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Parser.php
001 <?php
002
003 /*
004 * This file is part of Twig.
005 *
006 * (c) 2009 Fabien Potencier
007 * (c) 2009 Armin Ronacher
008 *
009 * For the full copyright and license information, please view the LICENSE
010 * file that was distributed with this source code.
011 */
012
013 /**
014 * Default parser implementation.
015 *
016 * @author Fabien Potencier <fabien@symfony.com>
017 */
018 class Twig_Parser implements Twig_ParserInterface
019 {
020 protected $stack = array();
021 protected $stream;
022 protected $parent;
023 protected $handlers;
024 protected $visitors;
025 protected $expressionParser;
026 protected $blocks;
027 protected $blockStack;
028 protected $macros;
029 protected $env;
030 protected $reservedMacroNames;
031 protected $importedSymbols;
032 protected $traits;
033 protected $embeddedTemplates = array();
034
035 /**
036 * Constructor.
037 *
038 * @param Twig_Environment $env A Twig_Environment instance
039 */
040 public function __construct(Twig_Environment $env)
041 {
042 $this->env = $env;
043 }
044
045 public function getEnvironment()
046 {
047 return $this->env;
048 }
049
050 public function getVarName()
051 {
052 return sprintf('__internal_%s', hash('sha1', uniqid(mt_rand(), true), false));
053 }
054
055 public function getFilename()
056 {
057 return $this->stream->getFilename();
058 }
059
060 /**
061 * Converts a token stream to a node tree.
062 *
063 * @param Twig_TokenStream $stream A token stream instance
064 *
065 * @return Twig_Node_Module A node tree
066 */
067 public function parse(Twig_TokenStream $stream, $test = null, $dropNeedle = false)
068 {
069 // push all variables into the stack to keep the current state of the parser
070 $vars = get_object_vars($this);
071 unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser']);
072 $this->stack[] = $vars;
073
074 // tag handlers
075 if (null === $this->handlers) {
076 $this->handlers = $this->env->getTokenParsers();
077 $this->handlers->setParser($this);
078 }
079
080 // node visitors
081 if (null === $this->visitors) {
082 $this->visitors = $this->env->getNodeVisitors();
083 }
084
085 if (null === $this->expressionParser) {
086 $this->expressionParser = new Twig_ExpressionParser($this, $this->env->getUnaryOperators(), $this->env->getBinaryOperators());
087 }
088
089 $this->stream = $stream;
090 $this->parent = null;
091 $this->blocks = array();
092 $this->macros = array();
093 $this->traits = array();
094 $this->blockStack = array();
095 $this->importedSymbols = array(array());
096 $this->embeddedTemplates = array();
097
098 try {
099 $body = $this->subparse($test, $dropNeedle);
100
101 if (null !== $this->parent) {
102 if (null === $body = $this->filterBodyNodes($body)) {
103 $body = new Twig_Node();
104 }
105 }
106 } catch (Twig_Error_Syntax $e) {
107 if (!$e->getTemplateFile()) {
108 $e->setTemplateFile($this->getFilename());
109 }
110
111 if (!$e->getTemplateLine()) {
112 $e->setTemplateLine($this->stream->getCurrent()->getLine());
113 }
114
115 throw $e;
116 }
117
118 $node = new Twig_Node_Module(new Twig_Node_Body(array($body)), $this->parent, new Twig_Node($this->blocks), new Twig_Node($this->macros), new Twig_Node($this->traits), $this->embeddedTemplates, $this->getFilename());
119
120 $traverser = new Twig_NodeTraverser($this->env, $this->visitors);
121
122 $node = $traverser->traverse($node);
123
124 // restore previous stack so previous parse() call can resume working
125 foreach (array_pop($this->stack) as $key => $val) {
126 $this->$key = $val;
127 }
128
129 return $node;
130 }
131
132 public function subparse($test, $dropNeedle = false)
133 {
134 $lineno = $this->getCurrentToken()->getLine();
135 $rv = array();
136 while (!$this->stream->isEOF()) {
137 switch ($this->getCurrentToken()->getType()) {
138 case Twig_Token::TEXT_TYPE:
139 $token = $this->stream->next();
140 $rv[] = new Twig_Node_Text($token->getValue(), $token->getLine());
141 break;
142
143 case Twig_Token::VAR_START_TYPE:
144 $token = $this->stream->next();
145 $expr = $this->expressionParser->parseExpression();
146 $this->stream->expect(Twig_Token::VAR_END_TYPE);
147 $rv[] = new Twig_Node_Print($expr, $token->getLine());
148 break;
149
150 case Twig_Token::BLOCK_START_TYPE:
151 $this->stream->next();
152 $token = $this->getCurrentToken();
153
154 if ($token->getType() !== Twig_Token::NAME_TYPE) {
155 throw new Twig_Error_Syntax('A block must start with a tag name', $token->getLine(), $this->getFilename());
156 }
157
158 if (null !== $test && call_user_func($test, $token)) {
159 if ($dropNeedle) {
160 $this->stream->next();
161 }
162
163 if (1 === count($rv)) {
164 return $rv[0];
165 }
166
167 return new Twig_Node($rv, array(), $lineno);
168 }
169
170 $subparser = $this->handlers->getTokenParser($token->getValue());
171 if (null === $subparser) {
172 if (null !== $test) {
173 $error = sprintf('Unexpected tag name "%s"', $token->getValue());
174 if (is_array($test) && isset($test[0]) && $test[0] instanceof Twig_TokenParserInterface) {
175 $error .= sprintf(' (expecting closing tag for the "%s" tag defined near line %s)', $test[0]->getTag(), $lineno);
176 }
177
178 throw new Twig_Error_Syntax($error, $token->getLine(), $this->getFilename());
179 }
180
181 $message = sprintf('Unknown tag name "%s"', $token->getValue());
182 if ($alternatives = $this->env->computeAlternatives($token->getValue(), array_keys($this->env->getTags()))) {
183 $message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
184 }
185
186 throw new Twig_Error_Syntax($message, $token->getLine(), $this->getFilename());
187 }
188
189 $this->stream->next();
190
191 $node = $subparser->parse($token);
192 if (null !== $node) {
193 $rv[] = $node;
194 }
195 break;
196
197 default:
198 throw new Twig_Error_Syntax('Lexer or parser ended up in unsupported state.', 0, $this->getFilename());
199 }
200 }
201
202 if (1 === count($rv)) {
203 return $rv[0];
204 }
205
206 return new Twig_Node($rv, array(), $lineno);
207 }
208
209 public function addHandler($name, $class)
210 {
211 $this->handlers[$name] = $class;
212 }
213
214 public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
215 {
216 $this->visitors[] = $visitor;
217 }
218
219 public function getBlockStack()
220 {
221 return $this->blockStack;
222 }
223
224 public function peekBlockStack()
225 {
226 return $this->blockStack[count($this->blockStack) - 1];
227 }
228
229 public function popBlockStack()
230 {
231 array_pop($this->blockStack);
232 }
233
234 public function pushBlockStack($name)
235 {
236 $this->blockStack[] = $name;
237 }
238
239 public function hasBlock($name)
240 {
241 return isset($this->blocks[$name]);
242 }
243
244 public function getBlock($name)
245 {
246 return $this->blocks[$name];
247 }
248
249 public function setBlock($name, $value)
250 {
251 $this->blocks[$name] = new Twig_Node_Body(array($value), array(), $value->getLine());
252 }
253
254 public function hasMacro($name)
255 {
256 return isset($this->macros[$name]);
257 }
258
259 public function setMacro($name, Twig_Node_Macro $node)
260 {
261 if (null === $this->reservedMacroNames) {
262 $this->reservedMacroNames = array();
263 $r = new ReflectionClass($this->env->getBaseTemplateClass());
264 foreach ($r->getMethods() as $method) {
265 $this->reservedMacroNames[] = $method->getName();
266 }
267 }
268
269 if (in_array($name, $this->reservedMacroNames)) {
270 throw new Twig_Error_Syntax(sprintf('"%s" cannot be used as a macro name as it is a reserved keyword', $name), $node->getLine(), $this->getFilename());
271 }
272
273 $this->macros[$name] = $node;
274 }
275
276 public function addTrait($trait)
277 {
278 $this->traits[] = $trait;
279 }
280
281 public function hasTraits()
282 {
283 return count($this->traits) > 0;
284 }
285
286 public function embedTemplate(Twig_Node_Module $template)
287 {
288 $template->setIndex(mt_rand());
289
290 $this->embeddedTemplates[] = $template;
291 }
292
293 public function addImportedSymbol($type, $alias, $name = null, Twig_Node_Expression $node = null)
294 {
295 $this->importedSymbols[0][$type][$alias] = array('name' => $name, 'node' => $node);
296 }
297
298 public function getImportedSymbol($type, $alias)
299 {
300 foreach ($this->importedSymbols as $functions) {
301 if (isset($functions[$type][$alias])) {
302 return $functions[$type][$alias];
303 }
304 }
305 }
306
307 public function isMainScope()
308 {
309 return 1 === count($this->importedSymbols);
310 }
311
312 public function pushLocalScope()
313 {
314 array_unshift($this->importedSymbols, array());
315 }
316
317 public function popLocalScope()
318 {
319 array_shift($this->importedSymbols);
320 }
321
322 /**
323 * Gets the expression parser.
324 *
325 * @return Twig_ExpressionParser The expression parser
326 */
327 public function getExpressionParser()
328 {
329 return $this->expressionParser;
330 }
331
332 public function getParent()
333 {
334 return $this->parent;
335 }
336
337 public function setParent($parent)
338 {
339 $this->parent = $parent;
340 }
341
342 /**
343 * Gets the token stream.
344 *
345 * @return Twig_TokenStream The token stream
346 */
347 public function getStream()
348 {
349 return $this->stream;
350 }
351
352 /**
353 * Gets the current token.
354 *
355 * @return Twig_Token The current token
356 */
357 public function getCurrentToken()
358 {
359 return $this->stream->getCurrent();
360 }
361
362 protected function filterBodyNodes(Twig_NodeInterface $node)
363 {
364 // check that the body does not contain non-empty output nodes
365 if (
366 ($node instanceof Twig_Node_Text && !ctype_space($node->getAttribute('data')))
367 ||
368 (!$node instanceof Twig_Node_Text && !$node instanceof Twig_Node_BlockReference && $node instanceof Twig_NodeOutputInterface)
369 ) {
370 if (false !== strpos((string) $node, chr(0xEF).chr(0xBB).chr(0xBF))) {
371 throw new Twig_Error_Syntax('A template that extends another one cannot have a body but a byte order mark (BOM) has been detected; it must be removed.', $node->getLine(), $this->getFilename());
372 }
373
374 throw new Twig_Error_Syntax('A template that extends another one cannot have a body.', $node->getLine(), $this->getFilename());
375 }
376
377 // bypass "set" nodes as they "capture" the output
378 if ($node instanceof Twig_Node_Set) {
379 return $node;
380 }
381
382 if ($node instanceof Twig_NodeOutputInterface) {
383 return;
384 }
385
386 foreach ($node as $k => $n) {
387 if (null !== $n && null === $n = $this->filterBodyNodes($n)) {
388 $node->removeNode($k);
389 }
390 }
391
392 return $node;
393 }
394 }
395