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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg; |
| 6 | |
| 7 | use Phpdftk\Svg\Value\Paint; |
| 8 | use Phpdftk\Svg\Value\Transform; |
| 9 | |
| 10 | /** |
| 11 | * An SVG element with a tag name, attributes, and a child list. Concrete |
| 12 | * subclasses (`Shape\Rect`, `Group`, `SvgDocument`, …) add typed accessors |
| 13 | * over the raw attribute strings stored here, so callers never have to |
| 14 | * remember whether `cx` is a length or a number. |
| 15 | * |
| 16 | * Attribute names are case-sensitive per the SVG spec — `viewBox` and |
| 17 | * `clipPathUnits` etc. keep their camelCase. The parser passes them |
| 18 | * through verbatim. |
| 19 | */ |
| 20 | abstract class Element extends Node |
| 21 | { |
| 22 | /** @var array<string, string> */ |
| 23 | public array $attributes = []; |
| 24 | |
| 25 | /** @var list<Node> */ |
| 26 | public array $children = []; |
| 27 | |
| 28 | public function __construct(public readonly string $localName) {} |
| 29 | |
| 30 | public function getAttribute(string $name): ?string |
| 31 | { |
| 32 | return $this->attributes[$name] ?? null; |
| 33 | } |
| 34 | |
| 35 | public function hasAttribute(string $name): bool |
| 36 | { |
| 37 | return isset($this->attributes[$name]); |
| 38 | } |
| 39 | |
| 40 | public function setAttribute(string $name, string $value): void |
| 41 | { |
| 42 | $this->attributes[$name] = $value; |
| 43 | } |
| 44 | |
| 45 | public function appendChild(Node $node): void |
| 46 | { |
| 47 | $node->parent = $this; |
| 48 | $this->children[] = $node; |
| 49 | } |
| 50 | |
| 51 | /** @return list<Element> elements with the given local name in document order. */ |
| 52 | public function findByTag(string $localName): array |
| 53 | { |
| 54 | $out = []; |
| 55 | foreach ($this->children as $child) { |
| 56 | if ($child instanceof Element) { |
| 57 | if ($child->localName === $localName) { |
| 58 | $out[] = $child; |
| 59 | } |
| 60 | foreach ($child->findByTag($localName) as $nested) { |
| 61 | $out[] = $nested; |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 | return $out; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Read an SVG length attribute as a float, falling back to 0 when the |
| 70 | * attribute is absent OR doesn't start with a parseable number — per |
| 71 | * SVG 2's "invalid value → initial value" rule for `<length>`. Unit |
| 72 | * suffixes (`px`, `pt`, `mm`, `%`, …) are tolerated and ignored. |
| 73 | */ |
| 74 | protected function parseLengthOrZero(string $attr): float |
| 75 | { |
| 76 | $raw = $this->attributes[$attr] ?? null; |
| 77 | if ($raw === null) { |
| 78 | return 0.0; |
| 79 | } |
| 80 | if (preg_match('/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)/', $raw, $m) !== 1) { |
| 81 | return 0.0; |
| 82 | } |
| 83 | return (float) $m[1]; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Parse the `transform` attribute per SVG 2 §8.4. Returns null when the |
| 88 | * attribute is absent, empty, or malformed — SVG 2's "invalid → |
| 89 | * ignored" semantics. Callers that want a hard error should call |
| 90 | * `Transform::parse()` directly. |
| 91 | */ |
| 92 | public function transform(): ?Transform |
| 93 | { |
| 94 | $raw = $this->attributes['transform'] ?? null; |
| 95 | if ($raw === null || trim($raw) === '') { |
| 96 | return null; |
| 97 | } |
| 98 | try { |
| 99 | return Transform::parse($raw); |
| 100 | } catch (\InvalidArgumentException) { |
| 101 | return null; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Class names from the `class` attribute, whitespace-separated per |
| 107 | * HTML / CSS conventions. Empty list when absent or empty. |
| 108 | * |
| 109 | * @return list<string> |
| 110 | */ |
| 111 | public function classList(): array |
| 112 | { |
| 113 | $raw = $this->attributes['class'] ?? null; |
| 114 | if ($raw === null || trim($raw) === '') { |
| 115 | return []; |
| 116 | } |
| 117 | $parts = preg_split('/\s+/', trim($raw)) ?: []; |
| 118 | return array_values(array_filter($parts, static fn(string $c): bool => $c !== '')); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Raw `style=""` attribute text, or null if absent. Parsing into |
| 123 | * typed declarations happens in `Css\CssBridge`; sanitiser callers |
| 124 | * can read the raw text without pulling in the CSS dependency. |
| 125 | */ |
| 126 | public function inlineStyleText(): ?string |
| 127 | { |
| 128 | $raw = $this->attributes['style'] ?? null; |
| 129 | if ($raw === null) { |
| 130 | return null; |
| 131 | } |
| 132 | return trim($raw) === '' ? null : $raw; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * `fill` presentation attribute per SVG 2 §13.2. Null when absent or |
| 137 | * malformed; the painter then applies inherited or initial values. |
| 138 | */ |
| 139 | public function fill(): ?Paint |
| 140 | { |
| 141 | return $this->parsePaint('fill'); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * `stroke` presentation attribute per SVG 2 §13.2. Default is `none` |
| 146 | * per spec; absent here returns null so the painter can distinguish |
| 147 | * "not set on this element" from "explicitly none". |
| 148 | */ |
| 149 | public function stroke(): ?Paint |
| 150 | { |
| 151 | return $this->parsePaint('stroke'); |
| 152 | } |
| 153 | |
| 154 | /** `fill-opacity` — clamped to [0, 1] per SVG 2 §13.2. */ |
| 155 | public function fillOpacity(): ?float |
| 156 | { |
| 157 | return $this->parseClampedFraction('fill-opacity'); |
| 158 | } |
| 159 | |
| 160 | /** `stroke-opacity` — clamped to [0, 1]. */ |
| 161 | public function strokeOpacity(): ?float |
| 162 | { |
| 163 | return $this->parseClampedFraction('stroke-opacity'); |
| 164 | } |
| 165 | |
| 166 | /** Group `opacity` — clamped to [0, 1]. */ |
| 167 | public function opacity(): ?float |
| 168 | { |
| 169 | return $this->parseClampedFraction('opacity'); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * `fill-rule` — one of `nonzero` or `evenodd`. Returns null for absent |
| 174 | * or unrecognised values so the painter applies the initial value |
| 175 | * (`nonzero`) rather than guessing. |
| 176 | */ |
| 177 | public function fillRule(): ?string |
| 178 | { |
| 179 | $raw = $this->presentationOrStyle('fill-rule'); |
| 180 | if ($raw === null) { |
| 181 | return null; |
| 182 | } |
| 183 | $value = strtolower(trim($raw)); |
| 184 | return match ($value) { |
| 185 | 'nonzero', 'evenodd' => $value, |
| 186 | default => null, |
| 187 | }; |
| 188 | } |
| 189 | |
| 190 | /** `stroke-width` — non-negative length, default `1`. Negative → null. */ |
| 191 | public function strokeWidth(): ?float |
| 192 | { |
| 193 | $raw = $this->presentationOrStyle('stroke-width'); |
| 194 | if ($raw === null) { |
| 195 | return null; |
| 196 | } |
| 197 | $value = $this->parseNumberPrefix($raw); |
| 198 | if ($value === null || $value < 0.0) { |
| 199 | return null; |
| 200 | } |
| 201 | return $value; |
| 202 | } |
| 203 | |
| 204 | /** `stroke-linecap` — one of `butt`, `round`, `square`. */ |
| 205 | public function strokeLinecap(): ?string |
| 206 | { |
| 207 | $raw = $this->presentationOrStyle('stroke-linecap'); |
| 208 | if ($raw === null) { |
| 209 | return null; |
| 210 | } |
| 211 | $value = strtolower(trim($raw)); |
| 212 | return match ($value) { |
| 213 | 'butt', 'round', 'square' => $value, |
| 214 | default => null, |
| 215 | }; |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * `stroke-linejoin` — `miter`, `round`, `bevel`, plus SVG 2's |
| 220 | * `miter-clip` and `arcs`. |
| 221 | */ |
| 222 | public function strokeLinejoin(): ?string |
| 223 | { |
| 224 | $raw = $this->presentationOrStyle('stroke-linejoin'); |
| 225 | if ($raw === null) { |
| 226 | return null; |
| 227 | } |
| 228 | $value = strtolower(trim($raw)); |
| 229 | return match ($value) { |
| 230 | 'miter', 'round', 'bevel', 'miter-clip', 'arcs' => $value, |
| 231 | default => null, |
| 232 | }; |
| 233 | } |
| 234 | |
| 235 | /** `stroke-miterlimit` — must be ≥ 1 per SVG 2 §13.4; otherwise null. */ |
| 236 | public function strokeMiterlimit(): ?float |
| 237 | { |
| 238 | $raw = $this->presentationOrStyle('stroke-miterlimit'); |
| 239 | if ($raw === null) { |
| 240 | return null; |
| 241 | } |
| 242 | $value = $this->parseNumberPrefix($raw); |
| 243 | if ($value === null || $value < 1.0) { |
| 244 | return null; |
| 245 | } |
| 246 | return $value; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * `stroke-dasharray` — `none` or a list of lengths. Returns an empty |
| 251 | * list for both null and `none` so the painter has a single |
| 252 | * "no dashes" branch. |
| 253 | * |
| 254 | * @return list<float> |
| 255 | */ |
| 256 | public function strokeDasharray(): array |
| 257 | { |
| 258 | $raw = $this->presentationOrStyle('stroke-dasharray'); |
| 259 | if ($raw === null) { |
| 260 | return []; |
| 261 | } |
| 262 | $trimmed = trim($raw); |
| 263 | if ($trimmed === '' || strcasecmp($trimmed, 'none') === 0) { |
| 264 | return []; |
| 265 | } |
| 266 | if (preg_match_all('/[+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?/', $trimmed, $m) === false) { |
| 267 | return []; |
| 268 | } |
| 269 | $out = []; |
| 270 | foreach ($m[0] as $token) { |
| 271 | $n = (float) $token; |
| 272 | if ($n < 0.0) { |
| 273 | // SVG 2 §13.4: a single negative value invalidates the |
| 274 | // entire list. Painter falls back to no dashes. |
| 275 | return []; |
| 276 | } |
| 277 | $out[] = $n; |
| 278 | } |
| 279 | return $out; |
| 280 | } |
| 281 | |
| 282 | /** `stroke-dashoffset` — any number; default `0`. */ |
| 283 | public function strokeDashoffset(): ?float |
| 284 | { |
| 285 | $raw = $this->presentationOrStyle('stroke-dashoffset'); |
| 286 | if ($raw === null) { |
| 287 | return null; |
| 288 | } |
| 289 | return $this->parseNumberPrefix($raw); |
| 290 | } |
| 291 | |
| 292 | /** |
| 293 | * `font-family` — CSS Fonts 4 §3.2. A comma-separated prioritised list |
| 294 | * of family names; each entry is trimmed and surrounding single or |
| 295 | * double quotes are stripped (CSS reserves quotes for names containing |
| 296 | * whitespace or reserved words). An absent attribute → empty list, so |
| 297 | * the painter applies the inherited or default stack. |
| 298 | * |
| 299 | * @return list<string> |
| 300 | */ |
| 301 | public function fontFamily(): array |
| 302 | { |
| 303 | $raw = $this->presentationOrStyle('font-family'); |
| 304 | if ($raw === null || trim($raw) === '') { |
| 305 | return []; |
| 306 | } |
| 307 | $parts = explode(',', $raw); |
| 308 | $out = []; |
| 309 | foreach ($parts as $part) { |
| 310 | $name = trim($part); |
| 311 | if ($name === '') { |
| 312 | continue; |
| 313 | } |
| 314 | if (strlen($name) >= 2) { |
| 315 | $first = $name[0]; |
| 316 | $last = $name[strlen($name) - 1]; |
| 317 | if (($first === '"' && $last === '"') || ($first === "'" && $last === "'")) { |
| 318 | $name = substr($name, 1, -1); |
| 319 | } |
| 320 | } |
| 321 | if ($name !== '') { |
| 322 | $out[] = $name; |
| 323 | } |
| 324 | } |
| 325 | return $out; |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * `font-size` — CSS Fonts 4 §3.5. Length value; absolute keywords |
| 330 | * (`small`, `large`, …) and percentages are deferred to the cascade |
| 331 | * work in 3J. |
| 332 | */ |
| 333 | public function fontSize(): ?float |
| 334 | { |
| 335 | $raw = $this->presentationOrStyle('font-size'); |
| 336 | if ($raw === null) { |
| 337 | return null; |
| 338 | } |
| 339 | $value = $this->parseNumberPrefix($raw); |
| 340 | if ($value === null || $value < 0.0) { |
| 341 | return null; |
| 342 | } |
| 343 | return $value; |
| 344 | } |
| 345 | |
| 346 | /** |
| 347 | * `font-weight` — returned as a raw string (`normal`, `bold`, |
| 348 | * `bolder`, `lighter`, or a numeric weight like `400`). The painter |
| 349 | * normalises to the OpenType weight axis; the parser stays neutral. |
| 350 | */ |
| 351 | public function fontWeight(): ?string |
| 352 | { |
| 353 | $raw = $this->presentationOrStyle('font-weight'); |
| 354 | if ($raw === null) { |
| 355 | return null; |
| 356 | } |
| 357 | $value = trim($raw); |
| 358 | return $value === '' ? null : $value; |
| 359 | } |
| 360 | |
| 361 | /** |
| 362 | * `font-style` — `normal`, `italic`, or `oblique`. Returns null for |
| 363 | * absent and unrecognised values so the painter applies the inherited |
| 364 | * or initial style. |
| 365 | */ |
| 366 | public function fontStyle(): ?string |
| 367 | { |
| 368 | $raw = $this->presentationOrStyle('font-style'); |
| 369 | if ($raw === null) { |
| 370 | return null; |
| 371 | } |
| 372 | $value = strtolower(trim($raw)); |
| 373 | return match ($value) { |
| 374 | 'normal', 'italic', 'oblique' => $value, |
| 375 | default => null, |
| 376 | }; |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * `text-shadow` per CSS Text Decoration 4 §6 — a raw, trimmed CSS |
| 381 | * value string. Returns null for absent, empty, or `none`. The |
| 382 | * painter is responsible for parsing the comma-separated layer |
| 383 | * list (`<offset-x> <offset-y> [<blur-radius>] [<color>]`); we |
| 384 | * keep the parser at the painter level because that's where the |
| 385 | * Color / Length consumers live. |
| 386 | */ |
| 387 | public function textShadow(): ?string |
| 388 | { |
| 389 | $raw = $this->presentationOrStyle('text-shadow'); |
| 390 | if ($raw === null) { |
| 391 | return null; |
| 392 | } |
| 393 | $value = trim($raw); |
| 394 | if ($value === '' || strcasecmp($value, 'none') === 0) { |
| 395 | return null; |
| 396 | } |
| 397 | return $value; |
| 398 | } |
| 399 | |
| 400 | private function parsePaint(string $attr): ?Paint |
| 401 | { |
| 402 | $raw = $this->presentationOrStyle($attr); |
| 403 | if ($raw === null) { |
| 404 | return null; |
| 405 | } |
| 406 | return Paint::parse($raw); |
| 407 | } |
| 408 | |
| 409 | private function parseClampedFraction(string $attr): ?float |
| 410 | { |
| 411 | $raw = $this->presentationOrStyle($attr); |
| 412 | if ($raw === null) { |
| 413 | return null; |
| 414 | } |
| 415 | $value = $this->parseNumberPrefix($raw); |
| 416 | if ($value === null) { |
| 417 | return null; |
| 418 | } |
| 419 | return max(0.0, min(1.0, $value)); |
| 420 | } |
| 421 | |
| 422 | /** |
| 423 | * Resolve a presentation attribute value, falling back to the |
| 424 | * `style` attribute's CSS declaration of the same property when |
| 425 | * the presentation form is absent. SVG 2 §6.1 defines this |
| 426 | * equivalence: `fill="green"` and `style="fill: green"` are |
| 427 | * interchangeable. The wpt-harness DOM settler projects |
| 428 | * computed CSS values into inline `style` so external rules |
| 429 | * reach this hook too. |
| 430 | * |
| 431 | * Block comments (the settler emits a `/* phpdftk-settle-dom *\/` |
| 432 | * marker) are stripped before tokenising so the prefix doesn't |
| 433 | * fool the property-name match. |
| 434 | */ |
| 435 | protected function presentationOrStyle(string $property): ?string |
| 436 | { |
| 437 | $raw = $this->attributes[$property] ?? null; |
| 438 | if ($raw !== null) { |
| 439 | return $raw; |
| 440 | } |
| 441 | $style = $this->attributes['style'] ?? null; |
| 442 | if ($style === null) { |
| 443 | return null; |
| 444 | } |
| 445 | $cleaned = preg_replace('/\/\*.*?\*\//s', ' ', $style) ?? $style; |
| 446 | $target = strtolower($property); |
| 447 | foreach (explode(';', $cleaned) as $decl) { |
| 448 | $colon = strpos($decl, ':'); |
| 449 | if ($colon === false) { |
| 450 | continue; |
| 451 | } |
| 452 | $name = strtolower(trim(substr($decl, 0, $colon))); |
| 453 | if ($name !== $target) { |
| 454 | continue; |
| 455 | } |
| 456 | $value = trim(substr($decl, $colon + 1)); |
| 457 | return $value === '' ? null : $value; |
| 458 | } |
| 459 | return null; |
| 460 | } |
| 461 | |
| 462 | private function parseNumberPrefix(string $raw): ?float |
| 463 | { |
| 464 | if (preg_match('/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)/', $raw, $m) !== 1) { |
| 465 | return null; |
| 466 | } |
| 467 | return (float) $m[1]; |
| 468 | } |
| 469 | |
| 470 | /** |
| 471 | * Parse the `points` attribute grammar (SVG 2 §9.7) — a list of `(x, y)` |
| 472 | * coordinate pairs separated by comma-or-whitespace. Per spec, a malformed |
| 473 | * tail (odd count, non-numeric value) terminates parsing; pairs read |
| 474 | * before the error are kept. |
| 475 | * |
| 476 | * @return list<array{float, float}> |
| 477 | */ |
| 478 | protected static function parsePoints(?string $raw): array |
| 479 | { |
| 480 | if ($raw === null || trim($raw) === '') { |
| 481 | return []; |
| 482 | } |
| 483 | $numberPattern = '[+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?'; |
| 484 | if (preg_match_all('/' . $numberPattern . '/', $raw, $m) === false) { |
| 485 | return []; |
| 486 | } |
| 487 | $values = $m[0]; |
| 488 | if ($values === []) { |
| 489 | return []; |
| 490 | } |
| 491 | $pairs = []; |
| 492 | $count = (int) (count($values) / 2) * 2; |
| 493 | for ($i = 0; $i < $count; $i += 2) { |
| 494 | $pairs[] = [(float) $values[$i], (float) $values[$i + 1]]; |
| 495 | } |
| 496 | return $pairs; |
| 497 | } |
| 498 | } |