lex.py
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上传日期:2018-11-18
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文件大小:3k
- """SCons.Tool.lex
- Tool-specific initialization for lex.
- 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/lex.py 3057 2008/06/09 22:21:00 knight"
- import os.path
- import string
- import SCons.Action
- import SCons.Tool
- import SCons.Util
- LexAction = SCons.Action.Action("$LEXCOM", "$LEXCOMSTR")
- def lexEmitter(target, source, env):
- sourceBase, sourceExt = os.path.splitext(SCons.Util.to_String(source[0]))
- if sourceExt == ".lm": # If using Objective-C
- target = [sourceBase + ".m"] # the extension is ".m".
- # This emitter essentially tries to add to the target all extra
- # files generated by flex.
- # Different options that are used to trigger the creation of extra files.
- fileGenOptions = ["--header-file=", "--tables-file="]
- lexflags = env.subst("$LEXFLAGS", target=target, source=source)
- for option in SCons.Util.CLVar(lexflags):
- for fileGenOption in fileGenOptions:
- l = len(fileGenOption)
- if option[:l] == fileGenOption:
- # A file generating option is present, so add the
- # file name to the target list.
- fileName = string.strip(option[l:])
- target.append(fileName)
- return (target, source)
- def generate(env):
- """Add Builders and construction variables for lex to an Environment."""
- c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
- # C
- c_file.add_action(".l", LexAction)
- c_file.add_emitter(".l", lexEmitter)
- c_file.add_action(".lex", LexAction)
- c_file.add_emitter(".lex", lexEmitter)
- # Objective-C
- cxx_file.add_action(".lm", LexAction)
- cxx_file.add_emitter(".lm", lexEmitter)
- # C++
- cxx_file.add_action(".ll", LexAction)
- cxx_file.add_emitter(".ll", lexEmitter)
- env["LEX"] = env.Detect("flex") or "lex"
- env["LEXFLAGS"] = SCons.Util.CLVar("")
- env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
- def exists(env):
- return env.Detect(["flex", "lex"])