor(parser, &token, type)) return 0; if (!ENQUEUE(parser, parser->tokens, token)) { yaml_token_delete(&token); return 0; } return 1; } /* * Produce the TAG token. */ static int yaml_parser_fetch_tag(yaml_parser_t *parser) { yaml_token_t token; /* A tag could be a simple key. */ if (!yaml_parser_save_simple_key(parser)) return 0; /* A simple key cannot follow a tag. */ parser->simple_key_allowed = 0; /* Create the TAG token and append it to the queue. */ if (!yaml_parser_scan_tag(parser, &token)) return 0; if (!ENQUEUE(parser, parser->tokens, token)) { yaml_token_delete(&token); return 0; } return 1; } /* * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens. */ static int yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal) { yaml_token_t token; /* Remove any potential simple keys. */ if (!yaml_parser_remove_simple_key(parser)) return 0; /* A simple key may follow a block scalar. */ parser->simple_key_allowed = 1; /* Create the SCALAR token and append it to the queue. */ if (!yaml_parser_scan_block_scalar(parser, &token, literal)) return 0; if (!ENQUEUE(parser, parser->tokens, token)) { yaml_token_delete(&token); return 0; } return 1; } /* * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens. */ static int yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single) { yaml_token_t token; /* A plain scalar could be a simple key. */ if (!yaml_parser_save_simple_key(parser)) return 0; /* A simple key cannot follow a flow scalar. */ parser->simple_key_allowed = 0; /* Create the SCALAR token and append it to the queue. */ if (!yaml_parser_scan_flow_scalar(parser, &token, single)) return 0; if (!ENQUEUE(parser, parser->tokens, token)) { yaml_token_delete(&token); return 0; } return 1; } /* * Produce the SCALAR(...,plain) token. */ static int yaml_parser_fetch_plain_scalar(yaml_parser_t *parser) { yaml_token_t token; /* A plain scalar could be a simple key. */ if (!yaml_parser_save_simple_key(parser)) return 0; /* A simple key cannot follow a flow scalar. */ parser->simple_key_allowed = 0; /* Create the SCALAR token and append it to the queue. */ if (!yaml_parser_scan_plain_scalar(parser, &token)) return 0; if (!ENQUEUE(parser, parser->tokens, token)) { yaml_token_delete(&token); return 0; } return 1; } /* * Eat whitespaces and comments until the next token is found. */ static int yaml_parser_scan_to_next_token(yaml_parser_t *parser) { /* Until the next token is not found. */ while (1) { /* Allow the BOM mark to start a line. */ if (!CACHE(parser, 1)) return 0; if (parser->mark.column == 0 && IS_BOM(parser->buffer)) SKIP(parser); /* * Eat whitespaces. * * Tabs are allowed: * * - in the flow context; * - in the block context, but not at the beginning of the line or * after '-', '?', or ':' (complex value). */ if (!CACHE(parser, 1)) return 0; while (CHECK(parser->buffer,' ') || ((parser->flow_level || !parser->simple_key_allowed) && CHECK(parser->buffer, '\t'))) { SKIP(parser); if (!CACHE(parser, 1)) return 0; } /* Eat a comment until a line break. */ if (CHECK(parser->buffer, '#')) { while (!IS_BREAKZ(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) return 0; } } /* If it is a line break, eat it. */ if (IS_BREAK(parser->buffer)) { if (!CACHE(parser, 2)) return 0; SKIP_LINE(parser); /* In the block context, a new line may start a simple key. */ if (!parser->flow_level) { parser->simple_key_allowed = 1; } } else { /* We have found a token. */ break; } } return 1; } /* * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token. * * Scope: * %YAML 1.1 # a comment \n * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ * %TAG !yaml! tag:yaml.org,2002: \n * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */ int yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token) { yaml_mark_t start_mark, end_mark; yaml_char_t *name = NULL; int major, minor; yaml_char_t *handle = NULL, *prefix = NULL; /* Eat '%'. */ start_mark = parser->mark; SKIP(parser); /* Scan the directive name. */ if (!yaml_parser_scan_directive_name(parser, start_mark, &name)) goto error; /* Is it a YAML directive? */ if (strcmp((char *)name, "YAML") == 0) { /* Scan the VERSION directive value. */ if (!yaml_parser_scan_version_directive_value(parser, start_mark, &major, &minor)) goto error; end_mark = parser->mark; /* Create a VERSION-DIRECTIVE token. */ VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor, start_mark, end_mark); } /* Is it a TAG directive? */ else if (strcmp((char *)name, "TAG") == 0) { /* Scan the TAG directive value. */ if (!yaml_parser_scan_tag_directive_value(parser, start_mark, &handle, &prefix)) goto error; end_mark = parser->mark; /* Create a TAG-DIRECTIVE token. */ TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix, start_mark, end_mark); } /* Unknown directive. */ else { yaml_parser_set_scanner_error(parser, "while scanning a directive", start_mark, "found unknown directive name"); goto error; } /* Eat the rest of the line including any comments. */ if (!CACHE(parser, 1)) goto error; while (IS_BLANK(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) goto error; } if (CHECK(parser->buffer, '#')) { while (!IS_BREAKZ(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) goto error; } } /* Check if we are at the end of the line. */ if (!IS_BREAKZ(parser->buffer)) { yaml_parser_set_scanner_error(parser, "while scanning a directive", start_mark, "did not find expected comment or line break"); goto error; } /* Eat a line break. */ if (IS_BREAK(parser->buffer)) { if (!CACHE(parser, 2)) goto error; SKIP_LINE(parser); } yaml_free(name); return 1; error: yaml_free(prefix); yaml_free(handle); yaml_free(name); return 0; } /* * Scan the directive name. * * Scope: * %YAML 1.1 # a comment \n * ^^^^ * %TAG !yaml! tag:yaml.org,2002: \n * ^^^ */ static int yaml_parser_scan_directive_name(yaml_parser_t *parser, yaml_mark_t start_mark, yaml_char_t **name) { yaml_string_t string = NULL_STRING; if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; /* Consume the directive name. */ if (!CACHE(parser, 1)) goto error; while (IS_ALPHA(parser->buffer)) { if (!READ(parser, string)) goto error; if (!CACHE(parser, 1)) goto error; } /* Check if the name is empty. */ if (string.start == string.pointer) { yaml_parser_set_scanner_error(parser, "while scanning a directive", start_mark, "could not find expected directive name"); goto error; } /* Check for an blank character after the name. */ if (!IS_BLANKZ(parser->buffer)) { yaml_parser_set_scanner_error(parser, "while scanning a directive", start_mark, "found unexpected non-alphabetical character"); goto error; } *name = string.start; return 1; error: STRING_DEL(parser, string); return 0; } /* * Scan the value of VERSION-DIRECTIVE. * * Scope: * %YAML 1.1 # a comment \n * ^^^^^^ */ static int yaml_parser_scan_version_directive_value(yaml_parser_t *parser, yaml_mark_t start_mark, int *major, int *minor) { /* Eat whitespaces. */ if (!CACHE(parser, 1)) return 0; while (IS_BLANK(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) return 0; } /* Consume the major version number. */ if (!yaml_parser_scan_version_directive_number(parser, start_mark, major)) return 0; /* Eat '.'. */ if (!CHECK(parser->buffer, '.')) { return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", start_mark, "did not find expected digit or '.' character"); } SKIP(parser); /* Consume the minor version number. */ if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor)) return 0; return 1; } #define MAX_NUMBER_LENGTH 9 /* * Scan the version number of VERSION-DIRECTIVE. * * Scope: * %YAML 1.1 # a comment \n * ^ * %YAML 1.1 # a comment \n * ^ */ static int yaml_parser_scan_version_directive_number(yaml_parser_t *parser, yaml_mark_t start_mark, int *number) { int value = 0; size_t length = 0; /* Repeat while the next character is digit. */ if (!CACHE(parser, 1)) return 0; while (IS_DIGIT(parser->buffer)) { /* Check if the number is too long. */ if (++length > MAX_NUMBER_LENGTH) { return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", start_mark, "found extremely long version number"); } value = value*10 + AS_DIGIT(parser->buffer); SKIP(parser); if (!CACHE(parser, 1)) return 0; } /* Check if the number was present. */ if (!length) { return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", start_mark, "did not find expected version number"); } *number = value; return 1; } /* * Scan the value of a TAG-DIRECTIVE token. * * Scope: * %TAG !yaml! tag:yaml.org,2002: \n * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */ static int yaml_parser_scan_tag_directive_value(yaml_parser_t *parser, yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix) { yaml_char_t *handle_value = NULL; yaml_char_t *prefix_value = NULL; /* Eat whitespaces. */ if (!CACHE(parser, 1)) goto error; while (IS_BLANK(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) goto error; } /* Scan a handle. */ if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value)) goto error; /* Expect a whitespace. */ if (!CACHE(parser, 1)) goto error; if (!IS_BLANK(parser->buffer)) { yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive", start_mark, "did not find expected whitespace"); goto error; } /* Eat whitespaces. */ while (IS_BLANK(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) goto error; } /* Scan a prefix. */ if (!yaml_parser_scan_tag_uri(parser, 1, 1, NULL, start_mark, &prefix_value)) goto error; /* Expect a whitespace or line break. */ if (!CACHE(parser, 1)) goto error; if (!IS_BLANKZ(parser->buffer)) { yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive", start_mark, "did not find expected whitespace or line break"); goto error; } *handle = handle_value; *prefix = prefix_value; return 1; error: yaml_free(handle_value); yaml_free(prefix_value); return 0; } static int yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token, yaml_token_type_t type) { int length = 0; yaml_mark_t start_mark, end_mark; yaml_string_t string = NULL_STRING; if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; /* Eat the indicator character. */ start_mark = parser->mark; SKIP(parser); /* Consume the value. */ if (!CACHE(parser, 1)) goto error; while (IS_ALPHA(parser->buffer)) { if (!READ(parser, string)) goto error; if (!CACHE(parser, 1)) goto error; length ++; } end_mark = parser->mark; /* * Check if length of the anchor is greater than 0 and it is followed by * a whitespace character or one of the indicators: * * '?', ':', ',', ']', '}', '%', '@', '`'. */ if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',') || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}') || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@') || CHECK(parser->buffer, '`'))) { yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ? "while scanning an anchor" : "while scanning an alias", start_mark, "did not find expected alphabetic or numeric character"); goto error; } /* Create a token. */ if (type == YAML_ANCHOR_TOKEN) { ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark); } else { ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark); } return 1; error: STRING_DEL(parser, string); return 0; } /* * Scan a TAG token. */ static int yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token) { yaml_char_t *handle = NULL; yaml_char_t *suffix = NULL; yaml_mark_t start_mark, end_mark; start_mark = parser->mark; /* Check if the tag is in the canonical form. */ if (!CACHE(parser, 2)) goto error; if (CHECK_AT(parser->buffer, '<', 1)) { /* Set the handle to '' */ handle = YAML_MALLOC(1); if (!handle) goto error; handle[0] = '\0'; /* Eat '!<' */ SKIP(parser); SKIP(parser); /* Consume the tag value. */ if (!yaml_parser_scan_tag_uri(parser, 1, 0, NULL, start_mark, &suffix)) goto error; /* Check for '>' and eat it. */ if (!CHECK(parser->buffer, '>')) { yaml_parser_set_scanner_error(parser, "while scanning a tag", start_mark, "did not find the expected '>'"); goto error; } SKIP(parser); } else { /* The tag has either the '!suffix' or the '!handle!suffix' form. */ /* First, try to scan a handle. */ if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle)) goto error; /* Check if it is, indeed, handle. */ if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!') { /* Scan the suffix now. */ if (!yaml_parser_scan_tag_uri(parser, 0, 0, NULL, start_mark, &suffix)) goto error; } else { /* It wasn't a handle after all. Scan the rest of the tag. */ if (!yaml_parser_scan_tag_uri(parser, 0, 0, handle, start_mark, &suffix)) goto error; /* Set the handle to '!'. */ yaml_free(handle); handle = YAML_MALLOC(2); if (!handle) goto error; handle[0] = '!'; handle[1] = '\0'; /* * A special case: the '!' tag. Set the handle to '' and the * suffix to '!'. */ if (suffix[0] == '\0') { yaml_char_t *tmp = handle; handle = suffix; suffix = tmp; } } } /* Check the character which ends the tag. */ if (!CACHE(parser, 1)) goto error; if (!IS_BLANKZ(parser->buffer)) { if (!parser->flow_level || !CHECK(parser->buffer, ',') ) { yaml_parser_set_scanner_error(parser, "while scanning a tag", start_mark, "did not find expected whitespace or line break"); goto error; } } end_mark = parser->mark; /* Create a token. */ TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark); return 1; error: yaml_free(handle); yaml_free(suffix); return 0; } /* * Scan a tag handle. */ static int yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive, yaml_mark_t start_mark, yaml_char_t **handle) { yaml_string_t string = NULL_STRING; if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; /* Check the initial '!' character. */ if (!CACHE(parser, 1)) goto error; if (!CHECK(parser->buffer, '!')) { yaml_parser_set_scanner_error(parser, directive ? "while scanning a tag directive" : "while scanning a tag", start_mark, "did not find expected '!'"); goto error; } /* Copy the '!' character. */ if (!READ(parser, string)) goto error; /* Copy all subsequent alphabetical and numerical characters. */ if (!CACHE(parser, 1)) goto error; while (IS_ALPHA(parser->buffer)) { if (!READ(parser, string)) goto error; if (!CACHE(parser, 1)) goto error; } /* Check if the trailing character is '!' and copy it. */ if (CHECK(parser->buffer, '!')) { if (!READ(parser, string)) goto error; } else { /* * It's either the '!' tag or not really a tag handle. If it's a %TAG * directive, it's an error. If it's a tag token, it must be a part of * URI. */ if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) { yaml_parser_set_scanner_error(parser, "while parsing a tag directive", start_mark, "did not find expected '!'"); goto error; } } *handle = string.start; return 1; error: STRING_DEL(parser, string); return 0; } /* * Scan a tag. */ static int yaml_parser_scan_tag_uri(yaml_parser_t *parser, int uri_char, int directive, yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri) { size_t length = head ? strlen((char *)head) : 0; yaml_string_t string = NULL_STRING; if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; /* Resize the string to include the head. */ while ((size_t)(string.end - string.start) <= length) { if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) { parser->error = YAML_MEMORY_ERROR; goto error; } } /* * Copy the head if needed. * * Note that we don't copy the leading '!' character. */ if (length > 1) { memcpy(string.start, head+1, length-1); string.pointer += length-1; } /* Scan the tag. */ if (!CACHE(parser, 1)) goto error; /* * The set of characters that may appear in URI is as follows: * * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&', * '=', '+', '$', '.', '!', '~', '*', '\'', '(', ')', '%'. * * If we are inside a verbatim tag <...> (parameter uri_char is true) * then also the following flow indicators are allowed: * ',', '[', ']' */ while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';') || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@') || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=') || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$') || CHECK(parser->buffer, '.') || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~') || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'') || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')') || (uri_char && ( CHECK(parser->buffer, ',') || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']') ) )) { /* Check if it is a URI-escape sequence. */ if (CHECK(parser->buffer, '%')) { if (!STRING_EXTEND(parser, string)) goto error; if (!yaml_parser_scan_uri_escapes(parser, directive, start_mark, &string)) goto error; } else { if (!READ(parser, string)) goto error; } length ++; if (!CACHE(parser, 1)) goto error; } /* Check if the tag is non-empty. */ if (!length) { if (!STRING_EXTEND(parser, string)) goto error; yaml_parser_set_scanner_error(parser, directive ? "while parsing a %TAG directive" : "while parsing a tag", start_mark, "did not find expected tag URI"); goto error; } *uri = string.start; return 1; error: STRING_DEL(parser, string); return 0; } /* * Decode an URI-escape sequence corresponding to a single UTF-8 character. */ static int yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive, yaml_mark_t start_mark, yaml_string_t *string) { int width = 0; /* Decode the required number of characters. */ do { unsigned char octet = 0; /* Check for a URI-escaped octet. */ if (!CACHE(parser, 3)) return 0; if (!(CHECK(parser->buffer, '%') && IS_HEX_AT(parser->buffer, 1) && IS_HEX_AT(parser->buffer, 2))) { return yaml_parser_set_scanner_error(parser, directive ? "while parsing a %TAG directive" : "while parsing a tag", start_mark, "did not find URI escaped octet"); } /* Get the octet. */ octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2); /* If it is the leading octet, determine the length of the UTF-8 sequence. */ if (!width) { width = (octet & 0x80) == 0x00 ? 1 : (octet & 0xE0) == 0xC0 ? 2 : (octet & 0xF0) == 0xE0 ? 3 : (octet & 0xF8) == 0xF0 ? 4 : 0; if (!width) { return yaml_parser_set_scanner_error(parser, directive ? "while parsing a %TAG directive" : "while parsing a tag", start_mark, "found an incorrect leading UTF-8 octet"); } } else { /* Check if the trailing octet is correct. */ if ((octet & 0xC0) != 0x80) { return yaml_parser_set_scanner_error(parser, directive ? "while parsing a %TAG directive" : "while parsing a tag", start_mark, "found an incorrect trailing UTF-8 octet"); } } /* Copy the octet and move the pointers. */ *(string->pointer++) = octet; SKIP(parser); SKIP(parser); SKIP(parser); } while (--width); return 1; } /* * Scan a block scalar. */ static int yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token, int literal) { yaml_mark_t start_mark; yaml_mark_t end_mark; yaml_string_t string = NULL_STRING; yaml_string_t leading_break = NULL_STRING; yaml_string_t trailing_breaks = NULL_STRING; int chomping = 0; int increment = 0; int indent = 0; int leading_blank = 0; int trailing_blank = 0; if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error; if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error; /* Eat the indicator '|' or '>'. */ start_mark = parser->mark; SKIP(parser); /* Scan the additional block scalar indicators. */ if (!CACHE(parser, 1)) goto error; /* Check for a chomping indicator. */ if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) { /* Set the chomping method and eat the indicator. */ chomping = CHECK(parser->buffer, '+') ? +1 : -1; SKIP(parser); /* Check for an indentation indicator. */ if (!CACHE(parser, 1)) goto error; if (IS_DIGIT(parser->buffer)) { /* Check that the indentation is greater than 0. */ if (CHECK(parser->buffer, '0')) { yaml_parser_set_scanner_error(parser, "while scanning a block scalar", start_mark, "found an indentation indicator equal to 0"); goto error; } /* Get the indentation level and eat the indicator. */ increment = AS_DIGIT(parser->buffer); SKIP(parser); } } /* Do the same as above, but in the opposite order. */ else if (IS_DIGIT(parser->buffer)) { if (CHECK(parser->buffer, '0')) { yaml_parser_set_scanner_error(parser, "while scanning a block scalar", start_mark, "found an indentation indicator equal to 0"); goto error; } increment = AS_DIGIT(parser->buffer); SKIP(parser); if (!CACHE(parser, 1)) goto error; if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) { chomping = CHECK(parser->buffer, '+') ? +1 : -1; SKIP(parser); } } /* Eat whitespaces and comments to the end of the line. */ if (!CACHE(parser, 1)) goto error; while (IS_BLANK(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) goto error; } if (CHECK(parser->buffer, '#')) { while (!IS_BREAKZ(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) goto error; } } /* Check if we are at the end of the line. */ if (!IS_BREAKZ(parser->buffer)) { yaml_parser_set_scanner_error(parser, "while scanning a block scalar", start_mark, "did not find expected comment or line break"); goto error; } /* Eat a line break. */ if (IS_BREAK(parser->buffer)) { if (!CACHE(parser, 2)) goto error; SKIP_LINE(parser); } end_mark = parser->mark; /* Set the indentation level if it was specified. */ if (increment) { indent = parser->indent >= 0 ? parser->indent+increment : increment; } /* Scan the leading line breaks and determine the indentation level if needed. */ if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks, start_mark, &end_mark)) goto error; /* Scan the block scalar content. */ if (!CACHE(parser, 1)) goto error; while ((int)parser->mark.column == indent && !(IS_Z(parser->buffer))) { /* * We are at the beginning of a non-empty line. */ /* Is it a trailing whitespace? */ trailing_blank = IS_BLANK(parser->buffer); /* Check if we need to fold the leading line break. */ if (!literal && (*leading_break.start == '\n') && !leading_blank && !trailing_blank) { /* Do we need to join the lines by space? */ if (*trailing_breaks.start == '\0') { if (!STRING_EXTEND(parser, string)) goto error; *(string.pointer ++) = ' '; } CLEAR(parser, leading_break); } else { if (!JOIN(parser, string, leading_break)) goto error; CLEAR(parser, leading_break); } /* Append the remaining line breaks. */ if (!JOIN(parser, string, trailing_breaks)) goto error; CLEAR(parser, trailing_breaks); /* Is it a leading whitespace? */ leading_blank = IS_BLANK(parser->buffer); /* Consume the current line. */ while (!IS_BREAKZ(parser->buffer)) { if (!READ(parser, string)) goto error; if (!CACHE(parser, 1)) goto error; } /* Consume the line break. */ if (!CACHE(parser, 2)) goto error; if (!READ_LINE(parser, leading_break)) goto error; /* Eat the following indentation spaces and line breaks. */ if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks, start_mark, &end_mark)) goto error; } /* Chomp the tail. */ if (chomping != -1) { if (!JOIN(parser, string, leading_break)) goto error; } if (chomping == 1) { if (!JOIN(parser, string, trailing_breaks)) goto error; } /* Create a token. */ SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start, literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE, start_mark, end_mark); STRING_DEL(parser, leading_break); STRING_DEL(parser, trailing_breaks); return 1; error: STRING_DEL(parser, string); STRING_DEL(parser, leading_break); STRING_DEL(parser, trailing_breaks); return 0; } /* * Scan indentation spaces and line breaks for a block scalar. Determine the * indentation level if needed. */ static int yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser, int *indent, yaml_string_t *breaks, yaml_mark_t start_mark, yaml_mark_t *end_mark) { int max_indent = 0; *end_mark = parser->mark; /* Eat the indentation spaces and line breaks. */ while (1) { /* Eat the indentation spaces. */ if (!CACHE(parser, 1)) return 0; while ((!*indent || (int)parser->mark.column < *indent) && IS_SPACE(parser->buffer)) { SKIP(parser); if (!CACHE(parser, 1)) return 0; } if ((int)parser->mark.column > max_indent) max_indent = (int)parser->mark.column; /* Check for a tab character messing the indentation. */ if ((!*indent || (int)parser->mark.column < *indent) && IS_TAB(parser->buffer)) { return yaml_parser_set_scanner_error(parser, "while scanning a block scalar", start_mark, "found a tab character where an indentation space is expected"); } /* Have we found a non-empty line? */ if (!IS_BREAK(parser->buffer)) break; /* Consume the line break. */ if (!CACHE(parser, 2)) return 0; if (!READ_LINE(parser, *breaks)) return 0; *end_mark = parser->mark; } /* Determine the indentation level if needed. */ if (!*indent) { *indent = max_indent; if (*indent < parser->indent + 1) *indent = parser->indent + 1; if (*indent < 1) *indent = 1; } return 1; } /* * Scan a quoted scalar. */ static int yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token, int single) { yaml_mark_t start_mark; yaml_mark_t end_mark; yaml_string_t string = NULL_STRING; yaml_string_t leading_break = NULL_STRING; yaml_string_t trailing_breaks = NULL_STRING; yaml_string_t whitespaces = NULL_STRING; int leading_blanks; if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error; if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error; if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error; /* Eat the left quote. */ start_mark = parser->mark; SKIP(parser); /* Consume the content of the quoted scalar. */ while (1) { /* Check that there are no document indicators at the beginning of the line. */ if (!CACHE(parser, 4)) goto error; if (parser->mark.column == 0 && ((CHECK_AT(parser->buffer, '-', 0) && CHECK_AT(parser->buffer, '-', 1) && CHECK_AT(parser->buffer, '-', 2)) || (CHECK_AT(parser->buffer, '.', 0) && CHECK_AT(parser->buffer, '.', 1) && CHECK_AT(parser->buffer, '.', 2))) && IS_BLANKZ_AT(parser->buffer, 3)) { yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar", start_mark, "found unexpected document indicator"); goto error; } /* Check for EOF. */ if (IS_Z(parser->buffer)) { yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar", start_mark, "found unexpected end of stream"); goto error; } /* Consume non-blank characters. */ if (!CACHE(parser, 2)) goto error; leading_blanks = 0; while (!IS_BLANKZ(parser->buffer)) { /* Check for an escaped single quote. */ if (single && CHECK_AT(parser->buffer, '\'', 0) && CHECK_AT(parser->buffer, '\'', 1)) { if (!STRING_EXTEND(parser, string)) goto error; *(string.pointer++) = '\''; SKIP(parser); SKIP(parser); } /* Check for the right quote. */ else if (CHECK(parser->buffer, single ? '\'' : '"')) { break; } /* Check for an escaped line break. */ else if (!single && CHECK(parser->buffer, '\\') && IS_BREAK_AT(parser->buffer, 1)) { if (!CACHE(parser, 3)) goto error; SKIP(parser); SKIP_LINE(parser); leading_blanks = 1; break; } /* Check for an escape sequence. */ else if (!single && CHECK(parser->buffer, '\\')) { size_t code_length = 0; if (!STRING_EXTEND(parser, string)) goto error; /* Check the escape character. */ switch (parser->buffer.pointer[1]) { case '0': *(string.pointer++) = '\0'; break; case 'a': *(string.pointer++) = '\x07'; break; case 'b': *(string.pointer++) = '\x08'; break; case 't': case '\t': *(string.pointer++) = '\x09'; break; case 'n': *(string.pointer++) = '\x0A'; break; case 'v': *(string.pointer++) = '\x0B'; break; case 'f': *(string.pointer++) = '\x0C'; break; case 'r': *(string.pointer++) = '\x0D'; break; case 'e': *(string.pointer++) = '\x1B'; break; case ' ': *(string.pointer++) = '\x20'; break; case '"': *(string.pointer++) = '"'; break; case '/': *(string.pointer++) = '/'; break; case '\\': *(string.pointer++) = '\\'; break; case 'N': /* NEL (#x85) */ *(string.pointer++) = '\xC2'; *(string.pointer++) = '\x85'; break; case '_': /* #xA0 */ *(string.pointer++) = '\xC2'; *(string.pointer++) = '\xA0'; break; case 'L': /* LS (#x2028) */ *(string.pointer++) = '\xE2'; *(string.pointer++) = '\x80'; *(string.pointer++) = '\xA8'; break; case 'P': /* PS (#x2029) */ *(string.pointer++) = '\xE2'; *(string.pointer++) = '\x80'; *(string.pointer++) = '\xA9'; break; case 'x': code_length = 2; break; case 'u': code_length = 4; break; case 'U': code_length = 8; break; default: yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", start_mark, "found unknown escape character"); goto error; } SKIP(parser); SKIP(parser); /* Consume an arbitrary escape code. */ if (code_length) { unsigned int value = 0; size_t k; /* Scan the character value. */ if (!CACHE(parser, code_length)) goto error; for (k = 0; k < code_length; k ++) { if (!IS_HEX_AT(parser->buffer, k)) { yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", start_mark, "did not find expected hexdecimal number"); goto error; } value = (value << 4) + AS_HEX_AT(parser->buffer, k); } /* Check the value and write the character. */ if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) { yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", start_mark, "found invalid Unicode character escape code"); goto error; } if (value <= 0x7F) { *(string.pointer++) = value; } else if (value <= 0x7FF) { *(string.pointer++) = 0xC0 + (value >> 6); *(string.pointer++) = 0x80 + (value & 0x3F); } else if (value <= 0xFFFF) { *(string.pointer++) = 0xE0 + (value >> 12); *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F); *(string.pointer++) = 0x80 + (value & 0x3F); } else { *(string.pointer++) = 0xF0 + (value >> 18); *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F); *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F); *(string.pointer++) = 0x80 + (value & 0x3F); } /* Advance the pointer. */ for (k = 0; k < code_length; k ++) { SKIP(parser); } } } else { /* It is a non-escaped non-blank character. */ if (!READ(parser, string)) goto error; } if (!CACHE(parser, 2)) goto error; } /* Check if we are at the end of the scalar. */ /* Fix for crash unitialized value crash * Credit for the bug and input is to OSS Fuzz * Credit for the fix to Alex Gaynor */ if (!CACHE(parser, 1)) goto error; if (CHECK(parser->buffer, single ? '\'' : '"')) break; /* Consume blank characters. */ if (!CACHE(parser, 1)) goto error; while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)) { if (IS_BLANK(parser->buffer)) { /* Consume a space or a tab character. */ if (!leading_blanks) { if (!READ(parser, whitespaces)) goto error; } else { SKIP(parser); } } else { if (!CACHE(parser, 2)) goto error; /* Check if it is a first line break. */ if (!leading_blanks) { CLEAR(parser, whitespaces); if (!READ_LINE(parser, leading_break)) goto error; leading_blanks = 1; } else { if (!READ_LINE(parser, trailing_breaks)) goto error; } } if (!CACHE(parser, 1)) goto error; } /* Join the whitespaces or fold line breaks. */ if (leading_blanks) { /* Do we need to fold line breaks? */ if (leading_break.start[0] == '\n') { if (trailing_breaks.start[0] == '\0') { if (!STRING_EXTEND(parser, string)) goto error; *(string.pointer++) = ' '; } else { if (!JOIN(parser, string, trailing_breaks)) goto error; CLEAR(parser, trailing_breaks); } CLEAR(parser, leading_break); } else { if (!JOIN(parser, string, leading_break)) goto error; if (!JOIN(parser, string, trailing_breaks)) goto error; CLEAR(parser, leading_break); CLEAR(parser, trailing_breaks); } } else { if (!JOIN(parser, string, whitespaces)) goto error; CLEAR(parser, whitespaces); } } /* Eat the right quote. */ SKIP(parser); end_mark = parser->mark; /* Create a token. */ SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start, single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE, start_mark, end_mark); STRING_DEL(parser, leading_break); STRING_DEL(parser, trailing_breaks); STRING_DEL(parser, whitespaces); return 1; error: STRING_DEL(parser, string); STRING_DEL(parser, leading_break); STRING_DEL(parser, trailing_breaks); STRING_DEL(parser, whitespaces); return 0; } /* * Scan a plain scalar. */ static int yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token) { yaml_mark_t start_mark; yaml_mark_t end_mark; yaml_string_t string = NULL_STRING; yaml_string_t leading_break = NULL_STRING; yaml_string_t trailing_breaks = NULL_STRING; yaml_string_t whitespaces = NULL_STRING; int leading_blanks = 0; int indent = parser->indent+1; if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error; if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error; if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error; start_mark = end_mark = parser->mark; /* Consume the content of the plain scalar. */ while (1) { /* Check for a document indicator. */ if (!CACHE(parser, 4)) goto error; if (parser->mark.column == 0 && ((CHECK_AT(parser->buffer, '-', 0) && CHECK_AT(parser->buffer, '-', 1) && CHECK_AT(parser->buffer, '-', 2)) || (CHECK_AT(parser->buffer, '.', 0) && CHECK_AT(parser->buffer, '.', 1) && CHECK_AT(parser->buffer, '.', 2))) && IS_BLANKZ_AT(parser->buffer, 3)) break; /* Check for a comment. */ if (CHECK(parser->buffer, '#')) break; /* Consume non-blank characters. */ while (!IS_BLANKZ(parser->buffer)) { /* Check for "x:" + one of ',?[]{}' in the flow context. TODO: Fix the test "spec-08-13". * This is not completely according to the spec * See http://yaml.org/spec/1.1/#id907281 9.1.3. Plain */ if (parser->flow_level && CHECK(parser->buffer, ':') && ( CHECK_AT(parser->buffer, ',', 1) || CHECK_AT(parser->buffer, '?', 1) || CHECK_AT(parser->buffer, '[', 1) || CHECK_AT(parser->buffer, ']', 1) || CHECK_AT(parser->buffer, '{', 1) || CHECK_AT(parser->buffer, '}', 1) ) ) { yaml_parser_set_scanner_error(parser, "while scanning a plain scalar", start_mark, "found unexpected ':'"); goto error; } /* Check for indicators that may end a plain scalar. */ if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1)) || (parser->flow_level && (CHECK(parser->buffer, ',') || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{') || CHECK(parser->buffer, '}')))) break; /* Check if we need to join whitespaces and breaks. */ if (leading_blanks || whitespaces.start != whitespaces.pointer) { if (leading_blanks) { /* Do we need to fold line breaks? */ if (leading_break.start[0] == '\n') { if (trailing_breaks.start[0] == '\0') { if (!STRING_EXTEND(parser, string)) goto error; *(string.pointer++) = ' '; } else { if (!JOIN(parser, string, trailing_breaks)) goto error; CLEAR(parser, trailing_breaks); } CLEAR(parser, leading_break); } else { if (!JOIN(parser, string, leading_break)) goto error; if (!JOIN(parser, string, trailing_breaks)) goto error; CLEAR(parser, leading_break); CLEAR(parser, trailing_breaks); } leading_blanks = 0; } else { if (!JOIN(parser, string, whitespaces)) goto error; CLEAR(parser, whitespaces); } } /* Copy the character. */ if (!READ(parser, string)) goto error; end_mark = parser->mark; if (!CACHE(parser, 2)) goto error; } /* Is it the end? */ if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))) break; /* Consume blank characters. */ if (!CACHE(parser, 1)) goto error; while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)) { if (IS_BLANK(parser->buffer)) { /* Check for tab characters that abuse indentation. */ if (leading_blanks && (int)parser->mark.column < indent && IS_TAB(parser->buffer)) { yaml_parser_set_scanner_error(parser, "while scanning a plain scalar", start_mark, "found a tab character that violates indentation"); goto error; } /* Consume a space or a tab character. */ if (!leading_blanks) { if (!READ(parser, whitespaces)) goto error; } else { SKIP(parser); } } else { if (!CACHE(parser, 2)) goto error; /* Check if it is a first line break. */ if (!leading_blanks) { CLEAR(parser, whitespaces); if (!READ_LINE(parser, leading_break)) goto error; leading_blanks = 1; } else { if (!READ_LINE(parser, trailing_breaks)) goto error; } } if (!CACHE(parser, 1)) goto error; } /* Check indentation level. */ if (!parser->flow_level && (int)parser->mark.column < indent) break; } /* Create a token. */ SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start, YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark); /* Note that we change the 'simple_key_allowed' flag. */ if (leading_blanks) { parser->simple_key_allowed = 1; } STRING_DEL(parser, leading_break); STRING_DEL(parser, trailing_breaks); STRING_DEL(parser, whitespaces); return 1; error: STRING_DEL(parser, string); STRING_DEL(parser, leading_break); STRING_DEL(parser, trailing_breaks); STRING_DEL(parser, whitespaces); return 0; } /* * Declarations. */ static int yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem); YAML_DECLARE(int) yaml_emitter_flush(yaml_emitter_t *emitter); /* * Set the writer error and return 0. */ static int yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem) { emitter->error = YAML_WRITER_ERROR; emitter->problem = problem; return 0; } /* * Flush the output buffer. */ YAML_DECLARE(int) yaml_emitter_flush(yaml_emitter_t *emitter) { int low, high; assert(emitter); /* Non-NULL emitter object is expected. */ assert(emitter->write_handler); /* Write handler must be set. */ assert(emitter->encoding); /* Output encoding must be set. */ emitter->buffer.last = emitter->buffer.pointer; emitter->buffer.pointer = emitter->buffer.start; /* Check if the buffer is empty. */ if (emitter->buffer.start == emitter->buffer.last) { return 1; } /* If the output encoding is UTF-8, we don't need to recode the buffer. */ if (emitter->encoding == YAML_UTF8_ENCODING) { if (emitter->write_handler(emitter->write_handler_data, emitter->buffer.start, emitter->buffer.last - emitter->buffer.start)) { emitter->buffer.last = emitter->buffer.start; emitter->buffer.pointer = emitter->buffer.start; return 1; } else { return yaml_emitter_set_writer_error(emitter, "write error"); } } /* Recode the buffer into the raw buffer. */ low = (emitter->encoding == YAML_UTF16LE_ENCODING ? 0 : 1); high = (emitter->encoding == YAML_UTF16LE_ENCODING ? 1 : 0); while (emitter->buffer.pointer != emitter->buffer.last) { unsigned char octet; unsigned int width; unsigned int value; size_t k; /* * See the "reader.c" code for more details on UTF-8 encoding. Note * that we assume that the buffer contains a valid UTF-8 sequence. */ /* Read the next UTF-8 character. */ octet = emitter->buffer.pointer[0]; width = (octet & 0x80) == 0x00 ? 1 : (octet & 0xE0) == 0xC0 ? 2 : (octet & 0xF0) == 0xE0 ? 3 : (octet & 0xF8) == 0xF0 ? 4 : 0; value = (octet & 0x80) == 0x00 ? octet & 0x7F : (octet & 0xE0) == 0xC0 ? octet & 0x1F : (octet & 0xF0) == 0xE0 ? octet & 0x0F : (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; for (k = 1; k < width; k ++) { octet = emitter->buffer.pointer[k]; value = (value << 6) + (octet & 0x3F); } emitter->buffer.pointer += width; /* Write the character. */ if (value < 0x10000) { emitter->raw_buffer.last[high] = value >> 8; emitter->raw_buffer.last[low] = value & 0xFF; emitter->raw_buffer.last += 2; } else { /* Write the character using a surrogate pair (check "reader.c"). */ value -= 0x10000; emitter->raw_buffer.last[high] = 0xD8 + (value >> 18); emitter->raw_buffer.last[low] = (value >> 10) & 0xFF; emitter->raw_buffer.last[high+2] = 0xDC + ((value >> 8) & 0xFF); emitter->raw_buffer.last[low+2] = value & 0xFF; emitter->raw_buffer.last += 4; } } /* Write the raw buffer. */ if (emitter->write_handler(emitter->write_handler_data, emitter->raw_buffer.start, emitter->raw_buffer.last - emitter->raw_buffer.start)) { emitter->buffer.last = emitter->buffer.start; emitter->buffer.pointer = emitter->buffer.start; emitter->raw_buffer.last = emitter->raw_buffer.start; emitter->raw_buffer.pointer = emitter->raw_buffer.start; return 1; } else { return yaml_emitter_set_writer_error(emitter, "write error"); } }