para

use CSS::Minifier::Document;
use CSS::Minifier::Util;

class CSS::Minifier::Writer:ver<0.0.14>:auth<zef:sasha> {
    has Str  $.sep = '';
    has Bool $.color-masks = True;
    has Bool $.color-names = False;

    # --- Write a Document tree to minified CSS ---

    method write-document(Document $doc --> Str) {
        my $result = '';

        $result ~= $doc.licenses.join("\n") ~ "\n" if $doc.licenses;
        if $doc.statements {
            my @stmts = $doc.statements.map({ self!write-statement($_) });
            $result ~= @stmts.grep(?*).join($.sep);
        }

        $result;
    }

    method !write-statement(Statement $stmt --> Str) {
        given $stmt {
            when RuleSet { self!write-ruleset($_) }
            when AtRule  { self!write-at-rule($_) }
            default { die 'unknown statement type: ' ~ $stmt.^name }  # guard for future Statement types
        }
    }

    method !write-ruleset(RuleSet $rs --> Str) {
        my $sels = $rs.selectors.map({ self!url-quote-selector($_) }).join(', ');
        my $decls = self!write-decls($rs.declarations);
        $decls ?? $sels ~ '{' ~ $decls ~ '}' !! '';
    }

    method !write-at-rule(AtRule $ar --> Str) {
        my $prefix = '@' ~ $ar.name;
        $prefix ~= ' ' ~ $ar.prelude if $ar.prelude;

        if $ar.braceless {
            return $prefix ~ ';';
        }

        my $brace-space = $ar.prelude ?? ' ' !! '';

        my $inner = '';
        $inner ~= self!write-decls($ar.declarations) if $ar.declarations.elems > 0;
        $inner ~= ';' if $ar.declarations.elems > 0 && ($ar.statements.elems > 0 || $ar.trailing-declarations.elems > 0);
        $inner ~= $ar.statements.map({ self!write-statement($_) }).join($.sep) if $ar.statements.elems > 0;
        $inner ~= ';' if $ar.statements.elems > 0 && $ar.trailing-declarations.elems > 0;
        $inner ~= self!write-decls($ar.trailing-declarations) if $ar.trailing-declarations.elems > 0;

        return '' unless $inner;  # Empty block at-rules are dead code — drop silently
        $prefix ~ $brace-space ~ '{' ~ $inner ~ '}';
    }

    method !write-decls(Declaration @decls --> Str) {
        return '' unless @decls;
        @decls.map({
            my $v        = .value;
            my $is-custom = is-custom-prop(.property);
            my $lc-prop   = $is-custom ?? '' !! .property.lc;
            my $is-fw     = !$is-custom && $lc-prop eq 'font-weight';
            my $full-norm = $!color-masks && !$!color-names;

            $v = self!apply-color-names(.property, $v) if $!color-names;

            unless $is-custom {
                if $full-norm {
                    $v = .normalized // normalize-value(.property, $v);
                    .normalized = $v;
                }
                elsif $is-fw {
                    $v = .normalized // normalize-value(.property, $v);
                }
                else {
                    $v = strip-zero-units($v);
                }
            }

            my $key = $is-custom ?? .property !! $lc-prop;
            my $result = self!normalize-quotes($key, $v);
            $result ~= '!important' if .important;
            $result;
        }).join(';');
    }

    method !dq-to-sq(Str $s is copy --> Str) {
        $s ~~ s:g[ '\\"' ] = $SENTINEL;
        $s ~~ s:g/ '"' /'/;
        $s ~~ s:g[ $SENTINEL ] = '"';
        $s;
    }

    method !url-quote-selector(Str $s --> Str) {
        my $r = $s;
        unless $r.contains("'") {
            $r = self!dq-to-sq($r);
        }
        self!url-quote-value($r);
    }

    method !normalize-quotes(Str $property, Str $value --> Str) {
        my $v = $value;
        unless $v.contains("'") {
            $v = self!dq-to-sq($v);
        }
        my $s = self!url-quote-value($v);
        $property ~ ':' ~ $s;
    }

    method !url-quote-value(Str $s is copy --> Str) {
        my @chars = $s.comb;
        my $i = 0;
        my $out = '';
        loop {
            my $start = $s.index('url(', $i);
            last without $start;
            $out ~= $s.substr($i, $start - $i);
            my $depth = 1;
            my $j = $start + 4;
            while $j < @chars.elems && $depth > 0 {
                my $c = @chars[$j];
                if $c eq '(' { $depth++ }
                elsif $c eq ')' { $depth-- }
                elsif $c eq '"' || $c eq "'" { $j = skip-quoted(@chars, $j, $c); next }
                $j++;
            }
            my $inner = $s.substr($start + 4, $j - $start - 5);
            $inner ~~ / ^ (\s*) (.*?) (\s*) $ /;
            $out ~= 'url(' ~ $0 ~ self!url-quote(~$1) ~ $2 ~ ')';
            $i = $j;
        }
        $out ~= $s.substr($i) if $i < $s.chars;
        $out;
    }

    method !url-quote(Str $u --> Str) {
        return "'" ~ $u.substr(1, *-1).subst("'", "\\'", :g) ~ "'"
            if $u.starts-with("'") && $u.ends-with("'");
        return '"' ~ $u.substr(1, *-1).subst('"', '\\"', :g) ~ '"'
            if $u.starts-with('"') && $u.ends-with('"');
        "'" ~ $u.subst("'", "\\'", :g) ~ "'"
    }

    method !apply-color-names(Str $key, Str $value --> Str) {
        return $value unless %COLOR-PROPS{$key.lc} && $value !~~ $UNSAFE-RE;
        with-url-quarantine($value, -> $v is copy {
            $v = hsl-to-hex($v);
            $v = normalize-hex-value($v, :short($!color-masks));
            $v ~~ s:g/ <$HEX-TO-NAMED-RE> /%HEX-TO-NAME{lc $/}/;
            $v;
        });
    }
}



head

CSS::Minifier::Writer — Document-tree CSS serializer


Serializes a C<Document> tree back into minified CSS.  Handles:


item

When both C<:color-names> and C<:color-masks> are enabled, C<:color-names>
takes precedence (colors are named rather than hex-shortened).


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


root

Minifier

Util

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


Writer

NAME

DESCRIPTION

Attributes

Methods

AUTHOR

COPYRIGHT AND LICENSE

CSS::Minifier v0.0.14

Authors

License

Dependencies

Test Dependencies

Provides

Documentation