yacc.py
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上传日期:2018-11-18
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- """SCons.Tool.yacc
- Tool-specific initialization for yacc.
- There normally shouldn't be any need to import this module directly.
- It will usually be imported through the generic SCons.Tool.Tool()
- selection method.
- """
- #
- # 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/Tool/yacc.py 3057 2008/06/09 22:21:00 knight"
- import os.path
- import string
- import SCons.Defaults
- import SCons.Tool
- import SCons.Util
- YaccAction = SCons.Action.Action("$YACCCOM", "$YACCCOMSTR")
- def _yaccEmitter(target, source, env, ysuf, hsuf):
- yaccflags = env.subst("$YACCFLAGS", target=target, source=source)
- flags = SCons.Util.CLVar(yaccflags)
- targetBase, targetExt = os.path.splitext(SCons.Util.to_String(target[0]))
- if '.ym' in ysuf: # If using Objective-C
- target = [targetBase + ".m"] # the extension is ".m".
- # If -d is specified on the command line, yacc will emit a .h
- # or .hpp file with the same name as the .c or .cpp output file.
- if '-d' in flags:
- target.append(targetBase + env.subst(hsuf, target=target, source=source))
- # If -g is specified on the command line, yacc will emit a .vcg
- # file with the same base name as the .y, .yacc, .ym or .yy file.
- if "-g" in flags:
- base, ext = os.path.splitext(SCons.Util.to_String(source[0]))
- target.append(base + env.subst("$YACCVCGFILESUFFIX"))
- # With --defines and --graph, the name of the file is totally defined
- # in the options.
- fileGenOptions = ["--defines=", "--graph="]
- for option in flags:
- for fileGenOption in fileGenOptions:
- l = len(fileGenOption)
- if option[:l] == fileGenOption:
- # A file generating option is present, so add the file
- # name to the list of targets.
- fileName = string.strip(option[l:])
- target.append(fileName)
- return (target, source)
- def yEmitter(target, source, env):
- return _yaccEmitter(target, source, env, ['.y', '.yacc'], '$YACCHFILESUFFIX')
- def ymEmitter(target, source, env):
- return _yaccEmitter(target, source, env, ['.ym'], '$YACCHFILESUFFIX')
- def yyEmitter(target, source, env):
- return _yaccEmitter(target, source, env, ['.yy'], '$YACCHXXFILESUFFIX')
- def generate(env):
- """Add Builders and construction variables for yacc to an Environment."""
- c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
- # C
- c_file.add_action('.y', YaccAction)
- c_file.add_emitter('.y', yEmitter)
- c_file.add_action('.yacc', YaccAction)
- c_file.add_emitter('.yacc', yEmitter)
- # Objective-C
- c_file.add_action('.ym', YaccAction)
- c_file.add_emitter('.ym', ymEmitter)
- # C++
- cxx_file.add_action('.yy', YaccAction)
- cxx_file.add_emitter('.yy', yyEmitter)
- env['YACC'] = env.Detect('bison') or 'yacc'
- env['YACCFLAGS'] = SCons.Util.CLVar('')
- env['YACCCOM'] = '$YACC $YACCFLAGS -o $TARGET $SOURCES'
- env['YACCHFILESUFFIX'] = '.h'
- if env['PLATFORM'] == 'darwin':
- # Bison on Mac OS X just appends ".h" to the generated target .cc
- # or .cpp file name. Hooray for delayed expansion of variables.
- env['YACCHXXFILESUFFIX'] = '${TARGET.suffix}.h'
- else:
- env['YACCHXXFILESUFFIX'] = '.hpp'
- env['YACCVCGFILESUFFIX'] = '.vcg'
- def exists(env):
- return env.Detect(['bison', 'yacc'])