@parser-generator/cli/lib/esm/codegen.js

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

import webpack from "webpack";
import HtmlWebpackPlugin from "html-webpack-plugin";
import fs from "fs";
import path from "path";
import { genParser, adapter } from "@parser-generator/grammar-interpreter";
const TEMPLATE_PATH = path.resolve(__dirname, "./template/index.html");
const LR_ENTRY_PATH = path.resolve(__dirname, "./template/lr.js");
const LL_ENTRY_PATH = path.resolve(__dirname, "./template/ll.js");
export function codegen({ parser, lang, outputDir, file }) {
    /*************************************** 生成代码文件 ****************************************/
    let rawGrammar = fs.readFileSync(file, { encoding: "utf-8" });
    let { code, grammar, firstTable, followTable, lrTable, lrAutomata } = genParser(rawGrammar, { parser, lang });
    //1. 生成parser
    let ext = lang == "TS" ? ".ts" : ".js";
    fs.writeFileSync(path.resolve(outputDir, "parser" + ext), code);
    //2.生成模版
    let tmplData = { prods: grammar.productions(), first: undefined, follow: undefined, lrTable: undefined, lrAutomata: undefined };
    if (firstTable != undefined)
        tmplData.first = adapter.firstTableToDimArr(firstTable);
    if (followTable != undefined)
        tmplData.follow = adapter.followTableToDimArr(followTable);
    if (lrTable != undefined)
        tmplData.lrTable = adapter.lrTableToDimArr(lrTable);
    if (lrAutomata != undefined)
        tmplData.lrAutomata = JSON.stringify(adapter.lrAutomataToGraph(lrAutomata));
    let entry = parser == "LL" ? LL_ENTRY_PATH : LR_ENTRY_PATH;
    webpack({
        mode: "production",
        // stats: "verbose",
        entry,
        output: { path: outputDir },
        plugins: [
            new HtmlWebpackPlugin({
                inject: true,
                templateParameters: tmplData,
                template: TEMPLATE_PATH,
            }),
            new webpack.BannerPlugin(`Copyright (c) 2019 light
			Licensed under the MIT License (MIT), see
			https://github.com/light0x00/parser-generator`),
        ]
    }, (err, stats) => {
        if (err) {
            console.error(err.stack || err);
        }
        if (stats.hasWarnings() || stats.hasErrors())
            console.log(stats.toString({ colors: true }));
    });
}
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