// 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
#elif PLAT_GTK
#define EXT_LEXER_DECL 
#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();
};

#endif
