93 lines
2.2 KiB
Perl
93 lines
2.2 KiB
Perl
# $Id: Tree.pm,v 1.2 2003-07-31 07:54:51 matt Exp $
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package XML::Parser::Style::Tree;
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$XML::Parser::Built_In_Styles{Tree} = 1;
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sub Init {
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my $expat = shift;
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$expat->{Lists} = [];
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$expat->{Curlist} = $expat->{Tree} = [];
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}
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sub Start {
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my $expat = shift;
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my $tag = shift;
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my $newlist = [ {@_} ];
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push @{ $expat->{Lists} }, $expat->{Curlist};
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push @{ $expat->{Curlist} }, $tag => $newlist;
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$expat->{Curlist} = $newlist;
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}
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sub End {
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my $expat = shift;
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my $tag = shift;
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$expat->{Curlist} = pop @{ $expat->{Lists} };
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}
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sub Char {
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my $expat = shift;
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my $text = shift;
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my $clist = $expat->{Curlist};
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my $pos = $#$clist;
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if ( $pos > 0 and $clist->[ $pos - 1 ] eq '0' ) {
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$clist->[$pos] .= $text;
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}
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else {
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push @$clist, 0 => $text;
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}
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}
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sub Final {
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my $expat = shift;
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delete $expat->{Curlist};
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delete $expat->{Lists};
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$expat->{Tree};
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}
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1;
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__END__
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=head1 NAME
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XML::Parser::Style::Tree - Tree style parser
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=head1 SYNOPSIS
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use XML::Parser;
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my $p = XML::Parser->new(Style => 'Tree');
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my $tree = $p->parsefile('foo.xml');
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=head1 DESCRIPTION
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This module implements XML::Parser's Tree style parser.
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When parsing a document, C<parse()> will return a parse tree for the
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document. Each node in the tree
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takes the form of a tag, content pair. Text nodes are represented with
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a pseudo-tag of "0" and the string that is their content. For elements,
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the content is an array reference. The first item in the array is a
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(possibly empty) hash reference containing attributes. The remainder of
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the array is a sequence of tag-content pairs representing the content
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of the element.
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So for example the result of parsing:
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<foo><head id="a">Hello <em>there</em></head><bar>Howdy<ref/></bar>do</foo>
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would be:
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Tag Content
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==================================================================
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[foo, [{}, head, [{id => "a"}, 0, "Hello ", em, [{}, 0, "there"]],
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bar, [ {}, 0, "Howdy", ref, [{}]],
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0, "do"
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]
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]
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The root document "foo", has 3 children: a "head" element, a "bar"
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element and the text "do". After the empty attribute hash, these are
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represented in it's contents by 3 tag-content pairs.
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=cut
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