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