Generate java class from javascript keys file

README.md

Example

generateKeys --keysPath=../keys --name="Keys" --package="app.package"

generateKeys

#!/usr/bin/env node

const argv = require('minimist')(process.argv.slice(2));
const fs = require("fs");
const path = require("path");
const changeCase = require('change-case');

const javaPackage = argv.package;
const mainClassName = argv.name || "Constants";
const keysPath = argv.keysPath || `../consts/common`;
const distPath = argv.distPath || `../dist`;
const keys = require(keysPath);

function createClass({name, obj, intent = "", isStatic = false}) {
  // name = name.replace("Keys", "").replace("Fields", "");

  name = changeCase.pascalCase(changeCase.pascalCase(name));
  name = matchAndReplace(name, "Keys");
  name = matchAndReplace(name, "Fields");

  let inner = "";
  for (let key in obj) {
    let val = obj[key];
    let varName = matchAndReplace(changeCase.constantCase(key), "_KEY$");
    if (typeof val === "string") {
      inner += `\n${intent}  public static final String ${varName} = "${val}";`;
    } else if (typeof val === "object") {
      if (Array.isArray(val)) {
        let stringify = JSON.stringify(val.map((i) => i.toString())).replace("[", "{").replace("]", "}");
        inner += `\n${intent}  public static final String[] ${varName} = ${stringify};`;
      } else
        inner += createClass({
          name: key,
          obj: val,
          intent: `${intent}  `,
          isStatic: true,
        });
    }
  }

  function matchAndReplace(str, regex) {
    if (str.match(new RegExp(`.+${regex}`)))
      str = str.replace(new RegExp(regex), "");
    return str;
  }

  let template = `${!isStatic && javaPackage ? `package ${javaPackage};` : ""}

${intent}public ${isStatic ? "static " : ""}class ${name} {
${inner}
${intent}}`;
  return inner.trim() ? template : "";
}


const javaText = createClass({name: mainClassName, obj: keys});

fs.writeFile(path.resolve(__dirname, distPath, `${mainClassName}.java`), javaText, (err) => {
  console.log(err || "done");
});

Keys.java

package app.package;

public class Keys {

  public static final String USER_NAME = "username";

  public static class Post {

    public static final String TITLE = "post_title";
  }
}

keys.js

module.exports = {

  USER_NAME: "username",
  post: {
    title: "post_title",
  }

};