106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
#ifndef BOOST_METAPARSE_V1_DEBUG_PARSING_ERROR_HPP
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#define BOOST_METAPARSE_V1_DEBUG_PARSING_ERROR_HPP
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// Copyright Abel Sinkovics (abel@sinkovics.hu) 2011.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/metaparse/v1/fwd/build_parser.hpp>
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#include <boost/metaparse/v1/start.hpp>
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#include <boost/metaparse/v1/is_error.hpp>
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#include <boost/metaparse/v1/get_remaining.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/string.hpp>
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#include <iostream>
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#include <cstdlib>
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namespace boost
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{
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namespace metaparse
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{
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namespace v1
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{
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template <class P, class S>
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class debug_parsing_error
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{
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public:
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debug_parsing_error()
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{
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using std::cout;
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using std::endl;
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using boost::mpl::c_str;
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typedef display<typename P::template apply<S, start>::type> runner;
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cout << "Compile-time parsing results" << endl;
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cout << "----------------------------" << endl;
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cout << "Input text:" << endl;
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cout << c_str<S>::type::value << endl;
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cout << endl;
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runner::run();
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std::exit(0);
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}
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typedef debug_parsing_error type;
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private:
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template <class Result>
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struct display_error
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{
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static void run()
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{
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typedef typename Result::type R;
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std::cout
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<< "Parsing failed:" << std::endl
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<< "line " << get_line<typename R::source_position>::type::value
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<< ", col " << get_col<typename R::source_position>::type::value
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<< ": "
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<< R::message::type::get_value() << std::endl;
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}
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};
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template <class Result>
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struct display_no_error
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{
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static void run()
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{
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using std::cout;
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using std::endl;
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using boost::mpl::c_str;
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typedef typename get_remaining<Result>::type remaining_string;
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cout
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<< "Parsing was successful. Remaining string is:" << endl
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<< c_str<remaining_string>::type::value << endl;
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}
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};
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template <class Result>
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struct display :
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boost::mpl::if_<
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typename is_error<Result>::type,
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display_error<Result>,
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display_no_error<Result>
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>::type
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{};
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};
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// Special case to handle when DebugParsingError is used with build_parser
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// (it shouldn't be)
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template <class P, class S>
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class debug_parsing_error<build_parser<P>, S> :
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debug_parsing_error<P, S>
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{};
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}
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}
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}
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#endif
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