eggtended-js

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const utils = require("../utils.js"); const { SpecialForms } = require("./environment.js"); class Value { constructor(token) { this.type = "value"; this.value = token.value; } evaluate() { return this.value; } } class Word { constructor(token) { this.type = "word"; this.name = token.value; } evaluate(env) { // Variable if (this.name in env) { return env[this.name]; // Object variable referenced without using 'this' } else if ("this" in env && this.name in env["this"]) { return env["this"][this.name]; } else { throw new ReferenceError(`Undefined variable: ${this.name}`); } } } class Apply { constructor(expr) { this.type = "apply"; this.operator = expr; this.args = []; } evaluate(env) { // Check if its a specialForm function if (this.operator.type === "word" && this.operator.name in SpecialForms) { return SpecialForms[this.operator.name](this.args, env); } // Evaluated operator let op = this.operator.evaluate(env); // Evaluated arguments let evArgs = this.args.map(arg => arg.evaluate(env)); if (typeof op === "function") { // Is a function return op(...evArgs); } if (typeof op !== "undefined") { // Is an object, number, string or boolean let name = evArgs[0]; let methodArgs = evArgs.slice(1); // Check if the name of the method/property is defined on the object if (typeof op[name] !== "undefined") { // Execute as function if (typeof op[name] === "function") { return op[name](...methodArgs); // Return as property } else { return op[name]; } // If the name of the method is not defined on the object... } else { // Check if its a Map property. if (op instanceof Map) { if (typeof op.get(name) === "function") { return op.get(name)(...methodArgs); } else { return op.get(name); } } // Try to call the 'missing' method if (typeof op["__missing__"] === "function") { return op["__missing__"](...methodArgs); // As a last resort, throw an Exception } else { throw new SyntaxError(`The method '${name}' was not found on the object '${utils.ins(op)}'`); } } } throw new TypeError(`Could not resolve the apply expression`); } } class Regex { constructor(token) { this.type = "regex"; this.body = token.body; this.flags = token.flags; } evaluate() { return new xRegExp(this.body, this.flags); } } module.exports = { Value, Word, Apply, Regex }; </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>