Code Coverage |
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Functions and Methods |
Classes and Traits |
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| Total | |
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570 / 706 |
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11 / 45 |
CRAP | |
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0 / 1 |
| ValueParser | |
80.74% |
570 / 706 |
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24.44% |
11 / 45 |
1348.60 | |
0.00% |
0 / 1 |
| parseFromString | |
100.00% |
2 / 2 |
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1 / 1 |
1 | |||
| parse | |
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1 / 1 |
2 | |||
| parseSlashList | |
100.00% |
5 / 5 |
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100.00% |
1 / 1 |
2 | |||
| parseSpaceList | |
100.00% |
6 / 6 |
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100.00% |
1 / 1 |
2 | |||
| parseSingle | |
85.00% |
34 / 40 |
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17.98 | |||
| parseFunction | |
96.55% |
28 / 29 |
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0.00% |
0 / 1 |
20 | |||
| parseTransform | |
100.00% |
1 / 1 |
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100.00% |
1 / 1 |
1 | |||
| postProcessTransform | |
90.00% |
9 / 10 |
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0.00% |
0 / 1 |
5.03 | |||
| valueToTransformFunction | |
56.25% |
18 / 32 |
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0.00% |
0 / 1 |
151.64 | |||
| buildTranslate | |
41.67% |
5 / 12 |
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16.73 | |||
| buildRotate3d | |
0.00% |
0 / 8 |
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6 | |||
| buildScale | |
83.33% |
5 / 6 |
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3.04 | |||
| buildSkew | |
60.00% |
3 / 5 |
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0 / 1 |
3.58 | |||
| toLengthOrPct | |
28.57% |
2 / 7 |
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0.00% |
0 / 1 |
19.12 | |||
| toAngleDeg | |
40.00% |
2 / 5 |
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0.00% |
0 / 1 |
10.40 | |||
| toFloat | |
66.67% |
2 / 3 |
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0 / 1 |
4.59 | |||
| parseArgs | |
100.00% |
2 / 2 |
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100.00% |
1 / 1 |
1 | |||
| parseRgbFunction | |
85.71% |
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0.00% |
0 / 1 |
8.19 | |||
| extractRgbComponent | |
77.78% |
7 / 9 |
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0.00% |
0 / 1 |
4.18 | |||
| extractAlphaComponent | |
55.56% |
5 / 9 |
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0.00% |
0 / 1 |
5.40 | |||
| splitRgbSpaceForm | |
88.24% |
15 / 17 |
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0.00% |
0 / 1 |
8.10 | |||
| parseHslFunction | |
81.25% |
13 / 16 |
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0.00% |
0 / 1 |
9.53 | |||
| extractHueComponent | |
58.82% |
10 / 17 |
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0.00% |
0 / 1 |
16.98 | |||
| extractPercentageComponent | |
71.43% |
5 / 7 |
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0.00% |
0 / 1 |
3.21 | |||
| hslToRgb | |
86.36% |
19 / 22 |
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0.00% |
0 / 1 |
8.16 | |||
| parseHexColor | |
74.07% |
20 / 27 |
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0.00% |
0 / 1 |
6.63 | |||
| parseVarFunction | |
78.57% |
11 / 14 |
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0.00% |
0 / 1 |
7.48 | |||
| parseColorFunction | |
72.41% |
21 / 29 |
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0.00% |
0 / 1 |
21.37 | |||
| extractColorComponent | |
77.78% |
7 / 9 |
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0.00% |
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| parseCalcFunction | |
85.71% |
12 / 14 |
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| parseCalcSum | |
90.00% |
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| parseCalcProduct | |
90.00% |
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| parseCalcValue | |
83.33% |
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| isMatchingParenWrap | |
94.74% |
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9.01 | |||
| parseLinearGradient | |
85.00% |
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6.12 | |||
| parseLinearAngleHeader | |
94.12% |
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| sidesToAngle | |
41.67% |
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29.85 | |||
| parseGradientStop | |
80.00% |
12 / 15 |
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0.00% |
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| parseRadialGradient | |
86.96% |
20 / 23 |
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| isRadialHeader | |
100.00% |
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| parseRadialHeader | |
75.61% |
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| trimWhitespace | |
100.00% |
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| splitTopLevel | |
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| splitTopLevelDelim | |
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| splitOnWhitespace | |
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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Css; |
| 6 | |
| 7 | use Phpdftk\Css\Token\CommaToken; |
| 8 | use Phpdftk\Css\Token\DelimToken; |
| 9 | use Phpdftk\Css\Token\DimensionToken; |
| 10 | use Phpdftk\Css\Token\EofToken; |
| 11 | use Phpdftk\Css\Token\FunctionToken; |
| 12 | use Phpdftk\Css\Token\HashToken; |
| 13 | use Phpdftk\Css\Token\IdentToken; |
| 14 | use Phpdftk\Css\Token\LeftBraceToken; |
| 15 | use Phpdftk\Css\Token\LeftBracketToken; |
| 16 | use Phpdftk\Css\Token\LeftParenToken; |
| 17 | use Phpdftk\Css\Token\NumberToken; |
| 18 | use Phpdftk\Css\Token\PercentageToken; |
| 19 | use Phpdftk\Css\Token\RightBraceToken; |
| 20 | use Phpdftk\Css\Token\RightBracketToken; |
| 21 | use Phpdftk\Css\Token\RightParenToken; |
| 22 | use Phpdftk\Css\Token\StringToken; |
| 23 | use Phpdftk\Css\Token\Token; |
| 24 | use Phpdftk\Css\Token\UrlToken; |
| 25 | use Phpdftk\Css\Token\WhitespaceToken; |
| 26 | use Phpdftk\Css\Value\Angle; |
| 27 | use Phpdftk\Css\Value\AngleUnit; |
| 28 | use Phpdftk\Css\Value\Calc; |
| 29 | use Phpdftk\Css\Value\CalcBinary; |
| 30 | use Phpdftk\Css\Value\CalcExpression; |
| 31 | use Phpdftk\Css\Value\CalcFunc; |
| 32 | use Phpdftk\Css\Value\CalcFunction; |
| 33 | use Phpdftk\Css\Value\CalcLeaf; |
| 34 | use Phpdftk\Css\Value\CalcOp; |
| 35 | use Phpdftk\Css\Value\Color; |
| 36 | use Phpdftk\Css\Value\ColorSpace; |
| 37 | use Phpdftk\Css\Value\CssFunction; |
| 38 | use Phpdftk\Css\Value\CustomProperty; |
| 39 | use Phpdftk\Css\Value\Gradient; |
| 40 | use Phpdftk\Css\Value\GradientShape; |
| 41 | use Phpdftk\Css\Value\GradientStop; |
| 42 | use Phpdftk\Css\Value\Integer; |
| 43 | use Phpdftk\Css\Value\Keyword; |
| 44 | use Phpdftk\Css\Value\Length; |
| 45 | use Phpdftk\Css\Value\LengthUnit; |
| 46 | use Phpdftk\Css\Value\LinearGradient; |
| 47 | use Phpdftk\Css\Value\ListSeparator; |
| 48 | use Phpdftk\Css\Value\MatrixTransform; |
| 49 | use Phpdftk\Css\Value\NamedColors; |
| 50 | use Phpdftk\Css\Value\Number; |
| 51 | use Phpdftk\Css\Value\Percentage; |
| 52 | use Phpdftk\Css\Value\RadialGradient; |
| 53 | use Phpdftk\Css\Value\RotateTransform; |
| 54 | use Phpdftk\Css\Value\ScaleTransform; |
| 55 | use Phpdftk\Css\Value\SkewTransform; |
| 56 | use Phpdftk\Css\Value\StringValue; |
| 57 | use Phpdftk\Css\Value\Transform; |
| 58 | use Phpdftk\Css\Value\TransformFunction; |
| 59 | use Phpdftk\Css\Value\TranslateTransform; |
| 60 | use Phpdftk\Css\Value\Url; |
| 61 | use Phpdftk\Css\Value\Value; |
| 62 | use Phpdftk\Css\Value\ValueList; |
| 63 | |
| 64 | /** |
| 65 | * Parses a CSS token stream into typed Value instances per CSS Values 4. |
| 66 | * |
| 67 | * Phase 1A.2 covers the common path: keywords, numbers, integers, |
| 68 | * percentages, lengths (all units), colors (hex / named / rgb / rgba / |
| 69 | * hsl / hsla / transparent), strings, urls, single-argument function |
| 70 | * fallback. Calc, gradients, transforms, and color() with explicit space |
| 71 | * are deferred — they get dedicated parsers in 1A.2-bis. |
| 72 | */ |
| 73 | final class ValueParser |
| 74 | { |
| 75 | /** |
| 76 | * Parse the entire token stream as a single value. Whitespace-separated |
| 77 | * tokens become a `ValueList(Space)`; comma-separated become |
| 78 | * `ValueList(Comma)`. A lone value is returned bare. |
| 79 | */ |
| 80 | public function parseFromString(string $css): Value |
| 81 | { |
| 82 | $tokens = (new Tokenizer($css))->tokenize(); |
| 83 | return $this->parse($tokens); |
| 84 | } |
| 85 | |
| 86 | /** @param list<Token> $tokens */ |
| 87 | public function parse(array $tokens): Value |
| 88 | { |
| 89 | $tokens = self::trimWhitespace($tokens); |
| 90 | |
| 91 | // Split on top-level commas first. |
| 92 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 93 | if (count($commaGroups) > 1) { |
| 94 | $values = array_map(fn($g): Value => $this->parseSlashList($g), $commaGroups); |
| 95 | return new ValueList($values, ListSeparator::Comma); |
| 96 | } |
| 97 | return $this->parseSlashList($tokens); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Per CSS Values 4, `/` is a top-level separator inside a comma group |
| 102 | * for several shorthands (`font: 16px/1.5 sans-serif`, `border-radius: |
| 103 | * 4px / 8px`, `background: <bg-color> / <bg-size>` etc.). Splits the |
| 104 | * group on top-level `/` delims, then recurses into the space-list |
| 105 | * parser for each slash segment. |
| 106 | * |
| 107 | * @param list<Token> $tokens |
| 108 | */ |
| 109 | private function parseSlashList(array $tokens): Value |
| 110 | { |
| 111 | $slashGroups = self::splitTopLevelDelim($tokens, '/'); |
| 112 | if (count($slashGroups) > 1) { |
| 113 | $values = array_map(fn($g): Value => $this->parseSpaceList($g), $slashGroups); |
| 114 | return new ValueList($values, ListSeparator::Slash); |
| 115 | } |
| 116 | return $this->parseSpaceList($tokens); |
| 117 | } |
| 118 | |
| 119 | /** @param list<Token> $tokens */ |
| 120 | private function parseSpaceList(array $tokens): Value |
| 121 | { |
| 122 | $tokens = self::trimWhitespace($tokens); |
| 123 | $parts = self::splitOnWhitespace($tokens); |
| 124 | if (count($parts) === 1) { |
| 125 | return $this->parseSingle($parts[0]); |
| 126 | } |
| 127 | $values = array_map(fn($p): Value => $this->parseSingle($p), $parts); |
| 128 | return new ValueList($values, ListSeparator::Space); |
| 129 | } |
| 130 | |
| 131 | /** @param list<Token> $tokens A single value without separators. */ |
| 132 | private function parseSingle(array $tokens): Value |
| 133 | { |
| 134 | if ($tokens === []) { |
| 135 | return new Keyword(''); // shouldn't happen in well-formed input |
| 136 | } |
| 137 | $head = $tokens[0]; |
| 138 | if ($head instanceof IdentToken) { |
| 139 | $name = strtolower($head->value); |
| 140 | if ($name === 'transparent') { |
| 141 | return new Color(0, 0, 0, 0); |
| 142 | } |
| 143 | $named = NamedColors::lookup($name); |
| 144 | if ($named !== null) { |
| 145 | return $named; |
| 146 | } |
| 147 | return new Keyword($name); |
| 148 | } |
| 149 | if ($head instanceof HashToken) { |
| 150 | $color = $this->parseHexColor($head->value); |
| 151 | if ($color !== null) { |
| 152 | return $color; |
| 153 | } |
| 154 | return new Keyword('#' . $head->value); |
| 155 | } |
| 156 | if ($head instanceof NumberToken) { |
| 157 | return $head->type->name === 'Integer' |
| 158 | ? new Integer((int) $head->value) |
| 159 | : new Number($head->value); |
| 160 | } |
| 161 | if ($head instanceof PercentageToken) { |
| 162 | return new Percentage($head->value); |
| 163 | } |
| 164 | if ($head instanceof DimensionToken) { |
| 165 | $unit = strtolower($head->unit); |
| 166 | $lengthUnit = LengthUnit::tryFrom($unit); |
| 167 | if ($lengthUnit !== null) { |
| 168 | return new Length($head->value, $lengthUnit); |
| 169 | } |
| 170 | $angleUnit = AngleUnit::tryFrom($unit); |
| 171 | if ($angleUnit !== null) { |
| 172 | return new Angle($head->value, $angleUnit); |
| 173 | } |
| 174 | // Unknown unit — fall back to a CssFunction representation so the |
| 175 | // value survives round-trip without being silently dropped. |
| 176 | return new CssFunction($head->unit, [new Number($head->value)]); |
| 177 | } |
| 178 | if ($head instanceof StringToken) { |
| 179 | return new StringValue($head->value); |
| 180 | } |
| 181 | if ($head instanceof UrlToken) { |
| 182 | return new Url($head->value); |
| 183 | } |
| 184 | if ($head instanceof FunctionToken) { |
| 185 | return $this->parseFunction($head->name, array_slice($tokens, 1)); |
| 186 | } |
| 187 | // Fallback — keep the raw delim as a one-char keyword. |
| 188 | if ($head instanceof DelimToken) { |
| 189 | return new Keyword($head->value); |
| 190 | } |
| 191 | return new Keyword(''); |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * @param list<Token> $tokens The function body, excluding the |
| 196 | * FunctionToken header and the closing RightParenToken. |
| 197 | */ |
| 198 | private function parseFunction(string $name, array $tokens): Value |
| 199 | { |
| 200 | $name = strtolower($name); |
| 201 | // Drop the trailing ) if present. |
| 202 | if ($tokens !== [] && end($tokens) instanceof RightParenToken) { |
| 203 | array_pop($tokens); |
| 204 | } |
| 205 | if ($name === 'url') { |
| 206 | // url("...") form. |
| 207 | foreach ($tokens as $tok) { |
| 208 | if ($tok instanceof StringToken) { |
| 209 | return new Url($tok->value); |
| 210 | } |
| 211 | } |
| 212 | return new Url(''); |
| 213 | } |
| 214 | if ($name === 'rgb' || $name === 'rgba') { |
| 215 | return $this->parseRgbFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 216 | } |
| 217 | if ($name === 'hsl' || $name === 'hsla') { |
| 218 | return $this->parseHslFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 219 | } |
| 220 | if ($name === 'var') { |
| 221 | return $this->parseVarFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 222 | } |
| 223 | if ($name === 'color') { |
| 224 | return $this->parseColorFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 225 | } |
| 226 | if (CalcFunction::tryFrom($name) !== null) { |
| 227 | $calc = $this->parseCalcFunction(CalcFunction::from($name), $tokens); |
| 228 | if ($calc !== null) { |
| 229 | return $calc; |
| 230 | } |
| 231 | } |
| 232 | if ($name === 'linear-gradient' || $name === 'repeating-linear-gradient') { |
| 233 | $g = $this->parseLinearGradient($tokens, $name === 'repeating-linear-gradient'); |
| 234 | if ($g !== null) { |
| 235 | return $g; |
| 236 | } |
| 237 | } |
| 238 | if ($name === 'radial-gradient' || $name === 'repeating-radial-gradient') { |
| 239 | $g = $this->parseRadialGradient($tokens, $name === 'repeating-radial-gradient'); |
| 240 | if ($g !== null) { |
| 241 | return $g; |
| 242 | } |
| 243 | } |
| 244 | // Generic fallback: each comma-separated group becomes one argument. |
| 245 | return new CssFunction($name, $this->parseArgs($tokens)); |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Parse a sequence of transform functions into a single Transform value. |
| 250 | * Call from the cascade when the property being computed is `transform`. |
| 251 | */ |
| 252 | public function parseTransform(string $css): Value |
| 253 | { |
| 254 | return $this->postProcessTransform($this->parseFromString($css)); |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Convert an already-parsed generic value (`CssFunction` or |
| 259 | * `ValueList` of `CssFunction`s) into a typed `Transform` value. |
| 260 | * Falls back to the original value when a function isn't a |
| 261 | * recognised transform — preserves `none` and any future |
| 262 | * additions that aren't yet handled. |
| 263 | */ |
| 264 | public function postProcessTransform(Value $value): Value |
| 265 | { |
| 266 | if ($value instanceof Transform) { |
| 267 | return $value; |
| 268 | } |
| 269 | $items = $value instanceof ValueList ? $value->values : [$value]; |
| 270 | $fns = []; |
| 271 | foreach ($items as $v) { |
| 272 | $fn = $this->valueToTransformFunction($v); |
| 273 | if ($fn === null) { |
| 274 | return $value; |
| 275 | } |
| 276 | $fns[] = $fn; |
| 277 | } |
| 278 | return new Transform($fns); |
| 279 | } |
| 280 | |
| 281 | private function valueToTransformFunction(Value $value): ?TransformFunction |
| 282 | { |
| 283 | if (!$value instanceof CssFunction) { |
| 284 | return null; |
| 285 | } |
| 286 | $name = strtolower($value->name); |
| 287 | $args = $value->arguments; |
| 288 | return match ($name) { |
| 289 | 'translate' => $this->buildTranslate($args, false), |
| 290 | 'translatex' => count($args) === 1 ? new TranslateTransform($this->toLengthOrPct($args[0]), new Length(0, LengthUnit::Px)) : null, |
| 291 | 'translatey' => count($args) === 1 ? new TranslateTransform(new Length(0, LengthUnit::Px), $this->toLengthOrPct($args[0])) : null, |
| 292 | 'translatez' => count($args) === 1 && $args[0] instanceof Length ? new TranslateTransform(new Length(0, LengthUnit::Px), new Length(0, LengthUnit::Px), $args[0]) : null, |
| 293 | 'translate3d' => $this->buildTranslate($args, true), |
| 294 | 'rotate' => count($args) === 1 ? new RotateTransform($this->toAngleDeg($args[0])) : null, |
| 295 | 'rotatex' => count($args) === 1 ? new RotateTransform($this->toAngleDeg($args[0]), 1.0, 0.0, 0.0) : null, |
| 296 | 'rotatey' => count($args) === 1 ? new RotateTransform($this->toAngleDeg($args[0]), 0.0, 1.0, 0.0) : null, |
| 297 | 'rotatez' => count($args) === 1 ? new RotateTransform($this->toAngleDeg($args[0]), 0.0, 0.0, 1.0) : null, |
| 298 | 'rotate3d' => $this->buildRotate3d($args), |
| 299 | 'scale' => $this->buildScale($args), |
| 300 | 'scalex' => count($args) === 1 ? new ScaleTransform($this->toFloat($args[0]), 1.0) : null, |
| 301 | 'scaley' => count($args) === 1 ? new ScaleTransform(1.0, $this->toFloat($args[0])) : null, |
| 302 | 'scalez' => count($args) === 1 ? new ScaleTransform(1.0, 1.0, $this->toFloat($args[0])) : null, |
| 303 | 'scale3d' => count($args) === 3 ? new ScaleTransform($this->toFloat($args[0]), $this->toFloat($args[1]), $this->toFloat($args[2])) : null, |
| 304 | 'skew' => $this->buildSkew($args), |
| 305 | 'skewx' => count($args) === 1 ? new SkewTransform($this->toAngleDeg($args[0])) : null, |
| 306 | 'skewy' => count($args) === 1 ? new SkewTransform(0.0, $this->toAngleDeg($args[0])) : null, |
| 307 | 'matrix' => count($args) === 6 ? new MatrixTransform( |
| 308 | $this->toFloat($args[0]), |
| 309 | $this->toFloat($args[1]), |
| 310 | $this->toFloat($args[2]), |
| 311 | $this->toFloat($args[3]), |
| 312 | $this->toFloat($args[4]), |
| 313 | $this->toFloat($args[5]), |
| 314 | ) : null, |
| 315 | default => null, |
| 316 | }; |
| 317 | } |
| 318 | |
| 319 | /** @param list<Value> $args */ |
| 320 | private function buildTranslate(array $args, bool $is3d): ?TransformFunction |
| 321 | { |
| 322 | if ($is3d) { |
| 323 | if (count($args) !== 3) { |
| 324 | return null; |
| 325 | } |
| 326 | $z = $args[2] instanceof Length ? $args[2] : null; |
| 327 | if ($z === null) { |
| 328 | return null; |
| 329 | } |
| 330 | return new TranslateTransform($this->toLengthOrPct($args[0]), $this->toLengthOrPct($args[1]), $z); |
| 331 | } |
| 332 | if (count($args) === 1) { |
| 333 | return new TranslateTransform($this->toLengthOrPct($args[0]), new Length(0, LengthUnit::Px)); |
| 334 | } |
| 335 | if (count($args) === 2) { |
| 336 | return new TranslateTransform($this->toLengthOrPct($args[0]), $this->toLengthOrPct($args[1])); |
| 337 | } |
| 338 | return null; |
| 339 | } |
| 340 | |
| 341 | /** @param list<Value> $args */ |
| 342 | private function buildRotate3d(array $args): ?RotateTransform |
| 343 | { |
| 344 | if (count($args) !== 4) { |
| 345 | return null; |
| 346 | } |
| 347 | return new RotateTransform( |
| 348 | $this->toAngleDeg($args[3]), |
| 349 | $this->toFloat($args[0]), |
| 350 | $this->toFloat($args[1]), |
| 351 | $this->toFloat($args[2]), |
| 352 | ); |
| 353 | } |
| 354 | |
| 355 | /** @param list<Value> $args */ |
| 356 | private function buildScale(array $args): ?ScaleTransform |
| 357 | { |
| 358 | if (count($args) === 1) { |
| 359 | $sx = $this->toFloat($args[0]); |
| 360 | return new ScaleTransform($sx, $sx); |
| 361 | } |
| 362 | if (count($args) === 2) { |
| 363 | return new ScaleTransform($this->toFloat($args[0]), $this->toFloat($args[1])); |
| 364 | } |
| 365 | return null; |
| 366 | } |
| 367 | |
| 368 | /** @param list<Value> $args */ |
| 369 | private function buildSkew(array $args): ?SkewTransform |
| 370 | { |
| 371 | if (count($args) === 1) { |
| 372 | return new SkewTransform($this->toAngleDeg($args[0])); |
| 373 | } |
| 374 | if (count($args) === 2) { |
| 375 | return new SkewTransform($this->toAngleDeg($args[0]), $this->toAngleDeg($args[1])); |
| 376 | } |
| 377 | return null; |
| 378 | } |
| 379 | |
| 380 | private function toLengthOrPct(Value $v): Length|Percentage |
| 381 | { |
| 382 | if ($v instanceof Length) { |
| 383 | return $v; |
| 384 | } |
| 385 | if ($v instanceof Percentage) { |
| 386 | return $v; |
| 387 | } |
| 388 | if ($v instanceof Number || $v instanceof Integer) { |
| 389 | // Per spec: in some contexts unitless numbers are treated as pixels. |
| 390 | return new Length((float) ($v instanceof Number ? $v->value : $v->value), LengthUnit::Px); |
| 391 | } |
| 392 | return new Length(0, LengthUnit::Px); |
| 393 | } |
| 394 | |
| 395 | private function toAngleDeg(Value $v): float |
| 396 | { |
| 397 | if ($v instanceof Angle) { |
| 398 | return $v->toDegrees(); |
| 399 | } |
| 400 | if ($v instanceof Number || $v instanceof Integer) { |
| 401 | // Unitless 0 is the only valid angle without a unit per spec; |
| 402 | // other unitless values are technically a parse error, but we |
| 403 | // accept them by treating as degrees. |
| 404 | return (float) ($v instanceof Number ? $v->value : $v->value); |
| 405 | } |
| 406 | return 0.0; |
| 407 | } |
| 408 | |
| 409 | private function toFloat(Value $v): float |
| 410 | { |
| 411 | if ($v instanceof Number || $v instanceof Integer) { |
| 412 | return (float) ($v instanceof Number ? $v->value : $v->value); |
| 413 | } |
| 414 | return 0.0; |
| 415 | } |
| 416 | |
| 417 | /** @param list<Token> $tokens |
| 418 | * @return list<Value> |
| 419 | */ |
| 420 | private function parseArgs(array $tokens): array |
| 421 | { |
| 422 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 423 | return array_map(fn($g): Value => $this->parseSpaceList($g), $groups); |
| 424 | } |
| 425 | |
| 426 | /** @param list<Token> $tokens */ |
| 427 | private function parseRgbFunction(array $tokens): ?Color |
| 428 | { |
| 429 | // Accept both legacy comma form `rgb(r, g, b[, a])` and modern |
| 430 | // space form `rgb(r g b [/ a])`. Components are number 0-255 or |
| 431 | // percentage 0-100; alpha is number 0-1 or percentage. |
| 432 | $tokens = self::trimWhitespace($tokens); |
| 433 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 434 | if (count($commaGroups) >= 3) { |
| 435 | $groups = $commaGroups; |
| 436 | } else { |
| 437 | // Space-separated; the slash separates alpha. |
| 438 | $groups = self::splitRgbSpaceForm($tokens); |
| 439 | } |
| 440 | $count = count($groups); |
| 441 | if ($count < 3 || $count > 4) { |
| 442 | return null; |
| 443 | } |
| 444 | $rgb = []; |
| 445 | for ($i = 0; $i < 3; $i++) { |
| 446 | $v = $this->extractRgbComponent($groups[$i]); |
| 447 | if ($v === null) { |
| 448 | return null; |
| 449 | } |
| 450 | $rgb[] = $v; |
| 451 | } |
| 452 | $a = 1.0; |
| 453 | if ($count === 4) { |
| 454 | $alphaTok = $this->extractAlphaComponent($groups[3]); |
| 455 | if ($alphaTok === null) { |
| 456 | return null; |
| 457 | } |
| 458 | $a = $alphaTok; |
| 459 | } |
| 460 | return new Color($rgb[0], $rgb[1], $rgb[2], $a); |
| 461 | } |
| 462 | |
| 463 | /** @param list<Token> $group */ |
| 464 | private function extractRgbComponent(array $group): ?float |
| 465 | { |
| 466 | $group = self::trimWhitespace($group); |
| 467 | if (count($group) !== 1) { |
| 468 | return null; |
| 469 | } |
| 470 | $t = $group[0]; |
| 471 | if ($t instanceof NumberToken) { |
| 472 | return max(0.0, min(1.0, $t->value / 255.0)); |
| 473 | } |
| 474 | if ($t instanceof PercentageToken) { |
| 475 | return max(0.0, min(1.0, $t->value / 100.0)); |
| 476 | } |
| 477 | return null; |
| 478 | } |
| 479 | |
| 480 | /** @param list<Token> $group */ |
| 481 | private function extractAlphaComponent(array $group): ?float |
| 482 | { |
| 483 | $group = self::trimWhitespace($group); |
| 484 | if (count($group) !== 1) { |
| 485 | return null; |
| 486 | } |
| 487 | $t = $group[0]; |
| 488 | if ($t instanceof NumberToken) { |
| 489 | return max(0.0, min(1.0, $t->value)); |
| 490 | } |
| 491 | if ($t instanceof PercentageToken) { |
| 492 | return max(0.0, min(1.0, $t->value / 100.0)); |
| 493 | } |
| 494 | return null; |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * Split tokens by top-level whitespace, with `/` recognised as the |
| 499 | * alpha separator that yields a 4th group. |
| 500 | * |
| 501 | * @param list<Token> $tokens |
| 502 | * @return list<list<Token>> |
| 503 | */ |
| 504 | private static function splitRgbSpaceForm(array $tokens): array |
| 505 | { |
| 506 | $groups = []; |
| 507 | $current = []; |
| 508 | foreach ($tokens as $t) { |
| 509 | if ($t instanceof WhitespaceToken) { |
| 510 | if ($current !== []) { |
| 511 | $groups[] = $current; |
| 512 | $current = []; |
| 513 | } |
| 514 | continue; |
| 515 | } |
| 516 | if ($t instanceof DelimToken && $t->value === '/') { |
| 517 | if ($current !== []) { |
| 518 | $groups[] = $current; |
| 519 | $current = []; |
| 520 | } |
| 521 | continue; |
| 522 | } |
| 523 | $current[] = $t; |
| 524 | } |
| 525 | if ($current !== []) { |
| 526 | $groups[] = $current; |
| 527 | } |
| 528 | return $groups; |
| 529 | } |
| 530 | |
| 531 | /** @param list<Token> $tokens */ |
| 532 | private function parseHslFunction(array $tokens): ?Color |
| 533 | { |
| 534 | $tokens = self::trimWhitespace($tokens); |
| 535 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 536 | $groups = count($commaGroups) >= 3 ? $commaGroups : self::splitRgbSpaceForm($tokens); |
| 537 | $count = count($groups); |
| 538 | if ($count < 3 || $count > 4) { |
| 539 | return null; |
| 540 | } |
| 541 | $h = $this->extractHueComponent($groups[0]); |
| 542 | $s = $this->extractPercentageComponent($groups[1]); |
| 543 | $l = $this->extractPercentageComponent($groups[2]); |
| 544 | if ($h === null || $s === null || $l === null) { |
| 545 | return null; |
| 546 | } |
| 547 | $a = $count === 4 ? $this->extractAlphaComponent($groups[3]) : 1.0; |
| 548 | if ($a === null) { |
| 549 | return null; |
| 550 | } |
| 551 | [$r, $g, $b] = self::hslToRgb($h, $s, $l); |
| 552 | return new Color($r, $g, $b, $a); |
| 553 | } |
| 554 | |
| 555 | /** @param list<Token> $group */ |
| 556 | private function extractHueComponent(array $group): ?float |
| 557 | { |
| 558 | $group = self::trimWhitespace($group); |
| 559 | if (count($group) !== 1) { |
| 560 | return null; |
| 561 | } |
| 562 | $t = $group[0]; |
| 563 | if ($t instanceof NumberToken) { |
| 564 | return fmod(fmod($t->value, 360) + 360, 360) / 360.0; // normalise to [0, 1) |
| 565 | } |
| 566 | if ($t instanceof DimensionToken) { |
| 567 | $degrees = match (strtolower($t->unit)) { |
| 568 | 'deg' => $t->value, |
| 569 | 'rad' => $t->value * 180 / M_PI, |
| 570 | 'grad' => $t->value * 0.9, |
| 571 | 'turn' => $t->value * 360, |
| 572 | default => null, |
| 573 | }; |
| 574 | if ($degrees === null) { |
| 575 | return null; |
| 576 | } |
| 577 | return fmod(fmod($degrees, 360) + 360, 360) / 360.0; |
| 578 | } |
| 579 | return null; |
| 580 | } |
| 581 | |
| 582 | /** @param list<Token> $group */ |
| 583 | private function extractPercentageComponent(array $group): ?float |
| 584 | { |
| 585 | $group = self::trimWhitespace($group); |
| 586 | if (count($group) !== 1) { |
| 587 | return null; |
| 588 | } |
| 589 | $t = $group[0]; |
| 590 | if ($t instanceof PercentageToken) { |
| 591 | return max(0.0, min(1.0, $t->value / 100.0)); |
| 592 | } |
| 593 | return null; |
| 594 | } |
| 595 | |
| 596 | /** |
| 597 | * Convert HSL (each component in [0, 1]) to sRGB (each component in [0, 1]) |
| 598 | * per CSS Color 4 algorithm. |
| 599 | * |
| 600 | * @return array{0:float,1:float,2:float} |
| 601 | */ |
| 602 | private static function hslToRgb(float $h, float $s, float $l): array |
| 603 | { |
| 604 | if ($s === 0.0) { |
| 605 | return [$l, $l, $l]; |
| 606 | } |
| 607 | $q = $l < 0.5 ? $l * (1 + $s) : $l + $s - $l * $s; |
| 608 | $p = 2 * $l - $q; |
| 609 | $hueToRgb = static function (float $p, float $q, float $t): float { |
| 610 | if ($t < 0) { |
| 611 | $t += 1; |
| 612 | } |
| 613 | if ($t > 1) { |
| 614 | $t -= 1; |
| 615 | } |
| 616 | if ($t < 1 / 6) { |
| 617 | return $p + ($q - $p) * 6 * $t; |
| 618 | } |
| 619 | if ($t < 1 / 2) { |
| 620 | return $q; |
| 621 | } |
| 622 | if ($t < 2 / 3) { |
| 623 | return $p + ($q - $p) * (2 / 3 - $t) * 6; |
| 624 | } |
| 625 | return $p; |
| 626 | }; |
| 627 | return [ |
| 628 | $hueToRgb($p, $q, $h + 1 / 3), |
| 629 | $hueToRgb($p, $q, $h), |
| 630 | $hueToRgb($p, $q, $h - 1 / 3), |
| 631 | ]; |
| 632 | } |
| 633 | |
| 634 | private function parseHexColor(string $hex): ?Color |
| 635 | { |
| 636 | $hex = strtolower($hex); |
| 637 | // Accept 3, 4, 6, 8 hex digits. |
| 638 | if (!preg_match('/^[0-9a-f]+$/', $hex)) { |
| 639 | return null; |
| 640 | } |
| 641 | $len = strlen($hex); |
| 642 | if ($len === 3) { |
| 643 | $r = hexdec($hex[0] . $hex[0]); |
| 644 | $g = hexdec($hex[1] . $hex[1]); |
| 645 | $b = hexdec($hex[2] . $hex[2]); |
| 646 | return new Color($r / 255.0, $g / 255.0, $b / 255.0); |
| 647 | } |
| 648 | if ($len === 4) { |
| 649 | $r = hexdec($hex[0] . $hex[0]); |
| 650 | $g = hexdec($hex[1] . $hex[1]); |
| 651 | $b = hexdec($hex[2] . $hex[2]); |
| 652 | $a = hexdec($hex[3] . $hex[3]); |
| 653 | return new Color($r / 255.0, $g / 255.0, $b / 255.0, $a / 255.0); |
| 654 | } |
| 655 | if ($len === 6) { |
| 656 | $r = hexdec(substr($hex, 0, 2)); |
| 657 | $g = hexdec(substr($hex, 2, 2)); |
| 658 | $b = hexdec(substr($hex, 4, 2)); |
| 659 | return new Color($r / 255.0, $g / 255.0, $b / 255.0); |
| 660 | } |
| 661 | if ($len === 8) { |
| 662 | $r = hexdec(substr($hex, 0, 2)); |
| 663 | $g = hexdec(substr($hex, 2, 2)); |
| 664 | $b = hexdec(substr($hex, 4, 2)); |
| 665 | $a = hexdec(substr($hex, 6, 2)); |
| 666 | return new Color($r / 255.0, $g / 255.0, $b / 255.0, $a / 255.0); |
| 667 | } |
| 668 | return null; |
| 669 | } |
| 670 | |
| 671 | // ============================================================ |
| 672 | // var(--name, fallback) |
| 673 | // ============================================================ |
| 674 | /** @param list<Token> $tokens */ |
| 675 | private function parseVarFunction(array $tokens): ?CustomProperty |
| 676 | { |
| 677 | $tokens = self::trimWhitespace($tokens); |
| 678 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 679 | if (count($groups) < 1 || count($groups) > 2) { |
| 680 | return null; |
| 681 | } |
| 682 | $nameTokens = self::trimWhitespace($groups[0]); |
| 683 | if (count($nameTokens) !== 1 || !($nameTokens[0] instanceof IdentToken)) { |
| 684 | return null; |
| 685 | } |
| 686 | $name = $nameTokens[0]->value; |
| 687 | if (!str_starts_with($name, '--')) { |
| 688 | return null; |
| 689 | } |
| 690 | $fallback = null; |
| 691 | if (count($groups) === 2) { |
| 692 | $fallback = $this->parseSpaceList($groups[1]); |
| 693 | } |
| 694 | return new CustomProperty($name, $fallback); |
| 695 | } |
| 696 | |
| 697 | // ============================================================ |
| 698 | // color(<space> r g b [/ a]) |
| 699 | // ============================================================ |
| 700 | /** @param list<Token> $tokens */ |
| 701 | private function parseColorFunction(array $tokens): ?Color |
| 702 | { |
| 703 | $tokens = self::trimWhitespace($tokens); |
| 704 | $groups = self::splitRgbSpaceForm($tokens); |
| 705 | // Expect: [space] [r] [g] [b] (4 groups), with optional [a] (5 groups). |
| 706 | if (count($groups) < 4 || count($groups) > 5) { |
| 707 | return null; |
| 708 | } |
| 709 | $spaceTokens = self::trimWhitespace($groups[0]); |
| 710 | if (count($spaceTokens) !== 1 || !($spaceTokens[0] instanceof IdentToken)) { |
| 711 | return null; |
| 712 | } |
| 713 | $space = match (strtolower($spaceTokens[0]->value)) { |
| 714 | 'srgb' => ColorSpace::sRGB, |
| 715 | 'display-p3' => ColorSpace::DisplayP3, |
| 716 | 'a98-rgb' => ColorSpace::A98RGB, |
| 717 | 'prophoto-rgb' => ColorSpace::ProPhotoRGB, |
| 718 | 'rec2020' => ColorSpace::Rec2020, |
| 719 | default => null, |
| 720 | }; |
| 721 | if ($space === null) { |
| 722 | return null; |
| 723 | } |
| 724 | $components = []; |
| 725 | for ($i = 1; $i <= 3; $i++) { |
| 726 | $c = $this->extractColorComponent($groups[$i]); |
| 727 | if ($c === null) { |
| 728 | return null; |
| 729 | } |
| 730 | $components[] = $c; |
| 731 | } |
| 732 | $a = 1.0; |
| 733 | if (count($groups) === 5) { |
| 734 | $aValue = $this->extractAlphaComponent($groups[4]); |
| 735 | if ($aValue === null) { |
| 736 | return null; |
| 737 | } |
| 738 | $a = $aValue; |
| 739 | } |
| 740 | return new Color($components[0], $components[1], $components[2], $a, $space); |
| 741 | } |
| 742 | |
| 743 | /** @param list<Token> $group */ |
| 744 | private function extractColorComponent(array $group): ?float |
| 745 | { |
| 746 | $group = self::trimWhitespace($group); |
| 747 | if (count($group) !== 1) { |
| 748 | return null; |
| 749 | } |
| 750 | $t = $group[0]; |
| 751 | if ($t instanceof NumberToken) { |
| 752 | // color() takes 0-1 numbers for sRGB-ish spaces. |
| 753 | return max(0.0, min(1.0, $t->value)); |
| 754 | } |
| 755 | if ($t instanceof PercentageToken) { |
| 756 | return max(0.0, min(1.0, $t->value / 100.0)); |
| 757 | } |
| 758 | return null; |
| 759 | } |
| 760 | |
| 761 | // ============================================================ |
| 762 | // calc() / min() / max() / clamp() / sin() / cos() / ... |
| 763 | // ============================================================ |
| 764 | /** @param list<Token> $tokens */ |
| 765 | private function parseCalcFunction(CalcFunction $func, array $tokens): ?Calc |
| 766 | { |
| 767 | $tokens = self::trimWhitespace($tokens); |
| 768 | if ($func === CalcFunction::Calc) { |
| 769 | $expr = $this->parseCalcSum($tokens); |
| 770 | if ($expr === null) { |
| 771 | return null; |
| 772 | } |
| 773 | return new Calc($expr); |
| 774 | } |
| 775 | // Multi-argument math functions: comma-separated arguments. |
| 776 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 777 | $args = []; |
| 778 | foreach ($groups as $group) { |
| 779 | $expr = $this->parseCalcSum(self::trimWhitespace($group)); |
| 780 | if ($expr === null) { |
| 781 | return null; |
| 782 | } |
| 783 | $args[] = $expr; |
| 784 | } |
| 785 | return new Calc(new CalcFunc($func, $args)); |
| 786 | } |
| 787 | |
| 788 | /** |
| 789 | * Parse a calc-sum expression: product (('+' | '-') product)*. Per CSS |
| 790 | * Values 4 the +/- operators MUST have whitespace on both sides; the |
| 791 | * tokenizer guarantees this by greedily consuming `+2`/`-2` as signed |
| 792 | * numbers when there's no whitespace. |
| 793 | * |
| 794 | * @param list<Token> $tokens |
| 795 | */ |
| 796 | private function parseCalcSum(array $tokens): ?CalcExpression |
| 797 | { |
| 798 | $tokens = self::trimWhitespace($tokens); |
| 799 | if ($tokens === []) { |
| 800 | return null; |
| 801 | } |
| 802 | // Split on top-level +/- delim tokens. |
| 803 | $parts = []; // alternating: [expr, op, expr, op, ...] |
| 804 | $current = []; |
| 805 | $depth = 0; |
| 806 | foreach ($tokens as $t) { |
| 807 | if ($depth === 0 && $t instanceof DelimToken && ($t->value === '+' || $t->value === '-')) { |
| 808 | $parts[] = self::trimWhitespace($current); |
| 809 | $parts[] = $t->value; |
| 810 | $current = []; |
| 811 | continue; |
| 812 | } |
| 813 | $cls = $t::class; |
| 814 | if (str_ends_with($cls, '\\LeftParenToken') || $t instanceof FunctionToken) { |
| 815 | $depth++; |
| 816 | } elseif (str_ends_with($cls, '\\RightParenToken')) { |
| 817 | if ($depth > 0) { |
| 818 | $depth--; |
| 819 | } |
| 820 | } |
| 821 | $current[] = $t; |
| 822 | } |
| 823 | $parts[] = self::trimWhitespace($current); |
| 824 | |
| 825 | $left = $this->parseCalcProduct($parts[0]); |
| 826 | if ($left === null) { |
| 827 | return null; |
| 828 | } |
| 829 | for ($i = 1; $i < count($parts); $i += 2) { |
| 830 | $op = $parts[$i] === '+' ? CalcOp::Add : CalcOp::Sub; |
| 831 | $right = $this->parseCalcProduct($parts[$i + 1] ?? []); |
| 832 | if ($right === null) { |
| 833 | return null; |
| 834 | } |
| 835 | $left = new CalcBinary($left, $op, $right); |
| 836 | } |
| 837 | return $left; |
| 838 | } |
| 839 | |
| 840 | /** @param list<Token> $tokens */ |
| 841 | private function parseCalcProduct(array $tokens): ?CalcExpression |
| 842 | { |
| 843 | $tokens = self::trimWhitespace($tokens); |
| 844 | if ($tokens === []) { |
| 845 | return null; |
| 846 | } |
| 847 | $parts = []; |
| 848 | $current = []; |
| 849 | $depth = 0; |
| 850 | foreach ($tokens as $t) { |
| 851 | if ($depth === 0 && $t instanceof DelimToken && ($t->value === '*' || $t->value === '/')) { |
| 852 | $parts[] = self::trimWhitespace($current); |
| 853 | $parts[] = $t->value; |
| 854 | $current = []; |
| 855 | continue; |
| 856 | } |
| 857 | $cls = $t::class; |
| 858 | if (str_ends_with($cls, '\\LeftParenToken') || $t instanceof FunctionToken) { |
| 859 | $depth++; |
| 860 | } elseif (str_ends_with($cls, '\\RightParenToken')) { |
| 861 | if ($depth > 0) { |
| 862 | $depth--; |
| 863 | } |
| 864 | } |
| 865 | $current[] = $t; |
| 866 | } |
| 867 | $parts[] = self::trimWhitespace($current); |
| 868 | |
| 869 | $left = $this->parseCalcValue($parts[0]); |
| 870 | if ($left === null) { |
| 871 | return null; |
| 872 | } |
| 873 | for ($i = 1; $i < count($parts); $i += 2) { |
| 874 | $op = $parts[$i] === '*' ? CalcOp::Mul : CalcOp::Div; |
| 875 | $right = $this->parseCalcValue($parts[$i + 1] ?? []); |
| 876 | if ($right === null) { |
| 877 | return null; |
| 878 | } |
| 879 | $left = new CalcBinary($left, $op, $right); |
| 880 | } |
| 881 | return $left; |
| 882 | } |
| 883 | |
| 884 | /** @param list<Token> $tokens */ |
| 885 | private function parseCalcValue(array $tokens): ?CalcExpression |
| 886 | { |
| 887 | $tokens = self::trimWhitespace($tokens); |
| 888 | if ($tokens === []) { |
| 889 | return null; |
| 890 | } |
| 891 | // Parenthesised expression — strip a balanced outer pair. |
| 892 | $head = $tokens[0]; |
| 893 | $last = $tokens[count($tokens) - 1]; |
| 894 | if ($this->isMatchingParenWrap($tokens)) { |
| 895 | return $this->parseCalcSum(array_slice($tokens, 1, count($tokens) - 2)); |
| 896 | } |
| 897 | // Inline math function — e.g. nested calc, min, max. |
| 898 | if ($head instanceof FunctionToken && $last instanceof RightParenToken && count($tokens) >= 2) { |
| 899 | $inner = array_slice($tokens, 1, count($tokens) - 2); |
| 900 | $name = strtolower($head->name); |
| 901 | $func = CalcFunction::tryFrom($name); |
| 902 | if ($func === CalcFunction::Calc) { |
| 903 | return $this->parseCalcSum($inner); |
| 904 | } |
| 905 | if ($func !== null) { |
| 906 | $groups = self::splitTopLevel($inner, CommaToken::class); |
| 907 | $args = []; |
| 908 | foreach ($groups as $g) { |
| 909 | $expr = $this->parseCalcSum(self::trimWhitespace($g)); |
| 910 | if ($expr === null) { |
| 911 | return null; |
| 912 | } |
| 913 | $args[] = $expr; |
| 914 | } |
| 915 | return new CalcFunc($func, $args); |
| 916 | } |
| 917 | return null; |
| 918 | } |
| 919 | // Single primitive value. |
| 920 | if (count($tokens) === 1) { |
| 921 | $value = $this->parseSingle($tokens); |
| 922 | if ($value instanceof Number || $value instanceof Integer |
| 923 | || $value instanceof Length || $value instanceof Percentage |
| 924 | || $value instanceof Angle |
| 925 | ) { |
| 926 | return new CalcLeaf($value); |
| 927 | } |
| 928 | } |
| 929 | return null; |
| 930 | } |
| 931 | |
| 932 | /** @param list<Token> $tokens */ |
| 933 | private function isMatchingParenWrap(array $tokens): bool |
| 934 | { |
| 935 | if (count($tokens) < 2) { |
| 936 | return false; |
| 937 | } |
| 938 | $head = $tokens[0]; |
| 939 | $last = $tokens[count($tokens) - 1]; |
| 940 | if (!str_ends_with($head::class, '\\LeftParenToken')) { |
| 941 | return false; |
| 942 | } |
| 943 | if (!str_ends_with($last::class, '\\RightParenToken')) { |
| 944 | return false; |
| 945 | } |
| 946 | // Walk to verify the leading paren matches the trailing one (not |
| 947 | // a separate nested pair). |
| 948 | $depth = 0; |
| 949 | $matched = -1; |
| 950 | foreach ($tokens as $i => $t) { |
| 951 | if (str_ends_with($t::class, '\\LeftParenToken') || $t instanceof FunctionToken) { |
| 952 | $depth++; |
| 953 | } elseif (str_ends_with($t::class, '\\RightParenToken')) { |
| 954 | $depth--; |
| 955 | if ($depth === 0) { |
| 956 | $matched = $i; |
| 957 | break; |
| 958 | } |
| 959 | } |
| 960 | } |
| 961 | return $matched === count($tokens) - 1; |
| 962 | } |
| 963 | |
| 964 | // ============================================================ |
| 965 | // linear-gradient / radial-gradient |
| 966 | // ============================================================ |
| 967 | /** @param list<Token> $tokens */ |
| 968 | private function parseLinearGradient(array $tokens, bool $repeating): ?LinearGradient |
| 969 | { |
| 970 | $tokens = self::trimWhitespace($tokens); |
| 971 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 972 | if (count($groups) < 2) { |
| 973 | return null; |
| 974 | } |
| 975 | // First group may be the angle/side spec, or directly a colour stop. |
| 976 | $first = self::trimWhitespace($groups[0]); |
| 977 | $angleDeg = 180.0; // default: top → bottom |
| 978 | $stopGroups = $groups; |
| 979 | $maybeAngle = $this->parseLinearAngleHeader($first); |
| 980 | if ($maybeAngle !== null) { |
| 981 | $angleDeg = $maybeAngle; |
| 982 | $stopGroups = array_slice($groups, 1); |
| 983 | } |
| 984 | $stops = []; |
| 985 | foreach ($stopGroups as $g) { |
| 986 | $stop = $this->parseGradientStop($g); |
| 987 | if ($stop === null) { |
| 988 | return null; |
| 989 | } |
| 990 | $stops[] = $stop; |
| 991 | } |
| 992 | if (count($stops) < 2) { |
| 993 | return null; |
| 994 | } |
| 995 | return new LinearGradient($angleDeg, $stops, $repeating); |
| 996 | } |
| 997 | |
| 998 | /** |
| 999 | * Parse `<angle>` or `to <side-or-corner>` into degrees, or null if the |
| 1000 | * first comma-group is actually a colour stop. |
| 1001 | * |
| 1002 | * @param list<Token> $tokens |
| 1003 | */ |
| 1004 | private function parseLinearAngleHeader(array $tokens): ?float |
| 1005 | { |
| 1006 | $tokens = self::trimWhitespace($tokens); |
| 1007 | if ($tokens === []) { |
| 1008 | return null; |
| 1009 | } |
| 1010 | $head = $tokens[0]; |
| 1011 | // Direct angle: e.g. `45deg`, `0.25turn`. |
| 1012 | if ($head instanceof DimensionToken) { |
| 1013 | $unit = AngleUnit::tryFrom(strtolower($head->unit)); |
| 1014 | if ($unit !== null) { |
| 1015 | return $unit->toDegrees($head->value); |
| 1016 | } |
| 1017 | } |
| 1018 | // `to <side> [<side>]`. |
| 1019 | if ($head instanceof IdentToken && strtolower($head->value) === 'to') { |
| 1020 | $sides = []; |
| 1021 | for ($i = 1; $i < count($tokens); $i++) { |
| 1022 | if ($tokens[$i] instanceof WhitespaceToken) { |
| 1023 | continue; |
| 1024 | } |
| 1025 | if ($tokens[$i] instanceof IdentToken) { |
| 1026 | $sides[] = strtolower($tokens[$i]->value); |
| 1027 | } |
| 1028 | } |
| 1029 | return self::sidesToAngle($sides); |
| 1030 | } |
| 1031 | return null; |
| 1032 | } |
| 1033 | |
| 1034 | /** @param list<string> $sides */ |
| 1035 | private static function sidesToAngle(array $sides): float |
| 1036 | { |
| 1037 | // Per spec table. |
| 1038 | sort($sides); |
| 1039 | $key = implode(' ', $sides); |
| 1040 | return match ($key) { |
| 1041 | 'top' => 0.0, |
| 1042 | 'right top', 'top right' => 45.0, |
| 1043 | 'right' => 90.0, |
| 1044 | 'bottom right', 'right bottom' => 135.0, |
| 1045 | 'bottom' => 180.0, |
| 1046 | 'bottom left', 'left bottom' => 225.0, |
| 1047 | 'left' => 270.0, |
| 1048 | 'left top', 'top left' => 315.0, |
| 1049 | default => 180.0, |
| 1050 | }; |
| 1051 | } |
| 1052 | |
| 1053 | /** @param list<Token> $tokens */ |
| 1054 | private function parseGradientStop(array $tokens): ?GradientStop |
| 1055 | { |
| 1056 | $tokens = self::trimWhitespace($tokens); |
| 1057 | if ($tokens === []) { |
| 1058 | return null; |
| 1059 | } |
| 1060 | // Split by whitespace: <color> [<position>] |
| 1061 | $parts = self::splitOnWhitespace($tokens); |
| 1062 | if (count($parts) === 0) { |
| 1063 | return null; |
| 1064 | } |
| 1065 | $colorValue = $this->parseSingle($parts[0]); |
| 1066 | if (!$colorValue instanceof Color) { |
| 1067 | return null; |
| 1068 | } |
| 1069 | $position = null; |
| 1070 | if (count($parts) >= 2) { |
| 1071 | $posVal = $this->parseSingle($parts[1]); |
| 1072 | if ($posVal instanceof Length || $posVal instanceof Percentage) { |
| 1073 | $position = $posVal; |
| 1074 | } |
| 1075 | } |
| 1076 | return new GradientStop($colorValue, $position); |
| 1077 | } |
| 1078 | |
| 1079 | /** @param list<Token> $tokens */ |
| 1080 | private function parseRadialGradient(array $tokens, bool $repeating): ?RadialGradient |
| 1081 | { |
| 1082 | $tokens = self::trimWhitespace($tokens); |
| 1083 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 1084 | if (count($groups) < 2) { |
| 1085 | return null; |
| 1086 | } |
| 1087 | // First group MAY be shape/size [at position]; otherwise it's a stop. |
| 1088 | $first = self::trimWhitespace($groups[0]); |
| 1089 | $shape = GradientShape::Ellipse; |
| 1090 | $sizeX = null; |
| 1091 | $sizeY = null; |
| 1092 | $centerX = null; |
| 1093 | $centerY = null; |
| 1094 | $stopGroups = $groups; |
| 1095 | if ($this->isRadialHeader($first)) { |
| 1096 | [$shape, $sizeX, $sizeY, $centerX, $centerY] = $this->parseRadialHeader($first); |
| 1097 | $stopGroups = array_slice($groups, 1); |
| 1098 | } |
| 1099 | $stops = []; |
| 1100 | foreach ($stopGroups as $g) { |
| 1101 | $stop = $this->parseGradientStop($g); |
| 1102 | if ($stop === null) { |
| 1103 | return null; |
| 1104 | } |
| 1105 | $stops[] = $stop; |
| 1106 | } |
| 1107 | if (count($stops) < 2) { |
| 1108 | return null; |
| 1109 | } |
| 1110 | return new RadialGradient($shape, $sizeX, $sizeY, $centerX, $centerY, $stops, $repeating); |
| 1111 | } |
| 1112 | |
| 1113 | /** @param list<Token> $tokens */ |
| 1114 | private function isRadialHeader(array $tokens): bool |
| 1115 | { |
| 1116 | foreach ($tokens as $t) { |
| 1117 | if ($t instanceof IdentToken |
| 1118 | && in_array(strtolower($t->value), ['circle', 'ellipse', 'at', 'closest-side', 'closest-corner', 'farthest-side', 'farthest-corner'], true) |
| 1119 | ) { |
| 1120 | return true; |
| 1121 | } |
| 1122 | } |
| 1123 | return false; |
| 1124 | } |
| 1125 | |
| 1126 | /** |
| 1127 | * @param list<Token> $tokens |
| 1128 | * @return array{0: GradientShape, 1: ?Length, 2: ?Length, 3: ?Length, 4: ?Length} |
| 1129 | */ |
| 1130 | private function parseRadialHeader(array $tokens): array |
| 1131 | { |
| 1132 | $shape = GradientShape::Ellipse; |
| 1133 | $sizeX = null; |
| 1134 | $sizeY = null; |
| 1135 | $centerX = null; |
| 1136 | $centerY = null; |
| 1137 | $atIdx = null; |
| 1138 | foreach ($tokens as $i => $t) { |
| 1139 | if ($t instanceof IdentToken && strtolower($t->value) === 'at') { |
| 1140 | $atIdx = $i; |
| 1141 | break; |
| 1142 | } |
| 1143 | } |
| 1144 | $headerPart = $atIdx !== null ? array_slice($tokens, 0, $atIdx) : $tokens; |
| 1145 | foreach (self::splitOnWhitespace($headerPart) as $piece) { |
| 1146 | $piece = self::trimWhitespace($piece); |
| 1147 | if ($piece === []) { |
| 1148 | continue; |
| 1149 | } |
| 1150 | $head = $piece[0]; |
| 1151 | if ($head instanceof IdentToken) { |
| 1152 | $name = strtolower($head->value); |
| 1153 | if ($name === 'circle') { |
| 1154 | $shape = GradientShape::Circle; |
| 1155 | } elseif ($name === 'ellipse') { |
| 1156 | $shape = GradientShape::Ellipse; |
| 1157 | } |
| 1158 | // closest-side etc. are sizing keywords; ignored for now. |
| 1159 | } elseif ($head instanceof DimensionToken) { |
| 1160 | $val = $this->parseSingle($piece); |
| 1161 | if ($val instanceof Length) { |
| 1162 | if ($sizeX === null) { |
| 1163 | $sizeX = $val; |
| 1164 | } else { |
| 1165 | $sizeY = $val; |
| 1166 | } |
| 1167 | } |
| 1168 | } |
| 1169 | } |
| 1170 | if ($atIdx !== null) { |
| 1171 | $positionPart = array_slice($tokens, $atIdx + 1); |
| 1172 | $positions = []; |
| 1173 | foreach (self::splitOnWhitespace($positionPart) as $piece) { |
| 1174 | $piece = self::trimWhitespace($piece); |
| 1175 | if ($piece === []) { |
| 1176 | continue; |
| 1177 | } |
| 1178 | $val = $this->parseSingle($piece); |
| 1179 | if ($val instanceof Length) { |
| 1180 | $positions[] = $val; |
| 1181 | } |
| 1182 | } |
| 1183 | $centerX = $positions[0] ?? null; |
| 1184 | $centerY = $positions[1] ?? null; |
| 1185 | } |
| 1186 | return [$shape, $sizeX, $sizeY, $centerX, $centerY]; |
| 1187 | } |
| 1188 | |
| 1189 | // ============================================================ |
| 1190 | // Token-stream utilities |
| 1191 | // ============================================================ |
| 1192 | |
| 1193 | /** @param list<Token> $tokens |
| 1194 | * @return list<Token> |
| 1195 | */ |
| 1196 | private static function trimWhitespace(array $tokens): array |
| 1197 | { |
| 1198 | $start = 0; |
| 1199 | $end = count($tokens) - 1; |
| 1200 | while ($start <= $end && ($tokens[$start] instanceof WhitespaceToken || $tokens[$start] instanceof EofToken)) { |
| 1201 | $start++; |
| 1202 | } |
| 1203 | while ($end >= $start && ($tokens[$end] instanceof WhitespaceToken || $tokens[$end] instanceof EofToken)) { |
| 1204 | $end--; |
| 1205 | } |
| 1206 | return array_slice($tokens, $start, $end - $start + 1); |
| 1207 | } |
| 1208 | |
| 1209 | /** |
| 1210 | * Split a flat token list at top-level instances of $separator (i.e. |
| 1211 | * outside any nested parens / brackets). |
| 1212 | * |
| 1213 | * @param list<Token> $tokens |
| 1214 | * @param class-string<Token> $separator |
| 1215 | * @return list<list<Token>> |
| 1216 | */ |
| 1217 | private static function splitTopLevel(array $tokens, string $separator): array |
| 1218 | { |
| 1219 | $groups = []; |
| 1220 | $current = []; |
| 1221 | $depth = 0; |
| 1222 | foreach ($tokens as $t) { |
| 1223 | $cls = $t::class; |
| 1224 | if ($depth === 0 && $cls === $separator) { |
| 1225 | $groups[] = $current; |
| 1226 | $current = []; |
| 1227 | continue; |
| 1228 | } |
| 1229 | if (str_ends_with($cls, '\\LeftParenToken') |
| 1230 | || str_ends_with($cls, '\\LeftBracketToken') |
| 1231 | || str_ends_with($cls, '\\LeftBraceToken') |
| 1232 | || $t instanceof FunctionToken |
| 1233 | ) { |
| 1234 | $depth++; |
| 1235 | } elseif (str_ends_with($cls, '\\RightParenToken') |
| 1236 | || str_ends_with($cls, '\\RightBracketToken') |
| 1237 | || str_ends_with($cls, '\\RightBraceToken') |
| 1238 | ) { |
| 1239 | if ($depth > 0) { |
| 1240 | $depth--; |
| 1241 | } |
| 1242 | } |
| 1243 | $current[] = $t; |
| 1244 | } |
| 1245 | $groups[] = $current; |
| 1246 | return $groups; |
| 1247 | } |
| 1248 | |
| 1249 | /** |
| 1250 | * Like {@see splitTopLevel} but splits on a specific `DelimToken` value |
| 1251 | * (typically `/` for the slash-shorthand pattern). |
| 1252 | * |
| 1253 | * @param list<Token> $tokens |
| 1254 | * @return list<list<Token>> |
| 1255 | */ |
| 1256 | private static function splitTopLevelDelim(array $tokens, string $delim): array |
| 1257 | { |
| 1258 | $groups = []; |
| 1259 | $current = []; |
| 1260 | $depth = 0; |
| 1261 | foreach ($tokens as $t) { |
| 1262 | if ($depth === 0 && $t instanceof DelimToken && $t->value === $delim) { |
| 1263 | $groups[] = $current; |
| 1264 | $current = []; |
| 1265 | continue; |
| 1266 | } |
| 1267 | if ($t instanceof LeftParenToken |
| 1268 | || $t instanceof LeftBracketToken |
| 1269 | || $t instanceof LeftBraceToken |
| 1270 | || $t instanceof FunctionToken |
| 1271 | ) { |
| 1272 | $depth++; |
| 1273 | } elseif ($t instanceof RightParenToken |
| 1274 | || $t instanceof RightBracketToken |
| 1275 | || $t instanceof RightBraceToken |
| 1276 | ) { |
| 1277 | if ($depth > 0) { |
| 1278 | $depth--; |
| 1279 | } |
| 1280 | } |
| 1281 | $current[] = $t; |
| 1282 | } |
| 1283 | $groups[] = $current; |
| 1284 | return $groups; |
| 1285 | } |
| 1286 | |
| 1287 | /** @param list<Token> $tokens |
| 1288 | * @return list<list<Token>> |
| 1289 | */ |
| 1290 | private static function splitOnWhitespace(array $tokens): array |
| 1291 | { |
| 1292 | $groups = []; |
| 1293 | $current = []; |
| 1294 | $depth = 0; |
| 1295 | foreach ($tokens as $t) { |
| 1296 | if ($depth === 0 && $t instanceof WhitespaceToken) { |
| 1297 | if ($current !== []) { |
| 1298 | $groups[] = $current; |
| 1299 | $current = []; |
| 1300 | } |
| 1301 | continue; |
| 1302 | } |
| 1303 | $cls = $t::class; |
| 1304 | if (str_ends_with($cls, '\\LeftParenToken') |
| 1305 | || str_ends_with($cls, '\\LeftBracketToken') |
| 1306 | || str_ends_with($cls, '\\LeftBraceToken') |
| 1307 | || $t instanceof FunctionToken |
| 1308 | ) { |
| 1309 | $depth++; |
| 1310 | } elseif (str_ends_with($cls, '\\RightParenToken') |
| 1311 | || str_ends_with($cls, '\\RightBracketToken') |
| 1312 | || str_ends_with($cls, '\\RightBraceToken') |
| 1313 | ) { |
| 1314 | if ($depth > 0) { |
| 1315 | $depth--; |
| 1316 | } |
| 1317 | } |
| 1318 | $current[] = $t; |
| 1319 | } |
| 1320 | if ($current !== []) { |
| 1321 | $groups[] = $current; |
| 1322 | } |
| 1323 | return $groups; |
| 1324 | } |
| 1325 | } |