toylang/dist/Environment.js

A toy programming language built with TypeScript for learning purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Environment = void 0;
var RuntimeError_1 = require("./RuntimeError");
var Environment = /** @class */ (function () {
    function Environment(enclosing) {
        if (enclosing === void 0) { enclosing = null; }
        this.values = new Map();
        this.enclosing = enclosing;
    }
    Environment.prototype.add = function (name, value) {
        this.values.set(name, value);
    };
    Environment.prototype.remove = function (name) {
        this.values.delete(name);
    };
    Environment.prototype.get = function (name) {
        var _a;
        if (this.values.has(name)) {
            return this.values.get(name);
        }
        if (this.enclosing !== null) {
            return (_a = this.enclosing) === null || _a === void 0 ? void 0 : _a.get(name);
        }
        throw new RuntimeError_1.RuntimeError(name, "Undeclared variable \"" + name + "\"");
    };
    Environment.prototype.assign = function (name, value) {
        var _a;
        if (this.values.has(name)) {
            this.values.set(name, value);
            return;
        }
        if (this.enclosing !== null) {
            (_a = this.enclosing) === null || _a === void 0 ? void 0 : _a.assign(name, value);
            return;
        }
        throw new RuntimeError_1.RuntimeError(name, "Undeclared variable \"" + name + "\"");
    };
    return Environment;
}());
exports.Environment = Environment;