strings_tfield.cpp

//##################################################################################################
//  ALib C++ Library
//
//  Copyright 2013-2025 A-Worx GmbH, Germany
//  Published under 'Boost Software License' (a free software license, see LICENSE.txt)
//##################################################################################################
#include "alib_precompile.hpp"
#if !defined(ALIB_C20_MODULES) || ((ALIB_C20_MODULES != 0) && (ALIB_C20_MODULES != 1))
#   error "Symbol ALIB_C20_MODULES has to be given to the compiler as either 0 or 1"
#endif
#if ALIB_C20_MODULES
    module;
#endif
//========================================= Global Fragment ========================================
#include "alib/boxing/boxing.prepro.hpp"
 
 
//============================================== Module ============================================
#if ALIB_C20_MODULES
    module ALib.Boxing;
    import   ALib.Lang;
#  if ALIB_STRINGS
    import   ALib.Strings;
#  endif
#else
#   include "ALib.Lang.H"
#   include "ALib.Strings.H"
#   include "ALib.Boxing.H"
#endif
//========================================== Implementation ========================================
 
//##################################################################################################
// TField()
//##################################################################################################
namespace alib::strings {
 
template<typename TChar, typename TAllocator>
void AppendableTraits< TField<TChar>, TChar,TAllocator>::operator()( TAString<TChar,TAllocator>& target,
                                                                     const TField<TChar>& field) {
    TString<TChar> theContent;
 
    // buffer used for conversion (if none string)
    TLocalString<TChar, 256> noneStringArgBuf;
    noneStringArgBuf.DbgDisableBufferReplacementWarning();
 
    // string-type box given?
    if( !field.theContent.template IsType<void>() && field.theContent.template IsType<TString<TChar>>() )
        theContent= field.theContent.template Unbox<TString<TChar>>();
    else {
        // write box into local buffer
        noneStringArgBuf << field.theContent;
        theContent= noneStringArgBuf;
    }
 
    integer padSize=  field.fieldWidth
                    - theContent.WStringLength();
 
    // check pad field.width
    if (padSize <= 0 || field.alignment == lang::Alignment::Left ) {
        target.template _          <NC>( theContent );
        if (padSize > 0 )       target.template InsertChars<NC>( field.padChar, padSize );
        return;
    }
 
    // align Right
    if ( field.alignment == lang::Alignment::Right ) {
        if( padSize > 0 )
            target.template InsertChars<NC>( field.padChar, padSize );
        target.template Append<NC>( theContent );
        return;
    }
 
    // align Center
    integer leftPadding= padSize / 2;
    if( leftPadding > 0 )
        target.template InsertChars<NC> ( field.padChar, leftPadding  );
    target.template Append<NC> ( theContent );
    if( padSize > leftPadding ) target.template InsertChars<NC> ( field.padChar, padSize - leftPadding );
}
 
template void AppendableTraits<TField <nchar>, nchar, lang::HeapAllocator>::operator()( TAString<nchar, lang::HeapAllocator>&, const TField <nchar>& );
template void AppendableTraits<TField <wchar>, wchar, lang::HeapAllocator>::operator()( TAString<wchar, lang::HeapAllocator>&, const TField <wchar>& );
}