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Tools.py

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#!/usr/bin/env python
#
# File for general helper functions
#
# Created by: dandwyer@caltech.edu 2009/07/21

def realpath( pathname ):
    '''Return the absolute path with environment variables and
    symbolic links expanded.'''
    from os import path
    return path.normpath( path.realpath( path.expandvars(pathname) ) )

def mapify(string):
    '''Parse string, return dictionary.  The string can be either in
    the form of a Python dictionary, in which case it is simply
    eval'ed or it can be of the simpler form of key/value pairs
    separated by a colon (":") and with pairs separated with spaces.
    This simpler form assumes all keys and values are themselves to be
    interpreted as strings unless they begin with an "[" in which case
    they will be eval'ed.'''
    if "{" in string and "}" in string: 
        return eval(string)

    ret = {}
    kvs = string.split()
    for kv in kvs:
        k,v = kv.split(":")
        if v[0] == '[': 
            v = eval(v)         # turn into list object
        ret[k] = v
        continue
    return ret

def unitify(string, default_unit=None):
    '''Evaluate the given string in a context with units defined.  If
    default_unit is given it will be implicitly multiplied 
    
    Examples:

    1 == unitify("1")
    1.1 == unitify("1.1")
    1000000000.0 == unitify("second")
    1000000000.0 == unitify("1*second")
    1000000000.0 == unitify("1","second")
    1000000000.0 == unitify("1",units.second)

    '''

    import GaudiKernel.SystemOfUnits as units

    try:                        # check if it is a pure number
        num = eval(string,{},{})
    except NameError:           # must not be
        return eval(string,units.__dict__)
    if default_unit:
        return eval ("%s*%s"%(num,default_unit),units.__dict__)
    return num


    

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