# opkbuild
# lib/deps
# Functions for parsing dependency field values.
#
# Copyright (C) 2012 Patrick "P. J." McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

[ -n "${_OB_DEPS_SM}" ] && return 0
_OB_DEPS_SM='true'

ob_parse_dep()
{
	_ob_local _obpd_opt _obpd_pkg_var _obpd_archqual_var _obpd_rel_var \
		_obpd_ver_var _obpd_arches_var _obpd_host_arch _obpd_dep \
		_obpd_pkgarchqual _obpd_pkg _obpd_archqual \
		_obpd_relver _obpd_rel _obpd_ver _obpd_arches \
		_obpd_comp _obpd_comp_var

	while getopts 'p:q:r:v:A:a:' _obpd_opt; do
		case "${_obpd_opt}" in
			p)
				_obpd_pkg_var="${OPTARG}"
				;;
			q)
				_obpd_archqual_var="${OPTARG}"
				;;
			r)
				_obpd_rel_var="${OPTARG}"
				;;
			v)
				_obpd_ver_var="${OPTARG}"
				;;
			A)
				_obpd_arches_var="${OPTARG}"
				;;
			a)
				_obpd_host_arch="${OPTARG}"
				;;
			?)
				_ob_return 125
				return ${?}
				;;
		esac
	done
	shift $(($OPTIND - 1))

	if [ "${#}" -eq 1 ]; then
		# Separate components with spaces.
		_obpd_dep="$(echo "${1}" | \
			sed 's/\([(\[]\)/ \1/g;s/\([<>=][<>=]*\)/\1 /g')"
		# Remove leading, trailing, and duplicate spaces.
		_obpd_dep="$(echo "${_obpd_dep}" | \
			sed 's/\t/ /g;s/^ *//;s/ *$//;s/  */ /g') "
	else
		_ob_return 125
		return ${?}
	fi

	# <pkg>[:<archqual>] [(<rel> <ver>)] [\[<arches>\]]

	_obpd_pkgarchqual="${_obpd_dep%% *}"
	_obpd_dep=" ${_obpd_dep#* }"
	_obpd_pkg="${_obpd_pkgarchqual%:*}"
	if [ "${_obpd_pkg}" != "${_obpd_pkgarchqual}" ]; then
		_obpd_archqual="${_obpd_pkgarchqual##*:}"
	fi

	if [ "${_obpd_dep# (*)}" != "${_obpd_dep}" ]; then
		_obpd_relver="${_obpd_dep# (}"
		_obpd_relver="${_obpd_relver%%)*}"
		_obpd_dep="${_obpd_dep# (*)}"
		_obpd_rel="${_obpd_relver% *}"
		_obpd_ver="${_obpd_relver##* }"
	fi

	if [ "${_obpd_dep# \[*\]}" != "${_obpd_dep}" ]; then
		_obpd_arches="${_obpd_dep# \[}"
		_obpd_arches="${_obpd_arches%%\]*}"
	fi

	# Set the specified variables.
	for _obpd_comp in pkg archqual rel ver arches; do
		_obpd_comp_var="$(eval echo \"\$\{_obpd_${_obpd_comp}_var\}\")"
		[ -z "${_obpd_comp_var}" ] && continue
		eval ${_obpd_comp_var}=\"\$\{_obpd_${_obpd_comp}\}\"
	done

	if [ -z "${_obpd_host_arch}" ]; then
		printf '%s' "${_obpd_pkg}"
		[ -n "${_obpd_archqual}" ] && printf ':%s' "${_obpd_archqual}"
		[ -n "${_obpd_ver}" ] && printf ' (%s %s)' "${_obpd_rel}" "${_obpd_ver}"
		[ -n "${_obpd_arches}" ] && printf ' [%s]' "${_obpd_arches}"
		printf '\n'
	elif _ob_dep_arch_is_concerned "${_obpd_host_arch}" "${_obpd_arches}"; then
		printf '%s' "${_obpd_pkg}"
		[ -n "${_obpd_archqual}" ] && printf ':%s' "${_obpd_archqual}"
		[ -n "${_obpd_ver}" ] && printf ' (%s %s)' "${_obpd_rel}" "${_obpd_ver}"
		printf '\n'
	fi

	_ob_return 0
	return ${?}
}

ob_reduce_deps()
{
	_ob_local _obrd_opt _obrd_host_arch _obrd_deps \
		_obrd_orig_ifs _obrd_dep_and _obrd_dep_or \
		_obrd_dep_list _obrd_dep_or_list _obrd_dep

	_obrd_union='false'

	while getopts 'a:u' _obrd_opt; do
		case "${_obrd_opt}" in
			a)
				_obrd_host_arch="${OPTARG}"
				;;
			u)
				_obrd_union='true'
				;;
			?)
				_ob_return 125
				return ${?}
				;;
		esac
	done
	shift $(($OPTIND - 1))

	if [ ${#} -eq 1 ]; then
		_obrd_deps="${1}"
	else
		_ob_return 125
		return ${?}
	fi

	_obrd_orig_ifs="${IFS}"
	IFS=','
	for _obrd_dep_and in ${_obrd_deps}; do
		IFS="${_obrd_orig_ifs}"
		if ! ${_obrd_union}; then
			IFS='|'
			_obrd_dep_or_list=
			for _obrd_dep_or in ${_obrd_dep_and}; do
				IFS="${_obrd_orig_ifs}"
				_obrd_dep="$(ob_parse_dep -a "${_obrd_host_arch}" \
					"${_obrd_dep_or}")"
				if [ -n "${_obrd_dep}" ]; then
					if [ -n "${_obrd_dep_or_list}" ]; then
						_obrd_dep_or_list="${_obrd_dep_or_list} | "
					fi
					_obrd_dep_or_list="${_obrd_dep_or_list}${_obrd_dep}"
				fi
			done
			if [ -n "${_obrd_dep_or_list}" ]; then
				if [ -n "${_obrd_dep_list}" ]; then
					_obrd_dep_list="${_obrd_dep_list}, "
				fi
				_obrd_dep_list="${_obrd_dep_list}${_obrd_dep_or_list}"
			fi
		else
			_obrd_dep="$(ob_parse_dep -a "${_obrd_host_arch}" \
				"${_obrd_dep_and}")"
			if [ -n "${_obrd_dep}" ]; then
				if [ -n "${_obrd_dep_list}" ]; then
					_obrd_dep_list="${_obrd_dep_list}, "
				fi
				_obrd_dep_list="${_obrd_dep_list}${_obrd_dep}"
			fi
		fi
	done

	echo "${_obrd_dep_list}"

	_ob_return 0
	return ${?}
}

_ob_dep_arch_is_concerned()
{
	_ob_local _obdaic_host_arch _obdaic_arches \
		_obdaic_arch _obdaic_not_arch _obdaic_seen_arch

	_obdaic_host_arch="${1}"
	_obdaic_arches="${2}"
	_obdaic_seen_arch=1

	if [ -z "${_obdaic_arches}" ]; then
		_obdaic_seen_arch=0
	fi

	for _obdaic_arch in ${_obdaic_arches}; do
		_obdaic_not_arch="${_obdaic_arch#!}"
		if [ "${_obdaic_not_arch}" != "${_obdaic_arch}" ]; then
			if ob_match_arch "${_obdaic_host_arch}" "${_obdaic_not_arch}"; then
				_obdaic_seen_arch=1
				break
			else
				_obdaic_seen_arch=0
			fi
		elif ob_match_arch "${_obdaic_host_arch}" "${_obdaic_arch}"; then
			_obdaic_seen_arch=0
			break
		fi
	done

	_ob_return ${_obdaic_seen_arch}
	return ${?}
}