120 lines
3.0 KiB
C++
120 lines
3.0 KiB
C++
#include <iostream>
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#include <vector>
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#include <string.h>
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#include <string>
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int main(int argc, char **argv) {
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std::string ops;
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if (argc == 1) {
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std::string line;
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while (std::getline(std::cin, line)) {
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ops.append(line);
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}
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if (ops.empty()) {
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std::cerr << "No input given";
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return 1;
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}
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} else {
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ops.assign(argv[1], strlen(argv[1]));
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}
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int len = ops.length();
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std::vector<char> tape = { 0 };
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int oix = 0;
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int tix = 0;
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while (oix < len) {
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switch (ops[oix]) {
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case '>':
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tix++;
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if (tix >= tape.size()) {
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tape.push_back(0);
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}
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oix++;
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break;
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case '<':
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tix--;
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if (tix < 0) {
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std::cerr << "Out of bounds";
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return 1;
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}
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oix++;
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break;
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case '+':
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tape[tix]++;
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oix++;
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break;
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case '-':
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tape[tix]--;
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oix++;
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break;
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case '.':
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std::cout << tape[tix];
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oix++;
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break;
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case ',':
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std::cin >> tape[tix];
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oix++;
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break;
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case '[':
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if (tape[tix] == 0) {
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int ls = 0;
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int rs = 0;
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for (int i = oix; i < len; i++) {
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switch (ops[i]) {
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case '[':
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ls++;
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break;
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case ']':
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rs++;
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break;
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default:
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break;
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}
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if (ls == rs) {
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oix = i + 1;
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break;
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}
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}
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} else {
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oix++;
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}
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break;
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case ']':
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if (tape[tix] != 0) {
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int ls = 0;
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int rs = 0;
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for (int i = oix; i >= 0; i--) {
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switch (ops[i]) {
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case '[':
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ls++;
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break;
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case ']':
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rs++;
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break;
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default:
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break;
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}
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if (ls == rs) {
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oix = i + 1;
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break;
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}
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}
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} else {
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oix++;
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}
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break;
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default:
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oix++;
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}
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}
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return 0;
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}
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