SyntaxError example

$stream->expect(/* Token::BLOCK_END_TYPE */ 3);
                    $body = $this->parser->subparse([$this, 'decideIfFork']);
                    $tests[] = $expr;
                    $tests[] = $body;
                    break;

                case 'endif':
                    $end = true;
                    break;

                default:
                    throw new SyntaxError(sprintf('Unexpected end of template. Twig was looking for the following tags "else", "elseif", or "endif" to close the "if" block started at line %d).', $lineno), $stream->getCurrent()->getLine(), $stream->getSourceContext());
            }
        }

        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);

        return new IfNode(new Node($tests), $else, $lineno, $this->getTag());
    }

    public function decideIfFork(Token $token): bool
    {
        return $token->test(['elseif', 'else', 'endif']);
    }

        if (!\in_array($value, $array, true)) {
            trigger_deprecation('symfony/expression-language', '6.3', 'The "in" operator will use strict comparisons in Symfony 7.0. Loose match found with key "%s" for value %s. Normalize the array parameter so it only has the expected types or implement loose matching in your own expression function.', $key, json_encode($value));
        }

        return true;
    }

    private function evaluateMatches(string $regexp, ?string $str): int
    {
        set_error_handler(static fn ($t, $m) => throw new SyntaxError(sprintf('Regexp "%s" passed to "matches" is not valid', $regexp).substr($m, 12)));
        try {
            return preg_match($regexp, (string) $str);
        } finally {
            restore_error_handler();
        }
    }
}

if (
        $node instanceof TextNode
        ||
        ($node instanceof PrintNode && $node->getNode('expr') instanceof NameExpression)
        ||
        ($node instanceof PrintNode && $node->getNode('expr') instanceof GetAttrExpression)
        ||
        ($node instanceof PrintNode && $node->getNode('expr') instanceof FilterExpression)
      ) {
        continue;
      }
      throw new SyntaxError(sprintf('The text to be translated with "trans" can only contain references to simple variables'), $lineno);
    }
  }

}

/** * @throws SyntaxError */
    private function doParse(TokenStream $stream, ?array $names = []): Node\Node
    {
        $this->stream = $stream;
        $this->names = $names;

        $node = $this->parseExpression();
        if (!$stream->isEOF()) {
            throw new SyntaxError(sprintf('Unexpected token "%s" of value "%s".', $stream->current->type, $stream->current->value), $stream->current->cursor, $stream->getExpression());
        }

        unset($this->stream, $this->names);

        return $node;
    }

    /** * @return Node\Node */
    public function parseExpression(int $precedence = 0)
    {

    public function compileSource(Source $source): string
    {
        try {
            return $this->compile($this->parse($this->tokenize($source)));
        } catch (Error $e) {
            $e->setSourceContext($source);
            throw $e;
        } catch (\Exception $e) {
            throw new SyntaxError(sprintf('An exception has been thrown during the compilation of a template ("%s").', $e->getMessage()), -1, $source, $e);
        }
    }

    public function setLoader(LoaderInterface $loader)
    {
        $this->loader = $loader;
    }

    public function getLoader(): LoaderInterface
    {
        return $this->loader;
    }

$placeholder = sprintf('%s%s', $argPrefix, $argName);
          $text .= $placeholder;
          $expr->setAttribute('placeholder', $placeholder);
          $tokens[] = $expr;
        }
        else {
          $text .= $node->getAttribute('data');
        }
      }
    }
    elseif (!$body->hasAttribute('data')) {
      throw new SyntaxError('{% trans %} tag cannot be empty');
    }
    else {
      $text = $body->getAttribute('data');
    }

    return [
      new Node([new ConstantExpression(trim($text), $body->getTemplateLine())]),
      $tokens,
    ];
  }

}

/** * Sets the pointer to the next token and returns the old one. * * @return void */
    public function next()
    {
        ++$this->position;

        if (!isset($this->tokens[$this->position])) {
            throw new SyntaxError('Unexpected end of expression.', $this->current->cursor, $this->expression);
        }

        $this->current = $this->tokens[$this->position];
    }

    /** * @param string|null $message The syntax error message * * @return void */
    public function expect(string $type, string $value = null, string $message = null)
    {

        $callType = $this->getAttribute('type');
        $callName = $this->getAttribute('name');

        $parameters = [];
        $named = false;
        foreach ($arguments as $name => $node) {
            if (!\is_int($name)) {
                $named = true;
                $name = $this->normalizeName($name);
            } elseif ($named) {
                throw new SyntaxError(sprintf('Positional arguments cannot be used after named arguments for %s "%s".', $callType, $callName), $this->getTemplateLine(), $this->getSourceContext());
            }

            $parameters[$name] = $node;
        }

        $isVariadic = $this->hasAttribute('is_variadic') && $this->getAttribute('is_variadic');
        if (!$named && !$isVariadic) {
            return $parameters;
        }

        if (!$callable) {
            

'security-http' => 'add the "SecurityBundle"',
        'web-link' => 'enable "framework.web_link"',
        'workflow' => 'enable "framework.workflows"',
    ];

    public static function onUndefinedFilter(string $name): TwigFilter|false
    {
        if (!isset(self::FILTER_COMPONENTS[$name])) {
            return false;
        }

        throw new SyntaxError(self::onUndefined($name, 'filter', self::FILTER_COMPONENTS[$name]));
    }

    public static function onUndefinedFunction(string $name): TwigFunction|false
    {
        if (!isset(self::FUNCTION_COMPONENTS[$name])) {
            return false;
        }

        if ('webpack-encore-bundle' === self::FUNCTION_COMPONENTS[$name]) {
            return new TwigFunction($name, static fn () => '');
        }

        

$token = $this->stream->next();
                    $expr = $this->expressionParser->parseExpression();
                    $this->stream->expect(/* Token::VAR_END_TYPE */ 4);
                    $rv[] = new PrintNode($expr, $token->getLine());
                    break;

                case /* Token::BLOCK_START_TYPE */ 1:
                    $this->stream->next();
                    $token = $this->getCurrentToken();

                    if (/* Token::NAME_TYPE */ 5 !== $token->getType()) {
                        throw new SyntaxError('A block must start with a tag name.', $token->getLine(), $this->stream->getSourceContext());
                    }

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

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

                        

final class UseTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $template = $this->parser->getExpressionParser()->parseExpression();
        $stream = $this->parser->getStream();

        if (!$template instanceof ConstantExpression) {
            throw new SyntaxError('The template references in a "use" statement must be a string.', $stream->getCurrent()->getLine(), $stream->getSourceContext());
        }

        $targets = [];
        if ($stream->nextIf('with')) {
            do {
                $name = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue();

                $alias = $name;
                if ($stream->nextIf('as')) {
                    $alias = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue();
                }

                

$node->setAttribute('is_defined_test', true);
            $this->changeIgnoreStrictCheck($node);
        } elseif ($node instanceof BlockReferenceExpression) {
            $node->setAttribute('is_defined_test', true);
        } elseif ($node instanceof FunctionExpression && 'constant' === $node->getAttribute('name')) {
            $node->setAttribute('is_defined_test', true);
        } elseif ($node instanceof ConstantExpression || $node instanceof ArrayExpression) {
            $node = new ConstantExpression(true, $node->getTemplateLine());
        } elseif ($node instanceof MethodCallExpression) {
            $node->setAttribute('is_defined_test', true);
        } else {
            throw new SyntaxError('The "defined" test only works with simple variables.', $lineno);
        }

        parent::__construct($node, $name, $arguments, $lineno);
    }

    private function changeIgnoreStrictCheck(GetAttrExpression $node)
    {
        $node->setAttribute('optimizable', false);
        $node->setAttribute('ignore_strict_check', true);

        if ($node->getNode('node') instanceof GetAttrExpression) {
            

final class ExtendsTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $stream = $this->parser->getStream();

        if ($this->parser->peekBlockStack()) {
            throw new SyntaxError('Cannot use "extend" in a block.', $token->getLine(), $stream->getSourceContext());
        } elseif (!$this->parser->isMainScope()) {
            throw new SyntaxError('Cannot use "extend" in a macro.', $token->getLine(), $stream->getSourceContext());
        }

        if (null !== $this->parser->getParent()) {
            throw new SyntaxError('Multiple extends tags are forbidden.', $token->getLine(), $stream->getSourceContext());
        }
        $this->parser->setParent($this->parser->getExpressionParser()->parseExpression());

        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);

        

final class BlockTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $lineno = $token->getLine();
        $stream = $this->parser->getStream();
        $name = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue();
        if ($this->parser->hasBlock($name)) {
            throw new SyntaxError(sprintf("The block '%s' has already been defined line %d.", $name, $this->parser->getBlock($name)->getTemplateLine()), $stream->getCurrent()->getLine(), $stream->getSourceContext());
        }
        $this->parser->setBlock($name, $block = new BlockNode($name, new Node([]), $lineno));
        $this->parser->pushLocalScope();
        $this->parser->pushBlockStack($name);

        if ($stream->nextIf(/* Token::BLOCK_END_TYPE */ 3)) {
            $body = $this->parser->subparse([$this, 'decideBlockEnd'], true);
            if ($token = $stream->nextIf(/* Token::NAME_TYPE */ 5)) {
                $value = $token->getValue();

                if ($value != $name) {
                    

case /* Token::OPERATOR_TYPE */ 8:
                if (preg_match(Lexer::REGEX_NAME, $token->getValue(), $matches) && $matches[0] == $token->getValue()) {
                    // in this context, string operators are variable names                     $this->parser->getStream()->next();
                    $node = new NameExpression($token->getValue(), $token->getLine());
                    break;
                }

                if (isset($this->unaryOperators[$token->getValue()])) {
                    $class = $this->unaryOperators[$token->getValue()]['class'];
                    if (!\in_array($class, [NegUnary::class, PosUnary::class])) {
                        throw new SyntaxError(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: