lines operations strict null check.

#60565.

src/tsconfig.strictNullChecks.json

@@ -337,6 +337,7 @@
 		"./vs/editor/contrib/linesOperations/deleteLinesCommand.ts",
 		"./vs/editor/contrib/linesOperations/moveLinesCommand.ts",
 		"./vs/editor/contrib/linesOperations/sortLinesCommand.ts",
+		"./vs/editor/contrib/linesOperations/linesOperations.ts",
 		"./vs/editor/contrib/links/getLinks.ts",
 		"./vs/editor/contrib/links/links.ts",
 		"./vs/editor/contrib/markdown/markdownRenderer.ts",

src/vs/editor/common/controller/cursorTypeOperations.ts

@@ -21,7 +21,11 @@ import { IElectricAction } from 'vs/editor/common/modes/supports/electricCharact
 
 export class TypeOperations {
 
-	public static indent(config: CursorConfiguration, model: ICursorSimpleModel, selections: Selection[]): ICommand[] {
+	public static indent(config: CursorConfiguration, model: ICursorSimpleModel | null, selections: Selection[] | null): ICommand[] {
+		if (model === null || selections === null) {
+			return [];
+		}
+
 		let commands: ICommand[] = [];
 		for (let i = 0, len = selections.length; i < len; i++) {
 			commands[i] = new ShiftCommand(selections[i], {
@@ -885,7 +889,11 @@ export class TypeOperations {
 		});
 	}
 
-	public static lineInsertBefore(config: CursorConfiguration, model: ITextModel, selections: Selection[]): ICommand[] {
+	public static lineInsertBefore(config: CursorConfiguration, model: ITextModel | null, selections: Selection[] | null): ICommand[] {
+		if (model === null || selections === null) {
+			return [];
+		}
+
 		let commands: ICommand[] = [];
 		for (let i = 0, len = selections.length; i < len; i++) {
 			let lineNumber = selections[i].positionLineNumber;
@@ -902,7 +910,11 @@ export class TypeOperations {
 		return commands;
 	}
 
-	public static lineInsertAfter(config: CursorConfiguration, model: ITextModel, selections: Selection[]): ICommand[] {
+	public static lineInsertAfter(config: CursorConfiguration, model: ITextModel | null, selections: Selection[] | null): ICommand[] {
+		if (model === null || selections === null) {
+			return [];
+		}
+
 		let commands: ICommand[] = [];
 		for (let i = 0, len = selections.length; i < len; i++) {
 			const lineNumber = selections[i].positionLineNumber;

src/vs/editor/contrib/linesOperations/linesOperations.ts

@@ -249,7 +249,12 @@ export class TrimTrailingWhitespaceAction extends EditorAction {
 			cursors = (editor.getSelections() || []).map(s => new Position(s.positionLineNumber, s.positionColumn));
 		}
 
-		let command = new TrimTrailingWhitespaceCommand(editor.getSelection(), cursors);
+		let selection = editor.getSelection();
+		if (selection === null) {
+			return;
+		}
+
+		let command = new TrimTrailingWhitespaceCommand(selection, cursors);
 
 		editor.pushUndoStop();
 		editor.executeCommands(this.id, [command]);
@@ -297,7 +302,11 @@ class DeleteLinesAction extends EditorAction {
 
 	private _getLinesToRemove(editor: ICodeEditor): IDeleteLinesOperation[] {
 		// Construct delete operations
-		let operations: IDeleteLinesOperation[] = editor.getSelections().map((s) => {
+		let selections = editor.getSelections();
+		if (selections === null) {
+			return [];
+		}
+		let operations: IDeleteLinesOperation[] = selections.map((s) => {
 
 			let endLineNumber = s.endLineNumber;
 			if (s.startLineNumber < s.endLineNumber && s.endColumn === 1) {
@@ -378,7 +387,7 @@ class OutdentLinesAction extends EditorAction {
 	}
 
 	public run(_accessor: ServicesAccessor, editor: ICodeEditor): void {
-		CoreEditingCommands.Outdent.runEditorCommand(null, editor, null);
+		CoreEditingCommands.Outdent.runEditorCommand(_accessor, editor, null);
 	}
 }
 
@@ -435,6 +444,10 @@ export class InsertLineAfterAction extends EditorAction {
 export abstract class AbstractDeleteAllToBoundaryAction extends EditorAction {
 	public run(_accessor: ServicesAccessor, editor: ICodeEditor): void {
 		const primaryCursor = editor.getSelection();
+		if (primaryCursor === null) {
+			return;
+		}
+
 		let rangesToDelete = this._getRangesToDelete(editor);
 		// merge overlapping selections
 		let effectiveRanges: Range[] = [];
@@ -488,7 +501,7 @@ export class DeleteAllLeftAction extends AbstractDeleteAllToBoundaryAction {
 	}
 
 	_getEndCursorState(primaryCursor: Range, rangesToDelete: Range[]): Selection[] {
-		let endPrimaryCursor: Selection;
+		let endPrimaryCursor: Selection | null = null;
 		let endCursorState: Selection[] = [];
 		let deletedLines = 0;
 
@@ -518,15 +531,24 @@ export class DeleteAllLeftAction extends AbstractDeleteAllToBoundaryAction {
 	}
 
 	_getRangesToDelete(editor: ICodeEditor): Range[] {
-		let rangesToDelete: Range[] = editor.getSelections();
+		let selections = editor.getSelections();
+		if (selections === null) {
+			return [];
+		}
+
+		let rangesToDelete: Range[] = selections;
 		let model = editor.getModel();
 
+		if (model === null) {
+			return [];
+		}
+
 		rangesToDelete.sort(Range.compareRangesUsingStarts);
 		rangesToDelete = rangesToDelete.map(selection => {
 			if (selection.isEmpty()) {
 				if (selection.startColumn === 1) {
 					let deleteFromLine = Math.max(1, selection.startLineNumber - 1);
-					let deleteFromColumn = selection.startLineNumber === 1 ? 1 : model.getLineContent(deleteFromLine).length + 1;
+					let deleteFromColumn = selection.startLineNumber === 1 ? 1 : model!.getLineContent(deleteFromLine).length + 1;
 					return new Range(deleteFromLine, deleteFromColumn, selection.startLineNumber, 1);
 				} else {
 					return new Range(selection.startLineNumber, 1, selection.startLineNumber, selection.startColumn);
@@ -557,7 +579,7 @@ export class DeleteAllRightAction extends AbstractDeleteAllToBoundaryAction {
 	}
 
 	_getEndCursorState(primaryCursor: Range, rangesToDelete: Range[]): Selection[] {
-		let endPrimaryCursor: Selection;
+		let endPrimaryCursor: Selection | null = null;
 		let endCursorState: Selection[] = [];
 		for (let i = 0, len = rangesToDelete.length, offset = 0; i < len; i++) {
 			let range = rangesToDelete[i];
@@ -579,10 +601,19 @@ export class DeleteAllRightAction extends AbstractDeleteAllToBoundaryAction {
 
 	_getRangesToDelete(editor: ICodeEditor): Range[] {
 		let model = editor.getModel();
+		if (model === null) {
+			return [];
+		}
 
-		let rangesToDelete: Range[] = editor.getSelections().map((sel) => {
+		let selections = editor.getSelections();
+
+		if (selections === null) {
+			return [];
+		}
+
+		let rangesToDelete: Range[] = selections.map((sel) => {
 			if (sel.isEmpty()) {
-				const maxColumn = model.getLineMaxColumn(sel.startLineNumber);
+				const maxColumn = model!.getLineMaxColumn(sel.startLineNumber);
 
 				if (sel.startColumn === maxColumn) {
 					return new Range(sel.startLineNumber, sel.startColumn, sel.startLineNumber + 1, 1);
@@ -616,7 +647,14 @@ export class JoinLinesAction extends EditorAction {
 
 	public run(_accessor: ServicesAccessor, editor: ICodeEditor): void {
 		let selections = editor.getSelections();
+		if (selections === null) {
+			return;
+		}
+
 		let primaryCursor = editor.getSelection();
+		if (primaryCursor === null) {
+			return;
+		}
 
 		selections.sort(Range.compareRangesUsingStarts);
 		let reducedSelections: Selection[] = [];
@@ -624,7 +662,7 @@ export class JoinLinesAction extends EditorAction {
 		let lastSelection = selections.reduce((previousValue, currentValue) => {
 			if (previousValue.isEmpty()) {
 				if (previousValue.endLineNumber === currentValue.startLineNumber) {
-					if (primaryCursor.equalsSelection(previousValue)) {
+					if (primaryCursor!.equalsSelection(previousValue)) {
 						primaryCursor = currentValue;
 					}
 					return currentValue;
@@ -649,6 +687,10 @@ export class JoinLinesAction extends EditorAction {
 		reducedSelections.push(lastSelection);
 
 		let model = editor.getModel();
+		if (model === null) {
+			return;
+		}
+
 		let edits: IIdentifiedSingleEditOperation[] = [];
 		let endCursorState: Selection[] = [];
 		let endPrimaryCursor = primaryCursor;
@@ -759,7 +801,15 @@ export class TransposeAction extends EditorAction {
 
 	public run(_accessor: ServicesAccessor, editor: ICodeEditor): void {
 		let selections = editor.getSelections();
+		if (selections === null) {
+			return;
+		}
+
 		let model = editor.getModel();
+		if (model === null) {
+			return;
+		}
+
 		let commands: ICommand[] = [];
 
 		for (let i = 0, len = selections.length; i < len; i++) {
@@ -800,7 +850,15 @@ export class TransposeAction extends EditorAction {
 export abstract class AbstractCaseAction extends EditorAction {
 	public run(_accessor: ServicesAccessor, editor: ICodeEditor): void {
 		let selections = editor.getSelections();
+		if (selections === null) {
+			return;
+		}
+
 		let model = editor.getModel();
+		if (model === null) {
+			return;
+		}
+
 		let commands: ICommand[] = [];
 
 		for (let i = 0, len = selections.length; i < len; i++) {

src/vs/editor/contrib/linesOperations/sortLinesCommand.ts

@@ -33,7 +33,11 @@ export class SortLinesCommand implements editorCommon.ICommand {
 		return helper.getTrackedSelection(this.selectionId);
 	}
 
-	public static canRun(model: ITextModel, selection: Selection, descending: boolean): boolean {
+	public static canRun(model: ITextModel | null, selection: Selection, descending: boolean): boolean {
+		if (model === null) {
+			return false;
+		}
+
 		let data = getSortData(model, selection, descending);
 
 		if (!data) {