HelpGen/src/scriptbinder.h

/////////////////////////////////////////////////////////////////////////////
// Name:        No names yet.
// Purpose:     Contrib. demo
// Author:      Aleksandras Gluchovas
// Modified by:
// Created:     22/09/98
// RCS-ID:      $Id: scriptbinder.h 34519 2005-06-02 09:44:45Z ABX $
// Copyright:   (c) Aleskandars Gluchovas
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef __SCRIPTBINDER_G__
#define __SCRIPTBINDER_G__

#if defined( wxUSE_TEMPLATE_STL )

    #include <vector>

    #ifdef WIN32
        #include <bstring.h>
    #else
        #include <strclass.h>
        #include <string.h>
    #endif

#else

    #include "wxstlvec.h"
    #include "wx/string.h"

#endif

#ifndef ASSERT
// assert yourself
#define ASSERT(x) if (!(x) ) throw;
#endif

#include "markup.h"

// just another portable stream class...

class ScriptStream
{
protected:
    char*  m_pBuf;
    size_t m_Size;
    size_t m_Capacity;
public:
    ScriptStream();
    ~ScriptStream();

    void WriteBytes( const void* srcBuf, size_t count );

    ScriptStream& operator<<( const char* str );
    ScriptStream& operator<<( const wxString& str );
    ScriptStream& operator<<( char ch );

    void endl();

    inline char*  GetBuf() { return m_pBuf; }
    inline size_t GetBufSize() { return m_Size; }

    // clears current contents of the stream
    void Reset() { m_Size = 0; }
};


class ScriptTemplate;

// used internally by ScriptTemplate

enum TEMPLATE_VARIABLE_TYPES
{
    TVAR_INTEGER,
    TVAR_STRING,
    TVAR_DOUBLE,
    TVAR_REF_ARRAY
};

// helper structures used only by ScriptTemplate

struct TVarInfo
{
public:
    const char*     m_Name;
    int             m_Type;
    int             m_Ofs;

    TVarInfo( const char* name, int ofs, int varType )
        : m_Name(name),
          m_Type( varType ),
          m_Ofs( ofs )
    {}
};

struct TArrayInfo : public TVarInfo
{
public:
    int m_RefOfs;
    int m_SizeIntOfs;
    int m_ObjRefTemplOfs;

    TArrayInfo( const char* name )
        : TVarInfo( name, 0, TVAR_REF_ARRAY )
    {}
};

// stores offset of the given member (of the given class)
// to (*pOfs), though the use of template classes would have
// solved this problem in much clearer fashion

// FOR NOW:: obtaining physical offset of class member
//           does not appeare to be protable across compilers?
// FIXME::   +/- 1 problem

#ifdef __UNIX__
    #define WEIRD_OFFSET 1
#else
    #define WEIRD_OFFSET 0

#endif

#define GET_VAR_OFS( className, varName, pOfs )          \
    {                                                    \
        int* className::* varPtr;                        \
        varPtr = (int* className::*)&className::varName; \
                                                         \
        (*pOfs) = int(*(int*)&varPtr)-WEIRD_OFFSET;      \
    }

class ScriptSection;

#if defined( wxUSE_TEMPLATE_STL )

    typedef vector<TVarInfo*> TVarListT;

    // container class for sections
    typedef vector<ScriptSection*> SectListT;

#else

    typedef TVarInfo*      TVarInfoPtrT;
    typedef ScriptSection* ScriptSectionPtrT;

    typedef WXSTL_VECTOR_SHALLOW_COPY(TVarInfoPtrT) TVarListT;

    // container class for sections
    typedef WXSTL_VECTOR_SHALLOW_COPY(ScriptSectionPtrT) SectListT;

#endif

// class performs preprocessing of arbitrary scripts,
// replaces identifiers enclosed in $(..) tag, whith
// values of the corresponding class member variables

class ScriptTemplate
{
protected:
    // do not use wxString object here - parsing of
    // C string can be much faster (in debug v.)
    char*     m_TText;

    TVarListT m_Vars;

    inline void PrintVar( TVarInfo*     pInfo,
                          void*         dataObj,
                          ScriptStream& stm );

public:
    ScriptTemplate( const wxString& templateText );
    virtual ~ScriptTemplate();

    bool HasVar( const char* name );

    // Member variables registration methods.

    // NOTE:: GET_VAR_OFS() macro should be used
    // to get offset of the class member (see #define above)
    void AddStringVar ( const char* name, int ofs );
    void AddIntegerVar( const char* name, int ofs );
    void AddDoubleVar ( const char* name, int ofs );

    void AddObjectRefArray( const char*     name,
                            int             ofsRefToFirstObj,
                            int             ofsObjSizeInt,
                            int             ofsObjRefTempl
                          );

    // reads the script, replaces $(..) tags with values
    // of registered members of dataObj object, and outputs
    // the result to given text stream

    void PrintScript( void* dataObj, ScriptStream& stm );
};

class ScriptSection;

// class manages section and aggregated sections of
// inter-linked documents

class ScriptSection
{
protected:

    // NOTE:: "$(NAME)", $(ID), "$(BODY)" and "$(REFLIST)" are
    //        reseved template variables of ScriptSection

    // the below there members are registered to ScriptTemplate,
    // GUID within the section tree (numeric)

    ScriptSection*  m_pParent;
    wxString        m_Id;   // $(ID)
    wxString        m_Name;// $(NAME)
    wxString        m_Body; // $(BODY)

    // NULL, if this section is not aggregated anywhere

    SectListT       m_Subsections; // aggregated sectons
    SectListT       m_References;  // registered as $(REFLIST)

    bool            m_AutoHide;  // see autoHide arg, in constructor
    bool            m_SortOn;    // true, if sort subsectons by naem

    // tempalte for this section
    ScriptTemplate* m_pSectTempl;

    // template used for links (or references) to this section
    ScriptTemplate* m_pRefTempl;

    // do not call destructor of this object,
    // call RemoveRef() instead
    int             m_RefCount;

    static int      m_IdCounter;  // generator of GUIDs

    // fields registered and used by ScriptTemplate object
    void*           m_RefFirst;
    int             m_ArrSize;

protected:
    virtual void AddRef();
    virtual void RemoveRef();
    void DoRemoveEmptySections(int& nRemoved, SectListT& removedLst);
    void DoRemoveDeadLinks( SectListT& removedLst);

public:

    // NOTE:: pass NULL to certain template, if your sure
    //        this kind of template will never be used,
    //        e.g. if section is contained but never referrenced,
    //        then pReferenceTemplate can be NULL

    // if autoHide option is true, the section will be automatically
    // collapsed (not shown) if it doesn't contain any references
    // to other sections (e.g. could be usefull for autoamically
    // hiding empty index-sections).

    ScriptSection( const wxString& name = wxEmptyString,
                   const wxString& body = wxEmptyString,
                   ScriptTemplate* pSectionTemplate   = NULL,
                   ScriptTemplate* pReferenceTemplate = NULL,
                   bool            autoHide           = false,
                   bool            sorted             = false
                 );

    // calls RemoveRef() to all aggreagated sections first,
    // then to all referenced section - this way all
    // sections (even not aggregated ones) become "garbage-collected"

    // NOTE:: do not call destructor directlly, call RemoveRef()
    //        instead
    virtual ~ScriptSection();


    // if addToReferencesToo is true, section is aggregated and
    // also added to reference list of this section

    void AddSection( ScriptSection* pSection, bool addToReferencesToo = false );

    // add cross-reference to this given section
    void AddReference( ScriptSection* pReferredSection );

    // subsection may be given of variable depth level,
    // e.g. "publications/reviews/software"

    ScriptSection* GetSubsection( const char* name );

    // returns list aggregated sections
    SectListT& GetSubsections();

    // binds reserved template names ( $(..) ) to member
    // vairalbes in the ScriptSection class, should be called
    // to initialize each user-code provided script template

    static void RegisterTemplate( ScriptTemplate& sectionTempalte );

    // prints out section tree to the stream, starting from
    // this section as a root node
    virtual void Print( ScriptStream& stm );

    // searches empty sections which has autoHide == true,
    // and colapses them (this method should be called )
    // on the root-section of the sections tree

    // NOTE:: does not work properly, yet!
    void RemoveEmptySections();
};

// base class for documnetation generators
// (allows user code set up target script type,
//  independently of documentation type)

class DocGeneratorBase
{
protected:
    MarkupTagsT    m_Tags;

    // override this method to do some post processing
    // after generation of document, or even write some
    // data into output stream, before the section tree
    // is flushed into it.

    // return false, if something has gone wrong and
    // document cannot be saved now

    virtual bool OnSaveDocument( ScriptStream& WXUNUSED(stm) )
        { return 1; }

    // override this method to provide reference to
    // the top section of the document (used as default
    // starting section when saving a document)

    virtual ScriptSection* GetTopSection()
        { return 0; }

public:

    DocGeneratorBase()
        : m_Tags(0) // no defaul script
    {}

    // dectrouctors of polymorphic classes SHOULD be virtual
    virtual ~DocGeneratorBase() {}

    // returns tags, being used for specific target script
    MarkupTagsT GetScriptMarkupTags() { return m_Tags; }

    // sets tag array for specific script

    // NOTE:: Why virtual? since approach with MarkupTagsT is
    //        "flowless" only in theory. Overriding this method
    //        allows document generators to check the type of the
    //        target script, and perhaps make some modifications
    //        to generator's tamplates, to match the specific script

    virtual void SetScriptMarkupTags( MarkupTagsT tags )
        { m_Tags = tags; }

    // seves document to file starting from the root-node of
    // the document (provided by GetTopSection() method),
    // or from "pFromSection" if it's not NULL.

    // fopenOptions arg. is string passed to fopen() method,
    // returns true, if saving was successful

    virtual bool SaveDocument( const char*    fname,
                               const char*    fopenOptions = "w",
                               ScriptSection* pFromSection = NULL
                             );

};

#endif