customstyling.js

const fs = require('fs');
const { get } = require('http');
const fetch = require('node-fetch');

const fileToRead = process.argv[2];
const fileContent = fs.readFileSync(fileToRead, 'utf-8');
const tokens = fileContent.replace(/[\s\n\t\r]+/g, ' ').trim().split(' ');

const memory = {};

const program = async (input) => {
    await statement_list(input);
};

const statement_list = async (input) => {
    const statementFound = await statement(input);
    if (statementFound) {
        await statement_list(input);
    }
};

const statement = async (input) => {
    const token = input.shift();
    if (token === 'point') {
        const next = input.shift();
        console.log(memory[next]);
        return true;
    } else if (token === 'surface') {
        const fileName = input.shift();
        input.shift();
        const variableName = input.shift();
        const fileRead = fs.readFileSync(fileName, 'utf-8');
        memory[variableName] = fileRead;
        return true;
    } else if (token === 'polyline') {
        const variableName = input.shift();
        const filterType = input.shift();
        const filter = input.shift();
        input.shift();
        const into = input.shift();
        const splitByLine = memory[variableName].split('\n');
        const filtered = splitByLine.filter(line => line.indexOf(filter) !== -1);
        const joined = filtered.join('\n');
        memory[into] = joined;
        return true;
    } else if (token === 'LOOP') {
        await loop(input);
        return true;
    } else if (token === 'GET') {
        await GET(input);
        return true;
    }
    input.unshift(token);
    return false;
};

const loop = async (input) => {
    const amount = parseInt(input.shift());

    let i = 0;
    while (i++ < amount) {
        if (i === amount) {
            await statement_list(input);
        } else {
            await statement_list([...input]);
        }
        if (input[0] === 'STOP') {
            input.shift();
        }
    }
};

const GET = async (input) => {
    const url = input.shift();
    input.shift();
    variableName = input.shift();
    await fetch(url)
        .then(response => response.text())
        .then(text => memory[variableName] = text);
};

program(tokens);