1 files changed, 70 insertions, 0 deletions
diff --git a/src/ExternalLexer.cxx b/src/ExternalLexer.cxx
index 4f2ab987b..b35e8962a 100644
--- a/src/ExternalLexer.cxx
+++ b/src/ExternalLexer.cxx
@@ -26,6 +26,66 @@
 
 using namespace Scintilla;
 
+#if PLAT_WIN
+#define EXT_LEXER_DECL __stdcall
+#else
+#define EXT_LEXER_DECL
+#endif
+
+namespace {
+
+typedef int (EXT_LEXER_DECL *GetLexerCountFn)();
+typedef void (EXT_LEXER_DECL *GetLexerNameFn)(unsigned int Index, char *name, int buflength);
+typedef LexerFactoryFunction(EXT_LEXER_DECL *GetLexerFactoryFunction)(unsigned int Index);
+
+/// Sub-class of LexerModule to use an external lexer.
+class ExternalLexerModule : public LexerModule {
+protected:
+	GetLexerFactoryFunction fneFactory;
+	std::string name;
+public:
+	ExternalLexerModule(int language_, LexerFunction fnLexer_,
+		const char *languageName_=nullptr, LexerFunction fnFolder_=nullptr) :
+		LexerModule(language_, fnLexer_, nullptr, fnFolder_),
+		fneFactory(nullptr), name(languageName_){
+		languageName = name.c_str();
+	}
+	virtual void SetExternal(GetLexerFactoryFunction fFactory, int index);
+};
+
+/// LexerLibrary exists for every External Lexer DLL, contains ExternalLexerModules.
+class LexerLibrary {
+	std::unique_ptr<DynamicLibrary> lib;
+	std::vector<std::unique_ptr<ExternalLexerModule>> modules;
+public:
+	explicit LexerLibrary(const char *moduleName_);
+	~LexerLibrary();
+
+	std::string moduleName;
+};
+
+/// LexerManager manages external lexers, contains LexerLibrarys.
+class LexerManager {
+public:
+	~LexerManager();
+
+	static LexerManager *GetInstance();
+	static void DeleteInstance();
+
+	void Load(const char *path);
+	void Clear();
+
+private:
+	LexerManager();
+	static std::unique_ptr<LexerManager> theInstance;
+	std::vector<std::unique_ptr<LexerLibrary>> libraries;
+};
+
+class LMMinder {
+public:
+	~LMMinder();
+};
+
 std::unique_ptr<LexerManager> LexerManager::theInstance;
 
 //------------------------------------------
@@ -133,3 +193,13 @@ LMMinder::~LMMinder() {
 }
 
 LMMinder minder;
+
+}
+
+namespace Scintilla {
+
+void ExternalLexerLoad(const char *path) {
+	LexerManager::GetInstance()->Load(path);
+}
+
+}