bds.js/lib/Environment.js

A simple interpreter written to simulate and run BDScript Language in JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Environment = void 0;
class Environment {
    constructor(parent) {
        this.parent = parent;
        this.cache = new Map();
        this.constant = new Map();
        if (parent && !(parent instanceof Environment))
            throw new Error("parent env must be instanceof Environment!");
    }
    /**
     * Sets a key-value into cache
     * @param name
     * @param value
     * @returns
     */
    set(name, value) {
        this.cache.set(name, value);
        return void 0;
    }
    ;
    const() { }
    ;
    /**
     * Returns value by key from cache
     * @param name
     * @returns
     */
    get(name) {
        return this._recursiveGet(name);
    }
    ;
    _get(name) {
        return (this.cache.has(name) ? this.cache.get(name) ?? null : void 0);
    }
    /**
     * Remove value by key from cache
     * @param name
     * @returns
     */
    remove(name) {
        return this.cache.delete(name);
    }
    ;
    /**
     * Recursively get from Environment to Environment
     * @param name
     * @returns
     */
    _recursiveGet(name) {
        let env = this;
        while (true) {
            try {
                let res = env._get(name);
                if (res === void 0)
                    throw new Error(`Identifier ${name} is not defined`);
                return res;
            }
            catch (err) {
                if (env?.parent) {
                    env = env.parent;
                    continue;
                }
                throw err /*undefined*/;
            }
        }
    }
}
exports.Environment = Environment;