AxisAsProperty.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/Accumulators/StaticHistogram.h>
 
#include <Gaudi/Parsers/Factory.h>
#include <GaudiKernel/ToStream.h>
 
#if ( BOOST_VERSION >= 187000 ) && ( BOOST_VERSION < 188000 )
#  define BOOST_ALLOW_DEPRECATED_HEADERS
#endif
#include <boost/spirit/include/qi.hpp>
#undef BOOST_ALLOW_DEPRECATED_HEADERS
 
namespace Gaudi {
  namespace Parsers {
 
    namespace qi = boost::spirit::qi;
 
    template <typename Iterator, typename Skipper, typename Arithmetic>
    struct AxisGrammar : qi::grammar<Iterator, Gaudi::Accumulators::Axis<Arithmetic>(), qi::locals<char>, Skipper> {
      using Axis = Gaudi::Accumulators::Axis<Arithmetic>;
      struct StoreNbinsOp {
        void operator()( Axis& res, unsigned int const& nBins ) const { res.setNumBins( nBins ); }
      };
      struct StoreMinValueOp {
        void operator()( Axis& res, Arithmetic const& minValue ) const { res.setMinValue( minValue ); }
      };
      struct StoreMaxValueOp {
        void operator()( Axis& res, Arithmetic const& maxValue ) const { res.setMaxValue( maxValue ); }
      };
      struct StoreTitleOp {
        void operator()( Axis& res, std::string const& title ) const { res.setTitle( title ); }
      };
      AxisGrammar() : AxisGrammar::base_type( axis ) {
        begin = enc::char_( '[' )[qi::_val = ']'] | enc::char_( '(' )[qi::_val = ')'];
        end   = enc::char_( qi::_r1 );
        core  = qi::int_[storeNbins( qi::_val, qi::_1 )] >> "," >> qi::double_[storeMinValue( qi::_val, qi::_1 )] >>
               "," >> qi::double_[storeMaxValue( qi::_val, qi::_1 )] >>
               -( "," >> title[storeTitle( qi::_val, qi::_1 )] );
        axis = begin[qi::_a = qi::_1] >> core[qi::_val = qi::_1] >> end( qi::_a );
      }
      qi::rule<Iterator, Axis(), qi::locals<char>, Skipper> axis;
      qi::rule<Iterator, Axis(), Skipper>                   core;
      qi::rule<Iterator, char()>                            begin;
      qi::rule<Iterator, void( char )>                      end;
      StringGrammar<Iterator, Skipper>                      title;
      ph::function<StoreNbinsOp>                            storeNbins;
      ph::function<StoreMinValueOp>                         storeMinValue;
      ph::function<StoreMaxValueOp>                         storeMaxValue;
      ph::function<StoreTitleOp>                            storeTitle;
    };
 
    template <typename Iterator, typename Skipper, typename Arithmetic>
    struct Grammar_<Iterator, Gaudi::Accumulators::Axis<Arithmetic>, Skipper> {
      using Grammar = AxisGrammar<Iterator, Skipper, Arithmetic>;
    };
 
    // Parse function... nothing special, but it must be done explicitely.
    template <typename Arithmetic>
    StatusCode parse( Gaudi::Accumulators::Axis<Arithmetic>& result, const std::string& input ) {
      return parse_( result, input );
    }
 
  } // namespace Parsers
 
} // namespace Gaudi