text: /*
   * Copyright (C) 2013 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  import * as TextUtils from '../text_utils/text_utils.js';
  
  /**
   * @param {!TextUtils.TextRange.TextRange} range
   * @return {!{start: *, end: *}} // {start: !CodeMirror.Pos, end: !CodeMirror.Pos}
   */
  export function toPos(range) {
    return {
      start: new CodeMirror.Pos(range.startLine, range.startColumn),
      end: new CodeMirror.Pos(range.endLine, range.endColumn)
    };
  }
  
  /**
   * @param {*} start // !CodeMirror.Pos
   * @param {*} end // !CodeMirror.Pos
   * @return {!TextUtils.TextRange.TextRange}
   */
  export function toRange(start, end) {
    return new TextUtils.TextRange.TextRange(start.line, start.ch, end.line, end.ch);
  }
  
  /**
   * @param {*} changeObject (!CodeMirror.ChangeObject)
   * @return {{oldRange: !TextUtils.TextRange.TextRange, newRange: !TextUtils.TextRange.TextRange}}
   */
  export function changeObjectToEditOperation(changeObject) {
    const oldRange = toRange(changeObject.from, changeObject.to);
    const newRange = oldRange.clone();
    const linesAdded = changeObject.text.length;
    if (linesAdded === 0) {
      newRange.endLine = newRange.startLine;
      newRange.endColumn = newRange.startColumn;
    } else if (linesAdded === 1) {
      newRange.endLine = newRange.startLine;
      newRange.endColumn = newRange.startColumn + changeObject.text[0].length;
    } else {
      newRange.endLine = newRange.startLine + linesAdded - 1;
      newRange.endColumn = changeObject.text[linesAdded - 1].length;
    }
    return {oldRange: oldRange, newRange: newRange};
  }
  
  /**
   * @param {!CodeMirror} codeMirror
   * @param {number} linesCount
   * @return {!Array.<string>}
   */
  export function pullLines(codeMirror, linesCount) {
    /** @type {!Array.<string>} */
    const lines = [];
    // @ts-expect-error CodeMirror types do not specify eachLine.
    codeMirror.eachLine(0, linesCount, onLineHandle);
    return lines;
  
    /**
     * @param {!{text: string}} lineHandle
     */
    function onLineHandle(lineHandle) {
      lines.push(lineHandle.text);
    }
  }
  
  /**
   * @implements {TextUtils.TextUtils.TokenizerFactory}
   * @unrestricted
   */
  export class TokenizerFactory {
    /**
     * @override
     * @param {string} mimeType
     * @return {function(string, function(string, ?string, number, number))}
     */
    createTokenizer(mimeType) {
      const mode = CodeMirror.getMode({indentUnit: 2}, mimeType);
      const state = CodeMirror.startState(mode);
      /**
       * @param {string} line
       * @param {function(string, (string|null), number, number):void} callback
       */
      function tokenize(line, callback) {
        const stream = new CodeMirror.StringStream(line);
        while (!stream.eol()) {
          // @ts-expect-error CodeMirror types specify token as optional.
          const style = mode.token(stream, state);
          const value = stream.current();
          callback(value, style, stream.start, stream.start + value.length);
          stream.start = stream.pos;
        }
      }
      return tokenize;
    }
  }
  