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- /*=============================================================================
- Copyright (c) 2001-2014 Joel de Guzman
- Copyright (c) 2001-2011 Hartmut Kaiser
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- ==============================================================================*/
- #if !defined(BOOST_SPIRIT_X3_SIMPLE_TRACE_DECEMBER_06_2008_1102AM)
- #define BOOST_SPIRIT_X3_SIMPLE_TRACE_DECEMBER_06_2008_1102AM
- #include <boost/spirit/home/x3/support/unused.hpp>
- #include <boost/spirit/home/x3/support/traits/print_token.hpp>
- #include <boost/spirit/home/x3/support/traits/print_attribute.hpp>
- #include <boost/spirit/home/x3/nonterminal/debug_handler_state.hpp>
- #include <boost/type_traits/is_same.hpp>
- #include <iostream>
- // The stream to use for debug output
- #if !defined(BOOST_SPIRIT_X3_DEBUG_OUT)
- #define BOOST_SPIRIT_X3_DEBUG_OUT std::cerr
- #endif
- // number of tokens to print while debugging
- #if !defined(BOOST_SPIRIT_X3_DEBUG_PRINT_SOME)
- #define BOOST_SPIRIT_X3_DEBUG_PRINT_SOME 20
- #endif
- // number of spaces to indent
- #if !defined(BOOST_SPIRIT_X3_DEBUG_INDENT)
- #define BOOST_SPIRIT_X3_DEBUG_INDENT 2
- #endif
- namespace boost { namespace spirit { namespace x3
- {
- namespace detail
- {
- template <typename Char>
- inline void token_printer(std::ostream& o, Char c)
- {
- // allow customization of the token printer routine
- x3::traits::print_token(o, c);
- }
- }
- template <int IndentSpaces = 2, int CharsToPrint = 20>
- struct simple_trace
- {
- simple_trace(std::ostream& out)
- : out(out), indent(0) {}
- void print_indent(int n) const
- {
- n *= IndentSpaces;
- for (int i = 0; i != n; ++i)
- out << ' ';
- }
- template <typename Iterator>
- void print_some(
- char const* tag
- , Iterator first, Iterator const& last) const
- {
- print_indent(indent);
- out << '<' << tag << '>';
- int const n = CharsToPrint;
- for (int i = 0; first != last && i != n && *first; ++i, ++first)
- detail::token_printer(out, *first);
- out << "</" << tag << '>' << std::endl;
- // $$$ FIXME convert invalid xml characters (e.g. '<') to valid
- // character entities. $$$
- }
- template <typename Iterator, typename Attribute, typename State>
- void operator()(
- Iterator const& first
- , Iterator const& last
- , Attribute const& attr
- , State state
- , std::string const& rule_name) const
- {
- switch (state)
- {
- case pre_parse:
- print_indent(indent++);
- out
- << '<' << rule_name << '>'
- << std::endl;
- print_some("try", first, last);
- break;
- case successful_parse:
- print_some("success", first, last);
- if (!is_same<Attribute, unused_type>::value)
- {
- print_indent(indent);
- out
- << "<attributes>";
- traits::print_attribute(out, attr);
- out
- << "</attributes>";
- out << std::endl;
- }
- print_indent(--indent);
- out
- << "</" << rule_name << '>'
- << std::endl;
- break;
- case failed_parse:
- print_indent(indent);
- out << "<fail/>" << std::endl;
- print_indent(--indent);
- out
- << "</" << rule_name << '>'
- << std::endl;
- break;
- }
- }
- std::ostream& out;
- mutable int indent;
- };
- namespace detail
- {
- typedef simple_trace<
- BOOST_SPIRIT_X3_DEBUG_INDENT, BOOST_SPIRIT_X3_DEBUG_PRINT_SOME>
- simple_trace_type;
- inline simple_trace_type&
- get_simple_trace()
- {
- static simple_trace_type tracer(BOOST_SPIRIT_X3_DEBUG_OUT);
- return tracer;
- }
- }
- }}}
- #endif
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