TypeScript strings.getLeadingWhitespace函數代碼示例

	private matchEnterRule(model: ITokenizedModel, indentConverter: IIndentConverter, tabSize: number, line: number, oneLineAbove: number, oneLineAboveText?: string) {
		let validPrecedingLine = oneLineAbove;
		while (validPrecedingLine >= 1) {
			// ship empty lines as empty lines just inherit indentation
			let lineContent;
			if (validPrecedingLine === oneLineAbove && oneLineAboveText !== undefined) {
				lineContent = oneLineAboveText;
			} else {
				lineContent = model.getLineContent(validPrecedingLine);
			}

			let nonWhitespaceIdx = strings.lastNonWhitespaceIndex(lineContent);
			if (nonWhitespaceIdx >= 0) {
				break;
			}
			validPrecedingLine--;
		}

		if (validPrecedingLine < 1 || line > model.getLineCount()) {
			return null;
		}

		let maxColumn = model.getLineMaxColumn(validPrecedingLine);
		let enter = LanguageConfigurationRegistry.getEnterAction(model, new Range(validPrecedingLine, maxColumn, validPrecedingLine, maxColumn));

		if (enter) {
			let enterPrefix = enter.indentation;
			let enterAction = enter.enterAction;

			if (enterAction.indentAction === IndentAction.None) {
				enterPrefix = enter.indentation + enterAction.appendText;
			} else if (enterAction.indentAction === IndentAction.Indent) {
				enterPrefix = enter.indentation + enterAction.appendText;
			} else if (enterAction.indentAction === IndentAction.IndentOutdent) {
				enterPrefix = enter.indentation;
			} else if (enterAction.indentAction === IndentAction.Outdent) {
				enterPrefix = indentConverter.unshiftIndent(enter.indentation) + enterAction.appendText;
			}
			let movingLineText = model.getLineContent(line);
			if (this.trimLeft(movingLineText).indexOf(this.trimLeft(enterPrefix)) >= 0) {
				let oldIndentation = strings.getLeadingWhitespace(model.getLineContent(line));
				let newIndentation = strings.getLeadingWhitespace(enterPrefix);
				let indentMetadataOfMovelingLine = LanguageConfigurationRegistry.getIndentMetadata(model, line);
				if (indentMetadataOfMovelingLine & IndentConsts.DECREASE_MASK) {
					newIndentation = indentConverter.unshiftIndent(newIndentation);
				}
				let newSpaceCnt = IndentUtil.getSpaceCnt(newIndentation, tabSize);
				let oldSpaceCnt = IndentUtil.getSpaceCnt(oldIndentation, tabSize);
				return newSpaceCnt - oldSpaceCnt;
			}
		}

		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;
	}

				variable.snippet.walk(marker => {
					if (marker === variable) {
						return false;
					}
					if (marker instanceof Text) {
						varLeadingWhitespace = getLeadingWhitespace(marker.value.split(/\r\n|\r|\n/).pop());
					}
					return true;
				});

	resolve(variable: Variable): string {

		const { name } = variable;

		if (name === 'SELECTION' || name === 'TM_SELECTED_TEXT') {
			let value = this._model.getValueInRange(this._selection) || undefined;
			if (value && this._selection.startLineNumber !== this._selection.endLineNumber) {
				// Selection is a multiline string which we indentation we now
				// need to adjust. We compare the indentation of this variable
				// with the indentation at the editor position and add potential
				// extra indentation to the value

				const line = this._model.getLineContent(this._selection.startLineNumber);
				const lineLeadingWhitespace = getLeadingWhitespace(line, 0, this._selection.startColumn - 1);

				let varLeadingWhitespace = lineLeadingWhitespace;
				variable.snippet.walk(marker => {
					if (marker === variable) {
						return false;
					}
					if (marker instanceof Text) {
						varLeadingWhitespace = getLeadingWhitespace(marker.value.split(/\r\n|\r|\n/).pop());
					}
					return true;
				});
				const whitespaceCommonLength = commonPrefixLength(varLeadingWhitespace, lineLeadingWhitespace);

				value = value.replace(
					/(\r\n|\r|\n)(.*)/g,
					(m, newline, rest) => `${newline}${varLeadingWhitespace.substr(whitespaceCommonLength)}${rest}`
				);
			}
			return value;

		} else if (name === 'TM_CURRENT_LINE') {
			return this._model.getLineContent(this._selection.positionLineNumber);

		} else if (name === 'TM_CURRENT_WORD') {
			const info = this._model.getWordAtPosition({
				lineNumber: this._selection.positionLineNumber,
				column: this._selection.positionColumn
			});
			return info && info.word || undefined;

		} else if (name === 'TM_LINE_INDEX') {
			return String(this._selection.positionLineNumber - 1);

		} else if (name === 'TM_LINE_NUMBER') {
			return String(this._selection.positionLineNumber);
		}
		return undefined;
	}

	private getIndentEditsOfMovingBlock(model: ITokenizedModel, builder: IEditOperationBuilder, s: Selection, tabSize: number, insertSpaces: boolean, offset: number) {
		for (let i = s.startLineNumber; i <= s.endLineNumber; i++) {
			let lineContent = model.getLineContent(i);
			let originalIndent = strings.getLeadingWhitespace(lineContent);
			let originalSpacesCnt = IndentUtil.getSpaceCnt(originalIndent, tabSize);
			let newSpacesCnt = originalSpacesCnt + offset;
			let newIndent = IndentUtil.generateIndent(newSpacesCnt, tabSize, insertSpaces);

			if (newIndent !== originalIndent) {
				builder.addEditOperation(new Range(i, 1, i, originalIndent.length + 1), newIndent);

				if (i === s.endLineNumber && s.endColumn <= originalIndent.length + 1 && newIndent === '') {
					// as users select part of the original indent white spaces
					// when we adjust the indentation of endLine, we should adjust the cursor position as well.
					this._moveEndLineSelectionShrink = true;
				}
			}

		}
	}

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

		var modelLineCount = model.getLineCount();

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

		this._moveEndPositionDown = false;
		var 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));
		}

		let tabSize = model.getOptions().tabSize;
		let insertSpaces = model.getOptions().insertSpaces;
		let indentConverter = this.buildIndentConverter(tabSize);
		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
		};

		if (s.startLineNumber === s.endLineNumber && model.getLineMaxColumn(s.startLineNumber) === 1) {
			// Current line is empty
			var lineNumber = s.startLineNumber;
			var 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 {

			var movingLineNumber: number,
				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 + IndentUtil.getSpaceCnt(oldIndentation, tabSize);
						let newIndentation = IndentUtil.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 = IndentUtil.getSpaceCnt(indentOfMovingLine, tabSize);
							let oldSpaceCnt = IndentUtil.getSpaceCnt(oldIndentation, tabSize);
							if (newSpaceCnt !== oldSpaceCnt) {
								let newIndentation = IndentUtil.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');
//.........這裏部分代碼省略.........

	private static _enter(config: CursorConfiguration, model: ITextModel, keepPosition: boolean, range: Range): ICommand {
		if (!model.isCheapToTokenize(range.getStartPosition().lineNumber)) {
			let lineText = model.getLineContent(range.startLineNumber);
			let indentation = strings.getLeadingWhitespace(lineText).substring(0, range.startColumn - 1);
			return TypeOperations._typeCommand(range, '\n' + config.normalizeIndentation(indentation), keepPosition);
		}

		let r = LanguageConfigurationRegistry.getEnterAction(model, range);
		if (r) {
			let enterAction = r.enterAction;
			let indentation = r.indentation;

			if (enterAction.indentAction === IndentAction.None) {
				// Nothing special
				return TypeOperations._typeCommand(range, '\n' + config.normalizeIndentation(indentation + enterAction.appendText), keepPosition);

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

		// no enter rules applied, we should check indentation rules then.
		if (!config.autoIndent) {
			// Nothing special
			let lineText = model.getLineContent(range.startLineNumber);
			let indentation = strings.getLeadingWhitespace(lineText).substring(0, range.startColumn - 1);
			return TypeOperations._typeCommand(range, '\n' + config.normalizeIndentation(indentation), keepPosition);
		}

		let ir = LanguageConfigurationRegistry.getIndentForEnter(model, range, {
			unshiftIndent: (indent) => {
				return TypeOperations.unshiftIndent(config, indent);
			},
			shiftIndent: (indent) => {
				return TypeOperations.shiftIndent(config, indent);
			},
			normalizeIndentation: (indent) => {
				return config.normalizeIndentation(indent);
			}
		}, config.autoIndent);

		let lineText = model.getLineContent(range.startLineNumber);
		let indentation = strings.getLeadingWhitespace(lineText).substring(0, range.startColumn - 1);

		if (ir) {
			let oldEndViewColumn = CursorColumns.visibleColumnFromColumn2(config, model, range.getEndPosition());
			let oldEndColumn = range.endColumn;

			let beforeText = '\n';
			if (indentation !== config.normalizeIndentation(ir.beforeEnter)) {
				beforeText = config.normalizeIndentation(ir.beforeEnter) + lineText.substring(indentation.length, range.startColumn - 1) + '\n';
				range = new Range(range.startLineNumber, 1, range.endLineNumber, range.endColumn);
			}

			let newLineContent = model.getLineContent(range.endLineNumber);
			let firstNonWhitespace = strings.firstNonWhitespaceIndex(newLineContent);
			if (firstNonWhitespace >= 0) {
				range = range.setEndPosition(range.endLineNumber, Math.max(range.endColumn, firstNonWhitespace + 1));
			} else {
				range = range.setEndPosition(range.endLineNumber, model.getLineMaxColumn(range.endLineNumber));
			}

			if (keepPosition) {
				return new ReplaceCommandWithoutChangingPosition(range, beforeText + config.normalizeIndentation(ir.afterEnter), true);
			} else {
				let offset = 0;
				if (oldEndColumn <= firstNonWhitespace + 1) {
					if (!config.insertSpaces) {
						oldEndViewColumn = Math.ceil(oldEndViewColumn / config.tabSize);
					}
					offset = Math.min(oldEndViewColumn + 1 - config.normalizeIndentation(ir.afterEnter).length - 1, 0);
				}
				return new ReplaceCommandWithOffsetCursorState(range, beforeText + config.normalizeIndentation(ir.afterEnter), 0, offset, true);
			}

		} else {
			return TypeOperations._typeCommand(range, '\n' + config.normalizeIndentation(indentation), keepPosition);
		}
	}