--- trunk/lib/WebPAC/Parser.pm	2006/09/24 18:52:35	689
+++ trunk/lib/WebPAC/Parser.pm	2006/09/25 13:08:17	702
@@ -3,13 +3,13 @@
 use warnings;
 use strict;
 
-use base qw/WebPAC::Common WebPAC::Normalize/;
 
 use PPI;
 use PPI::Dumper;
 use Data::Dump qw/dump/;
 use File::Slurp;
 
+use base qw/WebPAC::Common WebPAC::Normalize/;
 
 =head1 NAME
 
@@ -17,14 +17,24 @@
 
 =head1 VERSION
 
-Version 0.02
+Version 0.04
 
 =cut
 
-our $VERSION = '0.02';
+our $VERSION = '0.04';
 
 =head1 SYNOPSIS
 
+This module will parse L<WebPAC::Normalize/lookup> directives and generate source
+to produce lookups and normalization.
+
+It's written using L<PPI>, pure-perl parser for perl and heavily influenced by
+reading about LISP. It might be a bit over-the board, but at least it removed
+separate configuration files for lookups.
+
+This is experimental code, but it replaces all older formats which where,
+at one point in time, available in WebPAC.
+
 FIXME
 
 =head1 FUNCTIONS
@@ -51,48 +61,106 @@
 
 	$log->logdie("can't iterate_inputs over this config object") unless ($self->{config}->can('iterate_inputs'));
 
-	my $source;
+	$self->read_sources;
+
+	$self ? return $self : return undef;
+}
+
+=head2 read_sources
+
+  my $source_files = $parser->read_sources;
+
+Called by L</new>.
+
+=cut
+
+sub read_sources {
+	my $self = shift;
+
+	my $log = $self->_get_logger();
+
+	my $nr = 0;
+
+	my @lookups;
 
 	$self->{config}->iterate_inputs( sub {
 		my ($input, $database) = @_;
-		my $path = $input->{normalize}->{path} || return;
-		my $full = $self->{base_path} ? $self->{base_path} . '/' . $path : $path;
-		$log->logdie("normalization input $full doesn't exist") unless (-e $full);
-		my $s = read_file( $full ) || $log->logdie("can't read $full: $!");
-		my $input_name = $input->{name} || $log->logdie("can't deduce name of input: ", dump( $input ));
-		$log->debug("$database/$input_name: adding $path to parser [",length($s)," bytes]");
-		$source .= $s;
-		$self->{valid_inputs}->{$database}->{$input_name}++;
+
+		$log->debug("database: $database input = ", dump($input));
+
+		foreach my $normalize (@{ $input->{normalize} }) {
+
+			my $path = $normalize->{path};
+			return unless($path);
+			my $full = $self->{base_path} ? $self->{base_path} . '/' . $path : $path;
+
+			$log->logdie("normalization input $full doesn't exist") unless (-e $full);
+
+			my $s = read_file( $full ) || $log->logdie("can't read $full: $!");
+
+			my $input_name = _input_name($input) || $log->logdie("can't deduce name of input: ", dump( $input ));
+
+			$log->debug("$database/$input_name: adding $path");
+
+			$self->{valid_inputs}->{$database}->{$input_name}++;
+
+			push @lookups, sub {
+				$self->parse_lookups( $database, $input_name, $full, $s );
+			};
+
+			$nr++;
+		}
 	} );
 
-	$log->debug("collected ", length($source), " bytes of source");
+	$log->debug("found $nr source files");
 
-	$self->{source} = $source;
+	# parse all lookups
+	$_->() foreach (@lookups);
 
-	$self ? return $self : return undef;
+	return $nr;
 }
 
-=head2 parse
+=head2 parse_lookups
+
+  $parser->parse_lookups($database,$input,$path,$source);
+
+Called for each normalize source in each input by L</new>
+
+It will report invalid databases and inputs in error log after parsing.
 
 =cut
 
-sub parse {
+sub parse_lookups {
 	my $self = shift;
+	my ($database, $input, $path, $source) = @_;
+
+	$input = _input_name($input);
 
 	my $log = $self->_get_logger();
 
-	$log->logdie('no source found in object') unless ($self->{source});
+	$log->logdie("invalid database $database" ) unless $self->valid_database( $database );
+	$log->logdie("invalid input $input of database $database", ) unless $self->valid_database_input( $database, $input );
+
+	$log->logdie("no source found for database $database input $input path $path") unless ($source);
 
-	$log->debug("valid_inputs = ", dump( $self->{valid_inputs} ));
+	$log->info("parsing lookups for $database/$input from $path (",length($source)," bytes)");
 
-	my $Document = PPI::Document->new( \$self->{source} ) || $log->logdie("can't parse source:\n", $self->{source});
+	my $Document = PPI::Document->new( \$source ) || $log->logdie("can't parse source:\n", $self->{source});
 
 	$Document->prune('PPI::Token::Whitespace');
 	#$Document->prune('PPI::Token::Operator');
 
 	# Find all the named subroutines
 
-	my $eval_create;
+	$self->{_lookup_errors} = ();
+
+	sub _lookup_error {
+		my $self = shift;
+		my $msg = shift;
+		$self->_get_logger->logconfess("error without message?") unless ($msg);
+		push @{ $self->{_lookup_errors} }, $msg;
+		return '';
+	}
 
 	$Document->find( sub {
 			my ($Document,$Element) = @_;
@@ -154,10 +222,19 @@
 
 			$log->debug("create: $create");
 
-			$log->logdie("invalid database $e[3]" ) unless $self->valid_database( $e[3] );
-			$log->logdie("invalid input $e[5] of database $e[3]", ) unless $self->valid_database_input( $e[3], $e[5] );
+			return $self->_lookup_error("invalid database $e[3] in $path" ) unless $self->valid_database( $e[3] );
+			return $self->_lookup_error("invalid input $e[5] of database $e[3] in $path", ) unless $self->valid_database_input( $e[3], $e[5] );
 
-			$eval_create->{ $e[3] }->{ $e[5] } .= $create;
+			# save code to create this lookup
+			$self->{_lookup_create}->{ _q($e[3]) }->{ _q($e[5]) }->{ _q($key) } .= $create;
+
+
+			if (defined( $self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }->{ $key } )) {
+				$log->warn("dependency of $database/$input on $e[3]/$e[5] with $key allready recorded");
+			}
+
+			# save this dependency
+			$self->{depends}->{ $database }->{ $input }->{ _q($e[3]) }->{ _q($e[5]) }->{$key}++;
 
 			if ($#e < 10) {
 				$e[8]->insert_after( $e[8]->clone );
@@ -173,17 +250,35 @@
 			$log->debug(">>> ", $Element->snext_sibling);
 	});
 
-	$log->info("create: ", dump($eval_create) );
-	$log->info("lookup: ", $Document->serialize );
+	my $normalize_source = $Document->serialize;
+	$log->debug("create: ", dump($self->{_lookup_create}) );
+	$log->debug("normalize: $normalize_source");
+
+	$self->{_normalize_source}->{$database}->{$input} = $normalize_source;
 
 	if ($self->{debug}) {
 		my $Dumper = PPI::Dumper->new( $Document );
 		$Dumper->print;
 	}
 
+	$log->error("Parser errors:\n", join("\n",@{ $self->{_lookup_errors} }) ) if ($self->{_lookup_errors});
+
 	return 1;
 }
 
+
+=head2 lookup_create_rules
+
+  my $source = $parser->lookup_create_rules($database, $input);
+
+=cut
+
+sub lookup_create_rules {
+	my $self = shift;
+	my ($database,$input) = @_;
+	return $self->{_lookup_create}->{ _q($database) }->{ _q($input) };
+}
+
 =head2 valid_database
 
   my $ok = $parse->valid_database('key');
@@ -194,9 +289,8 @@
 	my $self = shift;
 
 	my $database = shift || return;
-	$database =~ s/['"]//g;
 
-	return defined($self->{valid_inputs}->{$database});
+	return defined($self->{valid_inputs}->{ _q($database) });
 }
 
 =head2 valid_database_input
@@ -209,12 +303,64 @@
 	my $self = shift;
 
 	my ($database,$input) = @_;
-	$database =~ s/['"]//g;
-	$input =~ s/['"]//g;
+	return defined($self->{valid_inputs}->{ _q($database) }->{ _q($input) });
+}
+
+=head2 depends
+
+Return all databases and inputs on which specified one depends
+
+  $depends_on = $parser->depends('database','input');
+
+=cut
+
+sub depends {
+	my $self = shift;
+	my ($database,$input) = @_;
+	$self->_get_logger->debug("depends($database,$input)");
+	return unless (
+		defined( $self->{depends}->{ _q($database) } ) &&
+		defined( $self->{depends}->{ _q($database) }->{ _q($input) } )
+	);
+	return $self->{depends}->{ _q($database) }->{ _q($input) };
+}
+
+=head1 PRIVATE
+
+=head2 _q
+
+Strip single or double quotes around value
+
+  _q(qq/'foo'/) -> foo
+
+=cut
 
-	return defined($self->{valid_inputs}->{$database}->{$input});
+sub _q {
+	my $v = shift || return;
+	$v =~ s/^['"]*//g;
+	$v =~ s/['"]*$//g;
+	return $v;
 }
 
+=head2 _input_name
+
+Return C<name> value if HASH or arg if scalar
+
+  _input_name($input)
+
+=cut
+
+sub _input_name {
+	my $input = shift || return;
+	if (ref($input) eq 'HASH') {
+		die "can't find 'name' value in ", dump($input) unless defined($input->{name});
+		return $input->{name};
+	} else {
+		return $input;
+	}
+}
+
+
 =head1 AUTHOR
 
 Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>