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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2015 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.javascript.jscomp;

import java.io.Serializable;
import java.util.Set;
import org.jspecify.nullness.Nullable;

/** A class that generates unique JavaScript variable/property names. */
public interface NameGenerator extends Serializable {

  /**
   * Reconfigures this NameGenerator, and resets it to the initial state.
   *
   * @param reservedNames set of names that are reserved; generated names will not include these
   *     names. This set is referenced rather than copied, so changes to the set will be reflected
   *     in how names are generated.
   * @param prefix all generated names begin with this prefix.
   * @param reservedCharacters If specified these characters won't be used in generated names
   */
  void reset(Set reservedNames, String prefix, char @Nullable [] reservedCharacters);

  /**
   * Reconfigures this NameGenerator, and resets it to the initial state.
   *
   * @param reservedNames set of names that are reserved; generated names will not include these
   *     names. This set is referenced rather than copied, so changes to the set will be reflected
   *     in how names are generated.
   * @param prefix all generated names begin with this prefix.
   * @param reservedFirstCharacters If specified these characters won't be used as the first
   *     character in generated names
   * @param reservedNonFirstCharacters If specified these characters won't be used for characters
   *     (after the first) in generated names
   */
  void reset(
      Set reservedNames,
      String prefix,
      char @Nullable [] reservedFirstCharacters,
      char @Nullable [] reservedNonFirstCharacters);

  /** Returns a clone of this NameGenerator, reconfigured and reset. */
  NameGenerator clone(
      Set reservedNames, String prefix, char @Nullable [] reservedCharacters);

  /** Generates the next name. */
  public String generateNextName();
}