Implement Mojo message codec in JavaScript

mojo/public/bindings/js/codec_unittests.js

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+define([
+    "gtest",
+    "mojo/public/bindings/js/codec",
+    "mojo/public/bindings/js/test/sample_service"
+  ], function(gtest, codec, sample) {
+  testBar();
+  testFoo();
+  this.result = "PASS";
+
+  function barMatches(bar, expected) {
+    gtest.expectEqual(bar.alpha, expected.alpha,
+        "bar.alpha is " + bar.alpha);
+    gtest.expectEqual(bar.beta, expected.beta,
+        "bar.beta is " + bar.beta);
+    gtest.expectEqual(bar.gamma, expected.gamma,
+        "bar.gamma is " + bar.gamma);
+  }
+
+  function equalsArray(actual, expected, tag) {
+    for (var i = 0; i < expected.length; ++i) {
+      gtest.expectEqual(actual[i], expected[i],
+          tag + "[" + i + "] is " + actual[i]);
+    }
+  }
+
+  function testBar() {
+    var bar = new sample.Bar();
+    bar.alpha = 1;
+    bar.beta = 2;
+    bar.gamma = 3;
+    bar.extraProperty = "banana";
+
+    var messageName = 42;
+    var payloadSize = sample.Bar.encodedSize;
+
+    var builder = new codec.MessageBuilder(messageName, payloadSize);
+    builder.encodeStruct(sample.Bar, bar);
+
+    var message = builder.finish();
+
+    var expectedMemory = [
+      24, 0, 0, 0,
+      42, 0, 0, 0,
+
+      16, 0, 0, 0,
+       3, 0, 0, 0,
+
+       1, 2, 3, 0,
+       0, 0, 0, 0,
+    ];
+
+    for (var i = 0; i < expectedMemory.length; ++i) {
+      gtest.expectEqual(message.memory[i], expectedMemory[i],
+          "message.memory[" + i + "] is " + message.memory[i]);
+    }
+
+    var reader = new codec.MessageReader(message);
+
+    gtest.expectEqual(reader.payloadSize, payloadSize,
+        "reader.payloadSize is " + reader.payloadSize);
+    gtest.expectEqual(reader.messageName, messageName,
+        "reader.messageName is " + reader.messageName);
+
+    var bar2 = reader.decodeStruct(sample.Bar);
+
+    barMatches(bar2, bar);
+    gtest.expectFalse("extraProperty" in bar2,
+        "extraProperty appeared in bar2")
+  }
+
+  function testFoo() {
+    var foo = new sample.Foo();
+    foo.x = 0x212B4D5;
+    foo.y = 0x16E93;
+    foo.a = 1;
+    foo.b = 0;
+    foo.c = 3; // This will get truncated to one bit.
+    foo.bar = new sample.Bar();
+    foo.bar.alpha = 91;
+    foo.bar.beta = 82;
+    foo.bar.gamma = 73;
+    foo.data = [
+      4, 5, 6, 7, 8,
+    ];
+    foo.extra_bars = [
+      new sample.Bar(), new sample.Bar(), new sample.Bar(),
+    ];
+    for (var i = 0; i < foo.extra_bars.length; ++i) {
+      foo.extra_bars[i].alpha = 1 * i;
+      foo.extra_bars[i].beta = 2 * i;
+      foo.extra_bars[i].gamma = 3 * i;
+    }
+    foo.name = "I am a banana";
+    foo.files = [
+      // These are supposed to be handles, but we fake them with integers.
+      23423782, 32549823, 98320423, 38502383, 92834093,
+    ];
+
+    var messageName = 31;
+    var payloadSize = sample.Foo.encodedSize;
+
+    var builder = new codec.MessageBuilder(messageName, payloadSize);
+    builder.encodeStruct(sample.Foo, foo);
+
+    var message = builder.finish();
+
+    var expectedMemory = [
+      /*  0: */   80,    0,    0,    0,   31,    0,    0,    0,
+      /*  8: */   72,    0,    0,    0,   10,    0,    0,    0,
+      /* 16: */ 0xD5, 0xB4, 0x12, 0x02, 0x93, 0x6E, 0x01,    0,
+      /* 24: */    5,    0,    0,    0,    0,    0,    0,    0,
+      /* 32: */   48,    0,    0,    0,    0,    0,    0,    0,
+      // TODO(abarth): Test more of the message's raw memory.
+    ];
+
+    equalsArray(message.memory, expectedMemory, "message.memory");
+
+    var expectedHandles = [
+      23423782, 32549823, 98320423, 38502383, 92834093,
+    ];
+
+    equalsArray(message.handles, expectedHandles, "message.handles");
+
+    var reader = new codec.MessageReader(message);
+
+    gtest.expectEqual(reader.payloadSize, payloadSize,
+        "reader.payloadSize is " + reader.payloadSize);
+    gtest.expectEqual(reader.messageName, messageName,
+        "reader.messageName is " + reader.messageName);
+
+    var foo2 = reader.decodeStruct(sample.Foo);
+
+    gtest.expectEqual
+
+    gtest.expectEqual(foo2.x, foo.x,
+        "foo2.x is " + foo2.x);
+    gtest.expectEqual(foo2.y, foo.y,
+        "foo2.y is " + foo2.y);
+
+    gtest.expectEqual(foo2.a, foo.a & 1,
+        "foo2.a is " + foo2.a);
+    gtest.expectEqual(foo2.b, foo.b & 1,
+        "foo2.b is " + foo2.b);
+    gtest.expectEqual(foo2.c, foo.c & 1,
+        "foo2.c is " + foo2.c);
+
+    barMatches(foo2.bar, foo.bar);
+    equalsArray(foo2.data, foo.data, "foo2.data");
+
+    var actualExtraBarsJSON = JSON.stringify(foo2.extra_bars);
+    var expectedExtraBarsJSON = JSON.stringify(foo.extra_bars);
+    gtest.expectEqual(actualExtraBarsJSON, expectedExtraBarsJSON,
+        actualExtraBarsJSON);
+
+    gtest.expectEqual(foo2.name, foo.name,
+        "foo2.name is " + foo2.name);
+
+    equalsArray(foo2.files, foo.files, "foo2.files");
+  }
+});