Re: ANNOUNCE: Tiny, a parser generator for context sensitive grammars

"Daniel C. Wang" <danwang+news@cs.princeton.edu> wrote in message
news:01-08-028@comp.compilers...
> "Maurice Gittens" <maurice@gittens.nl> writes:
> {stuff deleted}
> > This is an interesting question. LALR(1) grammars have proven to
> > allow the generation of parsers for many languages used in practice.


> For Pascal and Java? I think the answer is yes here.


Pascal, yes, because Pascal's grammar is LL(1), although note that its
lexical grammar requires two tokens of lookahead to detect '..' correctly.


Java's is not due to the ambiguity of


(thing)+12


in expressions. This could be 'thing' as an object redundantly
parenthesised, add 12, or could be a cast of '+12' to 'thing' if 'thing' is
a type.


Personally I feel that the round-brackets cast isn't sensible in any
programming language - it really isn't obvious to the reader what's going on
without referring to the entirety of the remainder of the program. It's
therefore quite worrying to notice that MS adopted it for C#.


--
Mike Dimmick

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