monaco-editor-core
Version:
A browser based code editor
138 lines (137 loc) • 5.73 kB
JavaScript
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as strings from '../../../../base/common/strings.js';
import { StringBuffer, createLineStarts, createLineStartsFast } from './pieceTreeBase.js';
import { PieceTreeTextBuffer } from './pieceTreeTextBuffer.js';
class PieceTreeTextBufferFactory {
constructor(_chunks, _bom, _cr, _lf, _crlf, _containsRTL, _containsUnusualLineTerminators, _isBasicASCII, _normalizeEOL) {
this._chunks = _chunks;
this._bom = _bom;
this._cr = _cr;
this._lf = _lf;
this._crlf = _crlf;
this._containsRTL = _containsRTL;
this._containsUnusualLineTerminators = _containsUnusualLineTerminators;
this._isBasicASCII = _isBasicASCII;
this._normalizeEOL = _normalizeEOL;
}
_getEOL(defaultEOL) {
const totalEOLCount = this._cr + this._lf + this._crlf;
const totalCRCount = this._cr + this._crlf;
if (totalEOLCount === 0) {
// This is an empty file or a file with precisely one line
return (defaultEOL === 1 /* DefaultEndOfLine.LF */ ? '\n' : '\r\n');
}
if (totalCRCount > totalEOLCount / 2) {
// More than half of the file contains \r\n ending lines
return '\r\n';
}
// At least one line more ends in \n
return '\n';
}
create(defaultEOL) {
const eol = this._getEOL(defaultEOL);
const chunks = this._chunks;
if (this._normalizeEOL &&
((eol === '\r\n' && (this._cr > 0 || this._lf > 0))
|| (eol === '\n' && (this._cr > 0 || this._crlf > 0)))) {
// Normalize pieces
for (let i = 0, len = chunks.length; i < len; i++) {
const str = chunks[i].buffer.replace(/\r\n|\r|\n/g, eol);
const newLineStart = createLineStartsFast(str);
chunks[i] = new StringBuffer(str, newLineStart);
}
}
const textBuffer = new PieceTreeTextBuffer(chunks, this._bom, eol, this._containsRTL, this._containsUnusualLineTerminators, this._isBasicASCII, this._normalizeEOL);
return { textBuffer: textBuffer, disposable: textBuffer };
}
}
export class PieceTreeTextBufferBuilder {
constructor() {
this.chunks = [];
this.BOM = '';
this._hasPreviousChar = false;
this._previousChar = 0;
this._tmpLineStarts = [];
this.cr = 0;
this.lf = 0;
this.crlf = 0;
this.containsRTL = false;
this.containsUnusualLineTerminators = false;
this.isBasicASCII = true;
}
acceptChunk(chunk) {
if (chunk.length === 0) {
return;
}
if (this.chunks.length === 0) {
if (strings.startsWithUTF8BOM(chunk)) {
this.BOM = strings.UTF8_BOM_CHARACTER;
chunk = chunk.substr(1);
}
}
const lastChar = chunk.charCodeAt(chunk.length - 1);
if (lastChar === 13 /* CharCode.CarriageReturn */ || (lastChar >= 0xD800 && lastChar <= 0xDBFF)) {
// last character is \r or a high surrogate => keep it back
this._acceptChunk1(chunk.substr(0, chunk.length - 1), false);
this._hasPreviousChar = true;
this._previousChar = lastChar;
}
else {
this._acceptChunk1(chunk, false);
this._hasPreviousChar = false;
this._previousChar = lastChar;
}
}
_acceptChunk1(chunk, allowEmptyStrings) {
if (!allowEmptyStrings && chunk.length === 0) {
// Nothing to do
return;
}
if (this._hasPreviousChar) {
this._acceptChunk2(String.fromCharCode(this._previousChar) + chunk);
}
else {
this._acceptChunk2(chunk);
}
}
_acceptChunk2(chunk) {
const lineStarts = createLineStarts(this._tmpLineStarts, chunk);
this.chunks.push(new StringBuffer(chunk, lineStarts.lineStarts));
this.cr += lineStarts.cr;
this.lf += lineStarts.lf;
this.crlf += lineStarts.crlf;
if (!lineStarts.isBasicASCII) {
// this chunk contains non basic ASCII characters
this.isBasicASCII = false;
if (!this.containsRTL) {
this.containsRTL = strings.containsRTL(chunk);
}
if (!this.containsUnusualLineTerminators) {
this.containsUnusualLineTerminators = strings.containsUnusualLineTerminators(chunk);
}
}
}
finish(normalizeEOL = true) {
this._finish();
return new PieceTreeTextBufferFactory(this.chunks, this.BOM, this.cr, this.lf, this.crlf, this.containsRTL, this.containsUnusualLineTerminators, this.isBasicASCII, normalizeEOL);
}
_finish() {
if (this.chunks.length === 0) {
this._acceptChunk1('', true);
}
if (this._hasPreviousChar) {
this._hasPreviousChar = false;
// recreate last chunk
const lastChunk = this.chunks[this.chunks.length - 1];
lastChunk.buffer += String.fromCharCode(this._previousChar);
const newLineStarts = createLineStartsFast(lastChunk.buffer);
lastChunk.lineStarts = newLineStarts;
if (this._previousChar === 13 /* CharCode.CarriageReturn */) {
this.cr++;
}
}
}
}