toylang/dist/Parser.js

A toy programming language built with TypeScript for learning purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Parser = void 0;
var Tokenizer_1 = require("./Tokenizer");
var ASTFactories_1 = require("./ASTFactories");
var statement_1 = require("./core/statement");
var Parser = /** @class */ (function () {
    function Parser(astFactory) {
        if (astFactory === void 0) { astFactory = ASTFactories_1.DefaultASTFactory; }
        this._string = "";
        this._tokenizer = new Tokenizer_1.Tokenizer();
        this.factory = astFactory;
    }
    Parser.prototype.parse = function (string) {
        this._string = string;
        this._tokenizer.init(string);
        // prime the tokenizer by obtaining the first token (predictive parsing)
        this._lookahead = this._tokenizer.getNextToken();
        return this.Program();
    };
    Parser.prototype.Program = function () {
        return this.factory.Program(statement_1.parseStatementList(this));
    };
    Parser.prototype._eat = function (tokenType) {
        var token = this._lookahead;
        if (token === null) {
            throw new SyntaxError("Unexpected end of input, expected: \"" + tokenType + "\"");
        }
        if (token.type !== tokenType) {
            throw new SyntaxError("Unexpected token: \"" + token.value + "\", expected: \"" + tokenType + "\"");
        }
        this._lookahead = this._tokenizer.getNextToken();
        return token;
    };
    return Parser;
}());
exports.Parser = Parser;
module.exports = { Parser: Parser };