Code Coverage |
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Lines |
Functions and Methods |
Classes and Traits |
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| Total | |
83.66% |
1823 / 2179 |
|
19.49% |
23 / 118 |
CRAP | |
0.00% |
0 / 1 |
| ValueParser | |
83.66% |
1823 / 2179 |
|
19.49% |
23 / 118 |
6355.54 | |
0.00% |
0 / 1 |
| parseFromString | |
100.00% |
2 / 2 |
|
100.00% |
1 / 1 |
1 | |||
| parse | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
2 | |||
| parseSlashList | |
100.00% |
5 / 5 |
|
100.00% |
1 / 1 |
2 | |||
| parseSpaceList | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
2 | |||
| parseSingle | |
93.02% |
40 / 43 |
|
0.00% |
0 / 1 |
18.11 | |||
| parseFunction | |
98.32% |
117 / 119 |
|
0.00% |
0 / 1 |
72 | |||
| parseTransform | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| postProcessTransform | |
90.00% |
9 / 10 |
|
0.00% |
0 / 1 |
5.03 | |||
| parseFilter | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| postProcessFilter | |
85.71% |
12 / 14 |
|
0.00% |
0 / 1 |
8.19 | |||
| postProcessFontFeatureSettings | |
81.25% |
13 / 16 |
|
0.00% |
0 / 1 |
9.53 | |||
| postProcessFontVariationSettings | |
81.25% |
13 / 16 |
|
0.00% |
0 / 1 |
9.53 | |||
| parseFontVariationEntry | |
75.00% |
9 / 12 |
|
0.00% |
0 / 1 |
7.77 | |||
| parseFontFeatureEntry | |
68.00% |
17 / 25 |
|
0.00% |
0 / 1 |
20.42 | |||
| valueToFilterFunction | |
87.50% |
7 / 8 |
|
0.00% |
0 / 1 |
4.03 | |||
| valueToTransformFunction | |
70.73% |
29 / 41 |
|
0.00% |
0 / 1 |
80.12 | |||
| buildTranslate | |
41.67% |
5 / 12 |
|
0.00% |
0 / 1 |
16.73 | |||
| buildRotate3d | |
0.00% |
0 / 8 |
|
0.00% |
0 / 1 |
6 | |||
| buildScale | |
83.33% |
5 / 6 |
|
0.00% |
0 / 1 |
3.04 | |||
| buildSkew | |
60.00% |
3 / 5 |
|
0.00% |
0 / 1 |
3.58 | |||
| toLengthOrPct | |
28.57% |
2 / 7 |
|
0.00% |
0 / 1 |
19.12 | |||
| toAngleDeg | |
40.00% |
2 / 5 |
|
0.00% |
0 / 1 |
10.40 | |||
| toFloat | |
66.67% |
2 / 3 |
|
0.00% |
0 / 1 |
4.59 | |||
| parseArgs | |
100.00% |
2 / 2 |
|
100.00% |
1 / 1 |
1 | |||
| parseRgbFunction | |
95.24% |
20 / 21 |
|
0.00% |
0 / 1 |
8 | |||
| extractRgbComponent | |
88.89% |
8 / 9 |
|
0.00% |
0 / 1 |
4.02 | |||
| extractAlphaComponent | |
55.56% |
5 / 9 |
|
0.00% |
0 / 1 |
5.40 | |||
| splitRgbSpaceForm | |
88.24% |
15 / 17 |
|
0.00% |
0 / 1 |
8.10 | |||
| splitOnSlash | |
68.42% |
13 / 19 |
|
0.00% |
0 / 1 |
10.02 | |||
| parseHslFunction | |
81.25% |
13 / 16 |
|
0.00% |
0 / 1 |
9.53 | |||
| parseHwbFunction | |
0.00% |
0 / 27 |
|
0.00% |
0 / 1 |
90 | |||
| extractHueComponent | |
57.89% |
11 / 19 |
|
0.00% |
0 / 1 |
22.75 | |||
| extractPercentageComponent | |
66.67% |
6 / 9 |
|
0.00% |
0 / 1 |
5.93 | |||
| hslToRgb | |
86.36% |
19 / 22 |
|
0.00% |
0 / 1 |
8.16 | |||
| parseHexColor | |
74.07% |
20 / 27 |
|
0.00% |
0 / 1 |
6.63 | |||
| parseVarFunction | |
78.57% |
11 / 14 |
|
0.00% |
0 / 1 |
7.48 | |||
| parseColorFunction | |
70.27% |
26 / 37 |
|
0.00% |
0 / 1 |
39.14 | |||
| extractColorComponent | |
83.33% |
10 / 12 |
|
0.00% |
0 / 1 |
6.17 | |||
| parseLabFunction | |
84.78% |
39 / 46 |
|
0.00% |
0 / 1 |
26.03 | |||
| extractLabLightness | |
81.82% |
9 / 11 |
|
0.00% |
0 / 1 |
7.29 | |||
| extractLabAxisComponent | |
90.91% |
10 / 11 |
|
0.00% |
0 / 1 |
6.03 | |||
| extractChromaComponent | |
72.73% |
8 / 11 |
|
0.00% |
0 / 1 |
6.73 | |||
| extractLabHueComponent | |
68.42% |
13 / 19 |
|
0.00% |
0 / 1 |
16.53 | |||
| normaliseHueDegrees | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| parseRelativeColorIfPresent | |
85.71% |
6 / 7 |
|
0.00% |
0 / 1 |
4.05 | |||
| parseRelativeColorBody | |
76.19% |
48 / 63 |
|
0.00% |
0 / 1 |
57.49 | |||
| splitParenAwareSpaceForm | |
84.62% |
22 / 26 |
|
0.00% |
0 / 1 |
13.62 | |||
| collectColorRun | |
75.00% |
6 / 8 |
|
0.00% |
0 / 1 |
5.39 | |||
| parseRelativeComponent | |
71.43% |
5 / 7 |
|
0.00% |
0 / 1 |
3.21 | |||
| parseColorMixFunction | |
95.00% |
38 / 40 |
|
0.00% |
0 / 1 |
10 | |||
| parseColorMixMethod | |
70.00% |
35 / 50 |
|
0.00% |
0 / 1 |
70.99 | |||
| parseColorMixColorAndPercent | |
75.00% |
12 / 16 |
|
0.00% |
0 / 1 |
7.77 | |||
| parseColorFromTokens | |
83.33% |
5 / 6 |
|
0.00% |
0 / 1 |
3.04 | |||
| serializeTokens | |
100.00% |
17 / 17 |
|
100.00% |
1 / 1 |
16 | |||
| parseCalcFunction | |
92.86% |
13 / 14 |
|
0.00% |
0 / 1 |
5.01 | |||
| parseCalcSum | |
93.33% |
28 / 30 |
|
0.00% |
0 / 1 |
15.07 | |||
| parseCalcProduct | |
93.33% |
28 / 30 |
|
0.00% |
0 / 1 |
15.07 | |||
| parseCalcValue | |
86.67% |
26 / 30 |
|
0.00% |
0 / 1 |
16.61 | |||
| isMatchingParenWrap | |
94.74% |
18 / 19 |
|
0.00% |
0 / 1 |
9.01 | |||
| parseLinearGradient | |
88.37% |
38 / 43 |
|
0.00% |
0 / 1 |
11.19 | |||
| splitOnInterpolationKeyword | |
70.00% |
14 / 20 |
|
0.00% |
0 / 1 |
14.27 | |||
| parseLinearAngleHeader | |
94.12% |
16 / 17 |
|
0.00% |
0 / 1 |
9.02 | |||
| sidesToAngle | |
50.00% |
6 / 12 |
|
0.00% |
0 / 1 |
22.50 | |||
| parseGradientStop | |
84.21% |
16 / 19 |
|
0.00% |
0 / 1 |
6.14 | |||
| parseStopPosition | |
70.00% |
7 / 10 |
|
0.00% |
0 / 1 |
9.73 | |||
| parseRadialGradient | |
89.58% |
43 / 48 |
|
0.00% |
0 / 1 |
12.16 | |||
| parseConicGradient | |
88.00% |
44 / 50 |
|
0.00% |
0 / 1 |
14.34 | |||
| isConicHeader | |
100.00% |
5 / 5 |
|
100.00% |
1 / 1 |
4 | |||
| parseConicHeader | |
85.00% |
51 / 60 |
|
0.00% |
0 / 1 |
27.11 | |||
| parseAnchorFunction | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
1 | |||
| parseAnchorSizeFunction | |
100.00% |
5 / 5 |
|
100.00% |
1 / 1 |
1 | |||
| parseAnchorOrSize | |
90.62% |
29 / 32 |
|
0.00% |
0 / 1 |
15.19 | |||
| parseBasicShape | |
100.00% |
9 / 9 |
|
100.00% |
1 / 1 |
9 | |||
| parseRectShape | |
91.30% |
21 / 23 |
|
0.00% |
0 / 1 |
10.07 | |||
| parseXywhShape | |
86.36% |
19 / 22 |
|
0.00% |
0 / 1 |
8.16 | |||
| parsePathShape | |
89.47% |
17 / 19 |
|
0.00% |
0 / 1 |
9.09 | |||
| parseCircleShape | |
88.89% |
8 / 9 |
|
0.00% |
0 / 1 |
5.03 | |||
| parseEllipseShape | |
93.75% |
15 / 16 |
|
0.00% |
0 / 1 |
6.01 | |||
| parseInsetShape | |
90.91% |
20 / 22 |
|
0.00% |
0 / 1 |
9.06 | |||
| parsePolygonShape | |
86.67% |
26 / 30 |
|
0.00% |
0 / 1 |
13.40 | |||
| isShapePositionValue | |
100.00% |
5 / 5 |
|
100.00% |
1 / 1 |
5 | |||
| parseShapeRadius | |
81.82% |
9 / 11 |
|
0.00% |
0 / 1 |
9.49 | |||
| parsePositionXY | |
90.00% |
18 / 20 |
|
0.00% |
0 / 1 |
9.08 | |||
| splitOnAtKeyword | |
71.43% |
10 / 14 |
|
0.00% |
0 / 1 |
9.49 | |||
| splitOnRoundKeyword | |
71.43% |
10 / 14 |
|
0.00% |
0 / 1 |
9.49 | |||
| parseCubicBezierFunction | |
92.31% |
12 / 13 |
|
0.00% |
0 / 1 |
9.04 | |||
| parseStepsFunction | |
85.71% |
18 / 21 |
|
0.00% |
0 / 1 |
11.35 | |||
| parseLinearEasingFunction | |
90.62% |
29 / 32 |
|
0.00% |
0 / 1 |
13.14 | |||
| extractSinglePercentage | |
66.67% |
4 / 6 |
|
0.00% |
0 / 1 |
3.33 | |||
| parseAttrFunction | |
95.00% |
19 / 20 |
|
0.00% |
0 / 1 |
8 | |||
| parseEnvFunction | |
88.00% |
22 / 25 |
|
0.00% |
0 / 1 |
10.17 | |||
| parseTargetFunction | |
80.00% |
8 / 10 |
|
0.00% |
0 / 1 |
6.29 | |||
| buildTargetCounter | |
81.82% |
9 / 11 |
|
0.00% |
0 / 1 |
6.22 | |||
| buildTargetCounters | |
86.67% |
13 / 15 |
|
0.00% |
0 / 1 |
8.15 | |||
| buildTargetText | |
83.33% |
10 / 12 |
|
0.00% |
0 / 1 |
7.23 | |||
| parseCounterIdent | |
75.00% |
3 / 4 |
|
0.00% |
0 / 1 |
3.14 | |||
| parseStringFunction | |
94.12% |
16 / 17 |
|
0.00% |
0 / 1 |
9.02 | |||
| parseViewTimeline | |
90.91% |
20 / 22 |
|
0.00% |
0 / 1 |
11.09 | |||
| parseScrollTimeline | |
94.74% |
18 / 19 |
|
0.00% |
0 / 1 |
9.01 | |||
| parsePaintFunction | |
90.91% |
10 / 11 |
|
0.00% |
0 / 1 |
5.02 | |||
| parseElementFunction | |
94.12% |
16 / 17 |
|
0.00% |
0 / 1 |
9.02 | |||
| parseDeviceCmyk | |
85.29% |
29 / 34 |
|
0.00% |
0 / 1 |
14.62 | |||
| parseCmykComponent | |
88.89% |
8 / 9 |
|
0.00% |
0 / 1 |
4.02 | |||
| parseContrastColor | |
80.00% |
4 / 5 |
|
0.00% |
0 / 1 |
2.03 | |||
| parseCrossFade | |
83.33% |
10 / 12 |
|
0.00% |
0 / 1 |
5.12 | |||
| parseCrossFadeEntry | |
93.75% |
15 / 16 |
|
0.00% |
0 / 1 |
8.02 | |||
| parseLightDark | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
2 | |||
| parseImageSet | |
100.00% |
11 / 11 |
|
100.00% |
1 / 1 |
4 | |||
| parseImageSetOption | |
81.03% |
47 / 58 |
|
0.00% |
0 / 1 |
25.30 | |||
| collectFunctionLikeRun | |
84.62% |
11 / 13 |
|
0.00% |
0 / 1 |
7.18 | |||
| isResolutionUnit | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| resolutionToDppx | |
100.00% |
5 / 5 |
|
100.00% |
1 / 1 |
5 | |||
| isRadialHeader | |
100.00% |
5 / 5 |
|
100.00% |
1 / 1 |
4 | |||
| parseRadialHeader | |
75.61% |
31 / 41 |
|
0.00% |
0 / 1 |
21.19 | |||
| trimWhitespace | |
100.00% |
7 / 7 |
|
100.00% |
1 / 1 |
7 | |||
| splitTopLevel | |
100.00% |
22 / 22 |
|
100.00% |
1 / 1 |
12 | |||
| splitTopLevelDelim | |
100.00% |
21 / 21 |
|
100.00% |
1 / 1 |
13 | |||
| splitOnWhitespace | |
100.00% |
24 / 24 |
|
100.00% |
1 / 1 |
14 | |||
| 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\AnchorFunction; |
| 27 | use Phpdftk\Css\Value\AnchorSizeFunction; |
| 28 | use Phpdftk\Css\Value\AttrFunction; |
| 29 | use Phpdftk\Css\Value\BasicShape; |
| 30 | use Phpdftk\Css\Value\CircleShape; |
| 31 | use Phpdftk\Css\Value\EllipseShape; |
| 32 | use Phpdftk\Css\Value\EnvFunction; |
| 33 | use Phpdftk\Css\Value\InsetShape; |
| 34 | use Phpdftk\Css\Value\PathShape; |
| 35 | use Phpdftk\Css\Value\PolygonShape; |
| 36 | use Phpdftk\Css\Value\RectShape; |
| 37 | use Phpdftk\Css\Value\XywhShape; |
| 38 | use Phpdftk\Css\Value\Filter; |
| 39 | use Phpdftk\Css\Value\FontFeatureSettings; |
| 40 | use Phpdftk\Css\Value\FontFeatureValue; |
| 41 | use Phpdftk\Css\Value\FontVariationSettings; |
| 42 | use Phpdftk\Css\Value\FontVariationValue; |
| 43 | use Phpdftk\Css\Value\FilterFunction; |
| 44 | use Phpdftk\Css\Value\FilterKind; |
| 45 | use Phpdftk\Css\Value\Angle; |
| 46 | use Phpdftk\Css\Value\AngleUnit; |
| 47 | use Phpdftk\Css\Value\Calc; |
| 48 | use Phpdftk\Css\Value\CalcBinary; |
| 49 | use Phpdftk\Css\Value\CalcExpression; |
| 50 | use Phpdftk\Css\Value\CalcFunc; |
| 51 | use Phpdftk\Css\Value\CalcFunction; |
| 52 | use Phpdftk\Css\Value\CalcLeaf; |
| 53 | use Phpdftk\Css\Value\CalcOp; |
| 54 | use Phpdftk\Css\Value\Color; |
| 55 | use Phpdftk\Css\Value\ColorMix; |
| 56 | use Phpdftk\Css\Value\CubicBezier; |
| 57 | use Phpdftk\Css\Value\StepsEasing; |
| 58 | use Phpdftk\Css\Value\StepsJumpTerm; |
| 59 | use Phpdftk\Css\Value\HueInterpolation; |
| 60 | use Phpdftk\Css\Value\ColorSpace; |
| 61 | use Phpdftk\Css\Value\CssFunction; |
| 62 | use Phpdftk\Css\Value\CustomProperty; |
| 63 | use Phpdftk\Css\Value\DeviceCmyk; |
| 64 | use Phpdftk\Css\Value\ElementFunction; |
| 65 | use Phpdftk\Css\Value\Gradient; |
| 66 | use Phpdftk\Css\Value\ConicGradient; |
| 67 | use Phpdftk\Css\Value\ContrastColor; |
| 68 | use Phpdftk\Css\Value\CrossFade; |
| 69 | use Phpdftk\Css\Value\CrossFadeOption; |
| 70 | use Phpdftk\Css\Value\GradientShape; |
| 71 | use Phpdftk\Css\Value\GradientStop; |
| 72 | use Phpdftk\Css\Value\ImageSet; |
| 73 | use Phpdftk\Css\Value\ImageSetOption; |
| 74 | use Phpdftk\Css\Value\Integer; |
| 75 | use Phpdftk\Css\Value\Keyword; |
| 76 | use Phpdftk\Css\Value\Length; |
| 77 | use Phpdftk\Css\Value\LengthUnit; |
| 78 | use Phpdftk\Css\Value\LightDark; |
| 79 | use Phpdftk\Css\Value\LinearEasing; |
| 80 | use Phpdftk\Css\Value\LinearEasingStop; |
| 81 | use Phpdftk\Css\Value\LinearGradient; |
| 82 | use Phpdftk\Css\Value\ListSeparator; |
| 83 | use Phpdftk\Css\Value\MatrixTransform; |
| 84 | use Phpdftk\Css\Value\NamedColors; |
| 85 | use Phpdftk\Css\Value\Number; |
| 86 | use Phpdftk\Css\Value\PaintFunction; |
| 87 | use Phpdftk\Css\Value\Percentage; |
| 88 | use Phpdftk\Css\Value\RadialGradient; |
| 89 | use Phpdftk\Css\Value\RelativeColor; |
| 90 | use Phpdftk\Css\Value\ScrollTimeline; |
| 91 | use Phpdftk\Css\Value\RotateTransform; |
| 92 | use Phpdftk\Css\Value\ScaleTransform; |
| 93 | use Phpdftk\Css\Value\SkewTransform; |
| 94 | use Phpdftk\Css\Value\StringFunction; |
| 95 | use Phpdftk\Css\Value\StringValue; |
| 96 | use Phpdftk\Css\Value\TargetFunction; |
| 97 | use Phpdftk\Css\Value\TargetFunctionKind; |
| 98 | use Phpdftk\Css\Value\Time; |
| 99 | use Phpdftk\Css\Value\TimeUnit; |
| 100 | use Phpdftk\Css\Value\Transform; |
| 101 | use Phpdftk\Css\Value\TransformFunction; |
| 102 | use Phpdftk\Css\Value\TranslateTransform; |
| 103 | use Phpdftk\Css\Value\Url; |
| 104 | use Phpdftk\Css\Value\Value; |
| 105 | use Phpdftk\Css\Value\ViewTimeline; |
| 106 | use Phpdftk\Css\Value\ValueList; |
| 107 | |
| 108 | /** |
| 109 | * Parses a CSS token stream into typed Value instances per CSS Values 4. |
| 110 | * |
| 111 | * Phase 1A.2 covers the common path: keywords, numbers, integers, |
| 112 | * percentages, lengths (all units), colors (hex / named / rgb / rgba / |
| 113 | * hsl / hsla / transparent), strings, urls, single-argument function |
| 114 | * fallback. Calc, gradients, transforms, and color() with explicit space |
| 115 | * are deferred — they get dedicated parsers in 1A.2-bis. |
| 116 | */ |
| 117 | final class ValueParser |
| 118 | { |
| 119 | /** |
| 120 | * Parse the entire token stream as a single value. Whitespace-separated |
| 121 | * tokens become a `ValueList(Space)`; comma-separated become |
| 122 | * `ValueList(Comma)`. A lone value is returned bare. |
| 123 | */ |
| 124 | public function parseFromString(string $css): Value |
| 125 | { |
| 126 | $tokens = (new Tokenizer($css))->tokenize(); |
| 127 | return $this->parse($tokens); |
| 128 | } |
| 129 | |
| 130 | /** @param list<Token> $tokens */ |
| 131 | public function parse(array $tokens): Value |
| 132 | { |
| 133 | $tokens = self::trimWhitespace($tokens); |
| 134 | |
| 135 | // Split on top-level commas first. |
| 136 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 137 | if (count($commaGroups) > 1) { |
| 138 | $values = array_map(fn($g): Value => $this->parseSlashList($g), $commaGroups); |
| 139 | return new ValueList($values, ListSeparator::Comma); |
| 140 | } |
| 141 | return $this->parseSlashList($tokens); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Per CSS Values 4, `/` is a top-level separator inside a comma group |
| 146 | * for several shorthands (`font: 16px/1.5 sans-serif`, `border-radius: |
| 147 | * 4px / 8px`, `background: <bg-color> / <bg-size>` etc.). Splits the |
| 148 | * group on top-level `/` delims, then recurses into the space-list |
| 149 | * parser for each slash segment. |
| 150 | * |
| 151 | * @param list<Token> $tokens |
| 152 | */ |
| 153 | private function parseSlashList(array $tokens): Value |
| 154 | { |
| 155 | $slashGroups = self::splitTopLevelDelim($tokens, '/'); |
| 156 | if (count($slashGroups) > 1) { |
| 157 | $values = array_map(fn($g): Value => $this->parseSpaceList($g), $slashGroups); |
| 158 | return new ValueList($values, ListSeparator::Slash); |
| 159 | } |
| 160 | return $this->parseSpaceList($tokens); |
| 161 | } |
| 162 | |
| 163 | /** @param list<Token> $tokens */ |
| 164 | private function parseSpaceList(array $tokens): Value |
| 165 | { |
| 166 | $tokens = self::trimWhitespace($tokens); |
| 167 | $parts = self::splitOnWhitespace($tokens); |
| 168 | if (count($parts) === 1) { |
| 169 | return $this->parseSingle($parts[0]); |
| 170 | } |
| 171 | $values = array_map(fn($p): Value => $this->parseSingle($p), $parts); |
| 172 | return new ValueList($values, ListSeparator::Space); |
| 173 | } |
| 174 | |
| 175 | /** @param list<Token> $tokens A single value without separators. */ |
| 176 | private function parseSingle(array $tokens): Value |
| 177 | { |
| 178 | if ($tokens === []) { |
| 179 | return new Keyword(''); // shouldn't happen in well-formed input |
| 180 | } |
| 181 | $head = $tokens[0]; |
| 182 | if ($head instanceof IdentToken) { |
| 183 | $name = strtolower($head->value); |
| 184 | if ($name === 'transparent') { |
| 185 | return new Color(0, 0, 0, 0); |
| 186 | } |
| 187 | $named = NamedColors::lookup($name); |
| 188 | if ($named !== null) { |
| 189 | return $named; |
| 190 | } |
| 191 | return new Keyword($name); |
| 192 | } |
| 193 | if ($head instanceof HashToken) { |
| 194 | $color = $this->parseHexColor($head->value); |
| 195 | if ($color !== null) { |
| 196 | return $color; |
| 197 | } |
| 198 | return new Keyword('#' . $head->value); |
| 199 | } |
| 200 | if ($head instanceof NumberToken) { |
| 201 | return $head->type->name === 'Integer' |
| 202 | ? new Integer((int) $head->value) |
| 203 | : new Number($head->value); |
| 204 | } |
| 205 | if ($head instanceof PercentageToken) { |
| 206 | return new Percentage($head->value); |
| 207 | } |
| 208 | if ($head instanceof DimensionToken) { |
| 209 | $unit = strtolower($head->unit); |
| 210 | $lengthUnit = LengthUnit::tryFrom($unit); |
| 211 | if ($lengthUnit !== null) { |
| 212 | return new Length($head->value, $lengthUnit); |
| 213 | } |
| 214 | $angleUnit = AngleUnit::tryFrom($unit); |
| 215 | if ($angleUnit !== null) { |
| 216 | return new Angle($head->value, $angleUnit); |
| 217 | } |
| 218 | $timeUnit = TimeUnit::tryFrom($unit); |
| 219 | if ($timeUnit !== null) { |
| 220 | return new Time($head->value, $timeUnit); |
| 221 | } |
| 222 | // Unknown unit — fall back to a CssFunction representation so the |
| 223 | // value survives round-trip without being silently dropped. |
| 224 | return new CssFunction($head->unit, [new Number($head->value)]); |
| 225 | } |
| 226 | if ($head instanceof StringToken) { |
| 227 | return new StringValue($head->value); |
| 228 | } |
| 229 | if ($head instanceof UrlToken) { |
| 230 | return new Url($head->value); |
| 231 | } |
| 232 | if ($head instanceof FunctionToken) { |
| 233 | return $this->parseFunction($head->name, array_slice($tokens, 1)); |
| 234 | } |
| 235 | // Fallback — keep the raw delim as a one-char keyword. |
| 236 | if ($head instanceof DelimToken) { |
| 237 | return new Keyword($head->value); |
| 238 | } |
| 239 | return new Keyword(''); |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * @param list<Token> $tokens The function body, excluding the |
| 244 | * FunctionToken header and the closing RightParenToken. |
| 245 | */ |
| 246 | private function parseFunction(string $name, array $tokens): Value |
| 247 | { |
| 248 | $name = strtolower($name); |
| 249 | // Drop the trailing ) if present. |
| 250 | if ($tokens !== [] && end($tokens) instanceof RightParenToken) { |
| 251 | array_pop($tokens); |
| 252 | } |
| 253 | if ($name === 'url') { |
| 254 | // url("...") form. |
| 255 | foreach ($tokens as $tok) { |
| 256 | if ($tok instanceof StringToken) { |
| 257 | return new Url($tok->value); |
| 258 | } |
| 259 | } |
| 260 | return new Url(''); |
| 261 | } |
| 262 | // CSS Color 5 §4 — relative color syntax must run BEFORE |
| 263 | // the regular rgb / hsl / lab / etc. function parsers so |
| 264 | // they don't trip on the leading `from` keyword. |
| 265 | if (in_array($name, ['rgb', 'rgba', 'hsl', 'hsla', 'hwb', 'lab', 'lch', 'oklab', 'oklch', 'color'], true)) { |
| 266 | $relative = $this->parseRelativeColorIfPresent($name, $tokens); |
| 267 | if ($relative !== null) { |
| 268 | return $relative; |
| 269 | } |
| 270 | } |
| 271 | if ($name === 'rgb' || $name === 'rgba') { |
| 272 | return $this->parseRgbFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 273 | } |
| 274 | if ($name === 'hsl' || $name === 'hsla') { |
| 275 | return $this->parseHslFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 276 | } |
| 277 | if ($name === 'hwb') { |
| 278 | return $this->parseHwbFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 279 | } |
| 280 | if ($name === 'var') { |
| 281 | return $this->parseVarFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 282 | } |
| 283 | if ($name === 'color') { |
| 284 | return $this->parseColorFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 285 | } |
| 286 | if ($name === 'lab' || $name === 'lch' || $name === 'oklab' || $name === 'oklch') { |
| 287 | return $this->parseLabFunction($name, $tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 288 | } |
| 289 | if ($name === 'color-mix') { |
| 290 | return $this->parseColorMixFunction($tokens) ?? new CssFunction($name, $this->parseArgs($tokens)); |
| 291 | } |
| 292 | if (CalcFunction::tryFrom($name) !== null) { |
| 293 | $calc = $this->parseCalcFunction(CalcFunction::from($name), $tokens); |
| 294 | if ($calc !== null) { |
| 295 | return $calc; |
| 296 | } |
| 297 | } |
| 298 | if ($name === 'linear-gradient' || $name === 'repeating-linear-gradient') { |
| 299 | $g = $this->parseLinearGradient($tokens, $name === 'repeating-linear-gradient'); |
| 300 | if ($g !== null) { |
| 301 | return $g; |
| 302 | } |
| 303 | } |
| 304 | if ($name === 'radial-gradient' || $name === 'repeating-radial-gradient') { |
| 305 | $g = $this->parseRadialGradient($tokens, $name === 'repeating-radial-gradient'); |
| 306 | if ($g !== null) { |
| 307 | return $g; |
| 308 | } |
| 309 | } |
| 310 | if ($name === 'conic-gradient' || $name === 'repeating-conic-gradient') { |
| 311 | $g = $this->parseConicGradient($tokens, $name === 'repeating-conic-gradient'); |
| 312 | if ($g !== null) { |
| 313 | return $g; |
| 314 | } |
| 315 | } |
| 316 | if ($name === 'image-set' || $name === '-webkit-image-set') { |
| 317 | $set = $this->parseImageSet($tokens); |
| 318 | if ($set !== null) { |
| 319 | return $set; |
| 320 | } |
| 321 | } |
| 322 | if ($name === 'anchor') { |
| 323 | $a = $this->parseAnchorFunction($tokens); |
| 324 | if ($a !== null) { |
| 325 | return $a; |
| 326 | } |
| 327 | } |
| 328 | if ($name === 'anchor-size') { |
| 329 | $a = $this->parseAnchorSizeFunction($tokens); |
| 330 | if ($a !== null) { |
| 331 | return $a; |
| 332 | } |
| 333 | } |
| 334 | if ($name === 'attr') { |
| 335 | $a = $this->parseAttrFunction($tokens); |
| 336 | if ($a !== null) { |
| 337 | return $a; |
| 338 | } |
| 339 | } |
| 340 | if ($name === 'env') { |
| 341 | $e = $this->parseEnvFunction($tokens); |
| 342 | if ($e !== null) { |
| 343 | return $e; |
| 344 | } |
| 345 | } |
| 346 | if ($name === 'target-counter' || $name === 'target-counters' || $name === 'target-text') { |
| 347 | $t = $this->parseTargetFunction($name, $tokens); |
| 348 | if ($t !== null) { |
| 349 | return $t; |
| 350 | } |
| 351 | } |
| 352 | if ($name === 'string') { |
| 353 | $s = $this->parseStringFunction($tokens); |
| 354 | if ($s !== null) { |
| 355 | return $s; |
| 356 | } |
| 357 | } |
| 358 | if ($name === 'element') { |
| 359 | $e = $this->parseElementFunction($tokens); |
| 360 | if ($e !== null) { |
| 361 | return $e; |
| 362 | } |
| 363 | } |
| 364 | if ($name === 'paint') { |
| 365 | $p = $this->parsePaintFunction($tokens); |
| 366 | if ($p !== null) { |
| 367 | return $p; |
| 368 | } |
| 369 | } |
| 370 | if ($name === 'view') { |
| 371 | $v = $this->parseViewTimeline($tokens); |
| 372 | if ($v !== null) { |
| 373 | return $v; |
| 374 | } |
| 375 | } |
| 376 | if ($name === 'scroll') { |
| 377 | $s = $this->parseScrollTimeline($tokens); |
| 378 | if ($s !== null) { |
| 379 | return $s; |
| 380 | } |
| 381 | } |
| 382 | if ($name === 'light-dark') { |
| 383 | $ld = $this->parseLightDark($tokens); |
| 384 | if ($ld !== null) { |
| 385 | return $ld; |
| 386 | } |
| 387 | } |
| 388 | if ($name === 'contrast-color') { |
| 389 | $cc = $this->parseContrastColor($tokens); |
| 390 | if ($cc !== null) { |
| 391 | return $cc; |
| 392 | } |
| 393 | } |
| 394 | if ($name === 'cross-fade') { |
| 395 | $cf = $this->parseCrossFade($tokens); |
| 396 | if ($cf !== null) { |
| 397 | return $cf; |
| 398 | } |
| 399 | } |
| 400 | if ($name === 'device-cmyk') { |
| 401 | $dc = $this->parseDeviceCmyk($tokens); |
| 402 | if ($dc !== null) { |
| 403 | return $dc; |
| 404 | } |
| 405 | } |
| 406 | if ($name === 'linear') { |
| 407 | $le = $this->parseLinearEasingFunction($tokens); |
| 408 | if ($le !== null) { |
| 409 | return $le; |
| 410 | } |
| 411 | } |
| 412 | if ($name === 'cubic-bezier') { |
| 413 | $cb = $this->parseCubicBezierFunction($tokens); |
| 414 | if ($cb !== null) { |
| 415 | return $cb; |
| 416 | } |
| 417 | } |
| 418 | if ($name === 'steps') { |
| 419 | $st = $this->parseStepsFunction($tokens); |
| 420 | if ($st !== null) { |
| 421 | return $st; |
| 422 | } |
| 423 | } |
| 424 | if (in_array($name, ['circle', 'ellipse', 'inset', 'polygon', 'rect', 'xywh', 'path'], true)) { |
| 425 | $shape = $this->parseBasicShape($name, $tokens); |
| 426 | if ($shape !== null) { |
| 427 | return $shape; |
| 428 | } |
| 429 | } |
| 430 | // Generic fallback: each comma-separated group becomes one argument. |
| 431 | return new CssFunction($name, $this->parseArgs($tokens)); |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * Parse a sequence of transform functions into a single Transform value. |
| 436 | * Call from the cascade when the property being computed is `transform`. |
| 437 | */ |
| 438 | public function parseTransform(string $css): Value |
| 439 | { |
| 440 | return $this->postProcessTransform($this->parseFromString($css)); |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * Convert an already-parsed generic value (`CssFunction` or |
| 445 | * `ValueList` of `CssFunction`s) into a typed `Transform` value. |
| 446 | * Falls back to the original value when a function isn't a |
| 447 | * recognised transform — preserves `none` and any future |
| 448 | * additions that aren't yet handled. |
| 449 | */ |
| 450 | public function postProcessTransform(Value $value): Value |
| 451 | { |
| 452 | if ($value instanceof Transform) { |
| 453 | return $value; |
| 454 | } |
| 455 | $items = $value instanceof ValueList ? $value->values : [$value]; |
| 456 | $fns = []; |
| 457 | foreach ($items as $v) { |
| 458 | $fn = $this->valueToTransformFunction($v); |
| 459 | if ($fn === null) { |
| 460 | return $value; |
| 461 | } |
| 462 | $fns[] = $fn; |
| 463 | } |
| 464 | return new Transform($fns); |
| 465 | } |
| 466 | |
| 467 | /** |
| 468 | * Parse + type a `filter:` declaration. Convenience entry |
| 469 | * point for tests + the cascade post-processor. |
| 470 | */ |
| 471 | public function parseFilter(string $css): Value |
| 472 | { |
| 473 | return $this->postProcessFilter($this->parseFromString($css)); |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * Convert a generic parsed value (CssFunction, ValueList of |
| 478 | * CssFunctions, Url) into a typed `Filter` so the painter can |
| 479 | * dispatch by FilterKind without re-inspecting strings. The |
| 480 | * keyword `none` (initial value) and any unrecognised |
| 481 | * function fall through unchanged. |
| 482 | */ |
| 483 | public function postProcessFilter(Value $value): Value |
| 484 | { |
| 485 | if ($value instanceof Filter) { |
| 486 | return $value; |
| 487 | } |
| 488 | if ($value instanceof Keyword && strtolower($value->name) === 'none') { |
| 489 | return $value; |
| 490 | } |
| 491 | $items = $value instanceof ValueList ? $value->values : [$value]; |
| 492 | $fns = []; |
| 493 | foreach ($items as $v) { |
| 494 | $fn = $this->valueToFilterFunction($v); |
| 495 | if ($fn === null) { |
| 496 | return $value; |
| 497 | } |
| 498 | $fns[] = $fn; |
| 499 | } |
| 500 | if ($fns === []) { |
| 501 | return $value; |
| 502 | } |
| 503 | return new Filter($fns); |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * CSS Fonts 4 §6.4 — lift `font-feature-settings`'s |
| 508 | * comma-separated `<feature-tag-value>` list into a typed |
| 509 | * {@see FontFeatureSettings}. Each entry is a 4-character |
| 510 | * OpenType tag (a StringValue) optionally followed by an |
| 511 | * integer / `on` / `off`. |
| 512 | * |
| 513 | * font-feature-settings: "tnum", "liga" off, "ss01" 1; |
| 514 | * |
| 515 | * `normal` passes through unchanged; malformed entries cause |
| 516 | * the whole declaration to fall back to its original value so |
| 517 | * authors don't lose the surrounding context. |
| 518 | */ |
| 519 | public function postProcessFontFeatureSettings(Value $value): Value |
| 520 | { |
| 521 | if ($value instanceof FontFeatureSettings) { |
| 522 | return $value; |
| 523 | } |
| 524 | if ($value instanceof Keyword && strtolower($value->name) === 'normal') { |
| 525 | return $value; |
| 526 | } |
| 527 | $entries = []; |
| 528 | if ($value instanceof ValueList && $value->separator === ListSeparator::Comma) { |
| 529 | $candidates = $value->values; |
| 530 | } else { |
| 531 | $candidates = [$value]; |
| 532 | } |
| 533 | foreach ($candidates as $entry) { |
| 534 | $parsed = $this->parseFontFeatureEntry($entry); |
| 535 | if ($parsed === null) { |
| 536 | return $value; |
| 537 | } |
| 538 | $entries[] = $parsed; |
| 539 | } |
| 540 | if ($entries === []) { |
| 541 | return $value; |
| 542 | } |
| 543 | return new FontFeatureSettings($entries); |
| 544 | } |
| 545 | |
| 546 | /** |
| 547 | * CSS Fonts 4 §6.5 — counterpart to font-feature-settings for |
| 548 | * the variable-font axes. Lifts `<string> <number>` pairs into |
| 549 | * {@see FontVariationSettings} entries. |
| 550 | * |
| 551 | * font-variation-settings: "wght" 600, "wdth" 95.5; |
| 552 | */ |
| 553 | public function postProcessFontVariationSettings(Value $value): Value |
| 554 | { |
| 555 | if ($value instanceof FontVariationSettings) { |
| 556 | return $value; |
| 557 | } |
| 558 | if ($value instanceof Keyword && strtolower($value->name) === 'normal') { |
| 559 | return $value; |
| 560 | } |
| 561 | $entries = []; |
| 562 | $candidates = $value instanceof ValueList && $value->separator === ListSeparator::Comma |
| 563 | ? $value->values |
| 564 | : [$value]; |
| 565 | foreach ($candidates as $entry) { |
| 566 | $parsed = $this->parseFontVariationEntry($entry); |
| 567 | if ($parsed === null) { |
| 568 | return $value; |
| 569 | } |
| 570 | $entries[] = $parsed; |
| 571 | } |
| 572 | if ($entries === []) { |
| 573 | return $value; |
| 574 | } |
| 575 | return new FontVariationSettings($entries); |
| 576 | } |
| 577 | |
| 578 | private function parseFontVariationEntry(Value $value): ?FontVariationValue |
| 579 | { |
| 580 | if (!($value instanceof ValueList) || $value->separator !== ListSeparator::Space) { |
| 581 | return null; |
| 582 | } |
| 583 | $parts = $value->values; |
| 584 | if (count($parts) !== 2 || !($parts[0] instanceof StringValue)) { |
| 585 | return null; |
| 586 | } |
| 587 | $tag = $parts[0]->value; |
| 588 | $val = $parts[1]; |
| 589 | if ($val instanceof Integer) { |
| 590 | return new FontVariationValue($tag, (float) $val->value); |
| 591 | } |
| 592 | if ($val instanceof Number) { |
| 593 | return new FontVariationValue($tag, (float) $val->value); |
| 594 | } |
| 595 | return null; |
| 596 | } |
| 597 | |
| 598 | private function parseFontFeatureEntry(Value $value): ?FontFeatureValue |
| 599 | { |
| 600 | if ($value instanceof StringValue) { |
| 601 | return new FontFeatureValue($value->value, 1); |
| 602 | } |
| 603 | if (!($value instanceof ValueList) || $value->separator !== ListSeparator::Space) { |
| 604 | return null; |
| 605 | } |
| 606 | $parts = $value->values; |
| 607 | if (count($parts) < 1 || count($parts) > 2) { |
| 608 | return null; |
| 609 | } |
| 610 | if (!($parts[0] instanceof StringValue)) { |
| 611 | return null; |
| 612 | } |
| 613 | $tag = $parts[0]->value; |
| 614 | if (!isset($parts[1])) { |
| 615 | return new FontFeatureValue($tag, 1); |
| 616 | } |
| 617 | $val = $parts[1]; |
| 618 | if ($val instanceof Keyword) { |
| 619 | $kw = strtolower($val->name); |
| 620 | if ($kw === 'on') { |
| 621 | return new FontFeatureValue($tag, 1); |
| 622 | } |
| 623 | if ($kw === 'off') { |
| 624 | return new FontFeatureValue($tag, 0); |
| 625 | } |
| 626 | return null; |
| 627 | } |
| 628 | if ($val instanceof Integer) { |
| 629 | return new FontFeatureValue($tag, $val->value); |
| 630 | } |
| 631 | if ($val instanceof Number && (int) $val->value == $val->value) { |
| 632 | return new FontFeatureValue($tag, (int) $val->value); |
| 633 | } |
| 634 | return null; |
| 635 | } |
| 636 | |
| 637 | private function valueToFilterFunction(Value $value): ?FilterFunction |
| 638 | { |
| 639 | // url() references for SVG filter chains are valid filter |
| 640 | // values too. |
| 641 | if ($value instanceof Url) { |
| 642 | return new FilterFunction(FilterKind::Url, [$value]); |
| 643 | } |
| 644 | if (!($value instanceof CssFunction)) { |
| 645 | return null; |
| 646 | } |
| 647 | $kind = FilterKind::tryFrom(strtolower($value->name)); |
| 648 | if ($kind === null) { |
| 649 | return null; |
| 650 | } |
| 651 | return new FilterFunction($kind, $value->arguments); |
| 652 | } |
| 653 | |
| 654 | private function valueToTransformFunction(Value $value): ?TransformFunction |
| 655 | { |
| 656 | if (!$value instanceof CssFunction) { |
| 657 | return null; |
| 658 | } |
| 659 | $name = strtolower($value->name); |
| 660 | $args = $value->arguments; |
| 661 | return match ($name) { |
| 662 | 'translate' => $this->buildTranslate($args, false), |
| 663 | 'translatex' => count($args) === 1 ? new TranslateTransform($this->toLengthOrPct($args[0]), new Length(0, LengthUnit::Px)) : null, |
| 664 | 'translatey' => count($args) === 1 ? new TranslateTransform(new Length(0, LengthUnit::Px), $this->toLengthOrPct($args[0])) : null, |
| 665 | 'translatez' => count($args) === 1 && $args[0] instanceof Length ? new TranslateTransform(new Length(0, LengthUnit::Px), new Length(0, LengthUnit::Px), $args[0]) : null, |
| 666 | 'translate3d' => $this->buildTranslate($args, true), |
| 667 | 'rotate' => count($args) === 1 ? new RotateTransform($this->toAngleDeg($args[0])) : null, |
| 668 | 'rotatex' => count($args) === 1 ? new RotateTransform($this->toAngleDeg($args[0]), 1.0, 0.0, 0.0) : null, |
| 669 | 'rotatey' => count($args) === 1 ? new RotateTransform($this->toAngleDeg($args[0]), 0.0, 1.0, 0.0) : null, |
| 670 | 'rotatez' => count($args) === 1 ? new RotateTransform($this->toAngleDeg($args[0]), 0.0, 0.0, 1.0) : null, |
| 671 | 'rotate3d' => $this->buildRotate3d($args), |
| 672 | 'scale' => $this->buildScale($args), |
| 673 | 'scalex' => count($args) === 1 ? new ScaleTransform($this->toFloat($args[0]), 1.0) : null, |
| 674 | 'scaley' => count($args) === 1 ? new ScaleTransform(1.0, $this->toFloat($args[0])) : null, |
| 675 | 'scalez' => count($args) === 1 ? new ScaleTransform(1.0, 1.0, $this->toFloat($args[0])) : null, |
| 676 | 'scale3d' => count($args) === 3 ? new ScaleTransform($this->toFloat($args[0]), $this->toFloat($args[1]), $this->toFloat($args[2])) : null, |
| 677 | 'skew' => $this->buildSkew($args), |
| 678 | 'skewx' => count($args) === 1 ? new SkewTransform($this->toAngleDeg($args[0])) : null, |
| 679 | 'skewy' => count($args) === 1 ? new SkewTransform(0.0, $this->toAngleDeg($args[0])) : null, |
| 680 | 'matrix' => count($args) === 6 ? new MatrixTransform( |
| 681 | $this->toFloat($args[0]), |
| 682 | $this->toFloat($args[1]), |
| 683 | $this->toFloat($args[2]), |
| 684 | $this->toFloat($args[3]), |
| 685 | $this->toFloat($args[4]), |
| 686 | $this->toFloat($args[5]), |
| 687 | ) : null, |
| 688 | // CSS Transforms 2 §6.6 — `matrix3d(a1..a16)` in column- |
| 689 | // major order. Print is 2D, so we extract the affine |
| 690 | // (a, b, c, d, e, f) entries by projecting the 4×4 onto |
| 691 | // the X / Y plane: the 2D matrix `matrix(m11, m12, m21, |
| 692 | // m22, m41, m42)` corresponds to input indices 0, 1, 4, |
| 693 | // 5, 12, 13. The 3D rotation / perspective components |
| 694 | // collapse out, which is the same flattening other 3D |
| 695 | // transforms get. |
| 696 | 'matrix3d' => count($args) === 16 ? new MatrixTransform( |
| 697 | $this->toFloat($args[0]), |
| 698 | $this->toFloat($args[1]), |
| 699 | $this->toFloat($args[4]), |
| 700 | $this->toFloat($args[5]), |
| 701 | $this->toFloat($args[12]), |
| 702 | $this->toFloat($args[13]), |
| 703 | ) : null, |
| 704 | // `perspective(<length>)` accepts the syntax but the |
| 705 | // print medium has no depth, so the function flattens |
| 706 | // to identity. Authors typically combine `perspective` |
| 707 | // with `rotateX` / `rotateY`; in print only the |
| 708 | // rotation portion contributes visually (via the |
| 709 | // cos-flatten in the painter). |
| 710 | 'perspective' => new MatrixTransform(1.0, 0.0, 0.0, 1.0, 0.0, 0.0), |
| 711 | default => null, |
| 712 | }; |
| 713 | } |
| 714 | |
| 715 | /** @param list<Value> $args */ |
| 716 | private function buildTranslate(array $args, bool $is3d): ?TransformFunction |
| 717 | { |
| 718 | if ($is3d) { |
| 719 | if (count($args) !== 3) { |
| 720 | return null; |
| 721 | } |
| 722 | $z = $args[2] instanceof Length ? $args[2] : null; |
| 723 | if ($z === null) { |
| 724 | return null; |
| 725 | } |
| 726 | return new TranslateTransform($this->toLengthOrPct($args[0]), $this->toLengthOrPct($args[1]), $z); |
| 727 | } |
| 728 | if (count($args) === 1) { |
| 729 | return new TranslateTransform($this->toLengthOrPct($args[0]), new Length(0, LengthUnit::Px)); |
| 730 | } |
| 731 | if (count($args) === 2) { |
| 732 | return new TranslateTransform($this->toLengthOrPct($args[0]), $this->toLengthOrPct($args[1])); |
| 733 | } |
| 734 | return null; |
| 735 | } |
| 736 | |
| 737 | /** @param list<Value> $args */ |
| 738 | private function buildRotate3d(array $args): ?RotateTransform |
| 739 | { |
| 740 | if (count($args) !== 4) { |
| 741 | return null; |
| 742 | } |
| 743 | return new RotateTransform( |
| 744 | $this->toAngleDeg($args[3]), |
| 745 | $this->toFloat($args[0]), |
| 746 | $this->toFloat($args[1]), |
| 747 | $this->toFloat($args[2]), |
| 748 | ); |
| 749 | } |
| 750 | |
| 751 | /** @param list<Value> $args */ |
| 752 | private function buildScale(array $args): ?ScaleTransform |
| 753 | { |
| 754 | if (count($args) === 1) { |
| 755 | $sx = $this->toFloat($args[0]); |
| 756 | return new ScaleTransform($sx, $sx); |
| 757 | } |
| 758 | if (count($args) === 2) { |
| 759 | return new ScaleTransform($this->toFloat($args[0]), $this->toFloat($args[1])); |
| 760 | } |
| 761 | return null; |
| 762 | } |
| 763 | |
| 764 | /** @param list<Value> $args */ |
| 765 | private function buildSkew(array $args): ?SkewTransform |
| 766 | { |
| 767 | if (count($args) === 1) { |
| 768 | return new SkewTransform($this->toAngleDeg($args[0])); |
| 769 | } |
| 770 | if (count($args) === 2) { |
| 771 | return new SkewTransform($this->toAngleDeg($args[0]), $this->toAngleDeg($args[1])); |
| 772 | } |
| 773 | return null; |
| 774 | } |
| 775 | |
| 776 | private function toLengthOrPct(Value $v): Length|Percentage |
| 777 | { |
| 778 | if ($v instanceof Length) { |
| 779 | return $v; |
| 780 | } |
| 781 | if ($v instanceof Percentage) { |
| 782 | return $v; |
| 783 | } |
| 784 | if ($v instanceof Number || $v instanceof Integer) { |
| 785 | // Per spec: in some contexts unitless numbers are treated as pixels. |
| 786 | return new Length((float) ($v instanceof Number ? $v->value : $v->value), LengthUnit::Px); |
| 787 | } |
| 788 | return new Length(0, LengthUnit::Px); |
| 789 | } |
| 790 | |
| 791 | private function toAngleDeg(Value $v): float |
| 792 | { |
| 793 | if ($v instanceof Angle) { |
| 794 | return $v->toDegrees(); |
| 795 | } |
| 796 | if ($v instanceof Number || $v instanceof Integer) { |
| 797 | // Unitless 0 is the only valid angle without a unit per spec; |
| 798 | // other unitless values are technically a parse error, but we |
| 799 | // accept them by treating as degrees. |
| 800 | return (float) ($v instanceof Number ? $v->value : $v->value); |
| 801 | } |
| 802 | return 0.0; |
| 803 | } |
| 804 | |
| 805 | private function toFloat(Value $v): float |
| 806 | { |
| 807 | if ($v instanceof Number || $v instanceof Integer) { |
| 808 | return (float) ($v instanceof Number ? $v->value : $v->value); |
| 809 | } |
| 810 | return 0.0; |
| 811 | } |
| 812 | |
| 813 | /** @param list<Token> $tokens |
| 814 | * @return list<Value> |
| 815 | */ |
| 816 | private function parseArgs(array $tokens): array |
| 817 | { |
| 818 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 819 | return array_map(fn($g): Value => $this->parseSpaceList($g), $groups); |
| 820 | } |
| 821 | |
| 822 | /** @param list<Token> $tokens */ |
| 823 | private function parseRgbFunction(array $tokens): ?Color |
| 824 | { |
| 825 | // Accept both legacy comma form `rgb(r, g, b[, a])` and modern |
| 826 | // space form `rgb(r g b [/ a])`. Components are number 0-255 or |
| 827 | // percentage 0-100; alpha is number 0-1 or percentage. |
| 828 | $tokens = self::trimWhitespace($tokens); |
| 829 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 830 | if (count($commaGroups) >= 3) { |
| 831 | $groups = $commaGroups; |
| 832 | } else { |
| 833 | // Space-separated; the slash separates alpha. |
| 834 | $groups = self::splitRgbSpaceForm($tokens); |
| 835 | } |
| 836 | $count = count($groups); |
| 837 | if ($count < 3 || $count > 4) { |
| 838 | return null; |
| 839 | } |
| 840 | $rgb = []; |
| 841 | for ($i = 0; $i < 3; $i++) { |
| 842 | $v = $this->extractRgbComponent($groups[$i]); |
| 843 | if ($v === null) { |
| 844 | return null; |
| 845 | } |
| 846 | $rgb[] = $v; |
| 847 | } |
| 848 | $a = 1.0; |
| 849 | if ($count === 4) { |
| 850 | $alphaTok = $this->extractAlphaComponent($groups[3]); |
| 851 | if ($alphaTok === null) { |
| 852 | return null; |
| 853 | } |
| 854 | $a = $alphaTok; |
| 855 | } |
| 856 | return new Color($rgb[0], $rgb[1], $rgb[2], $a); |
| 857 | } |
| 858 | |
| 859 | /** @param list<Token> $group */ |
| 860 | private function extractRgbComponent(array $group): ?float |
| 861 | { |
| 862 | $group = self::trimWhitespace($group); |
| 863 | if (count($group) !== 1) { |
| 864 | return null; |
| 865 | } |
| 866 | $t = $group[0]; |
| 867 | if ($t instanceof NumberToken) { |
| 868 | return max(0.0, min(1.0, $t->value / 255.0)); |
| 869 | } |
| 870 | if ($t instanceof PercentageToken) { |
| 871 | return max(0.0, min(1.0, $t->value / 100.0)); |
| 872 | } |
| 873 | return null; |
| 874 | } |
| 875 | |
| 876 | /** @param list<Token> $group */ |
| 877 | private function extractAlphaComponent(array $group): ?float |
| 878 | { |
| 879 | $group = self::trimWhitespace($group); |
| 880 | if (count($group) !== 1) { |
| 881 | return null; |
| 882 | } |
| 883 | $t = $group[0]; |
| 884 | if ($t instanceof NumberToken) { |
| 885 | return max(0.0, min(1.0, $t->value)); |
| 886 | } |
| 887 | if ($t instanceof PercentageToken) { |
| 888 | return max(0.0, min(1.0, $t->value / 100.0)); |
| 889 | } |
| 890 | return null; |
| 891 | } |
| 892 | |
| 893 | /** |
| 894 | * Split tokens by top-level whitespace, with `/` recognised as the |
| 895 | * alpha separator that yields a 4th group. |
| 896 | * |
| 897 | * @param list<Token> $tokens |
| 898 | * @return list<list<Token>> |
| 899 | */ |
| 900 | private static function splitRgbSpaceForm(array $tokens): array |
| 901 | { |
| 902 | $groups = []; |
| 903 | $current = []; |
| 904 | foreach ($tokens as $t) { |
| 905 | if ($t instanceof WhitespaceToken) { |
| 906 | if ($current !== []) { |
| 907 | $groups[] = $current; |
| 908 | $current = []; |
| 909 | } |
| 910 | continue; |
| 911 | } |
| 912 | if ($t instanceof DelimToken && $t->value === '/') { |
| 913 | if ($current !== []) { |
| 914 | $groups[] = $current; |
| 915 | $current = []; |
| 916 | } |
| 917 | continue; |
| 918 | } |
| 919 | $current[] = $t; |
| 920 | } |
| 921 | if ($current !== []) { |
| 922 | $groups[] = $current; |
| 923 | } |
| 924 | return $groups; |
| 925 | } |
| 926 | |
| 927 | /** |
| 928 | * Top-level split on a `/` delim token only — components are |
| 929 | * left intact (including their inner whitespace). Used for |
| 930 | * grammar fragments like `device-cmyk(<c> <m> <y> <k> / <a>)` |
| 931 | * where the slash separates a multi-token primary list from |
| 932 | * the alpha tail. |
| 933 | * |
| 934 | * @param list<Token> $tokens |
| 935 | * @return list<list<Token>> |
| 936 | */ |
| 937 | private static function splitOnSlash(array $tokens): array |
| 938 | { |
| 939 | $groups = []; |
| 940 | $current = []; |
| 941 | $depth = 0; |
| 942 | foreach ($tokens as $t) { |
| 943 | if ($t instanceof FunctionToken || $t instanceof LeftParenToken) { |
| 944 | $depth++; |
| 945 | $current[] = $t; |
| 946 | continue; |
| 947 | } |
| 948 | if ($t instanceof RightParenToken) { |
| 949 | $depth--; |
| 950 | $current[] = $t; |
| 951 | continue; |
| 952 | } |
| 953 | if ($depth === 0 && $t instanceof DelimToken && $t->value === '/') { |
| 954 | $groups[] = $current; |
| 955 | $current = []; |
| 956 | continue; |
| 957 | } |
| 958 | $current[] = $t; |
| 959 | } |
| 960 | $groups[] = $current; |
| 961 | return $groups; |
| 962 | } |
| 963 | |
| 964 | /** @param list<Token> $tokens */ |
| 965 | private function parseHslFunction(array $tokens): ?Color |
| 966 | { |
| 967 | $tokens = self::trimWhitespace($tokens); |
| 968 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 969 | $groups = count($commaGroups) >= 3 ? $commaGroups : self::splitRgbSpaceForm($tokens); |
| 970 | $count = count($groups); |
| 971 | if ($count < 3 || $count > 4) { |
| 972 | return null; |
| 973 | } |
| 974 | $h = $this->extractHueComponent($groups[0]); |
| 975 | $s = $this->extractPercentageComponent($groups[1]); |
| 976 | $l = $this->extractPercentageComponent($groups[2]); |
| 977 | if ($h === null || $s === null || $l === null) { |
| 978 | return null; |
| 979 | } |
| 980 | $a = $count === 4 ? $this->extractAlphaComponent($groups[3]) : 1.0; |
| 981 | if ($a === null) { |
| 982 | return null; |
| 983 | } |
| 984 | [$r, $g, $b] = self::hslToRgb($h, $s, $l); |
| 985 | return new Color($r, $g, $b, $a); |
| 986 | } |
| 987 | |
| 988 | /** |
| 989 | * CSS Color 4 §6 — `hwb(<hue> <whiteness>% <blackness>% [/ <alpha>])`. |
| 990 | * Whiteness/blackness sum >= 1 collapses to a grey; otherwise we mix |
| 991 | * the pure-saturation hue with white and black per the spec formula |
| 992 | * and store the result as sRGB. |
| 993 | * |
| 994 | * @param list<Token> $tokens |
| 995 | */ |
| 996 | private function parseHwbFunction(array $tokens): ?Color |
| 997 | { |
| 998 | $tokens = self::trimWhitespace($tokens); |
| 999 | $groups = self::splitRgbSpaceForm($tokens); |
| 1000 | $count = count($groups); |
| 1001 | if ($count < 3 || $count > 4) { |
| 1002 | return null; |
| 1003 | } |
| 1004 | $h = $this->extractHueComponent($groups[0]); |
| 1005 | $w = $this->extractPercentageComponent($groups[1]); |
| 1006 | $b = $this->extractPercentageComponent($groups[2]); |
| 1007 | if ($h === null || $w === null || $b === null) { |
| 1008 | return null; |
| 1009 | } |
| 1010 | $a = $count === 4 ? $this->extractAlphaComponent($groups[3]) : 1.0; |
| 1011 | if ($a === null) { |
| 1012 | return null; |
| 1013 | } |
| 1014 | // extractHueComponent returns the hue normalised to [0, 1). Scale |
| 1015 | // back to degrees so the converter can do its standard hue→rgb. |
| 1016 | $hDeg = $h * 360.0; |
| 1017 | if ($w + $b >= 1.0) { |
| 1018 | $gray = $w / ($w + $b); |
| 1019 | return new Color($gray, $gray, $gray, $a); |
| 1020 | } |
| 1021 | [$rh, $gh, $bh] = self::hslToRgb($h, 1.0, 0.5); |
| 1022 | $r = $rh * (1.0 - $w - $b) + $w; |
| 1023 | $g = $gh * (1.0 - $w - $b) + $w; |
| 1024 | $b2 = $bh * (1.0 - $w - $b) + $w; |
| 1025 | return new Color( |
| 1026 | max(0.0, min(1.0, $r)), |
| 1027 | max(0.0, min(1.0, $g)), |
| 1028 | max(0.0, min(1.0, $b2)), |
| 1029 | $a, |
| 1030 | ); |
| 1031 | } |
| 1032 | |
| 1033 | /** @param list<Token> $group */ |
| 1034 | private function extractHueComponent(array $group): ?float |
| 1035 | { |
| 1036 | $group = self::trimWhitespace($group); |
| 1037 | if (count($group) !== 1) { |
| 1038 | return null; |
| 1039 | } |
| 1040 | $t = $group[0]; |
| 1041 | if ($t instanceof IdentToken && strtolower($t->value) === 'none') { |
| 1042 | // CSS Color 4 §10.5 — `none` in a literal context resolves |
| 1043 | // to 0. The "missing-component" tag is only meaningful in |
| 1044 | // interpolation, which we don't model here. |
| 1045 | return 0.0; |
| 1046 | } |
| 1047 | if ($t instanceof NumberToken) { |
| 1048 | return fmod(fmod($t->value, 360) + 360, 360) / 360.0; // normalise to [0, 1) |
| 1049 | } |
| 1050 | if ($t instanceof DimensionToken) { |
| 1051 | $degrees = match (strtolower($t->unit)) { |
| 1052 | 'deg' => $t->value, |
| 1053 | 'rad' => $t->value * 180 / M_PI, |
| 1054 | 'grad' => $t->value * 0.9, |
| 1055 | 'turn' => $t->value * 360, |
| 1056 | default => null, |
| 1057 | }; |
| 1058 | if ($degrees === null) { |
| 1059 | return null; |
| 1060 | } |
| 1061 | return fmod(fmod($degrees, 360) + 360, 360) / 360.0; |
| 1062 | } |
| 1063 | return null; |
| 1064 | } |
| 1065 | |
| 1066 | /** @param list<Token> $group */ |
| 1067 | private function extractPercentageComponent(array $group): ?float |
| 1068 | { |
| 1069 | $group = self::trimWhitespace($group); |
| 1070 | if (count($group) !== 1) { |
| 1071 | return null; |
| 1072 | } |
| 1073 | $t = $group[0]; |
| 1074 | if ($t instanceof IdentToken && strtolower($t->value) === 'none') { |
| 1075 | // CSS Color 4 §10.5 — `none` resolves to 0 outside |
| 1076 | // interpolation contexts. |
| 1077 | return 0.0; |
| 1078 | } |
| 1079 | if ($t instanceof PercentageToken) { |
| 1080 | return max(0.0, min(1.0, $t->value / 100.0)); |
| 1081 | } |
| 1082 | return null; |
| 1083 | } |
| 1084 | |
| 1085 | /** |
| 1086 | * Convert HSL (each component in [0, 1]) to sRGB (each component in [0, 1]) |
| 1087 | * per CSS Color 4 algorithm. |
| 1088 | * |
| 1089 | * @return array{0:float,1:float,2:float} |
| 1090 | */ |
| 1091 | private static function hslToRgb(float $h, float $s, float $l): array |
| 1092 | { |
| 1093 | if ($s === 0.0) { |
| 1094 | return [$l, $l, $l]; |
| 1095 | } |
| 1096 | $q = $l < 0.5 ? $l * (1 + $s) : $l + $s - $l * $s; |
| 1097 | $p = 2 * $l - $q; |
| 1098 | $hueToRgb = static function (float $p, float $q, float $t): float { |
| 1099 | if ($t < 0) { |
| 1100 | $t += 1; |
| 1101 | } |
| 1102 | if ($t > 1) { |
| 1103 | $t -= 1; |
| 1104 | } |
| 1105 | if ($t < 1 / 6) { |
| 1106 | return $p + ($q - $p) * 6 * $t; |
| 1107 | } |
| 1108 | if ($t < 1 / 2) { |
| 1109 | return $q; |
| 1110 | } |
| 1111 | if ($t < 2 / 3) { |
| 1112 | return $p + ($q - $p) * (2 / 3 - $t) * 6; |
| 1113 | } |
| 1114 | return $p; |
| 1115 | }; |
| 1116 | return [ |
| 1117 | $hueToRgb($p, $q, $h + 1 / 3), |
| 1118 | $hueToRgb($p, $q, $h), |
| 1119 | $hueToRgb($p, $q, $h - 1 / 3), |
| 1120 | ]; |
| 1121 | } |
| 1122 | |
| 1123 | private function parseHexColor(string $hex): ?Color |
| 1124 | { |
| 1125 | $hex = strtolower($hex); |
| 1126 | // Accept 3, 4, 6, 8 hex digits. |
| 1127 | if (!preg_match('/^[0-9a-f]+$/', $hex)) { |
| 1128 | return null; |
| 1129 | } |
| 1130 | $len = strlen($hex); |
| 1131 | if ($len === 3) { |
| 1132 | $r = hexdec($hex[0] . $hex[0]); |
| 1133 | $g = hexdec($hex[1] . $hex[1]); |
| 1134 | $b = hexdec($hex[2] . $hex[2]); |
| 1135 | return new Color($r / 255.0, $g / 255.0, $b / 255.0); |
| 1136 | } |
| 1137 | if ($len === 4) { |
| 1138 | $r = hexdec($hex[0] . $hex[0]); |
| 1139 | $g = hexdec($hex[1] . $hex[1]); |
| 1140 | $b = hexdec($hex[2] . $hex[2]); |
| 1141 | $a = hexdec($hex[3] . $hex[3]); |
| 1142 | return new Color($r / 255.0, $g / 255.0, $b / 255.0, $a / 255.0); |
| 1143 | } |
| 1144 | if ($len === 6) { |
| 1145 | $r = hexdec(substr($hex, 0, 2)); |
| 1146 | $g = hexdec(substr($hex, 2, 2)); |
| 1147 | $b = hexdec(substr($hex, 4, 2)); |
| 1148 | return new Color($r / 255.0, $g / 255.0, $b / 255.0); |
| 1149 | } |
| 1150 | if ($len === 8) { |
| 1151 | $r = hexdec(substr($hex, 0, 2)); |
| 1152 | $g = hexdec(substr($hex, 2, 2)); |
| 1153 | $b = hexdec(substr($hex, 4, 2)); |
| 1154 | $a = hexdec(substr($hex, 6, 2)); |
| 1155 | return new Color($r / 255.0, $g / 255.0, $b / 255.0, $a / 255.0); |
| 1156 | } |
| 1157 | return null; |
| 1158 | } |
| 1159 | |
| 1160 | // ============================================================ |
| 1161 | // var(--name, fallback) |
| 1162 | // ============================================================ |
| 1163 | /** @param list<Token> $tokens */ |
| 1164 | private function parseVarFunction(array $tokens): ?CustomProperty |
| 1165 | { |
| 1166 | $tokens = self::trimWhitespace($tokens); |
| 1167 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 1168 | if (count($groups) < 1 || count($groups) > 2) { |
| 1169 | return null; |
| 1170 | } |
| 1171 | $nameTokens = self::trimWhitespace($groups[0]); |
| 1172 | if (count($nameTokens) !== 1 || !($nameTokens[0] instanceof IdentToken)) { |
| 1173 | return null; |
| 1174 | } |
| 1175 | $name = $nameTokens[0]->value; |
| 1176 | if (!str_starts_with($name, '--')) { |
| 1177 | return null; |
| 1178 | } |
| 1179 | $fallback = null; |
| 1180 | if (count($groups) === 2) { |
| 1181 | $fallback = $this->parseSpaceList($groups[1]); |
| 1182 | } |
| 1183 | return new CustomProperty($name, $fallback); |
| 1184 | } |
| 1185 | |
| 1186 | // ============================================================ |
| 1187 | // color(<space> r g b [/ a]) |
| 1188 | // ============================================================ |
| 1189 | /** @param list<Token> $tokens */ |
| 1190 | private function parseColorFunction(array $tokens): ?Color |
| 1191 | { |
| 1192 | $tokens = self::trimWhitespace($tokens); |
| 1193 | $groups = self::splitRgbSpaceForm($tokens); |
| 1194 | // Expect: [space] [r] [g] [b] (4 groups), with optional [a] (5 groups). |
| 1195 | if (count($groups) < 4 || count($groups) > 5) { |
| 1196 | return null; |
| 1197 | } |
| 1198 | $spaceTokens = self::trimWhitespace($groups[0]); |
| 1199 | if (count($spaceTokens) !== 1 || !($spaceTokens[0] instanceof IdentToken)) { |
| 1200 | return null; |
| 1201 | } |
| 1202 | $space = match (strtolower($spaceTokens[0]->value)) { |
| 1203 | 'srgb' => ColorSpace::sRGB, |
| 1204 | 'srgb-linear' => ColorSpace::sRGBLinear, |
| 1205 | 'display-p3' => ColorSpace::DisplayP3, |
| 1206 | 'display-p3-linear' => ColorSpace::DisplayP3Linear, |
| 1207 | 'a98-rgb' => ColorSpace::A98RGB, |
| 1208 | 'a98-rgb-linear' => ColorSpace::A98RGBLinear, |
| 1209 | 'prophoto-rgb' => ColorSpace::ProPhotoRGB, |
| 1210 | 'prophoto-rgb-linear' => ColorSpace::ProPhotoRGBLinear, |
| 1211 | 'rec2020' => ColorSpace::Rec2020, |
| 1212 | 'rec2020-linear' => ColorSpace::Rec2020Linear, |
| 1213 | 'xyz', 'xyz-d65' => ColorSpace::XYZD65, |
| 1214 | 'xyz-d50' => ColorSpace::XYZD50, |
| 1215 | default => null, |
| 1216 | }; |
| 1217 | if ($space === null) { |
| 1218 | return null; |
| 1219 | } |
| 1220 | $isXyzSpace = $space === ColorSpace::XYZD50 || $space === ColorSpace::XYZD65; |
| 1221 | $components = []; |
| 1222 | for ($i = 1; $i <= 3; $i++) { |
| 1223 | $c = $this->extractColorComponent($groups[$i], $isXyzSpace); |
| 1224 | if ($c === null) { |
| 1225 | return null; |
| 1226 | } |
| 1227 | $components[] = $c; |
| 1228 | } |
| 1229 | $a = 1.0; |
| 1230 | if (count($groups) === 5) { |
| 1231 | $aValue = $this->extractAlphaComponent($groups[4]); |
| 1232 | if ($aValue === null) { |
| 1233 | return null; |
| 1234 | } |
| 1235 | $a = $aValue; |
| 1236 | } |
| 1237 | return new Color($components[0], $components[1], $components[2], $a, $space); |
| 1238 | } |
| 1239 | |
| 1240 | /** |
| 1241 | * Extract a `color()` component. For sRGB-ish spaces this is |
| 1242 | * 0-1; CSS Color 4 §6 also allows out-of-gamut values, so we |
| 1243 | * preserve numeric inputs as-is rather than clamping. For XYZ |
| 1244 | * spaces, percentages map to the sRGB white-point's Y = 100% |
| 1245 | * (which is XYZ 1) so the divide-by-100 is still right. |
| 1246 | * |
| 1247 | * `none` ident resolves to 0 — a Missing-typed component lands |
| 1248 | * once the 4E color engine ships. |
| 1249 | * |
| 1250 | * @param list<Token> $group |
| 1251 | */ |
| 1252 | private function extractColorComponent(array $group, bool $isXyzSpace = false): ?float |
| 1253 | { |
| 1254 | unset($isXyzSpace); |
| 1255 | $group = self::trimWhitespace($group); |
| 1256 | if (count($group) !== 1) { |
| 1257 | return null; |
| 1258 | } |
| 1259 | $t = $group[0]; |
| 1260 | if ($t instanceof IdentToken && strtolower($t->value) === 'none') { |
| 1261 | return 0.0; |
| 1262 | } |
| 1263 | if ($t instanceof NumberToken) { |
| 1264 | // CSS Color 4 §6 allows out-of-gamut values; preserve |
| 1265 | // the raw number and let the gamut-mapping algorithm |
| 1266 | // (4E) decide what to do with it. |
| 1267 | return (float) $t->value; |
| 1268 | } |
| 1269 | if ($t instanceof PercentageToken) { |
| 1270 | return (float) $t->value / 100.0; |
| 1271 | } |
| 1272 | return null; |
| 1273 | } |
| 1274 | |
| 1275 | // ============================================================ |
| 1276 | // lab() / lch() / oklab() / oklch() — CSS Color 4 §10 |
| 1277 | // ============================================================ |
| 1278 | /** |
| 1279 | * Parse a `lab()`, `lch()`, `oklab()`, or `oklch()` functional |
| 1280 | * notation. CSS Color 4 §10 syntax: |
| 1281 | * |
| 1282 | * lab(L a b [/ alpha]) |
| 1283 | * lch(L C H [/ alpha]) |
| 1284 | * oklab(L a b [/ alpha]) |
| 1285 | * oklch(L C H [/ alpha]) |
| 1286 | * |
| 1287 | * Component value ranges per CSS Color 4: |
| 1288 | * |
| 1289 | * lab L: 0-100 (or 0-100%); a, b: ±125 (±100% = ±125) |
| 1290 | * lch L: 0-100 (or 0-100%); C: 0-150 (0-100% = 0-150); H: angle |
| 1291 | * oklab L: 0-1 (or 0-100%); a, b: ±0.4 (±100% = ±0.4) |
| 1292 | * oklch L: 0-1 (or 0-100%); C: 0-0.4 (0-100% = 0-0.4); H: angle |
| 1293 | * |
| 1294 | * Resolved values are stored in the Color's r/g/b slots without |
| 1295 | * normalisation — the color space tag identifies which axes |
| 1296 | * they represent. Downstream consumers (the 4E color engine) |
| 1297 | * do the gamut-conversion math. |
| 1298 | * |
| 1299 | * @param list<Token> $tokens |
| 1300 | */ |
| 1301 | private function parseLabFunction(string $name, array $tokens): ?Color |
| 1302 | { |
| 1303 | $tokens = self::trimWhitespace($tokens); |
| 1304 | $groups = self::splitRgbSpaceForm($tokens); |
| 1305 | if (count($groups) < 3 || count($groups) > 4) { |
| 1306 | return null; |
| 1307 | } |
| 1308 | |
| 1309 | $isLightnessPct100 = ($name === 'lab' || $name === 'lch'); |
| 1310 | $L = $this->extractLabLightness($groups[0], $isLightnessPct100); |
| 1311 | if ($L === null) { |
| 1312 | return null; |
| 1313 | } |
| 1314 | // CSS Color 4 §10.5 — `lab` / `lch` lightness clamps to |
| 1315 | // [0, 100]; `oklab` / `oklch` lightness clamps to [0, 1]. |
| 1316 | // The negative range, and values past the 100 / 1 ceiling, |
| 1317 | // are valid syntax but render at the boundary (WPT |
| 1318 | // lab-l-over-100-*, oklab-l-over-1-*). |
| 1319 | $lMax = $isLightnessPct100 ? 100.0 : 1.0; |
| 1320 | $L = max(0.0, min($lMax, $L)); |
| 1321 | |
| 1322 | $space = match ($name) { |
| 1323 | 'lab' => ColorSpace::Lab, |
| 1324 | 'lch' => ColorSpace::Lch, |
| 1325 | 'oklab' => ColorSpace::OKLab, |
| 1326 | 'oklch' => ColorSpace::OKLCH, |
| 1327 | default => null, |
| 1328 | }; |
| 1329 | if ($space === null) { |
| 1330 | return null; |
| 1331 | } |
| 1332 | |
| 1333 | $isPolar = ($name === 'lch' || $name === 'oklch'); |
| 1334 | if ($isPolar) { |
| 1335 | // C (chroma) — 0-150 for lch, 0-0.4 for oklch. |
| 1336 | $chromaMax = $name === 'lch' ? 150.0 : 0.4; |
| 1337 | $c = $this->extractChromaComponent($groups[1], $chromaMax); |
| 1338 | if ($c === null) { |
| 1339 | return null; |
| 1340 | } |
| 1341 | $h = $this->extractLabHueComponent($groups[2]); |
| 1342 | if ($h === null) { |
| 1343 | return null; |
| 1344 | } |
| 1345 | $a = 1.0; |
| 1346 | if (count($groups) === 4) { |
| 1347 | $aValue = $this->extractAlphaComponent($groups[3]); |
| 1348 | if ($aValue === null) { |
| 1349 | return null; |
| 1350 | } |
| 1351 | $a = $aValue; |
| 1352 | } |
| 1353 | return new Color($L, $c, $h, $a, $space); |
| 1354 | } |
| 1355 | |
| 1356 | // lab / oklab — a and b in Cartesian coordinates. |
| 1357 | $axisMax = $name === 'lab' ? 125.0 : 0.4; |
| 1358 | $aAxis = $this->extractLabAxisComponent($groups[1], $axisMax); |
| 1359 | $bAxis = $this->extractLabAxisComponent($groups[2], $axisMax); |
| 1360 | if ($aAxis === null || $bAxis === null) { |
| 1361 | return null; |
| 1362 | } |
| 1363 | $alpha = 1.0; |
| 1364 | if (count($groups) === 4) { |
| 1365 | $aValue = $this->extractAlphaComponent($groups[3]); |
| 1366 | if ($aValue === null) { |
| 1367 | return null; |
| 1368 | } |
| 1369 | $alpha = $aValue; |
| 1370 | } |
| 1371 | return new Color($L, $aAxis, $bAxis, $alpha, $space); |
| 1372 | } |
| 1373 | |
| 1374 | /** |
| 1375 | * Extract a `lab()` / `lch()` / `oklab()` / `oklch()` lightness. |
| 1376 | * `$pctTo100` selects the percentage mapping: |
| 1377 | * true → 0-100% maps to 0-100 (lab / lch) |
| 1378 | * false → 0-100% maps to 0-1 (oklab / oklch) |
| 1379 | * |
| 1380 | * `none` is parsed as a missing component per CSS Color 4 §10.5; |
| 1381 | * we resolve it to 0 for now (a Missing-typed component lands |
| 1382 | * once the 4E color engine ships). |
| 1383 | * |
| 1384 | * @param list<Token> $group |
| 1385 | */ |
| 1386 | private function extractLabLightness(array $group, bool $pctTo100): ?float |
| 1387 | { |
| 1388 | $group = self::trimWhitespace($group); |
| 1389 | if (count($group) !== 1) { |
| 1390 | return null; |
| 1391 | } |
| 1392 | $t = $group[0]; |
| 1393 | if ($t instanceof IdentToken && strtolower($t->value) === 'none') { |
| 1394 | return 0.0; |
| 1395 | } |
| 1396 | if ($t instanceof NumberToken) { |
| 1397 | return (float) $t->value; |
| 1398 | } |
| 1399 | if ($t instanceof PercentageToken) { |
| 1400 | return $pctTo100 ? (float) $t->value : ((float) $t->value / 100.0); |
| 1401 | } |
| 1402 | return null; |
| 1403 | } |
| 1404 | |
| 1405 | /** |
| 1406 | * Extract a `lab()` / `oklab()` axis component (a or b). |
| 1407 | * Percentages map ±100% → ±$axisMax. Numbers pass through. |
| 1408 | * `none` resolves to 0. |
| 1409 | * |
| 1410 | * @param list<Token> $group |
| 1411 | */ |
| 1412 | private function extractLabAxisComponent(array $group, float $axisMax): ?float |
| 1413 | { |
| 1414 | $group = self::trimWhitespace($group); |
| 1415 | if (count($group) !== 1) { |
| 1416 | return null; |
| 1417 | } |
| 1418 | $t = $group[0]; |
| 1419 | if ($t instanceof IdentToken && strtolower($t->value) === 'none') { |
| 1420 | return 0.0; |
| 1421 | } |
| 1422 | if ($t instanceof NumberToken) { |
| 1423 | return (float) $t->value; |
| 1424 | } |
| 1425 | if ($t instanceof PercentageToken) { |
| 1426 | return ((float) $t->value / 100.0) * $axisMax; |
| 1427 | } |
| 1428 | return null; |
| 1429 | } |
| 1430 | |
| 1431 | /** |
| 1432 | * Extract an `lch()` / `oklch()` chroma component. |
| 1433 | * Percentages map 0-100% → 0-$chromaMax. Numbers pass through. |
| 1434 | * `none` resolves to 0. |
| 1435 | * |
| 1436 | * @param list<Token> $group |
| 1437 | */ |
| 1438 | private function extractChromaComponent(array $group, float $chromaMax): ?float |
| 1439 | { |
| 1440 | $group = self::trimWhitespace($group); |
| 1441 | if (count($group) !== 1) { |
| 1442 | return null; |
| 1443 | } |
| 1444 | $t = $group[0]; |
| 1445 | if ($t instanceof IdentToken && strtolower($t->value) === 'none') { |
| 1446 | return 0.0; |
| 1447 | } |
| 1448 | if ($t instanceof NumberToken) { |
| 1449 | return max(0.0, (float) $t->value); |
| 1450 | } |
| 1451 | if ($t instanceof PercentageToken) { |
| 1452 | return max(0.0, ((float) $t->value / 100.0) * $chromaMax); |
| 1453 | } |
| 1454 | return null; |
| 1455 | } |
| 1456 | |
| 1457 | /** |
| 1458 | * Extract an `lch()` / `oklch()` hue component in degrees |
| 1459 | * (CSS Color 4 stores hues as degrees, not the 0-1 normalised |
| 1460 | * form HSL uses). Accepts number (degrees implied), `deg`, |
| 1461 | * `rad`, `grad`, `turn` dimension units, or `none`. |
| 1462 | * |
| 1463 | * @param list<Token> $group |
| 1464 | */ |
| 1465 | private function extractLabHueComponent(array $group): ?float |
| 1466 | { |
| 1467 | $group = self::trimWhitespace($group); |
| 1468 | if (count($group) !== 1) { |
| 1469 | return null; |
| 1470 | } |
| 1471 | $t = $group[0]; |
| 1472 | if ($t instanceof IdentToken && strtolower($t->value) === 'none') { |
| 1473 | return 0.0; |
| 1474 | } |
| 1475 | if ($t instanceof NumberToken) { |
| 1476 | return self::normaliseHueDegrees((float) $t->value); |
| 1477 | } |
| 1478 | if ($t instanceof DimensionToken) { |
| 1479 | $degrees = match (strtolower($t->unit)) { |
| 1480 | 'deg' => (float) $t->value, |
| 1481 | 'rad' => (float) $t->value * 180 / M_PI, |
| 1482 | 'grad' => (float) $t->value * 0.9, |
| 1483 | 'turn' => (float) $t->value * 360, |
| 1484 | default => null, |
| 1485 | }; |
| 1486 | if ($degrees === null) { |
| 1487 | return null; |
| 1488 | } |
| 1489 | return self::normaliseHueDegrees($degrees); |
| 1490 | } |
| 1491 | return null; |
| 1492 | } |
| 1493 | |
| 1494 | /** |
| 1495 | * Wrap a hue angle into the canonical [0, 360) range. |
| 1496 | */ |
| 1497 | private static function normaliseHueDegrees(float $degrees): float |
| 1498 | { |
| 1499 | return fmod(fmod($degrees, 360.0) + 360.0, 360.0); |
| 1500 | } |
| 1501 | |
| 1502 | // ============================================================ |
| 1503 | // relative color syntax — CSS Color 5 §4 |
| 1504 | // ============================================================ |
| 1505 | /** |
| 1506 | * Detect a `<colorFn>(from <color> ...)` prefix and parse the |
| 1507 | * relative-color form. Returns null when the function doesn't |
| 1508 | * start with `from`, so the caller falls back to its non- |
| 1509 | * relative parser. |
| 1510 | * |
| 1511 | * @param list<Token> $tokens |
| 1512 | */ |
| 1513 | private function parseRelativeColorIfPresent(string $name, array $tokens): ?RelativeColor |
| 1514 | { |
| 1515 | $trimmed = self::trimWhitespace($tokens); |
| 1516 | if ($trimmed === []) { |
| 1517 | return null; |
| 1518 | } |
| 1519 | $first = $trimmed[0]; |
| 1520 | if (!($first instanceof IdentToken) || strtolower($first->value) !== 'from') { |
| 1521 | return null; |
| 1522 | } |
| 1523 | return $this->parseRelativeColorBody($name, array_slice($trimmed, 1)); |
| 1524 | } |
| 1525 | |
| 1526 | /** |
| 1527 | * Parse the body of `<colorFn>(from <source> <c1> <c2> <c3> |
| 1528 | * [/ alpha])` (or the `color(from <source> <space> <c1> <c2> |
| 1529 | * <c3> [/ alpha])` form for `color()`). |
| 1530 | * |
| 1531 | * @param list<Token> $tokensAfterFrom |
| 1532 | */ |
| 1533 | private function parseRelativeColorBody(string $name, array $tokensAfterFrom): ?RelativeColor |
| 1534 | { |
| 1535 | $tokensAfterFrom = self::trimWhitespace($tokensAfterFrom); |
| 1536 | |
| 1537 | // The source color is the next "value" — could be a hex |
| 1538 | // (HashToken), an ident (named color), or a function call. |
| 1539 | // Use collectFunctionLikeRun for function-call runs; for |
| 1540 | // hash / ident, just one token. |
| 1541 | if ($tokensAfterFrom === []) { |
| 1542 | return null; |
| 1543 | } |
| 1544 | $sourceConsumed = self::collectColorRun($tokensAfterFrom, 0); |
| 1545 | if ($sourceConsumed === 0) { |
| 1546 | return null; |
| 1547 | } |
| 1548 | $sourceCss = self::serializeTokens(array_slice($tokensAfterFrom, 0, $sourceConsumed)); |
| 1549 | $source = $this->parseFromString($sourceCss); |
| 1550 | // `from` accepts a concrete `<color>` OR the `currentcolor` / |
| 1551 | // `transparent` keywords (CSS Color 5 §4 — those still name |
| 1552 | // colors at the using element). The painter resolves a |
| 1553 | // keyword source to a concrete sRGB color before evaluating |
| 1554 | // the relative formula. |
| 1555 | if (!($source instanceof Color) |
| 1556 | && !($source instanceof Keyword |
| 1557 | && in_array(strtolower($source->name), ['currentcolor', 'transparent'], true)) |
| 1558 | ) { |
| 1559 | return null; |
| 1560 | } |
| 1561 | |
| 1562 | $rest = self::trimWhitespace(array_slice($tokensAfterFrom, $sourceConsumed)); |
| 1563 | |
| 1564 | // For `color()`, an additional <space> ident follows. |
| 1565 | $space = null; |
| 1566 | if ($name === 'color') { |
| 1567 | if ($rest === [] || !($rest[0] instanceof IdentToken)) { |
| 1568 | return null; |
| 1569 | } |
| 1570 | $space = match (strtolower($rest[0]->value)) { |
| 1571 | 'srgb' => ColorSpace::sRGB, |
| 1572 | 'srgb-linear' => ColorSpace::sRGBLinear, |
| 1573 | 'display-p3' => ColorSpace::DisplayP3, |
| 1574 | 'display-p3-linear' => ColorSpace::DisplayP3Linear, |
| 1575 | 'a98-rgb' => ColorSpace::A98RGB, |
| 1576 | 'a98-rgb-linear' => ColorSpace::A98RGBLinear, |
| 1577 | 'prophoto-rgb' => ColorSpace::ProPhotoRGB, |
| 1578 | 'prophoto-rgb-linear' => ColorSpace::ProPhotoRGBLinear, |
| 1579 | 'rec2020' => ColorSpace::Rec2020, |
| 1580 | 'rec2020-linear' => ColorSpace::Rec2020Linear, |
| 1581 | 'xyz', 'xyz-d65' => ColorSpace::XYZD65, |
| 1582 | 'xyz-d50' => ColorSpace::XYZD50, |
| 1583 | default => null, |
| 1584 | }; |
| 1585 | if ($space === null) { |
| 1586 | return null; |
| 1587 | } |
| 1588 | $rest = self::trimWhitespace(array_slice($rest, 1)); |
| 1589 | } else { |
| 1590 | $space = match ($name) { |
| 1591 | 'rgb', 'rgba' => ColorSpace::sRGB, |
| 1592 | 'hsl', 'hsla' => ColorSpace::sRGB, // polar in CSS; stored as sRGB |
| 1593 | 'hwb' => ColorSpace::sRGB, |
| 1594 | 'lab' => ColorSpace::Lab, |
| 1595 | 'lch' => ColorSpace::Lch, |
| 1596 | 'oklab' => ColorSpace::OKLab, |
| 1597 | 'oklch' => ColorSpace::OKLCH, |
| 1598 | default => null, |
| 1599 | }; |
| 1600 | if ($space === null) { |
| 1601 | return null; |
| 1602 | } |
| 1603 | } |
| 1604 | |
| 1605 | // Split the remainder on `/` (alpha separator) and then |
| 1606 | // by whitespace into three component groups. Use the |
| 1607 | // paren-aware splitter so `calc(r + 10)` stays one group |
| 1608 | // despite the inner whitespace. |
| 1609 | $slashGroups = self::splitTopLevelDelim($rest, '/'); |
| 1610 | $componentTokens = self::trimWhitespace($slashGroups[0]); |
| 1611 | $componentGroups = self::splitParenAwareSpaceForm($componentTokens); |
| 1612 | if (count($componentGroups) !== 3) { |
| 1613 | return null; |
| 1614 | } |
| 1615 | |
| 1616 | $c1 = $this->parseRelativeComponent($componentGroups[0]); |
| 1617 | $c2 = $this->parseRelativeComponent($componentGroups[1]); |
| 1618 | $c3 = $this->parseRelativeComponent($componentGroups[2]); |
| 1619 | if ($c1 === null || $c2 === null || $c3 === null) { |
| 1620 | return null; |
| 1621 | } |
| 1622 | |
| 1623 | $alpha = new Number(1.0); |
| 1624 | if (count($slashGroups) === 2) { |
| 1625 | $alphaTokens = self::trimWhitespace($slashGroups[1]); |
| 1626 | $parsedAlpha = $this->parseRelativeComponent($alphaTokens); |
| 1627 | if ($parsedAlpha === null) { |
| 1628 | return null; |
| 1629 | } |
| 1630 | $alpha = $parsedAlpha; |
| 1631 | } |
| 1632 | |
| 1633 | return new RelativeColor($space, $source, $c1, $c2, $c3, $alpha); |
| 1634 | } |
| 1635 | |
| 1636 | /** |
| 1637 | * Like {@see splitRgbSpaceForm} but skips whitespace / `/` |
| 1638 | * delimiters inside paren-balanced runs (function calls etc). |
| 1639 | * Lets `rgb(from red calc(r + 10) g b)` split into 3 groups |
| 1640 | * even though `calc(r + 10)` carries inner whitespace. |
| 1641 | * |
| 1642 | * @param list<Token> $tokens |
| 1643 | * @return list<list<Token>> |
| 1644 | */ |
| 1645 | private static function splitParenAwareSpaceForm(array $tokens): array |
| 1646 | { |
| 1647 | $groups = []; |
| 1648 | $current = []; |
| 1649 | $depth = 0; |
| 1650 | foreach ($tokens as $t) { |
| 1651 | if ($t instanceof LeftParenToken || $t instanceof FunctionToken) { |
| 1652 | $depth++; |
| 1653 | $current[] = $t; |
| 1654 | continue; |
| 1655 | } |
| 1656 | if ($t instanceof RightParenToken) { |
| 1657 | $depth--; |
| 1658 | $current[] = $t; |
| 1659 | continue; |
| 1660 | } |
| 1661 | if ($depth === 0 && $t instanceof WhitespaceToken) { |
| 1662 | if ($current !== []) { |
| 1663 | $groups[] = $current; |
| 1664 | $current = []; |
| 1665 | } |
| 1666 | continue; |
| 1667 | } |
| 1668 | if ($depth === 0 && $t instanceof DelimToken && $t->value === '/') { |
| 1669 | if ($current !== []) { |
| 1670 | $groups[] = $current; |
| 1671 | $current = []; |
| 1672 | } |
| 1673 | continue; |
| 1674 | } |
| 1675 | $current[] = $t; |
| 1676 | } |
| 1677 | if ($current !== []) { |
| 1678 | $groups[] = $current; |
| 1679 | } |
| 1680 | return $groups; |
| 1681 | } |
| 1682 | |
| 1683 | /** |
| 1684 | * Collect tokens for a single color value at the start of the |
| 1685 | * sequence: a hash, a function call (possibly nested), or a |
| 1686 | * single ident (named color). Whitespace consumed too. Returns |
| 1687 | * the count of tokens consumed (0 on no progress). |
| 1688 | * |
| 1689 | * @param list<Token> $tokens |
| 1690 | */ |
| 1691 | private static function collectColorRun(array $tokens, int $start): int |
| 1692 | { |
| 1693 | $head = $tokens[$start] ?? null; |
| 1694 | if ($head === null) { |
| 1695 | return 0; |
| 1696 | } |
| 1697 | if ($head instanceof FunctionToken) { |
| 1698 | return self::collectFunctionLikeRun($tokens, $start); |
| 1699 | } |
| 1700 | if ($head instanceof HashToken || $head instanceof IdentToken) { |
| 1701 | return 1; |
| 1702 | } |
| 1703 | return 0; |
| 1704 | } |
| 1705 | |
| 1706 | /** |
| 1707 | * Parse a single relative-color component expression. The |
| 1708 | * input may be an ident (e.g. `r`, `none`, `alpha`), a |
| 1709 | * number, a percentage, a dimension, or a calc()-like |
| 1710 | * function — any Value the cascade can represent. Returns |
| 1711 | * null when the token group is empty or doesn't parse. |
| 1712 | * |
| 1713 | * @param list<Token> $tokens |
| 1714 | */ |
| 1715 | private function parseRelativeComponent(array $tokens): ?Value |
| 1716 | { |
| 1717 | $tokens = self::trimWhitespace($tokens); |
| 1718 | if ($tokens === []) { |
| 1719 | return null; |
| 1720 | } |
| 1721 | $css = self::serializeTokens($tokens); |
| 1722 | if ($css === '') { |
| 1723 | return null; |
| 1724 | } |
| 1725 | return $this->parseFromString($css); |
| 1726 | } |
| 1727 | |
| 1728 | // ============================================================ |
| 1729 | // color-mix() — CSS Color 5 §3 |
| 1730 | // ============================================================ |
| 1731 | /** |
| 1732 | * Parse `color-mix(in <space> [<hue-interpolation> hue], <color> |
| 1733 | * [<percentage>], <color> [<percentage>])` per CSS Color 5 §3. |
| 1734 | * |
| 1735 | * Percentage normalisation per §3.1: |
| 1736 | * |
| 1737 | * - Both omitted → 50% / 50% |
| 1738 | * - One given (p) → other = 100% − p |
| 1739 | * - Both given, sum > 0% → multiply each by 100/(p1+p2) and |
| 1740 | * remember the original sum as |
| 1741 | * `alphaMultiplier` so the resulting |
| 1742 | * color's alpha can be scaled. |
| 1743 | * - Both 0% → invalid; return null. |
| 1744 | * |
| 1745 | * Per-space hue interpolation method is captured for polar |
| 1746 | * spaces (HSL, HWB, LCH, OKLCH) and ignored for the rest. |
| 1747 | * |
| 1748 | * @param list<Token> $tokens |
| 1749 | */ |
| 1750 | private function parseColorMixFunction(array $tokens): ?ColorMix |
| 1751 | { |
| 1752 | $tokens = self::trimWhitespace($tokens); |
| 1753 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 1754 | if (count($groups) !== 3) { |
| 1755 | return null; |
| 1756 | } |
| 1757 | |
| 1758 | // Group 0: "in <space> [<hue-interp> hue]" |
| 1759 | $methodSpec = $this->parseColorMixMethod(self::trimWhitespace($groups[0])); |
| 1760 | if ($methodSpec === null) { |
| 1761 | return null; |
| 1762 | } |
| 1763 | [$space, $hueInterpolation] = $methodSpec; |
| 1764 | |
| 1765 | // Groups 1 + 2: each is `<color> [<percentage>]`. |
| 1766 | $left = $this->parseColorMixColorAndPercent(self::trimWhitespace($groups[1])); |
| 1767 | $right = $this->parseColorMixColorAndPercent(self::trimWhitespace($groups[2])); |
| 1768 | if ($left === null || $right === null) { |
| 1769 | return null; |
| 1770 | } |
| 1771 | [$color1, $p1] = $left; |
| 1772 | [$color2, $p2] = $right; |
| 1773 | |
| 1774 | // Normalise percentages. |
| 1775 | if ($p1 === null && $p2 === null) { |
| 1776 | $p1 = 50.0; |
| 1777 | $p2 = 50.0; |
| 1778 | $alphaMultiplier = 1.0; |
| 1779 | } elseif ($p1 === null) { |
| 1780 | assert($p2 !== null); |
| 1781 | $p1 = 100.0 - $p2; |
| 1782 | $alphaMultiplier = 1.0; |
| 1783 | } elseif ($p2 === null) { |
| 1784 | $p2 = 100.0 - $p1; |
| 1785 | $alphaMultiplier = 1.0; |
| 1786 | } else { |
| 1787 | $sum = $p1 + $p2; |
| 1788 | if ($sum <= 0.0) { |
| 1789 | return null; |
| 1790 | } |
| 1791 | // Per §3.1, when both percentages are present and sum |
| 1792 | // ≠100, we scale them and remember `(p1+p2)/100` as |
| 1793 | // the alpha multiplier so the result's alpha can be |
| 1794 | // multiplied by it. |
| 1795 | $alphaMultiplier = min(1.0, $sum / 100.0); |
| 1796 | $p1 = ($p1 / $sum) * 100.0; |
| 1797 | $p2 = ($p2 / $sum) * 100.0; |
| 1798 | } |
| 1799 | |
| 1800 | return new ColorMix( |
| 1801 | space: $space, |
| 1802 | color1: $color1, |
| 1803 | percentage1: $p1, |
| 1804 | color2: $color2, |
| 1805 | percentage2: $p2, |
| 1806 | alphaMultiplier: $alphaMultiplier, |
| 1807 | hueInterpolation: $hueInterpolation, |
| 1808 | ); |
| 1809 | } |
| 1810 | |
| 1811 | /** |
| 1812 | * Parse the `in <space> [<hue-interp> hue]` head of a |
| 1813 | * color-mix() function. Returns `[ColorSpace, ?HueInterpolation]` |
| 1814 | * or null if malformed. |
| 1815 | * |
| 1816 | * @param list<Token> $tokens |
| 1817 | * @return array{0: ColorSpace, 1: ?HueInterpolation}|null |
| 1818 | */ |
| 1819 | private function parseColorMixMethod(array $tokens): ?array |
| 1820 | { |
| 1821 | if ($tokens === []) { |
| 1822 | return null; |
| 1823 | } |
| 1824 | $first = array_shift($tokens); |
| 1825 | if (!($first instanceof IdentToken) || strtolower($first->value) !== 'in') { |
| 1826 | return null; |
| 1827 | } |
| 1828 | $tokens = self::trimWhitespace($tokens); |
| 1829 | if ($tokens === []) { |
| 1830 | return null; |
| 1831 | } |
| 1832 | $spaceTok = array_shift($tokens); |
| 1833 | if (!($spaceTok instanceof IdentToken)) { |
| 1834 | return null; |
| 1835 | } |
| 1836 | $space = match (strtolower($spaceTok->value)) { |
| 1837 | 'srgb' => ColorSpace::sRGB, |
| 1838 | 'srgb-linear' => ColorSpace::sRGBLinear, |
| 1839 | 'display-p3' => ColorSpace::DisplayP3, |
| 1840 | 'display-p3-linear' => ColorSpace::DisplayP3Linear, |
| 1841 | 'a98-rgb' => ColorSpace::A98RGB, |
| 1842 | 'a98-rgb-linear' => ColorSpace::A98RGBLinear, |
| 1843 | 'prophoto-rgb' => ColorSpace::ProPhotoRGB, |
| 1844 | 'prophoto-rgb-linear' => ColorSpace::ProPhotoRGBLinear, |
| 1845 | 'rec2020' => ColorSpace::Rec2020, |
| 1846 | 'rec2020-linear' => ColorSpace::Rec2020Linear, |
| 1847 | 'lab' => ColorSpace::Lab, |
| 1848 | 'lch' => ColorSpace::Lch, |
| 1849 | 'oklab' => ColorSpace::OKLab, |
| 1850 | 'oklch' => ColorSpace::OKLCH, |
| 1851 | 'xyz', 'xyz-d65' => ColorSpace::XYZD65, |
| 1852 | 'xyz-d50' => ColorSpace::XYZD50, |
| 1853 | // HSL and HWB are polar spaces for mixing only — |
| 1854 | // they're handled by the engine via a sRGB round-trip; |
| 1855 | // we accept them at parse time but tag as sRGB so the |
| 1856 | // engine can lift back into the polar space for hue |
| 1857 | // interpolation. |
| 1858 | 'hsl', 'hwb' => ColorSpace::sRGB, |
| 1859 | default => null, |
| 1860 | }; |
| 1861 | if ($space === null) { |
| 1862 | return null; |
| 1863 | } |
| 1864 | |
| 1865 | // Optional `<hue-interp> hue` clause — only meaningful for |
| 1866 | // polar spaces. |
| 1867 | $tokens = self::trimWhitespace($tokens); |
| 1868 | if ($tokens === []) { |
| 1869 | return [$space, null]; |
| 1870 | } |
| 1871 | $hueInterp = array_shift($tokens); |
| 1872 | if (!($hueInterp instanceof IdentToken)) { |
| 1873 | return null; |
| 1874 | } |
| 1875 | $method = match (strtolower($hueInterp->value)) { |
| 1876 | 'shorter' => HueInterpolation::Shorter, |
| 1877 | 'longer' => HueInterpolation::Longer, |
| 1878 | 'increasing' => HueInterpolation::Increasing, |
| 1879 | 'decreasing' => HueInterpolation::Decreasing, |
| 1880 | default => null, |
| 1881 | }; |
| 1882 | if ($method === null) { |
| 1883 | return null; |
| 1884 | } |
| 1885 | $tokens = self::trimWhitespace($tokens); |
| 1886 | // Expect the literal `hue` keyword. |
| 1887 | if (count($tokens) !== 1 || !($tokens[0] instanceof IdentToken) || strtolower($tokens[0]->value) !== 'hue') { |
| 1888 | return null; |
| 1889 | } |
| 1890 | return [$space, $method]; |
| 1891 | } |
| 1892 | |
| 1893 | /** |
| 1894 | * Parse `<color> [<percentage>]` — the percentage may come |
| 1895 | * before or after the color per CSS Color 5 §3.1. |
| 1896 | * |
| 1897 | * @param list<Token> $tokens |
| 1898 | * @return array{0: Color, 1: ?float}|null |
| 1899 | */ |
| 1900 | private function parseColorMixColorAndPercent(array $tokens): ?array |
| 1901 | { |
| 1902 | // Find a percentage token at start or end. |
| 1903 | $percent = null; |
| 1904 | if ($tokens !== []) { |
| 1905 | $last = $tokens[count($tokens) - 1]; |
| 1906 | if ($last instanceof PercentageToken) { |
| 1907 | $percent = (float) $last->value; |
| 1908 | array_pop($tokens); |
| 1909 | } |
| 1910 | } |
| 1911 | $tokens = self::trimWhitespace($tokens); |
| 1912 | if ($percent === null && $tokens !== [] && $tokens[0] instanceof PercentageToken) { |
| 1913 | $percent = (float) $tokens[0]->value; |
| 1914 | array_shift($tokens); |
| 1915 | $tokens = self::trimWhitespace($tokens); |
| 1916 | } |
| 1917 | $tokens = self::trimWhitespace($tokens); |
| 1918 | |
| 1919 | // Whatever's left should be a parseable color. |
| 1920 | $color = $this->parseColorFromTokens($tokens); |
| 1921 | if ($color === null) { |
| 1922 | return null; |
| 1923 | } |
| 1924 | return [$color, $percent]; |
| 1925 | } |
| 1926 | |
| 1927 | /** |
| 1928 | * Parse a token sequence into a Color, dispatching to the |
| 1929 | * function / hash / named-color parsers as appropriate. Returns |
| 1930 | * null if the tokens don't resolve to a color. |
| 1931 | * |
| 1932 | * @param list<Token> $tokens |
| 1933 | */ |
| 1934 | private function parseColorFromTokens(array $tokens): ?Color |
| 1935 | { |
| 1936 | $tokens = self::trimWhitespace($tokens); |
| 1937 | if ($tokens === []) { |
| 1938 | return null; |
| 1939 | } |
| 1940 | // Re-serialise the inner tokens by stripping outer parens |
| 1941 | // and re-parsing through the public entry point so we get |
| 1942 | // hash colors, named colors, and any function-color through |
| 1943 | // one path. |
| 1944 | $css = self::serializeTokens($tokens); |
| 1945 | $value = $this->parseFromString($css); |
| 1946 | return $value instanceof Color ? $value : null; |
| 1947 | } |
| 1948 | |
| 1949 | /** |
| 1950 | * Roughly reconstruct CSS text from a token list. Adequate for |
| 1951 | * round-tripping color tokens through parseFromString. The CSS |
| 1952 | * Syntax 3 serialisation algorithm has edge cases this doesn't |
| 1953 | * cover (escape sequences, etc.) but for the well-formed color |
| 1954 | * tokens color-mix() argues over, it's enough. |
| 1955 | * |
| 1956 | * @param list<Token> $tokens |
| 1957 | */ |
| 1958 | private static function serializeTokens(array $tokens): string |
| 1959 | { |
| 1960 | $out = ''; |
| 1961 | foreach ($tokens as $t) { |
| 1962 | $out .= match (true) { |
| 1963 | $t instanceof IdentToken => $t->value, |
| 1964 | $t instanceof NumberToken => (string) $t->value, |
| 1965 | $t instanceof PercentageToken => $t->value . '%', |
| 1966 | $t instanceof DimensionToken => $t->value . $t->unit, |
| 1967 | $t instanceof HashToken => '#' . $t->value, |
| 1968 | $t instanceof StringToken => '"' . str_replace('"', '\\"', $t->value) . '"', |
| 1969 | $t instanceof FunctionToken => $t->name . '(', |
| 1970 | $t instanceof UrlToken => 'url(' . $t->value . ')', |
| 1971 | $t instanceof LeftParenToken => '(', |
| 1972 | $t instanceof RightParenToken => ')', |
| 1973 | $t instanceof CommaToken => ',', |
| 1974 | $t instanceof WhitespaceToken => ' ', |
| 1975 | $t instanceof DelimToken => $t->value, |
| 1976 | default => '', |
| 1977 | }; |
| 1978 | } |
| 1979 | return $out; |
| 1980 | } |
| 1981 | |
| 1982 | // ============================================================ |
| 1983 | // calc() / min() / max() / clamp() / sin() / cos() / ... |
| 1984 | // ============================================================ |
| 1985 | /** @param list<Token> $tokens */ |
| 1986 | private function parseCalcFunction(CalcFunction $func, array $tokens): ?Calc |
| 1987 | { |
| 1988 | $tokens = self::trimWhitespace($tokens); |
| 1989 | if ($func === CalcFunction::Calc) { |
| 1990 | $expr = $this->parseCalcSum($tokens); |
| 1991 | if ($expr === null) { |
| 1992 | return null; |
| 1993 | } |
| 1994 | return new Calc($expr); |
| 1995 | } |
| 1996 | // Multi-argument math functions: comma-separated arguments. |
| 1997 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 1998 | $args = []; |
| 1999 | foreach ($groups as $group) { |
| 2000 | $expr = $this->parseCalcSum(self::trimWhitespace($group)); |
| 2001 | if ($expr === null) { |
| 2002 | return null; |
| 2003 | } |
| 2004 | $args[] = $expr; |
| 2005 | } |
| 2006 | return new Calc(new CalcFunc($func, $args)); |
| 2007 | } |
| 2008 | |
| 2009 | /** |
| 2010 | * Parse a calc-sum expression: product (('+' | '-') product)*. Per CSS |
| 2011 | * Values 4 the +/- operators MUST have whitespace on both sides; the |
| 2012 | * tokenizer guarantees this by greedily consuming `+2`/`-2` as signed |
| 2013 | * numbers when there's no whitespace. |
| 2014 | * |
| 2015 | * @param list<Token> $tokens |
| 2016 | */ |
| 2017 | private function parseCalcSum(array $tokens): ?CalcExpression |
| 2018 | { |
| 2019 | $tokens = self::trimWhitespace($tokens); |
| 2020 | if ($tokens === []) { |
| 2021 | return null; |
| 2022 | } |
| 2023 | // Split on top-level +/- delim tokens. |
| 2024 | $parts = []; // alternating: [expr, op, expr, op, ...] |
| 2025 | $current = []; |
| 2026 | $depth = 0; |
| 2027 | foreach ($tokens as $t) { |
| 2028 | if ($depth === 0 && $t instanceof DelimToken && ($t->value === '+' || $t->value === '-')) { |
| 2029 | $parts[] = self::trimWhitespace($current); |
| 2030 | $parts[] = $t->value; |
| 2031 | $current = []; |
| 2032 | continue; |
| 2033 | } |
| 2034 | $cls = $t::class; |
| 2035 | if (str_ends_with($cls, '\\LeftParenToken') || $t instanceof FunctionToken) { |
| 2036 | $depth++; |
| 2037 | } elseif (str_ends_with($cls, '\\RightParenToken')) { |
| 2038 | if ($depth > 0) { |
| 2039 | $depth--; |
| 2040 | } |
| 2041 | } |
| 2042 | $current[] = $t; |
| 2043 | } |
| 2044 | $parts[] = self::trimWhitespace($current); |
| 2045 | |
| 2046 | $left = $this->parseCalcProduct($parts[0]); |
| 2047 | if ($left === null) { |
| 2048 | return null; |
| 2049 | } |
| 2050 | for ($i = 1; $i < count($parts); $i += 2) { |
| 2051 | $op = $parts[$i] === '+' ? CalcOp::Add : CalcOp::Sub; |
| 2052 | $right = $this->parseCalcProduct($parts[$i + 1] ?? []); |
| 2053 | if ($right === null) { |
| 2054 | return null; |
| 2055 | } |
| 2056 | $left = new CalcBinary($left, $op, $right); |
| 2057 | } |
| 2058 | return $left; |
| 2059 | } |
| 2060 | |
| 2061 | /** @param list<Token> $tokens */ |
| 2062 | private function parseCalcProduct(array $tokens): ?CalcExpression |
| 2063 | { |
| 2064 | $tokens = self::trimWhitespace($tokens); |
| 2065 | if ($tokens === []) { |
| 2066 | return null; |
| 2067 | } |
| 2068 | $parts = []; |
| 2069 | $current = []; |
| 2070 | $depth = 0; |
| 2071 | foreach ($tokens as $t) { |
| 2072 | if ($depth === 0 && $t instanceof DelimToken && ($t->value === '*' || $t->value === '/')) { |
| 2073 | $parts[] = self::trimWhitespace($current); |
| 2074 | $parts[] = $t->value; |
| 2075 | $current = []; |
| 2076 | continue; |
| 2077 | } |
| 2078 | $cls = $t::class; |
| 2079 | if (str_ends_with($cls, '\\LeftParenToken') || $t instanceof FunctionToken) { |
| 2080 | $depth++; |
| 2081 | } elseif (str_ends_with($cls, '\\RightParenToken')) { |
| 2082 | if ($depth > 0) { |
| 2083 | $depth--; |
| 2084 | } |
| 2085 | } |
| 2086 | $current[] = $t; |
| 2087 | } |
| 2088 | $parts[] = self::trimWhitespace($current); |
| 2089 | |
| 2090 | $left = $this->parseCalcValue($parts[0]); |
| 2091 | if ($left === null) { |
| 2092 | return null; |
| 2093 | } |
| 2094 | for ($i = 1; $i < count($parts); $i += 2) { |
| 2095 | $op = $parts[$i] === '*' ? CalcOp::Mul : CalcOp::Div; |
| 2096 | $right = $this->parseCalcValue($parts[$i + 1] ?? []); |
| 2097 | if ($right === null) { |
| 2098 | return null; |
| 2099 | } |
| 2100 | $left = new CalcBinary($left, $op, $right); |
| 2101 | } |
| 2102 | return $left; |
| 2103 | } |
| 2104 | |
| 2105 | /** @param list<Token> $tokens */ |
| 2106 | private function parseCalcValue(array $tokens): ?CalcExpression |
| 2107 | { |
| 2108 | $tokens = self::trimWhitespace($tokens); |
| 2109 | if ($tokens === []) { |
| 2110 | return null; |
| 2111 | } |
| 2112 | // Parenthesised expression — strip a balanced outer pair. |
| 2113 | $head = $tokens[0]; |
| 2114 | $last = $tokens[count($tokens) - 1]; |
| 2115 | if ($this->isMatchingParenWrap($tokens)) { |
| 2116 | return $this->parseCalcSum(array_slice($tokens, 1, count($tokens) - 2)); |
| 2117 | } |
| 2118 | // Inline math function — e.g. nested calc, min, max. |
| 2119 | if ($head instanceof FunctionToken && $last instanceof RightParenToken && count($tokens) >= 2) { |
| 2120 | $inner = array_slice($tokens, 1, count($tokens) - 2); |
| 2121 | $name = strtolower($head->name); |
| 2122 | $func = CalcFunction::tryFrom($name); |
| 2123 | if ($func === CalcFunction::Calc) { |
| 2124 | return $this->parseCalcSum($inner); |
| 2125 | } |
| 2126 | if ($func !== null) { |
| 2127 | $groups = self::splitTopLevel($inner, CommaToken::class); |
| 2128 | $args = []; |
| 2129 | foreach ($groups as $g) { |
| 2130 | $expr = $this->parseCalcSum(self::trimWhitespace($g)); |
| 2131 | if ($expr === null) { |
| 2132 | return null; |
| 2133 | } |
| 2134 | $args[] = $expr; |
| 2135 | } |
| 2136 | return new CalcFunc($func, $args); |
| 2137 | } |
| 2138 | return null; |
| 2139 | } |
| 2140 | // Single primitive value. |
| 2141 | if (count($tokens) === 1) { |
| 2142 | $value = $this->parseSingle($tokens); |
| 2143 | if ($value instanceof Number || $value instanceof Integer |
| 2144 | || $value instanceof Length || $value instanceof Percentage |
| 2145 | || $value instanceof Angle |
| 2146 | ) { |
| 2147 | return new CalcLeaf($value); |
| 2148 | } |
| 2149 | } |
| 2150 | return null; |
| 2151 | } |
| 2152 | |
| 2153 | /** @param list<Token> $tokens */ |
| 2154 | private function isMatchingParenWrap(array $tokens): bool |
| 2155 | { |
| 2156 | if (count($tokens) < 2) { |
| 2157 | return false; |
| 2158 | } |
| 2159 | $head = $tokens[0]; |
| 2160 | $last = $tokens[count($tokens) - 1]; |
| 2161 | if (!str_ends_with($head::class, '\\LeftParenToken')) { |
| 2162 | return false; |
| 2163 | } |
| 2164 | if (!str_ends_with($last::class, '\\RightParenToken')) { |
| 2165 | return false; |
| 2166 | } |
| 2167 | // Walk to verify the leading paren matches the trailing one (not |
| 2168 | // a separate nested pair). |
| 2169 | $depth = 0; |
| 2170 | $matched = -1; |
| 2171 | foreach ($tokens as $i => $t) { |
| 2172 | if (str_ends_with($t::class, '\\LeftParenToken') || $t instanceof FunctionToken) { |
| 2173 | $depth++; |
| 2174 | } elseif (str_ends_with($t::class, '\\RightParenToken')) { |
| 2175 | $depth--; |
| 2176 | if ($depth === 0) { |
| 2177 | $matched = $i; |
| 2178 | break; |
| 2179 | } |
| 2180 | } |
| 2181 | } |
| 2182 | return $matched === count($tokens) - 1; |
| 2183 | } |
| 2184 | |
| 2185 | // ============================================================ |
| 2186 | // linear-gradient / radial-gradient |
| 2187 | // ============================================================ |
| 2188 | /** @param list<Token> $tokens */ |
| 2189 | private function parseLinearGradient(array $tokens, bool $repeating): ?LinearGradient |
| 2190 | { |
| 2191 | $tokens = self::trimWhitespace($tokens); |
| 2192 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 2193 | if (count($groups) < 2) { |
| 2194 | return null; |
| 2195 | } |
| 2196 | // First group may be: |
| 2197 | // - angle/side spec (`45deg`, `to top right`), |
| 2198 | // - interpolation method only (`in oklch`), |
| 2199 | // - both combined (`45deg in oklch`), |
| 2200 | // - or directly a colour stop. |
| 2201 | $first = self::trimWhitespace($groups[0]); |
| 2202 | $angleDeg = 180.0; |
| 2203 | $interpSpace = null; |
| 2204 | $hueInterp = null; |
| 2205 | $stopGroups = $groups; |
| 2206 | |
| 2207 | // Pull the trailing `in <space> [<hue> hue]` clause off the |
| 2208 | // first group if it has one. Whether the remainder is an |
| 2209 | // angle/side header or empty (interpolation-only) drives |
| 2210 | // the dispatch below. |
| 2211 | [$headerTokens, $methodTokens] = $this->splitOnInterpolationKeyword($first); |
| 2212 | if ($methodTokens !== null) { |
| 2213 | $method = $this->parseColorMixMethod($methodTokens); |
| 2214 | if ($method === null) { |
| 2215 | return null; |
| 2216 | } |
| 2217 | [$interpSpace, $hueInterp] = $method; |
| 2218 | $headerTokens = self::trimWhitespace($headerTokens); |
| 2219 | if ($headerTokens === []) { |
| 2220 | // Interpolation-only header — default angle, consume |
| 2221 | // the whole first group. |
| 2222 | $stopGroups = array_slice($groups, 1); |
| 2223 | } else { |
| 2224 | $maybeAngle = $this->parseLinearAngleHeader($headerTokens); |
| 2225 | if ($maybeAngle === null) { |
| 2226 | return null; |
| 2227 | } |
| 2228 | $angleDeg = $maybeAngle; |
| 2229 | $stopGroups = array_slice($groups, 1); |
| 2230 | } |
| 2231 | } else { |
| 2232 | $maybeAngle = $this->parseLinearAngleHeader($first); |
| 2233 | if ($maybeAngle !== null) { |
| 2234 | $angleDeg = $maybeAngle; |
| 2235 | $stopGroups = array_slice($groups, 1); |
| 2236 | } |
| 2237 | } |
| 2238 | |
| 2239 | $stops = []; |
| 2240 | foreach ($stopGroups as $g) { |
| 2241 | $parsed = $this->parseGradientStop($g); |
| 2242 | if ($parsed === null) { |
| 2243 | return null; |
| 2244 | } |
| 2245 | foreach ($parsed as $stop) { |
| 2246 | $stops[] = $stop; |
| 2247 | } |
| 2248 | } |
| 2249 | if (count($stops) < 2) { |
| 2250 | return null; |
| 2251 | } |
| 2252 | return new LinearGradient( |
| 2253 | angleDeg: $angleDeg, |
| 2254 | stops: $stops, |
| 2255 | repeating: $repeating, |
| 2256 | interpolationSpace: $interpSpace, |
| 2257 | hueInterpolation: $hueInterp, |
| 2258 | ); |
| 2259 | } |
| 2260 | |
| 2261 | /** |
| 2262 | * Split a token sequence at the first top-level `in` ident |
| 2263 | * token followed by an ident (i.e. the CSS Images 4 §3.1.2 |
| 2264 | * interpolation-method clause). Returns [headerTokens, |
| 2265 | * methodTokens] — methodTokens is null when no `in` clause is |
| 2266 | * present. The returned methodTokens include the `in` keyword |
| 2267 | * itself so they can be fed straight into |
| 2268 | * {@see parseColorMixMethod}. |
| 2269 | * |
| 2270 | * @param list<Token> $tokens |
| 2271 | * @return array{0: list<Token>, 1: list<Token>|null} |
| 2272 | */ |
| 2273 | private function splitOnInterpolationKeyword(array $tokens): array |
| 2274 | { |
| 2275 | $depth = 0; |
| 2276 | $count = count($tokens); |
| 2277 | for ($i = 0; $i < $count; $i++) { |
| 2278 | $t = $tokens[$i]; |
| 2279 | if ($t instanceof FunctionToken || $t instanceof LeftParenToken) { |
| 2280 | $depth++; |
| 2281 | continue; |
| 2282 | } |
| 2283 | if ($t instanceof RightParenToken) { |
| 2284 | $depth--; |
| 2285 | continue; |
| 2286 | } |
| 2287 | if ($depth !== 0) { |
| 2288 | continue; |
| 2289 | } |
| 2290 | if ($t instanceof IdentToken && strtolower($t->value) === 'in') { |
| 2291 | // Look ahead — must be followed by another ident |
| 2292 | // (the colorspace name) to count as the interpolation |
| 2293 | // clause. Bare `in` is unlikely in any other gradient |
| 2294 | // header but the guard is cheap. |
| 2295 | for ($j = $i + 1; $j < $count; $j++) { |
| 2296 | if ($tokens[$j] instanceof WhitespaceToken) { |
| 2297 | continue; |
| 2298 | } |
| 2299 | if ($tokens[$j] instanceof IdentToken) { |
| 2300 | return [array_slice($tokens, 0, $i), array_slice($tokens, $i)]; |
| 2301 | } |
| 2302 | break; |
| 2303 | } |
| 2304 | } |
| 2305 | } |
| 2306 | return [$tokens, null]; |
| 2307 | } |
| 2308 | |
| 2309 | /** |
| 2310 | * Parse `<angle>` or `to <side-or-corner>` into degrees, or null if the |
| 2311 | * first comma-group is actually a colour stop. |
| 2312 | * |
| 2313 | * @param list<Token> $tokens |
| 2314 | */ |
| 2315 | private function parseLinearAngleHeader(array $tokens): ?float |
| 2316 | { |
| 2317 | $tokens = self::trimWhitespace($tokens); |
| 2318 | if ($tokens === []) { |
| 2319 | return null; |
| 2320 | } |
| 2321 | $head = $tokens[0]; |
| 2322 | // Direct angle: e.g. `45deg`, `0.25turn`. |
| 2323 | if ($head instanceof DimensionToken) { |
| 2324 | $unit = AngleUnit::tryFrom(strtolower($head->unit)); |
| 2325 | if ($unit !== null) { |
| 2326 | return $unit->toDegrees($head->value); |
| 2327 | } |
| 2328 | } |
| 2329 | // `to <side> [<side>]`. |
| 2330 | if ($head instanceof IdentToken && strtolower($head->value) === 'to') { |
| 2331 | $sides = []; |
| 2332 | for ($i = 1; $i < count($tokens); $i++) { |
| 2333 | if ($tokens[$i] instanceof WhitespaceToken) { |
| 2334 | continue; |
| 2335 | } |
| 2336 | if ($tokens[$i] instanceof IdentToken) { |
| 2337 | $sides[] = strtolower($tokens[$i]->value); |
| 2338 | } |
| 2339 | } |
| 2340 | return self::sidesToAngle($sides); |
| 2341 | } |
| 2342 | return null; |
| 2343 | } |
| 2344 | |
| 2345 | /** @param list<string> $sides */ |
| 2346 | private static function sidesToAngle(array $sides): float |
| 2347 | { |
| 2348 | // Per spec table. |
| 2349 | sort($sides); |
| 2350 | $key = implode(' ', $sides); |
| 2351 | return match ($key) { |
| 2352 | 'top' => 0.0, |
| 2353 | 'right top', 'top right' => 45.0, |
| 2354 | 'right' => 90.0, |
| 2355 | 'bottom right', 'right bottom' => 135.0, |
| 2356 | 'bottom' => 180.0, |
| 2357 | 'bottom left', 'left bottom' => 225.0, |
| 2358 | 'left' => 270.0, |
| 2359 | 'left top', 'top left' => 315.0, |
| 2360 | default => 180.0, |
| 2361 | }; |
| 2362 | } |
| 2363 | |
| 2364 | /** @param list<Token> $tokens */ |
| 2365 | /** |
| 2366 | * Parse one comma-delimited segment of a gradient's stop list. Per |
| 2367 | * CSS Images 4 §3.5.1 the grammar admits two position slots: |
| 2368 | * |
| 2369 | * <linear-color-stop> := <color> [<length-percentage>]{0,2} |
| 2370 | * |
| 2371 | * Two positions are shorthand for a doubled stop carrying the same |
| 2372 | * colour at each — `red 0% 50%` is equivalent to `red 0%, red 50%`. |
| 2373 | * Returning a list lets callers splat the result so the rest of the |
| 2374 | * gradient pipeline never needs to care that the shorthand existed. |
| 2375 | * |
| 2376 | * @param list<Token> $tokens |
| 2377 | * @return list<GradientStop>|null |
| 2378 | */ |
| 2379 | private function parseGradientStop(array $tokens): ?array |
| 2380 | { |
| 2381 | $tokens = self::trimWhitespace($tokens); |
| 2382 | if ($tokens === []) { |
| 2383 | return null; |
| 2384 | } |
| 2385 | $parts = self::splitOnWhitespace($tokens); |
| 2386 | if ($parts === []) { |
| 2387 | return null; |
| 2388 | } |
| 2389 | $colorValue = $this->parseSingle($parts[0]); |
| 2390 | if (!$colorValue instanceof Color) { |
| 2391 | return null; |
| 2392 | } |
| 2393 | $position1 = $this->parseStopPosition($parts[1] ?? null); |
| 2394 | $position2 = $position1 !== null |
| 2395 | ? $this->parseStopPosition($parts[2] ?? null) |
| 2396 | : null; |
| 2397 | if ($position2 !== null) { |
| 2398 | return [ |
| 2399 | new GradientStop($colorValue, $position1), |
| 2400 | new GradientStop($colorValue, $position2), |
| 2401 | ]; |
| 2402 | } |
| 2403 | return [new GradientStop($colorValue, $position1)]; |
| 2404 | } |
| 2405 | |
| 2406 | /** |
| 2407 | * Resolve a gradient stop position token list. Accepts `<length>` / |
| 2408 | * `<percentage>` and the unitless-zero form CSS Values 4 §5.2 |
| 2409 | * carves out as a valid length. Returns `null` for absent or |
| 2410 | * unrecognised tokens (caller keeps the stop with no position). |
| 2411 | * |
| 2412 | * @param list<Token>|null $tokens |
| 2413 | */ |
| 2414 | private function parseStopPosition(?array $tokens): Length|Percentage|null |
| 2415 | { |
| 2416 | if ($tokens === null) { |
| 2417 | return null; |
| 2418 | } |
| 2419 | $val = $this->parseSingle($tokens); |
| 2420 | if ($val instanceof Length || $val instanceof Percentage) { |
| 2421 | return $val; |
| 2422 | } |
| 2423 | if ($val instanceof Integer && $val->value === 0) { |
| 2424 | return new Length(0.0, LengthUnit::Px); |
| 2425 | } |
| 2426 | if ($val instanceof Number && $val->value === 0.0) { |
| 2427 | return new Length(0.0, LengthUnit::Px); |
| 2428 | } |
| 2429 | return null; |
| 2430 | } |
| 2431 | |
| 2432 | /** @param list<Token> $tokens */ |
| 2433 | private function parseRadialGradient(array $tokens, bool $repeating): ?RadialGradient |
| 2434 | { |
| 2435 | $tokens = self::trimWhitespace($tokens); |
| 2436 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 2437 | if (count($groups) < 2) { |
| 2438 | return null; |
| 2439 | } |
| 2440 | // First group MAY be shape/size [at position] [in <space>]; |
| 2441 | // otherwise it's a stop. |
| 2442 | $first = self::trimWhitespace($groups[0]); |
| 2443 | $shape = GradientShape::Ellipse; |
| 2444 | $sizeX = null; |
| 2445 | $sizeY = null; |
| 2446 | $centerX = null; |
| 2447 | $centerY = null; |
| 2448 | $interpSpace = null; |
| 2449 | $hueInterp = null; |
| 2450 | $stopGroups = $groups; |
| 2451 | [$headerTokens, $methodTokens] = $this->splitOnInterpolationKeyword($first); |
| 2452 | if ($methodTokens !== null) { |
| 2453 | $method = $this->parseColorMixMethod($methodTokens); |
| 2454 | if ($method === null) { |
| 2455 | return null; |
| 2456 | } |
| 2457 | [$interpSpace, $hueInterp] = $method; |
| 2458 | $headerTokens = self::trimWhitespace($headerTokens); |
| 2459 | if ($headerTokens === [] || $this->isRadialHeader($headerTokens)) { |
| 2460 | if ($headerTokens !== []) { |
| 2461 | [$shape, $sizeX, $sizeY, $centerX, $centerY] = $this->parseRadialHeader($headerTokens); |
| 2462 | } |
| 2463 | $stopGroups = array_slice($groups, 1); |
| 2464 | } else { |
| 2465 | return null; |
| 2466 | } |
| 2467 | } elseif ($this->isRadialHeader($first)) { |
| 2468 | [$shape, $sizeX, $sizeY, $centerX, $centerY] = $this->parseRadialHeader($first); |
| 2469 | $stopGroups = array_slice($groups, 1); |
| 2470 | } |
| 2471 | $stops = []; |
| 2472 | foreach ($stopGroups as $g) { |
| 2473 | $parsed = $this->parseGradientStop($g); |
| 2474 | if ($parsed === null) { |
| 2475 | return null; |
| 2476 | } |
| 2477 | foreach ($parsed as $stop) { |
| 2478 | $stops[] = $stop; |
| 2479 | } |
| 2480 | } |
| 2481 | if (count($stops) < 2) { |
| 2482 | return null; |
| 2483 | } |
| 2484 | return new RadialGradient( |
| 2485 | shape: $shape, |
| 2486 | sizeX: $sizeX, |
| 2487 | sizeY: $sizeY, |
| 2488 | centerX: $centerX, |
| 2489 | centerY: $centerY, |
| 2490 | stops: $stops, |
| 2491 | repeating: $repeating, |
| 2492 | interpolationSpace: $interpSpace, |
| 2493 | hueInterpolation: $hueInterp, |
| 2494 | ); |
| 2495 | } |
| 2496 | |
| 2497 | // ============================================================ |
| 2498 | // conic-gradient — CSS Backgrounds 4 / Images 4 §3.5 |
| 2499 | // ============================================================ |
| 2500 | /** |
| 2501 | * Parse `conic-gradient([from <angle>]? [at <position>]?, |
| 2502 | * <color-stop-list>)`. |
| 2503 | * |
| 2504 | * conic-gradient(red, blue) |
| 2505 | * conic-gradient(from 90deg, red, blue) |
| 2506 | * conic-gradient(at 25% 75%, red, blue) |
| 2507 | * conic-gradient(from 0deg at center, red, blue, red) |
| 2508 | * conic-gradient(red 0deg, yellow 90deg, blue 180deg) |
| 2509 | * |
| 2510 | * Stops can use angular positions (degrees) per CSS Images 4 |
| 2511 | * §3.5, but `parseGradientStop` only handles length / |
| 2512 | * percentage positions for now — angle-positioned stops fall |
| 2513 | * through to "stop position null" and the engine interpolates |
| 2514 | * uniformly. Full angular stop parsing lands once the |
| 2515 | * gradient painter ships conic rendering. |
| 2516 | * |
| 2517 | * @param list<Token> $tokens |
| 2518 | */ |
| 2519 | private function parseConicGradient(array $tokens, bool $repeating): ?ConicGradient |
| 2520 | { |
| 2521 | $tokens = self::trimWhitespace($tokens); |
| 2522 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 2523 | if (count($groups) < 2) { |
| 2524 | return null; |
| 2525 | } |
| 2526 | $first = self::trimWhitespace($groups[0]); |
| 2527 | $fromAngle = 0.0; |
| 2528 | $centerX = null; |
| 2529 | $centerY = null; |
| 2530 | $interpSpace = null; |
| 2531 | $hueInterp = null; |
| 2532 | $stopGroups = $groups; |
| 2533 | [$headerTokens, $methodTokens] = $this->splitOnInterpolationKeyword($first); |
| 2534 | if ($methodTokens !== null) { |
| 2535 | $method = $this->parseColorMixMethod($methodTokens); |
| 2536 | if ($method === null) { |
| 2537 | return null; |
| 2538 | } |
| 2539 | [$interpSpace, $hueInterp] = $method; |
| 2540 | $headerTokens = self::trimWhitespace($headerTokens); |
| 2541 | if ($headerTokens === [] || $this->isConicHeader($headerTokens)) { |
| 2542 | if ($headerTokens !== []) { |
| 2543 | $header = $this->parseConicHeader($headerTokens); |
| 2544 | if ($header === null) { |
| 2545 | return null; |
| 2546 | } |
| 2547 | [$fromAngle, $centerX, $centerY] = $header; |
| 2548 | } |
| 2549 | $stopGroups = array_slice($groups, 1); |
| 2550 | } else { |
| 2551 | return null; |
| 2552 | } |
| 2553 | } elseif ($this->isConicHeader($first)) { |
| 2554 | $header = $this->parseConicHeader($first); |
| 2555 | if ($header === null) { |
| 2556 | return null; |
| 2557 | } |
| 2558 | [$fromAngle, $centerX, $centerY] = $header; |
| 2559 | $stopGroups = array_slice($groups, 1); |
| 2560 | } |
| 2561 | if (count($stopGroups) < 2) { |
| 2562 | return null; |
| 2563 | } |
| 2564 | $stops = []; |
| 2565 | foreach ($stopGroups as $g) { |
| 2566 | $parsed = $this->parseGradientStop($g); |
| 2567 | if ($parsed === null) { |
| 2568 | return null; |
| 2569 | } |
| 2570 | foreach ($parsed as $stop) { |
| 2571 | $stops[] = $stop; |
| 2572 | } |
| 2573 | } |
| 2574 | return new ConicGradient( |
| 2575 | fromAngleDeg: $fromAngle, |
| 2576 | centerX: $centerX, |
| 2577 | centerY: $centerY, |
| 2578 | stops: $stops, |
| 2579 | repeating: $repeating, |
| 2580 | interpolationSpace: $interpSpace, |
| 2581 | hueInterpolation: $hueInterp, |
| 2582 | ); |
| 2583 | } |
| 2584 | |
| 2585 | /** @param list<Token> $tokens */ |
| 2586 | private function isConicHeader(array $tokens): bool |
| 2587 | { |
| 2588 | foreach ($tokens as $t) { |
| 2589 | if ($t instanceof IdentToken |
| 2590 | && in_array(strtolower($t->value), ['from', 'at'], true) |
| 2591 | ) { |
| 2592 | return true; |
| 2593 | } |
| 2594 | } |
| 2595 | return false; |
| 2596 | } |
| 2597 | |
| 2598 | /** |
| 2599 | * Parse the optional `from <angle> [at <position>]` / |
| 2600 | * `at <position>` header of a conic-gradient. |
| 2601 | * |
| 2602 | * @param list<Token> $tokens |
| 2603 | * @return array{0: float, 1: ?float, 2: ?float}|null |
| 2604 | */ |
| 2605 | private function parseConicHeader(array $tokens): ?array |
| 2606 | { |
| 2607 | $fromAngle = 0.0; |
| 2608 | $centerX = null; |
| 2609 | $centerY = null; |
| 2610 | |
| 2611 | // Walk the tokens looking for `from <angle>` followed by |
| 2612 | // optional `at <position-x> <position-y>`. Both clauses |
| 2613 | // optional but at least one of them must be present (the |
| 2614 | // caller's `isConicHeader` already verified that). |
| 2615 | $i = 0; |
| 2616 | $count = count($tokens); |
| 2617 | while ($i < $count) { |
| 2618 | $t = $tokens[$i]; |
| 2619 | if ($t instanceof WhitespaceToken) { |
| 2620 | $i++; |
| 2621 | continue; |
| 2622 | } |
| 2623 | if ($t instanceof IdentToken && strtolower($t->value) === 'from') { |
| 2624 | $i++; |
| 2625 | // Skip whitespace. |
| 2626 | while ($i < $count && $tokens[$i] instanceof WhitespaceToken) { |
| 2627 | $i++; |
| 2628 | } |
| 2629 | if ($i >= $count) { |
| 2630 | return null; |
| 2631 | } |
| 2632 | $angleTok = $tokens[$i]; |
| 2633 | if (!($angleTok instanceof DimensionToken) && !($angleTok instanceof NumberToken)) { |
| 2634 | return null; |
| 2635 | } |
| 2636 | if ($angleTok instanceof DimensionToken) { |
| 2637 | $unit = AngleUnit::tryFrom(strtolower($angleTok->unit)); |
| 2638 | if ($unit === null) { |
| 2639 | return null; |
| 2640 | } |
| 2641 | $fromAngle = $unit->toDegrees((float) $angleTok->value); |
| 2642 | } else { |
| 2643 | $fromAngle = (float) $angleTok->value; |
| 2644 | } |
| 2645 | $fromAngle = fmod(fmod($fromAngle, 360.0) + 360.0, 360.0); |
| 2646 | $i++; |
| 2647 | continue; |
| 2648 | } |
| 2649 | if ($t instanceof IdentToken && strtolower($t->value) === 'at') { |
| 2650 | $i++; |
| 2651 | // Collect the next two position values. |
| 2652 | $positions = []; |
| 2653 | while ($i < $count && count($positions) < 2) { |
| 2654 | $p = $tokens[$i]; |
| 2655 | if ($p instanceof WhitespaceToken) { |
| 2656 | $i++; |
| 2657 | continue; |
| 2658 | } |
| 2659 | if ($p instanceof PercentageToken) { |
| 2660 | $positions[] = (float) $p->value / 100.0; |
| 2661 | $i++; |
| 2662 | continue; |
| 2663 | } |
| 2664 | if ($p instanceof IdentToken) { |
| 2665 | $name = strtolower($p->value); |
| 2666 | $val = match ($name) { |
| 2667 | 'left', 'top' => 0.0, |
| 2668 | 'center', 'centre' => 0.5, |
| 2669 | 'right', 'bottom' => 1.0, |
| 2670 | default => null, |
| 2671 | }; |
| 2672 | if ($val === null) { |
| 2673 | return null; |
| 2674 | } |
| 2675 | $positions[] = $val; |
| 2676 | $i++; |
| 2677 | continue; |
| 2678 | } |
| 2679 | return null; |
| 2680 | } |
| 2681 | if ($positions === []) { |
| 2682 | return null; |
| 2683 | } |
| 2684 | $centerX = $positions[0]; |
| 2685 | $centerY = $positions[1] ?? $positions[0]; |
| 2686 | continue; |
| 2687 | } |
| 2688 | // Unknown header token. |
| 2689 | return null; |
| 2690 | } |
| 2691 | return [$fromAngle, $centerX, $centerY]; |
| 2692 | } |
| 2693 | |
| 2694 | // ============================================================ |
| 2695 | // anchor() / anchor-size() — CSS Anchor Positioning 1 §6, §7 |
| 2696 | // ============================================================ |
| 2697 | /** @param list<Token> $tokens */ |
| 2698 | private function parseAnchorFunction(array $tokens): ?AnchorFunction |
| 2699 | { |
| 2700 | return $this->parseAnchorOrSize( |
| 2701 | $tokens, |
| 2702 | ['top', 'bottom', 'left', 'right', 'start', 'end', |
| 2703 | 'self-start', 'self-end', 'center', 'inside', 'outside'], |
| 2704 | isSize: false, |
| 2705 | ); |
| 2706 | } |
| 2707 | |
| 2708 | /** @param list<Token> $tokens */ |
| 2709 | private function parseAnchorSizeFunction(array $tokens): ?AnchorSizeFunction |
| 2710 | { |
| 2711 | return $this->parseAnchorOrSize( |
| 2712 | $tokens, |
| 2713 | ['width', 'height', 'block', 'inline', 'self-block', 'self-inline'], |
| 2714 | isSize: true, |
| 2715 | ); |
| 2716 | } |
| 2717 | |
| 2718 | /** |
| 2719 | * Shared parser for `anchor()` / `anchor-size()`. The two |
| 2720 | * differ only in the keyword vocabulary their middle slot |
| 2721 | * accepts. |
| 2722 | * |
| 2723 | * @param list<Token> $tokens |
| 2724 | * @param list<string> $validSideKeywords |
| 2725 | * @return AnchorFunction|AnchorSizeFunction|null |
| 2726 | */ |
| 2727 | private function parseAnchorOrSize(array $tokens, array $validSideKeywords, bool $isSize): AnchorFunction|AnchorSizeFunction|null |
| 2728 | { |
| 2729 | $tokens = self::trimWhitespace($tokens); |
| 2730 | // Split on top-level comma — yields [main, fallback?]. |
| 2731 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 2732 | if (count($commaGroups) < 1 || count($commaGroups) > 2) { |
| 2733 | return null; |
| 2734 | } |
| 2735 | $mainGroup = self::trimWhitespace($commaGroups[0]); |
| 2736 | if ($mainGroup === []) { |
| 2737 | return null; |
| 2738 | } |
| 2739 | |
| 2740 | $anchorName = null; |
| 2741 | $first = $mainGroup[0]; |
| 2742 | // `--my-anchor` starts with `--`; the tokenizer emits this |
| 2743 | // as an IdentToken whose value starts with `--`. |
| 2744 | if ($first instanceof IdentToken && str_starts_with($first->value, '--')) { |
| 2745 | $anchorName = $first->value; |
| 2746 | $mainGroup = self::trimWhitespace(array_slice($mainGroup, 1)); |
| 2747 | if ($mainGroup === []) { |
| 2748 | return null; |
| 2749 | } |
| 2750 | } |
| 2751 | |
| 2752 | // The middle slot — keyword from the per-function list, |
| 2753 | // or a percentage (anchor() only). |
| 2754 | if (count($mainGroup) !== 1) { |
| 2755 | return null; |
| 2756 | } |
| 2757 | $sideTok = $mainGroup[0]; |
| 2758 | $side = null; |
| 2759 | if ($sideTok instanceof IdentToken |
| 2760 | && in_array(strtolower($sideTok->value), $validSideKeywords, true) |
| 2761 | ) { |
| 2762 | $side = new Keyword(strtolower($sideTok->value)); |
| 2763 | } elseif (!$isSize && $sideTok instanceof PercentageToken) { |
| 2764 | $side = new Percentage((float) $sideTok->value); |
| 2765 | } |
| 2766 | if ($side === null) { |
| 2767 | return null; |
| 2768 | } |
| 2769 | |
| 2770 | // Optional fallback expression. |
| 2771 | $fallback = null; |
| 2772 | if (count($commaGroups) === 2) { |
| 2773 | $fallbackCss = self::serializeTokens(self::trimWhitespace($commaGroups[1])); |
| 2774 | $fallback = $this->parseFromString($fallbackCss); |
| 2775 | } |
| 2776 | |
| 2777 | return $isSize |
| 2778 | ? new AnchorSizeFunction($anchorName, $side, $fallback) |
| 2779 | : new AnchorFunction($anchorName, $side, $fallback); |
| 2780 | } |
| 2781 | |
| 2782 | // ============================================================ |
| 2783 | // basic-shape — CSS Shapes 1 §3 |
| 2784 | // ============================================================ |
| 2785 | /** |
| 2786 | * Dispatch for the four most commonly-used basic shapes. |
| 2787 | * `path()`, `rect()`, `xywh()` (CSS Shapes 2) still fall |
| 2788 | * through to generic CssFunction. |
| 2789 | * |
| 2790 | * @param list<Token> $tokens |
| 2791 | */ |
| 2792 | private function parseBasicShape(string $name, array $tokens): ?BasicShape |
| 2793 | { |
| 2794 | return match ($name) { |
| 2795 | 'circle' => $this->parseCircleShape($tokens), |
| 2796 | 'ellipse' => $this->parseEllipseShape($tokens), |
| 2797 | 'inset' => $this->parseInsetShape($tokens), |
| 2798 | 'polygon' => $this->parsePolygonShape($tokens), |
| 2799 | 'rect' => $this->parseRectShape($tokens), |
| 2800 | 'xywh' => $this->parseXywhShape($tokens), |
| 2801 | 'path' => $this->parsePathShape($tokens), |
| 2802 | default => null, |
| 2803 | }; |
| 2804 | } |
| 2805 | |
| 2806 | /** @param list<Token> $tokens */ |
| 2807 | private function parseRectShape(array $tokens): ?RectShape |
| 2808 | { |
| 2809 | $tokens = self::trimWhitespace($tokens); |
| 2810 | if ($tokens === []) { |
| 2811 | return null; |
| 2812 | } |
| 2813 | [$edgeTokens, $roundTokens] = self::splitOnRoundKeyword($tokens); |
| 2814 | $edgeGroups = self::splitParenAwareSpaceForm(self::trimWhitespace($edgeTokens)); |
| 2815 | if (count($edgeGroups) !== 4) { |
| 2816 | return null; |
| 2817 | } |
| 2818 | $edges = []; |
| 2819 | foreach ($edgeGroups as $group) { |
| 2820 | $value = $this->parseFromString(self::serializeTokens(self::trimWhitespace($group))); |
| 2821 | if (!self::isShapePositionValue($value) |
| 2822 | && !($value instanceof Keyword && strtolower($value->name) === 'auto') |
| 2823 | ) { |
| 2824 | return null; |
| 2825 | } |
| 2826 | $edges[] = $value; |
| 2827 | } |
| 2828 | $radius = null; |
| 2829 | if ($roundTokens !== []) { |
| 2830 | $roundGroups = self::splitParenAwareSpaceForm(self::trimWhitespace($roundTokens)); |
| 2831 | $radius = []; |
| 2832 | foreach ($roundGroups as $group) { |
| 2833 | $radius[] = $this->parseFromString(self::serializeTokens(self::trimWhitespace($group))); |
| 2834 | } |
| 2835 | if ($radius === []) { |
| 2836 | $radius = null; |
| 2837 | } |
| 2838 | } |
| 2839 | return new RectShape($edges, $radius); |
| 2840 | } |
| 2841 | |
| 2842 | /** @param list<Token> $tokens */ |
| 2843 | private function parseXywhShape(array $tokens): ?XywhShape |
| 2844 | { |
| 2845 | $tokens = self::trimWhitespace($tokens); |
| 2846 | if ($tokens === []) { |
| 2847 | return null; |
| 2848 | } |
| 2849 | [$mainTokens, $roundTokens] = self::splitOnRoundKeyword($tokens); |
| 2850 | $groups = self::splitParenAwareSpaceForm(self::trimWhitespace($mainTokens)); |
| 2851 | if (count($groups) !== 4) { |
| 2852 | return null; |
| 2853 | } |
| 2854 | $values = []; |
| 2855 | foreach ($groups as $group) { |
| 2856 | $value = $this->parseFromString(self::serializeTokens(self::trimWhitespace($group))); |
| 2857 | if (!self::isShapePositionValue($value)) { |
| 2858 | return null; |
| 2859 | } |
| 2860 | $values[] = $value; |
| 2861 | } |
| 2862 | $radius = null; |
| 2863 | if ($roundTokens !== []) { |
| 2864 | $roundGroups = self::splitParenAwareSpaceForm(self::trimWhitespace($roundTokens)); |
| 2865 | $radius = []; |
| 2866 | foreach ($roundGroups as $group) { |
| 2867 | $radius[] = $this->parseFromString(self::serializeTokens(self::trimWhitespace($group))); |
| 2868 | } |
| 2869 | if ($radius === []) { |
| 2870 | $radius = null; |
| 2871 | } |
| 2872 | } |
| 2873 | return new XywhShape($values[0], $values[1], $values[2], $values[3], $radius); |
| 2874 | } |
| 2875 | |
| 2876 | /** @param list<Token> $tokens */ |
| 2877 | private function parsePathShape(array $tokens): ?PathShape |
| 2878 | { |
| 2879 | $tokens = self::trimWhitespace($tokens); |
| 2880 | if ($tokens === []) { |
| 2881 | return null; |
| 2882 | } |
| 2883 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 2884 | $fillRule = 'nonzero'; |
| 2885 | // Optional leading fill-rule ident. |
| 2886 | if (count($commaGroups) === 2) { |
| 2887 | $first = self::trimWhitespace($commaGroups[0]); |
| 2888 | if (count($first) !== 1 || !($first[0] instanceof IdentToken)) { |
| 2889 | return null; |
| 2890 | } |
| 2891 | $rule = strtolower($first[0]->value); |
| 2892 | if ($rule !== 'nonzero' && $rule !== 'evenodd') { |
| 2893 | return null; |
| 2894 | } |
| 2895 | $fillRule = $rule; |
| 2896 | $pathGroup = $commaGroups[1]; |
| 2897 | } else { |
| 2898 | $pathGroup = $commaGroups[0]; |
| 2899 | } |
| 2900 | // Path data string. |
| 2901 | $pathTokens = self::trimWhitespace($pathGroup); |
| 2902 | if (count($pathTokens) !== 1 || !($pathTokens[0] instanceof StringToken)) { |
| 2903 | return null; |
| 2904 | } |
| 2905 | return new PathShape($fillRule, $pathTokens[0]->value); |
| 2906 | } |
| 2907 | |
| 2908 | /** @param list<Token> $tokens */ |
| 2909 | private function parseCircleShape(array $tokens): ?CircleShape |
| 2910 | { |
| 2911 | $tokens = self::trimWhitespace($tokens); |
| 2912 | // Possible forms: |
| 2913 | // circle() |
| 2914 | // circle(<radius>) |
| 2915 | // circle(at <position>) |
| 2916 | // circle(<radius> at <position>) |
| 2917 | if ($tokens === []) { |
| 2918 | return new CircleShape(); |
| 2919 | } |
| 2920 | // Look for the `at` keyword to split radius from position. |
| 2921 | [$radiusTokens, $positionTokens] = self::splitOnAtKeyword($tokens); |
| 2922 | $radius = $radiusTokens === [] ? null : $this->parseShapeRadius($radiusTokens); |
| 2923 | if ($radiusTokens !== [] && $radius === null) { |
| 2924 | return null; |
| 2925 | } |
| 2926 | [$cx, $cy] = $this->parsePositionXY($positionTokens); |
| 2927 | return new CircleShape($radius, $cx, $cy); |
| 2928 | } |
| 2929 | |
| 2930 | /** @param list<Token> $tokens */ |
| 2931 | private function parseEllipseShape(array $tokens): ?EllipseShape |
| 2932 | { |
| 2933 | $tokens = self::trimWhitespace($tokens); |
| 2934 | if ($tokens === []) { |
| 2935 | return new EllipseShape(); |
| 2936 | } |
| 2937 | [$radiusTokens, $positionTokens] = self::splitOnAtKeyword($tokens); |
| 2938 | $rx = null; |
| 2939 | $ry = null; |
| 2940 | if ($radiusTokens !== []) { |
| 2941 | // Expect two space-separated radius tokens. |
| 2942 | $rGroups = self::splitParenAwareSpaceForm($radiusTokens); |
| 2943 | if (count($rGroups) !== 2) { |
| 2944 | return null; |
| 2945 | } |
| 2946 | $rx = $this->parseShapeRadius($rGroups[0]); |
| 2947 | $ry = $this->parseShapeRadius($rGroups[1]); |
| 2948 | if ($rx === null || $ry === null) { |
| 2949 | return null; |
| 2950 | } |
| 2951 | } |
| 2952 | [$cx, $cy] = $this->parsePositionXY($positionTokens); |
| 2953 | return new EllipseShape($rx, $ry, $cx, $cy); |
| 2954 | } |
| 2955 | |
| 2956 | /** @param list<Token> $tokens */ |
| 2957 | private function parseInsetShape(array $tokens): ?InsetShape |
| 2958 | { |
| 2959 | $tokens = self::trimWhitespace($tokens); |
| 2960 | if ($tokens === []) { |
| 2961 | return null; |
| 2962 | } |
| 2963 | // Split on `round` keyword if present. |
| 2964 | [$insetTokens, $roundTokens] = self::splitOnRoundKeyword($tokens); |
| 2965 | $insetGroups = self::splitParenAwareSpaceForm(self::trimWhitespace($insetTokens)); |
| 2966 | if (count($insetGroups) < 1 || count($insetGroups) > 4) { |
| 2967 | return null; |
| 2968 | } |
| 2969 | $insets = []; |
| 2970 | foreach ($insetGroups as $group) { |
| 2971 | $value = $this->parseFromString(self::serializeTokens(self::trimWhitespace($group))); |
| 2972 | if (!self::isShapePositionValue($value)) { |
| 2973 | return null; |
| 2974 | } |
| 2975 | $insets[] = $value; |
| 2976 | } |
| 2977 | $radius = null; |
| 2978 | if ($roundTokens !== []) { |
| 2979 | $roundGroups = self::splitParenAwareSpaceForm(self::trimWhitespace($roundTokens)); |
| 2980 | $radius = []; |
| 2981 | foreach ($roundGroups as $group) { |
| 2982 | $radius[] = $this->parseFromString(self::serializeTokens(self::trimWhitespace($group))); |
| 2983 | } |
| 2984 | if ($radius === []) { |
| 2985 | $radius = null; |
| 2986 | } |
| 2987 | } |
| 2988 | return new InsetShape($insets, $radius); |
| 2989 | } |
| 2990 | |
| 2991 | /** @param list<Token> $tokens */ |
| 2992 | private function parsePolygonShape(array $tokens): ?PolygonShape |
| 2993 | { |
| 2994 | $tokens = self::trimWhitespace($tokens); |
| 2995 | if ($tokens === []) { |
| 2996 | return null; |
| 2997 | } |
| 2998 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 2999 | if ($commaGroups === []) { |
| 3000 | return null; |
| 3001 | } |
| 3002 | $fillRule = 'nonzero'; |
| 3003 | // Detect leading fill-rule ident. |
| 3004 | $firstGroup = self::trimWhitespace($commaGroups[0]); |
| 3005 | if ($firstGroup !== [] && $firstGroup[0] instanceof IdentToken) { |
| 3006 | $rule = strtolower($firstGroup[0]->value); |
| 3007 | if ($rule === 'nonzero' || $rule === 'evenodd') { |
| 3008 | $fillRule = $rule; |
| 3009 | // Remove the fill-rule ident from the first group. |
| 3010 | $remainder = self::trimWhitespace(array_slice($firstGroup, 1)); |
| 3011 | if ($remainder !== []) { |
| 3012 | $commaGroups[0] = $remainder; |
| 3013 | } else { |
| 3014 | array_shift($commaGroups); |
| 3015 | } |
| 3016 | } |
| 3017 | } |
| 3018 | $vertices = []; |
| 3019 | foreach ($commaGroups as $group) { |
| 3020 | $group = self::trimWhitespace($group); |
| 3021 | $parts = self::splitParenAwareSpaceForm($group); |
| 3022 | if (count($parts) !== 2) { |
| 3023 | return null; |
| 3024 | } |
| 3025 | $x = $this->parseFromString(self::serializeTokens(self::trimWhitespace($parts[0]))); |
| 3026 | $y = $this->parseFromString(self::serializeTokens(self::trimWhitespace($parts[1]))); |
| 3027 | // Polygon vertices accept length / percentage / calc / number |
| 3028 | // (bare `0` parses as Integer; treat zeros as 0px). |
| 3029 | if (!self::isShapePositionValue($x) || !self::isShapePositionValue($y)) { |
| 3030 | return null; |
| 3031 | } |
| 3032 | $vertices[] = [$x, $y]; |
| 3033 | } |
| 3034 | if ($vertices === []) { |
| 3035 | return null; |
| 3036 | } |
| 3037 | return new PolygonShape($fillRule, $vertices); |
| 3038 | } |
| 3039 | |
| 3040 | /** |
| 3041 | * Accept the set of value types that may appear in a basic- |
| 3042 | * shape vertex / inset slot: Length, Percentage, Calc, plus |
| 3043 | * the literal `0` zero shorthand (Integer / Number). |
| 3044 | */ |
| 3045 | private static function isShapePositionValue(?Value $value): bool |
| 3046 | { |
| 3047 | return $value instanceof Length |
| 3048 | || $value instanceof Percentage |
| 3049 | || $value instanceof Calc |
| 3050 | || $value instanceof Integer |
| 3051 | || $value instanceof Number; |
| 3052 | } |
| 3053 | |
| 3054 | /** |
| 3055 | * Parse a `<shape-radius>` — Length / Percentage / Keyword |
| 3056 | * (`closest-side` or `farthest-side`). |
| 3057 | * |
| 3058 | * @param list<Token> $tokens |
| 3059 | */ |
| 3060 | private function parseShapeRadius(array $tokens): ?Value |
| 3061 | { |
| 3062 | $tokens = self::trimWhitespace($tokens); |
| 3063 | if ($tokens === []) { |
| 3064 | return null; |
| 3065 | } |
| 3066 | if (count($tokens) === 1 && $tokens[0] instanceof IdentToken) { |
| 3067 | $kw = strtolower($tokens[0]->value); |
| 3068 | if ($kw === 'closest-side' || $kw === 'farthest-side') { |
| 3069 | return new Keyword($kw); |
| 3070 | } |
| 3071 | } |
| 3072 | $value = $this->parseFromString(self::serializeTokens($tokens)); |
| 3073 | if ($value instanceof Length || $value instanceof Percentage || $value instanceof Calc) { |
| 3074 | return $value; |
| 3075 | } |
| 3076 | return null; |
| 3077 | } |
| 3078 | |
| 3079 | /** |
| 3080 | * Parse a `<position>` token sequence into `[centerX, centerY]` |
| 3081 | * Value pairs. Accepts: |
| 3082 | * - empty list → [null, null] |
| 3083 | * - single keyword → applies to both axes via shape semantics |
| 3084 | * - two values (keywords / percentages / lengths) → x then y |
| 3085 | * |
| 3086 | * @param list<Token> $tokens |
| 3087 | * @return array{?Value, ?Value} |
| 3088 | */ |
| 3089 | private function parsePositionXY(array $tokens): array |
| 3090 | { |
| 3091 | if ($tokens === []) { |
| 3092 | return [null, null]; |
| 3093 | } |
| 3094 | $groups = self::splitParenAwareSpaceForm(self::trimWhitespace($tokens)); |
| 3095 | $values = []; |
| 3096 | foreach ($groups as $group) { |
| 3097 | $group = self::trimWhitespace($group); |
| 3098 | if ($group === []) { |
| 3099 | continue; |
| 3100 | } |
| 3101 | // Position keywords (left / center / right / top / bottom). |
| 3102 | if (count($group) === 1 && $group[0] instanceof IdentToken) { |
| 3103 | $kw = strtolower($group[0]->value); |
| 3104 | if (in_array($kw, ['left', 'center', 'right', 'top', 'bottom'], true)) { |
| 3105 | $values[] = new Keyword($kw); |
| 3106 | continue; |
| 3107 | } |
| 3108 | } |
| 3109 | $value = $this->parseFromString(self::serializeTokens($group)); |
| 3110 | $values[] = $value; |
| 3111 | } |
| 3112 | if (count($values) === 1) { |
| 3113 | return [$values[0], $values[0]]; |
| 3114 | } |
| 3115 | if (count($values) === 2) { |
| 3116 | return [$values[0], $values[1]]; |
| 3117 | } |
| 3118 | return [null, null]; |
| 3119 | } |
| 3120 | |
| 3121 | /** |
| 3122 | * Split a token sequence at the first top-level `at` ident. |
| 3123 | * |
| 3124 | * @param list<Token> $tokens |
| 3125 | * @return array{list<Token>, list<Token>} |
| 3126 | */ |
| 3127 | private static function splitOnAtKeyword(array $tokens): array |
| 3128 | { |
| 3129 | $depth = 0; |
| 3130 | foreach ($tokens as $i => $t) { |
| 3131 | if ($t instanceof LeftParenToken || $t instanceof FunctionToken) { |
| 3132 | $depth++; |
| 3133 | continue; |
| 3134 | } |
| 3135 | if ($t instanceof RightParenToken) { |
| 3136 | $depth--; |
| 3137 | continue; |
| 3138 | } |
| 3139 | if ($depth === 0 && $t instanceof IdentToken && strtolower($t->value) === 'at') { |
| 3140 | return [ |
| 3141 | self::trimWhitespace(array_slice($tokens, 0, $i)), |
| 3142 | self::trimWhitespace(array_slice($tokens, $i + 1)), |
| 3143 | ]; |
| 3144 | } |
| 3145 | } |
| 3146 | return [self::trimWhitespace($tokens), []]; |
| 3147 | } |
| 3148 | |
| 3149 | /** |
| 3150 | * Split a token sequence at the first top-level `round` ident |
| 3151 | * (CSS Shapes 1 `inset()` round-corner separator). |
| 3152 | * |
| 3153 | * @param list<Token> $tokens |
| 3154 | * @return array{list<Token>, list<Token>} |
| 3155 | */ |
| 3156 | private static function splitOnRoundKeyword(array $tokens): array |
| 3157 | { |
| 3158 | $depth = 0; |
| 3159 | foreach ($tokens as $i => $t) { |
| 3160 | if ($t instanceof LeftParenToken || $t instanceof FunctionToken) { |
| 3161 | $depth++; |
| 3162 | continue; |
| 3163 | } |
| 3164 | if ($t instanceof RightParenToken) { |
| 3165 | $depth--; |
| 3166 | continue; |
| 3167 | } |
| 3168 | if ($depth === 0 && $t instanceof IdentToken && strtolower($t->value) === 'round') { |
| 3169 | return [ |
| 3170 | self::trimWhitespace(array_slice($tokens, 0, $i)), |
| 3171 | self::trimWhitespace(array_slice($tokens, $i + 1)), |
| 3172 | ]; |
| 3173 | } |
| 3174 | } |
| 3175 | return [self::trimWhitespace($tokens), []]; |
| 3176 | } |
| 3177 | |
| 3178 | // ============================================================ |
| 3179 | // cubic-bezier() + steps() — CSS Easing 1 §3.4 / §3.5 |
| 3180 | // ============================================================ |
| 3181 | /** @param list<Token> $tokens */ |
| 3182 | private function parseCubicBezierFunction(array $tokens): ?CubicBezier |
| 3183 | { |
| 3184 | $tokens = self::trimWhitespace($tokens); |
| 3185 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 3186 | if (count($commaGroups) !== 4) { |
| 3187 | return null; |
| 3188 | } |
| 3189 | $values = []; |
| 3190 | foreach ($commaGroups as $group) { |
| 3191 | $g = self::trimWhitespace($group); |
| 3192 | if (count($g) !== 1 || !($g[0] instanceof NumberToken)) { |
| 3193 | return null; |
| 3194 | } |
| 3195 | $values[] = (float) $g[0]->value; |
| 3196 | } |
| 3197 | // CSS Easing 1 §3.4 — x coordinates must be in [0, 1]. |
| 3198 | if ($values[0] < 0.0 || $values[0] > 1.0 || $values[2] < 0.0 || $values[2] > 1.0) { |
| 3199 | return null; |
| 3200 | } |
| 3201 | return new CubicBezier($values[0], $values[1], $values[2], $values[3]); |
| 3202 | } |
| 3203 | |
| 3204 | /** @param list<Token> $tokens */ |
| 3205 | private function parseStepsFunction(array $tokens): ?StepsEasing |
| 3206 | { |
| 3207 | $tokens = self::trimWhitespace($tokens); |
| 3208 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 3209 | if (count($commaGroups) < 1 || count($commaGroups) > 2) { |
| 3210 | return null; |
| 3211 | } |
| 3212 | // Count. |
| 3213 | $countTokens = self::trimWhitespace($commaGroups[0]); |
| 3214 | if (count($countTokens) !== 1 || !($countTokens[0] instanceof NumberToken)) { |
| 3215 | return null; |
| 3216 | } |
| 3217 | $countValue = $countTokens[0]->value; |
| 3218 | if ($countValue !== floor($countValue) || $countValue < 1) { |
| 3219 | return null; |
| 3220 | } |
| 3221 | $count = (int) $countValue; |
| 3222 | // Optional jump term. |
| 3223 | $jump = StepsJumpTerm::End; |
| 3224 | if (count($commaGroups) === 2) { |
| 3225 | $jumpTokens = self::trimWhitespace($commaGroups[1]); |
| 3226 | if (count($jumpTokens) !== 1 || !($jumpTokens[0] instanceof IdentToken)) { |
| 3227 | return null; |
| 3228 | } |
| 3229 | $parsed = StepsJumpTerm::tryFrom(strtolower($jumpTokens[0]->value)); |
| 3230 | if ($parsed === null) { |
| 3231 | return null; |
| 3232 | } |
| 3233 | $jump = $parsed; |
| 3234 | } |
| 3235 | return new StepsEasing($count, $jump); |
| 3236 | } |
| 3237 | |
| 3238 | // ============================================================ |
| 3239 | // linear() — CSS Easing 2 §3.1 |
| 3240 | // ============================================================ |
| 3241 | /** |
| 3242 | * Parse `linear(<linear-stop-list>)` where each stop is |
| 3243 | * `<number> [<percentage>]?` (CSS Easing 2 §3.1) or the range |
| 3244 | * form `<number> <percentage> <percentage>` (§3.2). Returns |
| 3245 | * null when the stop list is empty or malformed. |
| 3246 | * |
| 3247 | * @param list<Token> $tokens |
| 3248 | */ |
| 3249 | private function parseLinearEasingFunction(array $tokens): ?LinearEasing |
| 3250 | { |
| 3251 | $tokens = self::trimWhitespace($tokens); |
| 3252 | if ($tokens === []) { |
| 3253 | return null; |
| 3254 | } |
| 3255 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 3256 | $stops = []; |
| 3257 | foreach ($groups as $group) { |
| 3258 | $group = self::trimWhitespace($group); |
| 3259 | $parts = self::splitParenAwareSpaceForm($group); |
| 3260 | if (count($parts) === 0 || count($parts) > 3) { |
| 3261 | return null; |
| 3262 | } |
| 3263 | // First part is the output number. |
| 3264 | $outputTokens = self::trimWhitespace($parts[0]); |
| 3265 | if (count($outputTokens) !== 1 || !($outputTokens[0] instanceof NumberToken)) { |
| 3266 | return null; |
| 3267 | } |
| 3268 | $output = (float) $outputTokens[0]->value; |
| 3269 | |
| 3270 | // Range form: 3 parts (output, percentageFrom, percentageTo) |
| 3271 | // emits two stops sharing the output. |
| 3272 | if (count($parts) === 3) { |
| 3273 | $fromPct = self::extractSinglePercentage(self::trimWhitespace($parts[1])); |
| 3274 | $toPct = self::extractSinglePercentage(self::trimWhitespace($parts[2])); |
| 3275 | if ($fromPct === null || $toPct === null) { |
| 3276 | return null; |
| 3277 | } |
| 3278 | $stops[] = new LinearEasingStop($output, $fromPct); |
| 3279 | $stops[] = new LinearEasingStop($output, $toPct); |
| 3280 | continue; |
| 3281 | } |
| 3282 | |
| 3283 | // Regular form: 1 or 2 parts (output, optional percentage). |
| 3284 | $inputPct = null; |
| 3285 | if (count($parts) === 2) { |
| 3286 | $pct = self::extractSinglePercentage(self::trimWhitespace($parts[1])); |
| 3287 | if ($pct === null) { |
| 3288 | return null; |
| 3289 | } |
| 3290 | $inputPct = $pct; |
| 3291 | } |
| 3292 | $stops[] = new LinearEasingStop($output, $inputPct); |
| 3293 | } |
| 3294 | if ($stops === []) { |
| 3295 | return null; |
| 3296 | } |
| 3297 | return new LinearEasing($stops); |
| 3298 | } |
| 3299 | |
| 3300 | /** |
| 3301 | * Extract a single percentage value from a token sequence |
| 3302 | * already trimmed of surrounding whitespace. |
| 3303 | * |
| 3304 | * @param list<Token> $tokens |
| 3305 | */ |
| 3306 | private static function extractSinglePercentage(array $tokens): ?float |
| 3307 | { |
| 3308 | if (count($tokens) !== 1) { |
| 3309 | return null; |
| 3310 | } |
| 3311 | $t = $tokens[0]; |
| 3312 | if (!($t instanceof PercentageToken)) { |
| 3313 | return null; |
| 3314 | } |
| 3315 | return (float) $t->value; |
| 3316 | } |
| 3317 | |
| 3318 | // ============================================================ |
| 3319 | // attr() — CSS Values 5 §11 |
| 3320 | // ============================================================ |
| 3321 | /** @param list<Token> $tokens */ |
| 3322 | private function parseAttrFunction(array $tokens): ?AttrFunction |
| 3323 | { |
| 3324 | $tokens = self::trimWhitespace($tokens); |
| 3325 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 3326 | if (count($commaGroups) < 1 || count($commaGroups) > 2) { |
| 3327 | return null; |
| 3328 | } |
| 3329 | $head = self::trimWhitespace($commaGroups[0]); |
| 3330 | if ($head === []) { |
| 3331 | return null; |
| 3332 | } |
| 3333 | if (!($head[0] instanceof IdentToken)) { |
| 3334 | return null; |
| 3335 | } |
| 3336 | $attributeName = $head[0]->value; |
| 3337 | $typeOrUnit = null; |
| 3338 | if (count($head) >= 2) { |
| 3339 | $rest = self::trimWhitespace(array_slice($head, 1)); |
| 3340 | if ($rest !== []) { |
| 3341 | // Type/unit hint — accept any single ident or |
| 3342 | // dimension unit; just serialise verbatim so the |
| 3343 | // cascade preserves the author's intent. |
| 3344 | $typeOrUnit = self::serializeTokens($rest); |
| 3345 | } |
| 3346 | } |
| 3347 | $fallback = null; |
| 3348 | if (count($commaGroups) === 2) { |
| 3349 | $fbCss = self::serializeTokens(self::trimWhitespace($commaGroups[1])); |
| 3350 | $fallback = $this->parseFromString($fbCss); |
| 3351 | } |
| 3352 | return new AttrFunction($attributeName, $typeOrUnit, $fallback); |
| 3353 | } |
| 3354 | |
| 3355 | // ============================================================ |
| 3356 | // env() — CSS Environment Variables 1 §3 |
| 3357 | // ============================================================ |
| 3358 | /** @param list<Token> $tokens */ |
| 3359 | private function parseEnvFunction(array $tokens): ?EnvFunction |
| 3360 | { |
| 3361 | $tokens = self::trimWhitespace($tokens); |
| 3362 | $commaGroups = self::splitTopLevel($tokens, CommaToken::class); |
| 3363 | if (count($commaGroups) < 1 || count($commaGroups) > 2) { |
| 3364 | return null; |
| 3365 | } |
| 3366 | $head = self::trimWhitespace($commaGroups[0]); |
| 3367 | if ($head === []) { |
| 3368 | return null; |
| 3369 | } |
| 3370 | if (!($head[0] instanceof IdentToken)) { |
| 3371 | return null; |
| 3372 | } |
| 3373 | $envName = $head[0]->value; |
| 3374 | $indices = []; |
| 3375 | $rest = array_slice($head, 1); |
| 3376 | foreach ($rest as $t) { |
| 3377 | if ($t instanceof WhitespaceToken) { |
| 3378 | continue; |
| 3379 | } |
| 3380 | if (!($t instanceof NumberToken)) { |
| 3381 | return null; |
| 3382 | } |
| 3383 | // Indices must be integers per CSS Env Vars 1 §3. |
| 3384 | if ($t->value !== floor($t->value)) { |
| 3385 | return null; |
| 3386 | } |
| 3387 | $indices[] = (int) $t->value; |
| 3388 | } |
| 3389 | $fallback = null; |
| 3390 | if (count($commaGroups) === 2) { |
| 3391 | $fbCss = self::serializeTokens(self::trimWhitespace($commaGroups[1])); |
| 3392 | $fallback = $this->parseFromString($fbCss); |
| 3393 | } |
| 3394 | return new EnvFunction($envName, $indices, $fallback); |
| 3395 | } |
| 3396 | |
| 3397 | // ============================================================ |
| 3398 | // target-counter / target-counters / target-text — GCPM 3 §3 |
| 3399 | // ============================================================ |
| 3400 | /** |
| 3401 | * Parse cross-reference functions used in paged-media TOCs: |
| 3402 | * |
| 3403 | * target-counter(<url-or-attr>, <counter>, <style>?) |
| 3404 | * target-counters(<url-or-attr>, <counter>, <string>, <style>?) |
| 3405 | * target-text(<url-or-attr>, [content | before | after | first-letter]?) |
| 3406 | * |
| 3407 | * Returns null on malformed input (caller falls back to the |
| 3408 | * generic function-token preservation path). |
| 3409 | * |
| 3410 | * @param list<Token> $tokens |
| 3411 | */ |
| 3412 | private function parseTargetFunction(string $name, array $tokens): ?TargetFunction |
| 3413 | { |
| 3414 | $kind = TargetFunctionKind::tryFrom(strtolower($name)); |
| 3415 | if ($kind === null) { |
| 3416 | return null; |
| 3417 | } |
| 3418 | $groups = self::splitTopLevel(self::trimWhitespace($tokens), CommaToken::class); |
| 3419 | if ($groups === []) { |
| 3420 | return null; |
| 3421 | } |
| 3422 | $target = $this->parseFromString(self::serializeTokens(self::trimWhitespace($groups[0]))); |
| 3423 | return match ($kind) { |
| 3424 | TargetFunctionKind::Counter => $this->buildTargetCounter($kind, $target, $groups), |
| 3425 | TargetFunctionKind::Counters => $this->buildTargetCounters($kind, $target, $groups), |
| 3426 | TargetFunctionKind::Text => $this->buildTargetText($kind, $target, $groups), |
| 3427 | }; |
| 3428 | } |
| 3429 | |
| 3430 | /** |
| 3431 | * @param list<list<Token>> $groups |
| 3432 | */ |
| 3433 | private function buildTargetCounter(TargetFunctionKind $kind, Value $target, array $groups): ?TargetFunction |
| 3434 | { |
| 3435 | if (count($groups) < 2 || count($groups) > 3) { |
| 3436 | return null; |
| 3437 | } |
| 3438 | $name = $this->parseCounterIdent($groups[1]); |
| 3439 | if ($name === null) { |
| 3440 | return null; |
| 3441 | } |
| 3442 | $style = null; |
| 3443 | if (count($groups) === 3) { |
| 3444 | $style = $this->parseCounterIdent($groups[2]); |
| 3445 | if ($style === null) { |
| 3446 | return null; |
| 3447 | } |
| 3448 | } |
| 3449 | return new TargetFunction($kind, $target, $name, null, $style); |
| 3450 | } |
| 3451 | |
| 3452 | /** |
| 3453 | * @param list<list<Token>> $groups |
| 3454 | */ |
| 3455 | private function buildTargetCounters(TargetFunctionKind $kind, Value $target, array $groups): ?TargetFunction |
| 3456 | { |
| 3457 | if (count($groups) < 3 || count($groups) > 4) { |
| 3458 | return null; |
| 3459 | } |
| 3460 | $name = $this->parseCounterIdent($groups[1]); |
| 3461 | if ($name === null) { |
| 3462 | return null; |
| 3463 | } |
| 3464 | $sepTokens = self::trimWhitespace($groups[2]); |
| 3465 | if (count($sepTokens) !== 1 || !($sepTokens[0] instanceof StringToken)) { |
| 3466 | return null; |
| 3467 | } |
| 3468 | $separator = new StringValue($sepTokens[0]->value); |
| 3469 | $style = null; |
| 3470 | if (count($groups) === 4) { |
| 3471 | $style = $this->parseCounterIdent($groups[3]); |
| 3472 | if ($style === null) { |
| 3473 | return null; |
| 3474 | } |
| 3475 | } |
| 3476 | return new TargetFunction($kind, $target, $name, $separator, $style); |
| 3477 | } |
| 3478 | |
| 3479 | /** |
| 3480 | * @param list<list<Token>> $groups |
| 3481 | */ |
| 3482 | private function buildTargetText(TargetFunctionKind $kind, Value $target, array $groups): ?TargetFunction |
| 3483 | { |
| 3484 | if (count($groups) < 1 || count($groups) > 2) { |
| 3485 | return null; |
| 3486 | } |
| 3487 | $source = null; |
| 3488 | if (count($groups) === 2) { |
| 3489 | $srcTokens = self::trimWhitespace($groups[1]); |
| 3490 | if (count($srcTokens) !== 1 || !($srcTokens[0] instanceof IdentToken)) { |
| 3491 | return null; |
| 3492 | } |
| 3493 | $kw = strtolower($srcTokens[0]->value); |
| 3494 | if (!in_array($kw, ['content', 'before', 'after', 'first-letter'], true)) { |
| 3495 | return null; |
| 3496 | } |
| 3497 | $source = new Keyword($kw); |
| 3498 | } |
| 3499 | return new TargetFunction($kind, $target, null, $source, null); |
| 3500 | } |
| 3501 | |
| 3502 | /** |
| 3503 | * @param list<Token> $group |
| 3504 | */ |
| 3505 | private function parseCounterIdent(array $group): ?Keyword |
| 3506 | { |
| 3507 | $trim = self::trimWhitespace($group); |
| 3508 | if (count($trim) !== 1 || !($trim[0] instanceof IdentToken)) { |
| 3509 | return null; |
| 3510 | } |
| 3511 | return new Keyword($trim[0]->value); |
| 3512 | } |
| 3513 | |
| 3514 | // ============================================================ |
| 3515 | // string() — CSS Generated Content for Paged Media 3 §5.2 |
| 3516 | // ============================================================ |
| 3517 | /** |
| 3518 | * Parse `string(<name> [, first | start | last | first-except]?)`. |
| 3519 | * The fetch-target keyword defaults to `first`. |
| 3520 | * |
| 3521 | * @param list<Token> $tokens |
| 3522 | */ |
| 3523 | private function parseStringFunction(array $tokens): ?StringFunction |
| 3524 | { |
| 3525 | $groups = self::splitTopLevel(self::trimWhitespace($tokens), CommaToken::class); |
| 3526 | if (count($groups) < 1 || count($groups) > 2) { |
| 3527 | return null; |
| 3528 | } |
| 3529 | $nameTokens = self::trimWhitespace($groups[0]); |
| 3530 | if (count($nameTokens) !== 1 || !($nameTokens[0] instanceof IdentToken)) { |
| 3531 | return null; |
| 3532 | } |
| 3533 | $name = $nameTokens[0]->value; |
| 3534 | $target = 'first'; |
| 3535 | if (count($groups) === 2) { |
| 3536 | $tgtTokens = self::trimWhitespace($groups[1]); |
| 3537 | if (count($tgtTokens) !== 1 || !($tgtTokens[0] instanceof IdentToken)) { |
| 3538 | return null; |
| 3539 | } |
| 3540 | $kw = strtolower($tgtTokens[0]->value); |
| 3541 | if (!in_array($kw, ['first', 'start', 'last', 'first-except'], true)) { |
| 3542 | return null; |
| 3543 | } |
| 3544 | $target = $kw; |
| 3545 | } |
| 3546 | return new StringFunction($name, $target); |
| 3547 | } |
| 3548 | |
| 3549 | // ============================================================ |
| 3550 | // view() / scroll() — CSS Scroll-driven Animations 1 §3.2/§4.2 |
| 3551 | // ============================================================ |
| 3552 | /** |
| 3553 | * Parse `view([<axis>?] [<inset>?])`. Axis is one of |
| 3554 | * `block | inline | x | y`; inset is one or two |
| 3555 | * <length-percentage> values. |
| 3556 | * |
| 3557 | * @param list<Token> $tokens |
| 3558 | */ |
| 3559 | private function parseViewTimeline(array $tokens): ?ViewTimeline |
| 3560 | { |
| 3561 | $trim = self::trimWhitespace($tokens); |
| 3562 | if ($trim === []) { |
| 3563 | return new ViewTimeline(); |
| 3564 | } |
| 3565 | $axisKw = ['block', 'inline', 'x', 'y']; |
| 3566 | $axis = null; |
| 3567 | $insetStart = null; |
| 3568 | $insetEnd = null; |
| 3569 | $insetCss = []; |
| 3570 | foreach (self::splitOnWhitespace($trim) as $part) { |
| 3571 | if ($axis === null && count($part) === 1 && $part[0] instanceof IdentToken |
| 3572 | && in_array(strtolower($part[0]->value), $axisKw, true) |
| 3573 | ) { |
| 3574 | $axis = strtolower($part[0]->value); |
| 3575 | continue; |
| 3576 | } |
| 3577 | // Anything else collects as a length/percentage inset. |
| 3578 | $value = $this->parseFromString(self::serializeTokens($part)); |
| 3579 | if (!($value instanceof Length) && !($value instanceof Percentage)) { |
| 3580 | return null; |
| 3581 | } |
| 3582 | if ($insetStart === null) { |
| 3583 | $insetStart = $value; |
| 3584 | } elseif ($insetEnd === null) { |
| 3585 | $insetEnd = $value; |
| 3586 | } else { |
| 3587 | return null; |
| 3588 | } |
| 3589 | } |
| 3590 | return new ViewTimeline($axis, $insetStart, $insetEnd); |
| 3591 | } |
| 3592 | |
| 3593 | /** |
| 3594 | * Parse `scroll([<scroller>?] [<axis>?])`. Scroller is |
| 3595 | * `nearest | root | self`; axis is `block | inline | x | y`. |
| 3596 | * |
| 3597 | * @param list<Token> $tokens |
| 3598 | */ |
| 3599 | private function parseScrollTimeline(array $tokens): ?ScrollTimeline |
| 3600 | { |
| 3601 | $trim = self::trimWhitespace($tokens); |
| 3602 | if ($trim === []) { |
| 3603 | return new ScrollTimeline(); |
| 3604 | } |
| 3605 | $scrollerKw = ['nearest', 'root', 'self']; |
| 3606 | $axisKw = ['block', 'inline', 'x', 'y']; |
| 3607 | $scroller = null; |
| 3608 | $axis = null; |
| 3609 | foreach (self::splitOnWhitespace($trim) as $part) { |
| 3610 | if (count($part) !== 1 || !($part[0] instanceof IdentToken)) { |
| 3611 | return null; |
| 3612 | } |
| 3613 | $lc = strtolower($part[0]->value); |
| 3614 | if ($scroller === null && in_array($lc, $scrollerKw, true)) { |
| 3615 | $scroller = $lc; |
| 3616 | continue; |
| 3617 | } |
| 3618 | if ($axis === null && in_array($lc, $axisKw, true)) { |
| 3619 | $axis = $lc; |
| 3620 | continue; |
| 3621 | } |
| 3622 | return null; |
| 3623 | } |
| 3624 | return new ScrollTimeline($scroller, $axis); |
| 3625 | } |
| 3626 | |
| 3627 | // ============================================================ |
| 3628 | // paint() — CSS Painting API Level 1 |
| 3629 | // ============================================================ |
| 3630 | /** |
| 3631 | * Parse `paint(<name> [, <arg>]*)`. The CSS Houdini paint |
| 3632 | * worklet is JS-side; for print rendering this is purely |
| 3633 | * declarative preservation — the cascade keeps the call shape |
| 3634 | * so external tooling can read it. |
| 3635 | * |
| 3636 | * @param list<Token> $tokens |
| 3637 | */ |
| 3638 | private function parsePaintFunction(array $tokens): ?PaintFunction |
| 3639 | { |
| 3640 | $groups = self::splitTopLevel(self::trimWhitespace($tokens), CommaToken::class); |
| 3641 | if ($groups === []) { |
| 3642 | return null; |
| 3643 | } |
| 3644 | $nameTokens = self::trimWhitespace($groups[0]); |
| 3645 | if (count($nameTokens) !== 1 || !($nameTokens[0] instanceof IdentToken)) { |
| 3646 | return null; |
| 3647 | } |
| 3648 | $name = $nameTokens[0]->value; |
| 3649 | $args = []; |
| 3650 | for ($i = 1; $i < count($groups); $i++) { |
| 3651 | $args[] = $this->parseFromString(self::serializeTokens(self::trimWhitespace($groups[$i]))); |
| 3652 | } |
| 3653 | return new PaintFunction($name, $args); |
| 3654 | } |
| 3655 | |
| 3656 | // ============================================================ |
| 3657 | // element() — CSS Generated Content for Paged Media 3 §4.2 |
| 3658 | // ============================================================ |
| 3659 | /** |
| 3660 | * Parse `element(<name> [, first | start | last | first-except]?)`. |
| 3661 | * Same grammar shape as `string()` per §4.2. |
| 3662 | * |
| 3663 | * @param list<Token> $tokens |
| 3664 | */ |
| 3665 | private function parseElementFunction(array $tokens): ?ElementFunction |
| 3666 | { |
| 3667 | $groups = self::splitTopLevel(self::trimWhitespace($tokens), CommaToken::class); |
| 3668 | if (count($groups) < 1 || count($groups) > 2) { |
| 3669 | return null; |
| 3670 | } |
| 3671 | $nameTokens = self::trimWhitespace($groups[0]); |
| 3672 | if (count($nameTokens) !== 1 || !($nameTokens[0] instanceof IdentToken)) { |
| 3673 | return null; |
| 3674 | } |
| 3675 | $name = $nameTokens[0]->value; |
| 3676 | $target = 'first'; |
| 3677 | if (count($groups) === 2) { |
| 3678 | $tgtTokens = self::trimWhitespace($groups[1]); |
| 3679 | if (count($tgtTokens) !== 1 || !($tgtTokens[0] instanceof IdentToken)) { |
| 3680 | return null; |
| 3681 | } |
| 3682 | $kw = strtolower($tgtTokens[0]->value); |
| 3683 | if (!in_array($kw, ['first', 'start', 'last', 'first-except'], true)) { |
| 3684 | return null; |
| 3685 | } |
| 3686 | $target = $kw; |
| 3687 | } |
| 3688 | return new ElementFunction($name, $target); |
| 3689 | } |
| 3690 | |
| 3691 | // ============================================================ |
| 3692 | // device-cmyk — CSS Color 5 §6 |
| 3693 | // ============================================================ |
| 3694 | /** |
| 3695 | * Parse `device-cmyk(<c> <m> <y> <k> [/ <alpha>]? [, <rgb-fallback>]?)`. |
| 3696 | * |
| 3697 | * Components accept percentages (0%..100%) or numbers (0..1); |
| 3698 | * both are normalised to the 0..1 storage range. Alpha |
| 3699 | * defaults to 1. Optional sRGB fallback is the second comma- |
| 3700 | * group (a color value the engine may use when CMYK isn't |
| 3701 | * applicable). |
| 3702 | * |
| 3703 | * @param list<Token> $tokens |
| 3704 | */ |
| 3705 | private function parseDeviceCmyk(array $tokens): ?DeviceCmyk |
| 3706 | { |
| 3707 | $groups = self::splitTopLevel(self::trimWhitespace($tokens), CommaToken::class); |
| 3708 | if (count($groups) < 1 || count($groups) > 2) { |
| 3709 | return null; |
| 3710 | } |
| 3711 | $main = self::trimWhitespace($groups[0]); |
| 3712 | // Split the main group on top-level `/` for alpha. The |
| 3713 | // components themselves are space-separated, so the slash |
| 3714 | // sits at depth-0. |
| 3715 | $slashGroups = self::splitOnSlash($main); |
| 3716 | if (count($slashGroups) < 1 || count($slashGroups) > 2) { |
| 3717 | return null; |
| 3718 | } |
| 3719 | $components = self::splitOnWhitespace(self::trimWhitespace($slashGroups[0])); |
| 3720 | if (count($components) !== 4) { |
| 3721 | return null; |
| 3722 | } |
| 3723 | $cmyk = []; |
| 3724 | foreach ($components as $group) { |
| 3725 | $val = $this->parseCmykComponent($group); |
| 3726 | if ($val === null) { |
| 3727 | return null; |
| 3728 | } |
| 3729 | $cmyk[] = $val; |
| 3730 | } |
| 3731 | $alpha = 1.0; |
| 3732 | if (count($slashGroups) === 2) { |
| 3733 | $alphaTokens = self::trimWhitespace($slashGroups[1]); |
| 3734 | if (count($alphaTokens) !== 1) { |
| 3735 | return null; |
| 3736 | } |
| 3737 | $a = $alphaTokens[0]; |
| 3738 | if ($a instanceof PercentageToken) { |
| 3739 | $alpha = max(0.0, min(1.0, (float) $a->value / 100.0)); |
| 3740 | } elseif ($a instanceof NumberToken) { |
| 3741 | $alpha = max(0.0, min(1.0, (float) $a->value)); |
| 3742 | } else { |
| 3743 | return null; |
| 3744 | } |
| 3745 | } |
| 3746 | $fallback = null; |
| 3747 | if (count($groups) === 2) { |
| 3748 | $f = $this->parseFromString(self::serializeTokens(self::trimWhitespace($groups[1]))); |
| 3749 | if (!$f instanceof Color) { |
| 3750 | return null; |
| 3751 | } |
| 3752 | $fallback = $f; |
| 3753 | } |
| 3754 | return new DeviceCmyk($cmyk[0], $cmyk[1], $cmyk[2], $cmyk[3], $alpha, $fallback); |
| 3755 | } |
| 3756 | |
| 3757 | /** |
| 3758 | * Parse a single CMYK component — accept percentage (0..100%) |
| 3759 | * or number (0..1). Returns the normalised 0..1 value or null |
| 3760 | * if the input isn't a single value token. |
| 3761 | * |
| 3762 | * @param list<Token> $tokens |
| 3763 | */ |
| 3764 | private function parseCmykComponent(array $tokens): ?float |
| 3765 | { |
| 3766 | $tokens = self::trimWhitespace($tokens); |
| 3767 | if (count($tokens) !== 1) { |
| 3768 | return null; |
| 3769 | } |
| 3770 | $t = $tokens[0]; |
| 3771 | if ($t instanceof PercentageToken) { |
| 3772 | return max(0.0, min(1.0, (float) $t->value / 100.0)); |
| 3773 | } |
| 3774 | if ($t instanceof NumberToken) { |
| 3775 | return max(0.0, min(1.0, (float) $t->value)); |
| 3776 | } |
| 3777 | return null; |
| 3778 | } |
| 3779 | |
| 3780 | // ============================================================ |
| 3781 | // contrast-color — CSS Color 7 §4 |
| 3782 | // ============================================================ |
| 3783 | /** |
| 3784 | * Parse `contrast-color(<color>)`. Stores the base color |
| 3785 | * verbatim; the renderer picks the higher-contrast UA color |
| 3786 | * (baseline: black vs white via relative luminance) at paint |
| 3787 | * time. |
| 3788 | * |
| 3789 | * @param list<Token> $tokens |
| 3790 | */ |
| 3791 | private function parseContrastColor(array $tokens): ?ContrastColor |
| 3792 | { |
| 3793 | $trim = self::trimWhitespace($tokens); |
| 3794 | if ($trim === []) { |
| 3795 | return null; |
| 3796 | } |
| 3797 | $base = $this->parseFromString(self::serializeTokens($trim)); |
| 3798 | return new ContrastColor($base); |
| 3799 | } |
| 3800 | |
| 3801 | // ============================================================ |
| 3802 | // cross-fade — CSS Images 4 §4 |
| 3803 | // ============================================================ |
| 3804 | /** |
| 3805 | * Parse `cross-fade(<entry> [, <entry>]*)` where each entry |
| 3806 | * is `[<percentage>]? <image>`. Percentages are 0..100; the |
| 3807 | * unlabeled entries share whatever weight remains after the |
| 3808 | * labeled entries. |
| 3809 | * |
| 3810 | * @param list<Token> $tokens |
| 3811 | */ |
| 3812 | private function parseCrossFade(array $tokens): ?CrossFade |
| 3813 | { |
| 3814 | $groups = self::splitTopLevel(self::trimWhitespace($tokens), CommaToken::class); |
| 3815 | if ($groups === []) { |
| 3816 | return null; |
| 3817 | } |
| 3818 | $options = []; |
| 3819 | foreach ($groups as $group) { |
| 3820 | $opt = $this->parseCrossFadeEntry(self::trimWhitespace($group)); |
| 3821 | if ($opt === null) { |
| 3822 | return null; |
| 3823 | } |
| 3824 | $options[] = $opt; |
| 3825 | } |
| 3826 | if (count($options) < 1) { |
| 3827 | return null; |
| 3828 | } |
| 3829 | return new CrossFade($options); |
| 3830 | } |
| 3831 | |
| 3832 | /** |
| 3833 | * @param list<Token> $tokens |
| 3834 | */ |
| 3835 | private function parseCrossFadeEntry(array $tokens): ?CrossFadeOption |
| 3836 | { |
| 3837 | if ($tokens === []) { |
| 3838 | return null; |
| 3839 | } |
| 3840 | $percent = null; |
| 3841 | $i = 0; |
| 3842 | // Optional leading percentage. |
| 3843 | if ($tokens[0] instanceof PercentageToken) { |
| 3844 | $percent = (float) $tokens[0]->value; |
| 3845 | if ($percent < 0.0 || $percent > 100.0) { |
| 3846 | return null; |
| 3847 | } |
| 3848 | $i = 1; |
| 3849 | // Eat trailing whitespace before the image. |
| 3850 | while ($i < count($tokens) && $tokens[$i] instanceof WhitespaceToken) { |
| 3851 | $i++; |
| 3852 | } |
| 3853 | } |
| 3854 | $rest = array_slice($tokens, $i); |
| 3855 | if ($rest === []) { |
| 3856 | return null; |
| 3857 | } |
| 3858 | $image = $this->parseFromString(self::serializeTokens($rest)); |
| 3859 | return new CrossFadeOption($image, $percent); |
| 3860 | } |
| 3861 | |
| 3862 | // ============================================================ |
| 3863 | // light-dark — CSS Color 5 §5 |
| 3864 | // ============================================================ |
| 3865 | /** |
| 3866 | * Parse `light-dark(<color>, <color>)`. The renderer selects |
| 3867 | * the active branch at paint time based on the resolved |
| 3868 | * `color-scheme` for the document / element. |
| 3869 | * |
| 3870 | * @param list<Token> $tokens |
| 3871 | */ |
| 3872 | private function parseLightDark(array $tokens): ?LightDark |
| 3873 | { |
| 3874 | $groups = self::splitTopLevel(self::trimWhitespace($tokens), CommaToken::class); |
| 3875 | if (count($groups) !== 2) { |
| 3876 | return null; |
| 3877 | } |
| 3878 | $light = $this->parseFromString(self::serializeTokens(self::trimWhitespace($groups[0]))); |
| 3879 | $dark = $this->parseFromString(self::serializeTokens(self::trimWhitespace($groups[1]))); |
| 3880 | return new LightDark($light, $dark); |
| 3881 | } |
| 3882 | |
| 3883 | // ============================================================ |
| 3884 | // image-set — CSS Images 4 §6 |
| 3885 | // ============================================================ |
| 3886 | /** |
| 3887 | * Parse `image-set(<option> [, <option>]*)` where each option |
| 3888 | * is `<image> [<resolution>]? [type(<mime>)]?`. Resolutions |
| 3889 | * accept the `x` / `dppx` / `dpcm` / `dpi` units; type() takes |
| 3890 | * a string-literal MIME. |
| 3891 | * |
| 3892 | * @param list<Token> $tokens |
| 3893 | */ |
| 3894 | private function parseImageSet(array $tokens): ?ImageSet |
| 3895 | { |
| 3896 | $tokens = self::trimWhitespace($tokens); |
| 3897 | if ($tokens === []) { |
| 3898 | return null; |
| 3899 | } |
| 3900 | $groups = self::splitTopLevel($tokens, CommaToken::class); |
| 3901 | $options = []; |
| 3902 | foreach ($groups as $group) { |
| 3903 | $opt = $this->parseImageSetOption(self::trimWhitespace($group)); |
| 3904 | if ($opt === null) { |
| 3905 | return null; |
| 3906 | } |
| 3907 | $options[] = $opt; |
| 3908 | } |
| 3909 | return new ImageSet($options); |
| 3910 | } |
| 3911 | |
| 3912 | /** |
| 3913 | * @param list<Token> $tokens |
| 3914 | */ |
| 3915 | private function parseImageSetOption(array $tokens): ?ImageSetOption |
| 3916 | { |
| 3917 | if ($tokens === []) { |
| 3918 | return null; |
| 3919 | } |
| 3920 | // First non-WS token may be either a URL function, a |
| 3921 | // string literal, or a nested image-* function (gradient |
| 3922 | // etc). For simplicity, treat the head as the "image" |
| 3923 | // until we hit a resolution token or a `type(` function. |
| 3924 | $image = null; |
| 3925 | $resolution = null; |
| 3926 | $mime = null; |
| 3927 | |
| 3928 | $i = 0; |
| 3929 | $count = count($tokens); |
| 3930 | while ($i < $count) { |
| 3931 | $t = $tokens[$i]; |
| 3932 | if ($t instanceof WhitespaceToken) { |
| 3933 | $i++; |
| 3934 | continue; |
| 3935 | } |
| 3936 | if ($t instanceof DimensionToken && self::isResolutionUnit($t->unit)) { |
| 3937 | $dppx = self::resolutionToDppx((float) $t->value, $t->unit); |
| 3938 | if ($dppx === null) { |
| 3939 | return null; |
| 3940 | } |
| 3941 | $resolution = $dppx; |
| 3942 | $i++; |
| 3943 | continue; |
| 3944 | } |
| 3945 | if ($t instanceof NumberToken && $image !== null) { |
| 3946 | // Bare numbers are NOT valid resolution per spec; |
| 3947 | // fail to parse. |
| 3948 | return null; |
| 3949 | } |
| 3950 | if ($t instanceof FunctionToken && strtolower($t->name) === 'type') { |
| 3951 | // Collect the matching close paren. |
| 3952 | $depth = 1; |
| 3953 | $argStart = $i + 1; |
| 3954 | $j = $argStart; |
| 3955 | while ($j < $count) { |
| 3956 | if ($tokens[$j] instanceof LeftParenToken || $tokens[$j] instanceof FunctionToken) { |
| 3957 | $depth++; |
| 3958 | } elseif ($tokens[$j] instanceof RightParenToken) { |
| 3959 | $depth--; |
| 3960 | if ($depth === 0) { |
| 3961 | break; |
| 3962 | } |
| 3963 | } |
| 3964 | $j++; |
| 3965 | } |
| 3966 | $inner = self::trimWhitespace(array_slice($tokens, $argStart, $j - $argStart)); |
| 3967 | if (count($inner) !== 1 || !($inner[0] instanceof StringToken)) { |
| 3968 | return null; |
| 3969 | } |
| 3970 | $mime = $inner[0]->value; |
| 3971 | $i = $j + 1; |
| 3972 | continue; |
| 3973 | } |
| 3974 | if ($image === null) { |
| 3975 | // Fast paths for the common cases — saves a |
| 3976 | // re-tokenise + re-parse round trip: |
| 3977 | // - UrlToken → Url value directly |
| 3978 | // - StringToken → StringValue directly |
| 3979 | if ($t instanceof UrlToken) { |
| 3980 | $image = new Url($t->value); |
| 3981 | $i++; |
| 3982 | continue; |
| 3983 | } |
| 3984 | if ($t instanceof StringToken) { |
| 3985 | $image = new \Phpdftk\Css\Value\StringValue($t->value); |
| 3986 | $i++; |
| 3987 | continue; |
| 3988 | } |
| 3989 | // Fallback: treat the token (and any function / |
| 3990 | // paren-balanced run starting here) as the image |
| 3991 | // and let the dispatch parse it. Used for nested |
| 3992 | // image-set / linear-gradient / etc. |
| 3993 | $consumed = self::collectFunctionLikeRun($tokens, $i); |
| 3994 | $imageTokens = array_slice($tokens, $i, $consumed); |
| 3995 | $css = self::serializeTokens($imageTokens); |
| 3996 | $image = $this->parseFromString($css); |
| 3997 | $i += $consumed; |
| 3998 | continue; |
| 3999 | } |
| 4000 | return null; |
| 4001 | } |
| 4002 | if ($image === null) { |
| 4003 | return null; |
| 4004 | } |
| 4005 | return new ImageSetOption($image, $resolution, $mime); |
| 4006 | } |
| 4007 | |
| 4008 | /** |
| 4009 | * Collect a function call (and any nested function calls in |
| 4010 | * its arguments) starting at $start, OR a single non-function |
| 4011 | * token. Returns the count of tokens consumed. |
| 4012 | * |
| 4013 | * @param list<Token> $tokens |
| 4014 | */ |
| 4015 | private static function collectFunctionLikeRun(array $tokens, int $start): int |
| 4016 | { |
| 4017 | $head = $tokens[$start] ?? null; |
| 4018 | if (!($head instanceof FunctionToken)) { |
| 4019 | return 1; |
| 4020 | } |
| 4021 | $depth = 1; |
| 4022 | $i = $start + 1; |
| 4023 | $count = count($tokens); |
| 4024 | while ($i < $count && $depth > 0) { |
| 4025 | if ($tokens[$i] instanceof LeftParenToken || $tokens[$i] instanceof FunctionToken) { |
| 4026 | $depth++; |
| 4027 | } elseif ($tokens[$i] instanceof RightParenToken) { |
| 4028 | $depth--; |
| 4029 | } |
| 4030 | $i++; |
| 4031 | } |
| 4032 | return $i - $start; |
| 4033 | } |
| 4034 | |
| 4035 | private static function isResolutionUnit(string $unit): bool |
| 4036 | { |
| 4037 | return in_array(strtolower($unit), ['x', 'dppx', 'dpcm', 'dpi'], true); |
| 4038 | } |
| 4039 | |
| 4040 | private static function resolutionToDppx(float $value, string $unit): ?float |
| 4041 | { |
| 4042 | return match (strtolower($unit)) { |
| 4043 | 'x', 'dppx' => $value, |
| 4044 | 'dpi' => $value / 96.0, // 96 dpi = 1 dppx |
| 4045 | 'dpcm' => $value * 2.54 / 96.0, // 1 dpcm = 2.54 dpi → /96 |
| 4046 | default => null, |
| 4047 | }; |
| 4048 | } |
| 4049 | |
| 4050 | /** @param list<Token> $tokens */ |
| 4051 | private function isRadialHeader(array $tokens): bool |
| 4052 | { |
| 4053 | foreach ($tokens as $t) { |
| 4054 | if ($t instanceof IdentToken |
| 4055 | && in_array(strtolower($t->value), ['circle', 'ellipse', 'at', 'closest-side', 'closest-corner', 'farthest-side', 'farthest-corner'], true) |
| 4056 | ) { |
| 4057 | return true; |
| 4058 | } |
| 4059 | } |
| 4060 | return false; |
| 4061 | } |
| 4062 | |
| 4063 | /** |
| 4064 | * @param list<Token> $tokens |
| 4065 | * @return array{0: GradientShape, 1: ?Length, 2: ?Length, 3: ?Length, 4: ?Length} |
| 4066 | */ |
| 4067 | private function parseRadialHeader(array $tokens): array |
| 4068 | { |
| 4069 | $shape = GradientShape::Ellipse; |
| 4070 | $sizeX = null; |
| 4071 | $sizeY = null; |
| 4072 | $centerX = null; |
| 4073 | $centerY = null; |
| 4074 | $atIdx = null; |
| 4075 | foreach ($tokens as $i => $t) { |
| 4076 | if ($t instanceof IdentToken && strtolower($t->value) === 'at') { |
| 4077 | $atIdx = $i; |
| 4078 | break; |
| 4079 | } |
| 4080 | } |
| 4081 | $headerPart = $atIdx !== null ? array_slice($tokens, 0, $atIdx) : $tokens; |
| 4082 | foreach (self::splitOnWhitespace($headerPart) as $piece) { |
| 4083 | $piece = self::trimWhitespace($piece); |
| 4084 | if ($piece === []) { |
| 4085 | continue; |
| 4086 | } |
| 4087 | $head = $piece[0]; |
| 4088 | if ($head instanceof IdentToken) { |
| 4089 | $name = strtolower($head->value); |
| 4090 | if ($name === 'circle') { |
| 4091 | $shape = GradientShape::Circle; |
| 4092 | } elseif ($name === 'ellipse') { |
| 4093 | $shape = GradientShape::Ellipse; |
| 4094 | } |
| 4095 | // closest-side etc. are sizing keywords; ignored for now. |
| 4096 | } elseif ($head instanceof DimensionToken) { |
| 4097 | $val = $this->parseSingle($piece); |
| 4098 | if ($val instanceof Length) { |
| 4099 | if ($sizeX === null) { |
| 4100 | $sizeX = $val; |
| 4101 | } else { |
| 4102 | $sizeY = $val; |
| 4103 | } |
| 4104 | } |
| 4105 | } |
| 4106 | } |
| 4107 | if ($atIdx !== null) { |
| 4108 | $positionPart = array_slice($tokens, $atIdx + 1); |
| 4109 | $positions = []; |
| 4110 | foreach (self::splitOnWhitespace($positionPart) as $piece) { |
| 4111 | $piece = self::trimWhitespace($piece); |
| 4112 | if ($piece === []) { |
| 4113 | continue; |
| 4114 | } |
| 4115 | $val = $this->parseSingle($piece); |
| 4116 | if ($val instanceof Length) { |
| 4117 | $positions[] = $val; |
| 4118 | } |
| 4119 | } |
| 4120 | $centerX = $positions[0] ?? null; |
| 4121 | $centerY = $positions[1] ?? null; |
| 4122 | } |
| 4123 | return [$shape, $sizeX, $sizeY, $centerX, $centerY]; |
| 4124 | } |
| 4125 | |
| 4126 | // ============================================================ |
| 4127 | // Token-stream utilities |
| 4128 | // ============================================================ |
| 4129 | |
| 4130 | /** @param list<Token> $tokens |
| 4131 | * @return list<Token> |
| 4132 | */ |
| 4133 | private static function trimWhitespace(array $tokens): array |
| 4134 | { |
| 4135 | $start = 0; |
| 4136 | $end = count($tokens) - 1; |
| 4137 | while ($start <= $end && ($tokens[$start] instanceof WhitespaceToken || $tokens[$start] instanceof EofToken)) { |
| 4138 | $start++; |
| 4139 | } |
| 4140 | while ($end >= $start && ($tokens[$end] instanceof WhitespaceToken || $tokens[$end] instanceof EofToken)) { |
| 4141 | $end--; |
| 4142 | } |
| 4143 | return array_slice($tokens, $start, $end - $start + 1); |
| 4144 | } |
| 4145 | |
| 4146 | /** |
| 4147 | * Split a flat token list at top-level instances of $separator (i.e. |
| 4148 | * outside any nested parens / brackets). |
| 4149 | * |
| 4150 | * @param list<Token> $tokens |
| 4151 | * @param class-string<Token> $separator |
| 4152 | * @return list<list<Token>> |
| 4153 | */ |
| 4154 | private static function splitTopLevel(array $tokens, string $separator): array |
| 4155 | { |
| 4156 | $groups = []; |
| 4157 | $current = []; |
| 4158 | $depth = 0; |
| 4159 | foreach ($tokens as $t) { |
| 4160 | $cls = $t::class; |
| 4161 | if ($depth === 0 && $cls === $separator) { |
| 4162 | $groups[] = $current; |
| 4163 | $current = []; |
| 4164 | continue; |
| 4165 | } |
| 4166 | if (str_ends_with($cls, '\\LeftParenToken') |
| 4167 | || str_ends_with($cls, '\\LeftBracketToken') |
| 4168 | || str_ends_with($cls, '\\LeftBraceToken') |
| 4169 | || $t instanceof FunctionToken |
| 4170 | ) { |
| 4171 | $depth++; |
| 4172 | } elseif (str_ends_with($cls, '\\RightParenToken') |
| 4173 | || str_ends_with($cls, '\\RightBracketToken') |
| 4174 | || str_ends_with($cls, '\\RightBraceToken') |
| 4175 | ) { |
| 4176 | if ($depth > 0) { |
| 4177 | $depth--; |
| 4178 | } |
| 4179 | } |
| 4180 | $current[] = $t; |
| 4181 | } |
| 4182 | $groups[] = $current; |
| 4183 | return $groups; |
| 4184 | } |
| 4185 | |
| 4186 | /** |
| 4187 | * Like {@see splitTopLevel} but splits on a specific `DelimToken` value |
| 4188 | * (typically `/` for the slash-shorthand pattern). |
| 4189 | * |
| 4190 | * @param list<Token> $tokens |
| 4191 | * @return list<list<Token>> |
| 4192 | */ |
| 4193 | private static function splitTopLevelDelim(array $tokens, string $delim): array |
| 4194 | { |
| 4195 | $groups = []; |
| 4196 | $current = []; |
| 4197 | $depth = 0; |
| 4198 | foreach ($tokens as $t) { |
| 4199 | if ($depth === 0 && $t instanceof DelimToken && $t->value === $delim) { |
| 4200 | $groups[] = $current; |
| 4201 | $current = []; |
| 4202 | continue; |
| 4203 | } |
| 4204 | if ($t instanceof LeftParenToken |
| 4205 | || $t instanceof LeftBracketToken |
| 4206 | || $t instanceof LeftBraceToken |
| 4207 | || $t instanceof FunctionToken |
| 4208 | ) { |
| 4209 | $depth++; |
| 4210 | } elseif ($t instanceof RightParenToken |
| 4211 | || $t instanceof RightBracketToken |
| 4212 | || $t instanceof RightBraceToken |
| 4213 | ) { |
| 4214 | if ($depth > 0) { |
| 4215 | $depth--; |
| 4216 | } |
| 4217 | } |
| 4218 | $current[] = $t; |
| 4219 | } |
| 4220 | $groups[] = $current; |
| 4221 | return $groups; |
| 4222 | } |
| 4223 | |
| 4224 | /** @param list<Token> $tokens |
| 4225 | * @return list<list<Token>> |
| 4226 | */ |
| 4227 | private static function splitOnWhitespace(array $tokens): array |
| 4228 | { |
| 4229 | $groups = []; |
| 4230 | $current = []; |
| 4231 | $depth = 0; |
| 4232 | foreach ($tokens as $t) { |
| 4233 | if ($depth === 0 && $t instanceof WhitespaceToken) { |
| 4234 | if ($current !== []) { |
| 4235 | $groups[] = $current; |
| 4236 | $current = []; |
| 4237 | } |
| 4238 | continue; |
| 4239 | } |
| 4240 | $cls = $t::class; |
| 4241 | if (str_ends_with($cls, '\\LeftParenToken') |
| 4242 | || str_ends_with($cls, '\\LeftBracketToken') |
| 4243 | || str_ends_with($cls, '\\LeftBraceToken') |
| 4244 | || $t instanceof FunctionToken |
| 4245 | ) { |
| 4246 | $depth++; |
| 4247 | } elseif (str_ends_with($cls, '\\RightParenToken') |
| 4248 | || str_ends_with($cls, '\\RightBracketToken') |
| 4249 | || str_ends_with($cls, '\\RightBraceToken') |
| 4250 | ) { |
| 4251 | if ($depth > 0) { |
| 4252 | $depth--; |
| 4253 | } |
| 4254 | } |
| 4255 | $current[] = $t; |
| 4256 | } |
| 4257 | if ($current !== []) { |
| 4258 | $groups[] = $current; |
| 4259 | } |
| 4260 | return $groups; |
| 4261 | } |
| 4262 | } |