// Copyright (c) 2001-2011 Hartmut Kaiser
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// Copyright (c) 2001-2011 Joel de Guzman
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//
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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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#if !defined(BOOST_SPIRIT_KARMA_DEBUG_HANDLER_APR_21_2010_0148PM)
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#define BOOST_SPIRIT_KARMA_DEBUG_HANDLER_APR_21_2010_0148PM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/spirit/home/karma/nonterminal/rule.hpp>
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#include <boost/spirit/home/karma/nonterminal/debug_handler_state.hpp>
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#include <boost/function.hpp>
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#include <boost/fusion/include/at.hpp>
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#include <boost/fusion/include/vector.hpp>
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#include <boost/fusion/include/out.hpp>
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#include <iostream>
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namespace boost { namespace spirit { namespace karma
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{
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template <
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typename OutputIterator, typename Context, typename Delimiter
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, typename Properties, typename F>
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struct debug_handler
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{
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typedef detail::output_iterator<OutputIterator, Properties>
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output_iterator;
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typedef detail::enable_buffering<output_iterator> buffer_type;
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typedef function<bool(output_iterator&, Context&, Delimiter const&)>
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function_type;
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debug_handler(function_type subject, F f, std::string const& rule_name)
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: subject(subject)
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, f(f)
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, rule_name(rule_name)
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{}
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bool operator()(output_iterator& sink, Context& context
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, Delimiter const& delim) const
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{
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buffer_type buffer(sink);
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bool r = false;
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f (sink, context, pre_generate, rule_name, buffer);
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{
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detail::disable_counting<output_iterator> nocount(sink);
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r = subject(sink, context, delim);
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}
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if (r)
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{
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f (sink, context, successful_generate, rule_name, buffer);
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buffer.buffer_copy();
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return true;
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}
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f (sink, context, failed_generate, rule_name, buffer);
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return false;
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}
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function_type subject;
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F f;
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std::string rule_name;
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};
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template <typename OutputIterator
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, typename T1, typename T2, typename T3, typename T4, typename F>
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void debug(rule<OutputIterator, T1, T2, T3, T4>& r, F f)
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{
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typedef rule<OutputIterator, T1, T2, T3, T4> rule_type;
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typedef
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debug_handler<
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OutputIterator
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, typename rule_type::context_type
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, typename rule_type::delimiter_type
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, typename rule_type::properties
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, F>
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debug_handler;
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r.f = debug_handler(r.f, f, r.name());
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}
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struct simple_trace;
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namespace detail
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{
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// This class provides an extra level of indirection through a
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// template to produce the simple_trace type. This way, the use
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// of simple_trace below is hidden behind a dependent type, so
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// that compilers eagerly type-checking template definitions
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// won't complain that simple_trace is incomplete.
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template<typename T>
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struct get_simple_trace
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{
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typedef simple_trace type;
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};
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}
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template <typename OutputIterator
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, typename T1, typename T2, typename T3, typename T4>
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void debug(rule<OutputIterator, T1, T2, T3, T4>& r)
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{
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typedef rule<OutputIterator, T1, T2, T3, T4> rule_type;
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typedef
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debug_handler<
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OutputIterator
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, typename rule_type::context_type
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, typename rule_type::delimiter_type
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, typename rule_type::properties
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, simple_trace>
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debug_handler;
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typedef typename karma::detail::get_simple_trace<OutputIterator>::type
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trace;
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r.f = debug_handler(r.f, trace(), r.name());
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}
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}}}
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///////////////////////////////////////////////////////////////////////////////
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// Utility macro for easy enabling of rule and grammar debugging
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#if !defined(BOOST_SPIRIT_DEBUG_NODE)
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#if defined(BOOST_SPIRIT_KARMA_DEBUG)
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#define BOOST_SPIRIT_DEBUG_NODE(r) r.name(#r); debug(r)
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#else
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#define BOOST_SPIRIT_DEBUG_NODE(r) r.name(#r);
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#endif
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#endif
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#endif
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