AAPT2: Move comments and source into Value

Values are closely related to where they were defined, so
this information should live inside the Value.

This also enables comments to be attached to nested Values.

Change-Id: Ic7481b5a5f26d0ef248d638e2e29252f88154581
diff --git a/tools/aapt2/link/TableMerger.cpp b/tools/aapt2/link/TableMerger.cpp
index db52546..636c2ba 100644
--- a/tools/aapt2/link/TableMerger.cpp
+++ b/tools/aapt2/link/TableMerger.cpp
@@ -19,6 +19,7 @@
 #include "ValueVisitor.h"
 
 #include "link/TableMerger.h"
+#include "util/Comparators.h"
 #include "util/Util.h"
 
 #include <cassert>
@@ -120,27 +121,24 @@
             }
 
             for (ResourceConfigValue& srcValue : srcEntry->values) {
-                auto cmp = [](const ResourceConfigValue& a,
-                              const ConfigDescription& b) -> bool {
-                    return a.config < b;
-                };
-
                 auto iter = std::lower_bound(dstEntry->values.begin(), dstEntry->values.end(),
-                                             srcValue.config, cmp);
+                                             srcValue.config, cmp::lessThan);
 
                 if (iter != dstEntry->values.end() && iter->config == srcValue.config) {
                     const int collisionResult = ResourceTable::resolveValueCollision(
                             iter->value.get(), srcValue.value.get());
                     if (collisionResult == 0) {
                         // Error!
-                        ResourceNameRef resourceName =
-                                { srcPackage->name, srcType->type, srcEntry->name };
-                        mContext->getDiagnostics()->error(DiagMessage(srcValue.source)
+                        ResourceNameRef resourceName(srcPackage->name,
+                                                     srcType->type,
+                                                     srcEntry->name);
+
+                        mContext->getDiagnostics()->error(DiagMessage(srcValue.value->getSource())
                                                           << "resource '" << resourceName
                                                           << "' has a conflicting value for "
                                                           << "configuration ("
                                                           << srcValue.config << ")");
-                        mContext->getDiagnostics()->note(DiagMessage(iter->source)
+                        mContext->getDiagnostics()->note(DiagMessage(iter->value->getSource())
                                                          << "originally defined here");
                         error = true;
                         continue;
@@ -150,16 +148,12 @@
                     }
 
                 } else {
-                    // Insert a new value.
-                    iter = dstEntry->values.insert(iter,
-                                                   ResourceConfigValue{ srcValue.config });
+                    // Insert a place holder value. We will fill it in below.
+                    iter = dstEntry->values.insert(iter, ResourceConfigValue{ srcValue.config });
                 }
 
-                iter->source = std::move(srcValue.source);
-                iter->comment = std::move(srcValue.comment);
                 if (manglePackage) {
-                    iter->value = cloneAndMangle(srcTable, srcPackage->name,
-                                                 srcValue.value.get());
+                    iter->value = cloneAndMangle(srcTable, srcPackage->name, srcValue.value.get());
                 } else {
                     iter->value = clone(srcValue.value.get());
                 }
@@ -179,7 +173,11 @@
             std::u16string mangledEntry = NameMangler::mangleEntry(package, entry.toString());
             std::u16string newPath = prefix.toString() + mangledEntry + suffix.toString();
             mFilesToMerge.push(FileToMerge{ table, *f->path, newPath });
-            return util::make_unique<FileReference>(mMasterTable->stringPool.makeRef(newPath));
+            std::unique_ptr<FileReference> fileRef = util::make_unique<FileReference>(
+                    mMasterTable->stringPool.makeRef(newPath));
+            fileRef->setComment(f->getComment());
+            fileRef->setSource(f->getSource());
+            return std::move(fileRef);
         }
     }
     return clone(value);