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284 lines
10 KiB
C++
284 lines
10 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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/// \file debug.hpp
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/// Utilities for debugging Proto expression trees
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROTO_DEBUG_HPP_EAN_12_31_2006
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#define BOOST_PROTO_DEBUG_HPP_EAN_12_31_2006
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#include <iostream>
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#include <boost/preprocessor/stringize.hpp>
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#include <boost/core/ref.hpp>
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#include <boost/core/typeinfo.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/proto/proto_fwd.hpp>
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#include <boost/proto/traits.hpp>
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#include <boost/proto/matches.hpp>
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#include <boost/proto/fusion.hpp>
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#include <boost/fusion/algorithm/iteration/for_each.hpp>
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namespace boost { namespace proto
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{
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namespace tagns_ { namespace tag
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{
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#define BOOST_PROTO_DEFINE_TAG_INSERTION(Tag) \
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/** \brief INTERNAL ONLY */ \
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inline std::ostream &operator <<(std::ostream &sout, Tag const &) \
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{ \
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return sout << BOOST_PP_STRINGIZE(Tag); \
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} \
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/**/
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BOOST_PROTO_DEFINE_TAG_INSERTION(terminal)
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BOOST_PROTO_DEFINE_TAG_INSERTION(unary_plus)
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BOOST_PROTO_DEFINE_TAG_INSERTION(negate)
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BOOST_PROTO_DEFINE_TAG_INSERTION(dereference)
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BOOST_PROTO_DEFINE_TAG_INSERTION(complement)
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BOOST_PROTO_DEFINE_TAG_INSERTION(address_of)
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BOOST_PROTO_DEFINE_TAG_INSERTION(logical_not)
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BOOST_PROTO_DEFINE_TAG_INSERTION(pre_inc)
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BOOST_PROTO_DEFINE_TAG_INSERTION(pre_dec)
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BOOST_PROTO_DEFINE_TAG_INSERTION(post_inc)
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BOOST_PROTO_DEFINE_TAG_INSERTION(post_dec)
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BOOST_PROTO_DEFINE_TAG_INSERTION(shift_left)
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BOOST_PROTO_DEFINE_TAG_INSERTION(shift_right)
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BOOST_PROTO_DEFINE_TAG_INSERTION(multiplies)
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BOOST_PROTO_DEFINE_TAG_INSERTION(divides)
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BOOST_PROTO_DEFINE_TAG_INSERTION(modulus)
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BOOST_PROTO_DEFINE_TAG_INSERTION(plus)
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BOOST_PROTO_DEFINE_TAG_INSERTION(minus)
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BOOST_PROTO_DEFINE_TAG_INSERTION(less)
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BOOST_PROTO_DEFINE_TAG_INSERTION(greater)
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BOOST_PROTO_DEFINE_TAG_INSERTION(less_equal)
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BOOST_PROTO_DEFINE_TAG_INSERTION(greater_equal)
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BOOST_PROTO_DEFINE_TAG_INSERTION(equal_to)
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BOOST_PROTO_DEFINE_TAG_INSERTION(not_equal_to)
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BOOST_PROTO_DEFINE_TAG_INSERTION(logical_or)
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BOOST_PROTO_DEFINE_TAG_INSERTION(logical_and)
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BOOST_PROTO_DEFINE_TAG_INSERTION(bitwise_and)
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BOOST_PROTO_DEFINE_TAG_INSERTION(bitwise_or)
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BOOST_PROTO_DEFINE_TAG_INSERTION(bitwise_xor)
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BOOST_PROTO_DEFINE_TAG_INSERTION(comma)
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BOOST_PROTO_DEFINE_TAG_INSERTION(mem_ptr)
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BOOST_PROTO_DEFINE_TAG_INSERTION(assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(shift_left_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(shift_right_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(multiplies_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(divides_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(modulus_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(plus_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(minus_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(bitwise_and_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(bitwise_or_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(bitwise_xor_assign)
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BOOST_PROTO_DEFINE_TAG_INSERTION(subscript)
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BOOST_PROTO_DEFINE_TAG_INSERTION(member)
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BOOST_PROTO_DEFINE_TAG_INSERTION(if_else_)
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BOOST_PROTO_DEFINE_TAG_INSERTION(function)
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#undef BOOST_PROTO_DEFINE_TAG_INSERTION
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}}
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namespace hidden_detail_
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{
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struct ostream_wrapper
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{
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ostream_wrapper(std::ostream &sout)
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: sout_(sout)
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{}
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std::ostream &sout_;
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BOOST_DELETED_FUNCTION(ostream_wrapper &operator =(ostream_wrapper const &))
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};
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struct named_any
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{
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template<typename T>
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named_any(T const &)
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: name_(BOOST_CORE_TYPEID(T).name())
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{}
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char const *name_;
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};
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inline std::ostream &operator <<(ostream_wrapper sout_wrap, named_any t)
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{
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return sout_wrap.sout_ << t.name_;
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}
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}
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namespace detail
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{
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// copyable functor to pass by value to fusion::foreach
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struct display_expr_impl;
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struct display_expr_impl_functor
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{
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display_expr_impl_functor(display_expr_impl const& impl): impl_(impl)
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{}
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template<typename Expr>
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void operator()(Expr const &expr) const
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{
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this->impl_(expr);
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}
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private:
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display_expr_impl const& impl_;
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};
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struct display_expr_impl
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{
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explicit display_expr_impl(std::ostream &sout, int depth = 0)
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: depth_(depth)
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, first_(true)
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, sout_(sout)
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{}
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template<typename Expr>
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void operator()(Expr const &expr) const
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{
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this->impl(expr, mpl::long_<arity_of<Expr>::value>());
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}
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BOOST_DELETED_FUNCTION(display_expr_impl(display_expr_impl const &))
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BOOST_DELETED_FUNCTION(display_expr_impl &operator =(display_expr_impl const &))
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private:
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template<typename Expr>
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void impl(Expr const &expr, mpl::long_<0>) const
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{
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using namespace hidden_detail_;
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typedef typename tag_of<Expr>::type tag;
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this->sout_.width(this->depth_);
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this->sout_ << (this->first_? "" : ", ");
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this->sout_ << tag() << "(" << proto::value(expr) << ")\n";
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this->first_ = false;
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}
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template<typename Expr, typename Arity>
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void impl(Expr const &expr, Arity) const
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{
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using namespace hidden_detail_;
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typedef typename tag_of<Expr>::type tag;
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this->sout_.width(this->depth_);
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this->sout_ << (this->first_? "" : ", ");
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this->sout_ << tag() << "(\n";
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display_expr_impl display(this->sout_, this->depth_ + 4);
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fusion::for_each(expr, display_expr_impl_functor(display));
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this->sout_.width(this->depth_);
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this->sout_ << "" << ")\n";
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this->first_ = false;
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}
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int depth_;
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mutable bool first_;
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std::ostream &sout_;
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};
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}
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namespace functional
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{
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/// \brief Pretty-print a Proto expression tree.
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///
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/// A PolymorphicFunctionObject which accepts a Proto expression
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/// tree and pretty-prints it to an \c ostream for debugging
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/// purposes.
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struct display_expr
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{
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BOOST_PROTO_CALLABLE()
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typedef void result_type;
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/// \param sout The \c ostream to which the expression tree
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/// will be written.
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/// \param depth The starting indentation depth for this node.
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/// Children nodes will be displayed at a starting
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/// depth of <tt>depth+4</tt>.
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explicit display_expr(std::ostream &sout = std::cout, int depth = 0)
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: depth_(depth)
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, sout_(sout)
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{}
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/// \brief Pretty-print the current node in a Proto expression
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/// tree.
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template<typename Expr>
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void operator()(Expr const &expr) const
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{
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detail::display_expr_impl(this->sout_, this->depth_)(expr);
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}
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private:
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int depth_;
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reference_wrapper<std::ostream> sout_;
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};
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}
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/// \brief Pretty-print a Proto expression tree.
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///
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/// \note Equivalent to <tt>functional::display_expr(0, sout)(expr)</tt>
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/// \param expr The Proto expression tree to pretty-print
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/// \param sout The \c ostream to which the output should be
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/// written. If not specified, defaults to
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/// <tt>std::cout</tt>.
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template<typename Expr>
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void display_expr(Expr const &expr, std::ostream &sout)
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{
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functional::display_expr(sout, 0)(expr);
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}
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/// \overload
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///
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template<typename Expr>
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void display_expr(Expr const &expr)
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{
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functional::display_expr()(expr);
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}
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/// \brief Assert at compile time that a particular expression
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/// matches the specified grammar.
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///
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/// \note Equivalent to <tt>BOOST_MPL_ASSERT((proto::matches\<Expr, Grammar\>))</tt>
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/// \param expr The Proto expression to check againts <tt>Grammar</tt>
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template<typename Grammar, typename Expr>
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void assert_matches(Expr const & /*expr*/)
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{
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BOOST_MPL_ASSERT((proto::matches<Expr, Grammar>));
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}
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/// \brief Assert at compile time that a particular expression
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/// does not match the specified grammar.
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///
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/// \note Equivalent to <tt>BOOST_MPL_ASSERT_NOT((proto::matches\<Expr, Grammar\>))</tt>
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/// \param expr The Proto expression to check againts <tt>Grammar</tt>
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template<typename Grammar, typename Expr>
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void assert_matches_not(Expr const & /*expr*/)
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{
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BOOST_MPL_ASSERT_NOT((proto::matches<Expr, Grammar>));
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}
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/// \brief Assert at compile time that a particular expression
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/// matches the specified grammar.
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///
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/// \note Equivalent to <tt>proto::assert_matches\<Grammar\>(Expr)</tt>
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/// \param Expr The Proto expression to check againts <tt>Grammar</tt>
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/// \param Grammar The grammar used to validate Expr.
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#define BOOST_PROTO_ASSERT_MATCHES(Expr, Grammar) \
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(true ? (void)0 : boost::proto::assert_matches<Grammar>(Expr))
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/// \brief Assert at compile time that a particular expression
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/// does not match the specified grammar.
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///
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/// \note Equivalent to <tt>proto::assert_matches_not\<Grammar\>(Expr)</tt>
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/// \param Expr The Proto expression to check againts <tt>Grammar</tt>
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/// \param Grammar The grammar used to validate Expr.
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#define BOOST_PROTO_ASSERT_MATCHES_NOT(Expr, Grammar) \
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(true ? (void)0 : boost::proto::assert_matches_not<Grammar>(Expr))
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}}
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#endif
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