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126 lines
4.6 KiB
126 lines
4.6 KiB
"""SCons.Scanner.C
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This module implements the depenency scanner for C/C++ code.
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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__revision__ = "src/engine/SCons/Scanner/C.py 3842 2008/12/20 22:59:52 scons"
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import SCons.Node.FS
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import SCons.Scanner
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import SCons.Util
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import SCons.cpp
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class SConsCPPScanner(SCons.cpp.PreProcessor):
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"""
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SCons-specific subclass of the cpp.py module's processing.
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We subclass this so that: 1) we can deal with files represented
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by Nodes, not strings; 2) we can keep track of the files that are
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missing.
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"""
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def __init__(self, *args, **kw):
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apply(SCons.cpp.PreProcessor.__init__, (self,)+args, kw)
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self.missing = []
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def initialize_result(self, fname):
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self.result = SCons.Util.UniqueList([fname])
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def finalize_result(self, fname):
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return self.result[1:]
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def find_include_file(self, t):
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keyword, quote, fname = t
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result = SCons.Node.FS.find_file(fname, self.searchpath[quote])
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if not result:
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self.missing.append((fname, self.current_file))
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return result
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def read_file(self, file):
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try:
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fp = open(str(file.rfile()))
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except EnvironmentError, e:
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self.missing.append((file, self.current_file))
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return ''
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else:
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return fp.read()
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def dictify_CPPDEFINES(env):
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cppdefines = env.get('CPPDEFINES', {})
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if cppdefines is None:
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return {}
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if SCons.Util.is_Sequence(cppdefines):
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result = {}
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for c in cppdefines:
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if SCons.Util.is_Sequence(c):
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result[c[0]] = c[1]
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else:
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result[c] = None
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return result
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if not SCons.Util.is_Dict(cppdefines):
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return {cppdefines : None}
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return cppdefines
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class SConsCPPScannerWrapper:
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"""
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The SCons wrapper around a cpp.py scanner.
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This is the actual glue between the calling conventions of generic
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SCons scanners, and the (subclass of) cpp.py class that knows how
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to look for #include lines with reasonably real C-preprocessor-like
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evaluation of #if/#ifdef/#else/#elif lines.
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"""
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def __init__(self, name, variable):
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self.name = name
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self.path = SCons.Scanner.FindPathDirs(variable)
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def __call__(self, node, env, path = ()):
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cpp = SConsCPPScanner(current = node.get_dir(),
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cpppath = path,
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dict = dictify_CPPDEFINES(env))
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result = cpp(node)
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for included, includer in cpp.missing:
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fmt = "No dependency generated for file: %s (included from: %s) -- file not found"
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SCons.Warnings.warn(SCons.Warnings.DependencyWarning,
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fmt % (included, includer))
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return result
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def recurse_nodes(self, nodes):
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return nodes
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def select(self, node):
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return self
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def CScanner():
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"""Return a prototype Scanner instance for scanning source files
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that use the C pre-processor"""
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# Here's how we would (or might) use the CPP scanner code above that
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# knows how to evaluate #if/#ifdef/#else/#elif lines when searching
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# for #includes. This is commented out for now until we add the
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# right configurability to let users pick between the scanners.
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#return SConsCPPScannerWrapper("CScanner", "CPPPATH")
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cs = SCons.Scanner.ClassicCPP("CScanner",
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"$CPPSUFFIXES",
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"CPPPATH",
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'^[ \t]*#[ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")')
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return cs
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