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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.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>]]
# [REPORT_FILE <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 a report file of the grammar and parser.
# If ``<file>`` is given, it specifies path the report file is copied to.
# ``[<file>]`` is left for backward compatibility of this module.
# Use ``VERBOSE REPORT_FILE <file>``.
#
# ``REPORT_FILE <file>``
# Specify a non-default report ``<file>``, if generated.
#
# 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``
# All files generated by bison including the source, the header and the report
#
# ``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 ${BISON_MyParser_OUTPUTS})
find_program(BISON_EXECUTABLE NAMES bison win_bison DOC "path to the bison executable")
mark_as_advanced(BISON_EXECUTABLE)
include(CMakeParseArguments)
if(BISON_EXECUTABLE)
# the bison commands should be executed with the C locale, otherwise
# the message (which are parsed) may be translated
set(_Bison_SAVED_LC_ALL "$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 "${CMAKE_MATCH_2}")
endif()
endif()
# internal macro
# sets BISON_TARGET_cmdopt
macro(BISON_TARGET_option_extraopts Options)
set(BISON_TARGET_cmdopt "")
set(BISON_TARGET_extraopts "${Options}")
separate_arguments(BISON_TARGET_extraopts)
list(APPEND BISON_TARGET_cmdopt ${BISON_TARGET_extraopts})
endmacro()
# internal macro
# sets BISON_TARGET_output_header and BISON_TARGET_cmdopt
macro(BISON_TARGET_option_defines BisonOutput Header)
if("${Header}" STREQUAL "")
# default header path generated by bison (see option -d)
string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\2" _fileext "${BisonOutput}")
string(REPLACE "c" "h" _fileext ${_fileext})
string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\1${_fileext}"
BISON_TARGET_output_header "${BisonOutput}")
list(APPEND BISON_TARGET_cmdopt "-d")
else()
set(BISON_TARGET_output_header "${Header}")
list(APPEND BISON_TARGET_cmdopt "--defines=${BISON_TARGET_output_header}")
endif()
endmacro()
# internal macro
# sets BISON_TARGET_verbose_file and BISON_TARGET_cmdopt
macro(BISON_TARGET_option_report_file BisonOutput ReportFile)
if("${ReportFile}" STREQUAL "")
get_filename_component(BISON_TARGET_output_path "${BisonOutput}" PATH)
get_filename_component(BISON_TARGET_output_name "${BisonOutput}" NAME_WE)
set(BISON_TARGET_verbose_file
"${BISON_TARGET_output_path}/${BISON_TARGET_output_name}.output")
else()
set(BISON_TARGET_verbose_file "${ReportFile}")
list(APPEND BISON_TARGET_cmdopt "--report-file=${BISON_TARGET_verbose_file}")
endif()
endmacro()
# internal macro
# adds a custom command and sets
# BISON_TARGET_cmdopt, BISON_TARGET_verbose_file, BISON_TARGET_extraoutputs
macro(BISON_TARGET_option_verbose Name BisonOutput filename)
list(APPEND BISON_TARGET_cmdopt "--verbose")
list(APPEND BISON_TARGET_extraoutputs
"${BISON_TARGET_verbose_file}")
if (NOT "${filename}" STREQUAL "")
add_custom_command(OUTPUT ${filename}
COMMAND ${CMAKE_COMMAND} -E copy
"${BISON_TARGET_verbose_file}"
"${filename}"
VERBATIM
DEPENDS
"${BISON_TARGET_verbose_file}"
COMMENT "[BISON][${Name}] Copying bison verbose table to ${filename}"
WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
set(BISON_${Name}_VERBOSE_FILE ${filename})
list(APPEND BISON_TARGET_extraoutputs
"${filename}")
endif()
endmacro()
#============================================================
# BISON_TARGET (public macro)
#============================================================
#
macro(BISON_TARGET Name BisonInput BisonOutput)
set(BISON_TARGET_outputs "${BisonOutput}")
set(BISON_TARGET_extraoutputs "")
# Parsing parameters
set(BISON_TARGET_PARAM_OPTIONS
)
set(BISON_TARGET_PARAM_ONE_VALUE_KEYWORDS
COMPILE_FLAGS
DEFINES_FILE
REPORT_FILE
)
set(BISON_TARGET_PARAM_MULTI_VALUE_KEYWORDS
VERBOSE
)
cmake_parse_arguments(
BISON_TARGET_ARG
"${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")
elseif("${BISON_TARGET_ARG_VERBOSE}" MATCHES ";")
# [VERBOSE [<file>] hack: <file> is non-multi value by usage
message(SEND_ERROR "Usage")
else()
BISON_TARGET_option_extraopts("${BISON_TARGET_ARG_COMPILE_FLAGS}")
BISON_TARGET_option_defines("${BisonOutput}" "${BISON_TARGET_ARG_DEFINES_FILE}")
BISON_TARGET_option_report_file("${BisonOutput}" "${BISON_TARGET_ARG_REPORT_FILE}")
if(NOT "${BISON_TARGET_ARG_VERBOSE}" STREQUAL "")
BISON_TARGET_option_verbose(${Name} ${BisonOutput} "${BISON_TARGET_ARG_VERBOSE}")
else()
# [VERBOSE [<file>]] is used with no argument or is not used
set(BISON_TARGET_args "${ARGN}")
list(FIND BISON_TARGET_args "VERBOSE" BISON_TARGET_args_indexof_verbose)
if(${BISON_TARGET_args_indexof_verbose} GREATER -1)
# VERBOSE is used without <file>
BISON_TARGET_option_verbose(${Name} ${BisonOutput} "")
endif()
endif()
list(APPEND BISON_TARGET_outputs "${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} ${BISON_TARGET_extraoutputs})
set(BISON_${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)
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