summaryrefslogtreecommitdiffstats
path: root/src/control.sh
blob: b25d00bfdd7cf21d50e98d35f0cc2151110c4025 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
# Functions for parsing control files.
#
# Copyright (C) 2012, 2013  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/>.

control_file=
control_line_nr=

parse_control()
{
	local field_cb="${2}"
	local paragraph_cb="${3}"
	local req_fields="${4}"
	local in_paragraph=
	local line=
	local para_req_fields=
	local got_fields=
	local name=
	local value=

	control_file="${1}"
	control_line_nr=0

	in_paragraph='false'

	while IFS='' read -r line; do
		control_line_nr=$(($control_line_nr + 1))
		if [ "x$(echo ${line})" = 'x' ]; then
			# Paragraph end.
			if ${in_paragraph}; then
				# The first line is blank to consolidate
				# initialization code (see heredocument below).
				in_paragraph='false'
				if [ "x${name}" != 'x' ]; then
					if ! "${field_cb}" "${name}" "${value}"
					then
						return 0
					fi
				fi
				if ! "${paragraph_cb}"; then
					return 0
				fi
				if [ "x${para_req_fields}" != 'x' ]; then
					para_req_fields="$(printf "%s$(get_msg \
						'list_item_separator')" \
						${para_req_fields})"
					parse_control_error \
						'control_missing_fields' \
						"${para_req_fields}"
				fi
			fi
			para_req_fields="$(printf '%s\n' ${req_fields})"
			got_fields="${LF}"
			name=''
			value=''
		elif [ "x${line#\#}" != "x${line}" ]; then
			# Comment.
			in_paragraph='true'
		elif [ "x${line# }" = "x${line}" ]; then
			# "Name: Value" line.
			in_paragraph='true'
			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${para_req_fields}" != 'x' ]; then
				# Remove field from list of required fields.
				para_req_fields="$(printf '%s' "${para_req_fields}" | \
					grep -Fv "${name}")"
			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}${LF}"
			fi
		else
			# Continuation line.
			in_paragraph='true'
			if [ "x${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
	# The first blank line above triggers the paragraph end code to
	# consolidate initialization code.
	# The second blank line above is needed because the command substitution
	# removes any trailing newlines.

	if [ "x${name}" != 'x' ]; then
		if ! "${field_cb}" "${name}" "${value}"; then
			return 0
		fi
	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
}