add refactor of convert private field to getter and setter

src/compiler/core.ts

@@ -3118,8 +3118,8 @@ namespace ts {
         return (arg: T) => f(arg) && g(arg);
     }
 
-    export function or<T>(f: (arg: T) => boolean, g: (arg: T) => boolean) {
-        return (arg: T) => f(arg) || g(arg);
+    export function or<T>(f: (arg: T) => boolean, g: (arg: T) => boolean, ...others: ((arg: T) => boolean)[]) {
+        return (arg: T) => f(arg) || g(arg) || others.some(f => f(arg));
     }
 
     export function assertTypeIsNever(_: never): void { } // tslint:disable-line no-empty

src/compiler/diagnosticMessages.json

@@ -4134,5 +4134,9 @@
     "Convert all constructor functions to classes": {
         "category": "Message",
         "code": 95045
+    },
+    "Generate 'get' and 'set' accessors": {
+        "category": "Message",
+        "code": 95046
     }
 }

src/compiler/utilities.ts

@@ -4238,7 +4238,7 @@ namespace ts {
         }
     }
 
-    export function isParameterPropertyDeclaration(node: Node): boolean {
+    export function isParameterPropertyDeclaration(node: Node): node is ParameterDeclaration {
         return hasModifier(node, ModifierFlags.ParameterPropertyModifier) && node.parent.kind === SyntaxKind.Constructor && isClassLike(node.parent.parent);
     }
 

src/services/refactors/extractSymbol.ts

@@ -701,14 +701,6 @@ namespace ts.refactor.extractSymbol {
         Global,
     }
 
-    function getUniqueName(baseName: string, fileText: string): string {
-        let nameText = baseName;
-        for (let i = 1; stringContains(fileText, nameText); i++) {
-            nameText = `${baseName}_${i}`;
-        }
-        return nameText;
-    }
-
     /**
      * Result of 'extractRange' operation for a specific scope.
      * Stores either a list of changes that should be applied to extract a range or a list of errors
@@ -1129,37 +1121,6 @@ namespace ts.refactor.extractSymbol {
         }
     }
 
-    /**
-     * @return The index of the (only) reference to the extracted symbol.  We want the cursor
-     * to be on the reference, rather than the declaration, because it's closer to where the
-     * user was before extracting it.
-     */
-    function getRenameLocation(edits: ReadonlyArray<FileTextChanges>, renameFilename: string, functionNameText: string, isDeclaredBeforeUse: boolean): number {
-        let delta = 0;
-        let lastPos = -1;
-        for (const { fileName, textChanges } of edits) {
-            Debug.assert(fileName === renameFilename);
-            for (const change of textChanges) {
-                const { span, newText } = change;
-                const index = newText.indexOf(functionNameText);
-                if (index !== -1) {
-                    lastPos = span.start + delta + index;
-
-                    // If the reference comes first, return immediately.
-                    if (!isDeclaredBeforeUse) {
-                        return lastPos;
-                    }
-                }
-                delta += newText.length - span.length;
-            }
-        }
-
-        // If the declaration comes first, return the position of the last occurrence.
-        Debug.assert(isDeclaredBeforeUse);
-        Debug.assert(lastPos >= 0);
-        return lastPos;
-    }
-
     function getFirstDeclaration(type: Type): Declaration | undefined {
         let firstDeclaration;
 

src/services/refactors/generateGetAccessorAndSetAccessor.ts

@@ -0,0 +1,252 @@
+/* @internal */
+namespace ts.refactor.generateGetAccessorAndSetAccessor {
+    const actionName = "Generate 'get' and 'set' accessors";
+    const actionDescription = Diagnostics.Generate_get_and_set_accessors.message;
+    registerRefactor(actionName, { getEditsForAction, getAvailableActions });
+
+    type AccepedDeclaration = ParameterDeclaration | PropertyDeclaration | PropertyAssignment;
+    type AccepedNameType = Identifier | StringLiteral;
+    type ContainerDeclation = ClassLikeDeclaration | ObjectLiteralExpression;
+
+    interface DeclarationInfo {
+        container: ContainerDeclation;
+        isStatic: boolean;
+        type: TypeNode | undefined;
+    }
+
+    interface Info extends DeclarationInfo {
+        declaration: AccepedDeclaration;
+        fieldName: AccepedNameType;
+        accessorName: AccepedNameType;
+    }
+
+    function getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined {
+        const { file, startPosition } = context;
+        if (!getConvertibleFieldAtPosition(file, startPosition)) return undefined;
+
+        return [{
+            name: actionName,
+            description: actionDescription,
+            actions: [
+                {
+                    name: actionName,
+                    description: actionDescription
+                }
+            ]
+        }];
+    }
+
+    function getEditsForAction(context: RefactorContext, _actionName: string): RefactorEditInfo | undefined {
+        const { file, startPosition } = context;
+
+        const fieldInfo = getConvertibleFieldAtPosition(file, startPosition);
+        if (!fieldInfo) return undefined;
+
+        const isJS = isSourceFileJavaScript(file);
+        const changeTracker = textChanges.ChangeTracker.fromContext(context);
+        const { isStatic, fieldName, accessorName, type, container, declaration } = fieldInfo;
+
+        const isInClassLike = isClassLike(container);
+        const accessorModifiers = getAccessorModifiers(isJS, declaration, isStatic, isInClassLike);
+        const fieldModifiers = getFieldModifiers(isJS, isStatic, isInClassLike);
+
+        updateFieldDeclaration(changeTracker, file, declaration, fieldName, fieldModifiers, container);
+
+        const getAccessor = generateGetAccessor(fieldName, accessorName, type, accessorModifiers, isStatic, container);
+        const setAccessor = generateSetAccessor(fieldName, accessorName, type, accessorModifiers, isStatic, container);
+
+        insertAccessor(changeTracker, file, getAccessor, declaration, container);
+        insertAccessor(changeTracker, file, setAccessor, declaration, container);
+
+        const edits = changeTracker.getChanges();
+        const renameFilename = file.fileName;
+        const renameLocationOffset = isIdentifier(fieldName) ? 0 : -1;
+        const renameLocation = renameLocationOffset + getRenameLocation(edits, renameFilename, fieldName.text, /*isDeclaredBeforeUse*/ false);
+        return { renameFilename, renameLocation, edits };
+    }
+
+    function isConvertableName (name: DeclarationName): name is AccepedNameType {
+        return isIdentifier(name) || isStringLiteral(name);
+    }
+
+    function createPropertyName (name: string, originalName: AccepedNameType) {
+        return isIdentifier(originalName) ? createIdentifier(name) : createLiteral(name);
+    }
+
+    function createAccessorAccessExpression (fieldName: AccepedNameType, isStatic: boolean, container: ContainerDeclation) {
+        const leftHead = isStatic ? (<ClassLikeDeclaration>container).name : createThis();
+        return isIdentifier(fieldName) ? createPropertyAccess(leftHead, fieldName) : createElementAccess(leftHead, createLiteral(fieldName));
+    }
+
+    function getAccessorModifiers(isJS: boolean, declaration: AccepedDeclaration, isStatic: boolean, isClassLike: boolean): NodeArray<Modifier> | undefined {
+        if (!isClassLike) return undefined;
+
+        if (!declaration.modifiers || getModifierFlags(declaration) & ModifierFlags.Private) {
+            const modifiers = append<Modifier>(
+                !isJS ? [createToken(SyntaxKind.PublicKeyword)] : undefined,
+                isStatic ? createToken(SyntaxKind.StaticKeyword) : undefined
+            );
+            return modifiers && createNodeArray(modifiers);
+        }
+        return declaration.modifiers;
+    }
+
+    function getFieldModifiers(isJS: boolean, isStatic: boolean, isClassLike: boolean): NodeArray<Modifier> | undefined {
+        if (!isClassLike) return undefined;
+
+        const modifiers = append<Modifier>(
+            !isJS ? [createToken(SyntaxKind.PrivateKeyword)] : undefined,
+            isStatic ? createToken(SyntaxKind.StaticKeyword) : undefined
+        );
+        return modifiers && createNodeArray(modifiers);
+    }
+
+    function getPropertyDeclarationInfo(propertyDeclaration: PropertyDeclaration): DeclarationInfo | undefined {
+        if (!isClassLike(propertyDeclaration.parent) || !propertyDeclaration.parent.members) return undefined;
+
+        return {
+            isStatic: hasStaticModifier(propertyDeclaration),
+            type: propertyDeclaration.type,
+            container: propertyDeclaration.parent
+        };
+    }
+
+    function getParameterPropertyDeclarationInfo(parameterDeclaration: ParameterDeclaration): DeclarationInfo | undefined {
+        if (!isClassLike(parameterDeclaration.parent.parent) || !parameterDeclaration.parent.parent.members) return undefined;
+
+        return {
+            isStatic: false,
+            type: parameterDeclaration.type,
+            container: parameterDeclaration.parent.parent
+        };
+    }
+
+    function getPropertyAssignmentDeclarationInfo(propertyAssignment: PropertyAssignment): DeclarationInfo | undefined {
+        return {
+            isStatic: false,
+            type: undefined,
+            container: propertyAssignment.parent
+        };
+    }
+
+    function getDeclarationInfo(declaration: AccepedDeclaration) {
+        if (isPropertyDeclaration(declaration)) {
+            return getPropertyDeclarationInfo(declaration);
+        }
+        else if (isPropertyAssignment(declaration)) {
+            return getPropertyAssignmentDeclarationInfo(declaration);
+        }
+        else {
+            return getParameterPropertyDeclarationInfo(declaration);
+        }
+    }
+
+    function getConvertibleFieldAtPosition(file: SourceFile, startPosition: number): Info | undefined {
+        const node = getTokenAtPosition(file, startPosition, /*includeJsDocComment*/ false);
+        const declaration = <AccepedDeclaration>findAncestor(node.parent, or(isParameterPropertyDeclaration, isPropertyDeclaration, isPropertyAssignment));
+        // make sure propertyDeclaration have AccessibilityModifier or Static Modifier
+        const meaning = ModifierFlags.AccessibilityModifier | ModifierFlags.Static;
+        if (!declaration || !isConvertableName(declaration.name) || (getModifierFlags(declaration) | meaning) !== meaning) return undefined;
+
+        const info = getDeclarationInfo(declaration);
+        const fieldName = createPropertyName(getUniqueName(`_${declaration.name.text}`, file.text), declaration.name);
+        suppressLeadingAndTrailingTrivia(fieldName);
+        suppressLeadingAndTrailingTrivia(declaration);
+        return {
+            ...info,
+            declaration,
+            fieldName,
+            accessorName: createPropertyName(declaration.name.text, declaration.name)
+        };
+    }
+
+    function generateGetAccessor(fieldName: AccepedNameType, accessorName: AccepedNameType, type: TypeNode, modifiers: ModifiersArray | undefined, isStatic: boolean, container: ContainerDeclation) {
+        return createGetAccessor(
+            /*decorators*/ undefined,
+            modifiers,
+            accessorName,
+            /*parameters*/ undefined,
+            type,
+            createBlock([
+                createReturn(
+                    createAccessorAccessExpression(fieldName, isStatic, container)
+                )
+            ], /*multiLine*/ true)
+        );
+    }
+
+    function generateSetAccessor(fieldName: AccepedNameType, accessorName: AccepedNameType, type: TypeNode, modifiers: ModifiersArray | undefined, isStatic: boolean, container: ContainerDeclation) {
+        return createSetAccessor(
+            /*decorators*/ undefined,
+            modifiers,
+            accessorName,
+            [createParameter(
+                /*decorators*/ undefined,
+                /*modifiers*/ undefined,
+                /*dotDotDotToken*/ undefined,
+                createIdentifier("value"),
+                /*questionToken*/ undefined,
+                type
+            )],
+            createBlock([
+                createStatement(
+                    createAssignment(
+                        createAccessorAccessExpression(fieldName, isStatic, container),
+                        createIdentifier("value")
+                    )
+                )
+            ], /*multiLine*/ true)
+        );
+    }
+
+    function updatePropertyDeclaration(changeTracker: textChanges.ChangeTracker, file: SourceFile, declaration: PropertyDeclaration, fieldName: AccepedNameType, modifiers: ModifiersArray | undefined) {
+        const property = updateProperty(
+            declaration,
+            declaration.decorators,
+            modifiers,
+            fieldName,
+            declaration.questionToken || declaration.exclamationToken,
+            declaration.type,
+            declaration.initializer
+        );
+
+        changeTracker.replaceNode(file, declaration, property);
+    }
+
+    function updateParameterPropertyDeclaration(changeTracker: textChanges.ChangeTracker, file: SourceFile, declaration: ParameterDeclaration, fieldName: AccepedNameType, modifiers: ModifiersArray | undefined, classLikeContainer: ClassLikeDeclaration) {
+        const property = createProperty(
+            declaration.decorators,
+            modifiers,
+            fieldName,
+            declaration.questionToken,
+            declaration.type,
+            declaration.initializer
+        );
+
+        changeTracker.insertNodeAtClassStart(file, classLikeContainer, property);
+        changeTracker.deleteNodeInList(file, declaration);
+    }
+
+    function updatePropertyAssignmentDeclaration (changeTracker: textChanges.ChangeTracker, file: SourceFile, declaration: PropertyAssignment, fieldName: AccepedNameType) {
+        const assignment = updatePropertyAssignment(declaration, fieldName, declaration.initializer);
+        changeTracker.replacePropertyAssignment(file, declaration, assignment);
+    }
+
+    function updateFieldDeclaration(changeTracker: textChanges.ChangeTracker, file: SourceFile, declaration: AccepedDeclaration, fieldName: AccepedNameType, modifiers: ModifiersArray | undefined, container: ContainerDeclation) {
+        if (isPropertyDeclaration(declaration)) {
+            updatePropertyDeclaration(changeTracker, file, declaration, fieldName, modifiers);
+        }
+        else if (isPropertyAssignment(declaration)) {
+            updatePropertyAssignmentDeclaration(changeTracker, file, declaration, fieldName);
+        }
+        else {
+            updateParameterPropertyDeclaration(changeTracker, file, declaration, fieldName, modifiers, <ClassLikeDeclaration>container);
+        }
+    }
+
+    function insertAccessor(changeTracker: textChanges.ChangeTracker, file: SourceFile, accessor: AccessorDeclaration, declaration: AccepedDeclaration, container: ContainerDeclation) {
+        isParameterPropertyDeclaration(declaration)
+            ? changeTracker.insertNodeAtClassStart(file, <ClassLikeDeclaration>container, accessor)
+            : changeTracker.insertNodeAfter(file, declaration, accessor);
+    }
+}

src/services/refactors/refactors.ts

@@ -1 +1,2 @@
 /// <reference path="extractSymbol.ts" />
+/// <reference path="generateGetAccessorAndSetAccessor.ts" />

src/services/textChanges.ts

@@ -316,6 +316,12 @@ namespace ts.textChanges {
             return this.replaceRangeWithNodes(sourceFile, getAdjustedRange(sourceFile, startNode, endNode, options), newNodes, options);
         }
 
+        public replacePropertyAssignment(sourceFile: SourceFile, oldNode: PropertyAssignment, newNode: PropertyAssignment) {
+            return this.replaceNode(sourceFile, oldNode, newNode, {
+                suffix: "," + this.newLineCharacter
+            });
+        }
+
         private insertNodeAt(sourceFile: SourceFile, pos: number, newNode: Node, options: InsertNodeOptions = {}) {
             this.replaceRange(sourceFile, createTextRange(pos), newNode, options);
         }
@@ -462,6 +468,9 @@ namespace ts.textChanges {
             else if (isVariableDeclaration(node)) {
                 return { prefix: ", " };
             }
+            else if (isPropertyAssignment(node)) {
+                return { suffix: "," + this.newLineCharacter };
+            }
             else if (isParameter(node)) {
                 return {};
             }