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+# - Find bison executable and provides macros to generate custom build rules
+# The module defines the following variables:
+#
+# BISON_EXECUTABLE - path to the bison program
+# BISON_VERSION - version of bison
+# BISON_FOUND - true if the program was found
+#
+# The minimum required version of bison can be specified using the
+# standard CMake syntax, e.g. find_package(BISON 2.1.3)
+#
+# If bison is found, the module defines the macros:
+# BISON_TARGET(<Name> <YaccInput> <CodeOutput> [VERBOSE <file>]
+# [COMPILE_FLAGS <string>])
+# which will create a custom rule to generate a parser. <YaccInput> is
+# the path to a yacc file. <CodeOutput> is the name of the source file
+# generated by bison. A header file is also be generated, and contains
+# the token list. If COMPILE_FLAGS option is specified, the next
+# parameter is added in the bison command line. if VERBOSE option is
+# specified, <file> is created and contains verbose descriptions of the
+# grammar and parser. The macro defines a set of variables:
+# BISON_${Name}_DEFINED - true is the macro ran successfully
+# BISON_${Name}_INPUT - The input source file, an alias for <YaccInput>
+# BISON_${Name}_OUTPUT_SOURCE - The source file generated by bison
+# BISON_${Name}_OUTPUT_HEADER - The header file generated by bison
+# BISON_${Name}_OUTPUTS - The sources files generated by bison
+# BISON_${Name}_COMPILE_FLAGS - Options used in the bison command line
+#
+# ====================================================================
+# Example:
+#
+# find_package(BISON)
+# BISON_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp)
+# add_executable(Foo main.cpp ${BISON_MyParser_OUTPUTS})
+# ====================================================================
+
+#=============================================================================
+# Copyright 2009 Kitware, Inc.
+# Copyright 2006 Tristan Carel
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+# License text for the above reference.)
+
+FIND_PROGRAM(BISON_EXECUTABLE bison DOC "path to the bison executable")
+MARK_AS_ADVANCED(BISON_EXECUTABLE)
+
+IF(BISON_EXECUTABLE)
+ # the bison commands should be executed with the C locale, otherwise
+ # the message (which are parsed) may be translated
+ SET(_Bison_SAVED_LC_ALL "$ENV{LC_ALL}")
+ SET(ENV{LC_ALL} C)
+
+ EXECUTE_PROCESS(COMMAND ${BISON_EXECUTABLE} --version
+ OUTPUT_VARIABLE BISON_version_output
+ ERROR_VARIABLE BISON_version_error
+ RESULT_VARIABLE BISON_version_result
+ OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+ SET(ENV{LC_ALL} ${_Bison_SAVED_LC_ALL})
+
+ IF(NOT ${BISON_version_result} EQUAL 0)
+ MESSAGE(SEND_ERROR "Command \"${BISON_EXECUTABLE} --version\" failed with output:\n${BISON_version_error}")
+ ELSE()
+ # Bison++
+ IF("${BISON_version_output}" MATCHES "^bison\\+\\+")
+ STRING(REGEX REPLACE "^bison\\+\\+ Version ([^,]+).*" "\\1"
+ BISON_VERSION "${BISON_version_output}")
+ # GNU Bison
+ ELSEIF("${BISON_version_output}" MATCHES "^bison[^+]")
+ STRING(REGEX REPLACE "^bison \\(GNU Bison\\) ([^\n]+)\n.*" "\\1"
+ BISON_VERSION "${BISON_version_output}")
+ ELSEIF("${BISON_version_output}" MATCHES "^GNU Bison ")
+ STRING(REGEX REPLACE "^GNU Bison (version )?([^\n]+).*" "\\2"
+ BISON_VERSION "${BISON_version_output}")
+ ENDIF()
+ ENDIF()
+
+ # internal macro
+ MACRO(BISON_TARGET_option_verbose Name BisonOutput filename)
+ LIST(APPEND BISON_TARGET_cmdopt "--verbose")
+ GET_FILENAME_COMPONENT(BISON_TARGET_output_path "${BisonOutput}" PATH)
+ GET_FILENAME_COMPONENT(BISON_TARGET_output_name "${BisonOutput}" NAME_WE)
+ ADD_CUSTOM_COMMAND(OUTPUT ${filename}
+ COMMAND ${CMAKE_COMMAND}
+ ARGS -E copy
+ "${BISON_TARGET_output_path}/${BISON_TARGET_output_name}.output"
+ "${filename}"
+ DEPENDS
+ "${BISON_TARGET_output_path}/${BISON_TARGET_output_name}.output"
+ COMMENT "[BISON][${Name}] Copying bison verbose table to ${filename}"
+ WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
+ SET(BISON_${Name}_VERBOSE_FILE ${filename})
+ LIST(APPEND BISON_TARGET_extraoutputs
+ "${BISON_TARGET_output_path}/${BISON_TARGET_output_name}.output")
+ ENDMACRO(BISON_TARGET_option_verbose)
+
+ # internal macro
+ MACRO(BISON_TARGET_option_extraopts Options)
+ SET(BISON_TARGET_extraopts "${Options}")
+ SEPARATE_ARGUMENTS(BISON_TARGET_extraopts)
+ LIST(APPEND BISON_TARGET_cmdopt ${BISON_TARGET_extraopts})
+ ENDMACRO(BISON_TARGET_option_extraopts)
+
+ #============================================================
+ # BISON_TARGET (public macro)
+ #============================================================
+ #
+ MACRO(BISON_TARGET Name BisonInput BisonOutput)
+ SET(BISON_TARGET_output_header "")
+ SET(BISON_TARGET_cmdopt "")
+ SET(BISON_TARGET_outputs "${BisonOutput}")
+ IF(NOT ${ARGC} EQUAL 3 AND NOT ${ARGC} EQUAL 5 AND NOT ${ARGC} EQUAL 7)
+ MESSAGE(SEND_ERROR "Usage")
+ ELSE()
+ # Parsing parameters
+ IF(${ARGC} GREATER 5 OR ${ARGC} EQUAL 5)
+ IF("${ARGV3}" STREQUAL "VERBOSE")
+ BISON_TARGET_option_verbose(${Name} ${BisonOutput} "${ARGV4}")
+ ENDIF()
+ IF("${ARGV3}" STREQUAL "COMPILE_FLAGS")
+ BISON_TARGET_option_extraopts("${ARGV4}")
+ ENDIF()
+ ENDIF()
+
+ IF(${ARGC} EQUAL 7)
+ IF("${ARGV5}" STREQUAL "VERBOSE")
+ BISON_TARGET_option_verbose(${Name} ${BisonOutput} "${ARGV6}")
+ ENDIF()
+
+ IF("${ARGV5}" STREQUAL "COMPILE_FLAGS")
+ BISON_TARGET_option_extraopts("${ARGV6}")
+ ENDIF()
+ ENDIF()
+
+ # Header's name generated by bison (see option -d)
+ LIST(APPEND BISON_TARGET_cmdopt "-d")
+ STRING(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\2" _fileext "${ARGV2}")
+ STRING(REPLACE "c" "h" _fileext ${_fileext})
+ STRING(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\1${_fileext}"
+ BISON_${Name}_OUTPUT_HEADER "${ARGV2}")
+ LIST(APPEND BISON_TARGET_outputs "${BISON_${Name}_OUTPUT_HEADER}")
+
+ ADD_CUSTOM_COMMAND(OUTPUT ${BISON_TARGET_outputs}
+ ${BISON_TARGET_extraoutputs}
+ COMMAND ${BISON_EXECUTABLE}
+ ARGS ${BISON_TARGET_cmdopt} -o ${ARGV2} ${ARGV1}
+ DEPENDS ${ARGV1}
+ COMMENT "[BISON][${Name}] Building parser with bison ${BISON_VERSION}"
+ WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+
+ # define target variables
+ SET(BISON_${Name}_DEFINED TRUE)
+ SET(BISON_${Name}_INPUT ${ARGV1})
+ SET(BISON_${Name}_OUTPUTS ${BISON_TARGET_outputs})
+ SET(BISON_${Name}_COMPILE_FLAGS ${BISON_TARGET_cmdopt})
+ SET(BISON_${Name}_OUTPUT_SOURCE "${BisonOutput}")
+
+ ENDIF(NOT ${ARGC} EQUAL 3 AND NOT ${ARGC} EQUAL 5 AND NOT ${ARGC} EQUAL 7)
+ ENDMACRO(BISON_TARGET)
+ #
+ #============================================================
+
+ENDIF(BISON_EXECUTABLE)
+
+INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(BISON REQUIRED_VARS BISON_EXECUTABLE
+ VERSION_VAR BISON_VERSION)
+
+# FindBISON.cmake ends here