Iterator - Parrot Iterator Class
Iterators are used in combination with other classes (mainly aggregates) to visit all entries in that aggregate.
Iterate from the beginning of the aggregate:
new P0, .Iterator, P1 # setup iterator for aggregate P1 set P0, 0 # reset iterator, begin at start iter_loop: unless P0, iter_end # while (entries) ... shift P2, P0 # get entry ... branch iter_loop
Iterate from the end of the aggregate (Array like classes only):
new P0, .Iterator, P1 # setup iterator for aggregate P1 set P0, 3 # reset iterator, begin at end iter_loop: unless P0, iter_end # while (entries) ... pop P2, P0 # get entry ... branch iter_loop
.include "datatypes.pasm" # type constants new P0, .Iterator, P1 # setup iterator for hash P1 set P0, 0 # reset iterator, begin at start iter_loop: unless P0, iter_end # while (entries) ... shift S2, P0 # get key for next entry typeof I0, P0[S2] # get type of entry at key S2 ne I0, .DATATYPE_INTVAL, no_int set I1, P0[S2] # extract integer no_int: ... branch iter_loop
classes/iterator.pmc, t/pmc/iter.t
Leopold Toetsch <lt@toetsch.at>
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