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94 lines
3.2 KiB
94 lines
3.2 KiB
16 years ago
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"""SCons.Tool.lex
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Tool-specific initialization for lex.
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There normally shouldn't be any need to import this module directly.
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It will usually be imported through the generic SCons.Tool.Tool()
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selection method.
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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/Tool/lex.py 3842 2008/12/20 22:59:52 scons"
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import os.path
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import string
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import SCons.Action
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import SCons.Tool
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import SCons.Util
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LexAction = SCons.Action.Action("$LEXCOM", "$LEXCOMSTR")
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def lexEmitter(target, source, env):
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sourceBase, sourceExt = os.path.splitext(SCons.Util.to_String(source[0]))
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if sourceExt == ".lm": # If using Objective-C
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target = [sourceBase + ".m"] # the extension is ".m".
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# This emitter essentially tries to add to the target all extra
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# files generated by flex.
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# Different options that are used to trigger the creation of extra files.
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fileGenOptions = ["--header-file=", "--tables-file="]
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lexflags = env.subst("$LEXFLAGS", target=target, source=source)
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for option in SCons.Util.CLVar(lexflags):
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for fileGenOption in fileGenOptions:
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l = len(fileGenOption)
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if option[:l] == fileGenOption:
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# A file generating option is present, so add the
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# file name to the target list.
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fileName = string.strip(option[l:])
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target.append(fileName)
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return (target, source)
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def generate(env):
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"""Add Builders and construction variables for lex to an Environment."""
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c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
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# C
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c_file.add_action(".l", LexAction)
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c_file.add_emitter(".l", lexEmitter)
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c_file.add_action(".lex", LexAction)
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c_file.add_emitter(".lex", lexEmitter)
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# Objective-C
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cxx_file.add_action(".lm", LexAction)
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cxx_file.add_emitter(".lm", lexEmitter)
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# C++
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cxx_file.add_action(".ll", LexAction)
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cxx_file.add_emitter(".ll", lexEmitter)
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env["LEX"] = env.Detect("flex") or "lex"
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env["LEXFLAGS"] = SCons.Util.CLVar("")
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env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
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def exists(env):
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return env.Detect(["flex", "lex"])
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