TypeScript ITokenizedModel.isCheapToTokenize方法代碼示例

	private static _isAutoIndentType(config: CursorConfiguration, model: ITokenizedModel, selections: Selection[]): boolean {
		if (!config.autoIndent) {
			return false;
		}

		for (let i = 0, len = selections.length; i < len; i++) {
			if (!model.isCheapToTokenize(selections[i].getEndPosition().lineNumber)) {
				return false;
			}
		}

		return true;
	}

	private shouldAutoIndent(model: ITokenizedModel, 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 static tab(config: CursorConfiguration, model: ITokenizedModel, 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,
					oneIndent: config.oneIndent,
					useTabStops: config.useTabStops
				});
			}
		}
		return commands;
	}

	public getEditOperations(model: ITokenizedModel, builder: IEditOperationBuilder): void {
		const startLine = this._selection.startLineNumber;

		let endLine = this._selection.endLineNumber;
		if (this._selection.endColumn === 1 && startLine !== endLine) {
			endLine = endLine - 1;
		}

		const tabSize = this._opts.tabSize;
		const oneIndent = this._opts.oneIndent;
		const shouldIndentEmptyLines = (startLine === endLine);

		// if indenting or outdenting on a whitespace only line
		if (this._selection.isEmpty()) {
			if (/^\s*$/.test(model.getLineContent(startLine))) {
				this._useLastEditRangeForCursorEndPosition = true;
			}
		}

		if (this._opts.useTabStops) {
			// indents[i] represents i * oneIndent
			let indents: string[] = ['', oneIndent];

			// keep track of previous line's "miss-alignment"
			let previousLineExtraSpaces = 0, extraSpaces = 0;
			for (let lineNumber = startLine; lineNumber <= endLine; lineNumber++ , previousLineExtraSpaces = extraSpaces) {
				extraSpaces = 0;
				let lineText = model.getLineContent(lineNumber);
				let indentationEndIndex = strings.firstNonWhitespaceIndex(lineText);

				if (this._opts.isUnshift && (lineText.length === 0 || indentationEndIndex === 0)) {
					// empty line or line with no leading whitespace => nothing to do
					continue;
				}

				if (!shouldIndentEmptyLines && !this._opts.isUnshift && lineText.length === 0) {
					// do not indent empty lines => nothing to do
					continue;
				}

				if (indentationEndIndex === -1) {
					// the entire line is whitespace
					indentationEndIndex = lineText.length;
				}

				if (lineNumber > 1) {
					let contentStartVisibleColumn = CursorColumns.visibleColumnFromColumn(lineText, indentationEndIndex + 1, tabSize);
					if (contentStartVisibleColumn % tabSize !== 0) {
						// The current line is "miss-aligned", so let's see if this is expected...
						// This can only happen when it has trailing commas in the indent
						if (model.isCheapToTokenize(lineNumber - 1)) {
							let enterAction = LanguageConfigurationRegistry.getRawEnterActionAtPosition(model, lineNumber - 1, model.getLineMaxColumn(lineNumber - 1));
							if (enterAction) {
								extraSpaces = previousLineExtraSpaces;
								if (enterAction.appendText) {
									for (let j = 0, lenJ = enterAction.appendText.length; j < lenJ && extraSpaces < tabSize; j++) {
										if (enterAction.appendText.charCodeAt(j) === CharCode.Space) {
											extraSpaces++;
										} else {
											break;
										}
									}
								}
								if (enterAction.removeText) {
									extraSpaces = Math.max(0, extraSpaces - enterAction.removeText);
								}

								// Act as if `prefixSpaces` is not part of the indentation
								for (let j = 0; j < extraSpaces; j++) {
									if (indentationEndIndex === 0 || lineText.charCodeAt(indentationEndIndex - 1) !== CharCode.Space) {
										break;
									}
									indentationEndIndex--;
								}
							}
						}
					}
				}


				if (this._opts.isUnshift && indentationEndIndex === 0) {
					// line with no leading whitespace => nothing to do
					continue;
				}

				let desiredIndentCount: number;
				if (this._opts.isUnshift) {
					desiredIndentCount = ShiftCommand.unshiftIndentCount(lineText, indentationEndIndex + 1, tabSize);
				} else {
					desiredIndentCount = ShiftCommand.shiftIndentCount(lineText, indentationEndIndex + 1, tabSize);
				}

				// Fill `indents`, as needed
				for (let j = indents.length; j <= desiredIndentCount; j++) {
					indents[j] = indents[j - 1] + oneIndent;
				}

				this._addEditOperation(builder, new Range(lineNumber, 1, lineNumber, indentationEndIndex + 1), indents[desiredIndentCount]);
				if (lineNumber === startLine) {
					// Force the startColumn to stay put because we're inserting after it
//.........這裏部分代碼省略.........

	private static _isTypeInterceptorElectricChar(config: CursorConfiguration, model: ITokenizedModel, selections: Selection[]) {
		if (selections.length === 1 && model.isCheapToTokenize(selections[0].getEndPosition().lineNumber)) {
			return true;
		}
		return false;
	}

	private static _isAutoClosingOpenCharType(config: CursorConfiguration, model: ITokenizedModel, selections: Selection[], ch: string): boolean {
		if (!config.autoClosingBrackets || !config.autoClosingPairsOpen.hasOwnProperty(ch)) {
			return false;
		}

		for (let i = 0, len = selections.length; i < len; i++) {
			const selection = selections[i];
			if (!selection.isEmpty()) {
				return false;
			}

			const position = selection.getPosition();
			const lineText = model.getLineContent(position.lineNumber);

			// Do not auto-close ' or " after a word character
			if ((ch === '\'' || ch === '"') && position.column > 1) {
				const wordSeparators = getMapForWordSeparators(config.wordSeparators);
				const characterBeforeCode = lineText.charCodeAt(position.column - 2);
				const characterBeforeType = wordSeparators.get(characterBeforeCode);
				if (characterBeforeType === WordCharacterClass.Regular) {
					return false;
				}
			}

			// Only consider auto closing the pair if a space follows or if another autoclosed pair follows
			const characterAfter = lineText.charAt(position.column - 1);
			if (characterAfter) {
				const thisBraceIsSymmetric = (config.autoClosingPairsOpen[ch] === ch);

				let isBeforeCloseBrace = false;
				for (let otherCloseBrace in config.autoClosingPairsClose) {
					const otherBraceIsSymmetric = (config.autoClosingPairsOpen[otherCloseBrace] === otherCloseBrace);
					if (!thisBraceIsSymmetric && otherBraceIsSymmetric) {
						continue;
					}
					if (characterAfter === otherCloseBrace) {
						isBeforeCloseBrace = true;
						break;
					}
				}
				if (!isBeforeCloseBrace && !/\s/.test(characterAfter)) {
					return false;
				}
			}

			if (!model.isCheapToTokenize(position.lineNumber)) {
				// Do not force tokenization
				return false;
			}

			model.forceTokenization(position.lineNumber);
			const lineTokens = model.getLineTokens(position.lineNumber);

			let shouldAutoClosePair = false;
			try {
				shouldAutoClosePair = LanguageConfigurationRegistry.shouldAutoClosePair(ch, lineTokens, position.column);
			} catch (e) {
				onUnexpectedError(e);
			}

			if (!shouldAutoClosePair) {
				return false;
			}
		}

		return true;
	}

	private static _enter(config: CursorConfiguration, model: ITokenizedModel, 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);
		}
	}