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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Css\Cascade; |
| 6 | |
| 7 | use Phpdftk\Css\Value\Color; |
| 8 | use Phpdftk\Css\Value\CssFunction; |
| 9 | use Phpdftk\Css\Value\Integer; |
| 10 | use Phpdftk\Css\Value\ColorMix; |
| 11 | use Phpdftk\Css\Value\ColorSpace; |
| 12 | use Phpdftk\Css\Value\ContrastColor; |
| 13 | use Phpdftk\Css\Value\Keyword; |
| 14 | use Phpdftk\Css\Value\Length; |
| 15 | use Phpdftk\Css\Value\LightDark; |
| 16 | use Phpdftk\Css\Value\Number; |
| 17 | use Phpdftk\Css\Value\Percentage; |
| 18 | use Phpdftk\Css\Value\Url; |
| 19 | use Phpdftk\Css\Value\Value; |
| 20 | use Phpdftk\Css\Value\ValueList; |
| 21 | |
| 22 | /** |
| 23 | * Typed accessor surface over a per-element {@see CascadedValues} bag |
| 24 | * per `docs/plans/contracts.md` §1D.5. Each getter narrows the |
| 25 | * underlying `Value` to the type(s) the property's grammar permits; |
| 26 | * properties not explicitly set fall back to the registry's initial |
| 27 | * value (via `CascadedValues::get()`). |
| 28 | * |
| 29 | * The class is intentionally a thin wrapper — it adds no caching or |
| 30 | * computation of its own. The cascade resolves percentages, inherits |
| 31 | * values, and produces the initial-value fallbacks; ComputedStyle |
| 32 | * just exposes them with PHP-static-analysable signatures so |
| 33 | * downstream consumers (the box generator, painter, SVG renderer) |
| 34 | * don't have to type-check every `?Value` themselves. |
| 35 | * |
| 36 | * **Type narrowing fallback.** When a property's parsed value doesn't |
| 37 | * match its declared type (an invalid `font-weight: foo` slipping |
| 38 | * through), the getter returns the property's initial value instead |
| 39 | * of throwing — keeping the accessor surface infallible at the cost |
| 40 | * of swallowing parser errors that should have been caught earlier. |
| 41 | */ |
| 42 | final readonly class ComputedStyle |
| 43 | { |
| 44 | public function __construct(private CascadedValues $values) {} |
| 45 | |
| 46 | // ======================================================================== |
| 47 | // Generic access (escape hatches per contracts.md) |
| 48 | // ======================================================================== |
| 49 | |
| 50 | public function get(string $property): ?Value |
| 51 | { |
| 52 | return $this->values->get($property); |
| 53 | } |
| 54 | |
| 55 | public function has(string $property): bool |
| 56 | { |
| 57 | return $this->values->has($property); |
| 58 | } |
| 59 | |
| 60 | /** @return array<string, Value> */ |
| 61 | public function all(): array |
| 62 | { |
| 63 | return $this->values->all(); |
| 64 | } |
| 65 | |
| 66 | public function getCustomProperty(string $name): ?Value |
| 67 | { |
| 68 | $name = str_starts_with($name, '--') ? $name : '--' . $name; |
| 69 | return $this->values->get($name); |
| 70 | } |
| 71 | |
| 72 | public function getUnknown(string $name): ?Value |
| 73 | { |
| 74 | return $this->values->get($name); |
| 75 | } |
| 76 | |
| 77 | // ======================================================================== |
| 78 | // Color & background |
| 79 | // ======================================================================== |
| 80 | |
| 81 | public function getColor(): Color |
| 82 | { |
| 83 | return $this->expectColor('color', new Color(0.0, 0.0, 0.0, 1.0)); |
| 84 | } |
| 85 | |
| 86 | public function getBackgroundColor(): Color|Keyword |
| 87 | { |
| 88 | return $this->expectColorOrKeyword('background-color', 'transparent'); |
| 89 | } |
| 90 | |
| 91 | public function getBackgroundImage(): Value |
| 92 | { |
| 93 | return $this->values->get('background-image') ?? new Keyword('none'); |
| 94 | } |
| 95 | |
| 96 | public function getBackgroundRepeat(): Keyword |
| 97 | { |
| 98 | return $this->expectKeyword('background-repeat', 'repeat'); |
| 99 | } |
| 100 | |
| 101 | public function getBackgroundPosition(): Value |
| 102 | { |
| 103 | return $this->values->get('background-position') ?? new Keyword('0% 0%'); |
| 104 | } |
| 105 | |
| 106 | public function getBackgroundSize(): Value |
| 107 | { |
| 108 | return $this->values->get('background-size') ?? new Keyword('auto'); |
| 109 | } |
| 110 | |
| 111 | public function getBackgroundAttachment(): Keyword |
| 112 | { |
| 113 | return $this->expectKeyword('background-attachment', 'scroll'); |
| 114 | } |
| 115 | |
| 116 | public function getBackgroundOrigin(): Keyword |
| 117 | { |
| 118 | return $this->expectKeyword('background-origin', 'padding-box'); |
| 119 | } |
| 120 | |
| 121 | public function getBackgroundClip(): Keyword |
| 122 | { |
| 123 | return $this->expectKeyword('background-clip', 'border-box'); |
| 124 | } |
| 125 | |
| 126 | public function getOpacity(): Number |
| 127 | { |
| 128 | return $this->expectNumber('opacity', 1.0); |
| 129 | } |
| 130 | |
| 131 | // ======================================================================== |
| 132 | // Font & text |
| 133 | // ======================================================================== |
| 134 | |
| 135 | public function getFontFamily(): Value |
| 136 | { |
| 137 | return $this->values->get('font-family') ?? new Keyword('serif'); |
| 138 | } |
| 139 | |
| 140 | public function getFontSize(): Length |
| 141 | { |
| 142 | return $this->expectLength('font-size', 16.0); |
| 143 | } |
| 144 | |
| 145 | public function getFontStyle(): Keyword |
| 146 | { |
| 147 | return $this->expectKeyword('font-style', 'normal'); |
| 148 | } |
| 149 | |
| 150 | public function getFontWeight(): Integer|Keyword |
| 151 | { |
| 152 | $v = $this->values->get('font-weight'); |
| 153 | return $v instanceof Integer || $v instanceof Keyword ? $v : new Keyword('normal'); |
| 154 | } |
| 155 | |
| 156 | public function getLineHeight(): Length|Number|Keyword |
| 157 | { |
| 158 | $v = $this->values->get('line-height'); |
| 159 | return $v instanceof Length || $v instanceof Number || $v instanceof Keyword |
| 160 | ? $v |
| 161 | : new Keyword('normal'); |
| 162 | } |
| 163 | |
| 164 | public function getTextAlign(): Keyword |
| 165 | { |
| 166 | return $this->expectKeyword('text-align', 'start'); |
| 167 | } |
| 168 | |
| 169 | public function getTextAlignLast(): Keyword |
| 170 | { |
| 171 | return $this->expectKeyword('text-align-last', 'auto'); |
| 172 | } |
| 173 | |
| 174 | public function getTextDecorationLine(): Keyword |
| 175 | { |
| 176 | return $this->expectKeyword('text-decoration-line', 'none'); |
| 177 | } |
| 178 | |
| 179 | public function getTextDecorationStyle(): Keyword |
| 180 | { |
| 181 | return $this->expectKeyword('text-decoration-style', 'solid'); |
| 182 | } |
| 183 | |
| 184 | public function getTextDecorationColor(): Color |
| 185 | { |
| 186 | return $this->expectColor('text-decoration-color', new Color(0.0, 0.0, 0.0, 1.0)); |
| 187 | } |
| 188 | |
| 189 | public function getTextDecorationThickness(): Length|Keyword |
| 190 | { |
| 191 | return $this->expectLengthOrKeyword('text-decoration-thickness', 'auto'); |
| 192 | } |
| 193 | |
| 194 | public function getTextTransform(): Keyword |
| 195 | { |
| 196 | return $this->expectKeyword('text-transform', 'none'); |
| 197 | } |
| 198 | |
| 199 | public function getTextIndent(): Length |
| 200 | { |
| 201 | return $this->expectLength('text-indent', 0.0); |
| 202 | } |
| 203 | |
| 204 | public function getTextJustify(): Keyword |
| 205 | { |
| 206 | return $this->expectKeyword('text-justify', 'auto'); |
| 207 | } |
| 208 | |
| 209 | public function getLetterSpacing(): Length|Keyword |
| 210 | { |
| 211 | return $this->expectLengthOrKeyword('letter-spacing', 'normal'); |
| 212 | } |
| 213 | |
| 214 | public function getWordSpacing(): Length|Keyword |
| 215 | { |
| 216 | return $this->expectLengthOrKeyword('word-spacing', 'normal'); |
| 217 | } |
| 218 | |
| 219 | public function getWhiteSpace(): Keyword |
| 220 | { |
| 221 | return $this->expectKeyword('white-space', 'normal'); |
| 222 | } |
| 223 | |
| 224 | public function getWordBreak(): Keyword |
| 225 | { |
| 226 | return $this->expectKeyword('word-break', 'normal'); |
| 227 | } |
| 228 | |
| 229 | public function getOverflowWrap(): Keyword |
| 230 | { |
| 231 | return $this->expectKeyword('overflow-wrap', 'normal'); |
| 232 | } |
| 233 | |
| 234 | public function getVerticalAlign(): Length|Keyword |
| 235 | { |
| 236 | return $this->expectLengthOrKeyword('vertical-align', 'baseline'); |
| 237 | } |
| 238 | |
| 239 | public function getDirection(): Keyword |
| 240 | { |
| 241 | return $this->expectKeyword('direction', 'ltr'); |
| 242 | } |
| 243 | |
| 244 | public function getUnicodeBidi(): Keyword |
| 245 | { |
| 246 | return $this->expectKeyword('unicode-bidi', 'normal'); |
| 247 | } |
| 248 | |
| 249 | public function getTabSize(): Length|Integer |
| 250 | { |
| 251 | $v = $this->values->get('tab-size'); |
| 252 | return $v instanceof Length || $v instanceof Integer ? $v : new Integer(8); |
| 253 | } |
| 254 | |
| 255 | public function getQuotes(): Value |
| 256 | { |
| 257 | return $this->values->get('quotes') ?? new Keyword('auto'); |
| 258 | } |
| 259 | |
| 260 | // ======================================================================== |
| 261 | // Box model |
| 262 | // ======================================================================== |
| 263 | |
| 264 | public function getDisplay(): Keyword |
| 265 | { |
| 266 | return $this->expectKeyword('display', 'inline'); |
| 267 | } |
| 268 | |
| 269 | public function getPosition(): Keyword |
| 270 | { |
| 271 | return $this->expectKeyword('position', 'static'); |
| 272 | } |
| 273 | |
| 274 | public function getTop(): Length|Percentage|Keyword |
| 275 | { |
| 276 | return $this->expectLengthPercentageOrKeyword('top', 'auto'); |
| 277 | } |
| 278 | |
| 279 | public function getRight(): Length|Percentage|Keyword |
| 280 | { |
| 281 | return $this->expectLengthPercentageOrKeyword('right', 'auto'); |
| 282 | } |
| 283 | |
| 284 | public function getBottom(): Length|Percentage|Keyword |
| 285 | { |
| 286 | return $this->expectLengthPercentageOrKeyword('bottom', 'auto'); |
| 287 | } |
| 288 | |
| 289 | public function getLeft(): Length|Percentage|Keyword |
| 290 | { |
| 291 | return $this->expectLengthPercentageOrKeyword('left', 'auto'); |
| 292 | } |
| 293 | |
| 294 | public function getZIndex(): Integer|Keyword |
| 295 | { |
| 296 | $v = $this->values->get('z-index'); |
| 297 | return $v instanceof Integer || $v instanceof Keyword ? $v : new Keyword('auto'); |
| 298 | } |
| 299 | |
| 300 | public function getWidth(): Length|Percentage|Keyword |
| 301 | { |
| 302 | return $this->expectLengthPercentageOrKeyword('width', 'auto'); |
| 303 | } |
| 304 | |
| 305 | public function getHeight(): Length|Percentage|Keyword |
| 306 | { |
| 307 | return $this->expectLengthPercentageOrKeyword('height', 'auto'); |
| 308 | } |
| 309 | |
| 310 | public function getMinWidth(): Length|Percentage|Keyword |
| 311 | { |
| 312 | return $this->expectLengthPercentageOrKeyword('min-width', 'auto'); |
| 313 | } |
| 314 | |
| 315 | public function getMinHeight(): Length|Percentage|Keyword |
| 316 | { |
| 317 | return $this->expectLengthPercentageOrKeyword('min-height', 'auto'); |
| 318 | } |
| 319 | |
| 320 | public function getMaxWidth(): Length|Percentage|Keyword |
| 321 | { |
| 322 | return $this->expectLengthPercentageOrKeyword('max-width', 'none'); |
| 323 | } |
| 324 | |
| 325 | public function getMaxHeight(): Length|Percentage|Keyword |
| 326 | { |
| 327 | return $this->expectLengthPercentageOrKeyword('max-height', 'none'); |
| 328 | } |
| 329 | |
| 330 | public function getMarginTop(): Length|Percentage|Keyword |
| 331 | { |
| 332 | return $this->expectLengthPercentageOrKeyword('margin-top', 'auto'); |
| 333 | } |
| 334 | |
| 335 | public function getMarginRight(): Length|Percentage|Keyword |
| 336 | { |
| 337 | return $this->expectLengthPercentageOrKeyword('margin-right', 'auto'); |
| 338 | } |
| 339 | |
| 340 | public function getMarginBottom(): Length|Percentage|Keyword |
| 341 | { |
| 342 | return $this->expectLengthPercentageOrKeyword('margin-bottom', 'auto'); |
| 343 | } |
| 344 | |
| 345 | public function getMarginLeft(): Length|Percentage|Keyword |
| 346 | { |
| 347 | return $this->expectLengthPercentageOrKeyword('margin-left', 'auto'); |
| 348 | } |
| 349 | |
| 350 | public function getPaddingTop(): Length|Percentage |
| 351 | { |
| 352 | return $this->expectLengthOrPercentage('padding-top', 0.0); |
| 353 | } |
| 354 | |
| 355 | public function getPaddingRight(): Length|Percentage |
| 356 | { |
| 357 | return $this->expectLengthOrPercentage('padding-right', 0.0); |
| 358 | } |
| 359 | |
| 360 | public function getPaddingBottom(): Length|Percentage |
| 361 | { |
| 362 | return $this->expectLengthOrPercentage('padding-bottom', 0.0); |
| 363 | } |
| 364 | |
| 365 | public function getPaddingLeft(): Length|Percentage |
| 366 | { |
| 367 | return $this->expectLengthOrPercentage('padding-left', 0.0); |
| 368 | } |
| 369 | |
| 370 | public function getBorderTopWidth(): Length |
| 371 | { |
| 372 | return $this->expectBorderWidth('border-top-width'); |
| 373 | } |
| 374 | |
| 375 | public function getBorderRightWidth(): Length |
| 376 | { |
| 377 | return $this->expectBorderWidth('border-right-width'); |
| 378 | } |
| 379 | |
| 380 | public function getBorderBottomWidth(): Length |
| 381 | { |
| 382 | return $this->expectBorderWidth('border-bottom-width'); |
| 383 | } |
| 384 | |
| 385 | public function getBorderLeftWidth(): Length |
| 386 | { |
| 387 | return $this->expectBorderWidth('border-left-width'); |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * Resolve `border-*-width` cascaded values to Length per |
| 392 | * CSS Backgrounds 3 §4.4. Accepts the named keyword forms |
| 393 | * (`thin` = 1px, `medium` = 3px, `thick` = 5px) in addition |
| 394 | * to bare Length. |
| 395 | */ |
| 396 | private function expectBorderWidth(string $prop): Length |
| 397 | { |
| 398 | $v = $this->values->get($prop); |
| 399 | if ($v instanceof Length) { |
| 400 | return $v; |
| 401 | } |
| 402 | if ($v instanceof Keyword) { |
| 403 | $px = match (strtolower($v->name)) { |
| 404 | 'thin' => 1.0, |
| 405 | 'medium' => 3.0, |
| 406 | 'thick' => 5.0, |
| 407 | default => 0.0, |
| 408 | }; |
| 409 | return new Length($px, \Phpdftk\Css\Value\LengthUnit::Px); |
| 410 | } |
| 411 | return new Length(3.0, \Phpdftk\Css\Value\LengthUnit::Px); |
| 412 | } |
| 413 | |
| 414 | public function getBorderTopStyle(): Keyword |
| 415 | { |
| 416 | return $this->expectKeyword('border-top-style', 'none'); |
| 417 | } |
| 418 | |
| 419 | public function getBorderRightStyle(): Keyword |
| 420 | { |
| 421 | return $this->expectKeyword('border-right-style', 'none'); |
| 422 | } |
| 423 | |
| 424 | public function getBorderBottomStyle(): Keyword |
| 425 | { |
| 426 | return $this->expectKeyword('border-bottom-style', 'none'); |
| 427 | } |
| 428 | |
| 429 | public function getBorderLeftStyle(): Keyword |
| 430 | { |
| 431 | return $this->expectKeyword('border-left-style', 'none'); |
| 432 | } |
| 433 | |
| 434 | public function getBorderTopColor(): Color |
| 435 | { |
| 436 | return $this->expectColor('border-top-color', new Color(0.0, 0.0, 0.0, 1.0)); |
| 437 | } |
| 438 | |
| 439 | public function getBorderRightColor(): Color |
| 440 | { |
| 441 | return $this->expectColor('border-right-color', new Color(0.0, 0.0, 0.0, 1.0)); |
| 442 | } |
| 443 | |
| 444 | public function getBorderBottomColor(): Color |
| 445 | { |
| 446 | return $this->expectColor('border-bottom-color', new Color(0.0, 0.0, 0.0, 1.0)); |
| 447 | } |
| 448 | |
| 449 | public function getBorderLeftColor(): Color |
| 450 | { |
| 451 | return $this->expectColor('border-left-color', new Color(0.0, 0.0, 0.0, 1.0)); |
| 452 | } |
| 453 | |
| 454 | public function getBorderTopLeftRadius(): Value |
| 455 | { |
| 456 | return $this->values->get('border-top-left-radius') ?? new Length(0.0, \Phpdftk\Css\Value\LengthUnit::Px); |
| 457 | } |
| 458 | |
| 459 | public function getBorderTopRightRadius(): Value |
| 460 | { |
| 461 | return $this->values->get('border-top-right-radius') ?? new Length(0.0, \Phpdftk\Css\Value\LengthUnit::Px); |
| 462 | } |
| 463 | |
| 464 | public function getBorderBottomLeftRadius(): Value |
| 465 | { |
| 466 | return $this->values->get('border-bottom-left-radius') ?? new Length(0.0, \Phpdftk\Css\Value\LengthUnit::Px); |
| 467 | } |
| 468 | |
| 469 | public function getBorderBottomRightRadius(): Value |
| 470 | { |
| 471 | return $this->values->get('border-bottom-right-radius') ?? new Length(0.0, \Phpdftk\Css\Value\LengthUnit::Px); |
| 472 | } |
| 473 | |
| 474 | public function getBoxSizing(): Keyword |
| 475 | { |
| 476 | return $this->expectKeyword('box-sizing', 'content-box'); |
| 477 | } |
| 478 | |
| 479 | public function getBoxShadow(): Value |
| 480 | { |
| 481 | return $this->values->get('box-shadow') ?? new Keyword('none'); |
| 482 | } |
| 483 | |
| 484 | public function getOverflow(): Keyword |
| 485 | { |
| 486 | return $this->expectKeyword('overflow', 'visible'); |
| 487 | } |
| 488 | |
| 489 | public function getOverflowX(): Keyword |
| 490 | { |
| 491 | return $this->expectKeyword('overflow-x', 'visible'); |
| 492 | } |
| 493 | |
| 494 | public function getOverflowY(): Keyword |
| 495 | { |
| 496 | return $this->expectKeyword('overflow-y', 'visible'); |
| 497 | } |
| 498 | |
| 499 | public function getVisibility(): Keyword |
| 500 | { |
| 501 | return $this->expectKeyword('visibility', 'visible'); |
| 502 | } |
| 503 | |
| 504 | public function getOutlineWidth(): Length |
| 505 | { |
| 506 | return $this->expectLength('outline-width', 0.0); |
| 507 | } |
| 508 | |
| 509 | public function getOutlineStyle(): Keyword |
| 510 | { |
| 511 | return $this->expectKeyword('outline-style', 'none'); |
| 512 | } |
| 513 | |
| 514 | public function getOutlineColor(): Color |
| 515 | { |
| 516 | return $this->expectColor('outline-color', new Color(0.0, 0.0, 0.0, 1.0)); |
| 517 | } |
| 518 | |
| 519 | public function getOutlineOffset(): Length |
| 520 | { |
| 521 | return $this->expectLength('outline-offset', 0.0); |
| 522 | } |
| 523 | |
| 524 | public function getFloat(): Keyword |
| 525 | { |
| 526 | return $this->expectKeyword('float', 'none'); |
| 527 | } |
| 528 | |
| 529 | public function getClear(): Keyword |
| 530 | { |
| 531 | return $this->expectKeyword('clear', 'none'); |
| 532 | } |
| 533 | |
| 534 | public function getAspectRatio(): Value |
| 535 | { |
| 536 | return $this->values->get('aspect-ratio') ?? new Keyword('auto'); |
| 537 | } |
| 538 | |
| 539 | // ======================================================================== |
| 540 | // Flex |
| 541 | // ======================================================================== |
| 542 | |
| 543 | public function getFlexDirection(): Keyword |
| 544 | { |
| 545 | return $this->expectKeyword('flex-direction', 'row'); |
| 546 | } |
| 547 | |
| 548 | public function getFlexWrap(): Keyword |
| 549 | { |
| 550 | return $this->expectKeyword('flex-wrap', 'nowrap'); |
| 551 | } |
| 552 | |
| 553 | public function getJustifyContent(): Keyword |
| 554 | { |
| 555 | return $this->expectKeyword('justify-content', 'flex-start'); |
| 556 | } |
| 557 | |
| 558 | public function getAlignItems(): Keyword |
| 559 | { |
| 560 | return $this->expectKeyword('align-items', 'stretch'); |
| 561 | } |
| 562 | |
| 563 | public function getAlignContent(): Keyword |
| 564 | { |
| 565 | return $this->expectKeyword('align-content', 'stretch'); |
| 566 | } |
| 567 | |
| 568 | public function getAlignSelf(): Keyword |
| 569 | { |
| 570 | return $this->expectKeyword('align-self', 'auto'); |
| 571 | } |
| 572 | |
| 573 | public function getFlexGrow(): Number |
| 574 | { |
| 575 | return $this->expectNumber('flex-grow', 0.0); |
| 576 | } |
| 577 | |
| 578 | public function getFlexShrink(): Number |
| 579 | { |
| 580 | return $this->expectNumber('flex-shrink', 1.0); |
| 581 | } |
| 582 | |
| 583 | public function getFlexBasis(): Length|Percentage|Keyword |
| 584 | { |
| 585 | return $this->expectLengthPercentageOrKeyword('flex-basis', 'auto'); |
| 586 | } |
| 587 | |
| 588 | public function getOrder(): Integer |
| 589 | { |
| 590 | $v = $this->values->get('order'); |
| 591 | return $v instanceof Integer ? $v : new Integer(0); |
| 592 | } |
| 593 | |
| 594 | public function getRowGap(): Length|Keyword |
| 595 | { |
| 596 | return $this->expectLengthOrKeyword('row-gap', 'normal'); |
| 597 | } |
| 598 | |
| 599 | public function getColumnGap(): Length|Keyword |
| 600 | { |
| 601 | return $this->expectLengthOrKeyword('column-gap', 'normal'); |
| 602 | } |
| 603 | |
| 604 | // ======================================================================== |
| 605 | // Tables |
| 606 | // ======================================================================== |
| 607 | |
| 608 | public function getBorderCollapse(): Keyword |
| 609 | { |
| 610 | return $this->expectKeyword('border-collapse', 'separate'); |
| 611 | } |
| 612 | |
| 613 | public function getCaptionSide(): Keyword |
| 614 | { |
| 615 | return $this->expectKeyword('caption-side', 'top'); |
| 616 | } |
| 617 | |
| 618 | // ======================================================================== |
| 619 | // Lists |
| 620 | // ======================================================================== |
| 621 | |
| 622 | public function getListStyleType(): Keyword|CssFunction |
| 623 | { |
| 624 | $v = $this->values->get('list-style-type'); |
| 625 | return $v instanceof Keyword || $v instanceof CssFunction |
| 626 | ? $v |
| 627 | : new Keyword('disc'); |
| 628 | } |
| 629 | |
| 630 | public function getListStylePosition(): Keyword |
| 631 | { |
| 632 | return $this->expectKeyword('list-style-position', 'outside'); |
| 633 | } |
| 634 | |
| 635 | public function getListStyleImage(): Value |
| 636 | { |
| 637 | return $this->values->get('list-style-image') ?? new Keyword('none'); |
| 638 | } |
| 639 | |
| 640 | // ======================================================================== |
| 641 | // Paged media |
| 642 | // ======================================================================== |
| 643 | |
| 644 | public function getPage(): Keyword|CssFunction |
| 645 | { |
| 646 | $v = $this->values->get('page'); |
| 647 | return $v instanceof Keyword || $v instanceof CssFunction |
| 648 | ? $v |
| 649 | : new Keyword('auto'); |
| 650 | } |
| 651 | |
| 652 | public function getBreakBefore(): Keyword |
| 653 | { |
| 654 | return $this->expectKeyword('break-before', 'auto'); |
| 655 | } |
| 656 | |
| 657 | public function getBreakAfter(): Keyword |
| 658 | { |
| 659 | return $this->expectKeyword('break-after', 'auto'); |
| 660 | } |
| 661 | |
| 662 | public function getBreakInside(): Keyword |
| 663 | { |
| 664 | return $this->expectKeyword('break-inside', 'auto'); |
| 665 | } |
| 666 | |
| 667 | public function getBoxDecorationBreak(): Keyword |
| 668 | { |
| 669 | return $this->expectKeyword('box-decoration-break', 'slice'); |
| 670 | } |
| 671 | |
| 672 | public function getOrphans(): Integer |
| 673 | { |
| 674 | $v = $this->values->get('orphans'); |
| 675 | return $v instanceof Integer ? $v : new Integer(2); |
| 676 | } |
| 677 | |
| 678 | public function getWidows(): Integer |
| 679 | { |
| 680 | $v = $this->values->get('widows'); |
| 681 | return $v instanceof Integer ? $v : new Integer(2); |
| 682 | } |
| 683 | |
| 684 | // ======================================================================== |
| 685 | // Multi-column |
| 686 | // ======================================================================== |
| 687 | |
| 688 | public function getColumnCount(): Integer|Keyword |
| 689 | { |
| 690 | $v = $this->values->get('column-count'); |
| 691 | return $v instanceof Integer || $v instanceof Keyword ? $v : new Keyword('auto'); |
| 692 | } |
| 693 | |
| 694 | public function getColumnWidth(): Length|Keyword |
| 695 | { |
| 696 | return $this->expectLengthOrKeyword('column-width', 'auto'); |
| 697 | } |
| 698 | |
| 699 | public function getColumnRuleWidth(): Length |
| 700 | { |
| 701 | return $this->expectLength('column-rule-width', 0.0); |
| 702 | } |
| 703 | |
| 704 | public function getColumnRuleStyle(): Keyword |
| 705 | { |
| 706 | return $this->expectKeyword('column-rule-style', 'none'); |
| 707 | } |
| 708 | |
| 709 | public function getColumnRuleColor(): Color |
| 710 | { |
| 711 | return $this->expectColor('column-rule-color', new Color(0.0, 0.0, 0.0, 1.0)); |
| 712 | } |
| 713 | |
| 714 | public function getColumnSpan(): Keyword |
| 715 | { |
| 716 | return $this->expectKeyword('column-span', 'none'); |
| 717 | } |
| 718 | |
| 719 | public function getColumnFill(): Keyword |
| 720 | { |
| 721 | return $this->expectKeyword('column-fill', 'balance'); |
| 722 | } |
| 723 | |
| 724 | // ======================================================================== |
| 725 | // Effects |
| 726 | // ======================================================================== |
| 727 | |
| 728 | public function getTextShadow(): Value |
| 729 | { |
| 730 | return $this->values->get('text-shadow') ?? new Keyword('none'); |
| 731 | } |
| 732 | |
| 733 | public function getClipPath(): Value |
| 734 | { |
| 735 | return $this->values->get('clip-path') ?? new Keyword('none'); |
| 736 | } |
| 737 | |
| 738 | public function getFilter(): Value |
| 739 | { |
| 740 | return $this->values->get('filter') ?? new Keyword('none'); |
| 741 | } |
| 742 | |
| 743 | public function getTransform(): Value |
| 744 | { |
| 745 | return $this->values->get('transform') ?? new Keyword('none'); |
| 746 | } |
| 747 | |
| 748 | // ======================================================================== |
| 749 | // Type-narrowing helpers |
| 750 | // ======================================================================== |
| 751 | |
| 752 | private function expectKeyword(string $prop, string $fallback): Keyword |
| 753 | { |
| 754 | $v = $this->values->get($prop); |
| 755 | return $v instanceof Keyword ? $v : new Keyword($fallback); |
| 756 | } |
| 757 | |
| 758 | private function expectColor(string $prop, Color $fallback): Color |
| 759 | { |
| 760 | $v = $this->resolveColorChain($this->values->get($prop)); |
| 761 | return $v instanceof Color ? $v : $fallback; |
| 762 | } |
| 763 | |
| 764 | private function expectColorOrKeyword(string $prop, string $keywordFallback): Color|Keyword |
| 765 | { |
| 766 | $v = $this->resolveColorChain($this->values->get($prop)); |
| 767 | return $v instanceof Color || $v instanceof Keyword ? $v : new Keyword($keywordFallback); |
| 768 | } |
| 769 | |
| 770 | /** |
| 771 | * Walk the color-resolution chain. Each step lowers a typed |
| 772 | * higher-level color form into a concrete sRGB Color or passes |
| 773 | * through unchanged. Order: ColorMix → LightDark → ContrastColor. |
| 774 | */ |
| 775 | private function resolveColorChain(?Value $v): ?Value |
| 776 | { |
| 777 | return $this->resolveContrastColor( |
| 778 | $this->resolveLightDark( |
| 779 | $this->resolveColorMix($v), |
| 780 | ), |
| 781 | ); |
| 782 | } |
| 783 | |
| 784 | /** |
| 785 | * CSS Color 5 §3 — resolve `color-mix(in srgb, A p%, B q%)` to |
| 786 | * the linearly-interpolated sRGB Color. Other spaces (lab, lch, |
| 787 | * etc.) are passed through unchanged for now; full per-space |
| 788 | * mixing math lands with the color engine (Phase 4E). |
| 789 | */ |
| 790 | private function resolveColorMix(?Value $v): ?Value |
| 791 | { |
| 792 | if (!$v instanceof ColorMix) { |
| 793 | return $v; |
| 794 | } |
| 795 | // Only sRGB-space mixing is supported here; other spaces |
| 796 | // fall through to the renderer's color engine. |
| 797 | if ($v->space !== ColorSpace::sRGB && $v->space !== ColorSpace::sRGBLinear) { |
| 798 | return $v; |
| 799 | } |
| 800 | $total = $v->percentage1 + $v->percentage2; |
| 801 | if ($total <= 0.0) { |
| 802 | return $v; |
| 803 | } |
| 804 | $t = $v->percentage2 / $total; |
| 805 | $mix = static fn(float $a, float $b): float => $a * (1.0 - $t) + $b * $t; |
| 806 | $a = $v->color1; |
| 807 | $b = $v->color2; |
| 808 | $alpha = $mix($a->a, $b->a) * $v->alphaMultiplier; |
| 809 | return new Color( |
| 810 | $mix($a->r, $b->r), |
| 811 | $mix($a->g, $b->g), |
| 812 | $mix($a->b, $b->b), |
| 813 | max(0.0, min(1.0, $alpha)), |
| 814 | ); |
| 815 | } |
| 816 | |
| 817 | /** |
| 818 | * CSS Color 7 §4 — `contrast-color(<color>)`. Resolves to |
| 819 | * black or white based on which has higher contrast against |
| 820 | * the base color. Computes WCAG 2.x relative luminance and |
| 821 | * picks black for the lighter half, white for the darker. |
| 822 | * |
| 823 | * Non-Color base values (a keyword like `currentcolor`, |
| 824 | * a CssFunction the engine can't yet resolve) fall through — |
| 825 | * the renderer treats `contrast-color(currentcolor)` as |
| 826 | * "currentcolor" rather than throwing. |
| 827 | */ |
| 828 | private function resolveContrastColor(?Value $v): ?Value |
| 829 | { |
| 830 | if (!$v instanceof ContrastColor) { |
| 831 | return $v; |
| 832 | } |
| 833 | $base = $this->resolveLightDark($v->base); |
| 834 | if (!$base instanceof Color) { |
| 835 | return $base; |
| 836 | } |
| 837 | return self::relativeLuminance($base) > 0.5 |
| 838 | ? new Color(0.0, 0.0, 0.0, 1.0) |
| 839 | : new Color(1.0, 1.0, 1.0, 1.0); |
| 840 | } |
| 841 | |
| 842 | /** |
| 843 | * Compute WCAG 2.x relative luminance of an sRGB Color. |
| 844 | * Components linearised per the WCAG formula, then weighted |
| 845 | * 0.2126 R + 0.7152 G + 0.0722 B. |
| 846 | */ |
| 847 | private static function relativeLuminance(Color $c): float |
| 848 | { |
| 849 | $linear = static function (float $v): float { |
| 850 | return $v <= 0.03928 |
| 851 | ? $v / 12.92 |
| 852 | : (($v + 0.055) / 1.055) ** 2.4; |
| 853 | }; |
| 854 | return 0.2126 * $linear($c->r) |
| 855 | + 0.7152 * $linear($c->g) |
| 856 | + 0.0722 * $linear($c->b); |
| 857 | } |
| 858 | |
| 859 | /** |
| 860 | * CSS Color 5 §5 — pick the active branch of a `light-dark()` |
| 861 | * call at computed-value time based on the cascaded |
| 862 | * `color-scheme` property (CSS Color Adjustment 1 §2.2): |
| 863 | * |
| 864 | * - if `color-scheme` lists `dark` and does not list `light`, |
| 865 | * the document opts into the dark branch; |
| 866 | * - otherwise the light branch wins (the document default). |
| 867 | * |
| 868 | * The original {@see LightDark} value is preserved on the |
| 869 | * declaration so a future re-render under a different scheme |
| 870 | * is a value-level switch, not a re-cascade. |
| 871 | */ |
| 872 | private function resolveLightDark(?Value $v): ?Value |
| 873 | { |
| 874 | if (!$v instanceof LightDark) { |
| 875 | return $v; |
| 876 | } |
| 877 | return $this->prefersDarkScheme() ? $v->dark : $v->light; |
| 878 | } |
| 879 | |
| 880 | private function prefersDarkScheme(): bool |
| 881 | { |
| 882 | $scheme = $this->values->get('color-scheme'); |
| 883 | $hasLight = false; |
| 884 | $hasDark = false; |
| 885 | foreach ($this->extractSchemeIdents($scheme) as $ident) { |
| 886 | $lc = strtolower($ident); |
| 887 | if ($lc === 'light') { |
| 888 | $hasLight = true; |
| 889 | } elseif ($lc === 'dark') { |
| 890 | $hasDark = true; |
| 891 | } |
| 892 | } |
| 893 | return $hasDark && !$hasLight; |
| 894 | } |
| 895 | |
| 896 | /** |
| 897 | * @return list<string> |
| 898 | */ |
| 899 | private function extractSchemeIdents(?Value $value): array |
| 900 | { |
| 901 | if ($value instanceof Keyword) { |
| 902 | return [$value->name]; |
| 903 | } |
| 904 | if ($value instanceof ValueList) { |
| 905 | $out = []; |
| 906 | foreach ($value->values as $v) { |
| 907 | if ($v instanceof Keyword) { |
| 908 | $out[] = $v->name; |
| 909 | } |
| 910 | } |
| 911 | return $out; |
| 912 | } |
| 913 | return []; |
| 914 | } |
| 915 | |
| 916 | private function expectLength(string $prop, float $fallbackPx): Length |
| 917 | { |
| 918 | $v = $this->values->get($prop); |
| 919 | return $v instanceof Length ? $v : new Length($fallbackPx, \Phpdftk\Css\Value\LengthUnit::Px); |
| 920 | } |
| 921 | |
| 922 | private function expectLengthOrKeyword(string $prop, string $keywordFallback): Length|Keyword |
| 923 | { |
| 924 | $v = $this->values->get($prop); |
| 925 | return $v instanceof Length || $v instanceof Keyword ? $v : new Keyword($keywordFallback); |
| 926 | } |
| 927 | |
| 928 | private function expectLengthOrPercentage(string $prop, float $fallbackPx): Length|Percentage |
| 929 | { |
| 930 | $v = $this->values->get($prop); |
| 931 | return $v instanceof Length || $v instanceof Percentage |
| 932 | ? $v |
| 933 | : new Length($fallbackPx, \Phpdftk\Css\Value\LengthUnit::Px); |
| 934 | } |
| 935 | |
| 936 | private function expectLengthPercentageOrKeyword(string $prop, string $keywordFallback): Length|Percentage|Keyword |
| 937 | { |
| 938 | $v = $this->values->get($prop); |
| 939 | return $v instanceof Length || $v instanceof Percentage || $v instanceof Keyword |
| 940 | ? $v |
| 941 | : new Keyword($keywordFallback); |
| 942 | } |
| 943 | |
| 944 | private function expectNumber(string $prop, float $fallback): Number |
| 945 | { |
| 946 | $v = $this->values->get($prop); |
| 947 | return $v instanceof Number ? $v : new Number($fallback); |
| 948 | } |
| 949 | } |