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indentRangeProvider.ts
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indentRangeProvider.ts
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { ITextModel } from 'vs/editor/common/model';
import { FoldingMarkers } from 'vs/editor/common/modes/languageConfiguration';
import { FoldingRegions, MAX_LINE_NUMBER } from 'vs/editor/contrib/folding/foldingRanges';
import { TextModel } from 'vs/editor/common/model/textModel';
import { RangeProvider } from './folding';
import { LanguageConfigurationRegistry } from 'vs/editor/common/modes/languageConfigurationRegistry';
import { CancellationToken } from 'vs/base/common/cancellation';
const MAX_FOLDING_REGIONS_FOR_INDENT_LIMIT = 5000;
export const ID_INDENT_PROVIDER = 'indent';
export class IndentRangeProvider implements RangeProvider {
readonly id = ID_INDENT_PROVIDER;
constructor(private readonly editorModel: ITextModel) {
}
dispose() {
}
compute(cancelationToken: CancellationToken): Promise<FoldingRegions> {
let foldingRules = LanguageConfigurationRegistry.getFoldingRules(this.editorModel.getLanguageIdentifier().id);
let offSide = foldingRules && !!foldingRules.offSide;
let markers = foldingRules && foldingRules.markers;
return Promise.resolve(computeRanges(this.editorModel, offSide, markers));
}
}
// public only for testing
export class RangesCollector {
private readonly _startIndexes: number[];
private readonly _endIndexes: number[];
private readonly _indentOccurrences: number[];
private _length: number;
private readonly _foldingRangesLimit: number;
constructor(foldingRangesLimit: number) {
this._startIndexes = [];
this._endIndexes = [];
this._indentOccurrences = [];
this._length = 0;
this._foldingRangesLimit = foldingRangesLimit;
}
public insertFirst(startLineNumber: number, endLineNumber: number, indent: number) {
if (startLineNumber > MAX_LINE_NUMBER || endLineNumber > MAX_LINE_NUMBER) {
return;
}
let index = this._length;
this._startIndexes[index] = startLineNumber;
this._endIndexes[index] = endLineNumber;
this._length++;
if (indent < 1000) {
this._indentOccurrences[indent] = (this._indentOccurrences[indent] || 0) + 1;
}
}
public toIndentRanges(model: ITextModel) {
if (this._length <= this._foldingRangesLimit) {
// reverse and create arrays of the exact length
let startIndexes = new Uint32Array(this._length);
let endIndexes = new Uint32Array(this._length);
for (let i = this._length - 1, k = 0; i >= 0; i--, k++) {
startIndexes[k] = this._startIndexes[i];
endIndexes[k] = this._endIndexes[i];
}
return new FoldingRegions(startIndexes, endIndexes);
} else {
let entries = 0;
let maxIndent = this._indentOccurrences.length;
for (let i = 0; i < this._indentOccurrences.length; i++) {
let n = this._indentOccurrences[i];
if (n) {
if (n + entries > this._foldingRangesLimit) {
maxIndent = i;
break;
}
entries += n;
}
}
const tabSize = model.getOptions().tabSize;
// reverse and create arrays of the exact length
let startIndexes = new Uint32Array(this._foldingRangesLimit);
let endIndexes = new Uint32Array(this._foldingRangesLimit);
for (let i = this._length - 1, k = 0; i >= 0; i--) {
let startIndex = this._startIndexes[i];
let lineContent = model.getLineContent(startIndex);
let indent = TextModel.computeIndentLevel(lineContent, tabSize);
if (indent < maxIndent || (indent === maxIndent && entries++ < this._foldingRangesLimit)) {
startIndexes[k] = startIndex;
endIndexes[k] = this._endIndexes[i];
k++;
}
}
return new FoldingRegions(startIndexes, endIndexes);
}
}
}
interface PreviousRegion {
indent: number; // indent or -2 if a marker
endAbove: number; // end line number for the region above
line: number; // start line of the region. Only used for marker regions.
}
export function computeRanges(model: ITextModel, offSide: boolean, markers?: FoldingMarkers, foldingRangesLimit = MAX_FOLDING_REGIONS_FOR_INDENT_LIMIT): FoldingRegions {
const tabSize = model.getOptions().tabSize;
let result = new RangesCollector(foldingRangesLimit);
let pattern: RegExp | undefined = undefined;
if (markers) {
pattern = new RegExp(`(${markers.start.source})|(?:${markers.end.source})`);
}
let previousRegions: PreviousRegion[] = [];
let line = model.getLineCount() + 1;
previousRegions.push({ indent: -1, endAbove: line, line }); // sentinel, to make sure there's at least one entry
for (let line = model.getLineCount(); line > 0; line--) {
let lineContent = model.getLineContent(line);
let indent = TextModel.computeIndentLevel(lineContent, tabSize);
let previous = previousRegions[previousRegions.length - 1];
if (indent === -1) {
if (offSide) {
// for offSide languages, empty lines are associated to the previous block
// note: the next block is already written to the results, so this only
// impacts the end position of the block before
previous.endAbove = line;
}
continue; // only whitespace
}
let m;
if (pattern && (m = lineContent.match(pattern))) {
// folding pattern match
if (m[1]) { // start pattern match
// discard all regions until the folding pattern
let i = previousRegions.length - 1;
while (i > 0 && previousRegions[i].indent !== -2) {
i--;
}
if (i > 0) {
previousRegions.length = i + 1;
previous = previousRegions[i];
// new folding range from pattern, includes the end line
result.insertFirst(line, previous.line, indent);
previous.line = line;
previous.indent = indent;
previous.endAbove = line;
continue;
} else {
// no end marker found, treat line as a regular line
}
} else { // end pattern match
previousRegions.push({ indent: -2, endAbove: line, line });
continue;
}
}
if (previous.indent > indent) {
// discard all regions with larger indent
do {
previousRegions.pop();
previous = previousRegions[previousRegions.length - 1];
} while (previous.indent > indent);
// new folding range
let endLineNumber = previous.endAbove - 1;
if (endLineNumber - line >= 1) { // needs at east size 1
result.insertFirst(line, endLineNumber, indent);
}
}
if (previous.indent === indent) {
previous.endAbove = line;
} else { // previous.indent < indent
// new region with a bigger indent
previousRegions.push({ indent, endAbove: line, line });
}
}
return result.toIndentRanges(model);
}