para

use CSS::Minifier::Document;
use CSS::Minifier::Plugin;

class CSS::Minifier::Plugin::Dedup:ver<0.0.14>:auth<zef:sasha> does CSS::Minifier::Plugin {
    method name(--> Str) { 'dedup' }

    method run(Document $doc --> Nil) {
        $doc.statements = self!dedup-block($doc.statements);
    }

    method !dedup-block(Statement @stmts --> Array[Statement]) {
        my %seen;
        my Statement @kept;

        for @stmts -> $stmt {
            given $stmt {
                when RuleSet {
                    next unless .declarations;
                    my $key = self!ruleset-key($_);
                    @kept.push: $stmt unless %seen{$key}++;
                }
                when AtRule {
                    # Declaration-only at-rules (e.g. @font-face, @view-transitions) deduped by content
                    if .statements.elems == 0 && (.declarations || .trailing-declarations) {
                        my $key = self!at-rule-decl-key($_);
                        unless %seen{$key}++ {
                            @kept.push: $stmt;
                        }
                    }
                    else {
                        # Recurse into nested statements
                        .statements = self!dedup-block(.statements);
                        @kept.push: $stmt;
                    }
                }
                default { @kept.push: $stmt }
            }
        }

        @kept;
    }

    method !ruleset-key(RuleSet $rs --> Str) {
        my $sel = $rs.selectors.sort.join(',');
        $rs.decl-key = declarations-to-key($rs.declarations) unless $rs.decl-key;
        "$sel\0$rs.decl-key";
    }

    method !at-rule-decl-key(AtRule $ar --> Str) {
        $ar.name.fc ~ "\0" ~ $ar.prelude.fc ~ "\0" ~ declarations-to-key($ar.declarations)
            ~ "\0" ~ declarations-to-key($ar.trailing-declarations);
    }
}



head

CSS::Minifier::Plugin::Dedup — duplicate ruleset and @font-face removal


Removes duplicate rulesets (same selectors + same declarations) and
duplicate C<@font-face> blocks at the same level.  Custom properties
are preserved verbatim and not deduped.


This library is free software; you can redistribute it and/or modify
it under CC0.


root

Merging

Pipeline

React

=begin React :component<HeaderCol> :id<menu> 
=para L<Documentation|/doc/introduction>
=para L<Modules| /mods>
=para L<Examples| file:../examples/index.podlite>
=para L<AI|file:../mcp/index.podlite>
=para L<Download |file:../download/index.podlite>
=para L<About|file:../about/index.podlite>
=para 🔍 K<⌘K>/K<ctrl-K>
=end React


=begin React :component<HeaderCol> :id<footer>  
=begin nested :!nested
=item1 B<Language>
    =item2 L<Get started|file:../getting-started/getting-started.podlite>
    =item2 L<Why Raku?|/doc/language/faq#Why-should-I-learn-Raku-What's-so-great-about-it>
    =item2 L<Try Raku|https://glot.io/new/raku>
    =item2 L<Download | file:../download/index.podlite>
    =item2 L<Raku cheat sheet|https://github.com/Raku/mu/blob/master/docs/Perl6/Cheatsheet/cheatsheet.txt>
    =item2 L<Raku on Exercism|https://exercism.org/tracks/raku>
    =item2 L<Wikipedia|https://en.wikipedia.org/wiki/Raku_(programming_language)>

=end nested
=begin nested :!nested

=item1 B<L<Documentation|/doc>>
    =item2 L<Getting started, Migration guides from other languages, & Tutorials | file:../doc/introduction.podlite>
    =item2 L<Language References|file:../doc/reference.podlite>
    =item2 L<Type Reference| file:../doc/types.podlite>
    =item2 L<Miscellaneous| file:../doc/miscellaneous.podlite>
    =item2 L<FAQs (Frequently Asked Questions)|/doc/language/faq>
    =item2 L<Community|/doc/language/community>
    =item2 L<The list of all documents|file:../doc/index.podlite>
    =item2 L<Hand these documents to an AI assistant|file:../mcp/index.podlite>

=end nested
=begin nested :!nested
=item1 B<Learning>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Wikibook |https://en.wikibooks.org/wiki/Raku_Programming>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>
    =item2 L<Learn Raku in Y minutes|https://learnxinyminutes.com/docs/raku/>
    =item2 L<Golfing |https://github.com/AlexDaniel/raku-golf-cheatsheet>
=end nested
=begin nested :!nested

=item1 B<Explore>
    =item2 L<Raku Blog Aggregator|https://planet.raku.org/>
    =item2 L<Rakudo Weekly|https://rakudoweekly.blog/>
    =item2 L<The Weekly Challenge |https://perlweeklychallenge.org/>
    =item2 L<Raku Advent Calendar|https://raku-advent.blog/>

=end nested
=end React


Built with L<Podlite|https://podlite.org> — the markup and publishing tools behind this site.


=begin React :component<CookieConsent> :id<CookieConsent> :buttonCaption("Got it!")
=para
This website uses cookies for analytics.
=end React


Dedup

NAME

DESCRIPTION

AUTHOR

COPYRIGHT AND LICENSE

CSS::Minifier v0.0.14

Authors

License

Dependencies

Test Dependencies

Provides

Documentation