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"""SCons.Scanner.C
This module implements the depenency scanner for C/C++ code.
"""
#
# Copyright (c) 2001 Steven Knight
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import copy
import os.path
import re
import SCons.Scanner
import SCons.Util
angle_re = re.compile('^[ \t]*#[ \t]*include[ \t]+<([\\w./\\\\]+)>', re.M)
quote_re = re.compile('^[ \t]*#[ \t]*include[ \t]+"([\\w./\\\\]+)"', re.M)
def CScan(fs = SCons.Node.FS.default_fs):
"Return a prototype Scanner instance for scanning C/C++ source files"
cs = CScanner(scan, "CScan", [fs, ()],
[".c", ".C", ".cxx", ".cpp", ".c++",
".h", ".H", ".hxx", ".hpp"])
cs.fs = fs
return cs
class CScanner(SCons.Scanner.Recursive):
def __init__(self, *args, **kw):
apply(SCons.Scanner.Recursive.__init__, (self,) + args, kw)
self.hash = None
self.pathscanners = {}
def instance(self, env):
"""
Return a unique instance of a C scanner object for a
given environment.
"""
try:
dirs = tuple(SCons.Util.scons_str2nodes(env.Dictionary('CPPPATH'),
self.fs.Dir))
except:
dirs = ()
if not self.pathscanners.has_key(dirs):
clone = copy.copy(self)
clone.hash = dirs
clone.argument = [self.fs, dirs] # XXX reaching into object
self.pathscanners[dirs] = clone
return self.pathscanners[dirs]
def __hash__(self):
return hash(self.hash)
def scan(filename, env, args = [SCons.Node.FS.default_fs, ()]):
"""
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.
"""
fs, cpppath = args
if fs.File(filename, fs.Top).exists():
file = open(filename)
contents = file.read()
file.close()
angle_includes = angle_re.findall(contents)
quote_includes = quote_re.findall(contents)
dir = os.path.dirname(filename)
if dir:
source_dir = (fs.Dir(dir, fs.Top),)
else:
source_dir = ( fs.Top, )
return (SCons.Util.find_files(angle_includes, cpppath + source_dir,
fs.File)
+ SCons.Util.find_files(quote_includes, source_dir + cpppath,
fs.File))
return []
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