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Execute Brain****/Lua: Difference between revisions
Fixed bracket matching and made them a bit more robust.
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(Fixed bracket matching and made them a bit more robust.) |
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Line 1:
{{implementation|Brainf***}}{{collection|RCBF}}
An implementation of a Brainf*** interpreter in [[Lua]].
<lang lua>memory = {0} --memory is bounded on one side, at 1
Line 30:
if memory[pointer] ~= 0 then
table.insert(retpoints, instruction)
else -- if the memory at the pointer is zero, jump to the
local b = 1 -- b stores number of unclosed brackets (when b == 0 the match has been found)
while program:sub(instruction, instruction) ~= "]" do▼
while instruction <= #program and b ~= 0 do
instruction = instruction + 1
b = b + 1
elseif program:sub(instruction, instruction) == "]"
b = b - 1
end
end
if b ~= 0 then
error"Missing ']'!"
end
end
end,
["]"] = function()
if
if memory[pointer] ~= 0 then
instruction = retpoints[#retpoints]
else
table.remove(retpoints)▼
end
else
error"Missing '['!"
▲ table.remove(retpoints)
end
end,
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