C.py
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上传日期:2018-11-18
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文件大小:5k
- """SCons.Scanner.C
- This module implements the depenency scanner for C/C++ code.
- """
- #
- # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 3057 2008/06/09 22:21:00 knight"
- 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):
- apply(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:
- """
- 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