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John Cowan <jcowan@r...> wrote:
| Arjun Ray scripsit:
|> I find the while( event ) { switch( type ) { } } structure, which
|> inevitably appears, more than a little clumsy.
|
| I don't understand what this control structure has to do with recursive
| descent: I rarely if ever see such a thing. Can you exemplify?
Not in classic RD, of course. The pull parser is just the same pattern,
not classic RD. The while() part emerges in the handling of lists:
list
: item
| item list
;
In classic RD list() looks like this
do_list( ) {
do_item( ) ;
if ( next token starts an item )
do_list( ) ;
}
which can also be done thusly:
do_list( ) {
while ( next token starts an item )
do_item( ) ;
}
If you insist on the first style, you must be a Schemer at heart. ;-)
|
