use HTML::TokeParser::Simple; my $p = HTML::TokeParser::Simple->new( $somefile ); while ( my $token = $p->get_token ) { # This prints all text in an HTML doc (i.e., it strips the HTML) next unless $token->is_text; print $token->as_is; }
["S", $tag, $attr, $attrseq, $text] ["E", $tag, $text] ["T", $text, $is_data] ["C", $text] ["D", $text] ["PI", $token0, $text]
To simplify this, "HTML::TokeParser::Simple" allows the user ask more intuitive (read: more self-documenting) questions about the tokens returned.
You can also rebuild some tags on the fly. Frequently, the attributes associated with start tags need to be altered, added to, or deleted. This functionality is built in.
Since this is a subclass of "HTML::TokeParser", all "HTML::TokeParser" methods are available. To truly appreciate the power of this module, please read the documentation for "HTML::TokeParser" and "HTML::Parser".
my $parser = HTML::TokeParser::Simple->new($filename); # or my $parser = HTML::TokeParser::Simple->new($filehandle); # or my $parser = HTML::TokeParser::Simple->new(\$html_string);
my $parser = HTML::TokeParser::Simple->new(file => $filename); # or my $parser = HTML::TokeParser::Simple->new(handle => $filehandle); # or my $parser = HTML::TokeParser::Simple->new(string => $html_string);
Note that you do not have to provide a reference for the string if using the string constructor.
As a convenience, you can also attempt to fetch the HTML directly from a URL.
my $parser = HTML::TokeParser::Simple->new(url => 'http://some.url');
This method relies on "LWP::Simple". If this module is not found or the page cannot be fetched, the constructor will "croak()".
This is useful when you're trying to debug where you are in a document.
warn $parser->peek(3); # show the next 3 tokens
Use this to determine if you have any tag. An optional ``tag type'' may be passed. This will allow you to match if it's a particular tag. The supplied tag is case-insensitive.
if ( $token->is_tag ) { ... }
Optionally, you may pass a regular expression as an argument.
Use this to determine if you have a start tag. An optional ``tag type'' may be passed. This will allow you to match if it's a particular start tag. The supplied tag is case-insensitive.
if ( $token->is_start_tag ) { ... } if ( $token->is_start_tag( 'font' ) ) { ... }
Optionally, you may pass a regular expression as an argument. To match all header (h1, h2, ... h6) tags:
if ( $token->is_start_tag( qr/^h[123456]$/ ) ) { ... }
Use this to determine if you have an end tag. An optional ``tag type'' may be passed. This will allow you to match if it's a particular end tag. The supplied tag is case-insensitive.
When testing for an end tag, the forward slash on the tag is optional.
while ( $token = $p->get_token ) { if ( $token->is_end_tag( 'form' ) ) { ... } }
Or:
while ( $token = $p->get_token ) { if ( $token->is_end_tag( '/form' ) ) { ... } }
Optionally, you may pass a regular expression as an argument.
Use this to determine if you have text. Note that this is not to be confused with the "return_text" (deprecated) method described below! "is_text" will identify text that the user typically sees display in the Web browser.
Are you still reading this? Nobody reads POD. Don't you know you're supposed to go to CLPM, ask a question that's answered in the POD and get flamed? It's a rite of passage.
Really.
"is_comment" is used to identify comments. See the HTML::Parser documentation for more information about comments. There's more than you might think.
This will match the DTD at the top of your HTML. (You do use DTD's, don't you?)
Process Instructions are from XML. This is very handy if you need to parse out PHP and similar things with a parser.
Currently, there appear to be some problems with process instructions. You can override "HTML::TokeParser::Simple::Token::ProcessInstruction" if you need to.
This is a shorthand for "is_process_instruction()".
Do you have a start tag or end tag? This will return the type (lower case). Note that this is not the same as the "get_tag()" method on the actual parser object.
If you have a start tag, this will return a hash ref with the attribute names as keys and the values as the values.
If you pass in an attribute name, it will return the value for just that attribute.
Returns false if the token is not a start tag.
For a start tag, this is an array reference with the sequence of the attributes, if any.
Returns false if the token is not a start tag.
This method has been heavily deprecated (for a couple of years) in favor of "as_is". Programmers were getting confused over the difference between "is_text", "return_text", and some parser methods such as "HTML::TokeParser::get_text" and friends.
Using this method still succeeds, but will now carp and will be removed in the next major release of this module.
This is the exact text of whatever the token is representing.
For processing instructions, this will return the token found immediately after the opening tag. Example: For <?php, ``php'' will be the start of the returned string.
Note that process instruction handling appears to be incomplete in "HTML::TokeParser".
Returns false if the token is not a process instruction.
Self-closing tags (e.g. <hr />) are also handled correctly. Some older browsers require a space prior to the final slash in a self-closed tag. If such a space is detected in the original HTML, it will be preserved.
Calling a mutator on an token type that does not support that property is a no-op. For example:
if ($token->is_comment) { $token->set_attr(foo => 'bar'); # does nothing }
This method attempts to delete the attribute specified. It will silently fail if called on anything other than a start tag. The argument is case-insensitive, but must otherwise be an exact match of the attribute you are attempting to delete. If the attribute is not found, the method will return without changing the tag.
# <body bgcolor="#FFFFFF"> $token->delete_attr('bgcolor'); print $token->as_is; # <body>
After this method is called, if successful, the "as_is()", "get_attr()" and "get_attrseq()" methods will all return updated results.
This method will set the value of an attribute. If the attribute is not found, then "get_attrseq()" will have the new attribute listed at the end.
# <p> $token->set_attr(class => 'some_class'); print $token->as_is; # <p class="some_class"> # <body bgcolor="#FFFFFF"> $token->set_attr('bgcolor','red'); print $token->as_is; # <body bgcolor="red">
After this method is called, if successful, the "as_is()", "get_attr()" and "get_attrseq()" methods will all return updated results.
Under the premise that "set_" methods should accept what their corresponding "get_" methods emit, the following works:
$tag->set_attr($tag->get_attr);
Theoretically that's a no-op and for purposes of rendering HTML, it should be. However, internally this calls "$tag->rewrite_tag", so see that method to understand how this may affect you.
Of course, this is useless if you want to actually change the attributes, so you can do this:
my $attrs = { class => 'headline', valign => 'top' }; $token->set_attr($attrs) if $token->is_start_tag('td') && $token->get_attr('class') eq 'stories';
This method rewrites the tag. The tag name and the name of all attributes will be lower-cased. Values that are not quoted with double quotes will be. This may be called on both start or end tags. Note that both "set_attr()" and "delete_attr()" call this method prior to returning.
If called on a token that is not a tag, it simply returns. Regardless of how it is called, it returns the token.
# <body alink=#0000ff BGCOLOR=#ffffff class='none'> $token->rewrite_tag; print $token->as_is; # <body alink="#0000ff" bgcolor="#ffffff" class="none">
A quick cleanup of sloppy HTML is now the following:
my $parser = HTML::TokeParser::Simple->new( string => $ugly_html ); while (my $token = $parser->get_token) { $token->rewrite_tag; print $token->as_is; }
use strict; use HTML::TokeParser::Simple; my @html_docs = glob( "*.html" ); open PHB, "> phbreport.txt" or die "Cannot open phbreport for writing: $!"; foreach my $doc ( @html_docs ) { print "Processing $doc\n"; my $p = HTML::TokeParser::Simple->new( file => $doc ); while ( my $token = $p->get_token ) { next unless $token->is_comment; print PHB $token->as_is, "\n"; } } close PHB;
use strict; use HTML::TokeParser::Simple; my $new_folder = 'no_comment/'; my @html_docs = glob( "*.html" ); foreach my $doc ( @html_docs ) { print "Processing $doc\n"; my $new_file = "$new_folder$doc"; open PHB, "> $new_file" or die "Cannot open $new_file for writing: $!"; my $p = HTML::TokeParser::Simple->new( $file => doc ); while ( my $token = $p->get_token ) { next if $token->is_comment; print PHB $token->as_is; } close PHB; }
use strict; use HTML::TokeParser::Simple; my $new_folder = 'new_html/'; my @html_docs = glob( "*.html" ); foreach my $doc ( @html_docs ) { print "Processing $doc\n"; my $new_file = "$new_folder$doc"; open FILE, "> $new_file" or die "Cannot open $new_file for writing: $!"; my $p = HTML::TokeParser::Simple->new( file => $doc ); while ( my $token = $p->get_token ) { if ( $token->is_start_tag('form') ) { my $action = $token->get_attr(action); $action =~ s/www\.foo\.com/www.bar.com/; $token->set_attr('action', $action); } print FILE $token->as_is; } close FILE; }
Use of $HTML::Parser::VERSION which is less than 3.25 may result in incorrect behavior as older versions do not always handle XHTML correctly. It is the programmer's responsibility to verify that the behavior of this code matches the programmer's needs.
Note that "HTML::Parser" processes text in 512 byte chunks. This sometimes will cause strange behavior and cause text to be broken into more than one token. You can suppress this behavior with the following command:
$p->unbroken_text( [$bool] );
See the "HTML::Parser" documentation and http://www.perlmonks.org/index.pl?node_id=230667 for more information.
Address bug reports and comments to: <eop_divo_sitruc@yahoo.com>. When sending bug reports, please provide the version of "HTML::Parser", "HTML::TokeParser", "HTML::TokeParser::Simple", the version of Perl, and the version of the operating system you are using.
Reverse the name to email the author.
HTML::TokeParser::Simple::Token::Tag
HTML::TokeParser::Simple::Token::Text
HTML::TokeParser::Simple::Token::Comment
HTML::TokeParser::Simple::Token::Declaration
HTML::TokeParser::Simple::Token::ProcessInstruction
Reverse the name to email the author.