TypeScript CursorConfiguration.normalizeIndentation方法代碼示例

	private static _runAutoIndentType(config: CursorConfiguration, model: ITextModel, range: Range, ch: string): ICommand {
		let currentIndentation = LanguageConfigurationRegistry.getIndentationAtPosition(model, range.startLineNumber, range.startColumn);
		let actualIndentation = LanguageConfigurationRegistry.getIndentActionForType(model, range, ch, {
			shiftIndent: (indentation) => {
				return TypeOperations.shiftIndent(config, indentation);
			},
			unshiftIndent: (indentation) => {
				return TypeOperations.unshiftIndent(config, indentation);
			},
		});

		if (actualIndentation === null) {
			return null;
		}

		if (actualIndentation !== config.normalizeIndentation(currentIndentation)) {
			let firstNonWhitespace = model.getLineFirstNonWhitespaceColumn(range.startLineNumber);
			if (firstNonWhitespace === 0) {
				return TypeOperations._typeCommand(
					new Range(range.startLineNumber, 0, range.endLineNumber, range.endColumn),
					config.normalizeIndentation(actualIndentation) + ch,
					false
				);
			} else {
				return TypeOperations._typeCommand(
					new Range(range.startLineNumber, 0, range.endLineNumber, range.endColumn),
					config.normalizeIndentation(actualIndentation) +
					model.getLineContent(range.startLineNumber).substring(firstNonWhitespace - 1, range.startColumn - 1) + ch,
					false
				);
			}
		}

		return null;
	}

	private static _goodIndentForLine(config: CursorConfiguration, model: ITokenizedModel, lineNumber: number): string {
		let expectedIndentAction = LanguageConfigurationRegistry.getGoodIndentActionForLine(model, lineNumber);

		if (expectedIndentAction) {
			if (expectedIndentAction.action) {
				let indentation = expectedIndentAction.indentation;

				if (expectedIndentAction.action === IndentAction.Indent) {
					indentation = TypeOperations.shiftIndent(config, indentation);
				}

				if (expectedIndentAction.action === IndentAction.Outdent) {
					indentation = TypeOperations.unshiftIndent(config, indentation);
				}

				indentation = config.normalizeIndentation(indentation);

				if (indentation.length === 0) {
					return '';
				} else {
					return indentation;
				}
			}
			else {
				return expectedIndentAction.indentation;
			}
		}

		return null;
	}

	private static _typeInterceptorElectricChar(config: CursorConfiguration, model: ITokenizedModel, cursor: SingleCursorState, ch: string): EditOperationResult {
		if (!config.electricChars.hasOwnProperty(ch)) {
			return null;
		}

		let position = cursor.position;
		model.forceTokenization(position.lineNumber);
		let lineTokens = model.getLineTokens(position.lineNumber);

		let electricAction: IElectricAction;
		try {
			electricAction = LanguageConfigurationRegistry.onElectricCharacter(ch, lineTokens, position.column);
		} catch (e) {
			onUnexpectedError(e);
		}

		if (!electricAction) {
			return null;
		}

		if (electricAction.appendText) {
			return new EditOperationResult(new ReplaceCommandWithOffsetCursorState(cursor.selection, ch + electricAction.appendText, 0, -electricAction.appendText.length), {
				shouldPushStackElementBefore: false,
				shouldPushStackElementAfter: true
			});
		}

		if (electricAction.matchOpenBracket) {
			let endColumn = (lineTokens.getLineContent() + ch).lastIndexOf(electricAction.matchOpenBracket) + 1;
			let match = model.findMatchingBracketUp(electricAction.matchOpenBracket, {
				lineNumber: position.lineNumber,
				column: endColumn
			});

			if (match) {
				if (match.startLineNumber === position.lineNumber) {
					// matched something on the same line => no change in indentation
					return null;
				}
				let matchLine = model.getLineContent(match.startLineNumber);
				let matchLineIndentation = strings.getLeadingWhitespace(matchLine);
				let newIndentation = config.normalizeIndentation(matchLineIndentation);

				let lineText = model.getLineContent(position.lineNumber);
				let lineFirstNonBlankColumn = model.getLineFirstNonWhitespaceColumn(position.lineNumber) || position.column;

				let prefix = lineText.substring(lineFirstNonBlankColumn - 1, position.column - 1);
				let typeText = newIndentation + prefix + ch;

				let typeSelection = new Range(position.lineNumber, 1, position.lineNumber, position.column);

				return new EditOperationResult(new ReplaceCommand(typeSelection, typeText), {
					shouldPushStackElementBefore: false,
					shouldPushStackElementAfter: true
				});
			}
		}

		return null;
	}

	private static _enter(config: CursorConfiguration, model: ITokenizedModel, keepPosition: boolean, range: Range): EditOperationResult {

		let r = LanguageConfigurationRegistry.getEnterActionAtPosition(model, range.startLineNumber, range.startColumn);
		let enterAction = r.enterAction;
		let indentation = r.indentation;

		let executeCommand: ICommand;
		if (enterAction.indentAction === IndentAction.None) {
			// Nothing special
			executeCommand = TypeOperations.typeCommand(range, '\n' + config.normalizeIndentation(indentation + enterAction.appendText), keepPosition);

		} else if (enterAction.indentAction === IndentAction.Indent) {
			// Indent once
			executeCommand = TypeOperations.typeCommand(range, '\n' + config.normalizeIndentation(indentation + enterAction.appendText), keepPosition);

		} else if (enterAction.indentAction === IndentAction.IndentOutdent) {
			// Ultra special
			let normalIndent = config.normalizeIndentation(indentation);
			let increasedIndent = config.normalizeIndentation(indentation + enterAction.appendText);

			let typeText = '\n' + increasedIndent + '\n' + normalIndent;

			if (keepPosition) {
				executeCommand = new ReplaceCommandWithoutChangingPosition(range, typeText);
			} else {
				executeCommand = new ReplaceCommandWithOffsetCursorState(range, typeText, -1, increasedIndent.length - normalIndent.length);
			}
		} else if (enterAction.indentAction === IndentAction.Outdent) {
			let desiredIndentCount = ShiftCommand.unshiftIndentCount(indentation, indentation.length + 1, config.tabSize);
			let actualIndentation = '';
			for (let i = 0; i < desiredIndentCount; i++) {
				actualIndentation += '\t';
			}
			executeCommand = TypeOperations.typeCommand(range, '\n' + config.normalizeIndentation(actualIndentation + enterAction.appendText), keepPosition);
		}

		return new EditOperationResult(executeCommand, {
			shouldPushStackElementBefore: true,
			shouldPushStackElementAfter: false,
			isAutoWhitespaceCommand: true
		});
	}

	private static _enter(config: CursorConfiguration, model: ITokenizedModel, keepPosition: boolean, range: Range): CommandResult {
		let r = LanguageConfigurationRegistry.getEnterAction(model, range);
		let enterAction = r.enterAction;
		let indentation = r.indentation;

		let beforeText = '';

		if (!r.ignoreCurrentLine) {
			// textBeforeEnter doesn't match unIndentPattern.
			let goodIndent = this._goodIndentForLine(config, model, range.startLineNumber);

			if (goodIndent !== null && goodIndent === r.indentation) {
				if (enterAction.outdentCurrentLine) {
					goodIndent = TypeOperations.unshiftIndent(config, goodIndent);
				}

				let lineText = model.getLineContent(range.startLineNumber);
				if (config.normalizeIndentation(goodIndent) !== config.normalizeIndentation(indentation)) {
					beforeText = config.normalizeIndentation(goodIndent) + lineText.substring(indentation.length, range.startColumn - 1);
					indentation = goodIndent;
					range = new Range(range.startLineNumber, 1, range.endLineNumber, range.endColumn);
				}
			}
		}

		if (enterAction.removeText) {
			indentation = indentation.substring(0, indentation.length - enterAction.removeText);
		}

		let executeCommand: ICommand;
		if (enterAction.indentAction === IndentAction.None) {
			// Nothing special
			executeCommand = TypeOperations.typeCommand(range, beforeText + '\n' + config.normalizeIndentation(indentation + enterAction.appendText), keepPosition);

		} else if (enterAction.indentAction === IndentAction.Indent) {
			// Indent once
			executeCommand = TypeOperations.typeCommand(range, beforeText + '\n' + config.normalizeIndentation(indentation + enterAction.appendText), keepPosition);

		} else if (enterAction.indentAction === IndentAction.IndentOutdent) {
			// Ultra special
			let normalIndent = config.normalizeIndentation(indentation);
			let increasedIndent = config.normalizeIndentation(indentation + enterAction.appendText);

			let typeText = beforeText + '\n' + increasedIndent + '\n' + normalIndent;

			if (keepPosition) {
				executeCommand = new ReplaceCommandWithoutChangingPosition(range, typeText);
			} else {
				executeCommand = new ReplaceCommandWithOffsetCursorState(range, typeText, -1, increasedIndent.length - normalIndent.length);
			}
		} else if (enterAction.indentAction === IndentAction.Outdent) {
			let actualIndentation = TypeOperations.unshiftIndent(config, indentation);
			executeCommand = TypeOperations.typeCommand(range, beforeText + '\n' + config.normalizeIndentation(actualIndentation + enterAction.appendText), keepPosition);
		}

		return new CommandResult(executeCommand, true);
	}

	private static _goodIndentForLine(config: CursorConfiguration, model: ITextModel, lineNumber: number): string {
		let action: IndentAction | EnterAction;
		let indentation: string;

		let expectedIndentAction = config.autoIndent ? LanguageConfigurationRegistry.getInheritIndentForLine(model, lineNumber, false) : null;
		if (expectedIndentAction) {
			action = expectedIndentAction.action;
			indentation = expectedIndentAction.indentation;
		} else if (lineNumber > 1) {
			let lastLineNumber = lineNumber - 1;
			for (lastLineNumber = lineNumber - 1; lastLineNumber >= 1; lastLineNumber--) {
				let lineText = model.getLineContent(lastLineNumber);
				let nonWhitespaceIdx = strings.lastNonWhitespaceIndex(lineText);
				if (nonWhitespaceIdx >= 0) {
					break;
				}
			}

			if (lastLineNumber < 1) {
				// No previous line with content found
				return null;
			}

			let maxColumn = model.getLineMaxColumn(lastLineNumber);
			let expectedEnterAction = LanguageConfigurationRegistry.getEnterAction(model, new Range(lastLineNumber, maxColumn, lastLineNumber, maxColumn));
			if (expectedEnterAction) {
				indentation = expectedEnterAction.indentation;
				action = expectedEnterAction.enterAction;
				if (action) {
					indentation += action.appendText;
				}
			}
		}

		if (action) {
			if (action === IndentAction.Indent) {
				indentation = TypeOperations.shiftIndent(config, indentation);
			}

			if (action === IndentAction.Outdent) {
				indentation = TypeOperations.unshiftIndent(config, indentation);
			}

			indentation = config.normalizeIndentation(indentation);
		}

		if (!indentation) {
			return null;
		}

		return indentation;
	}

	public static tab(config: CursorConfiguration, model: ITokenizedModel, cursors: SingleCursorState[]): EditOperationResult {
		let commands: CommandResult[] = [];
		for (let i = 0, len = cursors.length; i < len; i++) {
			const cursor = cursors[i];
			let selection = cursor.selection;

			if (selection.isEmpty()) {

				let lineText = model.getLineContent(selection.startLineNumber);

				if (/^\s*$/.test(lineText)) {
					let goodIndent = this._goodIndentForLine(config, model, selection.startLineNumber);
					goodIndent = goodIndent || '\t';
					let possibleTypeText = config.normalizeIndentation(goodIndent);
					if (!strings.startsWith(lineText, possibleTypeText)) {
						let command = new ReplaceCommand(new Range(selection.startLineNumber, 1, selection.startLineNumber, lineText.length + 1), possibleTypeText);
						commands[i] = new CommandResult(command, true);
						continue;
					}
				}

				commands[i] = new CommandResult(this._replaceJumpToNextIndent(config, model, selection), true);
			} else {
				if (selection.startLineNumber === selection.endLineNumber) {
					let lineMaxColumn = model.getLineMaxColumn(selection.startLineNumber);
					if (selection.startColumn !== 1 || selection.endColumn !== lineMaxColumn) {
						// This is a single line selection that is not the entire line
						commands[i] = new CommandResult(this._replaceJumpToNextIndent(config, model, selection), false);
						continue;
					}
				}

				commands[i] = new CommandResult(
					new ShiftCommand(selection, {
						isUnshift: false,
						tabSize: config.tabSize,
						oneIndent: config.oneIndent,
						useTabStops: config.useTabStops
					}),
					false
				);
			}
		}
		return new EditOperationResult(commands, {
			shouldPushStackElementBefore: true,
			shouldPushStackElementAfter: true
		});
	}

	public static tab(config: CursorConfiguration, model: ITokenizedModel, cursor: SingleCursorState): EditOperationResult {
		let selection = cursor.selection;

		if (selection.isEmpty()) {

			let lineText = model.getLineContent(selection.startLineNumber);

			if (/^\s*$/.test(lineText)) {
				let goodIndent = this._goodIndentForLine(config, model, selection.startLineNumber);
				goodIndent = goodIndent || '\t';
				let possibleTypeText = config.normalizeIndentation(goodIndent);
				if (!strings.startsWith(lineText, possibleTypeText)) {
					let command = new ReplaceCommand(new Range(selection.startLineNumber, 1, selection.startLineNumber, lineText.length + 1), possibleTypeText);
					return new EditOperationResult(command, {
						shouldPushStackElementBefore: false,
						shouldPushStackElementAfter: false,
						isAutoWhitespaceCommand: true
					});
				}
			}

			return new EditOperationResult(this._replaceJumpToNextIndent(config, model, selection), {
				shouldPushStackElementBefore: false,
				shouldPushStackElementAfter: false,
				isAutoWhitespaceCommand: true
			});
		} else {
			if (selection.startLineNumber === selection.endLineNumber) {
				let lineMaxColumn = model.getLineMaxColumn(selection.startLineNumber);
				if (selection.startColumn !== 1 || selection.endColumn !== lineMaxColumn) {
					// This is a single line selection that is not the entire line
					return new EditOperationResult(this._replaceJumpToNextIndent(config, model, selection), {
						shouldPushStackElementBefore: false,
						shouldPushStackElementAfter: false
					});
				}
			}

			return this.indent(config, model, cursor);
		}
	}

	public static tab(config: CursorConfiguration, model: ITextModel, selections: Selection[]): ICommand[] {
		let commands: ICommand[] = [];
		for (let i = 0, len = selections.length; i < len; i++) {
			const selection = selections[i];

			if (selection.isEmpty()) {

				let lineText = model.getLineContent(selection.startLineNumber);

				if (/^\s*$/.test(lineText) && model.isCheapToTokenize(selection.startLineNumber)) {
					let goodIndent = this._goodIndentForLine(config, model, selection.startLineNumber);
					goodIndent = goodIndent || '\t';
					let possibleTypeText = config.normalizeIndentation(goodIndent);
					if (!strings.startsWith(lineText, possibleTypeText)) {
						commands[i] = new ReplaceCommand(new Range(selection.startLineNumber, 1, selection.startLineNumber, lineText.length + 1), possibleTypeText, true);
						continue;
					}
				}

				commands[i] = this._replaceJumpToNextIndent(config, model, selection, true);
			} else {
				if (selection.startLineNumber === selection.endLineNumber) {
					let lineMaxColumn = model.getLineMaxColumn(selection.startLineNumber);
					if (selection.startColumn !== 1 || selection.endColumn !== lineMaxColumn) {
						// This is a single line selection that is not the entire line
						commands[i] = this._replaceJumpToNextIndent(config, model, selection, false);
						continue;
					}
				}

				commands[i] = new ShiftCommand(selection, {
					isUnshift: false,
					tabSize: config.tabSize,
					indentSize: config.indentSize,
					insertSpaces: config.insertSpaces,
					useTabStops: config.useTabStops
				});
			}
		}
		return commands;
	}

	private static _goodIndentForLine(config: CursorConfiguration, model: ITokenizedModel, lineNumber: number): string {
		let lastLineNumber = lineNumber - 1;

		for (lastLineNumber = lineNumber - 1; lastLineNumber >= 1; lastLineNumber--) {
			let lineText = model.getLineContent(lastLineNumber);
			let nonWhitespaceIdx = strings.lastNonWhitespaceIndex(lineText);
			if (nonWhitespaceIdx >= 0) {
				break;
			}
		}

		if (lastLineNumber < 1) {
			// No previous line with content found
			return '\t';
		}

		let r = LanguageConfigurationRegistry.getEnterActionAtPosition(model, lastLineNumber, model.getLineMaxColumn(lastLineNumber));

		let indentation: string;
		if (r.enterAction.indentAction === IndentAction.Outdent) {
			let desiredIndentCount = ShiftCommand.unshiftIndentCount(r.indentation, r.indentation.length, config.tabSize);
			indentation = '';
			for (let i = 0; i < desiredIndentCount; i++) {
				indentation += '\t';
			}
			indentation = config.normalizeIndentation(indentation);
		} else {
			indentation = r.indentation;
		}

		let result = indentation + r.enterAction.appendText;
		if (result.length === 0) {
			// good position is at column 1, but we gotta do something...
			return '\t';
		}
		return result;
	}