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###########################################################
### SMB Build System ###
### - config.mk parsing functions ###
### ###
### Copyright (C) Stefan (metze) Metzmacher 2004 ###
### Released under the GNU GPL ###
###########################################################
package config_mk;
use input;
use strict;
###########################################################
# The parsing function which parses the file
#
# $result = _parse_config_mk($filename)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $result - the resulting structure
#
# $result->{ERROR_CODE} - the error_code, '0' means success
# $result->{ERROR_STR} - the error string
#
# $result->{$key}{KEY} - the key == the variable which was parsed
# $result->{$key}{VAL} - the value of the variable
sub _parse_config_mk($)
{
my $filename = shift;
my $result;
my $linenum = -1;
my $waiting = 0;
my $section = "GLOBAL";
my $key;
$result->{ERROR_CODE} = -1;
open(CONFIG_MK, "< $filename") || die ("Can't open $filename\n");
while (<CONFIG_MK>) {
my $line = $_;
my $val;
$linenum++;
#
# lines beginnig with '#' are ignored
#
if ($line =~ /^\#.*$/) {
next;
}
#
#
#
if (($waiting == 0) && ($line =~ /^\[([a-zA-Z0-9_:]+)\][\t ]*$/)) {
$section = $1;
next;
}
#
# 1.) lines with an aplhanumeric character indicate
# a new variable,
# 2.) followed by zero or more whitespaces or tabs
# 3.) then one '=' character
# 4.) followed by the value of the variable
# 5.) a newline ('\n') can be escaped by a '\' before the newline
# and the next line needs to start with a tab ('\t')
#
if (($waiting == 0) && ($line =~ /^([a-zA-Z0-9_]+)[\t ]*=(.*)$/)) {
$key = $1;
$val = $2;
#
# when we have a '\' before the newline
# then skip it and wait for the next line.
#
if ($val =~ /(.*)(\\)$/) {
$val = $1;
$waiting = 1;
} else {
$waiting = 0;
}
$result->{$section}{$key}{KEY} = $key;
$result->{$section}{$key}{VAL} = $val;
next;
}
#
# when we are waiting for a value to continue then
# check if it has a leading tab.
#
if (($waiting == 1) && ($line =~ /^\t(.*)$/)) {
$val = $1;
#
# when we have a '\' before the newline
# then skip it and wait for the next line.
#
if ($val =~ /(.*)( \\)$/) {
$val = $1;
$waiting = 1;
} else {
$waiting = 0;
}
$result->{$section}{$key}{VAL} .= " ";
$result->{$section}{$key}{VAL} .= $val;
next;
}
#
# catch empty lines they're ignored
# and we're no longer waiting for the value to continue
#
if ($line =~ /^$/) {
$waiting = 0;
next;
}
close(CONFIG_MK);
$result->{ERROR_STR} = "Bad line while parsing $filename\n$filename:$linenum: $line";
return $result;
}
close(CONFIG_MK);
$result->{ERROR_CODE} = 0;
return $result;
}
###########################################################
# A caching function to avoid to parse
# a file twice or more
#
# $result = _get_parse_results($filename)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $result - the resulting structure
#
# $result->{ERROR_CODE} - the error_code, '0' means success
# $result->{ERROR_STR} - the error string
#
# $result->{$key}{KEY} - the key == the variable which was parsed
# $result->{$key}{VAL} - the value of the variable
my $_get_parse_results_cache;
sub _get_parse_results($)
{
my $filename = shift;
if ((!defined($_get_parse_results_cache->{$filename}{ERROR_CODE}))
||($_get_parse_results_cache->{$filename}{ERROR_CODE} != 0)) {
$_get_parse_results_cache->{$filename} = _parse_config_mk($filename);
}
return $_get_parse_results_cache->{$filename};
}
###########################################################
# The fetching function to fetch the value of a variable
# out of the file
#
# $value = _fetch_var_from_config_mk($filename,$section,$variable)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $section - the section name of the variable
#
# $variable - the variable name of which we want the value
#
# $value - the value of the variable
sub _fetch_var_from_config_mk($$$)
{
my $filename = shift;
my $section = shift;
my $key = shift;
my $val = "";
my $result;
$result = _get_parse_results($filename);
if ($result->{ERROR_CODE} != 0) {
die ($result->{ERROR_STR});
}
if (defined($result->{$section}{$key})) {
$val = input::strtrim($result->{$section}{$key}{VAL});
} elsif (defined($result->{DEFAULT}{$key})) {
$val = input::strtrim($result->{DEFAULT}{$key}{VAL});
}
return $val;
}
###########################################################
# The fetching function to fetch the array of values of a variable
# out of the file
#
# $array = _fetch_array_from_config_mk($filename,$section,$variable)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $section - the section name of the variable
#
# $variable - the variable name of which we want the value
#
# $array - the array of values of the variable
sub _fetch_array_from_config_mk($$$)
{
my $filename = shift;
my $section = shift;
my $key = shift;
my @val = ();
my $result;
$result = _get_parse_results($filename);
if ($result->{ERROR_CODE} != 0) {
die ($result->{ERROR_STR});
}
if (defined($result->{$section}{$key})) {
@val = input::str2array($result->{$section}{$key}{VAL});
} elsif (defined($result->{DEFAULT}{$key})) {
@val = input::str2array($result->{DEFAULT}{$key}{VAL});
}
return @val;
}
###########################################################
# A function for fetching MODULE_<module>_<parameter>
# variables out of a config.mk file
#
# $value = module_get_var($filename,$module,$parameter)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $module - the middle part of the variable name of which we want the value
#
# $parameter - the last part of the variable name of which we want the value
#
# $value - the value of the variable
sub module_get_var($$$)
{
my $filename = shift;
my $module = shift;
my $var = shift;
my $section = "MODULE::".$module;
return _fetch_var_from_config_mk($filename,$section,$var);
}
###########################################################
# A function for fetching MODULE_<module>_<parameter>
# variables out of a config.mk file
#
# $array = module_get_array($filename,$module,$parameter)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $module - the middle part of the variable name of which we want the value
#
# $parameter - the last part of the variable name of which we want the value
#
# $array - the array of values of the variable
sub module_get_array($$$)
{
my $filename = shift;
my $module = shift;
my $var = shift;
my $section = "MODULE::".$module;
return _fetch_array_from_config_mk($filename,$section,$var);
}
###########################################################
# A function for fetching SUBSYSTEM_<subsystem>_<parameter>
# variables out of a config.mk file
#
# $value = subsystem_get_var($filename,$subsystem,$parameter)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $subsystem - the middle part of the variable name of which we want the value
#
# $parameter - the last part of the variable name of which we want the value
#
# $value - the value of the variable
sub subsystem_get_var($$$)
{
my $filename = shift;
my $subsystem = shift;
my $var = shift;
my $section = "SUBSYSTEM::".$subsystem;
return _fetch_var_from_config_mk($filename,$section,$var);
}
###########################################################
# A function for fetching SUBSYSTEM_<subsystem>_<parameter>
# variables out of a config.mk file
#
# $array = subsystem_get_array($filename,$subsystem,$parameter)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $subsystem - the middle part of the variable name of which we want the value
#
# $parameter - the last part of the variable name of which we want the value
#
# $array - the array of values of the variable
sub subsystem_get_array($$$)
{
my $filename = shift;
my $subsystem = shift;
my $var = shift;
my $section = "SUBSYSTEM::".$subsystem;
return _fetch_array_from_config_mk($filename,$section,$var);
}
###########################################################
# A function for fetching LIBRARY_<library>_<parameter>
# variables out of a config.mk file
#
# $value = library_get_var($filename,$library,$parameter)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $library - the middle part of the variable name of which we want the value
#
# $parameter - the last part of the variable name of which we want the value
#
# $value - the value of the variable
sub library_get_var($$$)
{
my $filename = shift;
my $library = shift;
my $var = shift;
my $section = "LIBRARY::".$library;
return _fetch_var_from_config_mk($filename,$section,$var);
}
###########################################################
# A function for fetching LIBRARY_<library>_<parameter>
# variables out of a config.mk file
#
# $array = library_get_array($filename,$library,$parameter)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $library - the middle part of the variable name of which we want the value
#
# $parameter - the last part of the variable name of which we want the value
#
# $array - the array of values of the variable
sub library_get_array($$$)
{
my $filename = shift;
my $library = shift;
my $var = shift;
my $section = "LIBRARY::".$library;
return _fetch_array_from_config_mk($filename,$section,$var);
}
###########################################################
# A function for fetching BINARY_<binary>_<parameter>
# variables out of a config.mk file
#
# $value = binary_get_var($filename,$binary,$parameter)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $binary - the middle part of the variable name of which we want the value
#
# $parameter - the last part of the variable name of which we want the value
#
# $value - the value of the variable
sub binary_get_var($$$)
{
my $filename = shift;
my $binary = shift;
my $var = shift;
my $section = "BINARY::".$binary;
return _fetch_var_from_config_mk($filename,$section,$var);
}
###########################################################
# A function for fetching BINARY_<binary>_<parameter>
# variables out of a config.mk file
#
# $array = binary_get_array($filename,$binary,$parameter)
#
# $filename - the path of the config.mk file
# which should be parsed
#
# $binary - the middle part of the variable name of which we want the value
#
# $parameter - the last part of the variable name of which we want the value
#
# $array - the array of values of the variable
sub binary_get_array($$$)
{
my $filename = shift;
my $binary = shift;
my $var = shift;
my $section = "BINARY::".$binary;
return _fetch_array_from_config_mk($filename,$section,$var);
}
1;
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