prepack/lib/utils/NameGenerator.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.NameGenerator = void 0;

var _invariant = _interopRequireDefault(require("../invariant.js"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
function escapeInvalidIdentifierCharacters(s) {
  let res = "";

  for (let c of s) if (c >= "0" && c <= "9" || c >= "a" && c <= "z" || c >= "A" && c <= "Z") res += c;else res += "_" + c.charCodeAt(0);

  return res;
}

const base62characters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

function base62encode(n) {
  (0, _invariant.default)((n | 0) === n && n >= 0);
  if (n === 0) return "0";
  let s = "";

  while (n > 0) {
    let f = n % base62characters.length;
    s = base62characters[f] + s;
    n = (n - f) / base62characters.length;
  }

  return s;
}

class NameGenerator {
  constructor(forbiddenNames, debugNames, uniqueSuffix, prefix) {
    this.prefix = prefix;
    this.uidCounter = 0;
    this.debugNames = debugNames;
    this.forbiddenNames = forbiddenNames;
    this.uniqueSuffix = uniqueSuffix;
  }

  generate(debugSuffix) {
    let id;

    do {
      id = this.prefix + base62encode(this.uidCounter++);
      if (this.uniqueSuffix.length > 0) id += this.uniqueSuffix;

      if (this.debugNames) {
        if (debugSuffix) id += "_" + escapeInvalidIdentifierCharacters(debugSuffix);else id += "_";
      }
    } while (this.forbiddenNames.has(id));

    return id;
  }

}

exports.NameGenerator = NameGenerator;
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