\ Structural Conditionals, loops part 12dec92py
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\ Structural Conditionals 12dec92py
Variable leavings
: (leave) here leavings @ , leavings ! ;
: LEAVE compile branch (leave) ; immediate restrict
: ?LEAVE compile 0= compile ?branch (leave) ;
immediate restrict
: DONE ( addr -- ) leavings @
BEGIN 2dup u<= WHILE dup @ swap >resolve REPEAT
leavings ! drop ; immediate restrict
\ Structural Conditionals 12dec92py
: DO compile (do) here ; immediate restrict
: ?DO compile (?do) (leave) here ;
immediate restrict
: FOR compile (for) here ; immediate restrict
: loop] dup <resolve 2 cells - compile done compile unloop ;
: LOOP sys? compile (loop) loop] ; immediate restrict
: +LOOP sys? compile (+loop) loop] ; immediate restrict
: NEXT sys? compile (next) loop] ; immediate restrict
: EXIT compile ;s ; immediate restrict
: ?EXIT postpone IF postpone EXIT postpone THEN ; immediate restrict
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