Prevents loading data models repeatedly.

Source/Engine/McBopomofoLM.cpp

@@ -39,6 +39,11 @@ McBopomofoLM::~McBopomofoLM()
     m_phraseReplacement.close();
 }
 
+bool McBopomofoLM::isDataModelLoaded()
+{
+    return m_languageModel.isLoaded();
+}
+
 void McBopomofoLM::loadLanguageModel(const char* languageModelDataPath)
 {
     if (languageModelDataPath) {

Source/Engine/McBopomofoLM.h

@@ -64,6 +64,8 @@ public:
     /// Asks to load the primary language model a the given path.
     /// @param languageModelPath Thw path of the language model.
     void loadLanguageModel(const char* languageModelPath);
+    /// If the data model is already loaded.
+    bool isDataModelLoaded();
     /// Asks to load the user phrases and excluded phrases at the given path.
     /// @param userPhrasesPath The path of user phrases.
     /// @param excludedPhrasesPath The path of excluded phrases.

Source/Engine/ParselessLM.cpp

@@ -32,6 +32,14 @@
 
 McBopomofo::ParselessLM::~ParselessLM() { close(); }
 
+bool McBopomofo::ParselessLM::isLoaded()
+{
+    if (data_) {
+        return true;
+    }
+    return false;
+}
+
 bool McBopomofo::ParselessLM::open(const std::string_view& path)
 {
     if (data_) {

Source/Engine/ParselessLM.h

@@ -37,6 +37,7 @@ class ParselessLM : public Formosa::Gramambular::LanguageModel {
 public:
     ~ParselessLM() override;
 
+    bool isLoaded();
     bool open(const std::string_view& path);
     void close();
 

Source/LanguageModelManager.mm

@@ -55,18 +55,26 @@ static void LTLoadLanguageModelFile(NSString *filenameWithoutExtension, McBopomo
 
 + (void)loadDataModels
 {
+    if (!gLanguageModelMcBopomofo.isDataModelLoaded()) {
         LTLoadLanguageModelFile(@"data", gLanguageModelMcBopomofo);
+    }
+    if (!gLanguageModelPlainBopomofo.isDataModelLoaded()) {
         LTLoadLanguageModelFile(@"data-plain-bpmf", gLanguageModelPlainBopomofo);
+    }
 }
 
 + (void)loadDataModel:(InputMode)mode
 {
     if ([mode isEqualToString:InputModeBopomofo]) {
+        if (!gLanguageModelMcBopomofo.isDataModelLoaded()) {
             LTLoadLanguageModelFile(@"data", gLanguageModelMcBopomofo);
         }
+    }
     if ([mode isEqualToString:InputModePlainBopomofo]) {
+        if (!gLanguageModelPlainBopomofo.isDataModelLoaded()) {
             LTLoadLanguageModelFile(@"data-plain-bpmf", gLanguageModelPlainBopomofo);
         }
+    }
 }
 
 + (void)loadUserPhrases