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# Copyright (c) 1999 Chang Liu
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# All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the same terms as Perl itself.
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package XML::Node;
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#use strict;
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#use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $VERSION);
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=head1 NAME
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XML::Node - Node-based XML parsing: an simplified interface to XML::Parser
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=head1 SYNOPSIS
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use XML::Node;
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$xml_node = new XML::Node;
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$xml_node->register( $nodetype, $callback_type => \&callback_function );
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$xml_node->register( $nodetype, $callback_type => \$variable );
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open(FOO, 'xmlgenerator |');
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$p3->parse(*FOO);
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close(FOO);
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$xml_node->parsefile( $xml_filename );
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=head1 DESCRIPTION
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If you are only interested in processing certain nodes in an XML file, this
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module can help you simplify your Perl scripts significantly.
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36
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The XML::Node module allows you to register callback functions or variables for
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any XML node. If you register a call back function, it will be called when
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the node of the type you specified are encountered. If you register a variable,
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the content of a XML node will be appended to that variable automatically.
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Subroutine register accepts both absolute and relative node registrations.
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Here is an example of absolute path registration:
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1. register(">TestCase>Name", "start" => \&handle_TestCase_Name_start);
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47
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Here are examples of single node name registration:
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2. register( "Name", "start" => \&handle_Name_start);
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3. register( "Name", "end" => \&handle_Name_end);
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4. register( "Name", "char" => \&handle_Name_char);
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53
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Here is an example of attribute registration:
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55
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5. register(">TestCase:Author", "attr" => \$testcase_author);
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Abosolute path trigger condition is recommended because a "Name" tage could appear in different
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places and stands for differe names.
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60
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Example:
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1
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2 Something
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3
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4 Something
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5
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69
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Statement 1 causes &handle_TestCase_Name_start to be called when parsing Line 2. Statements 2,3,4 cause the three handler subroutines to be called when parsing both Line 2 and Line 4.
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71
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This module uses XML::Parser.
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73
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=head1 EXAMPLE
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75
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Examples "test.pl" and "parse_orders.pl" come with this perl module.
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77
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=head1 SEE ALSO
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79
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XML::Parser
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81
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=head1 NOTE
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83
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When you register a variable, XML::Node appends strings found to that variable. So please be sure to clear that variable before it is used again.
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85
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=head1 AUTHORS
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87
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Chang Liu
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89
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=head1 LAST MODIFIED
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91
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$Date: 2001/12/10 11:38:28 $
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93
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=cut
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96
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1
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1
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use Exporter;
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2
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1
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85
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97
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$VERSION = "0.11";
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@ISA = ('Exporter');
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@EXPORT = qw (®ister &parse &parsefile);
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101
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102
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1
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use XML::Parser;
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0
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103
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use Carp;
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105
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106
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if ($ENV{DEBUG}) {
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print "DEBUG:XML::Node.pm VERSION $VERSION\n";
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}
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110
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my $instance = 0;
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my @selves = ();
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my $myinstance;
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114
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sub new{
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my $class = shift;
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my $self = {
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INSTANCE => $instance,
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START_HANDLERS => {},
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END_HANDLERS => {},
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CHAR_HANDLERS => {},
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ATTR_HANDLERS => {},
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CURRENT_TAG => "",
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CURRENT_PATH => "",
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};
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bless $self, $class;
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$selves[$instance++] = $self;
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return $self;
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}
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131
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sub register
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{
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$self = shift or croak "XML::Node --self is expected as THE first parameter \®ister.\n";
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my $node = shift or croak "XML::Node --a node path is expected as arg1 in \®ister.\n";
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my $type = shift or croak "XML::Node --node type is expected as arg2 in \®ister.\n";
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my $handler = shift or croak "XML::Node --a handler is expected as arg3 in \®ister.\n";
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if ($type eq "start") {
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$self->{START_HANDLERS}->{$node} = $handler;
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} elsif ($type eq "end") {
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$self->{END_HANDLERS}->{$node} = $handler;
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} elsif ($type eq "char") {
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$self->{CHAR_HANDLERS}->{$node} = $handler;
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} elsif ($type eq "attr") {
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$self->{ATTR_HANDLERS}->{$node} = $handler;
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} else {
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croak "XML::Node --unknown handler type $type for node $node\n";
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}
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}
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150
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151
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sub parsefile
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{
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$self = shift or croak "XML::Node --self is expected as THE first parameter \®ister.\n";
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my $xml_file = shift or croak "XML::Node --an XML filename is expected in \&parse.\n";
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156
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$myinstance = $self->{INSTANCE};
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carp "XML::Node - invoking parser [$myinstance]" if $ENV{DEBUG};
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159
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my $my_handlers = qq {
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sub handle_start_$myinstance
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{
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&handle_start($myinstance, \@_);
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}
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sub handle_end_$myinstance
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{
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&handle_end($myinstance, \@_);
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}
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sub handle_char_$myinstance
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{
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&handle_char($myinstance, \@_);
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}
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\$XML::Node::parser = new XML::Parser(Handlers => { Start => \\& handle_start_$myinstance,
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End => \\& handle_end_$myinstance,
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Char => \\& handle_char_$myinstance } );
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176
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};
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#carp "[[[[[[[[[[[[[[[[$my_handlers]]]]]]]]]]]]]]";
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eval ($my_handlers);
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$parser->parsefile("$xml_file");
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}
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182
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sub parse
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{
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$self = shift or croak "XML::Node --self is expected as THE first parameter \®ister.\n";
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186
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$myinstance = $self->{INSTANCE};
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carp "XML::Node - invoking parser [$myinstance]" if $ENV{DEBUG};
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189
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my $my_handlers = qq {
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sub handle_start_$myinstance
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{
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&handle_start($myinstance, \@_);
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}
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sub handle_end_$myinstance
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{
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&handle_end($myinstance, \@_);
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}
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sub handle_char_$myinstance
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{
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&handle_char($myinstance, \@_);
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}
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202
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\$XML::Node::parser = new XML::Parser(Handlers => { Start => \\& handle_start_$myinstance,
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203
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End => \\& handle_end_$myinstance,
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Char => \\& handle_char_$myinstance } );
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206
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};
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#carp "[[[[[[[[[[[[[[[[$my_handlers]]]]]]]]]]]]]]";
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208
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eval ($my_handlers);
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$parser->parse(shift);
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}
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212
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sub handle_start
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213
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{
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my $myinstance = shift;
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215
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my $p = shift;
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216
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my $element = shift;
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217
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218
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219
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my $current_path = $selves[$myinstance]->{CURRENT_PATH} =
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220
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$selves[$myinstance]->{CURRENT_PATH} . ">" . $element;
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221
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my $current_tag = $selves[$myinstance]->{CURRENT_TAG} = $element;
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222
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223
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my $attr;
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224
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my $value;
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225
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226
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# carp("handle_start called [$myinstance] [$element] [$current_path]\n");
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227
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228
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while (defined ($attr = shift ) ) {
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229
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if (! defined ($value = shift)) {
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230
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croak ("value for attribute [$attr] of element [$element] is not returned by XML::Parser\n");
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231
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}
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232
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# carp("Attribute [$attr] of element [$element] found with value [$value] attr_path:[$attr_path]\n");
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233
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|
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my @array = split(/>/, $current_path);
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234
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|
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my $current_relative_path = "$current_tag:$attr";
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235
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my $i;
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236
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if ($selves[$myinstance]->{ATTR_HANDLERS}->{$current_relative_path}) {
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237
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handle($p, $value, $selves[$myinstance]->{ATTR_HANDLERS}->{$current_relative_path});
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238
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}
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239
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for ($i=$#array-1;$i>=1;$i--)
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240
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{ # call all relative paths
|
241
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$current_relative_path = $array[$i] . ">" . $current_relative_path;
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242
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|
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if ($selves[$myinstance]->{ATTR_HANDLERS}->{$current_relative_path}) {
|
243
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handle($p, $value, $selves[$myinstance]->{ATTR_HANDLERS}->{$current_relative_path});
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244
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}
|
245
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}
|
246
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|
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my $attr_path = "$current_path:$attr";
|
247
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|
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if ($selves[$myinstance]->{ATTR_HANDLERS}->{$attr_path}) {
|
248
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|
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handle($p, $value, $selves[$myinstance]->{ATTR_HANDLERS}->{$attr_path});
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249
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}
|
250
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}
|
251
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252
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|
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my @array = split(/>/, $current_path);
|
253
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|
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my $current_relative_path = $current_tag;
|
254
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|
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my $i;
|
255
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|
256
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|
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if ($selves[$myinstance]->{START_HANDLERS}->{$current_tag}) {
|
257
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|
|
handle($p, $element, $selves[$myinstance]->{START_HANDLERS}->{$current_tag});
|
258
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|
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}
|
259
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|
|
#carp("--Begin loop\n");
|
260
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|
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for ($i=$#array-1;$i>=1;$i--)
|
261
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|
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{ # call all relative paths
|
262
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|
|
$current_relative_path = $array[$i] . ">" . $current_relative_path;
|
263
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|
|
#carp("Array size is $#array, \$i is $i, current_relative_path is $current_relative_path\n");
|
264
|
|
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|
|
|
|
if ($selves[$myinstance]->{START_HANDLERS}->{$current_relative_path}) {
|
265
|
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|
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|
|
handle($p, $element, $selves[$myinstance]->{START_HANDLERS}->{$current_relative_path});
|
266
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|
|
}
|
267
|
|
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|
|
}
|
268
|
|
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|
|
#carp("--End loop\n");
|
269
|
|
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|
|
|
|
if ($selves[$myinstance]->{START_HANDLERS}->{$current_path}) {
|
270
|
|
|
|
|
|
|
handle($p, $element, $selves[$myinstance]->{START_HANDLERS}->{$current_path});
|
271
|
|
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|
|
|
|
}
|
272
|
|
|
|
|
|
|
}
|
273
|
|
|
|
|
|
|
|
274
|
|
|
|
|
|
|
sub handle_end
|
275
|
|
|
|
|
|
|
{
|
276
|
|
|
|
|
|
|
my $myinstance = shift;
|
277
|
|
|
|
|
|
|
my $p = shift;
|
278
|
|
|
|
|
|
|
my $element = shift;
|
279
|
|
|
|
|
|
|
my $current_path = $selves[$myinstance]->{CURRENT_PATH};
|
280
|
|
|
|
|
|
|
|
281
|
|
|
|
|
|
|
# carp("handle_end called [$myinstance] [$element]\n");
|
282
|
|
|
|
|
|
|
|
283
|
|
|
|
|
|
|
$selves[$myinstance]->{CURRENT_TAG} = $element;
|
284
|
|
|
|
|
|
|
|
285
|
|
|
|
|
|
|
my @array = split(/>/, $current_path);
|
286
|
|
|
|
|
|
|
my $current_relative_path = $element;
|
287
|
|
|
|
|
|
|
my $i;
|
288
|
|
|
|
|
|
|
|
289
|
|
|
|
|
|
|
if ($selves[$myinstance]->{END_HANDLERS}->{$selves[$myinstance]->{CURRENT_TAG}}) {
|
290
|
|
|
|
|
|
|
handle($p, $element, $selves[$myinstance]->{END_HANDLERS}->{$selves[$myinstance]->{CURRENT_TAG}});
|
291
|
|
|
|
|
|
|
}
|
292
|
|
|
|
|
|
|
for ($i=$#array-1;$i>=1;$i--)
|
293
|
|
|
|
|
|
|
{ # call all relative paths
|
294
|
|
|
|
|
|
|
$current_relative_path = $array[$i] . ">" . $current_relative_path;
|
295
|
|
|
|
|
|
|
#carp("Array size is $#array, \$i is $i, current_relative_path is $current_relative_path\n");
|
296
|
|
|
|
|
|
|
if ($selves[$myinstance]->{END_HANDLERS}->{$current_relative_path}) {
|
297
|
|
|
|
|
|
|
handle($p, $element, $selves[$myinstance]->{END_HANDLERS}->{$current_relative_path});
|
298
|
|
|
|
|
|
|
}
|
299
|
|
|
|
|
|
|
}
|
300
|
|
|
|
|
|
|
if ($selves[$myinstance]->{END_HANDLERS}->{$selves[$myinstance]->{CURRENT_PATH}}) {
|
301
|
|
|
|
|
|
|
handle($p, $element, $selves[$myinstance]->{END_HANDLERS}->{$selves[$myinstance]->{CURRENT_PATH}});
|
302
|
|
|
|
|
|
|
}
|
303
|
|
|
|
|
|
|
|
304
|
|
|
|
|
|
|
$selves[$myinstance]->{CURRENT_PATH} =~ /(.*)>/;
|
305
|
|
|
|
|
|
|
$selves[$myinstance]->{CURRENT_PATH} = $1;
|
306
|
|
|
|
|
|
|
$selves[$myinstance]->{CURRENT_TAG} = $';
|
307
|
|
|
|
|
|
|
if ($element ne $selves[$myinstance]->{CURRENT_TAG}) {
|
308
|
|
|
|
|
|
|
carp "start-tag <$selves[$myinstance]->{CURRENT_TAG}> doesn't match end-tag <$element>. Is this XML file well-formed?\n";
|
309
|
|
|
|
|
|
|
}
|
310
|
|
|
|
|
|
|
$selves[$myinstance]->{CURRENT_PATH} =~ /(.*)>/;
|
311
|
|
|
|
|
|
|
$selves[$myinstance]->{CURRENT_TAG} = $';
|
312
|
|
|
|
|
|
|
}
|
313
|
|
|
|
|
|
|
|
314
|
|
|
|
|
|
|
sub handle_char
|
315
|
|
|
|
|
|
|
{
|
316
|
|
|
|
|
|
|
my $myinstance = shift;
|
317
|
|
|
|
|
|
|
my $p = shift;
|
318
|
|
|
|
|
|
|
my $element = shift;
|
319
|
|
|
|
|
|
|
my $current_path = $selves[$myinstance]->{CURRENT_PATH};
|
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
# carp("handle_char called [$myinstance] [$element]\n");
|
322
|
|
|
|
|
|
|
|
323
|
|
|
|
|
|
|
my @array = split(/>/, $current_path);
|
324
|
|
|
|
|
|
|
my $current_relative_path = $element;
|
325
|
|
|
|
|
|
|
my $i;
|
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
if ($selves[$myinstance]->{CHAR_HANDLERS}->{$selves[$myinstance]->{CURRENT_TAG}}) {
|
328
|
|
|
|
|
|
|
handle($p, $element, $selves[$myinstance]->{CHAR_HANDLERS}->{$selves[$myinstance]->{CURRENT_TAG}});
|
329
|
|
|
|
|
|
|
}
|
330
|
|
|
|
|
|
|
for ($i=$#array-1;$i>=1;$i--)
|
331
|
|
|
|
|
|
|
{ # call all relative paths
|
332
|
|
|
|
|
|
|
$current_relative_path = $array[$i] . ">" . $current_relative_path;
|
333
|
|
|
|
|
|
|
if ($selves[$myinstance]->{CHAR_HANDLERS}->{$current_relative_path}) {
|
334
|
|
|
|
|
|
|
handle($p, $element, $selves[$myinstance]->{CHAR_HANDLERS}->{$current_relative_path});
|
335
|
|
|
|
|
|
|
}
|
336
|
|
|
|
|
|
|
}
|
337
|
|
|
|
|
|
|
if ($selves[$myinstance]->{CHAR_HANDLERS}->{$selves[$myinstance]->{CURRENT_PATH}}) {
|
338
|
|
|
|
|
|
|
handle($p, $element, $selves[$myinstance]->{CHAR_HANDLERS}->{$selves[$myinstance]->{CURRENT_PATH}});
|
339
|
|
|
|
|
|
|
}
|
340
|
|
|
|
|
|
|
}
|
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
sub handle
|
343
|
|
|
|
|
|
|
{
|
344
|
|
|
|
|
|
|
my $p = shift;
|
345
|
|
|
|
|
|
|
my $element = shift;
|
346
|
|
|
|
|
|
|
my $handler = shift;
|
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
my $handler_type = ref($handler);
|
349
|
|
|
|
|
|
|
if ($handler_type eq "CODE") {
|
350
|
|
|
|
|
|
|
&$handler($p,$element); # call the handler function
|
351
|
|
|
|
|
|
|
} elsif ($handler_type eq "SCALAR") {
|
352
|
|
|
|
|
|
|
# chomp($element);
|
353
|
|
|
|
|
|
|
# $element =~ /^(\s*)/;
|
354
|
|
|
|
|
|
|
# $element = $';
|
355
|
|
|
|
|
|
|
# $element =~ /(\s*)$/;
|
356
|
|
|
|
|
|
|
# $element = $`;
|
357
|
|
|
|
|
|
|
if (! defined $$handler) {
|
358
|
|
|
|
|
|
|
$$handler = "";
|
359
|
|
|
|
|
|
|
#carp ("XML::Node - SCALAR handler undefined when processing [$element]");
|
360
|
|
|
|
|
|
|
}
|
361
|
|
|
|
|
|
|
$$handler = $$handler . $element; #append the content to the handler variable
|
362
|
|
|
|
|
|
|
} else {
|
363
|
|
|
|
|
|
|
carp "XML::Node -unknown handler type [$handler_type]\n";
|
364
|
|
|
|
|
|
|
exit;
|
365
|
|
|
|
|
|
|
}
|
366
|
|
|
|
|
|
|
}
|
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
|
369
|
|
|
|
|
|
|
1;
|