68 lines
1.7 KiB
Plaintext
68 lines
1.7 KiB
Plaintext
while true {
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print("bf> ");
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let program = input();
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let tape = [0]*256;
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let ptr = 0;
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let i = 0;
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while i < len(program) {
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let op = program[i];
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if op == '+' {
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tape[ptr] += 1;
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if tape[ptr] >= 256 {
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tape[ptr] -= 256;
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}
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} elif op == '-' {
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tape[ptr] -= 1;
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if tape[ptr] < 0 {
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tape[ptr] += 256;
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}
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} elif op == '>' {
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ptr += 1;
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} elif op == '<' {
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ptr -= 1;
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} elif op == '.' {
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print(chr(tape[ptr]));
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} elif op == ',' {
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tape[ptr] = ord(input()[0]);
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} elif op == '[' {
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if tape[ptr] == 0 {
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let depth = 0;
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while true {
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i += 1;
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if program[i] == ']' {
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if depth == 0 {
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break;
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}
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depth -= 1;
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} elif program[i] == '[' {
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depth += 1;
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}
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}
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}
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} elif op == ']' {
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if tape[ptr] != 0 {
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let depth = 0;
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let running = true;
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while true {
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i -= 1;
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if program[i] == '[' {
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if depth == 0 {
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break;
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}
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depth -= 1;
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} elif program[i] == ']' {
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depth += 1;
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}
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}
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}
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}
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if ptr >= len(tape) {
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tape += [0]*256;
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}
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i += 1;
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}
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println("");
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}
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