getExpressionParser example

final class MacroTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $lineno = $token->getLine();
        $stream = $this->parser->getStream();
        $name = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue();

        $arguments = $this->parser->getExpressionParser()->parseArguments(true, true);

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

            if ($value != $name) {
                throw new SyntaxError(sprintf('Expected endmacro for macro "%s" (but "%s" given).', $name, $value), $stream->getCurrent()->getLine(), $stream->getSourceContext());
            }
        }
        

$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);

        return new Node();
    }

    public function getTag(): string
    {
        return 'extends';
    }
}

use Twig\TokenParser\AbstractTokenParser;

#[Package('core')] final class ReturnNodeTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): ReturnNode
    {
        $stream = $this->parser->getStream();
        $nodes = [];

        if (!$stream->test(Token::BLOCK_END_TYPE)) {
            $nodes['expr'] = $this->parser->getExpressionParser()->parseExpression();
        }

        $stream->expect(Token::BLOCK_END_TYPE);

        return new ReturnNode($nodes, [], $token->getLine(), $this->getTag());
    }

    public function getTag(): string
    {
        return 'return';
    }
}

  public function parse(Token $token) {
    $lineno = $token->getLine();
    $stream = $this->parser->getStream();
    $body = NULL;
    $options = NULL;
    $count = NULL;
    $plural = NULL;

    if (!$stream->test(Token::BLOCK_END_TYPE) && $stream->test(Token::STRING_TYPE)) {
      $body = $this->parser->getExpressionParser()->parseExpression();
    }
    if (!$stream->test(Token::BLOCK_END_TYPE) && $stream->test(Token::NAME_TYPE, 'with')) {
      $stream->next();
      $options = $this->parser->getExpressionParser()->parseExpression();
    }
    if (!$body) {
      $stream->expect(Token::BLOCK_END_TYPE);
      $body = $this->parser->subparse([$this, 'decideForFork']);
      if ('plural' === $stream->next()->getValue()) {
        $count = $this->parser->getExpressionParser()->parseExpression();
        $stream->expect(Token::BLOCK_END_TYPE);
        

final class ForTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $lineno = $token->getLine();
        $stream = $this->parser->getStream();
        $targets = $this->parser->getExpressionParser()->parseAssignmentExpression();
        $stream->expect(/* Token::OPERATOR_TYPE */ 8, 'in');
        $seq = $this->parser->getExpressionParser()->parseExpression();

        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
        $body = $this->parser->subparse([$this, 'decideForFork']);
        if ('else' == $stream->next()->getValue()) {
            $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
            $else = $this->parser->subparse([$this, 'decideForEnd'], true);
        } else {
            $else = null;
        }
        

final class DeprecatedTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $expr = $this->parser->getExpressionParser()->parseExpression();

        $this->parser->getStream()->expect(Token::BLOCK_END_TYPE);

        return new DeprecatedNode($expr, $token->getLine(), $this->getTag());
    }

    public function getTag(): string
    {
        return 'deprecated';
    }
}

use Twig\Token;

/** * Evaluates an expression, discarding the returned value. * * @internal */
final class DoTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $expr = $this->parser->getExpressionParser()->parseExpression();

        $this->parser->getStream()->expect(/* Token::BLOCK_END_TYPE */ 3);

        return new DoNode($expr, $token->getLine(), $this->getTag());
    }

    public function getTag(): string
    {
        return 'do';
    }
}

use Twig\TokenParser\AbstractTokenParser;

/** * Token Parser for the 'trans_default_domain' tag. * * @author Fabien Potencier <fabien@symfony.com> */
final class TransDefaultDomainTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $expr = $this->parser->getExpressionParser()->parseExpression();

        $this->parser->getStream()->expect(Token::BLOCK_END_TYPE);

        return new TransDefaultDomainNode($expr, $token->getLine(), $this->getTag());
    }

    public function getTag(): string
    {
        return 'trans_default_domain';
    }
}

$lineno = $token->getLine();
        $stream = $this->parser->getStream();

        $count = null;
        $vars = new ArrayExpression([], $lineno);
        $domain = null;
        $locale = null;
        if (!$stream->test(Token::BLOCK_END_TYPE)) {
            if ($stream->test('count')) {
                // {% trans count 5 %}                 $stream->next();
                $count = $this->parser->getExpressionParser()->parseExpression();
            }

            if ($stream->test('with')) {
                // {% trans with vars %}                 $stream->next();
                $vars = $this->parser->getExpressionParser()->parseExpression();
            }

            if ($stream->test('from')) {
                // {% trans from "messages" %}                 $stream->next();
                

#[Package('storefront')] final class IconTokenParser extends AbstractTokenParser
{
    /** * @var Parser */
    protected $parser;

    public function parse(Token $token): SwInclude
    {
        $expr = $this->parser->getExpressionParser()->parseExpression();

        $icon = $expr->getAttribute('value');

        $expr->setAttribute('value', '@Storefront/storefront/utilities/icon.html.twig');

        $stream = $this->parser->getStream();

        $variables = new ArrayExpression([], $token->getLine());

        if ($stream->nextIf(Token::NAME_TYPE, 'style')) {
            /** @var ArrayExpression $variables */
            

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) {
                    throw new SyntaxError(sprintf('Expected endblock for block "%s" (but "%s" given).', $name, $value), $stream->getCurrent()->getLine(), $stream->getSourceContext());
                }
            }
        } else {
            $body = new Node([
                new PrintNode($this->parser->getExpressionParser()->parseExpression(), $lineno),
            ]);
        }
        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);

        $block->setNode('body', $body);
        $this->parser->popBlockStack();
        $this->parser->popLocalScope();

        return new BlockReferenceNode($name, $lineno, $this->getTag());
    }

    

final class IfTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $lineno = $token->getLine();
        $expr = $this->parser->getExpressionParser()->parseExpression();
        $stream = $this->parser->getStream();
        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
        $body = $this->parser->subparse([$this, 'decideIfFork']);
        $tests = [$expr, $body];
        $else = null;

        $end = false;
        while (!$end) {
            switch ($stream->next()->getValue()) {
                case 'else':
                    $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
                    

/** * Imports macros. * * {% import 'forms.html' as forms %} * * @internal */
final class ImportTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $macro = $this->parser->getExpressionParser()->parseExpression();
        $this->parser->getStream()->expect(/* Token::NAME_TYPE */ 5, 'as');
        $var = new AssignNameExpression($this->parser->getStream()->expect(/* Token::NAME_TYPE */ 5)->getValue(), $token->getLine());
        $this->parser->getStream()->expect(/* Token::BLOCK_END_TYPE */ 3);

        $this->parser->addImportedSymbol('template', $var->getAttribute('name'));

        return new ImportNode($macro, $var, $token->getLine(), $this->getTag(), $this->parser->isMainScope());
    }

    public function getTag(): string
    {
        

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();

                

final class ApplyTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $lineno = $token->getLine();
        $name = $this->parser->getVarName();

        $ref = new TempNameExpression($name, $lineno);
        $ref->setAttribute('always_defined', true);

        $filter = $this->parser->getExpressionParser()->parseFilterExpressionRaw($ref, $this->getTag());

        $this->parser->getStream()->expect(Token::BLOCK_END_TYPE);
        $body = $this->parser->subparse([$this, 'decideApplyEnd'], true);
        $this->parser->getStream()->expect(Token::BLOCK_END_TYPE);

        return new Node([
            new SetNode(true, $ref, $body, $lineno, $this->getTag()),
            new PrintNode($filter, $lineno, $this->getTag()),
        ]);
    }