lib/control.sh: New file, from pro-archman.

2 files changed, 137 insertions, 0 deletions

diff --git a/lib/control.sh b/lib/control.sh
new file mode 100644
index 0000000..51a7aef
--- /dev/null
+++ b/lib/control.sh
@@ -0,0 +1,136 @@
+# ProteanOS Development Kit
+# lib/control.sh
+# Functions for parsing control files.
+#
+# Copyright (C) 2012, 2013  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 2 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/>.
+
+[ "x${_CONTROL_SM+set}" = 'xset' ] && return 0
+_CONTROL_SM=1
+
+use output
+use locale
+
+control_file=
+control_line_nr=
+
+parse_control()
+{
+	local field_cb="${2}"
+	local req_fields="${3}"
+	local opt_fields="${4}"
+	local all_fields=
+	local got_fields=
+	local line=
+	local name=
+	local value=
+
+	control_file="${1}"
+	control_line_nr=0
+
+	req_fields="$(printf '%s\n' ${req_fields})"
+	opt_fields="$(printf '%s\n' ${opt_fields})"
+	all_fields="${LF}${req_fields}${LF}${opt_fields}${LF}"
+	got_fields="${LF}"
+
+	while IFS='' read -r line; do
+		control_line_nr=$(($control_line_nr + 1))
+		if [ "x$(echo ${line})" = 'x' ]; then
+			parse_control_error 'control_empty_line'
+		elif [ "x${line#\#}" != "x${line}" ]; then
+			# Comment.
+			:
+		elif [ "x${line# }" = "x${line}" ]; then
+			# "Name: Value" line.
+			if [ "x${name}" != 'x' ]; then
+				if ! "${field_cb}" "${name}" "${value}"; then
+					return 0
+				fi
+			fi
+			name="${line%%:*}"
+			value="${line#*:}"
+			value="${value# }"
+			if [ "x${name}" = 'x' -o "x${name}" = "x${line}" ]; then
+				parse_control_error 'control_bad_nv'
+				continue
+			fi
+			if [ "x${req_fields}" != 'x' ]; then
+				if [ "x${all_fields%${LF}${name}${LF}*}" = \
+						"x${all_fields}" ]; then
+					# Unknown field.
+					parse_control_error \
+						'control_unknown_field' \
+						"${name}"
+				else
+					# Remove field from list of required
+					# fields.
+					req_fields="$(printf '%s' \
+						"${req_fields}" | \
+						grep -Fv "${name}")"
+				fi
+			fi
+			if [ "x${got_fields%${LF}${name}${LF}*}" != \
+					"x${got_fields}" ]; then
+				# Duplicate field.
+				parse_control_error 'control_duplicate_field' \
+					"${name}"
+			else
+				got_fields="${got_fields}${name}${LF}"
+			fi
+		else
+			# Continuation line.
+			if [ "x${name}" = 'x' ]; then
+				# Expecting a "Name: Value" line.
+				parse_control_error 'control_found_continuation'
+				continue
+			fi
+			value="${value}${LF}${line# }"
+		fi
+	done <<-EOF
+		$(cat "${control_file}")
+		EOF
+
+	if [ "x${name}" != 'x' ]; then
+		if ! "${field_cb}" "${name}" "${value}"; then
+			return 0
+		fi
+	fi
+
+	if [ "x${req_fields}" != 'x' ]; then
+		req_fields="$(printf "%s$(get_msg 'list_item_separator')" \
+			${req_fields})"
+		parse_control_error 'control_missing_fields' "${req_fields}"
+	fi
+
+	return 0
+}
+
+parse_control_error()
+{
+	local msgid="${1}"
+	local file_info=
+	shift 1
+
+	if [ ${control_line_nr} -eq 0 ]; then
+		file_info="$(printf '%20s:' "${control_file}")"
+	else
+		file_info="$(printf '%20s(l%d):' "${control_file}" \
+			"${control_line_nr}")"
+	fi
+
+	warn "${file_info} $(get_msg "${msgid}")" "${@}"
+
+	return 0
+}
diff --git a/lib/local.mk b/lib/local.mk
index 2525d10..c12d2ce 100644
--- a/lib/local.mk
+++ b/lib/local.mk
@@ -3,4 +3,5 @@ pkgdata_sources = \
 	lib/locale.sh \
 	lib/getopt.sh \
 	lib/fd.sh \
+	lib/control.sh \
 	lib/cmd.sh