Repo created

libs/coding/transliteration.hpp

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <atomic>
+#include <cstdint>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <string>
+
+// From ICU library, either 3party/icu or from the system's package.
+#include <unicode/uversion.h>
+
+U_NAMESPACE_BEGIN
+class UnicodeString;
+U_NAMESPACE_END
+
+class Transliteration
+{
+public:
+  enum class Mode
+  {
+    Enabled,
+    Disabled
+  };
+
+  ~Transliteration();
+
+  static Transliteration & Instance();
+
+  void Init(std::string const & icuDataDir);
+
+  void SetMode(Mode mode);
+  // Transliterates |sv| with transliterators set for |langCode| in StringUtf8Multilang
+  // if mode is set to Enabled.
+  bool Transliterate(std::string_view sv, int8_t langCode, std::string & out) const;
+
+  // Transliterates |str| with |transliteratorId|, ignores mode.
+  bool TransliterateForce(std::string const & str, std::string const & transliteratorId, std::string & out) const;
+
+private:
+  struct TransliteratorInfo;
+
+  Transliteration();
+
+  bool Transliterate(std::string_view transID, icu::UnicodeString & ustr) const;
+
+  std::mutex m_initializationMutex;
+  std::atomic<bool> m_inited;
+  std::atomic<Mode> m_mode;
+  std::map<std::string_view, std::unique_ptr<TransliteratorInfo>> m_transliterators;
+};