From 876f70f63ee419d02101e181d616c25993268906 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 29 Aug 2014 18:43:53 -0400
Subject: lib/deps.sh: New file

---
diff --git a/lib/deps.sh b/lib/deps.sh
new file mode 100644
index 0000000..7800cad
--- /dev/null
+++ b/lib/deps.sh
@@ -0,0 +1,161 @@
+# Functions for parsing dependency field values
+#
+# Copyright (C) 2012, 2014  Patrick "P. J." McDermott
+#
+# This file is part of the ProteanOS Development Kit.
+#
+# The ProteanOS Development Kit 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.
+#
+# The ProteanOS Development Kit 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 the ProteanOS Development Kit.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+[ "x${_DEPS_SM+set}" = 'xset' ] && return 0
+_DEPS_SM=1
+
+use archplat
+
+parse_dep()
+{
+	local dep="${1}"
+	local host_arch="${2}"
+	local host_plat="${3}"
+	local pkgarchqual=
+	local pkg=
+	local archqual=
+	local relver=
+	local rel=
+	local ver=
+	local arches=
+	local plats=
+
+	dep="$(printf '%s\n' "${dep}" | sed -n '
+		H;                        # Store each input line in hold space.
+		${                        # On the last line:
+		  g;                      # Restore everything to pattern space.
+		  s/[\t\n]/ /g;           # Replace tabs & newlines with spaces.
+		  s/ *\([(\[<]\) */ \1/g; # One space before "(", "[", and "<".
+		  s/ *\([)\]>]\) */\1 /g; # One space after "(", "[", and "<".
+		  s/ *\(<[<=]\) */\1 /g;  # One space after "<<" and "<=".
+		  s/ *\(>[>=]\) */\1 /g;  # One space after ">>" and ">=".
+		  s/ *\(=\) */\1 /g;      # One space after "=".
+		  s/^ *//;                # Remove leading spaces.
+		  s/ *$//;                # Remove trailing spaces.
+		  s/  */ /g;              # Remove duplicate spaces.
+		  p;                      # Print the pattern space.
+		};                        # End.
+		')"
+
+	# dep is now of the form:
+	# pkg[:archqual] [(rel ver)] [\[arches\]] [<plats>]
+
+	pkgarchqual="${dep%% *}"
+	dep=" ${dep#* }"
+	pkg="${pkgarchqual%:*}"
+	if [ "x${pkg}" != "x${pkgarchqual}" ]; then
+		archqual="${pkgarchqual##*:}"
+	fi
+
+	if [ "x${dep# (*)}" != "x${dep}" ]; then
+		relver="${dep# (}"
+		relver="${relver%%)*}"
+		dep="${dep# (*)}"
+		rel="${relver% *}"
+		ver="${relver##* }"
+	fi
+
+	if [ "x${dep# \[*\]}" != "x${dep}" ]; then
+		arches="${dep# \[}"
+		arches="${arches%%\]*}"
+		dep="${dep# \[*\]}"
+	fi
+
+	if [ "x${dep# <*>}" != "x${dep}" ]; then
+		plats="${dep# <}"
+		plats="${plats%%>*}"
+		dep="${dep# <*>}"
+	fi
+
+	if [ "x${host_arch}" != 'x' ] && ! arch_is_concerned \
+			"${host_arch}" "${arches}"; then
+		return 0
+	fi
+	if [ "x${host_plat}" != 'x' ] && ! plat_is_concerned \
+			"${host_plat}" "${plats}"; then
+		return 0
+	fi
+
+	printf '%s' "${pkg}"
+	[ "x${archqual}" != 'x' ] && printf ':%s' "${archqual}"
+	[ "x${ver}" != 'x' ] && printf ' (%s %s)' "${rel}" "${ver}"
+	[ "x${host_arch}" = 'x' ] && [ "x${arches}" != 'x' ] && \
+		printf ' [%s]' "${arches}"
+	[ "x${host_plat}" = 'x' ] && [ "x${plats}" != 'x' ] && \
+		printf ' <%s>' "${plats}"
+	printf '\n'
+
+	return 0
+}
+
+reduce_deps()
+{
+	local deps="${1}"
+	local union="${2}"
+	local host_arch="${3}"
+	local host_plat="${4}"
+	local dep_and=
+	local dep_or=
+	local dep_list=
+	local dep_or_list=
+	local dep=
+
+	dep_list=''
+	IFS=','
+	for dep_and in ${deps}; do
+		unset IFS
+		if ! ${union}; then
+			dep_or_list=''
+			IFS='|'
+			for dep_or in ${dep_and}; do
+				unset IFS
+				dep="$(parse_dep "${dep_or}" \
+					"${host_arch}" "${host_plat}")"
+				if [ "x${dep}" != 'x' ]; then
+					if [ "x${dep_or_list}" != 'x' ]; then
+						dep_or_list="${dep_or_list} | "
+					fi
+					dep_or_list="${dep_or_list}${dep}"
+				fi
+			done
+			unset IFS
+			if [ "x${dep_or_list}" != 'x' ]; then
+				if [ "x${dep_list}" != 'x' ]; then
+					dep_list="${dep_list}, "
+				fi
+				dep_list="${dep_list}${dep_or_list}"
+			fi
+		else
+			dep="$(parse_dep "${dep_and}" \
+				"${host_arch}" "${host_plat}")"
+			if [ "x${dep}" != 'x' ]; then
+				if [ "x${dep_list}" != 'x' ]; then
+					dep_list="${dep_list}, "
+				fi
+				dep_list="${dep_list}${dep}"
+			fi
+		fi
+	done
+	unset IFS
+
+	printf '%s\n' "${dep_list}"
+
+	return 0
+}
diff --git a/lib/local.mk b/lib/local.mk
index b8ae0b9..b1076f2 100644
--- a/lib/local.mk
+++ b/lib/local.mk
@@ -4,6 +4,7 @@ pkgdata_sources = \
 	lib/getopt.sh \
 	lib/fd.sh \
 	lib/archplat.sh \
+	lib/deps.sh \
 	lib/control.sh \
 	lib/feed.sh \
 	lib/pkg.sh \
--
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