[clang] [ClangRepl] Type Directed Code Completion (PR #67349)

[Vassil Vassilev via cfe-commits]

================
@@ -56,26 +69,151 @@ class ReplCompletionConsumer : public CodeCompleteConsumer {
   std::shared_ptr<GlobalCodeCompletionAllocator> CCAllocator;
   CodeCompletionTUInfo CCTUInfo;
   std::vector<std::string> &Results;
+  ReplCodeCompleter &CC;
+};
+
+/*
+  The abstract class CompletionContextHandler contains four interfaces, each of
+  which handles one type of completion result.
+
+  Its substract classes are used to create concrete handlers based on
+  CodeCompletionContext.
+ */
+class CompletionContextHandler {
+protected:
+  CodeCompletionContext CCC;
+  std::vector<std::string> &Results;
+
+public:
+  CompletionContextHandler(CodeCompletionContext CCC,
+                           std::vector<std::string> &Results)
+      : CCC(CCC), Results(Results) {}
+
+  // convert a Declaration completion result  to a completion string, and then store it in Results.
+  virtual void handleDeclaration(const CodeCompletionResult &Result) {}
+
+  // convert a Keyword completion result  to a completion string, and then store it in Results.
+  virtual void handleKeyword(const CodeCompletionResult &Result) {}
+
+  // convert a Pattern completion result  to a completion string, and then store it in Results.
+  virtual void handlePattern(const CodeCompletionResult &Result) {}
+
+  // convert a Macro completion result  to a completion string, and then store it in Results.
----------------
vgvassilev wrote:

```suggestion
  // Converts a Macro completion result to a completion string, and then store it in Results.
```

https://github.com/llvm/llvm-project/pull/67349