3 Tool-specific initialization for lex.
5 There normally shouldn't be any need to import this module directly.
6 It will usually be imported through the generic SCons.Tool.Tool()
12 # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
14 # Permission is hereby granted, free of charge, to any person obtaining
15 # a copy of this software and associated documentation files (the
16 # "Software"), to deal in the Software without restriction, including
17 # without limitation the rights to use, copy, modify, merge, publish,
18 # distribute, sublicense, and/or sell copies of the Software, and to
19 # permit persons to whom the Software is furnished to do so, subject to
20 # the following conditions:
22 # The above copyright notice and this permission notice shall be included
23 # in all copies or substantial portions of the Software.
25 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
26 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
27 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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34 __revision__ = "src/engine/SCons/Tool/lex.py 3842 2008/12/20 22:59:52 scons"
44 LexAction = SCons.Action.Action("$LEXCOM", "$LEXCOMSTR")
46 def lexEmitter(target, source, env):
47 sourceBase, sourceExt = os.path.splitext(SCons.Util.to_String(source[0]))
49 if sourceExt == ".lm": # If using Objective-C
50 target = [sourceBase + ".m"] # the extension is ".m".
52 # This emitter essentially tries to add to the target all extra
53 # files generated by flex.
55 # Different options that are used to trigger the creation of extra files.
56 fileGenOptions = ["--header-file=", "--tables-file="]
58 lexflags = env.subst("$LEXFLAGS", target=target, source=source)
59 for option in SCons.Util.CLVar(lexflags):
60 for fileGenOption in fileGenOptions:
61 l = len(fileGenOption)
62 if option[:l] == fileGenOption:
63 # A file generating option is present, so add the
64 # file name to the target list.
65 fileName = string.strip(option[l:])
66 target.append(fileName)
67 return (target, source)
70 """Add Builders and construction variables for lex to an Environment."""
71 c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
74 c_file.add_action(".l", LexAction)
75 c_file.add_emitter(".l", lexEmitter)
77 c_file.add_action(".lex", LexAction)
78 c_file.add_emitter(".lex", lexEmitter)
81 cxx_file.add_action(".lm", LexAction)
82 cxx_file.add_emitter(".lm", lexEmitter)
85 cxx_file.add_action(".ll", LexAction)
86 cxx_file.add_emitter(".ll", lexEmitter)
88 env["LEX"] = env.Detect("flex") or "lex"
89 env["LEXFLAGS"] = SCons.Util.CLVar("")
90 env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
93 return env.Detect(["flex", "lex"])