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"""SCons.Scanner.C
This module implements the depenency scanner for C/C++ code.
"""
#
# __COPYRIGHT__
#
# 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 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
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