On Mon 09 Apr 01, 11:56 AM, Micah Cowan said:
>
> I can't think of a good reason why you'd need to use memmove() in your
> parser - perhaps you should rethink the algorithm?
well, maybe there IS a better way of doing things. but suppose a user inputs
Computer, initiate auto-destruct sequence 520010
and what i care about (in fact, what i use to fulfill the commnad) are the
words:
auto-destruct 520010
but i also want to allow the user to be more polite:
Computer, pretty please initiate auto-destuct sequence 520010.
i use memmove to do things like:
1. convert double spaces to single spaces
2. get rid of superfluous tokens like "pretty please" and "Computer".
and then i ship off the resulting string
auto-destruct 520010
to my parser which tokenizes the nouns and executes the relevant code for
auto destruction.
i know there are other ways of doing this (like searching the string for
certain tokens and building up a list from the start). however, i tend to
like this method better. because i can more easily see what's going on when my
parser handles "auto-destuct 520010" rather than (12 52 00 10). there are a
lot of tokens, and i'd rather work with "auto-destruct" than "12".
it occurs to me that this is the sort of thing that's perfect for lex/yacc, but
i've been dragging my feet because it looks fairly complicated. i think maybe
i'll take a look at it though.
pete
> I've lately been
> very interested in the subject in general, so I've been working
> through my copy of the Wizard book. /Very/ informative reading (the C
> code's kinda dated, though).
>
> Micah
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