Merge pull request swiftwasm#98 from swiftwasm/katei/jsvalue-convenience-methods

[Proposal] Add unsafe convenience methods for JSValue

Author: kateinoigakukun

IntegrationTests/TestSuites/Sources/PrimaryTests/main.swift

@@ -268,14 +268,26 @@ try test("Call Function With This") {
     // ```
     let objectConstructor = try expectFunction(getJSValue(this: .global, name: "Animal"))
     let cat1 = objectConstructor.new("Tama", 3, true)
+    let cat1Value = JSValue.object(cat1)
     let getIsCat = try expectFunction(getJSValue(this: cat1, name: "getIsCat"))
+    let setName = try expectFunction(getJSValue(this: cat1, name: "setName"))
 
     // Direct call without this
     try expectEqual(getIsCat(), .undefined)
 
     // Call with this
     let gotIsCat = getIsCat(this: cat1)
     try expectEqual(gotIsCat, .boolean(true))
+    try expectEqual(cat1.getIsCat!(), .boolean(true))
+    try expectEqual(cat1Value.getIsCat(), .boolean(true))
+
+    // Call with this and argument
+    setName(this: cat1, JSValue.string("Shiro"))
+    try expectEqual(getJSValue(this: cat1, name: "name"), .string("Shiro"))
+    _ = cat1.setName!("Tora")
+    try expectEqual(getJSValue(this: cat1, name: "name"), .string("Tora"))
+    _ = cat1Value.setName("Chibi")
+    try expectEqual(getJSValue(this: cat1, name: "name"), .string("Chibi"))
 }
 
 try test("Object Conversion") {
@@ -496,3 +508,12 @@ try test("Error") {
     try expectEqual(JSError(from: .string("error"))?.description, nil)
     try expectEqual(JSError(from: .object(error.jsObject))?.description, expectedDescription)
 }
+
+try test("JSValue accessor") {
+    let globalObject1 = JSObject.global.globalObject1
+    try expectEqual(globalObject1.prop_1.nested_prop, .number(1))
+    try expectEqual(globalObject1.object!.prop_1.object!.nested_prop, .number(1))
+
+    try expectEqual(globalObject1.prop_4[0], .number(3))
+    try expectEqual(globalObject1.prop_4[1], .number(4))
+}

IntegrationTests/bin/primary-tests.js

@@ -48,6 +48,9 @@ global.Animal = function (name, age, isCat) {
     this.getIsCat = function () {
         return this.isCat;
     };
+    this.setName = function (name) {
+        this.name = name;
+    }
 };
 
 const { startWasiTask } = require("../lib");

Sources/JavaScriptKit/JSValue.swift

@@ -1,6 +1,7 @@
 import _CJavaScriptKit
 
 /// `JSValue` represents a value in JavaScript.
+@dynamicMemberLookup
 public enum JSValue: Equatable {
     case boolean(Bool)
     case string(JSString)
@@ -79,6 +80,28 @@ public enum JSValue: Equatable {
     }
 }
 
+extension JSValue {
+    /// An unsafe convenience method of `JSObject.subscript(_ name: String) -> ((ConvertibleToJSValue...) -> JSValue)?`
+    /// - Precondition: `self` must be a JavaScript Object and specified member should be a callable object.
+    public subscript(dynamicMember name: String) -> ((ConvertibleToJSValue...) -> JSValue) {
+        object![dynamicMember: name]!
+    }
+
+    /// An unsafe convenience method of `JSObject.subscript(_ index: Int) -> JSValue`
+    /// - Precondition: `self` must be a JavaScript Object.
+    public subscript(dynamicMember name: String) -> JSValue {
+        get { self.object![name] }
+        set { self.object![name] = newValue }
+    }
+
+    /// An unsafe convenience method of `JSObject.subscript(_ index: Int) -> JSValue`
+    /// - Precondition: `self` must be a JavaScript Object.
+    public subscript(_ index: Int) -> JSValue {
+        get { object![index] }
+        set { object![index] = newValue }
+    }
+}
+
 extension JSValue {
     public func fromJSValue<Type>() -> Type? where Type: ConstructibleFromJSValue {
         return Type.construct(from: self)