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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}/${BISON_TARGET_output_name}.output")
endmacro()
# internal macro
macro(BISON_TARGET_option_extraopts Options)
set(BISON_TARGET_extraopts "${Options}")
separate_arguments(BISON_TARGET_extraopts)
list(APPEND BISON_TARGET_cmdopt ${BISON_TARGET_extraopts})
endmacro()
#============================================================
# BISON_TARGET (public macro)
#============================================================
#
macro(BISON_TARGET Name BisonInput BisonOutput)
set(BISON_TARGET_output_header "")
set(BISON_TARGET_cmdopt "")
set(BISON_TARGET_outputs "${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 "${BisonOutput}")
endif()
endmacro()
#
#============================================================
endif()
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(BISON REQUIRED_VARS BISON_EXECUTABLE
VERSION_VAR BISON_VERSION)
# FindBISON.cmake ends here
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