Start working
Modified some paths to be more generic and not require rewrite. Some instances of phase names have been changed, others are still in process.
This commit is contained in:
mattbk
645
Twig/ExpressionParser.php
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645
Twig/ExpressionParser.php
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@ -0,0 +1,645 @@
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<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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* (c) 2009 Armin Ronacher
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Parses expressions.
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*
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* This parser implements a "Precedence climbing" algorithm.
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*
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* @see http://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
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* @see http://en.wikipedia.org/wiki/Operator-precedence_parser
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_ExpressionParser
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{
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const OPERATOR_LEFT = 1;
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const OPERATOR_RIGHT = 2;
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protected $parser;
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protected $unaryOperators;
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protected $binaryOperators;
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public function __construct(Twig_Parser $parser, array $unaryOperators, array $binaryOperators)
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{
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$this->parser = $parser;
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$this->unaryOperators = $unaryOperators;
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$this->binaryOperators = $binaryOperators;
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}
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public function parseExpression($precedence = 0)
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{
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$expr = $this->getPrimary();
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$token = $this->parser->getCurrentToken();
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while ($this->isBinary($token) && $this->binaryOperators[$token->getValue()]['precedence'] >= $precedence) {
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$op = $this->binaryOperators[$token->getValue()];
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$this->parser->getStream()->next();
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if (isset($op['callable'])) {
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$expr = call_user_func($op['callable'], $this->parser, $expr);
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} else {
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$expr1 = $this->parseExpression(self::OPERATOR_LEFT === $op['associativity'] ? $op['precedence'] + 1 : $op['precedence']);
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$class = $op['class'];
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$expr = new $class($expr, $expr1, $token->getLine());
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}
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$token = $this->parser->getCurrentToken();
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}
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if (0 === $precedence) {
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return $this->parseConditionalExpression($expr);
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}
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return $expr;
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}
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protected function getPrimary()
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{
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$token = $this->parser->getCurrentToken();
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if ($this->isUnary($token)) {
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$operator = $this->unaryOperators[$token->getValue()];
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$this->parser->getStream()->next();
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$expr = $this->parseExpression($operator['precedence']);
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$class = $operator['class'];
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return $this->parsePostfixExpression(new $class($expr, $token->getLine()));
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} elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
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$this->parser->getStream()->next();
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$expr = $this->parseExpression();
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$this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'An opened parenthesis is not properly closed');
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return $this->parsePostfixExpression($expr);
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}
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return $this->parsePrimaryExpression();
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}
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protected function parseConditionalExpression($expr)
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{
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while ($this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, '?')) {
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if (!$this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, ':')) {
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$expr2 = $this->parseExpression();
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if ($this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, ':')) {
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$expr3 = $this->parseExpression();
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} else {
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$expr3 = new Twig_Node_Expression_Constant('', $this->parser->getCurrentToken()->getLine());
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}
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} else {
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$expr2 = $expr;
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$expr3 = $this->parseExpression();
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}
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$expr = new Twig_Node_Expression_Conditional($expr, $expr2, $expr3, $this->parser->getCurrentToken()->getLine());
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}
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return $expr;
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}
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protected function isUnary(Twig_Token $token)
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{
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return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->unaryOperators[$token->getValue()]);
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}
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protected function isBinary(Twig_Token $token)
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{
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return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->binaryOperators[$token->getValue()]);
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}
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public function parsePrimaryExpression()
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{
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$token = $this->parser->getCurrentToken();
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switch ($token->getType()) {
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case Twig_Token::NAME_TYPE:
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$this->parser->getStream()->next();
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switch ($token->getValue()) {
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case 'true':
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case 'TRUE':
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$node = new Twig_Node_Expression_Constant(true, $token->getLine());
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break;
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case 'false':
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case 'FALSE':
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$node = new Twig_Node_Expression_Constant(false, $token->getLine());
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break;
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case 'none':
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case 'NONE':
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case 'null':
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case 'NULL':
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$node = new Twig_Node_Expression_Constant(null, $token->getLine());
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break;
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default:
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if ('(' === $this->parser->getCurrentToken()->getValue()) {
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$node = $this->getFunctionNode($token->getValue(), $token->getLine());
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} else {
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$node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
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}
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}
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break;
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case Twig_Token::NUMBER_TYPE:
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$this->parser->getStream()->next();
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$node = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
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break;
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case Twig_Token::STRING_TYPE:
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case Twig_Token::INTERPOLATION_START_TYPE:
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$node = $this->parseStringExpression();
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break;
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case Twig_Token::OPERATOR_TYPE:
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if (preg_match(Twig_Lexer::REGEX_NAME, $token->getValue(), $matches) && $matches[0] == $token->getValue()) {
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// in this context, string operators are variable names
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$this->parser->getStream()->next();
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$node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
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break;
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} elseif (isset($this->unaryOperators[$token->getValue()])) {
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$class = $this->unaryOperators[$token->getValue()]['class'];
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$ref = new ReflectionClass($class);
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$negClass = 'Twig_Node_Expression_Unary_Neg';
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$posClass = 'Twig_Node_Expression_Unary_Pos';
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if (!(in_array($ref->getName(), array($negClass, $posClass)) || $ref->isSubclassOf($negClass) || $ref->isSubclassOf($posClass))) {
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throw new Twig_Error_Syntax(sprintf('Unexpected unary operator "%s"', $token->getValue()), $token->getLine(), $this->parser->getFilename());
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}
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$this->parser->getStream()->next();
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$expr = $this->parsePrimaryExpression();
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$node = new $class($expr, $token->getLine());
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break;
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}
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default:
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if ($token->test(Twig_Token::PUNCTUATION_TYPE, '[')) {
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$node = $this->parseArrayExpression();
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} elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '{')) {
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$node = $this->parseHashExpression();
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} else {
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throw new Twig_Error_Syntax(sprintf('Unexpected token "%s" of value "%s"', Twig_Token::typeToEnglish($token->getType()), $token->getValue()), $token->getLine(), $this->parser->getFilename());
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}
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}
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return $this->parsePostfixExpression($node);
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}
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public function parseStringExpression()
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{
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$stream = $this->parser->getStream();
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$nodes = array();
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// a string cannot be followed by another string in a single expression
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$nextCanBeString = true;
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while (true) {
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if ($nextCanBeString && $token = $stream->nextIf(Twig_Token::STRING_TYPE)) {
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$nodes[] = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
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$nextCanBeString = false;
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} elseif ($stream->nextIf(Twig_Token::INTERPOLATION_START_TYPE)) {
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$nodes[] = $this->parseExpression();
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$stream->expect(Twig_Token::INTERPOLATION_END_TYPE);
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$nextCanBeString = true;
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} else {
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break;
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}
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}
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$expr = array_shift($nodes);
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foreach ($nodes as $node) {
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$expr = new Twig_Node_Expression_Binary_Concat($expr, $node, $node->getLine());
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}
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return $expr;
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}
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public function parseArrayExpression()
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{
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$stream = $this->parser->getStream();
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$stream->expect(Twig_Token::PUNCTUATION_TYPE, '[', 'An array element was expected');
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$node = new Twig_Node_Expression_Array(array(), $stream->getCurrent()->getLine());
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$first = true;
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while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
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if (!$first) {
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$stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'An array element must be followed by a comma');
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// trailing ,?
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if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
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break;
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}
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}
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$first = false;
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$node->addElement($this->parseExpression());
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}
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$stream->expect(Twig_Token::PUNCTUATION_TYPE, ']', 'An opened array is not properly closed');
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return $node;
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}
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public function parseHashExpression()
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{
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$stream = $this->parser->getStream();
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$stream->expect(Twig_Token::PUNCTUATION_TYPE, '{', 'A hash element was expected');
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$node = new Twig_Node_Expression_Array(array(), $stream->getCurrent()->getLine());
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$first = true;
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while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
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if (!$first) {
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$stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'A hash value must be followed by a comma');
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// trailing ,?
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if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
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break;
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}
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}
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$first = false;
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// a hash key can be:
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//
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// * a number -- 12
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// * a string -- 'a'
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// * a name, which is equivalent to a string -- a
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// * an expression, which must be enclosed in parentheses -- (1 + 2)
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if (($token = $stream->nextIf(Twig_Token::STRING_TYPE)) || ($token = $stream->nextIf(Twig_Token::NAME_TYPE)) || $token = $stream->nextIf(Twig_Token::NUMBER_TYPE)) {
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$key = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
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} elseif ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
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$key = $this->parseExpression();
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} else {
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$current = $stream->getCurrent();
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throw new Twig_Error_Syntax(sprintf('A hash key must be a quoted string, a number, a name, or an expression enclosed in parentheses (unexpected token "%s" of value "%s"', Twig_Token::typeToEnglish($current->getType()), $current->getValue()), $current->getLine(), $this->parser->getFilename());
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}
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$stream->expect(Twig_Token::PUNCTUATION_TYPE, ':', 'A hash key must be followed by a colon (:)');
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$value = $this->parseExpression();
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$node->addElement($value, $key);
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}
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$stream->expect(Twig_Token::PUNCTUATION_TYPE, '}', 'An opened hash is not properly closed');
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return $node;
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}
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public function parsePostfixExpression($node)
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{
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while (true) {
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$token = $this->parser->getCurrentToken();
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if ($token->getType() == Twig_Token::PUNCTUATION_TYPE) {
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if ('.' == $token->getValue() || '[' == $token->getValue()) {
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$node = $this->parseSubscriptExpression($node);
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} elseif ('|' == $token->getValue()) {
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$node = $this->parseFilterExpression($node);
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} else {
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break;
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}
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} else {
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break;
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}
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}
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return $node;
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}
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public function getFunctionNode($name, $line)
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{
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switch ($name) {
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case 'parent':
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$this->parseArguments();
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if (!count($this->parser->getBlockStack())) {
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throw new Twig_Error_Syntax('Calling "parent" outside a block is forbidden', $line, $this->parser->getFilename());
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}
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if (!$this->parser->getParent() && !$this->parser->hasTraits()) {
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throw new Twig_Error_Syntax('Calling "parent" on a template that does not extend nor "use" another template is forbidden', $line, $this->parser->getFilename());
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}
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return new Twig_Node_Expression_Parent($this->parser->peekBlockStack(), $line);
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case 'block':
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return new Twig_Node_Expression_BlockReference($this->parseArguments()->getNode(0), false, $line);
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case 'attribute':
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$args = $this->parseArguments();
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if (count($args) < 2) {
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throw new Twig_Error_Syntax('The "attribute" function takes at least two arguments (the variable and the attributes)', $line, $this->parser->getFilename());
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}
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return new Twig_Node_Expression_GetAttr($args->getNode(0), $args->getNode(1), count($args) > 2 ? $args->getNode(2) : null, Twig_Template::ANY_CALL, $line);
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default:
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if (null !== $alias = $this->parser->getImportedSymbol('function', $name)) {
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$arguments = new Twig_Node_Expression_Array(array(), $line);
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foreach ($this->parseArguments() as $n) {
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$arguments->addElement($n);
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}
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$node = new Twig_Node_Expression_MethodCall($alias['node'], $alias['name'], $arguments, $line);
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$node->setAttribute('safe', true);
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return $node;
|
||||
}
|
||||
|
||||
$args = $this->parseArguments(true);
|
||||
$class = $this->getFunctionNodeClass($name, $line);
|
||||
|
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return new $class($name, $args, $line);
|
||||
}
|
||||
}
|
||||
|
||||
public function parseSubscriptExpression($node)
|
||||
{
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||||
$stream = $this->parser->getStream();
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$token = $stream->next();
|
||||
$lineno = $token->getLine();
|
||||
$arguments = new Twig_Node_Expression_Array(array(), $lineno);
|
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$type = Twig_Template::ANY_CALL;
|
||||
if ($token->getValue() == '.') {
|
||||
$token = $stream->next();
|
||||
if (
|
||||
$token->getType() == Twig_Token::NAME_TYPE
|
||||
||
|
||||
$token->getType() == Twig_Token::NUMBER_TYPE
|
||||
||
|
||||
($token->getType() == Twig_Token::OPERATOR_TYPE && preg_match(Twig_Lexer::REGEX_NAME, $token->getValue()))
|
||||
) {
|
||||
$arg = new Twig_Node_Expression_Constant($token->getValue(), $lineno);
|
||||
|
||||
if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
|
||||
$type = Twig_TemplateInterface::METHOD_CALL;
|
||||
foreach ($this->parseArguments() as $n) {
|
||||
$arguments->addElement($n);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
throw new Twig_Error_Syntax('Expected name or number', $lineno, $this->parser->getFilename());
|
||||
}
|
||||
|
||||
if ($node instanceof Twig_Node_Expression_Name && null !== $this->parser->getImportedSymbol('template', $node->getAttribute('name'))) {
|
||||
if (!$arg instanceof Twig_Node_Expression_Constant) {
|
||||
throw new Twig_Error_Syntax(sprintf('Dynamic macro names are not supported (called on "%s")', $node->getAttribute('name')), $token->getLine(), $this->parser->getFilename());
|
||||
}
|
||||
|
||||
$name = $arg->getAttribute('value');
|
||||
|
||||
if ($this->parser->isReservedMacroName($name)) {
|
||||
throw new Twig_Error_Syntax(sprintf('"%s" cannot be called as macro as it is a reserved keyword', $name), $token->getLine(), $this->parser->getFilename());
|
||||
}
|
||||
|
||||
$node = new Twig_Node_Expression_MethodCall($node, 'get'.$name, $arguments, $lineno);
|
||||
$node->setAttribute('safe', true);
|
||||
|
||||
return $node;
|
||||
}
|
||||
} else {
|
||||
$type = Twig_Template::ARRAY_CALL;
|
||||
|
||||
// slice?
|
||||
$slice = false;
|
||||
if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ':')) {
|
||||
$slice = true;
|
||||
$arg = new Twig_Node_Expression_Constant(0, $token->getLine());
|
||||
} else {
|
||||
$arg = $this->parseExpression();
|
||||
}
|
||||
|
||||
if ($stream->nextIf(Twig_Token::PUNCTUATION_TYPE, ':')) {
|
||||
$slice = true;
|
||||
}
|
||||
|
||||
if ($slice) {
|
||||
if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
|
||||
$length = new Twig_Node_Expression_Constant(null, $token->getLine());
|
||||
} else {
|
||||
$length = $this->parseExpression();
|
||||
}
|
||||
|
||||
$class = $this->getFilterNodeClass('slice', $token->getLine());
|
||||
$arguments = new Twig_Node(array($arg, $length));
|
||||
$filter = new $class($node, new Twig_Node_Expression_Constant('slice', $token->getLine()), $arguments, $token->getLine());
|
||||
|
||||
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ']');
|
||||
|
||||
return $filter;
|
||||
}
|
||||
|
||||
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ']');
|
||||
}
|
||||
|
||||
return new Twig_Node_Expression_GetAttr($node, $arg, $arguments, $type, $lineno);
|
||||
}
|
||||
|
||||
public function parseFilterExpression($node)
|
||||
{
|
||||
$this->parser->getStream()->next();
|
||||
|
||||
return $this->parseFilterExpressionRaw($node);
|
||||
}
|
||||
|
||||
public function parseFilterExpressionRaw($node, $tag = null)
|
||||
{
|
||||
while (true) {
|
||||
$token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE);
|
||||
|
||||
$name = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
|
||||
if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
|
||||
$arguments = new Twig_Node();
|
||||
} else {
|
||||
$arguments = $this->parseArguments(true);
|
||||
}
|
||||
|
||||
$class = $this->getFilterNodeClass($name->getAttribute('value'), $token->getLine());
|
||||
|
||||
$node = new $class($node, $name, $arguments, $token->getLine(), $tag);
|
||||
|
||||
if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '|')) {
|
||||
break;
|
||||
}
|
||||
|
||||
$this->parser->getStream()->next();
|
||||
}
|
||||
|
||||
return $node;
|
||||
}
|
||||
|
||||
/**
|
||||
* Parses arguments.
|
||||
*
|
||||
* @param bool $namedArguments Whether to allow named arguments or not
|
||||
* @param bool $definition Whether we are parsing arguments for a function definition
|
||||
*
|
||||
* @return Twig_Node
|
||||
*
|
||||
* @throws Twig_Error_Syntax
|
||||
*/
|
||||
public function parseArguments($namedArguments = false, $definition = false)
|
||||
{
|
||||
$args = array();
|
||||
$stream = $this->parser->getStream();
|
||||
|
||||
$stream->expect(Twig_Token::PUNCTUATION_TYPE, '(', 'A list of arguments must begin with an opening parenthesis');
|
||||
while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ')')) {
|
||||
if (!empty($args)) {
|
||||
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'Arguments must be separated by a comma');
|
||||
}
|
||||
|
||||
if ($definition) {
|
||||
$token = $stream->expect(Twig_Token::NAME_TYPE, null, 'An argument must be a name');
|
||||
$value = new Twig_Node_Expression_Name($token->getValue(), $this->parser->getCurrentToken()->getLine());
|
||||
} else {
|
||||
$value = $this->parseExpression();
|
||||
}
|
||||
|
||||
$name = null;
|
||||
if ($namedArguments && $token = $stream->nextIf(Twig_Token::OPERATOR_TYPE, '=')) {
|
||||
if (!$value instanceof Twig_Node_Expression_Name) {
|
||||
throw new Twig_Error_Syntax(sprintf('A parameter name must be a string, "%s" given', get_class($value)), $token->getLine(), $this->parser->getFilename());
|
||||
}
|
||||
$name = $value->getAttribute('name');
|
||||
|
||||
if ($definition) {
|
||||
$value = $this->parsePrimaryExpression();
|
||||
|
||||
if (!$this->checkConstantExpression($value)) {
|
||||
throw new Twig_Error_Syntax(sprintf('A default value for an argument must be a constant (a boolean, a string, a number, or an array).'), $token->getLine(), $this->parser->getFilename());
|
||||
}
|
||||
} else {
|
||||
$value = $this->parseExpression();
|
||||
}
|
||||
}
|
||||
|
||||
if ($definition) {
|
||||
if (null === $name) {
|
||||
$name = $value->getAttribute('name');
|
||||
$value = new Twig_Node_Expression_Constant(null, $this->parser->getCurrentToken()->getLine());
|
||||
}
|
||||
$args[$name] = $value;
|
||||
} else {
|
||||
if (null === $name) {
|
||||
$args[] = $value;
|
||||
} else {
|
||||
$args[$name] = $value;
|
||||
}
|
||||
}
|
||||
}
|
||||
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'A list of arguments must be closed by a parenthesis');
|
||||
|
||||
return new Twig_Node($args);
|
||||
}
|
||||
|
||||
public function parseAssignmentExpression()
|
||||
{
|
||||
$targets = array();
|
||||
while (true) {
|
||||
$token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE, null, 'Only variables can be assigned to');
|
||||
if (in_array($token->getValue(), array('true', 'false', 'none'))) {
|
||||
throw new Twig_Error_Syntax(sprintf('You cannot assign a value to "%s"', $token->getValue()), $token->getLine(), $this->parser->getFilename());
|
||||
}
|
||||
$targets[] = new Twig_Node_Expression_AssignName($token->getValue(), $token->getLine());
|
||||
|
||||
if (!$this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, ',')) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return new Twig_Node($targets);
|
||||
}
|
||||
|
||||
public function parseMultitargetExpression()
|
||||
{
|
||||
$targets = array();
|
||||
while (true) {
|
||||
$targets[] = $this->parseExpression();
|
||||
if (!$this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, ',')) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return new Twig_Node($targets);
|
||||
}
|
||||
|
||||
protected function getFunctionNodeClass($name, $line)
|
||||
{
|
||||
$env = $this->parser->getEnvironment();
|
||||
|
||||
if (false === $function = $env->getFunction($name)) {
|
||||
$message = sprintf('The function "%s" does not exist', $name);
|
||||
if ($alternatives = $env->computeAlternatives($name, array_keys($env->getFunctions()))) {
|
||||
$message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
|
||||
}
|
||||
|
||||
throw new Twig_Error_Syntax($message, $line, $this->parser->getFilename());
|
||||
}
|
||||
|
||||
if ($function instanceof Twig_SimpleFunction && $function->isDeprecated()) {
|
||||
$message = sprintf('Twig Function "%s" is deprecated', $function->getName());
|
||||
if ($function->getAlternative()) {
|
||||
$message .= sprintf('. Use "%s" instead', $function->getAlternative());
|
||||
}
|
||||
$message .= sprintf(' in %s at line %d.', $this->parser->getFilename(), $line);
|
||||
|
||||
@trigger_error($message, E_USER_DEPRECATED);
|
||||
}
|
||||
|
||||
if ($function instanceof Twig_SimpleFunction) {
|
||||
return $function->getNodeClass();
|
||||
}
|
||||
|
||||
return $function instanceof Twig_Function_Node ? $function->getClass() : 'Twig_Node_Expression_Function';
|
||||
}
|
||||
|
||||
protected function getFilterNodeClass($name, $line)
|
||||
{
|
||||
$env = $this->parser->getEnvironment();
|
||||
|
||||
if (false === $filter = $env->getFilter($name)) {
|
||||
$message = sprintf('The filter "%s" does not exist', $name);
|
||||
if ($alternatives = $env->computeAlternatives($name, array_keys($env->getFilters()))) {
|
||||
$message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
|
||||
}
|
||||
|
||||
throw new Twig_Error_Syntax($message, $line, $this->parser->getFilename());
|
||||
}
|
||||
|
||||
if ($filter instanceof Twig_SimpleFilter && $filter->isDeprecated()) {
|
||||
$message = sprintf('Twig Filter "%s" is deprecated', $filter->getName());
|
||||
if ($filter->getAlternative()) {
|
||||
$message .= sprintf('. Use "%s" instead', $filter->getAlternative());
|
||||
}
|
||||
$message .= sprintf(' in %s at line %d.', $this->parser->getFilename(), $line);
|
||||
|
||||
@trigger_error($message, E_USER_DEPRECATED);
|
||||
}
|
||||
|
||||
if ($filter instanceof Twig_SimpleFilter) {
|
||||
return $filter->getNodeClass();
|
||||
}
|
||||
|
||||
return $filter instanceof Twig_Filter_Node ? $filter->getClass() : 'Twig_Node_Expression_Filter';
|
||||
}
|
||||
|
||||
// checks that the node only contains "constant" elements
|
||||
protected function checkConstantExpression(Twig_NodeInterface $node)
|
||||
{
|
||||
if (!($node instanceof Twig_Node_Expression_Constant || $node instanceof Twig_Node_Expression_Array
|
||||
|| $node instanceof Twig_Node_Expression_Unary_Neg || $node instanceof Twig_Node_Expression_Unary_Pos
|
||||
)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
foreach ($node as $n) {
|
||||
if (!$this->checkConstantExpression($n)) {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user