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# - Look for GNU Bison, the parser generator
# Based off a news post from Andy Cedilnik at Kitware
# Defines the following:
# BISON_EXECUTABLE - path to the bison executable
# BISON_FILE - parse a file with bison
# BISON_PREFIX_OUTPUTS - Set to true to make BISON_FILE produce prefixed
# symbols in the generated output based on filename.
# So for ${filename}.y, you'll get ${filename}parse(), etc.
# instead of yyparse().
# BISON_GENERATE_DEFINES - Set to true to make BISON_FILE output the matching
# .h file for a .c file. You want this if you're using
# flex.
IF(NOT DEFINED BISON_PREFIX_OUTPUTS)
SET(BISON_PREFIX_OUTPUTS FALSE)
ENDIF(NOT DEFINED BISON_PREFIX_OUTPUTS)
IF(NOT DEFINED BISON_GENERATE_DEFINES)
SET(BISON_GENERATE_DEFINES FALSE)
ENDIF(NOT DEFINED BISON_GENERATE_DEFINES)
IF(NOT BISON_EXECUTABLE)
MESSAGE(STATUS "Looking for bison")
FIND_PROGRAM(BISON_EXECUTABLE bison)
IF(BISON_EXECUTABLE)
MESSAGE(STATUS "Looking for bison -- ${BISON_EXECUTABLE}")
ENDIF(BISON_EXECUTABLE)
ENDIF(NOT BISON_EXECUTABLE)
IF(BISON_EXECUTABLE)
MACRO(BISON_FILE FILENAME)
GET_FILENAME_COMPONENT(PATH "${FILENAME}" PATH)
IF("${PATH}" STREQUAL "")
SET(PATH_OPT "")
ELSE("${PATH}" STREQUAL "")
SET(PATH_OPT "/${PATH}")
ENDIF("${PATH}" STREQUAL "")
GET_FILENAME_COMPONENT(HEAD "${FILENAME}" NAME_WE)
IF(NOT EXISTS "${CMAKE_CURRENT_BINARY_DIR}${PATH_OPT}")
FILE(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}${PATH_OPT}")
ENDIF(NOT EXISTS "${CMAKE_CURRENT_BINARY_DIR}${PATH_OPT}")
GET_FILENAME_COMPONENT(EXT "${FILENAME}" EXT)
STRING(REGEX REPLACE "y" "c" EXT "${EXT}")
STRING(REGEX REPLACE "c" "h" HEXT "${EXT}")
IF(BISON_PREFIX_OUTPUTS)
SET(PREFIX "${HEAD}")
ELSE(BISON_PREFIX_OUTPUTS)
SET(PREFIX "yy")
ENDIF(BISON_PREFIX_OUTPUTS)
SET(OUTFILE "${CMAKE_CURRENT_BINARY_DIR}${PATH_OPT}/${HEAD}.tab${EXT}")
IF(BISON_GENERATE_DEFINES)
SET(HEADER "${CMAKE_CURRENT_BINARY_DIR}${PATH_OPT}/${HEAD}.tab${HEXT}")
ADD_CUSTOM_COMMAND(
OUTPUT "${OUTFILE}" "${HEADER}"
COMMAND "${BISON_EXECUTABLE}"
ARGS "--name-prefix=${PREFIX}"
"--defines"
"--output-file=${OUTFILE}"
"${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}"
DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}")
SET_SOURCE_FILES_PROPERTIES("${OUTFILE}" "${HEADER}" PROPERTIES GENERATED TRUE)
SET_SOURCE_FILES_PROPERTIES("${HEADER}" PROPERTIES HEADER_FILE_ONLY TRUE)
ELSE(BISON_GENERATE_DEFINES)
ADD_CUSTOM_COMMAND(
OUTPUT "${OUTFILE}"
COMMAND "${BISON_EXECUTABLE}"
ARGS "--name-prefix=${PREFIX}"
"--output-file=${OUTFILE}"
"${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}"
DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}")
SET_SOURCE_FILES_PROPERTIES("${OUTFILE}" PROPERTIES GENERATED TRUE)
ENDIF(BISON_GENERATE_DEFINES)
ENDMACRO(BISON_FILE)
ENDIF(BISON_EXECUTABLE)
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