// Scintilla source code edit control
/** @file ExternalLexer.h
 ** Support external lexers in DLLs.
 **/
// Copyright 2001 Simon Steele <ss@pnotepad.org>, portions copyright Neil Hodgson.
// The License.txt file describes the conditions under which this software may be distributed.

#ifndef EXTERNALLEXER_H
#define EXTERNALLEXER_H

#if PLAT_WIN
#define EXT_LEXER_DECL __stdcall
#else
#define EXT_LEXER_DECL
#endif

#ifdef SCI_NAMESPACE
namespace Scintilla {
#endif

// External Lexer function definitions...
typedef void (EXT_LEXER_DECL *ExtLexerFunction)(unsigned int lexer, unsigned int startPos, int length, int initStyle,
                  char *words[], WindowID window, char *props);
typedef void (EXT_LEXER_DECL *ExtFoldFunction)(unsigned int lexer, unsigned int startPos, int length, int initStyle,
                  char *words[], WindowID window, char *props);
typedef void* (EXT_LEXER_DECL *GetLexerFunction)(unsigned int Index);
typedef int (EXT_LEXER_DECL *GetLexerCountFn)();
typedef void (EXT_LEXER_DECL *GetLexerNameFn)(unsigned int Index, char *name, int buflength);

//class DynamicLibrary;

/// Sub-class of LexerModule to use an external lexer.
class ExternalLexerModule : protected LexerModule {
protected:
	ExtLexerFunction fneLexer;
	ExtFoldFunction fneFolder;
	int externalLanguage;
	char name[100];
public:
	ExternalLexerModule(int language_, LexerFunction fnLexer_, 
		const char *languageName_=0, LexerFunction fnFolder_=0) : LexerModule(language_, fnLexer_, 0, fnFolder_){
		strncpy(name, languageName_, sizeof(name));
		languageName = name;
	};
	virtual void Lex(unsigned int startPos, int lengthDoc, int initStyle,
					WordList *keywordlists[], Accessor &styler) const;
	virtual void Fold(unsigned int startPos, int lengthDoc, int initStyle,
					WordList *keywordlists[], Accessor &styler) const;
	virtual void SetExternal(ExtLexerFunction fLexer, ExtFoldFunction fFolder, int index);
};

/// LexerMinder points to an ExternalLexerModule - so we don't leak them.
class LexerMinder {
public:
	ExternalLexerModule *self;
	LexerMinder *next;
};

/// LexerLibrary exists for every External Lexer DLL, contains LexerMinders.
class LexerLibrary {
	DynamicLibrary	*lib;
	LexerMinder		*first;
	LexerMinder		*last;

public:
	LexerLibrary(const char* ModuleName);
	~LexerLibrary();
	void Release();
	
	LexerLibrary	*next;
	SString			m_sModuleName;
};

/// 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 LexerManager *theInstance;

	void LoadLexerLibrary(const char* module);
	LexerLibrary *first;
	LexerLibrary *last;
};

class LMMinder {
public:
	~LMMinder();
};

#ifdef SCI_NAMESPACE
}
#endif

#endif
