Implement folding range container
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@ -61,11 +61,6 @@
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"strip-json-comments": "^3.1.1"
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}
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},
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"@flatten-js/interval-tree": {
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"version": "1.0.12",
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"resolved": "https://registry.npmjs.org/@flatten-js/interval-tree/-/interval-tree-1.0.12.tgz",
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"integrity": "sha512-j2o14WdFPII5cI57j0XNSWQm80gM4G6RT5+NLaH8q7KmQKejR/qZiGiViMjRgMtPiiwaX6hv3hlXeyRL3yzi7g=="
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},
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"@types/eslint-visitor-keys": {
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"version": "1.0.0",
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"resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
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@ -25,7 +25,6 @@
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"typescript": "^4.0.3"
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},
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"dependencies": {
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"@flatten-js/interval-tree": "^1.0.12",
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"node-html-parser": "^1.3.1"
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},
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"scripts": {
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148
src/folding.ts
148
src/folding.ts
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@ -5,7 +5,6 @@
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* @license MIT
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*/
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import IntervalTree from '@flatten-js/interval-tree';
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import * as vscode from 'vscode';
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/**
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@ -14,46 +13,73 @@ import * as vscode from 'vscode';
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export class FoldingRangeProvider implements vscode.FoldingRangeProvider {
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provideFoldingRanges(document: vscode.TextDocument) {
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return FoldingRangeContext.get(document).foldingRanges;
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return FoldingRangeContext.get(document)?.foldingRanges;
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}
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}
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/**
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* Stores information about folding ranges for a document.
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*/
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export class FoldingRangeContext {
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private static readonly map = new Map<vscode.TextDocument, FoldingRangeContext>();
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/**
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* Initialize folding range context for a document.
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*
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* @param document
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*/
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static open(document: vscode.TextDocument) {
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if (document.languageId === 'texinfo') {
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new FoldingRangeContext(document);
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}
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}
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/**
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* Get existing folding range context of a document.
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*
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* @param document
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*/
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static get(document: vscode.TextDocument) {
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return FoldingRangeContext.map.get(document) ?? new FoldingRangeContext(document);
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return FoldingRangeContext.map.get(document);
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}
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/**
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* Update the folding range context of a document based on its change event.
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*
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* @param event Change event of a document.
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*/
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static update(event: vscode.TextDocumentChangeEvent) {
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if (event.document.languageId !== 'texinfo') {
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return;
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}
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FoldingRangeContext.get(event.document).update(event.contentChanges);
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FoldingRangeContext.get(event.document)?.update(event.contentChanges);
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}
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/**
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* Destroy the folding range context of a document.
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*
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* @param document
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*/
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static close(document: vscode.TextDocument) {
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FoldingRangeContext.map.delete(document);
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}
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/**
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* Destroy all existing folding range contexts.
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*/
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static clear() {
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FoldingRangeContext.map.clear();
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}
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get foldingRanges(): vscode.FoldingRange[] {
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return this.tempFoldingRanges ?? (this.tempFoldingRanges = this.intervalTree.values);
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/**
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* Get VSCode folding ranges from the context.
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*/
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get foldingRanges() {
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return this.ranges.values;
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}
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private intervalTree = new IntervalTree();
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private tempFoldingRanges?: vscode.FoldingRange[];
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private readonly ranges = new FoldingRangeContainer();
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private commentRange?: [number, number];
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@ -64,12 +90,18 @@ export class FoldingRangeContext {
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private constructor(private readonly document: vscode.TextDocument) {
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FoldingRangeContext.map.set(document, this);
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console.log(Date.now());
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this.calculateFoldingRanges();
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this.updateFoldingRanges(0, this.document.lineCount - 1);
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console.log(Date.now());
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}
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private calculateFoldingRanges() {
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for (let idx = this.document.lineCount - 1; idx >= 0; --idx) {
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/**
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* Calculate and update folding ranges for the document.
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*
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* @param start Starting line number.
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* @param end Ending line number.
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*/
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private updateFoldingRanges(start: number, end: number) {
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for (let idx = end; idx >= start; --idx) {
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const line = this.document.lineAt(idx);
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const lineText = line.text;
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const lineNum = line.lineNumber;
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@ -83,7 +115,7 @@ export class FoldingRangeContext {
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}
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if (this.commentRange !== undefined) {
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if (this.commentRange[1] - this.commentRange[0] > 1) {
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this.insertRange(this.commentRange);
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this.ranges.insert(this.commentRange[0], this.commentRange[1]);
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}
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}
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}
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@ -98,16 +130,17 @@ export class FoldingRangeContext {
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if (this.headerStart === undefined) {
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this.headerStart = lineNum;
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} else {
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this.insertRange([lineNum, this.headerStart]);
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this.ranges.insert(lineNum, this.headerStart);
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this.headerStart = undefined;
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}
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return true;
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}
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if (this.commentRange === undefined) {
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this.commentRange = [lineNum, lineNum];
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} else if (this.commentRange[0] - 1 === lineNum) {
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this.commentRange[0] = lineNum;
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} else {
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this.insertRange(this.commentRange, vscode.FoldingRangeKind.Comment);
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this.ranges.insert(this.commentRange[0], this.commentRange[1], vscode.FoldingRangeKind.Comment);
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this.commentRange = [lineNum, lineNum];
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}
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return true;
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@ -124,29 +157,16 @@ export class FoldingRangeContext {
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return;
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}
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if (lineText.substring(1, closingBlock.name.length + 2).trim() === closingBlock.name) {
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this.insertRange([lineNum, closingBlock.line]);
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this.ranges.insert(lineNum, closingBlock.line);
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} else {
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this.closingBlocks.push(closingBlock);
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}
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}
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}
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private insertRange(range: [start: number, end: number], kind?: vscode.FoldingRangeKind) {
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const foldingRange = new vscode.FoldingRange(range[0], range[1], kind);
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this.intervalTree.insert(range, foldingRange);
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}
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private update(events: readonly vscode.TextDocumentContentChangeEvent[]) {
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console.log(events);
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}
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private clear() {
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this.intervalTree = new IntervalTree();
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this.tempFoldingRanges = undefined;
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this.commentRange = undefined;
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this.headerStart = undefined;
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this.closingBlocks = [];
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}
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}
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/**
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@ -164,3 +184,73 @@ interface ClosingBlock {
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*/
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line: number;
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}
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/**
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* Container which stores multiple ranges.
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*
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* Used for incremental calculation of VSCode folding ranges to prevent full rescan on edit,
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* which could be catastrophic when dealing with large documents.
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*/
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class FoldingRangeContainer {
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private nodes = <FoldingRangeNode[]>[];
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private bufferedValues?: vscode.FoldingRange[];
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/**
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* Insert a new range to the container.
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*
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* The new range **SHOULD NOT** overlap with existing ranges.
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*
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* @param start Start of range.
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* @param end End of range
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* @param kind Type of VSCode folding range.
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*/
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insert(start: number, end: number, kind?: vscode.FoldingRangeKind) {
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if (this.nodes.length < end) {
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this.nodes.push(...Array.from({ length: end - this.nodes.length + 1 }, () => new FoldingRangeNode()));
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}
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this.bufferedValues = undefined;
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this.nodes[start].end = end;
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this.nodes[start].kind = kind;
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this.nodes[end].start = start;
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this.nodes[end].kind = kind;
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}
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/**
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* Get VSCode folding ranges from the container.
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*/
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get values() {
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if (this.bufferedValues !== undefined) {
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return this.bufferedValues;
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}
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const values = <vscode.FoldingRange[]>[];
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this.nodes.forEach((node, idx) => {
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if (node.end !== undefined) {
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values.push(new vscode.FoldingRange(idx, node.end, node.kind));
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}
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});
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return (this.bufferedValues = values);
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}
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}
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/**
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* Node of a folding range which represents a line in the document.
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*/
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class FoldingRangeNode {
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/**
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* Corresponding start node index.
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*/
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start?: number;
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/**
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* Corresponding end node index.
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*/
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end?: number;
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/**
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* Type of VSCode folding range.
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*/
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kind?: vscode.FoldingRangeKind;
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}
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