Grammar does not recover correctly on parse error

[nishtahir]

Normally, when the ANTLR runtime encounters a parse error, it attempts to recover by removing tokens from the token stream until it finds a token that satisfies the current or enclosing context.

However, in our case, it seems that Wist is unable to recover from a parse error because it makes the assumption that the enclosing scope is always a componentContext or componentHeadContext. These are always followed by EOF which means that the runtime will continue to remove tokens from the stream until the end of the file.

It seems that the solution is to remove the component rule as well as the componentBody rule from componentHeadElement.