Matthias Andreas Benkard | 12a5735 | 2021-12-28 18:02:04 +0100 | [diff] [blame^] | 1 | <?php |
| 2 | |
| 3 | /* |
| 4 | * This file is part of Twig. |
| 5 | * |
| 6 | * (c) Fabien Potencier |
| 7 | * (c) Armin Ronacher |
| 8 | * |
| 9 | * For the full copyright and license information, please view the LICENSE |
| 10 | * file that was distributed with this source code. |
| 11 | */ |
| 12 | |
| 13 | namespace Twig; |
| 14 | |
| 15 | use Twig\Error\SyntaxError; |
| 16 | use Twig\Node\BlockNode; |
| 17 | use Twig\Node\BlockReferenceNode; |
| 18 | use Twig\Node\BodyNode; |
| 19 | use Twig\Node\Expression\AbstractExpression; |
| 20 | use Twig\Node\MacroNode; |
| 21 | use Twig\Node\ModuleNode; |
| 22 | use Twig\Node\Node; |
| 23 | use Twig\Node\NodeCaptureInterface; |
| 24 | use Twig\Node\NodeOutputInterface; |
| 25 | use Twig\Node\PrintNode; |
| 26 | use Twig\Node\TextNode; |
| 27 | use Twig\TokenParser\TokenParserInterface; |
| 28 | |
| 29 | /** |
| 30 | * @author Fabien Potencier <fabien@symfony.com> |
| 31 | */ |
| 32 | class Parser |
| 33 | { |
| 34 | private $stack = []; |
| 35 | private $stream; |
| 36 | private $parent; |
| 37 | private $visitors; |
| 38 | private $expressionParser; |
| 39 | private $blocks; |
| 40 | private $blockStack; |
| 41 | private $macros; |
| 42 | private $env; |
| 43 | private $importedSymbols; |
| 44 | private $traits; |
| 45 | private $embeddedTemplates = []; |
| 46 | private $varNameSalt = 0; |
| 47 | |
| 48 | public function __construct(Environment $env) |
| 49 | { |
| 50 | $this->env = $env; |
| 51 | } |
| 52 | |
| 53 | public function getVarName(): string |
| 54 | { |
| 55 | return sprintf('__internal_%s', hash('sha256', __METHOD__.$this->stream->getSourceContext()->getCode().$this->varNameSalt++)); |
| 56 | } |
| 57 | |
| 58 | public function parse(TokenStream $stream, $test = null, bool $dropNeedle = false): ModuleNode |
| 59 | { |
| 60 | $vars = get_object_vars($this); |
| 61 | unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser'], $vars['reservedMacroNames']); |
| 62 | $this->stack[] = $vars; |
| 63 | |
| 64 | // node visitors |
| 65 | if (null === $this->visitors) { |
| 66 | $this->visitors = $this->env->getNodeVisitors(); |
| 67 | } |
| 68 | |
| 69 | if (null === $this->expressionParser) { |
| 70 | $this->expressionParser = new ExpressionParser($this, $this->env); |
| 71 | } |
| 72 | |
| 73 | $this->stream = $stream; |
| 74 | $this->parent = null; |
| 75 | $this->blocks = []; |
| 76 | $this->macros = []; |
| 77 | $this->traits = []; |
| 78 | $this->blockStack = []; |
| 79 | $this->importedSymbols = [[]]; |
| 80 | $this->embeddedTemplates = []; |
| 81 | $this->varNameSalt = 0; |
| 82 | |
| 83 | try { |
| 84 | $body = $this->subparse($test, $dropNeedle); |
| 85 | |
| 86 | if (null !== $this->parent && null === $body = $this->filterBodyNodes($body)) { |
| 87 | $body = new Node(); |
| 88 | } |
| 89 | } catch (SyntaxError $e) { |
| 90 | if (!$e->getSourceContext()) { |
| 91 | $e->setSourceContext($this->stream->getSourceContext()); |
| 92 | } |
| 93 | |
| 94 | if (!$e->getTemplateLine()) { |
| 95 | $e->setTemplateLine($this->stream->getCurrent()->getLine()); |
| 96 | } |
| 97 | |
| 98 | throw $e; |
| 99 | } |
| 100 | |
| 101 | $node = new ModuleNode(new BodyNode([$body]), $this->parent, new Node($this->blocks), new Node($this->macros), new Node($this->traits), $this->embeddedTemplates, $stream->getSourceContext()); |
| 102 | |
| 103 | $traverser = new NodeTraverser($this->env, $this->visitors); |
| 104 | |
| 105 | $node = $traverser->traverse($node); |
| 106 | |
| 107 | // restore previous stack so previous parse() call can resume working |
| 108 | foreach (array_pop($this->stack) as $key => $val) { |
| 109 | $this->$key = $val; |
| 110 | } |
| 111 | |
| 112 | return $node; |
| 113 | } |
| 114 | |
| 115 | public function subparse($test, bool $dropNeedle = false): Node |
| 116 | { |
| 117 | $lineno = $this->getCurrentToken()->getLine(); |
| 118 | $rv = []; |
| 119 | while (!$this->stream->isEOF()) { |
| 120 | switch ($this->getCurrentToken()->getType()) { |
| 121 | case /* Token::TEXT_TYPE */ 0: |
| 122 | $token = $this->stream->next(); |
| 123 | $rv[] = new TextNode($token->getValue(), $token->getLine()); |
| 124 | break; |
| 125 | |
| 126 | case /* Token::VAR_START_TYPE */ 2: |
| 127 | $token = $this->stream->next(); |
| 128 | $expr = $this->expressionParser->parseExpression(); |
| 129 | $this->stream->expect(/* Token::VAR_END_TYPE */ 4); |
| 130 | $rv[] = new PrintNode($expr, $token->getLine()); |
| 131 | break; |
| 132 | |
| 133 | case /* Token::BLOCK_START_TYPE */ 1: |
| 134 | $this->stream->next(); |
| 135 | $token = $this->getCurrentToken(); |
| 136 | |
| 137 | if (/* Token::NAME_TYPE */ 5 !== $token->getType()) { |
| 138 | throw new SyntaxError('A block must start with a tag name.', $token->getLine(), $this->stream->getSourceContext()); |
| 139 | } |
| 140 | |
| 141 | if (null !== $test && $test($token)) { |
| 142 | if ($dropNeedle) { |
| 143 | $this->stream->next(); |
| 144 | } |
| 145 | |
| 146 | if (1 === \count($rv)) { |
| 147 | return $rv[0]; |
| 148 | } |
| 149 | |
| 150 | return new Node($rv, [], $lineno); |
| 151 | } |
| 152 | |
| 153 | if (!$subparser = $this->env->getTokenParser($token->getValue())) { |
| 154 | if (null !== $test) { |
| 155 | $e = new SyntaxError(sprintf('Unexpected "%s" tag', $token->getValue()), $token->getLine(), $this->stream->getSourceContext()); |
| 156 | |
| 157 | if (\is_array($test) && isset($test[0]) && $test[0] instanceof TokenParserInterface) { |
| 158 | $e->appendMessage(sprintf(' (expecting closing tag for the "%s" tag defined near line %s).', $test[0]->getTag(), $lineno)); |
| 159 | } |
| 160 | } else { |
| 161 | $e = new SyntaxError(sprintf('Unknown "%s" tag.', $token->getValue()), $token->getLine(), $this->stream->getSourceContext()); |
| 162 | $e->addSuggestions($token->getValue(), array_keys($this->env->getTokenParsers())); |
| 163 | } |
| 164 | |
| 165 | throw $e; |
| 166 | } |
| 167 | |
| 168 | $this->stream->next(); |
| 169 | |
| 170 | $subparser->setParser($this); |
| 171 | $node = $subparser->parse($token); |
| 172 | if (null !== $node) { |
| 173 | $rv[] = $node; |
| 174 | } |
| 175 | break; |
| 176 | |
| 177 | default: |
| 178 | throw new SyntaxError('Lexer or parser ended up in unsupported state.', $this->getCurrentToken()->getLine(), $this->stream->getSourceContext()); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | if (1 === \count($rv)) { |
| 183 | return $rv[0]; |
| 184 | } |
| 185 | |
| 186 | return new Node($rv, [], $lineno); |
| 187 | } |
| 188 | |
| 189 | public function getBlockStack(): array |
| 190 | { |
| 191 | return $this->blockStack; |
| 192 | } |
| 193 | |
| 194 | public function peekBlockStack() |
| 195 | { |
| 196 | return $this->blockStack[\count($this->blockStack) - 1] ?? null; |
| 197 | } |
| 198 | |
| 199 | public function popBlockStack(): void |
| 200 | { |
| 201 | array_pop($this->blockStack); |
| 202 | } |
| 203 | |
| 204 | public function pushBlockStack($name): void |
| 205 | { |
| 206 | $this->blockStack[] = $name; |
| 207 | } |
| 208 | |
| 209 | public function hasBlock(string $name): bool |
| 210 | { |
| 211 | return isset($this->blocks[$name]); |
| 212 | } |
| 213 | |
| 214 | public function getBlock(string $name): Node |
| 215 | { |
| 216 | return $this->blocks[$name]; |
| 217 | } |
| 218 | |
| 219 | public function setBlock(string $name, BlockNode $value): void |
| 220 | { |
| 221 | $this->blocks[$name] = new BodyNode([$value], [], $value->getTemplateLine()); |
| 222 | } |
| 223 | |
| 224 | public function hasMacro(string $name): bool |
| 225 | { |
| 226 | return isset($this->macros[$name]); |
| 227 | } |
| 228 | |
| 229 | public function setMacro(string $name, MacroNode $node): void |
| 230 | { |
| 231 | $this->macros[$name] = $node; |
| 232 | } |
| 233 | |
| 234 | public function addTrait($trait): void |
| 235 | { |
| 236 | $this->traits[] = $trait; |
| 237 | } |
| 238 | |
| 239 | public function hasTraits(): bool |
| 240 | { |
| 241 | return \count($this->traits) > 0; |
| 242 | } |
| 243 | |
| 244 | public function embedTemplate(ModuleNode $template) |
| 245 | { |
| 246 | $template->setIndex(mt_rand()); |
| 247 | |
| 248 | $this->embeddedTemplates[] = $template; |
| 249 | } |
| 250 | |
| 251 | public function addImportedSymbol(string $type, string $alias, string $name = null, AbstractExpression $node = null): void |
| 252 | { |
| 253 | $this->importedSymbols[0][$type][$alias] = ['name' => $name, 'node' => $node]; |
| 254 | } |
| 255 | |
| 256 | public function getImportedSymbol(string $type, string $alias) |
| 257 | { |
| 258 | // if the symbol does not exist in the current scope (0), try in the main/global scope (last index) |
| 259 | return $this->importedSymbols[0][$type][$alias] ?? ($this->importedSymbols[\count($this->importedSymbols) - 1][$type][$alias] ?? null); |
| 260 | } |
| 261 | |
| 262 | public function isMainScope(): bool |
| 263 | { |
| 264 | return 1 === \count($this->importedSymbols); |
| 265 | } |
| 266 | |
| 267 | public function pushLocalScope(): void |
| 268 | { |
| 269 | array_unshift($this->importedSymbols, []); |
| 270 | } |
| 271 | |
| 272 | public function popLocalScope(): void |
| 273 | { |
| 274 | array_shift($this->importedSymbols); |
| 275 | } |
| 276 | |
| 277 | public function getExpressionParser(): ExpressionParser |
| 278 | { |
| 279 | return $this->expressionParser; |
| 280 | } |
| 281 | |
| 282 | public function getParent(): ?Node |
| 283 | { |
| 284 | return $this->parent; |
| 285 | } |
| 286 | |
| 287 | public function setParent(?Node $parent): void |
| 288 | { |
| 289 | $this->parent = $parent; |
| 290 | } |
| 291 | |
| 292 | public function getStream(): TokenStream |
| 293 | { |
| 294 | return $this->stream; |
| 295 | } |
| 296 | |
| 297 | public function getCurrentToken(): Token |
| 298 | { |
| 299 | return $this->stream->getCurrent(); |
| 300 | } |
| 301 | |
| 302 | private function filterBodyNodes(Node $node, bool $nested = false): ?Node |
| 303 | { |
| 304 | // check that the body does not contain non-empty output nodes |
| 305 | if ( |
| 306 | ($node instanceof TextNode && !ctype_space($node->getAttribute('data'))) |
| 307 | || |
| 308 | (!$node instanceof TextNode && !$node instanceof BlockReferenceNode && $node instanceof NodeOutputInterface) |
| 309 | ) { |
| 310 | if (false !== strpos((string) $node, \chr(0xEF).\chr(0xBB).\chr(0xBF))) { |
| 311 | $t = substr($node->getAttribute('data'), 3); |
| 312 | if ('' === $t || ctype_space($t)) { |
| 313 | // bypass empty nodes starting with a BOM |
| 314 | return null; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | throw new SyntaxError('A template that extends another one cannot include content outside Twig blocks. Did you forget to put the content inside a {% block %} tag?', $node->getTemplateLine(), $this->stream->getSourceContext()); |
| 319 | } |
| 320 | |
| 321 | // bypass nodes that "capture" the output |
| 322 | if ($node instanceof NodeCaptureInterface) { |
| 323 | // a "block" tag in such a node will serve as a block definition AND be displayed in place as well |
| 324 | return $node; |
| 325 | } |
| 326 | |
| 327 | // "block" tags that are not captured (see above) are only used for defining |
| 328 | // the content of the block. In such a case, nesting it does not work as |
| 329 | // expected as the definition is not part of the default template code flow. |
| 330 | if ($nested && $node instanceof BlockReferenceNode) { |
| 331 | throw new SyntaxError('A block definition cannot be nested under non-capturing nodes.', $node->getTemplateLine(), $this->stream->getSourceContext()); |
| 332 | } |
| 333 | |
| 334 | if ($node instanceof NodeOutputInterface) { |
| 335 | return null; |
| 336 | } |
| 337 | |
| 338 | // here, $nested means "being at the root level of a child template" |
| 339 | // we need to discard the wrapping "Node" for the "body" node |
| 340 | $nested = $nested || Node::class !== \get_class($node); |
| 341 | foreach ($node as $k => $n) { |
| 342 | if (null !== $n && null === $this->filterBodyNodes($n, $nested)) { |
| 343 | $node->removeNode($k); |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | return $node; |
| 348 | } |
| 349 | } |