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# - Find Ragel executable and provides macros to generate custom build rules
# The module defines the following variables:
#
# RAGEL_EXECUTABLE - path to the ragel program
# RAGEL_VERSION - version of ragel
# RAGEL_FOUND - true if the program was found
#
# If ragel is found, the module defines the macros:
#
# RAGEL_TARGET(<Name> INPUTS <inputs> OUTPUT <output>
# [COMPILE_FLAGS <string>] [DEPENDS <depends>])
#
# which will create a custom rule to generate a state machine. <RagelInp> is
# the path to a Ragel file. <CodeOutput> is the name of the source file
# generated by ragel. If COMPILE_FLAGS option is specified, the next
# parameter is added in the ragel command line.
#
# The macro defines a set of variables:
# RAGEL_${Name}_DEFINED - true is the macro ran successfully
# RAGEL_${Name}_INPUT - The input source file, an alias for <RagelInp>
# RAGEL_${Name}_OUTPUT_SOURCE - The source file generated by ragel
# RAGEL_${Name}_OUTPUT_HEADER - The header file generated by ragel
# RAGEL_${Name}_OUTPUTS - The sources files generated by ragel
# RAGEL_${Name}_COMPILE_FLAGS - Options used in the ragel command line
#
# ====================================================================
# Example:
#
# find_package(RAGEL) # or e.g.: find_package(RAGEL 6.6 REQUIRED)
# RAGEL_TARGET(MyMachine machine.rl ${CMAKE_CURRENT_BINARY_DIR}/machine.cc)
# add_executable(Foo main.cc ${RAGEL_MyMachine_OUTPUTS})
# ====================================================================
# 2014-02-09, Georg Sauthoff <mail@georg.so>
#
# I don't think that these few lines are even copyrightable material,
# but I am fine with using the BSD/MIT/GPL license on it ...
#
# I've used following references:
# http://www.cmake.org/cmake/help/v2.8.12/cmake.html
# /usr/share/cmake/Modules/FindFLEX.cmake
# /usr/share/cmake/Modules/FindBISON.cmake
find_program(RAGEL_EXECUTABLE NAMES ragel DOC "path to the ragel executable")
mark_as_advanced(RAGEL_EXECUTABLE)
if(RAGEL_EXECUTABLE)
execute_process(COMMAND ${RAGEL_EXECUTABLE} --version
OUTPUT_VARIABLE RAGEL_version_output
ERROR_VARIABLE RAGEL_version_error
RESULT_VARIABLE RAGEL_version_result
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(${RAGEL_version_result} EQUAL 0)
string(REGEX REPLACE "^Ragel State Machine Compiler version ([^ ]+) .*$"
"\\1"
RAGEL_VERSION "${RAGEL_version_output}")
else()
message(SEND_ERROR
"Command \"${RAGEL_EXECUTABLE} --version\" failed with output:
${RAGEL_version_error}")
endif()
#============================================================
# RAGEL_TARGET (public macro)
#============================================================
#
macro(RAGEL_TARGET Name)
CMAKE_PARSE_ARGUMENTS(RAGEL "" "OUTPUT"
"INPUTS;DEPENDS;COMPILE_FLAGS" ${ARGN})
file(RELATIVE_PATH RAGEL_OUTPUT_RELATIVE "${CMAKE_CURRENT_BINARY_DIR}"
"${RAGEL_OUTPUT}")
file(RELATIVE_PATH RAGEL_INPUTS_RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}"
"${RAGEL_INPUTS}")
add_custom_command(OUTPUT ${RAGEL_OUTPUT}
COMMAND ${RAGEL_EXECUTABLE}
ARGS ${RAGEL_COMPILE_FLAGS}
-o${RAGEL_OUTPUT} ${RAGEL_INPUTS}
DEPENDS ${RAGEL_INPUTS} ${RAGEL_DEPENDS}
COMMENT
"[RAGEL][${Name}] Compiling state machine with Ragel ${RAGEL_VERSION} -> ${RAGEL_OUTPUT}"
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
get_filename_component(src_target ${RAGEL_INPUTS} NAME_WE)
add_custom_target(ragel_${src_target} DEPENDS ${RAGEL_OUTPUT})
set_source_files_properties(${RAGEL_OUTPUT} PROPERTIES GENERATED TRUE)
set(RAGEL_${Name}_DEFINED TRUE)
set(RAGEL_${Name}_OUTPUTS ${RAGEL_OUTPUT})
set(RAGEL_${Name}_INPUT ${RAGEL_INPUTS})
set(RAGEL_${Name}_COMPILE_FLAGS ${RAGEL_COMPILE_FLAGS})
endmacro()
endif()
# use this include when module file is located under /usr/share/cmake/Modules
#include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
# use this include when module file is located in build tree
include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(RAGEL REQUIRED_VARS RAGEL_EXECUTABLE
VERSION_VAR RAGEL_VERSION)
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