98 lines
2.8 KiB
Python
98 lines
2.8 KiB
Python
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import re
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_is_valid_var = re.compile(r'[_a-zA-Z]\w*$')
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_rm = re.compile(r'\$[()]')
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_remove = re.compile(r'\$\([^$]*(\$[^)][^$]*)*\$\)')
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# Regular expressions for splitting strings and handling substitutions,
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# for use by the scons_subst() and scons_subst_list() functions:
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#
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# The first expression compiled matches all of the $-introduced tokens
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# that we need to process in some way, and is used for substitutions.
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# The expressions it matches are:
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#
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# "$$"
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# "$("
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# "$)"
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# "$variable" [must begin with alphabetic or underscore]
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# "${any stuff}"
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#
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# The second expression compiled is used for splitting strings into tokens
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# to be processed, and it matches all of the tokens listed above, plus
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# the following that affect how arguments do or don't get joined together:
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#
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# " " [white space]
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# "non-white-space" [without any dollar signs]
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# "$" [single dollar sign]
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#
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_dollar_exps_str = r'\$[\$\(\)]|\$[_a-zA-Z][\.\w]*|\${[^}]*}'
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_dollar_exps = re.compile(r'(%s)' % _dollar_exps_str)
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_separate_args = re.compile(r'(%s|\s+|[^\s$]+|\$)' % _dollar_exps_str)
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# This regular expression is used to replace strings of multiple white
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# space characters in the string result from the scons_subst() function.
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_space_sep = re.compile(r'[\t ]+(?![^{]*})')
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class ValueTypes:
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"""
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Enum to store what type of value the variable holds.
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"""
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UNKNOWN = 0
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STRING = 1
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CALLABLE = 2
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VARIABLE = 3
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class EnvironmentValue:
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"""
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Hold a single value. We're going to cache parsed version of the file
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We're going to keep track of variables which feed into this values evaluation
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"""
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def __init__(self, value):
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self.value = value
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self.var_type = ValueTypes.UNKNOWN
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if callable(self.value):
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self.var_type = ValueTypes.CALLABLE
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else:
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self.parse_value()
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def parse_value(self):
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"""
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Scan the string and break into component values
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"""
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try:
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if '$' not in self.value:
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self._parsed = self.value
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self.var_type = ValueTypes.STRING
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else:
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# Now we need to parse the specified string
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result = _dollar_exps.sub(sub_match, args)
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print(result)
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pass
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except TypeError:
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# likely callable? either way we don't parse
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self._parsed = self.value
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def parse_trial(self):
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"""
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Try alternate parsing methods.
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:return:
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"""
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parts = []
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for c in self.value:
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pass
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class EnvironmentValues:
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"""
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A class to hold all the environment variables
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"""
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def __init__(self, **kw):
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self._dict = {}
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for k in kw:
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self._dict[k] = EnvironmentValue(kw[k])
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