ccls/src/semantic_highlight_symbol_cache.h

#pragma once

#include "lru_cache.h"
#include "query.h"

#include <optional.h>

#include <string>
#include <unordered_map>

// Caches symbols for a single file for semantic highlighting to provide
// relatively stable ids. Only supports xxx files at a time.
struct SemanticHighlightSymbolCache {
  struct Entry {
    SemanticHighlightSymbolCache* all_caches_ = nullptr;

    // The path this cache belongs to.
    std::string path;
    // Detailed symbol name to stable id.
    using TNameToId = std::unordered_map<std::string, int>;
    TNameToId detailed_type_name_to_stable_id;
    TNameToId detailed_func_name_to_stable_id;
    TNameToId detailed_var_name_to_stable_id;

    Entry(SemanticHighlightSymbolCache* all_caches, const std::string& path);

    optional<int> TryGetStableId(SymbolKind kind,
                                 const std::string& detailed_name);
    int GetStableId(SymbolKind kind, const std::string& detailed_name);

    TNameToId* GetMapForSymbol_(SymbolKind kind);
  };

  constexpr static int kCacheSize = 10;
  LruCache<std::string, Entry> cache_;
  uint32_t next_stable_id_ = 0;

  SemanticHighlightSymbolCache();

  std::shared_ptr<Entry> GetCacheForFile(const std::string& path);
};