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# $Id$
import re
def filterLines(lines, regex):
'''Filters each line of the given line iterator using the given regular
expression string. For each match, a tuple containing the text matching
each capture group from the regular expression is yielded.
'''
matcher = re.compile(regex)
for line in lines:
if line.endswith('\n'):
line = line[ : -1]
match = matcher.match(line)
if match:
yield match.groups()
def filterFile(filePath, regex):
'''Filters each line of the given text file using the given regular
expression string. For each match, a tuple containing the text matching
each capture group from the regular expression is yielded.
'''
inp = open(filePath, 'r')
try:
for groups in filterLines(inp, regex):
yield groups
finally:
inp.close()
def joinContinuedLines(lines):
'''Iterates through the given lines, replacing lines that are continued
using a trailing backslash with a single line.
'''
buf = ''
for line in lines:
if line.endswith('\\\n'):
buf += line[ : -2]
elif line.endswith('\\'):
buf += line[ : -1]
else:
yield buf + line
buf = ''
if buf:
raise ValueError('Continuation on last line')
def extractMakeVariables(filePath):
'''Extract all variable definitions from the given Makefile.
Returns a dictionary that maps each variable name to its value.
'''
makeVars = {}
inp = open(filePath, 'r')
try:
for name, value in filterLines(
joinContinuedLines(inp),
r'[ ]*([A-Za-z0-9_]+)[ ]*:=(.*)'
):
makeVars[name] = value.strip()
finally:
inp.close()
return makeVars
def parseBool(valueStr):
'''Parses a string containing a boolean value.
Accepted values are "true" and "false"; anything else raises ValueError.
'''
if valueStr == 'true':
return True
elif valueStr == 'false':
return False
else:
raise ValueError('Invalid boolean "%s"' % valueStr)
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