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# 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
}
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