TypeScript ITextModel.tokenizeIfCheap方法代碼示例

	public getEditOperations(model: ITextModel, builder: editorCommon.IEditOperationBuilder): void {
		const startLineNumber = this._selection.startLineNumber;
		const startColumn = this._selection.startColumn;

		model.tokenizeIfCheap(startLineNumber);
		const languageId = model.getLanguageIdAtPosition(startLineNumber, startColumn);
		const config = LanguageConfigurationRegistry.getComments(languageId);
		if (!config || !config.blockCommentStartToken || !config.blockCommentEndToken) {
			// Mode does not support block comments
			return;
		}

		this._createOperationsForBlockComment(this._selection, config.blockCommentStartToken, config.blockCommentEndToken, model, builder);
	}

	/**
	 * Given an unsuccessful analysis, delegate to the block comment command
	 */
	private _executeBlockComment(model: ITextModel, builder: editorCommon.IEditOperationBuilder, s: Selection): void {
		model.tokenizeIfCheap(s.startLineNumber);
		let languageId = model.getLanguageIdAtPosition(s.startLineNumber, 1);
		let config = LanguageConfigurationRegistry.getComments(languageId);
		if (!config || !config.blockCommentStartToken || !config.blockCommentEndToken) {
			// Mode does not support block comments
			return;
		}

		const startToken = config.blockCommentStartToken;
		const endToken = config.blockCommentEndToken;

		let ops = this._attemptRemoveBlockComment(model, s, startToken, endToken);
		if (!ops) {
			if (s.isEmpty()) {
				const lineContent = model.getLineContent(s.startLineNumber);
				let firstNonWhitespaceIndex = strings.firstNonWhitespaceIndex(lineContent);
				if (firstNonWhitespaceIndex === -1) {
					// Line is empty or contains only whitespace
					firstNonWhitespaceIndex = lineContent.length;
				}
				ops = BlockCommentCommand._createAddBlockCommentOperations(
					new Range(s.startLineNumber, firstNonWhitespaceIndex + 1, s.startLineNumber, lineContent.length + 1), startToken, endToken
				);
			} else {
				ops = BlockCommentCommand._createAddBlockCommentOperations(
					new Range(s.startLineNumber, model.getLineFirstNonWhitespaceColumn(s.startLineNumber), s.endLineNumber, model.getLineMaxColumn(s.endLineNumber)), startToken, endToken
				);
			}

			if (ops.length === 1) {
				// Leave cursor after token and Space
				this._deltaColumn = startToken.length + 1;
			}
		}
		this._selectionId = builder.trackSelection(s);
		for (let i = 0; i < ops.length; i++) {
			builder.addEditOperation(ops[i].range, ops[i].text);
		}
	}

	/**
	 * Do an initial pass over the lines and gather info about the line comment string.
	 * Returns null if any of the lines doesn't support a line comment string.
	 */
	public static _gatherPreflightCommentStrings(model: ITextModel, startLineNumber: number, endLineNumber: number): ILinePreflightData[] | null {

		model.tokenizeIfCheap(startLineNumber);
		const languageId = model.getLanguageIdAtPosition(startLineNumber, 1);

		const config = LanguageConfigurationRegistry.getComments(languageId);
		const commentStr = (config ? config.lineCommentToken : null);
		if (!commentStr) {
			// Mode does not support line comments
			return null;
		}

		let lines: ILinePreflightData[] = [];
		for (let i = 0, lineCount = endLineNumber - startLineNumber + 1; i < lineCount; i++) {
			lines[i] = {
				ignore: false,
				commentStr: commentStr,
				commentStrOffset: 0,
				commentStrLength: commentStr.length
			};
		}

		return lines;
	}