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 error_handler_base()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 on_error(Iterator & first,Iterator const & last,Exception const & x,Context const & context)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 73