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# pro-archman
# src/control.sh
# Functions for parsing control files.
#
# Copyright (C) 2012, 2018, 2019 Patrick McDermott
#
# This file is part of the ProteanOS Archive Manager.
#
# The ProteanOS Archive Manager 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 Archive Manager 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 Archive Manager. If not, see
# <http://www.gnu.org/licenses/>.
_parse_control_error()
{
file="${1}"
line_nr="${2}"
msg_id="${3}"
shift 3
local file_info=
if [ ${line_nr} -eq 0 ]; then
file_info="$(printf '%s' "${file}")"
else
file_info="$(printf '%s(l%d)' "${file}" "${line_nr}")"
fi
warn "${file_info} $(get_msg "${msg_id}")" "${@}"
return 0
}
parse_control()
{
local file="${1}"
local field_cb="${2}"
local user_data="${3}"
shift 3
local check_fields=
local req_fields=
local opt_fields=
local got_fields=
local line_nr=
local line=
local name=
local value=
local sep=
check_fields='false'
if [ ${#} -eq 2 ]; then
req_fields=" ${1} "
opt_fields=" ${2} "
shift 2
check_fields='true'
fi
got_fields=' '
line_nr=0
while IFS='' read -r line; do
line_nr=$((${line_nr} + 1))
case "${line}" in
'')
_parse_control_error "${file}" "${line_nr}" \
'control_empty_line'
;;
'#'*) # Comment.
;;
[!\ ]*':'*) # "Name: Value" line.
if [ -n "${name}" ]; then
if ! "${field_cb}" "${name}" "${value}"\
"${user_data}"; then
return 0
fi
fi
IFS=': ' read name value <<-EOF
${line}
EOF
if [ -z "${name}" ]; then
# Badly formatted control field.
_parse_control_error "${file}" \
"${line_nr}" 'control_bad_nv'
continue
fi
case "${got_fields}" in *" ${name} "*)
# Duplicate field.
_parse_control_error \
"${file}" "${line_nr}" \
'control_duplicate_field' \
"${name}"
continue
esac
got_fields="${got_fields}${name} "
case "${req_fields}" in *" ${name} "*)
# Required field: remove from list.
req_fields="${req_fields% ${name} *}$(:\
) ${req_fields#* ${name} }"
continue
esac
if ${check_fields}; then
case "${opt_fields}" in *" ${name} "*)
# Optional field.
continue
esac
# Unknown field.
_parse_control_error \
"${file}" "${line_nr}" \
'control_unknown_field' \
"${name}"
fi
;;
' '*) # Continuation line.
if [ -z "${name}" ]; then
# Expecting a "Name: Value" line.
_parse_control_error "${file}" \
"${line_nr}" \
'control_found_continuation'
continue
fi
value="${value}${OB_LF}${line# }"
;;
esac
done <<-EOF
$(cat -- "${file}")
EOF
if [ -n "${name}" ]; then
if ! "${field_cb}" "${name}" "${value}" "${user_data}"; then
return 0
fi
fi
if ${check_fields}; then
case "${req_fields}" in *[!\ ]*)
# Missing required control fields.
sep="$(get_msg 'list_item_separator')"
req_fields="$(printf "%s${sep}" ${req_fields}; \
printf 'x')"
req_fields="${req_fields%${sep}x}"
_parse_control_error "${file}" '0' \
'control_missing_fields' "${req_fields}"
esac
fi
return 0
}
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