[24626] | 1 | # $Id: PerlSAX.pm 7909 2004-08-06 05:11:55Z mdewsnip $
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| 2 |
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| 3 | package XML::XPath::PerlSAX;
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| 4 | use XML::XPath::XMLParser;
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| 5 | use strict;
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| 6 |
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| 7 | sub new {
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| 8 | my $class = shift;
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| 9 | my %args = @_;
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| 10 | bless \%args, $class;
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| 11 | }
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| 12 |
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| 13 | sub parse {
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| 14 | my $self = shift;
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| 15 |
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| 16 | die "XML::XPath::PerlSAX: parser instance ($self) already parsing\n"
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| 17 | if (defined $self->{ParseOptions});
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| 18 |
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| 19 | # If there's one arg and it's an array ref, assume it's a node we're parsing
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| 20 | my $args;
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| 21 | if (@_ == 1 && ref($_[0]) =~ /^(text|comment|element|namespace|attribute|pi)$/) {
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| 22 | # warn "Parsing node\n";
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| 23 | my $node = shift;
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| 24 | # warn "PARSING: $node ", XML::XPath::XMLParser::as_string($node), "\n\n";
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| 25 | $args = { Source => { Node => $node } };
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| 26 | }
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| 27 | else {
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| 28 | $args = (@_ == 1) ? shift : { @_ };
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| 29 | }
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| 30 |
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| 31 | my $parse_options = { %$self, %$args };
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| 32 | $self->{ParseOptions} = $parse_options;
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| 33 |
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| 34 | # ensure that we have at least one source
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| 35 | if (!defined $parse_options->{Source} ||
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| 36 | !defined $parse_options->{Source}{Node}) {
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| 37 | die "XML::XPath::PerlSAX: no source defined for parse\n";
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| 38 | }
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| 39 |
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| 40 | # assign default Handler to any undefined handlers
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| 41 | if (defined $parse_options->{Handler}) {
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| 42 | $parse_options->{DocumentHandler} = $parse_options->{Handler}
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| 43 | if (!defined $parse_options->{DocumentHandler});
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| 44 | }
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| 45 |
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| 46 | # ensure that we have a DocumentHandler
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| 47 | if (!defined $parse_options->{DocumentHandler}) {
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| 48 | die "XML::XPath::PerlSAX: no Handler or DocumentHandler defined for parse\n";
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| 49 | }
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| 50 |
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| 51 | # cache DocumentHandler in self for callbacks
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| 52 | $self->{DocumentHandler} = $parse_options->{DocumentHandler};
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| 53 |
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| 54 | if ((ref($parse_options->{Source}{Node}) eq 'element') &&
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| 55 | !($parse_options->{Source}{Node}->[node_parent])) {
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| 56 | # Got root node
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| 57 | $self->{DocumentHandler}->start_document( { } );
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| 58 | $self->parse_node($parse_options->{Source}{Node});
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| 59 | return $self->{DocumentHandler}->end_document( { } );
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| 60 | }
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| 61 | else {
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| 62 | $self->parse_node($parse_options->{Source}{Node});
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| 63 | }
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| 64 |
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| 65 | # clean up parser instance
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| 66 | delete $self->{ParseOptions};
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| 67 | delete $self->{DocumentHandler};
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| 68 |
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| 69 | }
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| 70 |
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| 71 | sub parse_node {
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| 72 | my $self = shift;
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| 73 | my $node = shift;
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| 74 | # warn "parse_node $node\n";
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| 75 | if (ref($node) eq 'element' && $node->[node_parent]) {
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| 76 | # bundle up attributes
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| 77 | my @attribs;
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| 78 | foreach my $attr (@{$node->[node_attribs]}) {
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| 79 | if ($attr->[node_prefix]) {
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| 80 | push @attribs, $attr->[node_prefix] . ":" . $attr->[node_key];
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| 81 | }
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| 82 | else {
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| 83 | push @attribs, $attr->[node_key];
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| 84 | }
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| 85 | push @attribs, $attr->[node_value];
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| 86 | }
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| 87 |
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| 88 | $self->{DocumentHandler}->start_element(
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| 89 | { Name => $node->[node_name],
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| 90 | Attributes => \@attribs,
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| 91 | }
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| 92 | );
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| 93 | foreach my $kid (@{$node->[node_children]}) {
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| 94 | $self->parse_node($kid);
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| 95 | }
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| 96 | $self->{DocumentHandler}->end_element(
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| 97 | {
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| 98 | Name => $node->[node_name],
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| 99 | }
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| 100 | );
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| 101 | }
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| 102 | elsif (ref($node) eq 'text') {
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| 103 | $self->{DocumentHandler}->characters($node->[node_text]);
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| 104 | }
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| 105 | elsif (ref($node) eq 'comment') {
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| 106 | $self->{DocumentHandler}->comment($node->[node_comment]);
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| 107 | }
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| 108 | elsif (ref($node) eq 'pi') {
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| 109 | $self->{DocumentHandler}->processing_instruction(
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| 110 | {
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| 111 | Target => $node->[node_target],
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| 112 | Data => $node->[node_data]
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| 113 | }
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| 114 | );
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| 115 | }
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| 116 | elsif (ref($node) eq 'element') { # root node
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| 117 | # just do kids
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| 118 | foreach my $kid (@{$node->[node_children]}) {
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| 119 | $self->parse_node($kid);
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| 120 | }
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| 121 | }
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| 122 | else {
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| 123 | die "Unknown node type: '", ref($node), "' ", scalar(@$node), "\n";
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| 124 | }
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| 125 | }
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| 126 |
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| 127 | 1;
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| 128 |
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| 129 | __END__
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| 130 |
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| 131 | =head1 NAME
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| 132 |
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| 133 | XML::XPath::PerlSAX - A PerlSAX event generator for my wierd node structure
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| 134 |
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| 135 | =head1 SYNOPSIS
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| 136 |
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| 137 | use XML::XPath;
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| 138 | use XML::XPath::PerlSAX;
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| 139 | use XML::DOM::PerlSAX;
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| 140 |
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| 141 | my $xp = XML::XPath->new(filename => 'test.xhtml');
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| 142 | my $paras = $xp->find('/html/body/p');
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| 143 |
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| 144 | my $handler = XML::DOM::PerlSAX->new();
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| 145 | my $generator = XML::XPath::PerlSAX->new( Handler => $handler );
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| 146 |
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| 147 | foreach my $node ($paras->get_nodelist) {
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| 148 | my $domtree = $generator->parse($node);
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| 149 | # do something with $domtree
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| 150 | }
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| 151 |
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| 152 | =head1 DESCRIPTION
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| 153 |
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| 154 | This module generates PerlSAX events to pass to a PerlSAX handler such
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| 155 | as XML::DOM::PerlSAX. It operates specifically on my wierd tree format.
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| 156 |
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| 157 | Unfortunately SAX doesn't seem to cope with namespaces, so these are
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| 158 | lost completely. I believe SAX2 is doing namespaces.
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| 159 |
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| 160 | =head1 Other
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| 161 |
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| 162 | The XML::DOM::PerlSAX handler I tried was completely broken (didn't even
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| 163 | compile before I patched it a bit), so I don't know how correct this
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| 164 | is or how far it will work.
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| 165 |
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| 166 | This software may only be distributed as part of the XML::XPath package.
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