HTMLELEM.CXX

//+--------------------------------------------------------------------------- 
// 
//  Copyright 1992 - 1998 Microsoft Corporation. 
// 
//  File:       htmlelem.cxx 
// 
//  Contents:   Base class for Html element 
// 
//  Classes:    CHtmlElement 
// 
//---------------------------------------------------------------------------- 
 
#include <pch.cxx> 
#pragma hdrstop 
 
#include <htmlelem.hxx> 
 
 
//+------------------------------------------------------------------------- 
// 
//  Method:     CHtmlElement::CHtmlElement 
// 
//  Synopsis:   Constructor 
// 
//  Arguments:  [htmlIFilter]     -- Reference to IFilter 
//              [mmSerialStream]  -- Reference to input stream 
// 
//-------------------------------------------------------------------------- 
 
CHtmlElement::CHtmlElement( CHtmlIFilter& htmlIFilter, 
                            CSerialStream& serialStream ) 
    : _htmlIFilter(htmlIFilter), 
      _serialStream(serialStream), 
      _scanner(htmlIFilter, serialStream) 
{ 
} 
 
 
//+------------------------------------------------------------------------- 
// 
//  Method:     CHtmlElement::GetValue 
// 
//  Synopsis:   Default implementation for returning value in current chunk 
// 
//  Arguments:  [ppPropValue]  -- Value returned here 
// 
//-------------------------------------------------------------------------- 
SCODE CHtmlElement::GetValue( VARIANT ** ppPropValue ) 
{ 
    return FILTER_E_NO_VALUES; 
} 
 
//+------------------------------------------------------------------------- 
// 
//  Method:     CHtmlElement::InitFilterRegion 
// 
//  Synopsis:   Initializes the filter region of a chunk to default value 
// 
//  Arguments:  [idChunkSource]  -- Id of source chunk 
//              [cwcStartSource] -- Offset of source text in chunk 
//              [cwcLenSource]   -- Length of source text in chunk 
// 
//-------------------------------------------------------------------------- 
 
void CHtmlElement::InitFilterRegion( ULONG& idChunkSource, 
                                     ULONG& cwcStartSource, 
                                     ULONG& cwcLenSource ) 
{ 
    idChunkSource = 0; 
    cwcStartSource = 0; 
    cwcLenSource = 0; 
} 
 
 
 
//+------------------------------------------------------------------------- 
// 
//  Method:     CHtmlElement::SwitchToNextHtmlElement 
// 
//  Synopsis:   Find the next Html element and switch to it's parsing algorithm 
// 
//  Arguments:  [pStat] -- chunk information returned here 
// 
//-------------------------------------------------------------------------- 
 
SCODE CHtmlElement::SwitchToNextHtmlElement( STAT_CHUNK *pStat ) 
{ 
    CToken token; 
 
    _scanner.SkipCharsUntilNextRelevantToken( token ); 
    HtmlTokenType eTokType = token.GetTokenType(); 
    if ( eTokType == EofToken ) 
        return FILTER_E_END_OF_CHUNKS; 
 
    CHtmlElement *pHtmlElemNext = _htmlIFilter.QueryHtmlElement( eTokType ); 
    Win4Assert( pHtmlElemNext ); 
    pHtmlElemNext->InitStatChunk( pStat ); 
    _htmlIFilter.ChangeState( pHtmlElemNext ); 
 
    return S_OK; 
} 
 
 
 
//+------------------------------------------------------------------------- 
// 
//  Method:     CHtmlElement::SkipRemainingTextAndGotoNextChunk 
// 
//  Synopsis:   Move to the next chunk 
// 
//  Arguments:  [pStat] -- chunk information returned here 
// 
//-------------------------------------------------------------------------- 
 
SCODE CHtmlElement::SkipRemainingTextAndGotoNextChunk( STAT_CHUNK *pStat ) 
{ 
    ULONG ulBufSize  = TEMP_BUFFER_SIZE; 
 
    // 
    // Loop until text in current chunk has been exhausted 
    // 
    SCODE sc = GetText( &ulBufSize, _aTempBuffer ); 
    while ( SUCCEEDED(sc) ) 
    { 
        sc = GetText( &ulBufSize, _aTempBuffer ); 
    } 
 
    sc = GetChunk( pStat ); 
 
    return sc; 
}