Execute Brain****/Lua: Difference between revisions
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{{implementation|Brainf***}}{{collection|RCBF}}
An implementation of a Brainf*** interpreter in [[Lua]].
<
program = io.read("*all")
pointer = 1
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if memory[pointer] ~= 0 then
table.insert(retpoints, instruction)
else -- if the memory at the pointer is zero, jump to the matching close bracket
else▼
local b = 1 -- b stores number of unclosed brackets (when b == 0 the match has been found)
while program:sub(instruction, instruction) ~= "]" do▼
b = b + 1
elseif program:sub(instruction, instruction) == "]" then
b = b - 1
end
end
if b ~= 0 then
error"Missing ']'!"
end
end
end,
["]"] = function()
if
if memory[pointer] ~= 0 then
▲ instruction = retpoints[#retpoints]
instruction = retpoints[#retpoints]
▲ else
table.remove(retpoints)▼
end
else
error"Missing '['!"
▲ table.remove(retpoints)
end
end,
Line 52 ⟶ 66:
if instr then instr() end
instruction = instruction + 1
end</
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