META-INF.dirigible.dev-tools.text_utils.TextCursor.js Maven / Gradle / Ivy
// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @unrestricted
*/
export class TextCursor {
/**
* @param {!Array} lineEndings
*/
constructor(lineEndings) {
this._lineEndings = lineEndings;
this._offset = 0;
this._lineNumber = 0;
this._columnNumber = 0;
}
/**
* @param {number} offset
*/
advance(offset) {
this._offset = offset;
while (this._lineNumber < this._lineEndings.length && this._lineEndings[this._lineNumber] < this._offset) {
++this._lineNumber;
}
this._columnNumber = this._lineNumber ? this._offset - this._lineEndings[this._lineNumber - 1] - 1 : this._offset;
}
/**
* @return {number}
*/
offset() {
return this._offset;
}
/**
* @param {number} offset
*/
resetTo(offset) {
this._offset = offset;
this._lineNumber = this._lineEndings.lowerBound(offset);
this._columnNumber = this._lineNumber ? this._offset - this._lineEndings[this._lineNumber - 1] - 1 : this._offset;
}
/**
* @return {number}
*/
lineNumber() {
return this._lineNumber;
}
/**
* @return {number}
*/
columnNumber() {
return this._columnNumber;
}
}