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# - Find lex executable and provides a macro to generate custom build rules
#
# The module defines the following variables:
# LEX_FOUND - true is lex executable is found
# LEX_EXECUTABLE - the path to the lex executable
# LEX_LIBRARIES - The lex libraries
# LEX_INCLUDE_DIRS - The path to the lex headers
#
#
# If lex is found on the system, the module provides the macro:
# LEX_TARGET(Name LexInput LexOutput [COMPILE_FLAGS <string>])
# which creates a custom command to generate the <LexOutput> file from
# the <LexInput> file. If COMPILE_FLAGS option is specified, the next
# parameter is added to the lex command line. Name is an alias used to
# get details of this custom command. Indeed the macro defines the
# following variables:
# LEX_${Name}_DEFINED - true is the macro ran successfully
# LEX_${Name}_OUTPUTS - the source file generated by the custom rule, an
# alias for LexOutput
# LEX_${Name}_INPUT - the lex source file, an alias for ${LexInput}
#
# Lex scanners oftenly use tokens defined by Yacc: the code generated
# by Lex depends of the header generated by Yacc. This module also
# defines a macro:
# ADD_LEX_YACC_DEPENDENCY(LexTarget YaccTarget)
# which adds the required dependency between a scanner and a parser
# where <LexTarget> and <YaccTarget> are the first parameters of
# respectively LEX_TARGET and YACC_TARGET macros.
#
# ====================================================================
#=============================================================================
# Copyright 2009 Kitware, Inc.
# Copyright 2006 Tristan Carel
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# This file is based on the FindFLEX CMake macro, and adapted by ECMWF
#=============================================================================
# (C) Copyright 2011- ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation nor
# does it submit to any jurisdiction.
FIND_PROGRAM(LEX_EXECUTABLE lex DOC "path to the lex executable")
MARK_AS_ADVANCED(LEX_EXECUTABLE)
FIND_LIBRARY(FL_LIBRARY NAMES fl
DOC "Path to the fl library")
FIND_PATH(LEX_INCLUDE_DIR LexLexer.h
DOC "Path to the lex headers")
MARK_AS_ADVANCED(FL_LIBRARY LEX_INCLUDE_DIR)
SET(LEX_INCLUDE_DIRS ${LEX_INCLUDE_DIR})
SET(LEX_LIBRARIES ${FL_LIBRARY})
IF(LEX_EXECUTABLE)
#============================================================
# LEX_TARGET (public macro)
#============================================================
#
MACRO(LEX_TARGET Name Input Output)
SET(LEX_TARGET_usage "LEX_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>]")
IF(${ARGC} GREATER 3)
IF(${ARGC} EQUAL 5)
IF("${ARGV3}" STREQUAL "COMPILE_FLAGS")
SET(LEX_EXECUTABLE_opts "${ARGV4}")
SEPARATE_ARGUMENTS(LEX_EXECUTABLE_opts)
ELSE()
MESSAGE(SEND_ERROR ${LEX_TARGET_usage})
ENDIF()
ELSE()
MESSAGE(SEND_ERROR ${LEX_TARGET_usage})
ENDIF()
ENDIF()
message( STATUS "${LEX_EXECUTABLE} ${LEX_EXECUTABLE_opts} -t ${Input} > ${Output}" )
ADD_CUSTOM_COMMAND(OUTPUT ${Output}
COMMAND ${LEX_EXECUTABLE} ${LEX_EXECUTABLE_opts} -t ${Input} > ${Output}
DEPENDS ${Input}
COMMENT "[LEX][${Name}] Building scanner with lex ${LEX_VERSION}"
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
SET(LEX_${Name}_DEFINED TRUE)
SET(LEX_${Name}_OUTPUTS ${Output})
SET(LEX_${Name}_INPUT ${Input})
SET(LEX_${Name}_COMPILE_FLAGS ${LEX_EXECUTABLE_opts})
ENDMACRO(LEX_TARGET)
#============================================================
#============================================================
# ADD_LEX_YACC_DEPENDENCY (public macro)
#============================================================
#
MACRO(ADD_LEX_YACC_DEPENDENCY LexTarget YaccTarget)
IF(NOT LEX_${LexTarget}_OUTPUTS)
MESSAGE(SEND_ERROR "Lex target `${LexTarget}' does not exists.")
ENDIF()
IF(NOT YACC_${YaccTarget}_OUTPUT_HEADER)
MESSAGE(SEND_ERROR "Yacc target `${YaccTarget}' does not exists.")
ENDIF()
SET_SOURCE_FILES_PROPERTIES(${LEX_${LexTarget}_OUTPUTS}
PROPERTIES OBJECT_DEPENDS ${YACC_${YaccTarget}_OUTPUT_HEADER})
ENDMACRO(ADD_LEX_YACC_DEPENDENCY)
#============================================================
ENDIF(LEX_EXECUTABLE)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(LEX REQUIRED_VARS LEX_EXECUTABLE)
# FindLEX.cmake ends here
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