<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
* (c) Armin Ronacher
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Parses expressions.
*
* This parser implements a "Precedence climbing" algorithm.
*
* @see https://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
* @see https://en.wikipedia.org/wiki/Operator-precedence_parser
*
* @author Fabien Potencier < fabien @ symfony . com >
*
* @internal
*/
class Twig_ExpressionParser
{
const OPERATOR_LEFT = 1;
const OPERATOR_RIGHT = 2;
private $parser;
private $env;
private $unaryOperators;
private $binaryOperators;
public function __construct(Twig_Parser $parser, Twig_Environment $env)
{
$this->parser = $parser;
$this->env = $env;
$this->unaryOperators = $env->getUnaryOperators();
$this->binaryOperators = $env->getBinaryOperators();
}
public function parseExpression($precedence = 0)
{
$expr = $this->getPrimary();
$token = $this->parser->getCurrentToken();
while ($this->isBinary($token) & & $this->binaryOperators[$token->getValue()]['precedence'] >= $precedence) {
$op = $this->binaryOperators[$token->getValue()];
$this->parser->getStream()->next();
if ('is not' === $token->getValue()) {
$expr = $this->parseNotTestExpression($expr);
} elseif ('is' === $token->getValue()) {
$expr = $this->parseTestExpression($expr);
} elseif (isset($op['callable'])) {
$expr = $op['callable']($this->parser, $expr);
} else {
$expr1 = $this->parseExpression(self::OPERATOR_LEFT === $op['associativity'] ? $op['precedence'] + 1 : $op['precedence']);
$class = $op['class'];
$expr = new $class($expr, $expr1, $token->getLine());
}
$token = $this->parser->getCurrentToken();
}
if (0 === $precedence) {
return $this->parseConditionalExpression($expr);
}
return $expr;
}
private function getPrimary()
{
$token = $this->parser->getCurrentToken();
if ($this->isUnary($token)) {
$operator = $this->unaryOperators[$token->getValue()];
$this->parser->getStream()->next();
$expr = $this->parseExpression($operator['precedence']);
$class = $operator['class'];
return $this->parsePostfixExpression(new $class($expr, $token->getLine()));
} elseif ($token->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '(')) {
$this->parser->getStream()->next();
$expr = $this->parseExpression();
$this->parser->getStream()->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ')', 'An opened parenthesis is not properly closed');
return $this->parsePostfixExpression($expr);
}
return $this->parsePrimaryExpression();
}
private function parseConditionalExpression($expr)
{
while ($this->parser->getStream()->nextIf(/* Twig_Token::PUNCTUATION_TYPE */ 9, '?')) {
if (!$this->parser->getStream()->nextIf(/* Twig_Token::PUNCTUATION_TYPE */ 9, ':')) {
$expr2 = $this->parseExpression();
if ($this->parser->getStream()->nextIf(/* Twig_Token::PUNCTUATION_TYPE */ 9, ':')) {
$expr3 = $this->parseExpression();
} else {
$expr3 = new Twig_Node_Expression_Constant('', $this->parser->getCurrentToken()->getLine());
}
} else {
$expr2 = $expr;
$expr3 = $this->parseExpression();
}
$expr = new Twig_Node_Expression_Conditional($expr, $expr2, $expr3, $this->parser->getCurrentToken()->getLine());
}
return $expr;
}
private function isUnary(Twig_Token $token)
{
return $token->test(/* Twig_Token::OPERATOR_TYPE */ 8) & & isset($this->unaryOperators[$token->getValue()]);
}
private function isBinary(Twig_Token $token)
{
return $token->test(/* Twig_Token::OPERATOR_TYPE */ 8) & & isset($this->binaryOperators[$token->getValue()]);
}
public function parsePrimaryExpression()
{
$token = $this->parser->getCurrentToken();
switch ($token->getType()) {
case /* Twig_Token::NAME_TYPE */ 5:
$this->parser->getStream()->next();
switch ($token->getValue()) {
case 'true':
case 'TRUE':
$node = new Twig_Node_Expression_Constant(true, $token->getLine());
break;
case 'false':
case 'FALSE':
$node = new Twig_Node_Expression_Constant(false, $token->getLine());
break;
case 'none':
case 'NONE':
case 'null':
case 'NULL':
$node = new Twig_Node_Expression_Constant(null, $token->getLine());
break;
default:
if ('(' === $this->parser->getCurrentToken()->getValue()) {
$node = $this->getFunctionNode($token->getValue(), $token->getLine());
} else {
$node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
}
}
break;
case /* Twig_Token::NUMBER_TYPE */ 6:
$this->parser->getStream()->next();
$node = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
break;
case /* Twig_Token::STRING_TYPE */ 7:
case /* Twig_Token::INTERPOLATION_START_TYPE */ 10:
$node = $this->parseStringExpression();
break;
case /* Twig_Token::OPERATOR_TYPE */ 8:
if (preg_match(Twig_Lexer::REGEX_NAME, $token->getValue(), $matches) & & $matches[0] == $token->getValue()) {
// in this context, string operators are variable names
$this->parser->getStream()->next();
$node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
break;
} elseif (isset($this->unaryOperators[$token->getValue()])) {
$class = $this->unaryOperators[$token->getValue()]['class'];
$ref = new ReflectionClass($class);
$negClass = 'Twig_Node_Expression_Unary_Neg';
$posClass = 'Twig_Node_Expression_Unary_Pos';
if (!(in_array($ref->getName(), [$negClass, $posClass]) || $ref->isSubclassOf($negClass) || $ref->isSubclassOf($posClass))) {
throw new Twig_Error_Syntax(sprintf('Unexpected unary operator "%s".', $token->getValue()), $token->getLine(), $this->parser->getStream()->getSourceContext());
}
$this->parser->getStream()->next();
$expr = $this->parsePrimaryExpression();
$node = new $class($expr, $token->getLine());
break;
}
// no break
default:
if ($token->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '[')) {
$node = $this->parseArrayExpression();
} elseif ($token->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '{')) {
$node = $this->parseHashExpression();
} elseif ($token->test(/* Twig_Token::OPERATOR_TYPE */ 8, '=') & & ('==' === $this->parser->getStream()->look(-1)->getValue() || '!=' === $this->parser->getStream()->look(-1)->getValue())) {
throw new Twig_Error_Syntax(sprintf('Unexpected operator of value "%s". Did you try to use "===" or "!==" for strict comparison? Use "is same as(value)" instead.', $token->getValue()), $token->getLine(), $this->parser->getStream()->getSourceContext());
} else {
throw new Twig_Error_Syntax(sprintf('Unexpected token "%s" of value "%s".', Twig_Token::typeToEnglish($token->getType()), $token->getValue()), $token->getLine(), $this->parser->getStream()->getSourceContext());
}
}
return $this->parsePostfixExpression($node);
}
public function parseStringExpression()
{
$stream = $this->parser->getStream();
$nodes = [];
// a string cannot be followed by another string in a single expression
$nextCanBeString = true;
while (true) {
if ($nextCanBeString & & $token = $stream->nextIf(/* Twig_Token::STRING_TYPE */ 7)) {
$nodes[] = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
$nextCanBeString = false;
} elseif ($stream->nextIf(/* Twig_Token::INTERPOLATION_START_TYPE */ 10)) {
$nodes[] = $this->parseExpression();
$stream->expect(/* Twig_Token::INTERPOLATION_END_TYPE */ 11);
$nextCanBeString = true;
} else {
break;
}
}
$expr = array_shift($nodes);
foreach ($nodes as $node) {
$expr = new Twig_Node_Expression_Binary_Concat($expr, $node, $node->getTemplateLine());
}
return $expr;
}
public function parseArrayExpression()
{
$stream = $this->parser->getStream();
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, '[', 'An array element was expected');
$node = new Twig_Node_Expression_Array([], $stream->getCurrent()->getLine());
$first = true;
while (!$stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, ']')) {
if (!$first) {
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ',', 'An array element must be followed by a comma');
// trailing ,?
if ($stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, ']')) {
break;
}
}
$first = false;
$node->addElement($this->parseExpression());
}
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ']', 'An opened array is not properly closed');
return $node;
}
public function parseHashExpression()
{
$stream = $this->parser->getStream();
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, '{', 'A hash element was expected');
$node = new Twig_Node_Expression_Array([], $stream->getCurrent()->getLine());
$first = true;
while (!$stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '}')) {
if (!$first) {
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ',', 'A hash value must be followed by a comma');
// trailing ,?
if ($stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '}')) {
break;
}
}
$first = false;
// a hash key can be:
//
// * a number -- 12
// * a string -- 'a'
// * a name, which is equivalent to a string -- a
// * an expression, which must be enclosed in parentheses -- (1 + 2)
if (($token = $stream->nextIf(/* Twig_Token::STRING_TYPE */ 7)) || ($token = $stream->nextIf(/* Twig_Token::NAME_TYPE */ 5)) || $token = $stream->nextIf(/* Twig_Token::NUMBER_TYPE */ 6)) {
$key = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
} elseif ($stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '(')) {
$key = $this->parseExpression();
} else {
$current = $stream->getCurrent();
throw new Twig_Error_Syntax(sprintf('A hash key must be a quoted string, a number, a name, or an expression enclosed in parentheses (unexpected token "%s" of value "%s".', Twig_Token::typeToEnglish($current->getType()), $current->getValue()), $current->getLine(), $stream->getSourceContext());
}
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ':', 'A hash key must be followed by a colon (:)');
$value = $this->parseExpression();
$node->addElement($value, $key);
}
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, '}', 'An opened hash is not properly closed');
return $node;
}
public function parsePostfixExpression($node)
{
while (true) {
$token = $this->parser->getCurrentToken();
if (/* Twig_Token::PUNCTUATION_TYPE */ 9 == $token->getType()) {
if ('.' == $token->getValue() || '[' == $token->getValue()) {
$node = $this->parseSubscriptExpression($node);
} elseif ('|' == $token->getValue()) {
$node = $this->parseFilterExpression($node);
} else {
break;
}
} else {
break;
}
}
return $node;
}
public function getFunctionNode($name, $line)
{
switch ($name) {
case 'parent':
$this->parseArguments();
if (!count($this->parser->getBlockStack())) {
throw new Twig_Error_Syntax('Calling "parent" outside a block is forbidden.', $line, $this->parser->getStream()->getSourceContext());
}
if (!$this->parser->getParent() & & !$this->parser->hasTraits()) {
throw new Twig_Error_Syntax('Calling "parent" on a template that does not extend nor "use" another template is forbidden.', $line, $this->parser->getStream()->getSourceContext());
}
return new Twig_Node_Expression_Parent($this->parser->peekBlockStack(), $line);
case 'block':
$args = $this->parseArguments();
if (count($args) < 1 ) {
throw new Twig_Error_Syntax('The "block" function takes one argument (the block name).', $line, $this->parser->getStream()->getSourceContext());
}
return new Twig_Node_Expression_BlockReference($args->getNode(0), count($args) > 1 ? $args->getNode(1) : null, $line);
case 'attribute':
$args = $this->parseArguments();
if (count($args) < 2 ) {
throw new Twig_Error_Syntax('The "attribute" function takes at least two arguments (the variable and the attributes).', $line, $this->parser->getStream()->getSourceContext());
}
return new Twig_Node_Expression_GetAttr($args->getNode(0), $args->getNode(1), count($args) > 2 ? $args->getNode(2) : null, Twig_Template::ANY_CALL, $line);
default:
if (null !== $alias = $this->parser->getImportedSymbol('function', $name)) {
$arguments = new Twig_Node_Expression_Array([], $line);
foreach ($this->parseArguments() as $n) {
$arguments->addElement($n);
}
$node = new Twig_Node_Expression_MethodCall($alias['node'], $alias['name'], $arguments, $line);
$node->setAttribute('safe', true);
return $node;
}
$args = $this->parseArguments(true);
$class = $this->getFunctionNodeClass($name, $line);
return new $class($name, $args, $line);
}
}
public function parseSubscriptExpression($node)
{
$stream = $this->parser->getStream();
$token = $stream->next();
$lineno = $token->getLine();
$arguments = new Twig_Node_Expression_Array([], $lineno);
$type = Twig_Template::ANY_CALL;
if ('.' == $token->getValue()) {
$token = $stream->next();
if (
/* Twig_Token::NAME_TYPE */ 5 == $token->getType()
||
/* Twig_Token::NUMBER_TYPE */ 6 == $token->getType()
||
(/* Twig_Token::OPERATOR_TYPE */ 8 == $token->getType() & & preg_match(Twig_Lexer::REGEX_NAME, $token->getValue()))
) {
$arg = new Twig_Node_Expression_Constant($token->getValue(), $lineno);
if ($stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '(')) {
$type = Twig_Template::METHOD_CALL;
foreach ($this->parseArguments() as $n) {
$arguments->addElement($n);
}
}
} else {
throw new Twig_Error_Syntax('Expected name or number.', $lineno, $stream->getSourceContext());
}
if ($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(), $stream->getSourceContext());
}
$name = $arg->getAttribute('value');
$node = new Twig_Node_Expression_MethodCall($node, 'macro_'.$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 */ 9, ':')) {
$slice = true;
$arg = new Twig_Node_Expression_Constant(0, $token->getLine());
} else {
$arg = $this->parseExpression();
}
if ($stream->nextIf(/* Twig_Token::PUNCTUATION_TYPE */ 9, ':')) {
$slice = true;
}
if ($slice) {
if ($stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, ']')) {
$length = new Twig_Node_Expression_Constant(null, $token->getLine());
} else {
$length = $this->parseExpression();
}
$class = $this->getFilterNodeClass('slice', $token->getLine());
$arguments = new Twig_Node([$arg, $length]);
$filter = new $class($node, new Twig_Node_Expression_Constant('slice', $token->getLine()), $arguments, $token->getLine());
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ']');
return $filter;
}
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ']');
}
return new Twig_Node_Expression_GetAttr($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 */ 5);
$name = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
if (!$this->parser->getStream()->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '(')) {
$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 */ 9, '|')) {
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 = [];
$stream = $this->parser->getStream();
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, '(', 'A list of arguments must begin with an opening parenthesis');
while (!$stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, ')')) {
if (!empty($args)) {
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ',', 'Arguments must be separated by a comma');
}
if ($definition) {
$token = $stream->expect(/* Twig_Token::NAME_TYPE */ 5, 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 = $stream->nextIf(/* Twig_Token::OPERATOR_TYPE */ 8, '=')) {
if (!$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(), $stream->getSourceContext());
}
$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(), $stream->getSourceContext());
}
} 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;
}
}
}
$stream->expect(/* Twig_Token::PUNCTUATION_TYPE */ 9, ')', 'A list of arguments must be closed by a parenthesis');
return new Twig_Node($args);
}
public function parseAssignmentExpression()
{
$stream = $this->parser->getStream();
$targets = [];
while (true) {
$token = $stream->expect(/* Twig_Token::NAME_TYPE */ 5, null, 'Only variables can be assigned to');
$value = $token->getValue();
if (in_array(strtolower($value), ['true', 'false', 'none', 'null'])) {
throw new Twig_Error_Syntax(sprintf('You cannot assign a value to "%s".', $value), $token->getLine(), $stream->getSourceContext());
}
$targets[] = new Twig_Node_Expression_AssignName($value, $token->getLine());
if (!$stream->nextIf(/* Twig_Token::PUNCTUATION_TYPE */ 9, ',')) {
break;
}
}
return new Twig_Node($targets);
}
public function parseMultitargetExpression()
{
$targets = [];
while (true) {
$targets[] = $this->parseExpression();
if (!$this->parser->getStream()->nextIf(/* Twig_Token::PUNCTUATION_TYPE */ 9, ',')) {
break;
}
}
return new Twig_Node($targets);
}
private function parseNotTestExpression(Twig_Node $node)
{
return new Twig_Node_Expression_Unary_Not($this->parseTestExpression($node), $this->parser->getCurrentToken()->getLine());
}
private function parseTestExpression(Twig_Node $node)
{
$stream = $this->parser->getStream();
list($name, $test) = $this->getTest($node->getTemplateLine());
$class = $this->getTestNodeClass($test);
$arguments = null;
if ($stream->test(/* Twig_Token::PUNCTUATION_TYPE */ 9, '(')) {
$arguments = $this->parser->getExpressionParser()->parseArguments(true);
}
return new $class($node, $name, $arguments, $this->parser->getCurrentToken()->getLine());
}
private function getTest($line)
{
$stream = $this->parser->getStream();
$name = $stream->expect(/* Twig_Token::NAME_TYPE */ 5)->getValue();
if ($test = $this->env->getTest($name)) {
return [$name, $test];
}
if ($stream->test(/* Twig_Token::NAME_TYPE */ 5)) {
// try 2-words tests
$name = $name.' '.$this->parser->getCurrentToken()->getValue();
if ($test = $this->env->getTest($name)) {
$stream->next();
return [$name, $test];
}
}
$e = new Twig_Error_Syntax(sprintf('Unknown "%s" test.', $name), $line, $stream->getSourceContext());
$e->addSuggestions($name, array_keys($this->env->getTests()));
throw $e;
}
private function getTestNodeClass($test)
{
if ($test->isDeprecated()) {
$stream = $this->parser->getStream();
$message = sprintf('Twig Test "%s" is deprecated', $test->getName());
if (!is_bool($test->getDeprecatedVersion())) {
$message .= sprintf(' since version %s', $test->getDeprecatedVersion());
}
if ($test->getAlternative()) {
$message .= sprintf('. Use "%s" instead', $test->getAlternative());
}
$src = $stream->getSourceContext();
$message .= sprintf(' in %s at line %d.', $src->getPath() ?: $src->getName(), $stream->getCurrent()->getLine());
@trigger_error($message, E_USER_DEPRECATED);
}
return $test->getNodeClass();
}
private function getFunctionNodeClass($name, $line)
{
if (false === $function = $this->env->getFunction($name)) {
$e = new Twig_Error_Syntax(sprintf('Unknown "%s" function.', $name), $line, $this->parser->getStream()->getSourceContext());
$e->addSuggestions($name, array_keys($this->env->getFunctions()));
throw $e;
}
if ($function->isDeprecated()) {
$message = sprintf('Twig Function "%s" is deprecated', $function->getName());
if (!is_bool($function->getDeprecatedVersion())) {
$message .= sprintf(' since version %s', $function->getDeprecatedVersion());
}
if ($function->getAlternative()) {
$message .= sprintf('. Use "%s" instead', $function->getAlternative());
}
$src = $this->parser->getStream()->getSourceContext();
$message .= sprintf(' in %s at line %d.', $src->getPath() ?: $src->getName(), $line);
@trigger_error($message, E_USER_DEPRECATED);
}
return $function->getNodeClass();
}
private function getFilterNodeClass($name, $line)
{
if (false === $filter = $this->env->getFilter($name)) {
$e = new Twig_Error_Syntax(sprintf('Unknown "%s" filter.', $name), $line, $this->parser->getStream()->getSourceContext());
$e->addSuggestions($name, array_keys($this->env->getFilters()));
throw $e;
}
if ($filter->isDeprecated()) {
$message = sprintf('Twig Filter "%s" is deprecated', $filter->getName());
if (!is_bool($filter->getDeprecatedVersion())) {
$message .= sprintf(' since version %s', $filter->getDeprecatedVersion());
}
if ($filter->getAlternative()) {
$message .= sprintf('. Use "%s" instead', $filter->getAlternative());
}
$src = $this->parser->getStream()->getSourceContext();
$message .= sprintf(' in %s at line %d.', $src->getPath() ?: $src->getName(), $line);
@trigger_error($message, E_USER_DEPRECATED);
}
return $filter->getNodeClass();
}
// checks that the node only contains "constant" elements
private function checkConstantExpression(Twig_Node $node)
{
if (!($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;
}
}
class_alias('Twig_ExpressionParser', 'Twig\ExpressionParser', false);
