Inject tokens after the current one.
Look at the next token.
Set the pointer to the next token and returns the previous one.
Test the current token, then, if the test is successful, sets the pointer to the next one and returns the tested token.
The next token if the condition is true, null otherwise
Serialize the stream to a Twig string.
Test the current token.
Construct and return a list of tokens relevant to render a Twig template.
Traverse the stream using a visitor.
Inject tokens after the current one.