63 lines
2.0 KiB
JavaScript
63 lines
2.0 KiB
JavaScript
// https://www.codewars.com/kata/58e61f3d8ff24f774400002c/javascript
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function assemblerInterpreter(program) {
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const lines = (program
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.split(/\n/)
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.map(line => line.replace(/;.*$/, '').trim())
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.filter(line => line !== ''));
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const parsed = [];
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const labels = new Map();
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let diff = 0;
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for (i = 0; i < lines.length; ++i) {
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const tokens = lines[i].split(/[,\s]+/);
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const m = tokens[0].match(/(\w+)\:/);
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if (m) {
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labels.set(m[1], i-diff);
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++diff;
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} else if (tokens[0] === 'msg') {
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parsed[i-diff] = lines[i].match(/('[^']*')|[a-z0-9_]+/g);
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} else {
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parsed[i-diff] = tokens;
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}
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}
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let ip = 0;
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let cmp;
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const res = [];
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const stack = [];
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const regs = new Map();
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const constOrVal = n => ((+n) + '') === n ? +n : regs.get(n);
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const jmpIf = (lbl, cond) => ip = cond ? labels.get(lbl) - 1 : ip;
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const instr = {
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mov: (a, b) => regs.set(a, constOrVal(b)),
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inc: a => regs.set(a, regs.get(a) + 1),
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dec: a => regs.set(a, regs.get(a) - 1),
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add: (a, b) => regs.set(a, regs.get(a) + constOrVal(b)),
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sub: (a, b) => regs.set(a, regs.get(a) - constOrVal(b)),
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mul: (a, b) => regs.set(a, regs.get(a) * constOrVal(b)),
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div: (a, b) => regs.set(a, regs.get(a) / constOrVal(b) | 0),
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jmp: lbl => jmpIf(lbl, true),
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cmp: (a, b) => cmp = Math.sign(constOrVal(a) - constOrVal(b)),
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jne: lbl => jmpIf(lbl, cmp !== 0),
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je: lbl => jmpIf(lbl, cmp === 0),
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jge: lbl => jmpIf(lbl, cmp >= 0),
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jg: lbl => jmpIf(lbl, cmp > 0),
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jle: lbl => jmpIf(lbl, cmp <= 0),
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jl: lbl => jmpIf(lbl, cmp < 0),
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call: lbl => (stack.push(ip), jmpIf(lbl, true)),
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ret: () => ip = stack.pop(),
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msg: (...args) => res.push(args.map(arg => {
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const m = arg.match(/^'(.*)'$/);
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if (m) return m[1];
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return constOrVal(arg);
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}).join``)
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};
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let cntdwn = 1e6;
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while (ip < parsed.length && --cntdwn > 0) {
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const [cmd, ...args] = parsed[ip];
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if (cmd === 'end') return res.join``;
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instr[cmd](...args);
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++ip;
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}
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return -1;
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}
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