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# - Look for GNU flex, the lexer generator.
# Defines the following:
# FLEX_EXECUTABLE - path to the flex executable
# FLEX_FILE - parse a file with flex
# FLEX_PREFIX_OUTPUTS - Set to true to make FLEX_FILE produce outputs of
# lex.${filename}.c, not lex.yy.c . Passes -P to flex.
IF(NOT DEFINED FLEX_PREFIX_OUTPUTS)
SET(FLEX_PREFIX_OUTPUTS FALSE)
ENDIF(NOT DEFINED FLEX_PREFIX_OUTPUTS)
IF(NOT FLEX_EXECUTABLE)
MESSAGE(STATUS "Looking for flex")
FIND_PROGRAM(FLEX_EXECUTABLE flex)
IF(FLEX_EXECUTABLE)
MESSAGE(STATUS "Looking for flex -- ${FLEX_EXECUTABLE}")
ENDIF(FLEX_EXECUTABLE)
ENDIF(NOT FLEX_EXECUTABLE)
IF(FLEX_EXECUTABLE)
MACRO(FLEX_FILE FILENAME)
GET_FILENAME_COMPONENT(PATH "${FILENAME}" PATH)
IF("${PATH}" STREQUAL "")
SET(PATH_OPT "")
ELSE("${PATH}" STREQUAL "")
SET(PATH_OPT "/${PATH}")
ENDIF("${PATH}" STREQUAL "")
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 "${FILENAME}" EXT)
STRING(REGEX REPLACE "l" "c" EXT "${EXT}")
IF(FLEX_PREFIX_OUTPUTS)
GET_FILENAME_COMPONENT(PREFIX "${FILENAME}" NAME_WE)
ELSE(FLEX_PREFIX_OUTPUTS)
SET(PREFIX "yy")
ENDIF(FLEX_PREFIX_OUTPUTS)
SET(OUTFILE "${CMAKE_CURRENT_BINARY_DIR}${PATH_OPT}/lex.${PREFIX}${EXT}")
ADD_CUSTOM_COMMAND(
OUTPUT "${OUTFILE}"
COMMAND "${FLEX_EXECUTABLE}"
ARGS "-P${PREFIX}"
"-o${OUTFILE}"
"${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}"
DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}")
SET_SOURCE_FILES_PROPERTIES("${OUTFILE}" PROPERTIES GENERATED TRUE)
ENDMACRO(FLEX_FILE)
ENDIF(FLEX_EXECUTABLE)
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