TypeScript Selection.isEmpty方法代码示例

	public static deleteWordPartLeft(wordSeparators: WordCharacterClassifier, model: ICursorSimpleModel, selection: Selection, whitespaceHeuristics: boolean, wordNavigationType: WordNavigationType): Range {
		if (!selection.isEmpty()) {
			return selection;
		}

		const position = new Position(selection.positionLineNumber, selection.positionColumn);
		const lineNumber = position.lineNumber;
		const column = position.column;

		if (lineNumber === 1 && column === 1) {
			// Ignore deleting at beginning of file
			return null;
		}

		if (whitespaceHeuristics) {
			let r = WordOperations._deleteWordLeftWhitespace(model, position);
			if (r) {
				return r;
			}
		}

		const wordRange = WordOperations.deleteWordLeft(wordSeparators, model, selection, whitespaceHeuristics, wordNavigationType);
		const lastWordPartEnd = _lastWordPartEnd(model.getLineContent(position.lineNumber), position.column - 2);
		const wordPartRange = new Range(lineNumber, column, lineNumber, lastWordPartEnd + 2);

		if (wordPartRange.getStartPosition().isBeforeOrEqual(wordRange.getStartPosition())) {
			return wordRange;
		}
		return wordPartRange;
	}

	public static deleteWordPartRight(wordSeparators: WordCharacterClassifier, model: ICursorSimpleModel, selection: Selection, whitespaceHeuristics: boolean, wordNavigationType: WordNavigationType): Range {
		if (!selection.isEmpty()) {
			return selection;
		}

		const position = new Position(selection.positionLineNumber, selection.positionColumn);
		const lineNumber = position.lineNumber;
		const column = position.column;

		const lineCount = model.getLineCount();
		const maxColumn = model.getLineMaxColumn(lineNumber);
		if (lineNumber === lineCount && column === maxColumn) {
			// Ignore deleting at end of file
			return null;
		}

		if (whitespaceHeuristics) {
			let r = WordOperations._deleteWordRightWhitespace(model, position);
			if (r) {
				return r;
			}
		}

		const wordRange = WordOperations.deleteWordRight(wordSeparators, model, selection, whitespaceHeuristics, wordNavigationType);
		const nextWordPartBegin = _nextWordPartBegin(model.getLineContent(position.lineNumber), position.column);
		const wordPartRange = new Range(lineNumber, column, lineNumber, nextWordPartBegin);

		if (wordRange.getEndPosition().isBeforeOrEqual(wordPartRange.getEndPosition())) {
			return wordRange;
		}
		return wordPartRange;
	}

	public static _deleteWordPartRight(model: ICursorSimpleModel, selection: Selection): Range {
		if (!selection.isEmpty()) {
			return selection;
		}

		const pos = selection.getPosition();
		const toPosition = WordOperations._moveWordPartRight(model, pos);
		return new Range(pos.lineNumber, pos.column, toPosition.lineNumber, toPosition.column);
	}

	public static deleteWordLeft(wordSeparators: WordCharacterClassifier, model: ICursorSimpleModel, selection: Selection, whitespaceHeuristics: boolean, wordNavigationType: WordNavigationType): Range {
		if (!selection.isEmpty()) {
			return selection;
		}

		const position = new Position(selection.positionLineNumber, selection.positionColumn);

		let lineNumber = position.lineNumber;
		let column = position.column;

		if (lineNumber === 1 && column === 1) {
			// Ignore deleting at beginning of file
			return null;
		}

		if (whitespaceHeuristics) {
			let r = this._deleteWordLeftWhitespace(model, position);
			if (r) {
				return r;
			}
		}

		let prevWordOnLine = WordOperations._findPreviousWordOnLine(wordSeparators, model, position);

		if (wordNavigationType === WordNavigationType.WordStart) {
			if (prevWordOnLine) {
				column = prevWordOnLine.start + 1;
			} else {
				if (column > 1) {
					column = 1;
				} else {
					lineNumber--;
					column = model.getLineMaxColumn(lineNumber);
				}
			}
		} else {
			if (prevWordOnLine && column <= prevWordOnLine.end + 1) {
				prevWordOnLine = WordOperations._findPreviousWordOnLine(wordSeparators, model, new Position(lineNumber, prevWordOnLine.start + 1));
			}
			if (prevWordOnLine) {
				column = prevWordOnLine.end + 1;
			} else {
				if (column > 1) {
					column = 1;
				} else {
					lineNumber--;
					column = model.getLineMaxColumn(lineNumber);
				}
			}
		}

		return new Range(lineNumber, column, position.lineNumber, position.column);
	}

	private _attemptRemoveBlockComment(model: editorCommon.ITokenizedModel, s: Selection, startToken: string, endToken: string): editorCommon.IIdentifiedSingleEditOperation[] {
		let startLineNumber = s.startLineNumber;
		let endLineNumber = s.endLineNumber;

		let startTokenAllowedBeforeColumn = endToken.length + Math.max(
			model.getLineFirstNonWhitespaceColumn(s.startLineNumber),
			s.startColumn
		);

		let startTokenIndex = model.getLineContent(startLineNumber).lastIndexOf(startToken, startTokenAllowedBeforeColumn - 1);
		let endTokenIndex = model.getLineContent(endLineNumber).indexOf(endToken, s.endColumn - 1 - startToken.length);

		if (startTokenIndex !== -1 && endTokenIndex === -1) {
			endTokenIndex = model.getLineContent(startLineNumber).indexOf(endToken, startTokenIndex + startToken.length);
			endLineNumber = startLineNumber;
		}

		if (startTokenIndex === -1 && endTokenIndex !== -1) {
			startTokenIndex = model.getLineContent(endLineNumber).lastIndexOf(startToken, endTokenIndex);
			startLineNumber = endLineNumber;
		}

		if (s.isEmpty() && (startTokenIndex === -1 || endTokenIndex === -1)) {
			startTokenIndex = model.getLineContent(startLineNumber).indexOf(startToken);
			if (startTokenIndex !== -1) {
				endTokenIndex = model.getLineContent(startLineNumber).indexOf(endToken, startTokenIndex + startToken.length);
			}
		}

		// We have to adjust to possible inner white space.
		// For Space after startToken, add Space to startToken - range math will work out.
		if (startTokenIndex !== -1 && model.getLineContent(startLineNumber).charCodeAt(startTokenIndex + startToken.length) === CharCode.Space) {
			startToken += ' ';
		}

		// For Space before endToken, add Space before endToken and shift index one left.
		if (endTokenIndex !== -1 && model.getLineContent(endLineNumber).charCodeAt(endTokenIndex - 1) === CharCode.Space) {
			endToken = ' ' + endToken;
			endTokenIndex -= 1;
		}

		if (startTokenIndex !== -1 && endTokenIndex !== -1) {
			return BlockCommentCommand._createRemoveBlockCommentOperations(
				new Range(startLineNumber, startTokenIndex + startToken.length + 1, endLineNumber, endTokenIndex + 1), startToken, endToken
			);
		}

		return null;
	}

	private getCursorsForSelection(selection: Selection, editor: ICommonCodeEditor): Selection[] {
		if (selection.isEmpty()) {
			return [];
		}

		let model = editor.getModel();
		let newSelections: Selection[] = [];
		for (let i = selection.startLineNumber; i < selection.endLineNumber; i++) {
			let currentLineMaxColumn = model.getLineMaxColumn(i);
			newSelections.push(new Selection(i, currentLineMaxColumn, i, currentLineMaxColumn));
		}
		if (selection.endColumn > 1) {
			newSelections.push(new Selection(selection.endLineNumber, selection.endColumn, selection.endLineNumber, selection.endColumn));
		}

		return newSelections;
	}

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

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

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

			if (ops.length === 1) {
				this._deltaColumn = startToken.length;
			}
		}
		this._selectionId = builder.trackSelection(s);
		for (var i = 0; i < ops.length; i++) {
			builder.addEditOperation(ops[i].range, ops[i].text);
		}
	}

	public computeCursorState(model: editorCommon.ITokenizedModel, helper: editorCommon.ICursorStateComputerData): Selection {
		var inverseEditOperations = helper.getInverseEditOperations();
		var srcRange = inverseEditOperations[0].range;

		if (!this._originalSelection.isEmpty()) {
			// Preserve selection and extends to typed text
			return new Selection(
				srcRange.endLineNumber,
				srcRange.endColumn - this._text.length,
				srcRange.endLineNumber,
				srcRange.endColumn
			);
		}

		return new Selection(
			srcRange.endLineNumber,
			Math.min(this._originalSelection.positionColumn, srcRange.endColumn),
			srcRange.endLineNumber,
			Math.min(this._originalSelection.positionColumn, srcRange.endColumn)
		);
	}

	private _attemptRemoveBlockComment(model: editorCommon.ITokenizedModel, s: Selection, startToken: string, endToken: string): editorCommon.IIdentifiedSingleEditOperation[] {
		let startLineNumber = s.startLineNumber;
		let endLineNumber = s.endLineNumber;

		let startTokenAllowedBeforeColumn = endToken.length + Math.max(
			model.getLineFirstNonWhitespaceColumn(s.startLineNumber),
			s.startColumn
		);

		let startTokenIndex = model.getLineContent(startLineNumber).lastIndexOf(startToken, startTokenAllowedBeforeColumn - 1);
		let endTokenIndex = model.getLineContent(endLineNumber).indexOf(endToken, s.endColumn - 1 - startToken.length);

		if (startTokenIndex !== -1 && endTokenIndex === -1) {
			endTokenIndex = model.getLineContent(startLineNumber).indexOf(endToken, startTokenIndex + startToken.length);
			endLineNumber = startLineNumber;
		}

		if (startTokenIndex === -1 && endTokenIndex !== -1) {
			startTokenIndex = model.getLineContent(endLineNumber).lastIndexOf(startToken, endTokenIndex);
			startLineNumber = endLineNumber;
		}

		if (s.isEmpty() && (startTokenIndex === -1 || endTokenIndex === -1)) {
			startTokenIndex = model.getLineContent(startLineNumber).indexOf(startToken);
			if (startTokenIndex !== -1) {
				endTokenIndex = model.getLineContent(startLineNumber).indexOf(endToken, startTokenIndex + startToken.length);
			}
		}

		if (startTokenIndex !== -1 && endTokenIndex !== -1) {
			return BlockCommentCommand._createRemoveBlockCommentOperations({
				startLineNumber: startLineNumber,
				startColumn: startTokenIndex + startToken.length + 1,
				endLineNumber: endLineNumber,
				endColumn: endTokenIndex + 1
			}, startToken, endToken);
		}

		return null;
	}

	/**
	 * 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);
		}
	}