@parser-generator/grammar-interpreter/lib/cjs/__tests__/if/test.js

A Parser Generator that supports LL,SLR,LR1,LALR

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const definition_1 = require("@parser-generator/definition");
const core_1 = require("@parser-generator/core");
const left_1 = __importDefault(require("./left"));
const right_1 = __importDefault(require("./right"));
/*

#GRAMMAR
S -> Stmt ;
Stmt -> If | Other <% (e)=>e[0] %> ;
If ->
    'if' Expr Stmt |
    'if' Expr Stmt 'else' Stmt
    <% (e)=> new IfStmt(e) %>;
Expr -> 'Expr' <% (e)=>e[0] %>;
Other -> 'Other' <% (e)=>e[0] %>;

#GRAMMAR
S -> Stmt ;
Stmt -> If | Other <% (e)=>e[0] %> ;
If ->
    'if' Expr Stmt |
    'if' Expr Stmt 'else' Stmt
    <% (e)=> new IfStmt(e) %>;
Expr -> 'Expr' <% (e)=>e[0] %>;
Other -> 'Other' <% (e)=>e[0] %>;

#SYMBOL_ASSOC_PREC
If left
*/
class IfStmt {
    constructor(children) {
        this.children = children;
    }
    toString() {
        return "(" + this.children.join(" ") + ")";
    }
}
exports.IfStmt = IfStmt;
class Token {
    constructor(lexeme) {
        this.lexeme = lexeme;
    }
    key() {
        return this.lexeme;
    }
    toString() {
        return this.lexeme;
    }
}
class Lexer {
    constructor(lexemes) {
        this.i = 0;
        this.lexemes = lexemes;
    }
    peek() {
        return this.i >= this.lexemes.length ? new Token(definition_1.EOF) : new Token(this.lexemes[this.i]);
    }
    next() {
        return this.i < this.lexemes.length ? new Token(this.lexemes[this.i++]) : new Token(definition_1.EOF);
    }
}
exports.parser1 = new core_1.LRParser(left_1.default);
let ast1 = exports.parser1.parse(new Lexer(["if", "Expr", "if", "Expr", "Other", "else", "Other"]));
console.log(ast1.toString());
//(if Expr (if Expr Other) else Other)
exports.parser2 = new core_1.LRParser(right_1.default);
let ast2 = exports.parser2.parse(new Lexer(["if", "Expr", "if", "Expr", "Other", "else", "Other"]));
console.log(ast2.toString());
//(if Expr (if Expr Other else Other))
//# sourceMappingURL=test.js.map