blob: 4f02fbdd3ed030b8e605b4059621d80338ebcea2 [file] [log] [blame]
// Copyright 2016 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 Text {
/**
* @param {string} value
*/
constructor(value) {
this._value = value;
}
/**
* @return {!Array<number>}
*/
lineEndings() {
if (!this._lineEndings) {
this._lineEndings = this._value.computeLineEndings();
}
return this._lineEndings;
}
/**
* @return {string}
*/
value() {
return this._value;
}
/**
* @return {number}
*/
lineCount() {
const lineEndings = this.lineEndings();
return lineEndings.length;
}
/**
* @param {number} lineNumber
* @param {number} columnNumber
* @return {number}
*/
offsetFromPosition(lineNumber, columnNumber) {
return (lineNumber ? this.lineEndings()[lineNumber - 1] + 1 : 0) + columnNumber;
}
/**
* @param {number} offset
* @return {!TextUtils.Text.Position}
*/
positionFromOffset(offset) {
const lineEndings = this.lineEndings();
const lineNumber = lineEndings.lowerBound(offset);
return {lineNumber: lineNumber, columnNumber: offset - (lineNumber && (lineEndings[lineNumber - 1] + 1))};
}
/**
* @return {string}
*/
lineAt(lineNumber) {
const lineEndings = this.lineEndings();
const lineStart = lineNumber > 0 ? lineEndings[lineNumber - 1] + 1 : 0;
const lineEnd = lineEndings[lineNumber];
let lineContent = this._value.substring(lineStart, lineEnd);
if (lineContent.length > 0 && lineContent.charAt(lineContent.length - 1) === '\r') {
lineContent = lineContent.substring(0, lineContent.length - 1);
}
return lineContent;
}
/**
* @param {!TextUtils.TextRange} range
* @return {!TextUtils.SourceRange}
*/
toSourceRange(range) {
const start = this.offsetFromPosition(range.startLine, range.startColumn);
const end = this.offsetFromPosition(range.endLine, range.endColumn);
return new TextUtils.SourceRange(start, end - start);
}
/**
* @param {!TextUtils.SourceRange} sourceRange
* @return {!TextUtils.TextRange}
*/
toTextRange(sourceRange) {
const cursor = new TextCursor(this.lineEndings());
const result = TextUtils.TextRange.createFromLocation(0, 0);
cursor.resetTo(sourceRange.offset);
result.startLine = cursor.lineNumber();
result.startColumn = cursor.columnNumber();
cursor.advance(sourceRange.offset + sourceRange.length);
result.endLine = cursor.lineNumber();
result.endColumn = cursor.columnNumber();
return result;
}
/**
* @param {!TextUtils.TextRange} range
* @param {string} replacement
* @return {string}
*/
replaceRange(range, replacement) {
const sourceRange = this.toSourceRange(range);
return this._value.substring(0, sourceRange.offset) + replacement +
this._value.substring(sourceRange.offset + sourceRange.length);
}
/**
* @param {!TextUtils.TextRange} range
* @return {string}
*/
extract(range) {
const sourceRange = this.toSourceRange(range);
return this._value.substr(sourceRange.offset, sourceRange.length);
}
}
/**
* @unrestricted
*/
export class TextCursor {
/**
* @param {!Array<number>} 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;
}
}
/* Legacy exported object */
self.TextUtils = self.TextUtils || {};
/* Legacy exported object */
TextUtils = TextUtils || {};
/** @constructor */
TextUtils.Text = Text;
/** @constructor */
TextUtils.TextCursor = TextCursor;
/** @typedef {{lineNumber: number, columnNumber: number}} */
TextUtils.Text.Position;