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Extends the iter-92 brainfuck.ml subset interpreter with bracket
matching:
'[' if mem[ptr] = 0, jump past matching ']'
(forward depth-counting scan: '[' increments depth, ']' decrements)
']' if mem[ptr] <> 0, jump back to matching '['
(backward depth-counting scan)
Test program '+++[.-]':
+++ set cell 0 = 3
[ enter loop (cell != 0)
. acc += cell
- cell -= 1
] loop while cell != 0
result: acc = 3 + 2 + 1 = 6
Tests deeply nested while loops, mutable pc / ptr / acc, multi-arm
if/else if dispatch on chars + nested begin/end blocks for loop
body conditionals.
58 baseline programs total.