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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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/*
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Rhino code, released
 * May 6, 1999.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1997-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Nick Santos
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (the "GPL"), in which
 * case the provisions of the GPL are applicable instead of those above. If
 * you wish to allow use of your version of this file only under the terms of
 * the GPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replacing
 * them with the notice and other provisions required by the GPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

package com.google.javascript.rhino;

/**
 * The {@code StaticSourceFile} contains information about a compiler input.
 *
 * @author [email protected] (Nick Santos)
 */
public interface StaticSourceFile {

  /** Source kinds. */
  public enum SourceKind {
    /** A file whose contents are necessary both for type checking and emitting code. */
    STRONG,
    /** A file whose contents are necessary for type checking only. */
    WEAK,
    /** A file whose contents are extern declarations. */
    EXTERN,
    /** A file that is not part of the compilation unit and is not strong, weak, or an extern */
    NON_CODE,
  }

  /**
   * The name of the file. Must be unique across all files in the compilation.
   */
  String getName();

  /** The source kind. */
  SourceKind getKind();

  /** Whether the source kind is STRONG. */
  default boolean isStrong() {
    return getKind() == SourceKind.STRONG;
  }

  /** Whether the source kind is WEAK. */
  default boolean isWeak() {
    return getKind() == SourceKind.WEAK;
  }

  /** Whether the source kind is EXTERN. */
  default boolean isExtern() {
    return getKind() == SourceKind.EXTERN;
  }

  /**
   * Returns the offset of the given line number relative to the file start.
   * Line number should be 1-based.
   *
   * If the source file doesn't have line information, it should return
   * Integer.MIN_VALUE. The negative offsets will make it more obvious
   * what happened.
   *
   * @param lineNumber the line of the input to get the absolute offset of.
   * @return the absolute offset of the start of the provided line.
   * @throws IllegalArgumentException if lineno is less than 1 or greater than
   *         the number of lines in the source.
   */
  int getLineOffset(int lineNumber);

  /**
   * Gets the 1-based line number of the given source offset.
   *
   * @param offset An absolute file offset.
   * @return The 1-based line number of that offset. The behavior is
   *     undefined if this offset does not exist in the source file.
   */
  int getLineOfOffset(int offset);

  /**
   * Gets the 0-based column number of the given source offset.
   *
   * @param offset An absolute file offset.
   * @return The 0-based column number of that offset. The behavior is
   *     undefined if this offset does not exist in the source file.
   */
  int getColumnOfOffset(int offset);
}