# $Id: DocType.pm,v 1.3 2003/07/30 13:39:22 matt Exp $

package XML::SAX::PurePerl;

use strict;

use XML::SAX::PurePerl::Productions qw($PubidChar);

sub doctypedecl {

    my ($self, $reader) = @_;

    my $data = $reader->data(9);

    if ($data =~ /^<!DOCTYPE/) {

        $reader->move_along(9);

        $self->skip_whitespace($reader) ||

            $self->parser_error("No whitespace after doctype declaration", $reader);

        my $root_name = $self->Name($reader) ||

            $self->parser_error("Doctype declaration has no root element name", $reader);

        if ($self->skip_whitespace($reader)) {

            # might be externalid...

            my %dtd = $self->ExternalID($reader);

            # TODO: Call SAX event

        }

        $self->skip_whitespace($reader);

        $self->InternalSubset($reader);

        $reader->match('>') or $self->parser_error("Doctype not closed", $reader);

        return 1;

    }

    return 0;

}

sub ExternalID {

    my ($self, $reader) = @_;

    my $data = $reader->data(6);

    if ($data =~ /^SYSTEM/) {

        $reader->move_along(6);

        $self->skip_whitespace($reader) ||

            $self->parser_error("No whitespace after SYSTEM identifier", $reader);

        return (SYSTEM => $self->SystemLiteral($reader));

    }

    elsif ($data =~ /^PUBLIC/) {

        $reader->move_along(6);

        $self->skip_whitespace($reader) ||

            $self->parser_error("No whitespace after PUBLIC identifier", $reader);

        my $quote = $self->quote($reader) || 

            $self->parser_error("Not a quote character in PUBLIC identifier", $reader);

        my $data = $reader->data;

        my $pubid = '';

        while(1) {

            $self->parser_error("EOF while looking for end of PUBLIC identifiier", $reader)

                unless length($data);

            if ($data =~ /^([^$quote]*)$quote/) {

                $pubid .= $1;

                $reader->move_along(length($1) + 1);

                last;

            }

            else {

                $pubid .= $data;

                $reader->move_along(length($data));

                $data = $reader->data;

            }

        }

        if ($pubid !~ /^($PubidChar)+$/) {

            $self->parser_error("Invalid characters in PUBLIC identifier", $reader);

        }

        $self->skip_whitespace($reader) ||

            $self->parser_error("Not whitespace after PUBLIC ID in DOCTYPE", $reader);

        return (PUBLIC => $pubid, 

                SYSTEM => $self->SystemLiteral($reader));

    }

    else {

        return;

    }

    return 1;

}

sub SystemLiteral {

    my ($self, $reader) = @_;

    my $quote = $self->quote($reader);

    my $data = $reader->data;

    my $systemid = '';

    while (1) {

        $self->parser_error("EOF found while looking for end of Sytem Literal", $reader)

            unless length($data);

        if ($data =~ /^([^$quote]*)$quote/) {

            $systemid .= $1;

            $reader->move_along(length($1) + 1);

            return $systemid;

        }

        else {

            $systemid .= $data;

            $reader->move_along(length($data));

            $data = $reader->data;

        }

    }

}

sub InternalSubset {

    my ($self, $reader) = @_;

    return 0 unless $reader->match('[');

    1 while $self->IntSubsetDecl($reader);

    $reader->match(']') or $self->parser_error("No close bracket on internal subset (found: " . $reader->data, $reader);

    $self->skip_whitespace($reader);

    return 1;

}

sub IntSubsetDecl {

    my ($self, $reader) = @_;

    return $self->DeclSep($reader) || $self->markupdecl($reader);

}

sub DeclSep {

    my ($self, $reader) = @_;

    if ($self->skip_whitespace($reader)) {

        return 1;

    }

    if ($self->PEReference($reader)) {

        return 1;

    }

#    if ($self->ParsedExtSubset($reader)) {

#        return 1;

#    }

    return 0;

}

sub PEReference {

    my ($self, $reader) = @_;

    return 0 unless $reader->match('%');

    my $peref = $self->Name($reader) ||

        $self->parser_error("PEReference did not find a Name", $reader);

    # TODO - load/parse the peref

    $reader->match(';') or $self->parser_error("Invalid token in PEReference", $reader);

    return 1;

}

sub markupdecl {

    my ($self, $reader) = @_;

    if ($self->elementdecl($reader) ||

        $self->AttlistDecl($reader) ||

        $self->EntityDecl($reader) ||

        $self->NotationDecl($reader) ||

        $self->PI($reader) ||

        $self->Comment($reader))

    {

        return 1;

    }

    return 0;

}

1;