"""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 The SCons Foundation
#
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# 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.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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__revision__ = "/home/scons/scons/branch.0/baseline/src/engine/SCons/Tool/lex.py 0.96.1.D001 2004/08/23 09:55:29 knight"

import SCons.Defaults
import SCons.Tool
import SCons.Util

def generate(env):
    """Add Builders and construction variables for lex to an Environment."""
    c_file, cxx_file = SCons.Tool.createCFileBuilders(env)

    c_file.add_action('.l', SCons.Defaults.LexAction)
    cxx_file.add_action('.ll', SCons.Defaults.LexAction)

    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'])