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# Functions for parsing control files.
#
# Copyright (C) 2012, 2013, 2019 Patrick 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/>.
_parse_control_error()
{
local file="${1}"
local line_nr="${2}"
local msg_id="${3}"
shift 3
local file_info=
if [ ${line_nr} -eq 0 ]; then
file_info="$(printf '%s' "${file}")"
else
file_info="$(printf '%s:%d' "${file}" "${line_nr}")"
fi
warn "${file_info}: $(get_msg "${msg_id}")" "${@}"
return 0
}
parse_control()
{
local file="${1}"
local field_cb="${2}"
local paragraph_cb="${3}"
shift 3
local req_fields=
local line_nr=
local in_paragraph=
local line=
local para_req_fields=
local got_fields=
local name=
local value=
if [ ${#} -eq 1 ]; then
req_fields=" ${1} "
shift 1
fi
line_nr=0
in_paragraph='false'
while IFS='' read -r line; do
line_nr=$((${line_nr} + 1))
case "${line}" in
'')
# Paragraph end.
if ${in_paragraph}; then
# The first line is blank to consolidate
# initialization code (see heredocument
# below).
in_paragraph='false'
if [ -n "${name}" ]; then
if ! "${field_cb}" "${name}" \
"${value}"; then
return 0
fi
fi
if ! "${paragraph_cb}"; then
return 0
fi
case "${para_req_fields}" in *[!\ ]*)
# Missing required control
# fields.
sep="$(get_msg \
'list_item_separator')"
para_req_fields="$(printf \
"%s${sep}" \
${para_req_fields}; \
printf 'x')"
para_req_fields="$(: \
)${para_req_fields%$(: \
)${sep}x}"
_parse_control_error \
"${file}" "${line_nr}" \
'control_missing_fields'\
"${para_req_fields}"
esac
fi
para_req_fields="${req_fields}"
got_fields=' '
name=''
value=''
;;
'#'*) # Comment.
in_paragraph='true'
;;
[!\ ]*':'*) # "Name: Value" line.
in_paragraph='true'
if [ -n "${name}" ]; then
if ! "${field_cb}" "${name}" "${value}"
then
return 0
fi
fi
IFS=': ' read name value <<-EOF
${line}
EOF
if [ -z "${name}" ]; then
_parse_control_error "${file}" \
"${line_nr}" 'control_bad_nv'
continue
fi
case "${got_fields}" in *" ${name} "*)
# Duplicate field.
_ob_parse_control_error \
"${file}" "${line_nr}" \
'control_duplicate_field' \
"${name}"
continue
esac
got_fields="${got_fields}${name} "
case "${para_req_fields}" in *" ${name} "*)
# Required field: remove from list.
para_req_fields="$(:\
)${para_req_fields% ${name} *}$(
:\
) ${para_req_fields#* ${name} }"
continue
esac
;;
' '*) # Continuation line.
in_paragraph='true'
if [ -z "${name}" ]; then
# Expecting a "Name: Value" line.
_parse_control_error "${file}" \
"${line_nr}" \
'control_found_continuation'
continue
fi
value="${value}${LF}${line# }"
;;
esac
done <<-EOF
$(cat -- "${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.
return 0
}
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