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343 lines (268 loc) · 11.4 KB
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/******************************************************************************\
* ___ __ *
* /\_ \ __/\ \ *
* \//\ \ /\_\ \ \____ ___ _____ _____ __ *
* \ \ \ \/\ \ \ '__`\ /'___\/\ '__`\/\ '__`\ /'__`\ *
* \_\ \_\ \ \ \ \L\ \/\ \__/\ \ \L\ \ \ \L\ \/\ \L\.\_ *
* /\____\\ \_\ \_,__/\ \____\\ \ ,__/\ \ ,__/\ \__/.\_\ *
* \/____/ \/_/\/___/ \/____/ \ \ \/ \ \ \/ \/__/\/_/ *
* \ \_\ \ \_\ *
* \/_/ \/_/ *
* *
* Copyright (C) 2011, 2012 *
* Dominik Charousset <dominik.charousset@haw-hamburg.de> *
* *
* This file is part of libcppa. *
* libcppa is free software: you can redistribute it and/or modify it under *
* the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation, either version 3 of the License *
* or (at your option) any later version. *
* *
* libcppa is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with libcppa. If not, see <http://www.gnu.org/licenses/>. *
\******************************************************************************/
#ifndef CPPA_PATTERN_HPP
#define CPPA_PATTERN_HPP
#include <iostream>
#include <list>
#include <memory>
#include <vector>
#include <cstddef>
#include <type_traits>
#include "cppa/option.hpp"
#include "cppa/anything.hpp"
#include "cppa/any_tuple.hpp"
#include "cppa/uniform_type_info.hpp"
#include "cppa/util/guard.hpp"
#include "cppa/util/tbind.hpp"
#include "cppa/util/type_list.hpp"
#include "cppa/util/arg_match_t.hpp"
#include "cppa/util/fixed_vector.hpp"
#include "cppa/util/is_primitive.hpp"
#include "cppa/util/static_foreach.hpp"
#include "cppa/detail/boxed.hpp"
#include "cppa/detail/tdata.hpp"
#include "cppa/detail/types_array.hpp"
namespace cppa {
/**
* @brief Denotes the position of {@link cppa::anything anything} in a
* template parameter pack.
*/
enum class wildcard_position {
nil,
trailing,
leading,
in_between,
multiple
};
/**
* @brief Gets the position of {@link cppa::anything anything} from the
* type list @p Types.
* @tparam A template parameter pack as {@link cppa::util::type_list type_list}.
*/
template<typename Types>
constexpr wildcard_position get_wildcard_position() {
return util::tl_exists<Types, is_anything>::value
? ((util::tl_count<Types, is_anything>::value == 1)
? (std::is_same<typename Types::head, anything>::value
? wildcard_position::leading
: (std::is_same<typename Types::back, anything>::value
? wildcard_position::trailing
: wildcard_position::in_between))
: wildcard_position::multiple)
: wildcard_position::nil;
}
struct value_matcher {
const bool is_dummy;
inline value_matcher(bool dummy_impl = false) : is_dummy(dummy_impl) { }
virtual ~value_matcher();
virtual bool operator()(const any_tuple&) const = 0;
};
struct dummy_matcher : value_matcher {
inline dummy_matcher() : value_matcher(true) { }
bool operator()(const any_tuple&) const;
};
struct cmp_helper {
size_t i;
const any_tuple& tup;
cmp_helper(const any_tuple& tp, size_t pos = 0) : i(pos), tup(tp) { }
template<typename T>
inline bool operator()(const T& what) {
return what == tup.get_as<T>(i++);
}
template<typename T>
inline bool operator()(std::unique_ptr<util::guard<T> const >& g) {
return (*g)(tup.get_as<T>(i++));
}
template<typename T>
inline bool operator()(const util::wrapped<T>&) {
++i;
return true;
}
};
template<wildcard_position WP, class PatternTypes, class ValueTypes>
class value_matcher_impl;
template<typename... Ts, typename... Vs>
class value_matcher_impl<wildcard_position::nil,
util::type_list<Ts...>,
util::type_list<Vs...> > : public value_matcher {
detail::tdata<Vs...> m_values;
public:
template<typename... Args>
value_matcher_impl(Args&&... args) : m_values(std::forward<Args>(args)...) { }
bool operator()(const any_tuple& tup) const {
cmp_helper h{tup};
return util::static_foreach<0, sizeof...(Vs)>::eval(m_values, h);
}
};
template<typename... Ts, typename... Vs>
class value_matcher_impl<wildcard_position::trailing,
util::type_list<Ts...>,
util::type_list<Vs...> >
: public value_matcher_impl<wildcard_position::nil,
util::type_list<Ts...>,
util::type_list<Vs...> > {
typedef value_matcher_impl<wildcard_position::nil,
util::type_list<Ts...>,
util::type_list<Vs...> >
super;
public:
template<typename... Args>
value_matcher_impl(Args&&... args) : super(std::forward<Args>(args)...) { }
};
template<typename... Ts, typename... Vs>
class value_matcher_impl<wildcard_position::leading,
util::type_list<Ts...>,
util::type_list<Vs...> > : public value_matcher {
detail::tdata<Vs...> m_values;
public:
template<typename... Args>
value_matcher_impl(Args&&... args) : m_values(std::forward<Args>(args)...) { }
bool operator()(const any_tuple& tup) const {
cmp_helper h{tup, tup.size() - sizeof...(Ts)};
return util::static_foreach<0, sizeof...(Vs)>::eval(m_values, h);
}
};
template<typename... Ts, typename... Vs>
class value_matcher_impl<wildcard_position::in_between,
util::type_list<Ts...>,
util::type_list<Vs...> > : public value_matcher {
detail::tdata<Vs...> m_values;
public:
template<typename... Args>
value_matcher_impl(Args&&... args) : m_values(std::forward<Args>(args)...) { }
bool operator()(const any_tuple& tup) const {
static constexpr size_t wcpos =
static_cast<size_t>(util::tl_find<util::type_list<Ts...>, anything>::value);
static_assert(wcpos < sizeof...(Ts), "illegal wildcard position");
cmp_helper h0{tup, 0};
cmp_helper h1{tup, tup.size() - (sizeof...(Ts) - (wcpos + 1))};
static constexpr size_t range_end = (sizeof...(Vs) > wcpos)
? wcpos
: sizeof...(Vs);
return util::static_foreach<0, range_end>::eval(m_values, h0)
&& util::static_foreach<range_end + 1, sizeof...(Vs)>::eval(m_values, h1);
}
};
template<typename... Ts, typename... Vs>
class value_matcher_impl<wildcard_position::multiple,
util::type_list<Ts...>,
util::type_list<Vs...> > : public value_matcher {
public:
template<typename... Args>
value_matcher_impl(Args&&...) { }
bool operator()(const any_tuple&) const {
throw std::runtime_error("not implemented yet, sorry");
}
};
/**
* @brief A pattern matching for type and optionally value of tuple elements.
*/
template<typename... Types>
class pattern {
static_assert(sizeof...(Types) > 0, "empty pattern");
pattern(const pattern&) = delete;
pattern& operator=(const pattern&) = delete;
public:
static constexpr size_t size = sizeof...(Types);
static constexpr wildcard_position wildcard_pos =
get_wildcard_position<util::type_list<Types...> >();
/**
* @brief Parameter pack as {@link cppa::util::type_list type_list}.
*/
typedef util::type_list<Types...> types;
typedef typename types::head head_type;
typedef typename util::tl_filter_not<types, is_anything>::type
filtered_types;
static constexpr size_t filtered_size = filtered_types::size;
typedef util::fixed_vector<size_t, filtered_types::size> mapping_vector;
typedef const uniform_type_info* const_iterator;
typedef std::reverse_iterator<const_iterator> reverse_const_iterator;
inline const_iterator begin() const {
return detail::static_types_array<Types...>::arr.begin();
}
inline const_iterator end() const {
return detail::static_types_array<Types...>::arr.end();
}
inline reverse_const_iterator rbegin() const {
return reverse_const_iterator{end()};
}
inline reverse_const_iterator rend() const {
return reverse_const_iterator{begin()};
}
inline bool has_values() const { return m_vm->is_dummy == false; }
// @warning does NOT check types
bool _matches_values(const any_tuple& tup) const {
return (*m_vm)(tup);
}
pattern() : m_vm(new dummy_matcher) {
}
template<typename... Args>
pattern(head_type arg0, Args&&... args)
: m_vm(get_value_matcher(std::move(arg0), std::forward<Args>(args)...)) {
}
template<typename... Args>
pattern(const util::wrapped<head_type>& arg0, Args&&... args)
: m_vm(get_value_matcher(arg0, std::forward<Args>(args)...)) {
}
template<typename... Args>
pattern(const detail::tdata<Args...>& data) {
m_vm.reset(new value_matcher_impl<wildcard_pos, types, util::type_list<Args...> >{data});
}
pattern(std::unique_ptr<value_matcher>&& vm) : m_vm(std::move(vm)) {
if (!m_vm) m_vm.reset(new dummy_matcher);
}
static inline value_matcher* get_value_matcher() {
return nullptr;
}
template<typename Arg0, typename... Args>
static value_matcher* get_value_matcher(Arg0&& arg0, Args&&... args) {
using namespace util;
typedef typename tl_filter_not<
type_list<typename detail::strip_and_convert<Arg0>::type,
typename detail::strip_and_convert<Args>::type...>,
tbind<std::is_same, wrapped<arg_match_t> >::type
>::type
arg_types;
static_assert(arg_types::size <= size, "too many arguments");
if (tl_forall<arg_types, detail::is_boxed>::value) {
return new dummy_matcher;
}
return new value_matcher_impl<wildcard_pos, types, arg_types>{std::forward<Arg0>(arg0), std::forward<Args>(args)...};
}
private:
std::unique_ptr<value_matcher> m_vm;
};
template<typename TypeList>
struct pattern_from_type_list;
template<typename... Types>
struct pattern_from_type_list<util::type_list<Types...>> {
typedef pattern<Types...> type;
};
} // namespace cppa
#endif // CPPA_PATTERN_HPP
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