[antlr-interest] exceptions in the lexer

[Paul J. Lucas]

On Mon, 6 Dec 2004, Terence Parr wrote:

> Are you familiar with the filter option on the lexer grammar?

	Yes in the sense that I've read that bit of the documentation,
	but I've never used it.

	I don't want my entire lexer to be a filter since I need it to
	be a real lexer for a parser.

	My particular case at hand is dealing with pragmas that can
	appear anywhere comments can.  Since comments are most easily
	handled in the lexer, I handle pragmas there to for the same
	reason.  The problem is what to do if there's an error in a
	pragma.  The lexer can't throw user-defined exceptions.  (I
	might be able to work around it by hiding the real exception
	inside a Runtime exception, but that's ugly.

	- Paul



 
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