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# opkbuild
# lib/control
# Functions for parsing control files.
#
# Copyright (C) 2012 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/>.
[ -n "${_OB_CONTROL_SM}" ] && return 0
_OB_CONTROL_SM='true'
ob_use messages
ob_use locale
_OB_SUBSTVARS_MAX_DEPTH=50
OB_CONTROL_NAME=
OB_CONTROL_VALUE=
ob_parse_control()
{
_ob_local _obpco_file _obpco_field_cb _obpco_req_fields _obpco_opt_fields \
_obpco_check_fields _obpco_all_fields _obpco_got_fields \
_obpco_line_nr _obpco_line _obpco_name _obpco_value
if [ ${#} -eq 2 ]; then
_obpco_file="${1}"
_obpco_field_cb="${2}"
_obpco_check_fields='false'
elif [ ${#} -eq 4 ]; then
_obpco_file="${1}"
_obpco_field_cb="${2}"
_obpco_req_fields="${3}"
_obpco_opt_fields="${4}"
_obpco_check_fields='true'
_obpco_all_fields=" ${_obpco_req_fields} ${_obpco_opt_fields} "
else
_ob_return 125
return ${?}
fi
_obpco_got_fields=' '
_obpco_line_nr=0
while IFS= read -r _obpco_line; do
_obpco_line_nr=$(($_obpco_line_nr + 1))
if [ -z "$(echo ${_obpco_line})" ]; then
_ob_parse_control_error "${_obpco_file}" "${_obpco_line_nr}" \
'control_empty_line'
elif [ "${_obpco_line#\#}" != "${_obpco_line}" ]; then
# Comment.
:
elif [ "${_obpco_line# }" = "${_obpco_line}" ]; then
# "Name: Value" line.
if [ -n "${_obpco_name}" ]; then
OB_CONTROL_NAME="${_obpco_name}"
OB_CONTROL_VALUE="${_obpco_value}"
"${_obpco_field_cb}"
if [ ${?} -ne 0 ]; then
_ob_return 0
return ${?}
fi
fi
_obpco_name="${_obpco_line%%:*}"
_obpco_value="${_obpco_line#*:}"
_obpco_value="${_obpco_value# }"
if [ -z "${_obpco_name}" \
-o "${_obpco_name}" = "${_obpco_line}" ]; then
# Badly formatted control field.
_ob_parse_control_error "${_obpco_file}" "${_obpco_line_nr}" \
'control_bad_nv'
continue
fi
if ${_obpco_check_fields}; then
if [ "${_obpco_all_fields% ${_obpco_name} *}" = \
"${_obpco_all_fields}" ]; then
# Unknown field.
_ob_parse_control_error \
"${_obpco_file}" "${_obpco_line_nr}" \
'control_unknown_field' "${_obpco_name}"
else
# Remove field from list of required fields.
_obpco_req_fields="$(echo "${_obpco_req_fields}" | \
sed "s/${_obpco_name}//")"
fi
fi
if [ "${_obpco_got_fields% ${_obpco_name} *}" != \
"${_obpco_got_fields}" ]; then
# Duplicate field.
_ob_parse_control_error "${_obpco_file}" "${_obpco_line_nr}" \
'control_duplicate_field' "${_obpco_name}"
else
_obpco_got_fields="${_obpco_got_fields}${_obpco_name} "
fi
else
# Continuation line.
if [ -z "${_obpco_name}" ]; then
# Expecting a "Name: Value" line.
_ob_parse_control_error "${_obpco_file}" "${_obpco_line_nr}" \
'control_found_continuation'
continue
fi
_obpco_value="${_obpco_value}
${_obpco_line# }"
fi
done <"${_obpco_file}"
if [ -n "${_obpco_name}" ]; then
OB_CONTROL_NAME="${_obpco_name}"
OB_CONTROL_VALUE="${_obpco_value}"
"${_obpco_field_cb}"
if [ ${?} -ne 0 ]; then
_ob_return 0
return ${?}
fi
fi
if ${_obpco_check_fields}; then
_obpco_req_fields="${_obpco_req_fields## }"
_obpco_req_fields="${_obpco_req_fields%% }"
if [ -n "${_obpco_req_fields}" ]; then
# Missing required control fields.
_obpco_req_fields="$(echo "${_obpco_req_fields}" | \
sed 's/ / /g' | \
sed "s/ /$(ob_get_msg 'list_item_separator')/g")"
_ob_parse_control_error "${_obpco_file}" '0' \
'control_missing_fields' \
"${_obpco_req_fields}"
fi
fi
_ob_return 0
return ${?}
}
ob_set_substvar()
{
_ob_local _obssv_name _obssv_value
if [ ${#} -eq 2 ]; then
_obssv_name="${1}"
_obssv_value="${2}"
else
_ob_return 125
return ${?}
fi
# Convert variable name to uppercase and validate.
_obssv_name="$(echo "${_obssv_name}" | tr 'a-z-' 'A-Z_')"
case "${_obssv_name:- }" in
*[!A-Z0-9_]*)
_ob_return 125
return ${?}
;;
esac
# Trim leading and trailing whitespace from value.
_obssv_value="$(echo "${_obssv_value}" | sed -n '
H; # Store each input line in the hold space.
${ # At the last line of input, …
g; # … restore the hold space into the pattern space, …
s/^[\n]*//; # … remove leading newline characters, …
s/[\n]*$//; # … remove trailing newline characters, and …
p; # … print the results.
};
')"
eval "_OB_SUBSTVAR_${_obssv_name}='${_obssv_value}'"
_ob_return 125
return ${?}
}
ob_substvars()
{
_ob_local _obsv_string _obsv_depth \
_obsv_lhs _obsv_name _obsv_rhs _obsv_old_rhs _obsv_value
if [ ${#} -eq 1 ]; then
_obsv_string="${1}"
else
_ob_return 125
return ${?}
fi
# Logic inspired by that of dpkg's Dpkg::Substvars::substvars() subroutine.
_obsv_depth=0
while true; do
_obsv_lhs="${_obsv_string%%\$\{*}"
if [ ${#_obsv_lhs} -eq ${#_obsv_string} ]; then
# No "${" was found.
break
fi
_obsv_string="${_obsv_string#*\$\{}"
_obsv_name="${_obsv_string%%\}*}"
_obsv_rhs="${_obsv_string#*\}}"
if [ ${#_obsv_rhs} -lt ${#_obsv_old_rhs} ]; then
# Reset the nesting counter if we've advanced the right side of the
# matched space.
_obsv_depth=0
fi
if [ ${_obsv_depth} -ge ${_OB_SUBSTVARS_MAX_DEPTH} ]; then
# Warn of possible recursion.
ob_warn "$(ob_get_msg 'substvar_deep_nesting')"
_ob_return 1
return ${?}
fi
_obsv_old_rhs="${_obsv_rhs}"
# Perform the substitution.
_obsv_name="$(echo "${_obsv_name}" | tr 'a-z-' 'A-Z_')"
_obsv_value="$(eval echo \"\$\{"_OB_SUBSTVAR_${_obsv_name}"\}\")"
_obsv_string="${_obsv_lhs}${_obsv_value}${_obsv_rhs}"
_obsv_depth=$(($_obsv_depth + 1))
done
printf '%s\n' "${_obsv_string}"
_ob_return 0
return ${?}
}
_ob_parse_control_error()
{
_ob_local _obpcoe_file _obpcoe_line_nr _obpcoe_msg_id \
_obpcoe_file_info _obpcoe_orig_text_domain
_obpcoe_file="${1}"
_obpcoe_line_nr="${2}"
_obpcoe_msg_id="${3}"
shift 3
if [ "${_obpcoe_line_nr}" -eq 0 ]; then
_obpcoe_file_info="$(printf '%20s:' "${_obpcoe_file}")"
else
_obpcoe_file_info="$(printf '%20s(l%d):' "${_obpcoe_file}" \
"${_obpcoe_line_nr}")"
fi
_obpcoe_orig_text_domain="$(ob_get_text_domain)"
ob_set_text_domain "${_OB_INTERNAL_TEXT_DOMAIN}"
ob_warn "${_obpcoe_file_info} $(ob_get_msg "${_obpcoe_msg_id}")" "${@}"
ob_set_text_domain "${_obpcoe_orig_text_domain}"
_ob_return 0
return ${?}
}
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