1 /* --------------------------------------------------------------------------------------------
2 * Copyright (c) Microsoft Corporation. All rights reserved.
3 * Licensed under the MIT License. See License.txt in the project root for license information.
4 * ------------------------------------------------------------------------------------------ */
6 class FullTextDocument {
7 constructor(uri, languageId, version, content) {
9 this._languageId = languageId;
10 this._version = version;
11 this._content = content;
12 this._lineOffsets = undefined;
18 return this._languageId;
25 const start = this.offsetAt(range.start);
26 const end = this.offsetAt(range.end);
27 return this._content.substring(start, end);
31 update(changes, version) {
32 for (let change of changes) {
33 if (FullTextDocument.isIncremental(change)) {
34 // makes sure start is before end
35 const range = getWellformedRange(change.range);
37 const startOffset = this.offsetAt(range.start);
38 const endOffset = this.offsetAt(range.end);
39 this._content = this._content.substring(0, startOffset) + change.text + this._content.substring(endOffset, this._content.length);
41 const startLine = Math.max(range.start.line, 0);
42 const endLine = Math.max(range.end.line, 0);
43 let lineOffsets = this._lineOffsets;
44 const addedLineOffsets = computeLineOffsets(change.text, false, startOffset);
45 if (endLine - startLine === addedLineOffsets.length) {
46 for (let i = 0, len = addedLineOffsets.length; i < len; i++) {
47 lineOffsets[i + startLine + 1] = addedLineOffsets[i];
51 if (addedLineOffsets.length < 10000) {
52 lineOffsets.splice(startLine + 1, endLine - startLine, ...addedLineOffsets);
54 else { // avoid too many arguments for splice
55 this._lineOffsets = lineOffsets = lineOffsets.slice(0, startLine + 1).concat(addedLineOffsets, lineOffsets.slice(endLine + 1));
58 const diff = change.text.length - (endOffset - startOffset);
60 for (let i = startLine + 1 + addedLineOffsets.length, len = lineOffsets.length; i < len; i++) {
61 lineOffsets[i] = lineOffsets[i] + diff;
65 else if (FullTextDocument.isFull(change)) {
66 this._content = change.text;
67 this._lineOffsets = undefined;
70 throw new Error('Unknown change event received');
73 this._version = version;
76 if (this._lineOffsets === undefined) {
77 this._lineOffsets = computeLineOffsets(this._content, true);
79 return this._lineOffsets;
82 offset = Math.max(Math.min(offset, this._content.length), 0);
83 let lineOffsets = this.getLineOffsets();
84 let low = 0, high = lineOffsets.length;
86 return { line: 0, character: offset };
89 let mid = Math.floor((low + high) / 2);
90 if (lineOffsets[mid] > offset) {
97 // low is the least x for which the line offset is larger than the current offset
98 // or array.length if no line offset is larger than the current offset
100 return { line, character: offset - lineOffsets[line] };
103 let lineOffsets = this.getLineOffsets();
104 if (position.line >= lineOffsets.length) {
105 return this._content.length;
107 else if (position.line < 0) {
110 let lineOffset = lineOffsets[position.line];
111 let nextLineOffset = (position.line + 1 < lineOffsets.length) ? lineOffsets[position.line + 1] : this._content.length;
112 return Math.max(Math.min(lineOffset + position.character, nextLineOffset), lineOffset);
115 return this.getLineOffsets().length;
117 static isIncremental(event) {
118 let candidate = event;
119 return candidate !== undefined && candidate !== null &&
120 typeof candidate.text === 'string' && candidate.range !== undefined &&
121 (candidate.rangeLength === undefined || typeof candidate.rangeLength === 'number');
123 static isFull(event) {
124 let candidate = event;
125 return candidate !== undefined && candidate !== null &&
126 typeof candidate.text === 'string' && candidate.range === undefined && candidate.rangeLength === undefined;
129 export var TextDocument;
130 (function (TextDocument) {
132 * Creates a new text document.
134 * @param uri The document's uri.
135 * @param languageId The document's language Id.
136 * @param version The document's initial version number.
137 * @param content The document's content.
139 function create(uri, languageId, version, content) {
140 return new FullTextDocument(uri, languageId, version, content);
142 TextDocument.create = create;
144 * Updates a TextDocument by modifying its content.
146 * @param document the document to update. Only documents created by TextDocument.create are valid inputs.
147 * @param changes the changes to apply to the document.
148 * @param version the changes version for the document.
149 * @returns The updated TextDocument. Note: That's the same document instance passed in as first parameter.
152 function update(document, changes, version) {
153 if (document instanceof FullTextDocument) {
154 document.update(changes, version);
158 throw new Error('TextDocument.update: document must be created by TextDocument.create');
161 TextDocument.update = update;
162 function applyEdits(document, edits) {
163 let text = document.getText();
164 let sortedEdits = mergeSort(edits.map(getWellformedEdit), (a, b) => {
165 let diff = a.range.start.line - b.range.start.line;
167 return a.range.start.character - b.range.start.character;
171 let lastModifiedOffset = 0;
173 for (const e of sortedEdits) {
174 let startOffset = document.offsetAt(e.range.start);
175 if (startOffset < lastModifiedOffset) {
176 throw new Error('Overlapping edit');
178 else if (startOffset > lastModifiedOffset) {
179 spans.push(text.substring(lastModifiedOffset, startOffset));
181 if (e.newText.length) {
182 spans.push(e.newText);
184 lastModifiedOffset = document.offsetAt(e.range.end);
186 spans.push(text.substr(lastModifiedOffset));
187 return spans.join('');
189 TextDocument.applyEdits = applyEdits;
190 })(TextDocument || (TextDocument = {}));
191 function mergeSort(data, compare) {
192 if (data.length <= 1) {
196 const p = (data.length / 2) | 0;
197 const left = data.slice(0, p);
198 const right = data.slice(p);
199 mergeSort(left, compare);
200 mergeSort(right, compare);
204 while (leftIdx < left.length && rightIdx < right.length) {
205 let ret = compare(left[leftIdx], right[rightIdx]);
207 // smaller_equal -> take left to preserve order
208 data[i++] = left[leftIdx++];
211 // greater -> take right
212 data[i++] = right[rightIdx++];
215 while (leftIdx < left.length) {
216 data[i++] = left[leftIdx++];
218 while (rightIdx < right.length) {
219 data[i++] = right[rightIdx++];
223 function computeLineOffsets(text, isAtLineStart, textOffset = 0) {
224 const result = isAtLineStart ? [textOffset] : [];
225 for (let i = 0; i < text.length; i++) {
226 let ch = text.charCodeAt(i);
227 if (ch === 13 /* CarriageReturn */ || ch === 10 /* LineFeed */) {
228 if (ch === 13 /* CarriageReturn */ && i + 1 < text.length && text.charCodeAt(i + 1) === 10 /* LineFeed */) {
231 result.push(textOffset + i + 1);
236 function getWellformedRange(range) {
237 const start = range.start;
238 const end = range.end;
239 if (start.line > end.line || (start.line === end.line && start.character > end.character)) {
240 return { start: end, end: start };
244 function getWellformedEdit(textEdit) {
245 const range = getWellformedRange(textEdit.range);
246 if (range !== textEdit.range) {
247 return { newText: textEdit.newText, range };