ceph/src/boost/libs/spirit/example/x3/rexpr/rexpr_full/rexpr/error_handler.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2015 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 =============================================================================*/
   7 #if !defined(BOOST_SPIRIT_X3_REPR_ERROR_HANDLER_HPP)
   8 #define BOOST_SPIRIT_X3_REPR_ERROR_HANDLER_HPP
   9
  10 #include "rexpr.hpp"
  11
  12 #include <boost/spirit/home/x3/support/ast/position_tagged.hpp>
  13 #include <boost/spirit/home/x3/support/utility/error_reporting.hpp>
  14
  15 #include <map>
  16
  17 namespace rexpr { namespace parser
  18 {
  19     namespace x3 = boost::spirit::x3;
  20
  21     ////////////////////////////////////////////////////////////////////////////
  22     //  Our error handler
  23     ////////////////////////////////////////////////////////////////////////////
  24     // X3 Error Handler Utility
  25     template <typename Iterator>
  26     using error_handler = x3::error_handler<Iterator>;
  27
  28     // tag used to get our error handler from the context
  29     using error_handler_tag = x3::error_handler_tag;
  30
  31     struct error_handler_base
  32     {
  33         error_handler_base();
  34
  35         template <typename Iterator, typename Exception, typename Context>
  36         x3::error_handler_result on_error(
  37             Iterator& first, Iterator const& last
  38           , Exception const& x, Context const& context);
  39
  40         std::map<std::string, std::string> id_map;
  41     };
  42
  43     ////////////////////////////////////////////////////////////////////////////
  44     // Implementation
  45     ////////////////////////////////////////////////////////////////////////////
  46
  47     inline error_handler_base::error_handler_base()
  48     {
  49         id_map["rexpr"] = "RExpression";
  50         id_map["rexpr_value"] = "Value";
  51         id_map["rexpr_key_value"] = "Key value pair";
  52     }
  53
  54     template <typename Iterator, typename Exception, typename Context>
  55     inline x3::error_handler_result
  56     error_handler_base::on_error(
  57         Iterator& first, Iterator const& last
  58       , Exception const& x, Context const& context)
  59     {
  60         std::string which = x.which();
  61         auto iter = id_map.find(which);
  62         if (iter != id_map.end())
  63             which = iter->second;
  64
  65         std::string message = "Error! Expecting: " + which + " here:";
  66         auto& error_handler = x3::get<error_handler_tag>(context).get();
  67         error_handler(x.where(), message);
  68         return x3::error_handler_result::fail;
  69     }
  70 }}
  71
  72 #endif