Koha/C4/TTParser.pm
2012-07-12 16:06:21 +02:00

171 lines
5.8 KiB
Perl

#!/usr/bin/env perl
# Copyright Tamil 2011
#
# This file is part of Koha.
#
# Koha 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.
#
# Koha 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 Koha; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#simple parser for HTML with Template Toolkit directives. Tokens are put into @tokens and are accesible via next_token and peep_token
package C4::TTParser;
use base qw(HTML::Parser);
use C4::TmplToken;
use strict;
use warnings;
#seems to be handled post tokenizer
##hash where key is tag we are interested in and the value is a hash of the attributes we want
#my %interesting_tags = (
# img => { alt => 1 },
#);
#tokens found so far (used like a stack)
my ( @tokens );
#shiftnext token or undef
sub next_token{
return shift @tokens;
}
#unshift token back on @tokens
sub unshift_token{
my $self = shift;
unshift @tokens, shift;
}
#have a peep at next token
sub peep_token{
return $tokens[0];
}
#wrapper for parse
#please use this method INSTEAD of the HTML::Parser->parse_file method (and HTML::Parser->parse)
#signature build_tokens( self, filename)
sub build_tokens{
my ($self, $filename) = @_;
$self->{filename} = $filename;
$self->handler(start => "start", "self, line, tagname, attr, text"); #signature is start( self, linenumber, tagname, hash of attributes, origional text )
$self->handler(text => "text", "self, line, text, is_cdata"); #signature is text( self, linenumber, origional text, is_cdata )
$self->handler(end => "end", "self, line, tag, attr, text"); #signature is end( self, linenumber, tagename, origional text )
$self->handler(declaration => "declaration", "self, line, text, is_cdata"); # declaration
$self->handler(comment => "comment", "self, line, text, is_cdata"); # comments
# $self->handler(default => "default", "self, line, text, is_cdata"); # anything else
$self->marked_sections(1); #treat anything inside CDATA tags as text, should really make it a C4::TmplTokenType::CDATA
$self->unbroken_text(1); #make contiguous whitespace into a single token (can span multiple lines)
$self->parse_file($filename);
return $self;
}
#handle parsing of text
sub text{
my $self = shift;
my $line = shift;
my $work = shift; # original text
my $is_cdata = shift;
while($work){
# if there is a template_toolkit tag
if( $work =~ m/\[%.*?\]/ ){
#everything before this tag is text (or possibly CDATA), add a text token to tokens if $`
if( $` ){
my $t = C4::TmplToken->new( $`, ($is_cdata? C4::TmplTokenType::CDATA : C4::TmplTokenType::TEXT), $line, $self->{filename} );
push @tokens, $t;
}
#the match itself is a DIRECTIVE $&
my $t = C4::TmplToken->new( $&, C4::TmplTokenType::DIRECTIVE, $line, $self->{filename} );
push @tokens, $t;
# put work still to do back into work
$work = $' ? $' : 0;
} else {
# If there is some left over work, treat it as text token
my $t = C4::TmplToken->new( $work, ($is_cdata? C4::TmplTokenType::CDATA : C4::TmplTokenType::TEXT), $line, $self->{filename} );
push @tokens, $t;
last;
}
}
}
sub declaration {
my $self = shift;
my $line = shift;
my $work = shift; #original text
my $is_cdata = shift;
my $t = C4::TmplToken->new( $work, ($is_cdata? C4::TmplTokenType::CDATA : C4::TmplTokenType::TEXT), $line, $self->{filename} );
push @tokens, $t;
}
sub comment {
my $self = shift;
my $line = shift;
my $work = shift; #original text
my $is_cdata = shift;
my $t = C4::TmplToken->new( $work, ($is_cdata? C4::TmplTokenType::CDATA : C4::TmplTokenType::TEXT), $line, $self->{filename} );
push @tokens, $t;
}
sub default {
my $self = shift;
my $line = shift;
my $work = shift; #original text
my $is_cdata = shift;
my $t = C4::TmplToken->new( $work, ($is_cdata? C4::TmplTokenType::CDATA : C4::TmplTokenType::TEXT), $line, $self->{filename} );
push @tokens, $t;
}
#handle opening html tags
sub start{
my $self = shift;
my $line = shift;
my $tag = shift;
my $hash = shift; #hash of attr/value pairs
my $text = shift; #origional text
my $t = C4::TmplToken->new( $text, C4::TmplTokenType::TAG, $line, $self->{filename});
my %attr;
# tags seem to be uses in an 'interesting' way elsewhere..
for my $key( %$hash ) {
next unless defined $hash->{$key};
if ($key eq "/"){
$attr{+lc($key)} = [ $key, $hash->{$key}, $key."=".$hash->{$key}, 1 ];
}
else {
$attr{+lc($key)} = [ $key, $hash->{$key}, $key."=".$hash->{$key}, 0 ];
}
}
$t->set_attributes( \%attr );
push @tokens, $t;
}
#handle closing html tags
sub end{
my $self = shift;
my $line = shift;
my $tag = shift;
my $hash = shift;
my $text = shift;
# what format should this be in?
my $t = C4::TmplToken->new( $text, C4::TmplTokenType::TAG, $line, $self->{filename} );
my %attr;
# tags seem to be uses in an 'interesting' way elsewhere..
for my $key( %$hash ) {
next unless defined $hash->{$key};
$attr{+lc($key)} = [ $key, $hash->{$key}, $key."=".$hash->{$key}, 0 ];
}
$t->set_attributes( \%attr );
push @tokens, $t;
}
1;