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+"""SCons.Scanner.C
+
+This module implements the depenency scanner for C/C++ code.
+
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
+#
+# 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__ = "src/engine/SCons/Scanner/C.py 5134 2010/08/16 23:02:40 bdeegan"
+
+import SCons.Node.FS
+import SCons.Scanner
+import SCons.Util
+
+import SCons.cpp
+
+class SConsCPPScanner(SCons.cpp.PreProcessor):
+ """
+ SCons-specific subclass of the cpp.py module's processing.
+
+ We subclass this so that: 1) we can deal with files represented
+ by Nodes, not strings; 2) we can keep track of the files that are
+ missing.
+ """
+ def __init__(self, *args, **kw):
+ SCons.cpp.PreProcessor.__init__(self, *args, **kw)
+ self.missing = []
+ def initialize_result(self, fname):
+ self.result = SCons.Util.UniqueList([fname])
+ def finalize_result(self, fname):
+ return self.result[1:]
+ def find_include_file(self, t):
+ keyword, quote, fname = t
+ result = SCons.Node.FS.find_file(fname, self.searchpath[quote])
+ if not result:
+ self.missing.append((fname, self.current_file))
+ return result
+ def read_file(self, file):
+ try:
+ fp = open(str(file.rfile()))
+ except EnvironmentError, e:
+ self.missing.append((file, self.current_file))
+ return ''
+ else:
+ return fp.read()
+
+def dictify_CPPDEFINES(env):
+ cppdefines = env.get('CPPDEFINES', {})
+ if cppdefines is None:
+ return {}
+ if SCons.Util.is_Sequence(cppdefines):
+ result = {}
+ for c in cppdefines:
+ if SCons.Util.is_Sequence(c):
+ result[c[0]] = c[1]
+ else:
+ result[c] = None
+ return result
+ if not SCons.Util.is_Dict(cppdefines):
+ return {cppdefines : None}
+ return cppdefines
+
+class SConsCPPScannerWrapper(object):
+ """
+ The SCons wrapper around a cpp.py scanner.
+
+ This is the actual glue between the calling conventions of generic
+ SCons scanners, and the (subclass of) cpp.py class that knows how
+ to look for #include lines with reasonably real C-preprocessor-like
+ evaluation of #if/#ifdef/#else/#elif lines.
+ """
+ def __init__(self, name, variable):
+ self.name = name
+ self.path = SCons.Scanner.FindPathDirs(variable)
+ def __call__(self, node, env, path = ()):
+ cpp = SConsCPPScanner(current = node.get_dir(),
+ cpppath = path,
+ dict = dictify_CPPDEFINES(env))
+ result = cpp(node)
+ for included, includer in cpp.missing:
+ fmt = "No dependency generated for file: %s (included from: %s) -- file not found"
+ SCons.Warnings.warn(SCons.Warnings.DependencyWarning,
+ fmt % (included, includer))
+ return result
+
+ def recurse_nodes(self, nodes):
+ return nodes
+ def select(self, node):
+ return self
+
+def CScanner():
+ """Return a prototype Scanner instance for scanning source files
+ that use the C pre-processor"""
+
+ # Here's how we would (or might) use the CPP scanner code above that
+ # knows how to evaluate #if/#ifdef/#else/#elif lines when searching
+ # for #includes. This is commented out for now until we add the
+ # right configurability to let users pick between the scanners.
+ #return SConsCPPScannerWrapper("CScanner", "CPPPATH")
+
+ cs = SCons.Scanner.ClassicCPP("CScanner",
+ "$CPPSUFFIXES",
+ "CPPPATH",
+ '^[ \t]*#[ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")')
+ return cs
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: