###########################################################
### SMB Build System					###
### - config.mk parsing functions			###
###							###
###  Copyright (C) Stefan (metze) Metzmacher 2004	###
###  Released under the GNU GPL				###
###########################################################

package config_mk;
use smb_build::input;

use strict;

my %attribute_types = (
	"NOPROTO" => "bool",
   	"REQUIRED_SUBSYSTEMS" => "list",
	"OUTPUT_TYPE" => "string",
	"INIT_OBJ_FILES" => "list",
	"ADD_OBJ_FILES" => "list",
	"OBJ_FILES" => "list",
	"SUBSYSTEM" => "string",
	"CFLAGS" => "list",
	"CPPFLAGS" => "list",
	"LDFLAGS" => "list",
	"LIBS" => "list",
	"INIT_FUNCTION" => "string",
	"MAJOR_VERSION" => "string",
	"MINOR_VERSION" => "string",
	"RELEASE_VERSION" => "string",
	"ENABLE" => "bool",
	"CMD" => "string",
	"MANPAGE" => "string"
);

###########################################################
# 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 alphanumeric 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;
}

sub import_file($$)
{
	my ($input, $filename) = @_;

	my $result = _parse_config_mk($filename);

	die ($result->{ERROR_STR}) unless $result->{ERROR_CODE} == 0;

	foreach my $section (keys %{$result}) {
		next if ($section eq "ERROR_CODE");
		my ($type, $name) = split(/::/, $section, 2);
		
		$input->{$name}{NAME} = $name;
		$input->{$name}{TYPE} = $type;

		foreach my $key (values %{$result->{$section}}) {
			$key->{VAL} = smb_build::input::strtrim($key->{VAL});
			my $vartype = $attribute_types{$key->{KEY}};
			if (not defined($vartype)) {
				die("Unknown attribute $key->{KEY}");
			}
			if ($vartype eq "string") {
				$input->{$name}{$key->{KEY}} = $key->{VAL};
			} elsif ($vartype eq "list") {
				$input->{$name}{$key->{KEY}} = [smb_build::input::str2array($key->{VAL})];
			} elsif ($vartype eq "bool") {
				if (($key->{VAL} ne "YES") and ($key->{VAL} ne "NO")) {
					die("Invalid value for bool attribute $key->{KEY}: $key->{VAL}");
				}
				$input->{$name}{$key->{KEY}} = $key->{VAL};
			}
		}
	}
}

sub import_files($$)
{
	my ($input, $config_list) = @_;

	open(IN, $config_list) or die("Can't open $config_list: $!");
	my @mkfiles = grep{!/^#/} <IN>;
	close(IN);

	$| = 1;

	foreach (@mkfiles) {
		s/\n//g;
		import_file($input, $_);
	}
}
1;