> 2) ANTLR was not good for speculative parsing or probabilistic parsing which would be the basis of today's generation of tools such as "Intellisense" not givi

> 2) ANTLR was not good for speculative parsing or probabilistic parsing which would be the basis of today's generation of tools such as "Intellisense" not giving up on parsing when there's an unclosed brace or missing variable declaration. ANTLR does have some generic error recovery capabilities such as single token insertion/deletion or re-sync recovery. There is a whole chapter describing the algorithms in the ANTLR book: http://media.pragprog.com/titles/tpantlr/errors.pdf http://media.pragprog.com/titles/tpantlr/errors.pdf (unfortunately this link does not contain the full content of the chapter). These kinds of generic heuristics is not something that would be simple to implement in most hand build parsers as they require full knowledge of the entire grammar and that information is often "hard coded" as source code not as a separate data structure.