eggtended-js

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const utils = require("../utils.js"); const { SymbolTable } = require("./symboltable.js"); // specialForms and topEnv maps const SpecialForms = Object.create(null); const TopEnv = Object.create(null); SpecialForms["if"] = (args, env) => { if (args.length !== 3) { throw new SyntaxError("Bad number of args passed to if"); } if (args[0].evaluate(env) === true) { return args[1].evaluate(env); } else { return args[2].evaluate(env); } }; SpecialForms["while"] = (args, env) => { if (args.length !== 2) { throw new SyntaxError("Bad number of args passed to while"); } while (args[0].evaluate(env) === true) { args[1].evaluate(env); } // Egg has no undefined so we return false when there's no meaningful result return false; }; SpecialForms["for"] = (args, env) => { if (args.length !== 4) { throw new SyntaxError("Bad number of args passed to for"); } const forEnv = Object.create(env); forEnv["__symbol__"] = new SymbolTable(); // Variable args[0].evaluate(forEnv); // Condition while (args[1].evaluate(forEnv) === true) { // Body args[3].evaluate(forEnv); // Increment args[2].evaluate(forEnv); } return false; }; SpecialForms["foreach"] = (args, env) => { if (args.length !== 3) { throw new SyntaxError("Bad number of args passed to foreach"); } if (args[0].type !== "word") { throw new SyntaxError("The first argument to foreach must be a valid word"); } const localEnv = Object.create(env); localEnv["__symbol__"] = new SymbolTable(); const iterable = args[1].evaluate(localEnv); for (const val of iterable) { localEnv[args[0].name] = val; args[2].evaluate(localEnv); } return false; }; SpecialForms["do"] = (args, env) => { let value = false; args.forEach(arg => { value = arg.evaluate(env); }); return value; }; SpecialForms["def"] = SpecialForms["define"] = SpecialForms[":="] = (args, env) => { if (args.length !== 2) { throw new SyntaxError("Bad use of define"); } // Value to assign to the variable let value = args[1].evaluate(env); // Variable name let valName = args[0].name; env[valName] = value; return value; }; SpecialForms["fun"] = SpecialForms["->"] = (args, env) => { if (!args.length) { throw new SyntaxError("Functions need a body."); } function name(expr) { if (expr.type !== "word") { throw new SyntaxError("Arg names must be words"); } return expr.name; } let argNames = args.slice(0, args.length - 1).map(name); let body = args[args.length - 1]; return function() { if (arguments.length !== argNames.length) { throw new TypeError("Wrong number of arguments"); } const localEnv = Object.create(env); localEnv["__symbol__"] = new SymbolTable(); for (let i = 0; i < arguments.length; i++) { localEnv[argNames[i]] = arguments[i]; } return body.evaluate(localEnv); }; }; SpecialForms["set"] = SpecialForms["="] = (args, env) => { if (args[0].type !== "word") { throw new SyntaxError("Bad use of set"); } let valName = args[0].name; let indices = args.slice(1, -1).map(arg => arg.evaluate(env)); let value = args[args.length - 1].evaluate(env); for (let scope = env; scope; scope = Object.getPrototypeOf(scope)) { if (scope["__symbol__"].checkAttribute("const", valName)) { throw new ReferenceError(`Trying to change 'const' variable ${args[0].name}`); } // TODO: Reduce code duplication if ("this" in scope) { // TODO: use hasOwnProperty ? if (Object.prototype.hasOwnProperty.call(scope["this"], valName)) { if (indices.length === 0) { scope["this"][valName] = value; } else { scope["this"][valName].setelem(value, ...indices); } return value; } } if (Object.prototype.hasOwnProperty.call(scope, valName)) { if (indices.length === 0) { scope[valName] = value; } else { scope[valName].setelem(value, ...indices); } return value; } } throw new ReferenceError(`Tried setting an undefined variable: ${valName}`); }; SpecialForms["object"] = (args, env) => { // Create a new object and a new scope const object = {}; const objectEnv = Object.create(env); objectEnv["__symbol__"] = new SymbolTable(); // Add the variable 'this' as a reference to the current object objectEnv["this"] = object; // Evaluate the arguments and add the methods/properties to the object const evArgs = args.map(arg => arg.evaluate(objectEnv)); for (const pair of utils.chunk(evArgs, 2)) { const name = pair[0]; const value = pair[1]; object[name] = value; } return object; }; // TODO: Continue implementing class? // // SpecialForms['class'] = (args, env) => { // // const evArgs = args.map((arg) => evaluate(arg, env)); // // const newClass = function(x, y) { // this.x = x; // this.y = y; // } // // return newClass; // } ["+", "-", "*", "/", "==", "!=", "<", ">", ">=", "<=", "&&", "||"].forEach(op => { TopEnv[op] = new Function("a, b", `return a ${op} b;`); }); TopEnv["true"] = true; TopEnv["false"] = false; TopEnv["null"] = null; TopEnv["print"] = value => { console.log(value); return value; }; TopEnv["arr"] = TopEnv["array"] = (...args) => { return args; }; TopEnv["map"] = TopEnv["dict"] = (...args) => { return new Map(utils.chunk(args, 2)); }; TopEnv["<-"] = TopEnv["[]"] = TopEnv["element"] = (object, ...indices) => { return object.sub(...indices); }; TopEnv["length"] = array => { return array.length; }; TopEnv["RegExp"] = (method, ...args) => { return xRegExp[method](...args); }; TopEnv["child"] = parent => { return Object.create(parent); }; TopEnv["__symbol__"] = new SymbolTable(); // WIP: Continue implementing class? // TopEnv['new'] = (...args) => { // const className = args[0]; // // // TODO: Check for more exceptions // if(typeof className !== "function") { // throw new SyntaxError(`${className} must be a class with a constructor.`) // } // // return new className(...args.slice(1)); // module.exports = { SpecialForms, TopEnv }; </code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc(1.1.0)<img src="./image/esdoc-logo-mini-black.png"></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>