This file is indexed.

/usr/share/php/Twig/Parser.php is in php-twig 1.16.2-1+deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
<?php

/*
 * This file is part of Twig.
 *
 * (c) 2009 Fabien Potencier
 * (c) 2009 Armin Ronacher
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Default parser implementation.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Twig_Parser implements Twig_ParserInterface
{
    protected $stack = array();
    protected $stream;
    protected $parent;
    protected $handlers;
    protected $visitors;
    protected $expressionParser;
    protected $blocks;
    protected $blockStack;
    protected $macros;
    protected $env;
    protected $reservedMacroNames;
    protected $importedSymbols;
    protected $traits;
    protected $embeddedTemplates = array();

    /**
     * Constructor.
     *
     * @param Twig_Environment $env A Twig_Environment instance
     */
    public function __construct(Twig_Environment $env)
    {
        $this->env = $env;
    }

    public function getEnvironment()
    {
        return $this->env;
    }

    public function getVarName()
    {
        return sprintf('__internal_%s', hash('sha256', uniqid(mt_rand(), true), false));
    }

    public function getFilename()
    {
        return $this->stream->getFilename();
    }

    /**
     * {@inheritdoc}
     */
    public function parse(Twig_TokenStream $stream, $test = null, $dropNeedle = false)
    {
        // push all variables into the stack to keep the current state of the parser
        $vars = get_object_vars($this);
        unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser']);
        $this->stack[] = $vars;

        // tag handlers
        if (null === $this->handlers) {
            $this->handlers = $this->env->getTokenParsers();
            $this->handlers->setParser($this);
        }

        // node visitors
        if (null === $this->visitors) {
            $this->visitors = $this->env->getNodeVisitors();
        }

        if (null === $this->expressionParser) {
            $this->expressionParser = new Twig_ExpressionParser($this, $this->env->getUnaryOperators(), $this->env->getBinaryOperators());
        }

        $this->stream = $stream;
        $this->parent = null;
        $this->blocks = array();
        $this->macros = array();
        $this->traits = array();
        $this->blockStack = array();
        $this->importedSymbols = array(array());
        $this->embeddedTemplates = array();

        try {
            $body = $this->subparse($test, $dropNeedle);

            if (null !== $this->parent) {
                if (null === $body = $this->filterBodyNodes($body)) {
                    $body = new Twig_Node();
                }
            }
        } catch (Twig_Error_Syntax $e) {
            if (!$e->getTemplateFile()) {
                $e->setTemplateFile($this->getFilename());
            }

            if (!$e->getTemplateLine()) {
                $e->setTemplateLine($this->stream->getCurrent()->getLine());
            }

            throw $e;
        }

        $node = new Twig_Node_Module(new Twig_Node_Body(array($body)), $this->parent, new Twig_Node($this->blocks), new Twig_Node($this->macros), new Twig_Node($this->traits), $this->embeddedTemplates, $this->getFilename());

        $traverser = new Twig_NodeTraverser($this->env, $this->visitors);

        $node = $traverser->traverse($node);

        // restore previous stack so previous parse() call can resume working
        foreach (array_pop($this->stack) as $key => $val) {
            $this->$key = $val;
        }

        return $node;
    }

    public function subparse($test, $dropNeedle = false)
    {
        $lineno = $this->getCurrentToken()->getLine();
        $rv = array();
        while (!$this->stream->isEOF()) {
            switch ($this->getCurrentToken()->getType()) {
                case Twig_Token::TEXT_TYPE:
                    $token = $this->stream->next();
                    $rv[] = new Twig_Node_Text($token->getValue(), $token->getLine());
                    break;

                case Twig_Token::VAR_START_TYPE:
                    $token = $this->stream->next();
                    $expr = $this->expressionParser->parseExpression();
                    $this->stream->expect(Twig_Token::VAR_END_TYPE);
                    $rv[] = new Twig_Node_Print($expr, $token->getLine());
                    break;

                case Twig_Token::BLOCK_START_TYPE:
                    $this->stream->next();
                    $token = $this->getCurrentToken();

                    if ($token->getType() !== Twig_Token::NAME_TYPE) {
                        throw new Twig_Error_Syntax('A block must start with a tag name', $token->getLine(), $this->getFilename());
                    }

                    if (null !== $test && call_user_func($test, $token)) {
                        if ($dropNeedle) {
                            $this->stream->next();
                        }

                        if (1 === count($rv)) {
                            return $rv[0];
                        }

                        return new Twig_Node($rv, array(), $lineno);
                    }

                    $subparser = $this->handlers->getTokenParser($token->getValue());
                    if (null === $subparser) {
                        if (null !== $test) {
                            $error = sprintf('Unexpected tag name "%s"', $token->getValue());
                            if (is_array($test) && isset($test[0]) && $test[0] instanceof Twig_TokenParserInterface) {
                                $error .= sprintf(' (expecting closing tag for the "%s" tag defined near line %s)', $test[0]->getTag(), $lineno);
                            }

                            throw new Twig_Error_Syntax($error, $token->getLine(), $this->getFilename());
                        }

                        $message = sprintf('Unknown tag name "%s"', $token->getValue());
                        if ($alternatives = $this->env->computeAlternatives($token->getValue(), array_keys($this->env->getTags()))) {
                            $message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
                        }

                        throw new Twig_Error_Syntax($message, $token->getLine(), $this->getFilename());
                    }

                    $this->stream->next();

                    $node = $subparser->parse($token);
                    if (null !== $node) {
                        $rv[] = $node;
                    }
                    break;

                default:
                    throw new Twig_Error_Syntax('Lexer or parser ended up in unsupported state.', 0, $this->getFilename());
            }
        }

        if (1 === count($rv)) {
            return $rv[0];
        }

        return new Twig_Node($rv, array(), $lineno);
    }

    public function addHandler($name, $class)
    {
        $this->handlers[$name] = $class;
    }

    public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
    {
        $this->visitors[] = $visitor;
    }

    public function getBlockStack()
    {
        return $this->blockStack;
    }

    public function peekBlockStack()
    {
        return $this->blockStack[count($this->blockStack) - 1];
    }

    public function popBlockStack()
    {
        array_pop($this->blockStack);
    }

    public function pushBlockStack($name)
    {
        $this->blockStack[] = $name;
    }

    public function hasBlock($name)
    {
        return isset($this->blocks[$name]);
    }

    public function getBlock($name)
    {
        return $this->blocks[$name];
    }

    public function setBlock($name, Twig_Node_Block $value)
    {
        $this->blocks[$name] = new Twig_Node_Body(array($value), array(), $value->getLine());
    }

    public function hasMacro($name)
    {
        return isset($this->macros[$name]);
    }

    public function setMacro($name, Twig_Node_Macro $node)
    {
        if ($this->isReservedMacroName($name)) {
            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());
        }

        $this->macros[$name] = $node;
    }

    public function isReservedMacroName($name)
    {
        if (null === $this->reservedMacroNames) {
            $this->reservedMacroNames = array();
            $r = new ReflectionClass($this->env->getBaseTemplateClass());
            foreach ($r->getMethods() as $method) {
                $methodName = strtolower($method->getName());

                if ('get' === substr($methodName, 0, 3) && isset($methodName[3])) {
                    $this->reservedMacroNames[] = substr($methodName, 3);
                }
            }
        }

        return in_array(strtolower($name), $this->reservedMacroNames);
    }

    public function addTrait($trait)
    {
        $this->traits[] = $trait;
    }

    public function hasTraits()
    {
        return count($this->traits) > 0;
    }

    public function embedTemplate(Twig_Node_Module $template)
    {
        $template->setIndex(mt_rand());

        $this->embeddedTemplates[] = $template;
    }

    public function addImportedSymbol($type, $alias, $name = null, Twig_Node_Expression $node = null)
    {
        $this->importedSymbols[0][$type][$alias] = array('name' => $name, 'node' => $node);
    }

    public function getImportedSymbol($type, $alias)
    {
        foreach ($this->importedSymbols as $functions) {
            if (isset($functions[$type][$alias])) {
                return $functions[$type][$alias];
            }
        }
    }

    public function isMainScope()
    {
        return 1 === count($this->importedSymbols);
    }

    public function pushLocalScope()
    {
        array_unshift($this->importedSymbols, array());
    }

    public function popLocalScope()
    {
        array_shift($this->importedSymbols);
    }

    /**
     * Gets the expression parser.
     *
     * @return Twig_ExpressionParser The expression parser
     */
    public function getExpressionParser()
    {
        return $this->expressionParser;
    }

    public function getParent()
    {
        return $this->parent;
    }

    public function setParent($parent)
    {
        $this->parent = $parent;
    }

    /**
     * Gets the token stream.
     *
     * @return Twig_TokenStream The token stream
     */
    public function getStream()
    {
        return $this->stream;
    }

    /**
     * Gets the current token.
     *
     * @return Twig_Token The current token
     */
    public function getCurrentToken()
    {
        return $this->stream->getCurrent();
    }

    protected function filterBodyNodes(Twig_NodeInterface $node)
    {
        // check that the body does not contain non-empty output nodes
        if (
            ($node instanceof Twig_Node_Text && !ctype_space($node->getAttribute('data')))
            ||
            (!$node instanceof Twig_Node_Text && !$node instanceof Twig_Node_BlockReference && $node instanceof Twig_NodeOutputInterface)
        ) {
            if (false !== strpos((string) $node, chr(0xEF).chr(0xBB).chr(0xBF))) {
                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());
            }

            throw new Twig_Error_Syntax('A template that extends another one cannot have a body.', $node->getLine(), $this->getFilename());
        }

        // bypass "set" nodes as they "capture" the output
        if ($node instanceof Twig_Node_Set) {
            return $node;
        }

        if ($node instanceof Twig_NodeOutputInterface) {
            return;
        }

        foreach ($node as $k => $n) {
            if (null !== $n && null === $this->filterBodyNodes($n)) {
                $node->removeNode($k);
            }
        }

        return $node;
    }
}