The engine will returns this message when the source text has been accepted as both complete and correct. In other words, the source text was successfully analyzed.

The parser reached the end of the file while reading a comment. This is caused when the source text contains a "run-away" comment, or in other words, a block comment that lacks the end-delimiter.

Something is very wrong when this message is returned.

The tokenizer will generate this message when it is unable to recognize a series of characters as a valid token. To recover, pop the invalid token from the input queue using Parser.PopInputToken.

When the engine is able to reduce a rule, this message is returned. The rule that was reduced is set in the Parser.Reduction property. The tokens that are reduced and correspond to the rule's definition can be acquired using the GetToken or GetTokens methods.

Often the parser will read a token that is not expected in the grammar. When this happens, you can acquire the expected tokens using the GetToken or GetTokens methods. To recover, push one of the expected tokens onto the input queue.

This message is returned each time a token is read.