Merge index from different header contexts (#121)

include/Server/Indexer2.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <vector>
+#include "AST/SymbolID.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/StringMap.h"
+
+namespace clice {
+
+class Indexer {
+public:
+
+private:
+    /// All paths in indexes.
+    std::vector<std::string> paths;
+
+    /// A map between path and its index.
+    llvm::StringMap<std::uint32_t> pathIndex;
+
+    /// A map between source file path and its static index file.
+    llvm::DenseMap<std::uint32_t, std::string> mapToIndex;
+
+    /// A map between symbol id and files that contains it.
+    llvm::DenseMap<std::uint64_t, std::vector<std::uint32_t>> invertedSymbolMap;
+};
+
+}  // namespace clice