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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Css; |
| 6 | |
| 7 | use Phpdftk\Css\Selector\SelectorList; |
| 8 | use Phpdftk\Css\Sheet\AtRule; |
| 9 | use Phpdftk\Css\Sheet\AtRuleBlock; |
| 10 | use Phpdftk\Css\Sheet\Declaration; |
| 11 | use Phpdftk\Css\Sheet\Origin; |
| 12 | use Phpdftk\Css\Sheet\Rule; |
| 13 | use Phpdftk\Css\Sheet\Stylesheet; |
| 14 | use Phpdftk\Css\Sheet\StyleRule; |
| 15 | use Phpdftk\Css\Token\AtKeywordToken; |
| 16 | use Phpdftk\Css\Token\CdcToken; |
| 17 | use Phpdftk\Css\Token\CdoToken; |
| 18 | use Phpdftk\Css\Token\ColonToken; |
| 19 | use Phpdftk\Css\Token\DelimToken; |
| 20 | use Phpdftk\Css\Token\EofToken; |
| 21 | use Phpdftk\Css\Token\FunctionToken; |
| 22 | use Phpdftk\Css\Token\IdentToken; |
| 23 | use Phpdftk\Css\Token\LeftBraceToken; |
| 24 | use Phpdftk\Css\Token\LeftBracketToken; |
| 25 | use Phpdftk\Css\Token\LeftParenToken; |
| 26 | use Phpdftk\Css\Token\RightBraceToken; |
| 27 | use Phpdftk\Css\Token\RightBracketToken; |
| 28 | use Phpdftk\Css\Token\RightParenToken; |
| 29 | use Phpdftk\Css\Token\SemicolonToken; |
| 30 | use Phpdftk\Css\Token\Token; |
| 31 | use Phpdftk\Css\Token\WhitespaceToken; |
| 32 | use Phpdftk\Css\Value\Value; |
| 33 | |
| 34 | /** |
| 35 | * Stylesheet-level parser per CSS Syntax Module 3 §5 ("Parsing"). |
| 36 | * |
| 37 | * Tokenizes the input, then runs the spec's "consume a list of rules" / |
| 38 | * "consume an at-rule" / "consume a qualified rule" / "consume a list of |
| 39 | * declarations" sub-algorithms. Output is a typed {@see Stylesheet} tree. |
| 40 | * |
| 41 | * Value parsing inside declarations delegates to {@see ValueParser}. |
| 42 | * Selector parsing is deferred to Phase 1D — for now {@see StyleRule}'s |
| 43 | * `SelectorList` carries the raw selector text. |
| 44 | */ |
| 45 | final class Parser |
| 46 | { |
| 47 | private readonly ValueParser $valueParser; |
| 48 | |
| 49 | public function __construct(?ValueParser $valueParser = null) |
| 50 | { |
| 51 | $this->valueParser = $valueParser ?? new ValueParser(); |
| 52 | } |
| 53 | |
| 54 | public function parseStylesheet(string $css, Origin $origin = Origin::Author): Stylesheet |
| 55 | { |
| 56 | $tokens = (new Tokenizer($css))->tokenize(); |
| 57 | return new Stylesheet($this->consumeListOfRules($tokens, topLevel: true), $origin); |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Parse an HTML `style="…"` attribute (or any free-form declaration list) |
| 62 | * into a StyleRule with an empty selector. |
| 63 | */ |
| 64 | public function parseInlineStyle(string $css): StyleRule |
| 65 | { |
| 66 | $tokens = (new Tokenizer($css))->tokenize(); |
| 67 | return new StyleRule(new SelectorList(''), $this->consumeListOfDeclarations($tokens)); |
| 68 | } |
| 69 | |
| 70 | public function parseValue(string $css, string $propertyHint = ''): Value |
| 71 | { |
| 72 | return $this->valueParser->parseFromString($css); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * @param list<Token> $tokens |
| 77 | * @return list<Rule> |
| 78 | */ |
| 79 | private function consumeListOfRules(array $tokens, bool $topLevel): array |
| 80 | { |
| 81 | $rules = []; |
| 82 | $i = 0; |
| 83 | $n = count($tokens); |
| 84 | while ($i < $n) { |
| 85 | $t = $tokens[$i]; |
| 86 | if ($t instanceof WhitespaceToken) { |
| 87 | $i++; |
| 88 | continue; |
| 89 | } |
| 90 | if ($t instanceof EofToken) { |
| 91 | break; |
| 92 | } |
| 93 | if (($t instanceof CdoToken || $t instanceof CdcToken) && $topLevel) { |
| 94 | $i++; |
| 95 | continue; |
| 96 | } |
| 97 | if ($t instanceof AtKeywordToken) { |
| 98 | $rules[] = $this->consumeAtRule($tokens, $i); |
| 99 | continue; |
| 100 | } |
| 101 | // Qualified rule (style rule). |
| 102 | $rule = $this->consumeQualifiedRule($tokens, $i); |
| 103 | if ($rule !== null) { |
| 104 | $rules[] = $rule; |
| 105 | } |
| 106 | } |
| 107 | return $rules; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Consume an at-rule. Advances $i past the rule. |
| 112 | * |
| 113 | * @param list<Token> $tokens |
| 114 | */ |
| 115 | private function consumeAtRule(array $tokens, int &$i): AtRule |
| 116 | { |
| 117 | $name = $tokens[$i] instanceof AtKeywordToken ? $tokens[$i]->value : ''; |
| 118 | $i++; |
| 119 | $prelude = []; |
| 120 | $depth = 0; |
| 121 | $n = count($tokens); |
| 122 | while ($i < $n) { |
| 123 | $t = $tokens[$i]; |
| 124 | if ($depth === 0 && $t instanceof SemicolonToken) { |
| 125 | $i++; |
| 126 | return new AtRule($name, self::serializePrelude($prelude), null); |
| 127 | } |
| 128 | if ($t instanceof EofToken) { |
| 129 | return new AtRule($name, self::serializePrelude($prelude), null); |
| 130 | } |
| 131 | if ($depth === 0 && $t instanceof LeftBraceToken) { |
| 132 | $i++; |
| 133 | $blockTokens = $this->consumeBlock($tokens, $i); |
| 134 | $block = new AtRuleBlock($this->parseAtRuleBlockContents($name, $blockTokens)); |
| 135 | return new AtRule($name, self::serializePrelude($prelude), $block); |
| 136 | } |
| 137 | if ($t instanceof LeftParenToken || $t instanceof LeftBracketToken || $t instanceof FunctionToken) { |
| 138 | $depth++; |
| 139 | } elseif ($t instanceof RightParenToken || $t instanceof RightBracketToken) { |
| 140 | if ($depth > 0) { |
| 141 | $depth--; |
| 142 | } |
| 143 | } |
| 144 | $prelude[] = $t; |
| 145 | $i++; |
| 146 | } |
| 147 | return new AtRule($name, self::serializePrelude($prelude), null); |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * Consume a qualified rule (selector + declaration block). Advances $i. |
| 152 | * |
| 153 | * @param list<Token> $tokens |
| 154 | */ |
| 155 | private function consumeQualifiedRule(array $tokens, int &$i): ?StyleRule |
| 156 | { |
| 157 | $prelude = []; |
| 158 | $depth = 0; |
| 159 | $n = count($tokens); |
| 160 | while ($i < $n) { |
| 161 | $t = $tokens[$i]; |
| 162 | if ($t instanceof EofToken) { |
| 163 | return null; // parse error: missing block |
| 164 | } |
| 165 | if ($depth === 0 && $t instanceof LeftBraceToken) { |
| 166 | $i++; |
| 167 | $blockTokens = $this->consumeBlock($tokens, $i); |
| 168 | $preludeText = trim(self::serializePrelude($prelude)); |
| 169 | $selectors = \Phpdftk\Css\Selector\SelectorParser::parseTokens($prelude, $preludeText); |
| 170 | return new StyleRule( |
| 171 | $selectors, |
| 172 | $this->consumeListOfDeclarations($blockTokens), |
| 173 | ); |
| 174 | } |
| 175 | if ($t instanceof LeftParenToken || $t instanceof LeftBracketToken || $t instanceof FunctionToken) { |
| 176 | $depth++; |
| 177 | } elseif ($t instanceof RightParenToken || $t instanceof RightBracketToken) { |
| 178 | if ($depth > 0) { |
| 179 | $depth--; |
| 180 | } |
| 181 | } |
| 182 | $prelude[] = $t; |
| 183 | $i++; |
| 184 | } |
| 185 | return null; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Consume the inside of a `{ ... }` block. Assumes $i is just past the |
| 190 | * opening brace; advances past the closing brace. |
| 191 | * |
| 192 | * @param list<Token> $tokens |
| 193 | * @return list<Token> |
| 194 | */ |
| 195 | private function consumeBlock(array $tokens, int &$i): array |
| 196 | { |
| 197 | $contents = []; |
| 198 | $depth = 1; |
| 199 | $n = count($tokens); |
| 200 | // Loop terminates from inside on EOF or matching close brace; the |
| 201 | // depth check at the top is always true here, so we use just $i < $n. |
| 202 | while ($i < $n) { |
| 203 | $t = $tokens[$i]; |
| 204 | if ($t instanceof EofToken) { |
| 205 | break; |
| 206 | } |
| 207 | if ($t instanceof LeftBraceToken) { |
| 208 | $depth++; |
| 209 | $contents[] = $t; |
| 210 | $i++; |
| 211 | continue; |
| 212 | } |
| 213 | if ($t instanceof RightBraceToken) { |
| 214 | $depth--; |
| 215 | if ($depth === 0) { |
| 216 | $i++; |
| 217 | break; |
| 218 | } |
| 219 | $contents[] = $t; |
| 220 | $i++; |
| 221 | continue; |
| 222 | } |
| 223 | $contents[] = $t; |
| 224 | $i++; |
| 225 | } |
| 226 | return $contents; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * Parse a list of declarations from a block-content token list. Per CSS |
| 231 | * Syntax 3 §5.4.4. Semicolon-separated; each non-empty section is one |
| 232 | * declaration (or a parse error to drop). |
| 233 | * |
| 234 | * @param list<Token> $tokens |
| 235 | * @return list<Declaration> |
| 236 | */ |
| 237 | private function consumeListOfDeclarations(array $tokens): array |
| 238 | { |
| 239 | $declarations = []; |
| 240 | $current = []; |
| 241 | $depth = 0; |
| 242 | $i = 0; |
| 243 | $n = count($tokens); |
| 244 | while ($i < $n) { |
| 245 | $t = $tokens[$i]; |
| 246 | if ($depth === 0 && $t instanceof SemicolonToken) { |
| 247 | $decl = $this->parseDeclarationFromTokens($current); |
| 248 | if ($decl !== null) { |
| 249 | $declarations[] = $decl; |
| 250 | } |
| 251 | $current = []; |
| 252 | $i++; |
| 253 | continue; |
| 254 | } |
| 255 | if ($t instanceof LeftParenToken || $t instanceof LeftBracketToken |
| 256 | || $t instanceof LeftBraceToken || $t instanceof FunctionToken |
| 257 | ) { |
| 258 | $depth++; |
| 259 | } elseif ($t instanceof RightParenToken || $t instanceof RightBracketToken |
| 260 | || $t instanceof RightBraceToken |
| 261 | ) { |
| 262 | if ($depth > 0) { |
| 263 | $depth--; |
| 264 | } |
| 265 | } |
| 266 | $current[] = $t; |
| 267 | $i++; |
| 268 | } |
| 269 | $decl = $this->parseDeclarationFromTokens($current); |
| 270 | if ($decl !== null) { |
| 271 | $declarations[] = $decl; |
| 272 | } |
| 273 | return $declarations; |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * Turn a "section" of tokens (the part between two `;` boundaries) into |
| 278 | * a Declaration, or return null if it doesn't shape as one. |
| 279 | * |
| 280 | * @param list<Token> $tokens |
| 281 | */ |
| 282 | private function parseDeclarationFromTokens(array $tokens): ?Declaration |
| 283 | { |
| 284 | $tokens = self::trimWhitespace($tokens); |
| 285 | if ($tokens === []) { |
| 286 | return null; |
| 287 | } |
| 288 | $head = $tokens[0]; |
| 289 | if (!$head instanceof IdentToken) { |
| 290 | return null; |
| 291 | } |
| 292 | $property = strtolower($head->value); |
| 293 | // Find the colon. |
| 294 | $colonIdx = null; |
| 295 | for ($i = 1; $i < count($tokens); $i++) { |
| 296 | if ($tokens[$i] instanceof ColonToken) { |
| 297 | $colonIdx = $i; |
| 298 | break; |
| 299 | } |
| 300 | if (!$tokens[$i] instanceof WhitespaceToken) { |
| 301 | return null; // unexpected token before colon |
| 302 | } |
| 303 | } |
| 304 | if ($colonIdx === null) { |
| 305 | return null; |
| 306 | } |
| 307 | $valueTokens = array_slice($tokens, $colonIdx + 1); |
| 308 | $valueTokens = self::trimWhitespace($valueTokens); |
| 309 | // Check for !important suffix. |
| 310 | $important = false; |
| 311 | if (count($valueTokens) >= 2) { |
| 312 | $lastIdx = count($valueTokens) - 1; |
| 313 | $tail = $valueTokens[$lastIdx]; |
| 314 | $beforeTail = null; |
| 315 | $bangIdx = null; |
| 316 | for ($j = $lastIdx; $j >= 0; $j--) { |
| 317 | $tt = $valueTokens[$j]; |
| 318 | if ($tt instanceof DelimToken && $tt->value === '!') { |
| 319 | $bangIdx = $j; |
| 320 | break; |
| 321 | } |
| 322 | if (!$tt instanceof IdentToken && !$tt instanceof WhitespaceToken) { |
| 323 | break; |
| 324 | } |
| 325 | } |
| 326 | if ($bangIdx !== null) { |
| 327 | // Whatever's after the `!` must be `important` (case-insensitive). |
| 328 | $after = self::trimWhitespace(array_slice($valueTokens, $bangIdx + 1)); |
| 329 | if (count($after) === 1 |
| 330 | && $after[0] instanceof IdentToken |
| 331 | && strcasecmp($after[0]->value, 'important') === 0 |
| 332 | ) { |
| 333 | $important = true; |
| 334 | $valueTokens = self::trimWhitespace(array_slice($valueTokens, 0, $bangIdx)); |
| 335 | } |
| 336 | } |
| 337 | } |
| 338 | $value = $this->valueParser->parse($valueTokens); |
| 339 | // CSS Transforms 2 §6: the `transform` property's value is a |
| 340 | // list of transform-functions. Post-process the generic |
| 341 | // `CssFunction`/`ValueList` into a typed `Transform` so the |
| 342 | // painter can consume it directly without re-parsing. |
| 343 | if ($property === 'transform') { |
| 344 | $value = $this->valueParser->postProcessTransform($value); |
| 345 | } |
| 346 | return new Declaration($property, $value, $important); |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * Parse the body of an at-rule block: try each comma-or-semicolon-free |
| 351 | * section as a declaration first, then as a rule. For declaration-only |
| 352 | * at-rules (`@font-face`, `@page`, `@property`, `@counter-style`) the |
| 353 | * decl path wins; for nested-rule at-rules (`@media`, `@supports`, |
| 354 | * `@keyframes`'s blocks) the rule path wins. |
| 355 | * |
| 356 | * @param list<Token> $tokens |
| 357 | * @return list<Rule|Declaration> |
| 358 | */ |
| 359 | private function parseAtRuleBlockContents(string $atRuleName, array $tokens): array |
| 360 | { |
| 361 | $lcName = strtolower($atRuleName); |
| 362 | $declOnly = ['font-face', 'property', 'counter-style', 'font-feature-values']; |
| 363 | // CSS Paged Media 3 §3.6 margin-box at-rules (the 16 positions); |
| 364 | // each one contains declarations only (`content`, `font-size`, |
| 365 | // `color`, etc.). Treat them as declaration-only. |
| 366 | $marginBoxRules = [ |
| 367 | 'top-left-corner', 'top-left', 'top-center', 'top-right', 'top-right-corner', |
| 368 | 'right-top', 'right-middle', 'right-bottom', |
| 369 | 'bottom-right-corner', 'bottom-right', 'bottom-center', 'bottom-left', 'bottom-left-corner', |
| 370 | 'left-bottom', 'left-middle', 'left-top', |
| 371 | ]; |
| 372 | if (in_array($lcName, $declOnly, true) || in_array($lcName, $marginBoxRules, true)) { |
| 373 | return $this->consumeListOfDeclarations($tokens); |
| 374 | } |
| 375 | // CSS Paged Media 3 §3: `@page` blocks can contain BOTH |
| 376 | // declarations (the page box's own props like margin/size) AND |
| 377 | // nested at-rules (the 16 margin-box at-rules). Use the |
| 378 | // mixed-content parser for it. |
| 379 | if ($lcName === 'page') { |
| 380 | return $this->consumeDeclarationsAndAtRules($tokens); |
| 381 | } |
| 382 | // Otherwise parse as a rule list. |
| 383 | return $this->consumeListOfRules($tokens, topLevel: false); |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * Parse a block that may contain either declarations (`prop: value;`) |
| 388 | * or nested at-rules (`@name { ... }`). Used for `@page` per CSS |
| 389 | * Paged Media 3 §3 — the page box's own properties live alongside |
| 390 | * its margin-box at-rules. Section boundaries are `;` (closes a |
| 391 | * declaration) or a `{...}` block (closes an at-rule). |
| 392 | * |
| 393 | * @param list<Token> $tokens |
| 394 | * @return list<Rule|Declaration> |
| 395 | */ |
| 396 | private function consumeDeclarationsAndAtRules(array $tokens): array |
| 397 | { |
| 398 | $out = []; |
| 399 | $i = 0; |
| 400 | $n = count($tokens); |
| 401 | while ($i < $n) { |
| 402 | $t = $tokens[$i]; |
| 403 | if ($t instanceof WhitespaceToken || $t instanceof SemicolonToken) { |
| 404 | $i++; |
| 405 | continue; |
| 406 | } |
| 407 | if ($t instanceof AtKeywordToken) { |
| 408 | $out[] = $this->consumeAtRule($tokens, $i); |
| 409 | continue; |
| 410 | } |
| 411 | // Collect a declaration: tokens up to next top-level `;` or |
| 412 | // end of input. Don't break inside braces (a value can carry |
| 413 | // a function call with parens; we don't expect braces inside |
| 414 | // a declaration, but stay defensive). |
| 415 | $start = $i; |
| 416 | $depth = 0; |
| 417 | while ($i < $n) { |
| 418 | $u = $tokens[$i]; |
| 419 | if ($depth === 0 && $u instanceof SemicolonToken) { |
| 420 | break; |
| 421 | } |
| 422 | if ($u instanceof LeftParenToken || $u instanceof LeftBracketToken |
| 423 | || $u instanceof LeftBraceToken || $u instanceof FunctionToken |
| 424 | ) { |
| 425 | $depth++; |
| 426 | } elseif ($u instanceof RightParenToken || $u instanceof RightBracketToken |
| 427 | || $u instanceof RightBraceToken |
| 428 | ) { |
| 429 | if ($depth > 0) { |
| 430 | $depth--; |
| 431 | } |
| 432 | } |
| 433 | $i++; |
| 434 | } |
| 435 | $section = array_slice($tokens, $start, $i - $start); |
| 436 | $decl = $this->parseDeclarationFromTokens($section); |
| 437 | if ($decl !== null) { |
| 438 | $out[] = $decl; |
| 439 | } |
| 440 | // Skip the `;` if present. |
| 441 | if ($i < $n && $tokens[$i] instanceof SemicolonToken) { |
| 442 | $i++; |
| 443 | } |
| 444 | } |
| 445 | return $out; |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * Render a prelude (or selector) token list back to a normalised string: |
| 450 | * collapse runs of whitespace, trim ends, preserve the rest verbatim. |
| 451 | * |
| 452 | * @param list<Token> $tokens |
| 453 | */ |
| 454 | private static function serializePrelude(array $tokens): string |
| 455 | { |
| 456 | $out = ''; |
| 457 | $lastWasSpace = false; |
| 458 | foreach ($tokens as $t) { |
| 459 | $piece = self::tokenToText($t); |
| 460 | if ($t instanceof WhitespaceToken) { |
| 461 | if (!$lastWasSpace && $out !== '') { |
| 462 | $out .= ' '; |
| 463 | $lastWasSpace = true; |
| 464 | } |
| 465 | continue; |
| 466 | } |
| 467 | $out .= $piece; |
| 468 | $lastWasSpace = false; |
| 469 | } |
| 470 | return trim($out); |
| 471 | } |
| 472 | |
| 473 | private static function tokenToText(Token $t): string |
| 474 | { |
| 475 | return match (true) { |
| 476 | $t instanceof IdentToken => $t->value, |
| 477 | $t instanceof AtKeywordToken => '@' . $t->value, |
| 478 | $t instanceof FunctionToken => $t->name . '(', |
| 479 | $t instanceof \Phpdftk\Css\Token\HashToken => '#' . $t->value, |
| 480 | $t instanceof \Phpdftk\Css\Token\StringToken => '"' . str_replace('"', '\\"', $t->value) . '"', |
| 481 | $t instanceof \Phpdftk\Css\Token\UrlToken => 'url(' . $t->value . ')', |
| 482 | $t instanceof \Phpdftk\Css\Token\NumberToken => (string) (fmod($t->value, 1.0) === 0.0 ? (int) $t->value : $t->value), |
| 483 | $t instanceof \Phpdftk\Css\Token\PercentageToken => (string) (fmod($t->value, 1.0) === 0.0 ? (int) $t->value : $t->value) . '%', |
| 484 | $t instanceof \Phpdftk\Css\Token\DimensionToken => (string) (fmod($t->value, 1.0) === 0.0 ? (int) $t->value : $t->value) . $t->unit, |
| 485 | $t instanceof DelimToken => $t->value, |
| 486 | $t instanceof ColonToken => ':', |
| 487 | $t instanceof SemicolonToken => ';', |
| 488 | $t instanceof \Phpdftk\Css\Token\CommaToken => ',', |
| 489 | $t instanceof LeftParenToken => '(', |
| 490 | $t instanceof RightParenToken => ')', |
| 491 | $t instanceof LeftBracketToken => '[', |
| 492 | $t instanceof RightBracketToken => ']', |
| 493 | $t instanceof LeftBraceToken => '{', |
| 494 | $t instanceof RightBraceToken => '}', |
| 495 | $t instanceof WhitespaceToken => ' ', |
| 496 | $t instanceof CdoToken => '<!--', |
| 497 | $t instanceof CdcToken => '-->', |
| 498 | default => '', |
| 499 | }; |
| 500 | } |
| 501 | |
| 502 | /** |
| 503 | * @param list<Token> $tokens |
| 504 | * @return list<Token> |
| 505 | */ |
| 506 | private static function trimWhitespace(array $tokens): array |
| 507 | { |
| 508 | $start = 0; |
| 509 | $end = count($tokens) - 1; |
| 510 | while ($start <= $end && ($tokens[$start] instanceof WhitespaceToken || $tokens[$start] instanceof EofToken)) { |
| 511 | $start++; |
| 512 | } |
| 513 | while ($end >= $start && ($tokens[$end] instanceof WhitespaceToken || $tokens[$end] instanceof EofToken)) { |
| 514 | $end--; |
| 515 | } |
| 516 | return array_slice($tokens, $start, $end - $start + 1); |
| 517 | } |
| 518 | } |