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from os.path import isdir
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')
_reEval = re.compile('(\$\(|\))')
def evalMakeExpr(expr, makeVars):
'''Evaluates variable references in an expression.
Raises ValueError if there is a syntax error in the expression.
Raises KeyError if the expression references a non-existing variable.
'''
stack = [ [] ]
for part in _reEval.split(expr):
if part == '$(':
stack.append([])
elif part == ')' and len(stack) != 1:
name = ''.join(stack.pop())
if name.startswith('addprefix '):
prefix, args = name[len('addprefix') : ].split(',')
prefix = prefix.strip()
value = ' '.join(prefix + arg for arg in args.split())
elif name.startswith('addsuffix '):
suffix, args = name[len('addsuffix') : ].split(',')
suffix = suffix.strip()
value = ' '.join(arg + suffix for arg in args.split())
elif name.startswith('shell '):
# Unsupported; assume result is never used.
value = '?'
elif name.startswith('call DIR_IF_EXISTS,'):
# This is our function, not a Make function, but the goal is
# not to emulate Make, so we emulate our function instead.
path = name[len('call DIR_IF_EXISTS,'): ]
value = path if isdir(path) else ''
elif name.isdigit():
# This is a function argument; assume the evaluated result is
# never used.
value = '?'
else:
value = makeVars[name]
stack[-1].append(value)
else:
stack[-1].append(part)
if len(stack) != 1:
raise ValueError('Open without close in "%s"' % expr)
return ''.join(stack.pop())
def extractMakeVariables(filePath, makeVars = None):
'''Extract all variable definitions from the given Makefile.
The optional makeVars argument is a dictionary containing the already
defined variables. These variables will be included in the output; the
given dictionary is not modified.
Returns a dictionary that maps each variable name to its value.
'''
makeVars = {} if makeVars is None else dict(makeVars)
inp = open(filePath, 'r')
try:
for name, assign, value in filterLines(
joinContinuedLines(inp),
r'[ ]*([A-Za-z0-9_]+)[ ]*([+:]?=)(.*)'
):
if assign == '=':
makeVars[name] = value.strip()
elif assign == ':=':
makeVars[name] = evalMakeExpr(value, makeVars).strip()
elif assign == '+=':
# Note: Make will or will not evaluate the added expression
# depending on how the variable was originally defined,
# but we don't store that information.
makeVars[name] = makeVars[name] + ' ' + value.strip()
else:
assert False, assign
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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