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MKDoc::XML::Token.3pm

NAME

MKDoc::XML::Token - XML Token Object

SYNOPSIS

   my $tokens = MKDoc::XML::Tokenizer->process_data ($some_xml);
   foreach my $token (@{$tokens})
   {
       print "'" . $token->as_string() . "' is text\n" if (defined $token->text());
       print "'" . $token->as_string() . "' is a self closing tag\n" if (defined $token->tag_self_close());
       print "'" . $token->as_string() . "' is an opening tag\n" if (defined $token->tag_open());
       print "'" . $token->as_string() . "' is a closing tag\n" if (defined $token->tag_close());
       print "'" . $token->as_string() . "' is a processing instruction\n" if (defined $token->pi());
       print "'" . $token->as_string() . "' is a declaration\n" if (defined $token->declaration());
       print "'" . $token->as_string() . "' is a comment\n" if (defined $token->comment());
       print "'" . $token->as_string() . "' is a tag\n" if (defined $token->tag());
       print "'" . $token->as_string() . "' is a pseudo-tag (NOT text and NOT tag)\n" if (defined $token->pseudotag());
       print "'" . $token->as_string() . "' is a leaf token (NOT opening tag)\n" if (defined $token->leaf());
   }
 
 

SUMMARY

MKDoc::XML::Token is an object representing an XML token produced by MKDoc::XML::Tokenizer.

It has a set of methods to identify the type of token it is, as well as to help building a parsed tree as in MKDoc::XML::TreeBuilder.

API

my $token = new MKDoc::XML::Token ($string_token);

Constructs a new MKDoc::XML::Token object.

my $string_token = $token->as_string();

Returns the string representation of this token so that:

   MKDoc::XML::Token->new ($token)->as_string eq $token
 
 

is a tautology.

my $node = $token->leaf();

If this token is not an opening tag, this method will return its corresponding node structure as returned by $token->text(), $token->tag_self_close(), etc.

Returns undef otherwise.

my $node = $token->pseudotag();

If this token is a comment, declaration or processing instruction, this method will return $token->tag_comment(), $token_declaration() or $token->pi() resp.

Returns undef otherwise.

my $node = $token->tag();

If this token is an opening, closing, or self closing tag, this method will return $token->tag_open(), $token->tag_close() or $token->tag_self_close() resp.

Returns undef otherwise.

my $node = $token->comment();

If this token object represents a declaration, the following structure is returned:

   # this is <!-- I like Pie. Pie is good -->
   {
       _tag   => '~comment',
       text   => ' I like Pie. Pie is good ',
   }
 
 

Returns undef otherwise.

my $node = $token->declaration();

If this token object represents a declaration, the following structure is returned:

   # this is <!DOCTYPE foo>
   {
       _tag   => '~declaration',
       text   => 'DOCTYPE foo',
   }
 
 

Returns undef otherwise.

my $node = $token->pi();

If this token object represents a processing instruction, the following structure is returned:

   # this is <?xml version="1.0" charset="UTF-8"?>
   {
       _tag   => '~pi',
       text   => 'xml version="1.0" charset="UTF-8"',
   }
 
 

Returns undef otherwise.

my $node = $token->tag_open();

If this token object represents an opening tag, the following structure is returned:

   # this is <aTag foo="bar" baz="buz">
   {
       _tag   => 'aTag',
       _open  => 1,
       _close => 0,
       foo    => 'bar',
       baz    => 'buz',
   }
 
 

Returns undef otherwise.

my $node = $token->tag_close();

If this token object represents a closing tag, the following structure is returned:

   # this is </aTag>
   {
       _tag   => 'aTag',
       _open  => 0,
       _close => 1,
   }
 
 

Returns undef otherwise.

my $node = $token->tag_self_close();

If this token object represents a self-closing tag, the following structure is returned:

   # this is <aTag foo="bar" baz="buz" />
   {
       _tag   => 'aTag',
       _open  => 1,
       _close => 1,
       foo    => 'bar',
       baz    => 'buz',
   }
 
 

Returns undef otherwise.

my $node = $token->text();

If this token object represents a piece of text, then this text is returned. Returns undef otherwise. TRAP! $token->text() returns a false value if this text happens to be '0' or ''. So really you should use:

   if (defined $token->text()) {
     ... do stuff...
   }
 
 

NOTES

MKDoc::XML::Token works with MKDoc::XML::Tokenizer, which can be used when building a full tree is not necessary. If you need to build a tree, look at MKDoc::XML::TreeBuilder.

AUTHOR

Copyright 2003 - MKDoc Holdings Ltd.

Author: Jean-Michel Hiver

This module is free software and is distributed under the same license as Perl itself. Use it at your own risk.

SEE ALSO

MKDoc::XML::Tokenizer MKDoc::XML::TreeBuilder