167 lines
5.0 KiB
TypeScript
167 lines
5.0 KiB
TypeScript
/**
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* folding.ts
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*
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* @author CismonX <admin@cismon.net>
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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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* Provide folding range info for Texinfo source code.
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*/
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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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}
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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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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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static get(document: vscode.TextDocument) {
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return FoldingRangeContext.map.get(document) ?? new FoldingRangeContext(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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}
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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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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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private intervalTree = new IntervalTree();
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private tempFoldingRanges?: vscode.FoldingRange[];
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private commentRange?: [number, number];
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private headerStart?: number;
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private closingBlocks = <ClosingBlock[]>[];
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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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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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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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if (!lineText.startsWith('@')) {
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continue;
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}
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if (this.processComment(lineText, lineNum)) {
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continue;
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}
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this.processBlock(lineText, lineNum);
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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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}
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}
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}
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private processComment(lineText: string, lineNum: number) {
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if (lineText.startsWith('c', 1)) {
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if (!lineText.startsWith(' ', 2) && !lineText.startsWith('omment ', 2)) {
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return false;
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}
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// Check for opening/closing header.
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if (lineText.startsWith('%**', lineText[2] === ' ' ? 3 : 9)) {
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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.headerStart = undefined;
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}
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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.commentRange = [lineNum, lineNum];
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}
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return true;
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}
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return false;
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}
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private processBlock(lineText: string, lineNum: number) {
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if (lineText.startsWith('end ', 1)) {
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this.closingBlocks.push({ name: lineText.substring(5), line: lineNum });
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} else {
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const closingBlock = this.closingBlocks.pop();
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if (closingBlock === undefined) {
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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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} 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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* Represents a Texinfo block marked "closing" by `@end` command.
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*/
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interface ClosingBlock {
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/**
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* The name of the block.
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*/
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name: string;
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/**
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* The terminating line number of the block.
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*/
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line: number;
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}
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