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# - Parse the arguments in ARGS.
# This module provides the following macro:
# PROCESS_ARGUMENTS (ARGS NAMES NEED WANT MORE SKIP [PREFIX])
#
# ARGS - the list of arguments
# NAMES - a list of accepted option names, in order
# NEED - a list of boolean values specifying whether the corresponding
# options are required
# WANT - a list of integer values specifying how many arguments
# the corresponding options require
# MORE - a list of boolean values specifying whether the corresponding
# options accept more arguments than they want
# SKIP - a list of integer values for skipping control
# PREFIX - output variables prefix, "_" by default
#
# If an option is present, ${PREFIX}${lower cased name of the option}
# will be set to TRUE. If it's got any parameters, they will be stored
# in ${PREFIX}${lower case name of the option}_param.
#
# All the lists are indirect and the arguments to this macro
# specify names of the lists within the current scope.
#
#=============================================================================
# Copyright 2010 Přemysl Eric Janouch
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * 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.
#
# 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 HOLDERS 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.
#=============================================================================
macro (PROCESS_ARGUMENTS ARGS NAMES NEED WANT MORE SKIP)
# Get the prefix
if ("${ARGN}" STREQUAL "")
set (__pa_prefix "_")
else ("${ARGN}" STREQUAL "")
set (__pa_value ${ARGN})
list (GET __pa_value 0 __pa_prefix)
endif ("${ARGN}" STREQUAL "")
# By default, no parameters have been read
foreach (__pa_value ${${NAMES}})
string (TOLOWER ${__pa_value} __pa_value)
set (${__pa_prefix}${__pa_value} FALSE)
set (${__pa_prefix}${__pa_value}_param)
endforeach (__pa_value)
# Find the first required option or -1
list (FIND ${NEED} "YES" __pa_need)
# Currently processed option
set (__pa_cur "")
# Index of the option
set (__pa_cur_index -1)
# In lowercase, prefixed with an underscore
set (__pa_cur_base "")
# How many arguments we want for this option
set (__pa_want 0)
# Do we accept additional arguments?
set (__pa_more FALSE)
# The next expected index minus one
set (__pa_cur_nextmm -1)
foreach (__pa_arg ${${ARGS}})
list (FIND ${NAMES} ${__pa_arg} __pa_found)
# Found an option name
if (${__pa_found} GREATER ${__pa_cur_nextmm})
# Missing arguments
if (${__pa_want} GREATER 0)
message (FATAL_ERROR "Argument(s) required for ${__pa_cur}")
# Missing option
elseif (${__pa_need} GREATER -1
AND ${__pa_found} GREATER ${__pa_need})
list (GET ${NAMES} ${__pa_need} __pa_value)
message (FATAL_ERROR "Option ${__pa_value} needed")
endif (${__pa_want} GREATER 0)
set (__pa_cur ${__pa_arg})
set (__pa_cur_index ${__pa_found})
string (TOLOWER ${__pa_arg} __pa_value)
set (__pa_cur_base "${__pa_prefix}${__pa_value}")
list (GET ${WANT} ${__pa_found} __pa_want)
list (GET ${MORE} ${__pa_found} __pa_more)
# Skipping control
list (GET ${SKIP} ${__pa_found} __pa_value)
math (EXPR __pa_cur_nextmm "${__pa_found} + ${__pa_value}")
# Option found
set (${__pa_cur_base} TRUE)
# Since we read it, it's not needed anymore
if (${__pa_found} EQUAL ${__pa_need})
list (INSERT ${NEED} ${__pa_need} "NO")
math (EXPR __pa_value "${__pa_need} + 1")
list (REMOVE_AT ${NEED} ${__pa_value})
list (FIND ${NEED} "YES" __pa_need)
endif (${__pa_found} EQUAL ${__pa_need})
# Storing the required parameters for the current option
elseif (${__pa_want} GREATER 0)
list (APPEND ${__pa_cur_base}_param ${__pa_arg})
math (EXPR __pa_want "${__pa_want} - 1")
# Storing optional parameters for the current option
elseif (__pa_more)
list (APPEND ${__pa_cur_base}_param ${__pa_arg})
else (${__pa_found} GREATER ${__pa_cur_nextmm})
message (FATAL_ERROR "Unexpected ${__pa_arg}")
endif (${__pa_found} GREATER ${__pa_cur_nextmm})
endforeach (__pa_arg ${${ARGS}})
# Missing arguments at the end of list
if (${__pa_want} GREATER 0)
message (FATAL_ERROR "Argument(s) required for ${__pa_cur}")
# Missing options at the end of list
elseif (${__pa_need} GREATER -1)
list (GET ${NAMES} ${__pa_need} __pa_value)
message (FATAL_ERROR "Option ${__pa_value} needed")
endif (${__pa_want} GREATER 0)
endmacro (PROCESS_ARGUMENTS)
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