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+"""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, 2009 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 4577 2009/12/27 19:43:56 scons"
+
+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"])
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: