############################################################################
#
# Copyright (c) 2015 PX4 Development Team. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name PX4 nor the names of its contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################

# cmake include guard
if(px4_parse_function_args_included)
	return()
endif(px4_parse_function_args_included)
set(px4_parse_function_args_included true)

#=============================================================================
#
#	px4_parse_function_args
#
#	This function simplifies usage of the cmake_parse_arguments module.
#	It is intended to be called by other functions.
#
#	Usage:
#		px4_parse_function_args(
#			NAME <name>
#			[ OPTIONS <list> ]
#			[ ONE_VALUE <list> ]
#			[ MULTI_VALUE <list> ]
#			REQUIRED <list>
#			ARGN <ARGN>)
#
#	Input:
#		NAME		: the name of the calling function
#		OPTIONS		: boolean flags
#		ONE_VALUE	: single value variables
#		MULTI_VALUE	: multi value variables
#		REQUIRED	: required arguments
#		ARGN		: the function input arguments, typically ${ARGN}
#
#	Output:
#		The function arguments corresponding to the following are set:
#		${OPTIONS}, ${ONE_VALUE}, ${MULTI_VALUE}
#
#	Example:
#		function test()
#			px4_parse_function_args(
#				NAME TEST
#				ONE_VALUE NAME
#				MULTI_VALUE LIST
#				REQUIRED NAME LIST
#				ARGN ${ARGN})
#			message(STATUS "name: ${NAME}")
#			message(STATUS "list: ${LIST}")
#		endfunction()
#
#		test(NAME "hello" LIST a b c)
#
#		OUTPUT:
#			name: hello
#			list: a b c
#
include(CMakeParseArguments)
function(px4_parse_function_args)

	cmake_parse_arguments(IN "" "NAME" "OPTIONS;ONE_VALUE;MULTI_VALUE;REQUIRED;ARGN" "${ARGN}")
	cmake_parse_arguments(OUT "${IN_OPTIONS}" "${IN_ONE_VALUE}" "${IN_MULTI_VALUE}" "${IN_ARGN}")

	if(OUT_UNPARSED_ARGUMENTS)
		message(FATAL_ERROR "${IN_NAME}: unparsed ${OUT_UNPARSED_ARGUMENTS}")
	endif()

	foreach(arg ${IN_REQUIRED})
		if (NOT OUT_${arg})
			if (NOT "${OUT_${arg}}" STREQUAL "0")
				message(FATAL_ERROR "${IN_NAME} requires argument ${arg}\nARGN: ${IN_ARGN}")
			endif()
		endif()
	endforeach()

	foreach(arg ${IN_OPTIONS} ${IN_ONE_VALUE} ${IN_MULTI_VALUE})
		set(${arg} ${OUT_${arg}} PARENT_SCOPE)
	endforeach()

endfunction()