AAPT2: Remove usage of u16string

For legacy reasons, we kept around the use of UTF-16 internally
in AAPT2. We don't need this and this CL removes all instances of
std::u16string and StringPiece16. The only places still needed
are when interacting with the ResTable APIs that only operate in
UTF16.

Change-Id: I492475b84bb9014fa13bf992cff447ee7a5fe588
diff --git a/tools/aapt2/link/TableMerger_test.cpp b/tools/aapt2/link/TableMerger_test.cpp
index 4a80d3f..1697217 100644
--- a/tools/aapt2/link/TableMerger_test.cpp
+++ b/tools/aapt2/link/TableMerger_test.cpp
@@ -30,13 +30,13 @@
     void SetUp() override {
         mContext = test::ContextBuilder()
                 // We are compiling this package.
-                .setCompilationPackage(u"com.app.a")
+                .setCompilationPackage("com.app.a")
 
                 // Merge all packages that have this package ID.
                 .setPackageId(0x7f)
 
                 // Mangle all packages that do not have this package name.
-                .setNameManglerPolicy(NameManglerPolicy{ u"com.app.a", { u"com.app.b" } })
+                .setNameManglerPolicy(NameManglerPolicy{ "com.app.a", { "com.app.b" } })
 
                 .build();
     }
@@ -44,17 +44,17 @@
 
 TEST_F(TableMergerTest, SimpleMerge) {
     std::unique_ptr<ResourceTable> tableA = test::ResourceTableBuilder()
-            .setPackageId(u"com.app.a", 0x7f)
-            .addReference(u"@com.app.a:id/foo", u"@com.app.a:id/bar")
-            .addReference(u"@com.app.a:id/bar", u"@com.app.b:id/foo")
-            .addValue(u"@com.app.a:styleable/view", test::StyleableBuilder()
-                    .addItem(u"@com.app.b:id/foo")
+            .setPackageId("com.app.a", 0x7f)
+            .addReference("@com.app.a:id/foo", "@com.app.a:id/bar")
+            .addReference("@com.app.a:id/bar", "@com.app.b:id/foo")
+            .addValue("@com.app.a:styleable/view", test::StyleableBuilder()
+                    .addItem("@com.app.b:id/foo")
                     .build())
             .build();
 
     std::unique_ptr<ResourceTable> tableB = test::ResourceTableBuilder()
-            .setPackageId(u"com.app.b", 0x7f)
-            .addSimple(u"@com.app.b:id/foo")
+            .setPackageId("com.app.b", 0x7f)
+            .addSimple("@com.app.b:id/foo")
             .build();
 
     ResourceTable finalTable;
@@ -62,20 +62,20 @@
     io::FileCollection collection;
 
     ASSERT_TRUE(merger.merge({}, tableA.get()));
-    ASSERT_TRUE(merger.mergeAndMangle({}, u"com.app.b", tableB.get(), &collection));
+    ASSERT_TRUE(merger.mergeAndMangle({}, "com.app.b", tableB.get(), &collection));
 
-    EXPECT_TRUE(merger.getMergedPackages().count(u"com.app.b") != 0);
+    EXPECT_TRUE(merger.getMergedPackages().count("com.app.b") != 0);
 
     // Entries from com.app.a should not be mangled.
-    AAPT_EXPECT_TRUE(finalTable.findResource(test::parseNameOrDie(u"@com.app.a:id/foo")));
-    AAPT_EXPECT_TRUE(finalTable.findResource(test::parseNameOrDie(u"@com.app.a:id/bar")));
-    AAPT_EXPECT_TRUE(finalTable.findResource(test::parseNameOrDie(u"@com.app.a:styleable/view")));
+    AAPT_EXPECT_TRUE(finalTable.findResource(test::parseNameOrDie("@com.app.a:id/foo")));
+    AAPT_EXPECT_TRUE(finalTable.findResource(test::parseNameOrDie("@com.app.a:id/bar")));
+    AAPT_EXPECT_TRUE(finalTable.findResource(test::parseNameOrDie("@com.app.a:styleable/view")));
 
     // The unmangled name should not be present.
-    AAPT_EXPECT_FALSE(finalTable.findResource(test::parseNameOrDie(u"@com.app.b:id/foo")));
+    AAPT_EXPECT_FALSE(finalTable.findResource(test::parseNameOrDie("@com.app.b:id/foo")));
 
     // Look for the mangled name.
-    AAPT_EXPECT_TRUE(finalTable.findResource(test::parseNameOrDie(u"@com.app.a:id/com.app.b$foo")));
+    AAPT_EXPECT_TRUE(finalTable.findResource(test::parseNameOrDie("@com.app.a:id/com.app.b$foo")));
 }
 
 TEST_F(TableMergerTest, MergeFile) {
@@ -86,17 +86,17 @@
 
     ResourceFile fileDesc;
     fileDesc.config = test::parseConfigOrDie("hdpi-v4");
-    fileDesc.name = test::parseNameOrDie(u"@layout/main");
+    fileDesc.name = test::parseNameOrDie("@layout/main");
     fileDesc.source = Source("res/layout-hdpi/main.xml");
     test::TestFile testFile("path/to/res/layout-hdpi/main.xml.flat");
 
     ASSERT_TRUE(merger.mergeFile(fileDesc, &testFile));
 
     FileReference* file = test::getValueForConfig<FileReference>(&finalTable,
-                                                                 u"@com.app.a:layout/main",
+                                                                 "@com.app.a:layout/main",
                                                                  test::parseConfigOrDie("hdpi-v4"));
     ASSERT_NE(nullptr, file);
-    EXPECT_EQ(std::u16string(u"res/layout-hdpi-v4/main.xml"), *file->path);
+    EXPECT_EQ(std::string("res/layout-hdpi-v4/main.xml"), *file->path);
 }
 
 TEST_F(TableMergerTest, MergeFileOverlay) {
@@ -106,7 +106,7 @@
     TableMerger merger(mContext.get(), &finalTable, tableMergerOptions);
 
     ResourceFile fileDesc;
-    fileDesc.name = test::parseNameOrDie(u"@xml/foo");
+    fileDesc.name = test::parseNameOrDie("@xml/foo");
     test::TestFile fileA("path/to/fileA.xml.flat");
     test::TestFile fileB("path/to/fileB.xml.flat");
 
@@ -116,12 +116,12 @@
 
 TEST_F(TableMergerTest, MergeFileReferences) {
     std::unique_ptr<ResourceTable> tableA = test::ResourceTableBuilder()
-            .setPackageId(u"com.app.a", 0x7f)
-            .addFileReference(u"@com.app.a:xml/file", u"res/xml/file.xml")
+            .setPackageId("com.app.a", 0x7f)
+            .addFileReference("@com.app.a:xml/file", "res/xml/file.xml")
             .build();
     std::unique_ptr<ResourceTable> tableB = test::ResourceTableBuilder()
-            .setPackageId(u"com.app.b", 0x7f)
-            .addFileReference(u"@com.app.b:xml/file", u"res/xml/file.xml")
+            .setPackageId("com.app.b", 0x7f)
+            .addFileReference("@com.app.b:xml/file", "res/xml/file.xml")
             .build();
 
     ResourceTable finalTable;
@@ -130,25 +130,25 @@
     collection.insertFile("res/xml/file.xml");
 
     ASSERT_TRUE(merger.merge({}, tableA.get()));
-    ASSERT_TRUE(merger.mergeAndMangle({}, u"com.app.b", tableB.get(), &collection));
+    ASSERT_TRUE(merger.mergeAndMangle({}, "com.app.b", tableB.get(), &collection));
 
-    FileReference* f = test::getValue<FileReference>(&finalTable, u"@com.app.a:xml/file");
+    FileReference* f = test::getValue<FileReference>(&finalTable, "@com.app.a:xml/file");
     ASSERT_NE(f, nullptr);
-    EXPECT_EQ(std::u16string(u"res/xml/file.xml"), *f->path);
+    EXPECT_EQ(std::string("res/xml/file.xml"), *f->path);
 
-    f = test::getValue<FileReference>(&finalTable, u"@com.app.a:xml/com.app.b$file");
+    f = test::getValue<FileReference>(&finalTable, "@com.app.a:xml/com.app.b$file");
     ASSERT_NE(f, nullptr);
-    EXPECT_EQ(std::u16string(u"res/xml/com.app.b$file.xml"), *f->path);
+    EXPECT_EQ(std::string("res/xml/com.app.b$file.xml"), *f->path);
 }
 
 TEST_F(TableMergerTest, OverrideResourceWithOverlay) {
     std::unique_ptr<ResourceTable> base = test::ResourceTableBuilder()
-            .setPackageId(u"", 0x00)
-            .addValue(u"@bool/foo", ResourceUtils::tryParseBool(u"true"))
+            .setPackageId("", 0x00)
+            .addValue("@bool/foo", ResourceUtils::tryParseBool("true"))
             .build();
     std::unique_ptr<ResourceTable> overlay = test::ResourceTableBuilder()
-            .setPackageId(u"", 0x00)
-            .addValue(u"@bool/foo", ResourceUtils::tryParseBool(u"false"))
+            .setPackageId("", 0x00)
+            .addValue("@bool/foo", ResourceUtils::tryParseBool("false"))
             .build();
 
     ResourceTable finalTable;
@@ -159,19 +159,19 @@
     ASSERT_TRUE(merger.merge({}, base.get()));
     ASSERT_TRUE(merger.mergeOverlay({}, overlay.get()));
 
-    BinaryPrimitive* foo = test::getValue<BinaryPrimitive>(&finalTable, u"@com.app.a:bool/foo");
+    BinaryPrimitive* foo = test::getValue<BinaryPrimitive>(&finalTable, "@com.app.a:bool/foo");
     ASSERT_NE(nullptr, foo);
     EXPECT_EQ(0x0u, foo->value.data);
 }
 
 TEST_F(TableMergerTest, MergeAddResourceFromOverlay) {
     std::unique_ptr<ResourceTable> tableA = test::ResourceTableBuilder()
-            .setPackageId(u"", 0x7f)
-            .setSymbolState(u"@bool/foo", {}, SymbolState::kUndefined)
+            .setPackageId("", 0x7f)
+            .setSymbolState("@bool/foo", {}, SymbolState::kUndefined)
             .build();
     std::unique_ptr<ResourceTable> tableB = test::ResourceTableBuilder()
-            .setPackageId(u"", 0x7f)
-            .addValue(u"@bool/foo", ResourceUtils::tryParseBool(u"true"))
+            .setPackageId("", 0x7f)
+            .addValue("@bool/foo", ResourceUtils::tryParseBool("true"))
             .build();
 
     ResourceTable finalTable;
@@ -183,11 +183,11 @@
 
 TEST_F(TableMergerTest, MergeAddResourceFromOverlayWithAutoAddOverlay) {
     std::unique_ptr<ResourceTable> tableA = test::ResourceTableBuilder()
-            .setPackageId(u"", 0x7f)
+            .setPackageId("", 0x7f)
             .build();
     std::unique_ptr<ResourceTable> tableB = test::ResourceTableBuilder()
-            .setPackageId(u"", 0x7f)
-            .addValue(u"@bool/foo", ResourceUtils::tryParseBool(u"true"))
+            .setPackageId("", 0x7f)
+            .addValue("@bool/foo", ResourceUtils::tryParseBool("true"))
             .build();
 
     ResourceTable finalTable;
@@ -201,11 +201,11 @@
 
 TEST_F(TableMergerTest, FailToMergeNewResourceWithoutAutoAddOverlay) {
     std::unique_ptr<ResourceTable> tableA = test::ResourceTableBuilder()
-            .setPackageId(u"", 0x7f)
+            .setPackageId("", 0x7f)
             .build();
     std::unique_ptr<ResourceTable> tableB = test::ResourceTableBuilder()
-            .setPackageId(u"", 0x7f)
-            .addValue(u"@bool/foo", ResourceUtils::tryParseBool(u"true"))
+            .setPackageId("", 0x7f)
+            .addValue("@bool/foo", ResourceUtils::tryParseBool("true"))
             .build();
 
     ResourceTable finalTable;