Add Metadata to Transformer tooling

This change adds a Metadata field to ASTEdit, Edit, and AtomicChange so that
edits can have associated metadata and that metadata can be constructed with
Transformer-based RewriteRules. Metadata is ignored when applying edits to
source, but other consumers of AtomicChange can use this metadata to direct how
they want to consume each edit.

Reviewed By: ymandel, gribozavr2

Differential Revision: https://reviews.llvm.org/D82226

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/unittests/Tooling/RefactoringTest.cpp b/clang/unittests/Tooling/RefactoringTest.cpp
index d65c6db..97a26a7 100644
--- a/clang/unittests/Tooling/RefactoringTest.cpp
+++ b/clang/unittests/Tooling/RefactoringTest.cpp
@@ -1296,6 +1296,18 @@ TEST_F(AtomicChangeTest, InsertAfterWithInvalidLocation) {
       Replacement(Context.Sources, SourceLocation(), 0, "b")));
 }
 
+TEST_F(AtomicChangeTest, Metadata) {
+  AtomicChange Change(Context.Sources, DefaultLoc, 17);
+  const llvm::Any &Metadata = Change.getMetadata();
+  ASSERT_TRUE(llvm::any_isa<int>(Metadata));
+  EXPECT_EQ(llvm::any_cast<int>(Metadata), 17);
+}
+
+TEST_F(AtomicChangeTest, NoMetadata) {
+  AtomicChange Change(Context.Sources, DefaultLoc);
+  EXPECT_FALSE(Change.getMetadata().hasValue());
+}
+
 class ApplyAtomicChangesTest : public ::testing::Test {
 protected:
   ApplyAtomicChangesTest() : FilePath("file.cc") {