helpdata.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        helpdata.cpp
// Purpose:     wxHtmlHelpData
// Notes:       Based on htmlhelp.cpp, implementing a monolithic
//              HTML Help controller class,  by Vaclav Slavik
// Author:      Harm van der Heijden and Vaclav Slavik
// RCS-ID:      $Id: helpdata.cpp,v 1.79 2005/01/06 11:52:05 RR Exp $
// Copyright:   (c) Harm van der Heijden and Vaclav Slavik
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "helpdata.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#include "wx/defs.h"

#if wxUSE_HTML && wxUSE_STREAMS

#ifndef WXPRECOMP
    #include "wx/intl.h"
    #include "wx/log.h"
#endif

#include <ctype.h>

#include "wx/html/helpdata.h"
#include "wx/tokenzr.h"
#include "wx/wfstream.h"
#include "wx/busyinfo.h"
#include "wx/encconv.h"
#include "wx/fontmap.h"
#include "wx/log.h"
#include "wx/html/htmlpars.h"
#include "wx/html/htmldefs.h"
#include "wx/html/htmlfilt.h"
#include "wx/filename.h"

#include "wx/arrimpl.cpp"
WX_DEFINE_OBJARRAY(wxHtmlBookRecArray)
WX_DEFINE_OBJARRAY(wxHtmlHelpDataItems)

//-----------------------------------------------------------------------------
// static helper functions
//-----------------------------------------------------------------------------

// Reads one line, stores it into buf and returns pointer to new line or NULL.
static const wxChar* ReadLine(const wxChar *line, wxChar *buf, size_t bufsize)
{
    wxChar *writeptr = buf;
    wxChar *endptr = buf + bufsize - 1;
    const wxChar *readptr = line;

    while (*readptr != 0 && *readptr != _T('\r') && *readptr != _T('\n') &&
           writeptr != endptr)
        *(writeptr++) = *(readptr++);
    *writeptr = 0;
    while (*readptr == _T('\r') || *readptr == _T('\n'))
        readptr++;
    if (*readptr == 0)
        return NULL;
    else
        return readptr;
}



static int
wxHtmlHelpIndexCompareFunc(wxHtmlHelpDataItem **a, wxHtmlHelpDataItem **b)
{
    wxHtmlHelpDataItem *ia = *a;
    wxHtmlHelpDataItem *ib = *b;

    if (ia == NULL)
        return -1;
    if (ib == NULL)
        return 1;

    if (ia->parent == ib->parent)
    {
        return ia->name.CmpNoCase(ib->name);
    }
    else if (ia->level == ib->level)
    {
        return wxHtmlHelpIndexCompareFunc(&ia->parent, &ib->parent);
    }
    else
    {
        wxHtmlHelpDataItem *ia2 = ia;
        wxHtmlHelpDataItem *ib2 = ib;

        while (ia2->level > ib2->level)
        {
            ia2 = ia2->parent;
        }
        while (ib2->level > ia2->level)
        {
            ib2 = ib2->parent;
        }

        wxASSERT(ia2);
        wxASSERT(ib2);
        int res = wxHtmlHelpIndexCompareFunc(&ia2, &ib2);
        if (res != 0)
            return res;
        else if (ia->level > ib->level)
            return 1;
        else
            return -1;
    }
}

//-----------------------------------------------------------------------------
// HP_Parser
//-----------------------------------------------------------------------------

class HP_Parser : public wxHtmlParser
{
public:
    HP_Parser()
    {
        GetEntitiesParser()->SetEncoding(wxFONTENCODING_ISO8859_1);
    }

    wxObject* GetProduct() { return NULL; }

protected:
    virtual void AddText(const wxChar* WXUNUSED(txt)) {}

    DECLARE_NO_COPY_CLASS(HP_Parser)
};


//-----------------------------------------------------------------------------
// HP_TagHandler
//-----------------------------------------------------------------------------

class HP_TagHandler : public wxHtmlTagHandler
{
    private:
        wxString m_name, m_page;
        int m_level;
        int m_id;
        int m_index;
        int m_count;
        wxHtmlHelpDataItem *m_parentItem;
        wxHtmlBookRecord *m_book;

        wxHtmlHelpDataItems *m_data;

    public:
        HP_TagHandler(wxHtmlBookRecord *b) : wxHtmlTagHandler()
        {
            m_data = NULL;
            m_book = b;
            m_name = m_page = wxEmptyString;
            m_level = 0;
            m_id = wxID_ANY;
            m_count = 0;
            m_parentItem = NULL;
        }
        wxString GetSupportedTags() { return wxT("UL,OBJECT,PARAM"); }
        bool HandleTag(const wxHtmlTag& tag);

        void Reset(wxHtmlHelpDataItems& data)
        {
            m_data = &data;
            m_count = 0;
            m_level = 0;
            m_parentItem = NULL;
        }

    DECLARE_NO_COPY_CLASS(HP_TagHandler)
};


bool HP_TagHandler::HandleTag(const wxHtmlTag& tag)
{
    if (tag.GetName() == wxT("UL"))
    {
        wxHtmlHelpDataItem *oldparent = m_parentItem;
        m_level++;
        m_parentItem = (m_count > 0) ? &(*m_data)[m_data->size()-1] : NULL;
        ParseInner(tag);
        m_level--;
        m_parentItem = oldparent;
        return true;
    }
    else if (tag.GetName() == wxT("OBJECT"))
    {
        m_name = m_page = wxEmptyString;
        ParseInner(tag);

#if 0
         if (!page.IsEmpty())
        /* Valid HHW's file may contain only two object tags:

           <OBJECT type="text/site properties">
               <param name="ImageType" value="Folder">
           </OBJECT>

           or

           <OBJECT type="text/sitemap">
               <param name="Name" value="main page">
               <param name="Local" value="another.htm">
           </OBJECT>

           We're interested in the latter. !page.IsEmpty() is valid
           condition because text/site properties does not contain Local param
        */
#endif
        if (tag.GetParam(wxT("TYPE")) == wxT("text/sitemap"))
        {
            wxHtmlHelpDataItem *item = new wxHtmlHelpDataItem();
            item->parent = m_parentItem;
            item->level = m_level;
            item->id = m_id;
            item->page = m_page;
            item->name = m_name;

            item->book = m_book;
            m_data->Add(item);
            m_count++;
        }

        return true;
    }
    else
    { // "PARAM"
        if (m_name.empty() && tag.GetParam(wxT("NAME")) == wxT("Name"))
            m_name = tag.GetParam(wxT("VALUE"));
        if (tag.GetParam(wxT("NAME")) == wxT("Local"))
            m_page = tag.GetParam(wxT("VALUE"));
        if (tag.GetParam(wxT("NAME")) == wxT("ID"))
            tag.GetParamAsInt(wxT("VALUE"), &m_id);
        return false;
    }
}


//-----------------------------------------------------------------------------
// wxHtmlHelpData
//-----------------------------------------------------------------------------

wxString wxHtmlBookRecord::GetFullPath(const wxString &page) const
{
    if (wxIsAbsolutePath(page))
        return page;
    else
        return m_BasePath + page;
}

wxString wxHtmlHelpDataItem::GetIndentedName() const
{
    wxString s;
    for (int i = 1; i < level; i++)
        s << _T("   ");
    s << name;
    return s;
}


IMPLEMENT_DYNAMIC_CLASS(wxHtmlHelpData, wxObject)

wxHtmlHelpData::wxHtmlHelpData()
{
#if WXWIN_COMPATIBILITY_2_4
    m_cacheContents = NULL;
    m_cacheIndex = NULL;
#endif
}

wxHtmlHelpData::~wxHtmlHelpData()
{
#if WXWIN_COMPATIBILITY_2_4
    CleanCompatibilityData();
#endif
}

bool wxHtmlHelpData::LoadMSProject(wxHtmlBookRecord *book, wxFileSystem& fsys,
                                   const wxString& indexfile,
                                   const wxString& contentsfile)
{
    wxFSFile *f;
    wxHtmlFilterHTML filter;
    wxString buf;
    wxString string;

    HP_Parser parser;
    HP_TagHandler *handler = new HP_TagHandler(book);
    parser.AddTagHandler(handler);

    f = ( contentsfile.IsEmpty() ? (wxFSFile*) NULL : fsys.OpenFile(contentsfile) );
    if (f)
    {
        buf.clear();
        buf = filter.ReadFile(*f);
        delete f;
        handler->Reset(m_contents);
        parser.Parse(buf);
    }
    else
    {
        wxLogError(_("Cannot open contents file: %s"), contentsfile.c_str());
    }

    f = ( indexfile.IsEmpty() ? (wxFSFile*) NULL : fsys.OpenFile(indexfile) );
    if (f)
    {
        buf.clear();
        buf = filter.ReadFile(*f);
        delete f;
        handler->Reset(m_index);
        parser.Parse(buf);
    }
    else if (!indexfile.IsEmpty())
    {
        wxLogError(_("Cannot open index file: %s"), indexfile.c_str());
    }
    return true;
}

inline static void CacheWriteInt32(wxOutputStream *f, wxInt32 value)
{
    wxInt32 x = wxINT32_SWAP_ON_BE(value);
    f->Write(&x, sizeof(x));
}

inline static wxInt32 CacheReadInt32(wxInputStream *f)
{
    wxInt32 x;
    f->Read(&x, sizeof(x));
    return wxINT32_SWAP_ON_BE(x);
}

inline static void CacheWriteString(wxOutputStream *f, const wxString& str)
{
    const wxWX2MBbuf mbstr = str.mb_str(wxConvUTF8);
    size_t len = strlen((const char*)mbstr)+1;
    CacheWriteInt32(f, len);
    f->Write((const char*)mbstr, len);
}

inline static wxString CacheReadString(wxInputStream *f)
{
    size_t len = (size_t)CacheReadInt32(f);
    wxCharBuffer str(len-1);
    f->Read(str.data(), len);
    return wxString(str, wxConvUTF8);
}

#define CURRENT_CACHED_BOOK_VERSION     5

// Additional flags to detect incompatibilities of the runtime environment:
#define CACHED_BOOK_FORMAT_FLAGS \
                     (wxUSE_UNICODE << 0)


bool wxHtmlHelpData::LoadCachedBook(wxHtmlBookRecord *book, wxInputStream *f)
{
    int i, st, newsize;
    wxInt32 version;

    /* load header - version info : */
    version = CacheReadInt32(f);

    if (version != CURRENT_CACHED_BOOK_VERSION)
    {
        // NB: We can just silently return false here and don't worry about
        //     it anymore, because AddBookParam will load the MS project in
        //     absence of (properly versioned) .cached file and automatically
        //     create new .cached file immediately afterward.
        return false;
    }

    if (CacheReadInt32(f) != CACHED_BOOK_FORMAT_FLAGS)
        return false;

    /* load contents : */
    st = m_contents.size();
    newsize = st + CacheReadInt32(f);
    m_contents.Alloc(newsize);
    for (i = st; i < newsize; i++)
    {
        wxHtmlHelpDataItem *item = new wxHtmlHelpDataItem;
        item->level = CacheReadInt32(f);
        item->id = CacheReadInt32(f);
        item->name = CacheReadString(f);
        item->page = CacheReadString(f);
        item->book = book;
        m_contents.Add(item);
    }

    /* load index : */
    st = m_index.size();
    newsize = st + CacheReadInt32(f);
    m_index.Alloc(newsize);
    for (i = st; i < newsize; i++)
    {
        wxHtmlHelpDataItem *item = new wxHtmlHelpDataItem;
        item->name = CacheReadString(f);
        item->page = CacheReadString(f);
        item->level = CacheReadInt32(f);
        item->book = book;
        int parentShift = CacheReadInt32(f);
        if (parentShift != 0)
            item->parent = &m_index[m_index.size() - parentShift];
        m_index.Add(item);
    }
    return true;
}


bool wxHtmlHelpData::SaveCachedBook(wxHtmlBookRecord *book, wxOutputStream *f)
{
    int i;
    wxInt32 cnt;

    /* save header - version info : */
    CacheWriteInt32(f, CURRENT_CACHED_BOOK_VERSION);
    CacheWriteInt32(f, CACHED_BOOK_FORMAT_FLAGS);

    /* save contents : */
    int len = m_contents.size();
    for (cnt = 0, i = 0; i < len; i++)
        if (m_contents[i].book == book && m_contents[i].level > 0)
            cnt++;
    CacheWriteInt32(f, cnt);

    for (i = 0; i < len; i++)
    {
        if (m_contents[i].book != book || m_contents[i].level == 0)
            continue;
        CacheWriteInt32(f, m_contents[i].level);
        CacheWriteInt32(f, m_contents[i].id);
        CacheWriteString(f, m_contents[i].name);
        CacheWriteString(f, m_contents[i].page);
    }

    /* save index : */
    len = m_index.size();
    for (cnt = 0, i = 0; i < len; i++)
        if (m_index[i].book == book && m_index[i].level > 0)
            cnt++;
    CacheWriteInt32(f, cnt);

    for (i = 0; i < len; i++)
    {
        if (m_index[i].book != book || m_index[i].level == 0)
            continue;
        CacheWriteString(f, m_index[i].name);
        CacheWriteString(f, m_index[i].page);
        CacheWriteInt32(f, m_index[i].level);
        // save distance to parent item, if any:
        if (m_index[i].parent == NULL)
        {
            CacheWriteInt32(f, 0);
        }
        else
        {
            int cnt = 0;
            wxHtmlHelpDataItem *parent = m_index[i].parent;
            for (int j = i-1; j >= 0; j--)
            {
                if (m_index[j].book == book && m_index[j].level > 0)
                    cnt++;
                if (&m_index[j] == parent)
                    break;
            }
            wxASSERT(cnt > 0);
            CacheWriteInt32(f, cnt);
        }
    }
    return true;
}


void wxHtmlHelpData::SetTempDir(const wxString& path)
{
    if (path.empty())
        m_tempPath = path;
    else
    {
        if (wxIsAbsolutePath(path)) m_tempPath = path;
        else m_tempPath = wxGetCwd() + _T("/") + path;

        if (m_tempPath[m_tempPath.Length() - 1] != _T('/'))
            m_tempPath << _T('/');
    }
}



static wxString SafeFileName(const wxString& s)
{
    wxString res(s);
    res.Replace(wxT("#"), wxT("_"));
    res.Replace(wxT(":"), wxT("_"));
    res.Replace(wxT("\\"), wxT("_"));
    res.Replace(wxT("/"), wxT("_"));
    return res;
}

bool wxHtmlHelpData::AddBookParam(const wxFSFile& bookfile,
                                  wxFontEncoding encoding,
                                  const wxString& title, const wxString& contfile,
                                  const wxString& indexfile, const wxString& deftopic,
                                  const wxString& path)
{
    wxFileSystem fsys;