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"""SCons.Scanner.C
This module implements the depenency scanner for C/C++ code.
"""
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import SCons.Scanner
import re
import os.path
angle_re = re.compile('^[ \t]*#[ \t]*include[ \t]+<([\\w./\\\\]+)>', re.M)
quote_re = re.compile('^[ \t]*#[ \t]*include[ \t]+"([\\w./\\\\]+)"', re.M)
def CScan():
"Return a Scanner instance for scanning C/C++ source files"
return SCons.Scanner.Scanner(scan)
def find_files(filenames, paths):
"""
find_files([str], [str]) -> [str]
filenames - a list of filenames to find
paths - a list of paths to search in
returns - the fullnames of the files
Only the first fullname found is returned for each filename, and any
file that aren't found are ignored.
"""
fullnames = []
for filename in filenames:
for path in paths:
fullname = os.path.join(path, filename)
if os.path.exists(fullname):
fullnames.append(fullname)
break
return fullnames
def scan(filename, env):
"""
scan(str, Environment) -> [str]
the C/C++ dependency scanner function
This function is intentionally simple. There are two rules it
follows:
1) #include <foo.h> - search for foo.h in CPPPATH followed by the
directory 'filename' is in
2) #include \"foo.h\" - search for foo.h in the directory 'filename' is
in followed by CPPPATH
These rules approximate the behaviour of most C/C++ compilers.
This scanner also ignores #ifdef and other preprocessor conditionals, so
it may find more depencies than there really are, but it never misses
dependencies.
"""
if hasattr(env, "CPPPATH"):
paths = env.CPPPATH
else:
paths = []
file = open(filename)
contents = file.read()
file.close()
angle_includes = angle_re.findall(contents)
quote_includes = quote_re.findall(contents)
source_dir = os.path.dirname(filename)
deps = (find_files(angle_includes, paths + [source_dir])
+ find_files(quote_includes, [source_dir] + paths))
return deps
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