AAPT2

First checking of AAPT2. The individual phases of AAPT2 work, but there
are some missing pieces.

For early testing we are missing:
- Need to properly mark file references and include them in package
- Need to package into zip

Final AAPT for apps we are missing:
- Need to crush PNGs
- Need to parse 9-patches
- Need to validate all of AndroidManifest.xml
- Need to write align method to align resource tables for splits.

Final AAPT for apps + system we are missing:
- Need to handle overlays
- Need to store comments for R file
- Need to handle --shared-lib (dynamic references too).

New AAPT features coming:
- Need to import compiled libraries
    - Name mangling
    - R file generation for library code

Change-Id: I95f8a63581b81a1f424ae6fb2c373c883b72c18d
diff --git a/tools/aapt2/Linker_test.cpp b/tools/aapt2/Linker_test.cpp
new file mode 100644
index 0000000..b1e201b
--- /dev/null
+++ b/tools/aapt2/Linker_test.cpp
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Linker.h"
+#include "Resolver.h"
+#include "ResourceTable.h"
+#include "ResourceValues.h"
+#include "Util.h"
+
+#include <androidfw/AssetManager.h>
+#include <gtest/gtest.h>
+#include <string>
+
+namespace aapt {
+
+struct LinkerTest : public ::testing::Test {
+    virtual void SetUp() override {
+        mTable = std::make_shared<ResourceTable>();
+        mTable->setPackage(u"android");
+        mLinker = std::make_shared<Linker>(mTable, std::make_shared<Resolver>(
+                mTable, std::make_shared<android::AssetManager>()));
+
+        // Create a few attributes for use in the tests.
+
+        addResource(ResourceName{ {}, ResourceType::kAttr, u"integer" },
+                    util::make_unique<Attribute>(false, android::ResTable_map::TYPE_INTEGER));
+
+        addResource(ResourceName{ {}, ResourceType::kAttr, u"string" },
+                    util::make_unique<Attribute>(false, android::ResTable_map::TYPE_STRING));
+
+        addResource(ResourceName{ {}, ResourceType::kId, u"apple" }, util::make_unique<Id>());
+
+        addResource(ResourceName{ {}, ResourceType::kId, u"banana" }, util::make_unique<Id>());
+
+        std::unique_ptr<Attribute> flagAttr = util::make_unique<Attribute>(
+                false, android::ResTable_map::TYPE_FLAGS);
+        flagAttr->symbols.push_back(Attribute::Symbol{
+                ResourceNameRef{ u"android", ResourceType::kId, u"apple" }, 1 });
+        flagAttr->symbols.push_back(Attribute::Symbol{
+                ResourceNameRef{ u"android", ResourceType::kId, u"banana" }, 2 });
+        addResource(ResourceName{ {}, ResourceType::kAttr, u"flags" }, std::move(flagAttr));
+    }
+
+    /*
+     * Convenience method for adding resources with the default configuration and some
+     * bogus source line.
+     */
+    bool addResource(const ResourceNameRef& name, std::unique_ptr<Value> value) {
+        return mTable->addResource(name, {}, SourceLine{ "test.xml", 21 }, std::move(value));
+    }
+
+    std::shared_ptr<ResourceTable> mTable;
+    std::shared_ptr<Linker> mLinker;
+};
+
+TEST_F(LinkerTest, DoNotInterpretEscapedStringAsReference) {
+    ASSERT_TRUE(addResource(ResourceName{ u"android", ResourceType::kString, u"foo" },
+                util::make_unique<String>(mTable->getValueStringPool().makeRef(u"?123"))));
+
+    ASSERT_TRUE(mLinker->linkAndValidate());
+    EXPECT_TRUE(mLinker->getUnresolvedReferences().empty());
+}
+
+TEST_F(LinkerTest, EscapeAndConvertRawString) {
+    std::unique_ptr<Style> style = util::make_unique<Style>();
+    style->entries.push_back(Style::Entry{
+            ResourceNameRef{ u"android", ResourceType::kAttr, u"integer" },
+            util::make_unique<RawString>(mTable->getValueStringPool().makeRef(u"  123"))
+    });
+    const Style* result = style.get();
+    ASSERT_TRUE(addResource(ResourceName{ u"android", ResourceType::kStyle, u"foo" },
+                std::move(style)));
+
+    ASSERT_TRUE(mLinker->linkAndValidate());
+    EXPECT_TRUE(mLinker->getUnresolvedReferences().empty());
+
+    EXPECT_NE(nullptr, dynamic_cast<BinaryPrimitive*>(result->entries.front().value.get()));
+}
+
+TEST_F(LinkerTest, FailToConvertRawString) {
+    std::unique_ptr<Style> style = util::make_unique<Style>();
+    style->entries.push_back(Style::Entry{
+            ResourceNameRef{ u"android", ResourceType::kAttr, u"integer" },
+            util::make_unique<RawString>(mTable->getValueStringPool().makeRef(u"yo what is up?"))
+    });
+    ASSERT_TRUE(addResource(ResourceName{ u"android", ResourceType::kStyle, u"foo" },
+                std::move(style)));
+
+    ASSERT_FALSE(mLinker->linkAndValidate());
+}
+
+TEST_F(LinkerTest, ConvertRawStringToString) {
+    std::unique_ptr<Style> style = util::make_unique<Style>();
+    style->entries.push_back(Style::Entry{
+            ResourceNameRef{ u"android", ResourceType::kAttr, u"string" },
+            util::make_unique<RawString>(
+                    mTable->getValueStringPool().makeRef(u"  \"this  is  \\u00fa\"."))
+    });
+    const Style* result = style.get();
+    ASSERT_TRUE(addResource(ResourceName{ u"android", ResourceType::kStyle, u"foo" },
+                std::move(style)));
+
+    ASSERT_TRUE(mLinker->linkAndValidate());
+    EXPECT_TRUE(mLinker->getUnresolvedReferences().empty());
+
+    const String* str = dynamic_cast<const String*>(result->entries.front().value.get());
+    ASSERT_NE(nullptr, str);
+    EXPECT_EQ(*str->value, u"this  is  \u00fa.");
+}
+
+TEST_F(LinkerTest, ConvertRawStringToFlags) {
+    std::unique_ptr<Style> style = util::make_unique<Style>();
+    style->entries.push_back(Style::Entry{
+            ResourceNameRef{ u"android", ResourceType::kAttr, u"flags" },
+            util::make_unique<RawString>(mTable->getValueStringPool().makeRef(u"banana | apple"))
+    });
+    const Style* result = style.get();
+    ASSERT_TRUE(addResource(ResourceName{ u"android", ResourceType::kStyle, u"foo" },
+                std::move(style)));
+
+    ASSERT_TRUE(mLinker->linkAndValidate());
+    EXPECT_TRUE(mLinker->getUnresolvedReferences().empty());
+
+    const BinaryPrimitive* bin = dynamic_cast<const BinaryPrimitive*>(
+            result->entries.front().value.get());
+    ASSERT_NE(nullptr, bin);
+    EXPECT_EQ(bin->value.data, 1u | 2u);
+}
+
+} // namespace aapt