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Less_Tree_Media
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2.15
1<?php
2/**
3 * @private
4 */
5class Less_Tree_Media extends Less_Tree {
6
7    /** @var Less_Tree_Value */
8    public $features;
9    /** @var Less_Tree_Ruleset[] */
10    public $rules;
11    /** @var int|null */
12    public $index;
13    /** @var array|null */
14    public $currentFileInfo;
15    /** @var bool|null */
16    public $isReferenced;
17
18    public function __construct( $value = [], $features = [], $index = null, $currentFileInfo = null ) {
19        $this->index = $index;
20        $this->currentFileInfo = $currentFileInfo;
21
22        $selectors = $this->emptySelectors();
23
24        $this->features = new Less_Tree_Value( $features );
25
26        $this->rules = [ new Less_Tree_Ruleset( $selectors, $value ) ];
27        $this->rules[0]->allowImports = true;
28    }
29
30    public function accept( $visitor ) {
31        $this->features = $visitor->visitObj( $this->features );
32        $this->rules = $visitor->visitArray( $this->rules );
33    }
34
35    /**
36     * @see Less_Tree::genCSS
37     */
38    public function genCSS( $output ) {
39        $output->add( '@media ', $this->currentFileInfo, $this->index );
40        $this->features->genCSS( $output );
41        Less_Tree::outputRuleset( $output, $this->rules );
42    }
43
44    /**
45     * @param Less_Environment $env
46     * @return self|Less_Tree_Ruleset
47     * @see less-2.5.3.js#Media.prototype.eval
48     */
49    public function compile( $env ) {
50        $media = new self( [], [], $this->index, $this->currentFileInfo );
51
52        $mathBypass = false;
53        if ( !$env->mathOn ) {
54            $mathBypass = true;
55            $env->mathOn = true;
56        }
57
58        $media->features = $this->features->compile( $env );
59
60        if ( $mathBypass ) {
61            $env->mathOn = false;
62        }
63
64        $env->mediaPath[] = $media;
65        $env->mediaBlocks[] = $media;
66
67        array_unshift( $env->frames, $this->rules[0] );
68        $media->rules = [ $this->rules[0]->compile( $env ) ];
69        array_shift( $env->frames );
70
71        array_pop( $env->mediaPath );
72
73        return !$env->mediaPath ? $media->compileTop( $env ) : $media->compileNested( $env );
74    }
75
76    public function variable( $name ) {
77        return $this->rules[0]->variable( $name );
78    }
79
80    public function find( $selector ) {
81        return $this->rules[0]->find( $selector, $this );
82    }
83
84    public function emptySelectors() {
85        $el = new Less_Tree_Element( '', '&', $this->index, $this->currentFileInfo );
86        $sels = [ new Less_Tree_Selector( [ $el ], [], null, $this->index, $this->currentFileInfo ) ];
87        $sels[0]->mediaEmpty = true;
88        return $sels;
89    }
90
91    public function markReferenced() {
92        $this->rules[0]->markReferenced();
93        $this->isReferenced = true;
94        Less_Tree::ReferencedArray( $this->rules[0]->rules );
95    }
96
97    // evaltop
98    public function compileTop( $env ) {
99        $result = $this;
100
101        if ( count( $env->mediaBlocks ) > 1 ) {
102            $selectors = $this->emptySelectors();
103            $result = new Less_Tree_Ruleset( $selectors, $env->mediaBlocks );
104            $result->multiMedia = true;
105        }
106
107        $env->mediaBlocks = [];
108        $env->mediaPath = [];
109
110        return $result;
111    }
112
113    /**
114     * @param Less_Environment $env
115     * @return Less_Tree_Ruleset
116     */
117    public function compileNested( $env ) {
118        $path = array_merge( $env->mediaPath, [ $this ] );
119        '@phan-var self[] $path';
120
121        // Extract the media-query conditions separated with `,` (OR).
122        foreach ( $path as $key => $p ) {
123            $value = $p->features instanceof Less_Tree_Value ? $p->features->value : $p->features;
124            $path[$key] = is_array( $value ) ? $value : [ $value ];
125        }
126        '@phan-var array<array<Less_Tree>> $path';
127
128        // Trace all permutations to generate the resulting media-query.
129        //
130        // (a, b and c) with nested (d, e) ->
131        //    a and d
132        //    a and e
133        //    b and c and d
134        //    b and c and e
135
136        $permuted = $this->permute( $path );
137        '@phan-var (Less_Tree|string)[][] $permuted';
138        $expressions = [];
139        foreach ( $permuted as $path ) {
140
141            for ( $i = 0, $len = count( $path ); $i < $len; $i++ ) {
142                $path[$i] = $path[$i] instanceof Less_Tree ? $path[$i] : new Less_Tree_Anonymous( $path[$i] );
143            }
144
145            for ( $i = count( $path ) - 1; $i > 0; $i-- ) {
146                array_splice( $path, $i, 0, [ new Less_Tree_Anonymous( 'and' ) ] );
147            }
148
149            $expressions[] = new Less_Tree_Expression( $path );
150        }
151        $this->features = new Less_Tree_Value( $expressions );
152
153        // Fake a tree-node that doesn't output anything.
154        return new Less_Tree_Ruleset( [], [] );
155    }
156
157    public function permute( $arr ) {
158        if ( !$arr ) {
159            return [];
160        }
161
162        if ( count( $arr ) == 1 ) {
163            return $arr[0];
164        }
165
166        $result = [];
167        $rest = $this->permute( array_slice( $arr, 1 ) );
168        foreach ( $rest as $r ) {
169            foreach ( $arr[0] as $a ) {
170                $result[] = array_merge(
171                    is_array( $a ) ? $a : [ $a ],
172                    is_array( $r ) ? $r : [ $r ]
173                );
174            }
175        }
176
177        return $result;
178    }
179
180    public function bubbleSelectors( $selectors ) {
181        if ( !$selectors ) {
182            return;
183        }
184
185        $this->rules = [ new Less_Tree_Ruleset( $selectors, [ $this->rules[0] ] ) ];
186    }
187
188}