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