Mojo JS Bindings: add support for associative arrays (Mojo map type)

mojo/public/js/bindings/struct_unittests.js

Index: mojo/public/js/bindings/struct_unittests.js
diff --git a/mojo/public/js/bindings/struct_unittests.js b/mojo/public/js/bindings/struct_unittests.js
index 2d7abe513c253d8a760041a55efbb1d1ab2aefb6..b5d14bae26a9e3d7cf32c63eb441cce6317bf47c 100644
--- a/mojo/public/js/bindings/struct_unittests.js
+++ b/mojo/public/js/bindings/struct_unittests.js
@@ -5,10 +5,12 @@
 define([
     "gin/test/expect",
     "mojo/public/interfaces/bindings/tests/rect.mojom",
-    "mojo/public/interfaces/bindings/tests/test_structs.mojom"
+    "mojo/public/interfaces/bindings/tests/test_structs.mojom",
+    "mojo/public/js/bindings/codec",
 ], function(expect,
             rect,
-            testStructs) {
+            testStructs,
+            codec) {
 
   function testConstructors() {
     var r = new rect.Rect();
@@ -93,9 +95,44 @@ define([
     expect(s.f6).toEqual(10);
   }
 
+  function structEncodeDecode(struct) {
+    var structClass = struct.constructor;
+    var builder = new codec.MessageBuilder(1234, structClass.encodedSize);
+    builder.encodeStruct(structClass, struct);
+    var reader = new codec.MessageReader(builder.finish());
+    return reader.decodeStruct(structClass);
+  }
+
+  function testMapFields() {
+    var mapFieldsStruct = new testStructs.MapFields({
+      f0: new Map([[true, false], [false, true]]), // map<bool, bool>
+      f1: new Map([[0, 0], [1, 127], [-1, -128]]), // map<int8, int8>
+      f2: new Map([[0, 0], [1, 127], [2, 255]]), // map<uint8, uint8>
+      f3: new Map([[0, 0], [1, 32767], [2, -32768]]), // map<int16, int16>
+      f4: new Map([[0, 0], [1, 32768], [2, 0xFFFF]]), // map<uint16, uint16>
+      f5: new Map([[0, 0], [1, 32767], [2, -32768]]), // map<int32, int32>
+      f6: new Map([[0, 0], [1, 32768], [2, 0xFFFF]]), // map<uint32, uint32>
+      f7: new Map([[1000.5, -50000], [100.5, 5000]]), // map<float, float>
+      f8: new Map([[-100.5, -50000], [0, 50000000]]), // map<double, double>
+      f9: new Map([["one", "two"], ["free", "four"]]), // map<string, string>
+    });
+    var decodedStruct = structEncodeDecode(mapFieldsStruct);
+    expect(decodedStruct.f0).toEqual(mapFieldsStruct.f0);
+    expect(decodedStruct.f1).toEqual(mapFieldsStruct.f1);
+    expect(decodedStruct.f2).toEqual(mapFieldsStruct.f2);
+    expect(decodedStruct.f3).toEqual(mapFieldsStruct.f3);
+    expect(decodedStruct.f4).toEqual(mapFieldsStruct.f4);
+    expect(decodedStruct.f5).toEqual(mapFieldsStruct.f5);
+    expect(decodedStruct.f6).toEqual(mapFieldsStruct.f6);
+    expect(decodedStruct.f7).toEqual(mapFieldsStruct.f7);
+    expect(decodedStruct.f8).toEqual(mapFieldsStruct.f8);
+    expect(decodedStruct.f9).toEqual(mapFieldsStruct.f9);
+  }
+
   testConstructors();
   testNoDefaultFieldValues();
   testDefaultFieldValues();
   testScopedConstants();
+  testMapFields();
   this.result = "PASS";
 });