Marc
117 lines
3.0 KiB
JavaScript
117 lines
3.0 KiB
JavaScript
//@ts-check
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const { Lexer } = require('../lib/sheebr/lexer')
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const { getline } = require('../lib/sheebr/utils')
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const fs = require('fs')
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let environment = require('../lib/sheebr/environment')
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let aliases = require("../lib/sheebr/aliases")
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const { startjs } = require('../../core/hook')
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let current_dir = process.cwd()
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start()
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async function start(){
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while(true){
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const input = await getline("sheebr> ");
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if(input === "exit") break;
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if(!input) continue;
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else await evaluate(input);
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}
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}
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/**
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* @param { string } input
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* @returns
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*/
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async function evaluate(input){
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let lexer = new Lexer(input)
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let args = lexer.scanTokens()
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args = evaluateAliases(args)
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args = evaluateEnvironmentVariables(args);
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switch(args[0]){
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case "cd":
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if(args.length != 2){
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console.log("Wrong number of arguments"); return;}
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if(!fs.existsSync(args[1])){console.log("Folder does not exist"); return;}
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current_dir = args[1][0] == "/" ? args[1] : current_dir + '/' + args[1];
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//console.log(current_dir)
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break;
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case "set":
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environment[args[1]] = args[2];
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break;
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case "alias":
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if(args.length == 1) console.log(aliases);
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else if(args.length == 2){
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console.error("Wrong number of argument")
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}
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else{
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aliases[args[1]] = args[2].split(" ")
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}
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break;
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case "clear":
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console.clear();
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break;
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default:
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await evaluateProgram(args)
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}
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}
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/**
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* @param {string[]} args
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*/
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async function evaluateProgram(args){
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let found = false;
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for(let path of environment.path.split(':')){
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let tobreak = false;
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const files = fs.readdirSync(path);
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if(files.includes(`${args[0]}.js`)){
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found = true;
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try {
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const cmd = `${path + '/' + args[0]}.js`
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const options = {cwd: current_dir, env: environment, shell: true}
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await startjs(cmd, args, options)
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tobreak = true;
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} catch(e) {
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console.log("Program crashed")
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}
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}
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if(tobreak) break;
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}
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if(!found){
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console.log("Program not found")
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}
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}
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/**
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* @param {string[]} args
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* @returns
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*/
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function evaluateEnvironmentVariables(args){
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let newArgs = []
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for(let arg of args){
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if(arg.startsWith('$')){
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if (arg.slice(1) in environment)
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newArgs.push(JSON.stringify(environment[arg.slice(1)]));
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else
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console.error(`variable ${arg.slice(1)} does not exist.`);
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}
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else{
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newArgs.push(arg)
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}
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}
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return newArgs;
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}
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/**
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* @param { string[] } args
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* @returns
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*/
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function evaluateAliases(args){
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if(args[0] in aliases){
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return aliases[args[0]].concat(args.slice(1))
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}
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return args;
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} |