mojom: Add associative arrays to the mojom language.

mojo/public/cpp/bindings/tests/map_unittest.cc

+// Copyright 2014 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.
+
+#include "mojo/public/cpp/bindings/array.h"
+#include "mojo/public/cpp/bindings/lib/array_serialization.h"
+#include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
+#include "mojo/public/cpp/bindings/map.h"
+#include "mojo/public/cpp/bindings/string.h"
+#include "mojo/public/cpp/environment/environment.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace mojo {
+namespace test {
+
+namespace {
+
+struct StringIntData {
+  const char* string_data;
+  int int_data;
+} kStringIntData[] = {
+  { "one", 1 },
+  { "two", 2 },
+  { "three", 3 },
+  { "four", 4 },
+};
+
+const size_t kStringIntDataSize = 4;
+
+class CopyableType {
+ public:
+  CopyableType() : copied_(false), ptr_(this) { num_instances_++; }
+  CopyableType(const CopyableType& other) : copied_(true), ptr_(other.ptr()) {
+    num_instances_++;
+  }
+  CopyableType& operator=(const CopyableType& other) {
+    copied_ = true;
+    ptr_ = other.ptr();
+    return *this;
+  }
+  ~CopyableType() { num_instances_--; }
+
+  bool copied() const { return copied_; }
+  static size_t num_instances() { return num_instances_; }
+  CopyableType* ptr() const { return ptr_; }
+  void ResetCopied() { copied_ = false; }
+
+ private:
+  bool copied_;
+  static size_t num_instances_;
+  CopyableType* ptr_;
+};
+
+size_t CopyableType::num_instances_ = 0;
+
+class MoveOnlyType {
+  MOJO_MOVE_ONLY_TYPE_FOR_CPP_03(MoveOnlyType, RValue)
+ public:
+  typedef MoveOnlyType Data_;
+  MoveOnlyType() : moved_(false), ptr_(this) { num_instances_++; }
+  MoveOnlyType(RValue other) : moved_(true), ptr_(other.object->ptr()) {
+    num_instances_++;
+  }
+  MoveOnlyType& operator=(RValue other) {
+    moved_ = true;
+    ptr_ = other.object->ptr();
+    return *this;
+  }
+  ~MoveOnlyType() { num_instances_--; }
+
+  bool moved() const { return moved_; }
+  static size_t num_instances() { return num_instances_; }
+  MoveOnlyType* ptr() const { return ptr_; }
+  void ResetMoved() { moved_ = false; }
+
+ private:
+  bool moved_;
+  static size_t num_instances_;
+  MoveOnlyType* ptr_;
+};
+
+size_t MoveOnlyType::num_instances_ = 0;
+
+class MapTest : public testing::Test {
+ public:
+  virtual ~MapTest() {}
+
+ private:
+  Environment env_;
+};
+
+// Tests that basic Map operations work.
+TEST_F(MapTest, InsertWorks) {
+  Map<String, int> map;
+  for (size_t i = 0; i < kStringIntDataSize; ++i)
+    map.insert(kStringIntData[i].string_data, kStringIntData[i].int_data);
+
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    EXPECT_EQ(kStringIntData[i].int_data,
+              map.at(kStringIntData[i].string_data));
+  }
+}
+
+TEST_F(MapTest, ConstructedFromArray) {
+  Array<String> keys(kStringIntDataSize);
+  Array<int> values(kStringIntDataSize);
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    keys[i] = kStringIntData[i].string_data;
+    values[i] = kStringIntData[i].int_data;
+  }
+
+  Map<String, int> map(keys.Pass(), values.Pass());
+
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    EXPECT_EQ(kStringIntData[i].int_data,
+              map.at(mojo::String(kStringIntData[i].string_data)));
+  }
+}
+
+TEST_F(MapTest, DecomposeMapTo) {
+  Array<String> keys(kStringIntDataSize);
+  Array<int> values(kStringIntDataSize);
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    keys[i] = kStringIntData[i].string_data;
+    values[i] = kStringIntData[i].int_data;
+  }
+
+  Map<String, int> map(keys.Pass(), values.Pass());
+  EXPECT_EQ(kStringIntDataSize, map.size());
+
+  Array<String> keys2;
+  Array<int> values2;
+  map.DecomposeMapTo(&keys2, &values2);
+  EXPECT_EQ(0u, map.size());
+
+  EXPECT_EQ(kStringIntDataSize, keys2.size());
+  EXPECT_EQ(kStringIntDataSize, values2.size());
+
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    // We are not guaranteed that the copies have the same sorting as the
+    // originals.
+    String key = kStringIntData[i].string_data;
+    int value = kStringIntData[i].int_data;
+
+    bool found = false;
+    for (size_t j = 0; j < keys2.size(); ++j) {
+      if (keys2[j] == key) {
+        EXPECT_EQ(value, values2[j]);
+        found = true;
+        break;
+      }
+    }
+
+    EXPECT_TRUE(found);
+  }
+}
+
+TEST_F(MapTest, Insert_Copyable) {
+  ASSERT_EQ(0u, CopyableType::num_instances());
+  mojo::Map<mojo::String, CopyableType> map;
+  std::vector<CopyableType*> value_ptrs;
+
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    const char* key = kStringIntData[i].string_data;
+    CopyableType value;
+    value_ptrs.push_back(value.ptr());
+    map.insert(key, value);
+    ASSERT_EQ(i + 1, map.size());
+    ASSERT_EQ(i + 1, value_ptrs.size());
+    EXPECT_EQ(map.size() + 1, CopyableType::num_instances());
+    EXPECT_TRUE(map.at(key).copied());
+    EXPECT_EQ(value_ptrs[i], map.at(key).ptr());
+    map.at(key).ResetCopied();
+    EXPECT_TRUE(map);
+  }
+
+  // std::map doesn't have a capacity() method like std::vector so this test is
+  // a lot more boring.
+
+  map.reset();
+  EXPECT_EQ(0u, CopyableType::num_instances());
+}
+
+TEST_F(MapTest, Insert_MoveOnly) {
+  ASSERT_EQ(0u, MoveOnlyType::num_instances());
+  mojo::Map<mojo::String, MoveOnlyType> map;
+  std::vector<MoveOnlyType*> value_ptrs;
+
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    const char* key = kStringIntData[i].string_data;
+    MoveOnlyType value;
+    value_ptrs.push_back(value.ptr());
+    map.insert(key, value.Pass());
+    ASSERT_EQ(i + 1, map.size());
+    ASSERT_EQ(i + 1, value_ptrs.size());
+    EXPECT_EQ(map.size() + 1, MoveOnlyType::num_instances());
+    EXPECT_TRUE(map.at(key).moved());
+    EXPECT_EQ(value_ptrs[i], map.at(key).ptr());
+    map.at(key).ResetMoved();
+    EXPECT_TRUE(map);
+  }
+
+  // std::map doesn't have a capacity() method like std::vector so this test is
+  // a lot more boring.
+
+  map.reset();
+  EXPECT_EQ(0u, CopyableType::num_instances());
+}
+
+TEST_F(MapTest, STLToMojo) {
+  std::map<std::string, int> stl_data;
+  for (size_t i = 0; i < kStringIntDataSize; ++i)
+    stl_data[kStringIntData[i].string_data] = kStringIntData[i].int_data;
+
+  Map<String, int32_t> mojo_data = Map<String, int32_t>::From(stl_data);
+
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    EXPECT_EQ(kStringIntData[i].int_data,
+              mojo_data.at(kStringIntData[i].string_data));
+  }
+}
+
+TEST_F(MapTest, MojoToSTL) {
+  Map<String, int32_t> mojo_map;
+  for (size_t i = 0; i < kStringIntDataSize; ++i)
+    mojo_map.insert(kStringIntData[i].string_data, kStringIntData[i].int_data);
+
+  std::map<std::string, int> stl_map =
+      mojo_map.To<std::map<std::string, int> >();
+  for (size_t i = 0; i < kStringIntDataSize; ++i) {
+    auto it = stl_map.find(kStringIntData[i].string_data);
+    ASSERT_TRUE(it != stl_map.end());
+    EXPECT_EQ(kStringIntData[i].int_data, it->second);
+  }
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace mojo
+