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#.rst:
# FindBISON
# ---------
#
# Find ``bison`` executable and provide a macro 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 macro::
#
# BISON_TARGET(<Name> <YaccInput> <CodeOutput>
# [COMPILE_FLAGS <flags>]
# [DEFINES_FILE <file>]
# [VERBOSE <file>]
# )
#
# 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.
#
# The options are:
#
# ``COMPILE_FLAGS <flags>``
# Specify flags to be added to the ``bison`` command line.
#
# ``DEFINES_FILE <file>``
# Specify a non-default header ``<file>`` to be generated by ``bison``.
#
# ``VERBOSE <file>``
# Tell ``bison`` to write verbose descriptions of the grammar and
# parser to the given ``<file>``.
#
# The macro defines the following 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 usage:
#
# .. code-block:: cmake
#
# find_package(BISON)
# BISON_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp
# DEFINES_FILE ${CMAKE_CURRENT_BINARY_DIR}/parser.h)
# add_executable(Foo main.cpp ${BISON_MyParser_OUTPUTS})
#=============================================================================
# Copyright 2009 Kitware, Inc.
# Copyright 2006 Tristan Carel
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
find_program(BISON_EXECUTABLE NAMES bison win_bison DOC "path to the bison executable")
mark_as_advanced(BISON_EXECUTABLE)
include(CMakeParseArguments)
if(BISON_EXECUTABLE)
# the bison commands should be executed with the C locale, otherwise
# the message (which are parsed) may be translated
set(_Bison_SAVED_LC_ALL "$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\\+\\+ Version ([^,]+)")
set(BISON_VERSION "${CMAKE_MATCH_1}")
# GNU Bison
elseif("${BISON_version_output}" MATCHES "^bison \\(GNU Bison\\) ([^\n]+)\n")
set(BISON_VERSION "${CMAKE_MATCH_1}")
elseif("${BISON_version_output}" MATCHES "^GNU Bison (version )?([^\n]+)")
set(BISON_VERSION "${CMAKE_MATCH_2}")
endif()
endif()
# internal macro
macro(BISON_TARGET_option_verbose Name BisonOutput filename)
list(APPEND BISON_TARGET_cmdopt "--verbose")
get_filename_component(BISON_TARGET_output_path "${BisonOutput}" PATH)
get_filename_component(BISON_TARGET_output_name "${BisonOutput}" NAME_WE)
add_custom_command(OUTPUT ${filename}
COMMAND ${CMAKE_COMMAND} -E copy
"${BISON_TARGET_output_path}/${BISON_TARGET_output_name}.output"
"${filename}"
VERBATIM
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 ${BISON_TARGET_extraopts})
endmacro()
# internal macro
macro(BISON_TARGET_option_defines Header)
set(BISON_TARGET_output_header "${Header}")
list(APPEND BISON_TARGET_cmdopt --defines=${BISON_TARGET_output_header})
endmacro()
#============================================================
# BISON_TARGET (public macro)
#============================================================
#
macro(BISON_TARGET Name BisonInput BisonOutput)
set(BISON_TARGET_output_header "")
set(BISON_TARGET_cmdopt "")
set(BISON_TARGET_outputs "${BisonOutput}")
# Parsing parameters
set(BISON_TARGET_PARAM_OPTIONS)
set(BISON_TARGET_PARAM_ONE_VALUE_KEYWORDS
VERBOSE
COMPILE_FLAGS
DEFINES_FILE
)
set(BISON_TARGET_PARAM_MULTI_VALUE_KEYWORDS)
cmake_parse_arguments(
BISON_TARGET_ARG
"${BISON_TARGET_PARAM_OPTIONS}"
"${BISON_TARGET_PARAM_ONE_VALUE_KEYWORDS}"
"${BISON_TARGET_PARAM_MULTI_VALUE_KEYWORDS}"
${ARGN}
)
if(NOT "${BISON_TARGET_ARG_UNPARSED_ARGUMENTS}" STREQUAL "")
message(SEND_ERROR "Usage")
else()
if(NOT "${BISON_TARGET_ARG_VERBOSE}" STREQUAL "")
BISON_TARGET_option_verbose(${Name} ${BisonOutput} "${BISON_TARGET_ARG_VERBOSE}")
endif()
if(NOT "${BISON_TARGET_ARG_COMPILE_FLAGS}" STREQUAL "")
BISON_TARGET_option_extraopts("${BISON_TARGET_ARG_COMPILE_FLAGS}")
endif()
if(NOT "${BISON_TARGET_ARG_DEFINES_FILE}" STREQUAL "")
BISON_TARGET_option_defines("${BISON_TARGET_ARG_DEFINES_FILE}")
endif()
if("${BISON_TARGET_output_header}" STREQUAL "")
# Header's name generated by bison (see option -d)
list(APPEND BISON_TARGET_cmdopt "-d")
string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\2" _fileext "${BisonOutput}")
string(REPLACE "c" "h" _fileext ${_fileext})
string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\1${_fileext}"
BISON_TARGET_output_header "${BisonOutput}")
endif()
list(APPEND BISON_TARGET_outputs "${BISON_TARGET_output_header}")
add_custom_command(OUTPUT ${BISON_TARGET_outputs}
${BISON_TARGET_extraoutputs}
COMMAND ${BISON_EXECUTABLE} ${BISON_TARGET_cmdopt} -o ${BisonOutput} ${BisonInput}
VERBATIM
DEPENDS ${BisonInput}
COMMENT "[BISON][${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 ${BisonInput})
set(BISON_${Name}_OUTPUTS ${BISON_TARGET_outputs})
set(BISON_${Name}_COMPILE_FLAGS ${BISON_TARGET_cmdopt})
set(BISON_${Name}_OUTPUT_SOURCE "${BisonOutput}")
set(BISON_${Name}_OUTPUT_HEADER "${BISON_TARGET_output_header}")
endif()
endmacro()
#
#============================================================
endif()
include(${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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