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()
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
29 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
30 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
31 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
34 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
42 LexAction = SCons.Action.Action("$LEXCOM", "$LEXCOMSTR")
44 def lexEmitter(target, source, env):
45 sourceBase, sourceExt = os.path.splitext(SCons.Util.to_String(source[0]))
47 if sourceExt == ".lm": # If using Objective-C
48 target = [sourceBase + ".m"] # the extension is ".m".
50 # This emitter essentially tries to add to the target all extra
51 # files generated by flex.
53 # Different options that are used to trigger the creation of extra files.
54 fileGenOptions = ["--header-file=", "--tables-file="]
56 lexflags = env.subst("$LEXFLAGS", target=target, source=source)
57 for option in SCons.Util.CLVar(lexflags):
58 for fileGenOption in fileGenOptions:
59 l = len(fileGenOption)
60 if option[:l] == fileGenOption:
61 # A file generating option is present, so add the
62 # file name to the target list.
63 fileName = option[l:].strip()
64 target.append(fileName)
65 return (target, source)
68 """Add Builders and construction variables for lex to an Environment."""
69 c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
72 c_file.add_action(".l", LexAction)
73 c_file.add_emitter(".l", lexEmitter)
75 c_file.add_action(".lex", LexAction)
76 c_file.add_emitter(".lex", lexEmitter)
79 cxx_file.add_action(".lm", LexAction)
80 cxx_file.add_emitter(".lm", lexEmitter)
83 cxx_file.add_action(".ll", LexAction)
84 cxx_file.add_emitter(".ll", lexEmitter)
86 env["LEX"] = env.Detect("flex") or "lex"
87 env["LEXFLAGS"] = SCons.Util.CLVar("")
88 env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
91 return env.Detect(["flex", "lex"])
95 # indent-tabs-mode:nil
97 # vim: set expandtab tabstop=4 shiftwidth=4: