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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 - 2019 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 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
import os.path
import sys
import SCons.Action
import SCons.Tool
import SCons.Util
from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
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("$LEXFLAGS", target=target, source=source)
for option in SCons.Util.CLVar(lexflags):
for fileGenOption in fileGenOptions:
l = len(fileGenOption)
if option[:l] == fileGenOption:
# A file generating option is present, so add the
# file name to the target list.
fileName = option[l:].strip()
target.append(fileName)
return (target, source)
def get_lex_path(env, append_paths=False):
"""
Find the a path containing the lex or flex binaries. If a construction
environment is passed in then append the path to the ENV PATH.
"""
# save existing path to reset if we don't want to append any paths
envPath = env['ENV']['PATH']
bins = ['flex', 'lex', 'win_flex']
for prog in bins:
bin_path = SCons.Tool.find_program_path(
env,
prog,
default_paths=CHOCO_DEFAULT_PATH + MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
if bin_path:
if not append_paths:
env['ENV']['PATH'] = envPath
else:
env.AppendENVPath('PATH', os.path.dirname(bin_path))
return bin_path
SCons.Warnings.Warning('lex tool requested, but lex or flex binary not found in ENV PATH')
def generate(env):
"""Add Builders and construction variables for lex to an Environment."""
c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
# C
c_file.add_action(".l", LexAction)
c_file.add_emitter(".l", lexEmitter)
c_file.add_action(".lex", LexAction)
c_file.add_emitter(".lex", lexEmitter)
# Objective-C
cxx_file.add_action(".lm", LexAction)
cxx_file.add_emitter(".lm", lexEmitter)
# C++
cxx_file.add_action(".ll", LexAction)
cxx_file.add_emitter(".ll", lexEmitter)
env["LEXFLAGS"] = SCons.Util.CLVar("")
if sys.platform == 'win32':
get_lex_path(env, append_paths=True)
env["LEX"] = env.Detect(['flex', 'lex', 'win_flex'])
if not env.get("LEXUNISTD"):
env["LEXUNISTD"] = SCons.Util.CLVar("")
env["LEXCOM"] = "$LEX $LEXUNISTD $LEXFLAGS -t $SOURCES > $TARGET"
else:
env["LEX"] = env.Detect(["flex", "lex"])
env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
def exists(env):
if sys.platform == 'win32':
return get_lex_path(env)
else:
return env.Detect(["flex", "lex"])
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4:
|
