view Lib/IMPL/DOM/XMLReader.pm @ 315:77df11605d3a

code cleanup
author cin
date Tue, 07 May 2013 02:19:24 +0400
parents 4ddb27ff4a0b
children 010ceafd0c5a
line wrap: on
line source

package IMPL::DOM::XMLReader;
use strict;
use warnings;

use parent qw(IMPL::Object IMPL::Object::Autofill);

use IMPL::Class::Property;
use XML::Parser;

use IMPL::require {
    Schema => 'IMPL::DOM::Schema', # IMPL::DOM::Schema references IMPL::DOM::XML::Reader
    Builder => 'IMPL::DOM::Navigator::Builder',
    SimpleBuilder => 'IMPL::DOM::Navigator::SimpleBuilder'
};

__PACKAGE__->PassThroughArgs;

BEGIN {
    public _direct property Navigator => prop_get | owner_set;
    public _direct property SkipWhitespace => prop_get | owner_set;
    private _direct property _current => prop_all;
    private _direct property _text => prop_all;
    private _direct property _textHistory => prop_all;
}

sub Parse {
    my ($this,$in) = @_;
    
    my $parser = new XML::Parser(
        Handlers => {
            Start => sub {shift; goto &OnStart($this,@_)},
            End => sub {shift; goto &OnEnd($this,@_)},
            Char => sub {shift; goto &OnChar($this,@_)}
        }
    );
    
    $parser->parse($in);
}

sub ParseFile {
    my ($this,$in) = @_;
    
    my $parser = new XML::Parser(
        Handlers => {
            Start => sub {shift; unshift @_, $this; goto &_OnBegin;},
            End => sub {shift; unshift @_, $this; goto &_OnEnd;},
            Char => sub {shift; unshift @_, $this; goto &_OnChar;}
        }
    );
    
    $parser->parsefile($in);
}

sub _OnBegin {
    my ($this,$element,%attrs) = @_;
    
    push @{$this->{$_textHistory}},$this->{$_text};
    $this->{$_text} = "";
    $this->{$_current} = $this->Navigator->NavigateCreate($element,%attrs);
}

sub _OnEnd {
    my ($this,$element) = @_;
    $this->{$_current}->nodeValue($this->Navigator->inflateValue( $this->{$_text} ) ) if length $this->{$_text} and (not $this->{$SkipWhitespace} or $this->{$_text} =~ /\S/);
    $this->{$_text} = pop @{$this->{$_textHistory}};
    $this->{$_current} = $this->Navigator->Back;
}

sub _OnChar {
    my ($this,$val) = @_;
    $this->{$_text} .= $val;
}

sub LoadDocument {
    my ($self,$file,$schema) = @_;
    
    my $parser;
    if ($schema) {
        $schema = IMPL::DOM::Schema->LoadSchema($schema) if not ref $schema;
        $parser = $self->new(
            Navigator => IMPL::DOM::Navigator::Builder->new(
                'IMPL::DOM::Document',
                $schema
            )
        );
    } else {
        $parser = $self->new(
            Navigator => IMPL::DOM::Navigator::SimpleBuilder->new()
        );
    }
    
    $parser->ParseFile($file);
    my $doc = $parser->Navigator->Document;
    if ($schema) {
        my @errors = $parser->Navigator->BuildErrors;
        push @errors, $schema->Validate($doc);
        die new IMPL::Exception("Loaded document doesn't match the schema", @errors) if @errors;
    }
    return $doc;
}

1;

__END__

=pod

=head1 SYNOPSIS

my $reader = new IMPL::DOM::XMLReader(Navigator => $DomBuilder);
my $obj = $reader->parsefile("data.xml");

=head1 DESCRIPTION

Простой класс, использующий навигатор для постороения документа. В зависимости от
используемого навигатора может быть получен различный результат.

Навигатор должен поодерживать методы C<NavigateCreate> и C<Back>

=head1 METHODS

=over

=item C<CTOR(Naviagtor => $builder)>

Создает новый экземпляр парсера, с указанным навигатором для построения документа

=item C<$obj->Parse($in)>

Строит документ. На вход получает либо xml строку, либо HANDLE.

=item C<$obj->ParseFile($fileName)>

Строит документ из файла с именем C<$fileName>.

=back

=cut