Factory.h

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* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
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* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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#pragma once
 
#include <Gaudi/Parsers/Grammars.h>
#include <GaudiKernel/StatusCode.h>
#include <string>
#include <string_view>
 
namespace Gaudi::Parsers {
  typedef std::string_view::const_iterator IteratorT;
  typedef SkipperGrammar<IteratorT>        Skipper;
  template <typename ResultT>
  inline StatusCode parse_( ResultT& result, std::string_view input ) {
    Skipper                                                 skipper;
    typename Grammar_<IteratorT, ResultT, Skipper>::Grammar g;
    IteratorT                                               iter = input.begin(), end = input.end();
    return ( qi::phrase_parse( iter, end, g, skipper, result ) && ( iter == end ) ? StatusCode::SUCCESS
                                                                                  : StatusCode::FAILURE );
  }
  template <>
  inline StatusCode parse_( std::string& result, std::string_view input ) {
    Skipper                                            skipper;
    Grammar_<IteratorT, std::string, Skipper>::Grammar g;
    IteratorT                                          iter = input.begin(), end = input.end();
    if ( !( qi::phrase_parse( iter, end, g, skipper, result ) && ( iter == end ) ) ) { result = input; }
    //@attention always
    return StatusCode::SUCCESS;
  }
  template <typename ResultT>
  inline StatusCode parse( ResultT& result, std::string_view input ) {
    return parse_( result, input );
  }
} // namespace Gaudi::Parsers