| 1 | # $Id: Tree.pm,v 1.2 2003-07-31 07:54:51 matt Exp $
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| 2 |
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| 3 | package XML::Parser::Style::Tree;
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| 4 | $XML::Parser::Built_In_Styles{Tree} = 1;
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| 5 |
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| 6 | sub Init {
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| 7 | my $expat = shift;
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| 8 | $expat->{Lists} = [];
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| 9 | $expat->{Curlist} = $expat->{Tree} = [];
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| 10 | }
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| 11 |
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| 12 | sub Start {
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| 13 | my $expat = shift;
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| 14 | my $tag = shift;
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| 15 | my $newlist = [ { @_ } ];
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| 16 | push @{ $expat->{Lists} }, $expat->{Curlist};
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| 17 | push @{ $expat->{Curlist} }, $tag => $newlist;
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| 18 | $expat->{Curlist} = $newlist;
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| 19 | }
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| 20 |
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| 21 | sub End {
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| 22 | my $expat = shift;
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| 23 | my $tag = shift;
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| 24 | $expat->{Curlist} = pop @{ $expat->{Lists} };
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| 25 | }
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| 26 |
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| 27 | sub Char {
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| 28 | my $expat = shift;
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| 29 | my $text = shift;
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| 30 | my $clist = $expat->{Curlist};
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| 31 | my $pos = $#$clist;
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| 32 |
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| 33 | if ($pos > 0 and $clist->[$pos - 1] eq '0') {
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| 34 | $clist->[$pos] .= $text;
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| 35 | } else {
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| 36 | push @$clist, 0 => $text;
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| 37 | }
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| 38 | }
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| 39 |
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| 40 | sub Final {
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| 41 | my $expat = shift;
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| 42 | delete $expat->{Curlist};
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| 43 | delete $expat->{Lists};
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| 44 | $expat->{Tree};
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| 45 | }
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| 46 |
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| 47 | 1;
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| 48 | __END__
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| 49 |
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| 50 | =head1 NAME
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| 51 |
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| 52 | XML::Parser::Style::Tree
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| 53 |
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| 54 | =head1 SYNOPSIS
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| 55 |
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| 56 | use XML::Parser;
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| 57 | my $p = XML::Parser->new(Style => 'Tree');
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| 58 | my $tree = $p->parsefile('foo.xml');
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| 59 |
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| 60 | =head1 DESCRIPTION
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| 61 |
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| 62 | This module implements XML::Parser's Tree style parser.
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| 63 |
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| 64 | When parsing a document, C<parse()> will return a parse tree for the
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| 65 | document. Each node in the tree
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| 66 | takes the form of a tag, content pair. Text nodes are represented with
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| 67 | a pseudo-tag of "0" and the string that is their content. For elements,
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| 68 | the content is an array reference. The first item in the array is a
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| 69 | (possibly empty) hash reference containing attributes. The remainder of
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| 70 | the array is a sequence of tag-content pairs representing the content
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| 71 | of the element.
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| 72 |
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| 73 | So for example the result of parsing:
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| 74 |
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| 75 | <foo><head id="a">Hello <em>there</em></head><bar>Howdy<ref/></bar>do</foo>
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| 76 |
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| 77 | would be:
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| 78 | Tag Content
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| 79 | ==================================================================
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| 80 | [foo, [{}, head, [{id => "a"}, 0, "Hello ", em, [{}, 0, "there"]],
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| 81 | bar, [ {}, 0, "Howdy", ref, [{}]],
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| 82 | 0, "do"
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| 83 | ]
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| 84 | ]
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| 85 |
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| 86 | The root document "foo", has 3 children: a "head" element, a "bar"
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| 87 | element and the text "do". After the empty attribute hash, these are
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| 88 | represented in it's contents by 3 tag-content pairs.
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| 89 |
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| 90 | =cut
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