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simple-assembler-interpreter-2.js
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simple-assembler-interpreter-2.js
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// solution for: https://www.codewars.com/kata/58e61f3d8ff24f774400002c/solutions/javascript
function parsedProgram(programInput) {
return programInput
.split(/\n/)
.reduce(
(memory, line) => {
const lineWithoutComment = line.replace(/;.*$/, '').trim();
if (lineWithoutComment) {
memory.program.push(lineWithoutComment);
const isFunctionLabel = /^\w+:$/.test(lineWithoutComment);
if (isFunctionLabel) {
memory.functions[lineWithoutComment.slice(0, -1)] = memory.program.length - 1;
}
const shouldMarkProgramEndingCorrectly = memory.hasMissingEnd && lineWithoutComment == 'end';
if (shouldMarkProgramEndingCorrectly) {
memory.hasMissingEnd = false;
}
}
return memory;
},
{ program: [], functions: {}, hasMissingEnd: true },
);
}
function safeKey(key) {
return key.replace(/,$/, '');
}
function parsedValue(registry, value) {
if (/'.+'/.test(value)) {
return value.slice(1, -1);
}
const number = Number(value);
if (number == number) {
return number;
}
const fromRegistry = registry[safeKey(value)];
if (fromRegistry !== undefined) {
return fromRegistry;
}
return value;
}
function byWhiteSpace(line) {
return line.split(/\s+/);
}
function byMsgFormat(line) {
const outcome = [];
const regex = /\w+|'[\w\s:()+-=\/!^]+'/g;
const next = () => regex.exec(line);
for (let match = next(); match !== null; match = next()) {
outcome.push(match[0]);
}
return outcome;
}
function assemblerInterpreter(programInput) {
const { program, functions, hasMissingEnd } = parsedProgram(programInput);
if (hasMissingEnd) return -1;
const programSize = program.length;
const registry = {};
let output = [];
const parsed = parsedValue.bind(null, registry);
for (const head = [0]; head[0] < programSize; head[0]++) {
const line = program[head[0]];
const lineBySpace = byWhiteSpace(line);
const [operation] = lineBySpace;
switch (operation) {
case 'mov': {
const [, keyRaw, value] = lineBySpace;
const key = safeKey(keyRaw);
registry[key] = parsed(value);
break;
}
case 'inc': {
const [, keyRaw] = lineBySpace;
const key = safeKey(keyRaw);
registry[key]++;
break;
}
case 'dec': {
const [, keyRaw] = lineBySpace;
const key = safeKey(keyRaw);
registry[key]--;
break;
}
case 'add': {
const [, keyRaw, value] = lineBySpace;
const key = safeKey(keyRaw);
registry[key] += parsed(value);
break;
}
case 'sub': {
const [, keyRaw, value] = lineBySpace;
const key = safeKey(keyRaw);
registry[key] -= parsed(value);
break;
}
case 'mul': {
const [, keyRaw, value] = lineBySpace;
const key = safeKey(keyRaw);
registry[key] *= parsed(value);
break;
}
case 'div': {
const [, keyRaw, value] = lineBySpace;
const key = safeKey(keyRaw);
registry[key] = Math.floor(registry[key] / parsed(value));
break;
}
case 'jmp': {
const [, fn] = lineBySpace;
head[0] = functions[fn];
break;
}
case 'cmp': {
const [, a, b] = lineBySpace;
const nextLine = program[head[0] + 1];
const [jumpIf, fn] = byWhiteSpace(nextLine);
head[0]++;
switch (jumpIf) {
case 'je': {
if (parsed(a) == parsed(b)) head[0] = functions[fn];
break;
}
case 'jne': {
if (parsed(a) != parsed(b)) head[0] = functions[fn];
break;
}
case 'jle': {
if (parsed(a) <= parsed(b)) head[0] = functions[fn];
break;
}
case 'jl': {
if (parsed(a) < parsed(b)) head[0] = functions[fn];
break;
}
case 'jge': {
if (parsed(a) >= parsed(b)) head[0] = functions[fn];
break;
}
case 'jg': {
if (parsed(a) > parsed(b)) head[0] = functions[fn];
break;
}
}
break;
}
case 'call': {
const [, fn] = lineBySpace;
head.unshift(functions[fn]);
break;
}
case 'ret': {
head.shift();
break;
}
case 'msg': {
output = byMsgFormat(line).slice(1).reduce(
(output, item) => {
const value = parsedValue(registry, item);
if (item != value) {
output.push(value)
}
return output;
},
[],
);
break;
}
case 'end': {
return output.join('');
}
}
}
return -1;
}