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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__
#
# 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__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
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"])
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