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

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

#!/usr/bin/env node
import getopts from "getopts";
import fs from "fs";
import path from "path";
import { codegen } from "./codegen";
const options = getopts(process.argv.slice(2), {
    alias: {
        help: "h",
        file: "f",
        output: "o",
        parser: "p",
        lang: "l"
    },
    default: {
        parser: "LR1",
        lang: "TS"
    }
});
if (options.help) {
    console.log("usage: pgen [-f|--file] [-o|--output] [-p|--parser] [-l|--lang]");
    process.exit(0);
}
let { file, output: outputDir, parser, lang } = options;
/* 校验 */
if (file == undefined) {
    console.log(`The option "file" is required`);
    process.exit(1);
}
else if (!fs.statSync(file).isFile()) {
    console.log(`The path doesn't exists:` + file);
    process.exit(1);
}
if (outputDir == undefined) {
    console.log(`The option "output" is required`);
    process.exit(1);
}
else if (!path.isAbsolute(outputDir)) {
    outputDir = path.resolve(process.cwd(), outputDir);
}
if (!fs.statSync(outputDir).isDirectory()) {
    console.log(`The output path doesn't exists,or isn't a directory:` + outputDir);
    process.exit(1);
}
parser = parser.toUpperCase();
let supposedParser = ["LL", "SLR", "LR1", "LALR"];
if (supposedParser.indexOf(parser) == -1) {
    console.log(`The value "${parser}" is invalid for option "parser",expected is one of ` + supposedParser.join(","));
    process.exit(1);
}
lang = lang.toUpperCase();
let supposedLang = ["TS", "JS"];
if (supposedLang.indexOf(lang) == -1) {
    console.log(`The value "${parser}" is invalid for option "parser",expected is one of ` + supposedLang.join(","));
    process.exit(1);
}
codegen({ parser, lang, outputDir, file });
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