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package Syntax::Highlight::HTML; |
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use strict; |
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use HTML::Parser; |
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{ no strict; |
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$VERSION = '0.04'; |
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@ISA = qw(HTML::Parser); |
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} |
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=head1 NAME |
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Syntax::Highlight::HTML - Highlight HTML syntax |
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=head1 VERSION |
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Version 0.04 |
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=cut |
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my %classes = ( |
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declaration => 'h-decl', |
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process => 'h-pi', |
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comment => 'h-com', |
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angle_bracket => 'h-ab', |
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tag_name => 'h-tag', |
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attr_name => 'h-attr', |
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attr_value => 'h-attv', |
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entity => 'h-ent', |
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line_number => 'h-lno', |
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); |
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my %defaults = ( |
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pre => 1, |
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nnn => 0, |
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); |
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=head1 SYNOPSIS |
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use Syntax::Highlight::HTML; |
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my $highlighter = new Syntax::Highlight::HTML; |
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$output = $highlighter->parse($html); |
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If C<$html> contains the following HTML fragment: |
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<!-- a description list --> |
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<dl compact="compact"> |
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<dt>some word</dt> |
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<dd>the description of the word. Plus some <a href="/definitions/other_word" |
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>reference</a> towards another definition. </dd> |
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</dl> |
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then the resulting HTML contained in C<$output> will render like this: |
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=begin html |
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<style type="text/css"> |
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<!-- |
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.h-decl { color: #336699; font-style: italic; } /* doctype declaration */ |
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.h-pi { color: #336699; } /* process instruction */ |
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.h-com { color: #338833; font-style: italic; } /* comment */ |
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.h-ab { color: #000000; font-weight: bold; } /* angles as tag delim. */ |
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.h-tag { color: #993399; font-weight: bold; } /* tag name */ |
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.h-attr { color: #000000; font-weight: bold; } /* attribute name */ |
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.h-attv { color: #333399; } /* attribute value */ |
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.h-ent { color: #cc3333; } /* entity */ |
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.h-lno { color: #aaaaaa; background: #f7f7f7;} /* line numbers */ |
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--> |
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</style> |
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<pre> |
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<span class="h-com"><!-- a description list --></span> |
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<span class="h-ab"><</span><span class="h-tag">dl</span> <span class="h-attr">compact</span>=<span class="h-attv">"compact</span>"<span class="h-ab">></span> |
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<span class="h-ab"><</span><span class="h-tag">dt</span><span class="h-ab">></span>some word<span class="h-ab"></</span><span class="h-tag">dt</span><span class="h-ab">></span> |
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<span class="h-ab"><</span><span class="h-tag">dd</span><span class="h-ab">></span>the description of the word. Plus some <span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/definitions/other_word</span>" |
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<span class="h-ab">></span>reference<span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span> towards another definition. <span class="h-ab"></</span><span class="h-tag">dd</span><span class="h-ab">></span> |
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<span class="h-ab"></</span><span class="h-tag">dl</span><span class="h-ab">></span> |
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</pre> |
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=end html |
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=head1 DESCRIPTION |
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This module is designed to take raw HTML input and highlight it (using a CSS |
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stylesheet, see L<"Notes"> for the classes). The returned HTML code is ready |
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for inclusion in a web page. |
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It is intented to be used as an highlighting filter, and as such does not reformat |
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or reindent the original HTML code. |
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=head1 METHODS |
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=over 4 |
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=item new() |
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The constructor. Returns a C<Syntax::Highlight::HTML> object, which derives from |
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C<HTML::Parser>. As such, any C<HTML::parser> method can be called on this object |
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(that is, expect for C<parse()> which is overloaded here). |
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B<Options> |
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=over 4 |
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=item * |
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C<nnn> - Activate line numbering. Default value: 0 (disabled). |
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=item * |
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C<pre> - Surround result by C<< <pre>...</pre> >> tags. Default value: 1 (enabled). |
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=back |
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B<Example> |
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To avoid surrounding the result by the C<< <pre>...</pre> >> tags: |
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my $highlighter = Syntax::Highlight::HTML->new(pre => 0); |
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=cut |
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sub new { |
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my $self = __PACKAGE__->SUPER::new( |
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api_version => 3, |
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case_sensitive => 1, |
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attr_encoded => 1, |
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declaration_h => [ \&_highlight_tag, 'self, event, tagname, attr, text' ], |
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process_h => [ \&_highlight_tag, 'self, event, tagname, attr, text' ], |
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comment_h => [ \&_highlight_tag, 'self, event, tagname, attr, text' ], |
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start_h => [ \&_highlight_tag, 'self, event, tagname, attr, text' ], |
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end_h => [ \&_highlight_tag, 'self, event, tagname, attr, text' ], |
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text_h => [ \&_highlight_text, 'self, text' ], |
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default_h => [ \&_highlight_text, 'self, text' ], |
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); |
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my $class = ref $_[0] || $_[0]; shift; |
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bless $self, $class; |
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$self->{options} = { %defaults }; |
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my %args = @_; |
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for my $arg (keys %defaults) { |
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$self->{options}{$arg} = $args{$arg} if defined $args{$arg} |
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} |
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$self->{output} = ''; |
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return $self |
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} |
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=item parse() |
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Parse the HTML code given in argument and returns the highlighted HTML code, |
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ready for inclusion in a web page. |
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B<Example> |
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$highlighter->parse("<p>Hello, world.</p>"); |
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=cut |
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sub parse { |
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my $self = shift; |
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$self->{output} = ''; |
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$self->SUPER::parse($_[0]); |
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$self->eof; |
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if($self->{options}{nnn}) { |
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my $i = 1; |
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$self->{output} =~ s|^|<span class="$classes{line_number}">@{[sprintf '%3d', $i++]}</span> |gm; |
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} |
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$self->{output} = "<pre>\n" . $self->{output} . "</pre>\n" if $self->{options}{pre}; |
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return $self->{output} |
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} |
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=back |
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=head2 Internals Methods |
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The following methods are for internal use only. |
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194
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=over 4 |
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196
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=item _highlight_tag() |
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C<HTML::Parser> tags handler: highlights a tag. |
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=cut |
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202
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sub _highlight_tag { |
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my $self = shift; |
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my $event = shift; |
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my $tagname = shift; |
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my $attr = shift; |
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$_[0] =~ s|&([^;]+;)|<span class="$classes{entity}">&$1</span>|g; |
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if($event eq 'declaration' or $event eq 'process' or $event eq 'comment') { |
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$_[0] =~ s/</</g; |
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$_[0] =~ s/>/>/g; |
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$self->{output} .= qq|<span class="$classes{$event}">| . $_[0] . '</span>' |
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215
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} else { |
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$_[0] =~ s|^<$tagname|<<span class="$classes{tag_name}">$tagname</span>|; |
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} |
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} |
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=back |
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=head1 NOTES |
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The resulting HTML uses CSS to colourize the syntax. Here are the classes |
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that you can define in your stylesheet. |
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=over 4 |
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=item * |
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C<.h-decl> - for a markup declaration; in a HTML document, the only |
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markup declaration is the C<DOCTYPE>, like: |
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C<< <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> >> |
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C<.h-pi> - for a process instruction like C<< <?html ...> >> |
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or C<< <?xml ...?> >> |
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=item * |
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C<.h-com> - for a comment, C<< <!-- ... --> >> |
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C<.h-ab> - for the characters C<< '<' >> and C<< '>' >> as tag delimiters |
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C<.h-ent> - for any entities: C<é> C<«> |
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C<.h-lno> - for the line numbers |
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=back |
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An example stylesheet can be found in F<eg/html-syntax.css>. |
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=head1 EXAMPLE |
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Here is an example of generated HTML output. It was generated with the |
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script F<eg/highlight.pl>. |
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The following HTML fragment (which is the beginning of |
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L<http://search.cpan.org/~saper/>) |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
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<html> |
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<head> |
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> |
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<link rel="stylesheet" href="/s/style.css" type="text/css"> |
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<title>search.cpan.org: Sébastien Aperghis-Tramoni</title> |
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</head> |
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<body id="cpansearch"> |
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<center><div class="logo"><a href="/"><img src="/s/img/cpan_banner.png" alt="CPAN"></a></div></center> |
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<div class="menubar"> |
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<a href="/">Home</a> |
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· <a href="/author/">Authors</a> |
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· <a href="/recent">Recent</a> |
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· <a href="/news">News</a> |
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· <a href="/mirror">Mirrors</a> |
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· <a href="/faq.html">FAQ</a> |
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· <a href="/feedback">Feedback</a> |
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</div> |
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<form method="get" action="/search" name="f" class="searchbox"> |
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<input type="text" name="query" value="" size="35"> |
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<br>in <select name="mode"> |
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<option value="all">All</option> |
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<option value="module" >Modules</option> |
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<option value="dist" >Distributions</option> |
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<option value="author" >Authors</option> |
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</select> <input type="submit" value="CPAN Search"> |
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</form> |
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will be rendered like this (using the CSS stylesheet F<eg/html-syntax.css>): |
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=begin html |
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<pre> |
336
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<span class="h-lno"> 1</span> <span class="h-decl"><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"></span> |
337
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<span class="h-lno"> 2</span> <span class="h-ab"><</span><span class="h-tag">html</span><span class="h-ab">></span> |
338
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<span class="h-lno"> 3</span> <span class="h-ab"><</span><span class="h-tag">head</span><span class="h-ab">></span> |
339
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<span class="h-lno"> 4</span> <span class="h-ab"><</span><span class="h-tag">meta</span> <span class="h-attr">http-equiv</span>=<span class="h-attv">"Content-Type</span>" <span class="h-attr">content</span>=<span class="h-attv">"text/html; charset=iso-8859-1</span>"<span class="h-ab">></span> |
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<span class="h-lno"> 5</span> <span class="h-ab"><</span><span class="h-tag">link</span> <span class="h-attr">rel</span>=<span class="h-attv">"stylesheet</span>" <span class="h-attr">href</span>=<span class="h-attv">"/s/style.css</span>" <span class="h-attr">type</span>=<span class="h-attv">"text/css</span>"<span class="h-ab">></span> |
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<span class="h-lno"> 6</span> <span class="h-ab"><</span><span class="h-tag">title</span><span class="h-ab">></span>search.cpan.org: S<span class="h-ent">&#233;</span>bastien Aperghis-Tramoni<span class="h-ab"></</span><span class="h-tag">title</span><span class="h-ab">></span> |
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<span class="h-lno"> 7</span> <span class="h-ab"></</span><span class="h-tag">head</span><span class="h-ab">></span> |
343
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<span class="h-lno"> 8</span> <span class="h-ab"><</span><span class="h-tag">body</span> <span class="h-attr">id</span>=<span class="h-attv">"cpansearch</span>"<span class="h-ab">></span> |
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<span class="h-lno"> 9</span> <span class="h-ab"><</span><span class="h-tag">center</span><span class="h-ab">></span><span class="h-ab"><</span><span class="h-tag">div</span> <span class="h-attr">class</span>=<span class="h-attv">"logo</span>"<span class="h-ab">></span><span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/</span>"<span class="h-ab">></span><span class="h-ab"><</span><span class="h-tag">img</span> <span class="h-attr">src</span>=<span class="h-attv">"/s/img/cpan_banner.png</span>" <span class="h-attr">alt</span>=<span class="h-attv">"CPAN</span>"<span class="h-ab">></span><span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span><span class="h-ab"></</span><span class="h-tag">div</span><span class="h-ab">></span><span class="h-ab"></</span><span class="h-tag">center</span><span class="h-ab">></span> |
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<span class="h-lno"> 10</span> <span class="h-ab"><</span><span class="h-tag">div</span> <span class="h-attr">class</span>=<span class="h-attv">"menubar</span>"<span class="h-ab">></span> |
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<span class="h-lno"> 11</span> <span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/</span>"<span class="h-ab">></span>Home<span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span> |
347
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<span class="h-lno"> 12</span> <span class="h-ent">&middot;</span> <span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/author/</span>"<span class="h-ab">></span>Authors<span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span> |
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<span class="h-lno"> 13</span> <span class="h-ent">&middot;</span> <span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/recent</span>"<span class="h-ab">></span>Recent<span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span> |
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<span class="h-lno"> 14</span> <span class="h-ent">&middot;</span> <span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/news</span>"<span class="h-ab">></span>News<span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span> |
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<span class="h-lno"> 15</span> <span class="h-ent">&middot;</span> <span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/mirror</span>"<span class="h-ab">></span>Mirrors<span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span> |
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<span class="h-lno"> 16</span> <span class="h-ent">&middot;</span> <span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/faq.html</span>"<span class="h-ab">></span>FAQ<span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span> |
352
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<span class="h-lno"> 17</span> <span class="h-ent">&middot;</span> <span class="h-ab"><</span><span class="h-tag">a</span> <span class="h-attr">href</span>=<span class="h-attv">"/feedback</span>"<span class="h-ab">></span>Feedback<span class="h-ab"></</span><span class="h-tag">a</span><span class="h-ab">></span> |
353
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<span class="h-lno"> 18</span> <span class="h-ab"></</span><span class="h-tag">div</span><span class="h-ab">></span> |
354
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<span class="h-lno"> 19</span> <span class="h-ab"><</span><span class="h-tag">form</span> <span class="h-attr">method</span>=<span class="h-attv">"get</span>" <span class="h-attr">action</span>=<span class="h-attv">"/search</span>" <span class="h-attr">name</span>=<span class="h-attv">"f</span>" <span class="h-attr">class</span>=<span class="h-attv">"searchbox</span>"<span class="h-ab">></span> |
355
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<span class="h-lno"> 20</span> <span class="h-ab"><</span><span class="h-tag">input</span> <span class="h-attr">type</span>=<span class="h-attv">"text</span>" <span class="h-attr">name</span>=<span class="h-attv">"query</span>" <span class="h-attr">value</span>=<span class="h-attv">"</span>" <span class="h-attr">size</span>=<span class="h-attv">"35</span>"<span class="h-ab">></span> |
356
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<span class="h-lno"> 21</span> <span class="h-ab"><</span><span class="h-tag">br</span><span class="h-ab">></span>in <span class="h-ab"><</span><span class="h-tag">select</span> <span class="h-attr">name</span>=<span class="h-attv">"mode</span>"<span class="h-ab">></span> |
357
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<span class="h-lno"> 22</span> <span class="h-ab"><</span><span class="h-tag">option</span> <span class="h-attr">value</span>=<span class="h-attv">"all</span>"<span class="h-ab">></span>All<span class="h-ab"></</span><span class="h-tag">option</span><span class="h-ab">></span> |
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<span class="h-lno"> 23</span> <span class="h-ab"><</span><span class="h-tag">option</span> <span class="h-attr">value</span>=<span class="h-attv">"module</span>" <span class="h-ab">></span>Modules<span class="h-ab"></</span><span class="h-tag">option</span><span class="h-ab">></span> |
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<span class="h-lno"> 24</span> <span class="h-ab"><</span><span class="h-tag">option</span> <span class="h-attr">value</span>=<span class="h-attv">"dist</span>" <span class="h-ab">></span>Distributions<span class="h-ab"></</span><span class="h-tag">option</span><span class="h-ab">></span> |
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<span class="h-lno"> 25</span> <span class="h-ab"><</span><span class="h-tag">option</span> <span class="h-attr">value</span>=<span class="h-attv">"author</span>" <span class="h-ab">></span>Authors<span class="h-ab"></</span><span class="h-tag">option</span><span class="h-ab">></span> |
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<span class="h-lno"> 26</span> <span class="h-ab"></</span><span class="h-tag">select</span><span class="h-ab">></span><span class="h-ent">&nbsp;</span><span class="h-ab"><</span><span class="h-tag">input</span> <span class="h-attr">type</span>=<span class="h-attv">"submit</span>" <span class="h-attr">value</span>=<span class="h-attv">"CPAN Search</span>"<span class="h-ab">></span> |
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<span class="h-lno"> 27</span> <span class="h-ab"></</span><span class="h-tag">form</span><span class="h-ab">></span> |
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</pre> |
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365
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=end html |
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367
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=head1 CAVEATS |
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369
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C<Syntax::Highlight::HTML> relies on C<HTML::Parser> for parsing the HTML |
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and therefore suffers from the same limitations. |
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=head1 SEE ALSO |
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374
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L<HTML::Parser> |
375
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376
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=head1 AUTHORS |
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378
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SE<eacute>bastien Aperghis-Tramoni, E<lt>sebastien@aperghis.netE<gt> |
379
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380
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=head1 BUGS |
381
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382
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Please report any bugs or feature requests to |
383
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C<bug-syntax-highlight-html@rt.cpan.org>, or through the web interface at |
384
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L<https://rt.cpan.org/NoAuth/ReportBug.html?Queue=Syntax-Highlight-HTML>. |
385
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I will be notified, and then you'll automatically be notified of |
386
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progress on your bug as I make changes. |
387
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388
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=head1 COPYRIGHT & LICENSE |
389
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390
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Copyright (C)2004 SE<eacute>bastien Aperghis-Tramoni, All Rights Reserved. |
391
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392
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This program is free software; you can redistribute it and/or modify it |
393
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under the same terms as Perl itself. |
394
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395
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=cut |
396
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397
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1; |
398
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