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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. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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/*
 * Copyright 2014 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.refactoring;

import com.google.auto.value.AutoValue;
import com.google.auto.value.AutoValue.CopyAnnotations;
import com.google.errorprone.annotations.Immutable;

/**
 * Class that represents a set of changes to make to the code.
 */
@AutoValue @CopyAnnotations @Immutable
public abstract class CodeReplacement {

  static CodeReplacement create(int startPosition, int length, String newContent) {
    return create(startPosition, length, newContent, "");
  }

  static CodeReplacement create(int startPosition, int length, String newContent, String sortKey) {
    return new AutoValue_CodeReplacement(startPosition, length, newContent, sortKey);
  }

  /**
   * Returns the start position within the file that the modification should be applied starting at.
   */
  public abstract int getStartPosition();

  /** Returns how many characters the new content should replace in the original content. */
  public abstract int getLength();

  /**
   * Returns the end position within the file that the modification
   * should be applied starting at.
   */
  public int getEndPosition() {
    return getStartPosition() + getLength();
  }

  /** Returns the new content that should be inserted into the file. */
  public abstract String getNewContent();

  /**
   * Returns an additional String key that can be used to sort replacements using lexical ordering.
   */
  public abstract String getSortKey();
}