Created
April 27, 2018 16:05
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write brainfuck intepreter with recursion
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| const recurr = (fn => fn( | |
| (f => f(f)) | |
| (self => | |
| x => | |
| fn(self(self))(x) | |
| ) | |
| )) | |
| recurr( | |
| main => | |
| actions => | |
| branch => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => { | |
| // console.log(branch, codePtr, code[codePtr], bufferPtr, buffer[bufferPtr], depth); | |
| actions[branch] | |
| (main)(actions) | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(untilDepth) | |
| } | |
| ) | |
| ({ | |
| "code_act": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => { | |
| if (actions[code[codePtr]]) { | |
| main(actions)(code[codePtr]) | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(untilDepth) | |
| } | |
| }, | |
| ">": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => ( | |
| main(actions)("code_next") | |
| (buffer)(bufferPtr + 1) | |
| (code)(codePtr) | |
| (depth)(untilDepth) | |
| ), | |
| "<": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => ( | |
| main(actions)("code_next") | |
| (buffer)(bufferPtr - 1) | |
| (code)(codePtr) | |
| (depth)(untilDepth) | |
| ), | |
| "+": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => ( | |
| buffer[bufferPtr]++, | |
| main(actions)("code_next") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(untilDepth) | |
| ), | |
| "-": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => ( | |
| buffer[bufferPtr]--, | |
| main(actions)("code_next") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(untilDepth) | |
| ), | |
| "[": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => ( | |
| buffer[bufferPtr] === 0 ? | |
| main(actions)("code_next_until") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(depth) : | |
| main(actions)("code_next") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(depth) | |
| ), | |
| "]": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => ( | |
| buffer[bufferPtr] !== 0 ? | |
| main(actions)("code_prev_until") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(depth) : | |
| main(actions)("code_next") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(depth) | |
| ), | |
| ".": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => ( | |
| process.stdout.write(String.fromCharCode(buffer[bufferPtr])), | |
| main(actions)("code_next") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(depth) | |
| ), | |
| ",": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => { | |
| throw new Error('not implement'); | |
| buffer[bufferPtr] = prompt('input char').charCodeAt(0); | |
| main(actions)("code_next") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(depth) | |
| }, | |
| "code_next": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => ( | |
| main(actions)("code_act") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr + 1) | |
| (depth + | |
| (code[codePtr] === "[") - | |
| (code[codePtr + 1] === "]") | |
| )(untilDepth) | |
| ), | |
| "code_next_until": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => { | |
| do { | |
| depth = depth + | |
| (code[codePtr] === "[") - | |
| (code[codePtr + 1] === "]"); | |
| codePtr++ | |
| } while (depth !== untilDepth) | |
| main(actions)("code_act") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(untilDepth) | |
| }, | |
| "code_prev_until": main => | |
| actions => | |
| buffer => bufferPtr => | |
| code => codePtr => | |
| depth => untilDepth => { | |
| do { | |
| depth = depth - | |
| (code[codePtr - 1] === "[") + | |
| (code[codePtr] === "]"); | |
| codePtr-- | |
| } while (depth !== untilDepth) | |
| main(actions)("code_act") | |
| (buffer)(bufferPtr) | |
| (code)(codePtr) | |
| (depth)(untilDepth) | |
| }, | |
| }) | |
| ('code_act') | |
| (new Uint8Array(256))(0) | |
| ('++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.')(0) | |
| (0)(0) |
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