Re: Dynamic Language (grammar)

    pohanl@my-deja.com wrote:
> But have you noticed something? All the languages
> in the world has a fixed grammar.


Except Forth. Forth has fixed means of parsing ( I don't
know that I'd exactly call it a grammar ), but this
parse/compile mechanism can be changed at compile-time.


An excellent example of this power is an old Dr. Dobbs
article (circa 1980) in which the author provides code
to add a "switch-case" construct for Forth.


There's also a commercial Forth out there that supplies
an infix expression parser ( written in Forth ) for those
that would prefer not to use the native RPN constructs.


Jim Lawless
jimbo@radiks.net
http://www.radiks.net/jimbo
[As I noted in an earlier message, languages with extensible syntax were
in vogue 30 years ago. It's technically not hard, what's hard is to
find a practical use for it. -John]

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