TypeScript ITextModel.getLanguageIdAtPosition方法代码示例

	private shouldAutoIndent(model: ITextModel, selection: Selection) {
		if (!this._autoIndent) {
			return false;
		}
		// if it's not easy to tokenize, we stop auto indent.
		if (!model.isCheapToTokenize(selection.startLineNumber)) {
			return false;
		}
		let languageAtSelectionStart = model.getLanguageIdAtPosition(selection.startLineNumber, 1);
		let languageAtSelectionEnd = model.getLanguageIdAtPosition(selection.endLineNumber, 1);

		if (languageAtSelectionStart !== languageAtSelectionEnd) {
			return false;
		}

		if (LanguageConfigurationRegistry.getIndentRulesSupport(languageAtSelectionStart) === null) {
			return false;
		}

		return true;
	}

	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;
	}

			getLanguageIdAtPosition: (lineNumber: number, column: number) => {
				return model.getLanguageIdAtPosition(lineNumber, column);
			},

	public getEditOperations(model: ITextModel, builder: IEditOperationBuilder): void {

		let modelLineCount = model.getLineCount();

		if (this._isMovingDown && this._selection.endLineNumber === modelLineCount) {
			return;
		}
		if (!this._isMovingDown && this._selection.startLineNumber === 1) {
			return;
		}

		this._moveEndPositionDown = false;
		let s = this._selection;

		if (s.startLineNumber < s.endLineNumber && s.endColumn === 1) {
			this._moveEndPositionDown = true;
			s = s.setEndPosition(s.endLineNumber - 1, model.getLineMaxColumn(s.endLineNumber - 1));
		}

		const { tabSize, indentSize, insertSpaces } = model.getOptions();
		let indentConverter = this.buildIndentConverter(tabSize, indentSize, insertSpaces);
		let virtualModel = {
			getLineTokens: (lineNumber: number) => {
				return model.getLineTokens(lineNumber);
			},
			getLanguageIdentifier: () => {
				return model.getLanguageIdentifier();
			},
			getLanguageIdAtPosition: (lineNumber: number, column: number) => {
				return model.getLanguageIdAtPosition(lineNumber, column);
			},
			getLineContent: null as unknown as (lineNumber: number) => string,
		};

		if (s.startLineNumber === s.endLineNumber && model.getLineMaxColumn(s.startLineNumber) === 1) {
			// Current line is empty
			let lineNumber = s.startLineNumber;
			let otherLineNumber = (this._isMovingDown ? lineNumber + 1 : lineNumber - 1);

			if (model.getLineMaxColumn(otherLineNumber) === 1) {
				// Other line number is empty too, so no editing is needed
				// Add a no-op to force running by the model
				builder.addEditOperation(new Range(1, 1, 1, 1), null);
			} else {
				// Type content from other line number on line number
				builder.addEditOperation(new Range(lineNumber, 1, lineNumber, 1), model.getLineContent(otherLineNumber));

				// Remove content from other line number
				builder.addEditOperation(new Range(otherLineNumber, 1, otherLineNumber, model.getLineMaxColumn(otherLineNumber)), null);
			}
			// Track selection at the other line number
			s = new Selection(otherLineNumber, 1, otherLineNumber, 1);

		} else {

			let movingLineNumber: number;
			let movingLineText: string;

			if (this._isMovingDown) {
				movingLineNumber = s.endLineNumber + 1;
				movingLineText = model.getLineContent(movingLineNumber);
				// Delete line that needs to be moved
				builder.addEditOperation(new Range(movingLineNumber - 1, model.getLineMaxColumn(movingLineNumber - 1), movingLineNumber, model.getLineMaxColumn(movingLineNumber)), null);

				let insertingText = movingLineText;

				if (this.shouldAutoIndent(model, s)) {
					let movingLineMatchResult = this.matchEnterRule(model, indentConverter, tabSize, movingLineNumber, s.startLineNumber - 1);
					// if s.startLineNumber - 1 matches onEnter rule, we still honor that.
					if (movingLineMatchResult !== null) {
						let oldIndentation = strings.getLeadingWhitespace(model.getLineContent(movingLineNumber));
						let newSpaceCnt = movingLineMatchResult + indentUtils.getSpaceCnt(oldIndentation, tabSize);
						let newIndentation = indentUtils.generateIndent(newSpaceCnt, tabSize, insertSpaces);
						insertingText = newIndentation + this.trimLeft(movingLineText);
					} else {
						// no enter rule matches, let's check indentatin rules then.
						virtualModel.getLineContent = (lineNumber: number) => {
							if (lineNumber === s.startLineNumber) {
								return model.getLineContent(movingLineNumber);
							} else {
								return model.getLineContent(lineNumber);
							}
						};
						let indentOfMovingLine = LanguageConfigurationRegistry.getGoodIndentForLine(virtualModel, model.getLanguageIdAtPosition(
							movingLineNumber, 1), s.startLineNumber, indentConverter);
						if (indentOfMovingLine !== null) {
							let oldIndentation = strings.getLeadingWhitespace(model.getLineContent(movingLineNumber));
							let newSpaceCnt = indentUtils.getSpaceCnt(indentOfMovingLine, tabSize);
							let oldSpaceCnt = indentUtils.getSpaceCnt(oldIndentation, tabSize);
							if (newSpaceCnt !== oldSpaceCnt) {
								let newIndentation = indentUtils.generateIndent(newSpaceCnt, tabSize, insertSpaces);
								insertingText = newIndentation + this.trimLeft(movingLineText);
							}
						}
					}

					// add edit operations for moving line first to make sure it's executed after we make indentation change
					// to s.startLineNumber
					builder.addEditOperation(new Range(s.startLineNumber, 1, s.startLineNumber, 1), insertingText + '\n');

//.........这里部分代码省略.........