forked from OSchip/llvm-project
460 lines
17 KiB
C++
460 lines
17 KiB
C++
// -*- C++ -*-
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//===-------------------------- functional --------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_EXPERIMENTAL_FUNCTIONAL
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#define _LIBCPP_EXPERIMENTAL_FUNCTIONAL
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/*
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experimental/functional synopsis
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#include <algorithm>
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namespace std {
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namespace experimental {
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inline namespace fundamentals_v1 {
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// See C++14 20.9.9, Function object binders
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template <class T> constexpr bool is_bind_expression_v
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= is_bind_expression<T>::value;
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template <class T> constexpr int is_placeholder_v
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= is_placeholder<T>::value;
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// 4.2, Class template function
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template<class> class function; // undefined
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template<class R, class... ArgTypes> class function<R(ArgTypes...)>;
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template<class R, class... ArgTypes>
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void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&);
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template<class R, class... ArgTypes>
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bool operator==(const function<R(ArgTypes...)>&, nullptr_t) noexcept;
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template<class R, class... ArgTypes>
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bool operator==(nullptr_t, const function<R(ArgTypes...)>&) noexcept;
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template<class R, class... ArgTypes>
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bool operator!=(const function<R(ArgTypes...)>&, nullptr_t) noexcept;
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template<class R, class... ArgTypes>
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bool operator!=(nullptr_t, const function<R(ArgTypes...)>&) noexcept;
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// 4.3, Searchers
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template<class ForwardIterator, class BinaryPredicate = equal_to<>>
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class default_searcher;
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template<class RandomAccessIterator,
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class Hash = hash<typename iterator_traits<RandomAccessIterator>::value_type>,
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class BinaryPredicate = equal_to<>>
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class boyer_moore_searcher;
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template<class RandomAccessIterator,
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class Hash = hash<typename iterator_traits<RandomAccessIterator>::value_type>,
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class BinaryPredicate = equal_to<>>
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class boyer_moore_horspool_searcher;
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template<class ForwardIterator, class BinaryPredicate = equal_to<>>
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default_searcher<ForwardIterator, BinaryPredicate>
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make_default_searcher(ForwardIterator pat_first, ForwardIterator pat_last,
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BinaryPredicate pred = BinaryPredicate());
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template<class RandomAccessIterator,
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class Hash = hash<typename iterator_traits<RandomAccessIterator>::value_type>,
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class BinaryPredicate = equal_to<>>
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boyer_moore_searcher<RandomAccessIterator, Hash, BinaryPredicate>
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make_boyer_moore_searcher(
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RandomAccessIterator pat_first, RandomAccessIterator pat_last,
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Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
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template<class RandomAccessIterator,
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class Hash = hash<typename iterator_traits<RandomAccessIterator>::value_type>,
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class BinaryPredicate = equal_to<>>
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boyer_moore_horspool_searcher<RandomAccessIterator, Hash, BinaryPredicate>
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make_boyer_moore_horspool_searcher(
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RandomAccessIterator pat_first, RandomAccessIterator pat_last,
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Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
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} // namespace fundamentals_v1
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} // namespace experimental
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template<class R, class... ArgTypes, class Alloc>
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struct uses_allocator<experimental::function<R(ArgTypes...)>, Alloc>;
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} // namespace std
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*/
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#include <experimental/__config>
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#include <functional>
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#include <algorithm>
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#include <type_traits>
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#include <vector>
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#include <array>
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#include <unordered_map>
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#include <__undef_min_max>
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#include <__debug>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_LFTS
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#if _LIBCPP_STD_VER > 11
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// default searcher
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template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
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_LIBCPP_TYPE_VIS
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class default_searcher {
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public:
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_LIBCPP_INLINE_VISIBILITY
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default_searcher(_ForwardIterator __f, _ForwardIterator __l,
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_BinaryPredicate __p = _BinaryPredicate())
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: __first_(__f), __last_(__l), __pred_(__p) {}
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template <typename _ForwardIterator2>
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_LIBCPP_INLINE_VISIBILITY
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pair<_ForwardIterator2, _ForwardIterator2>
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operator () (_ForwardIterator2 __f, _ForwardIterator2 __l) const
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{
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return _VSTD::__search(__f, __l, __first_, __last_, __pred_,
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typename _VSTD::iterator_traits<_ForwardIterator>::iterator_category(),
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typename _VSTD::iterator_traits<_ForwardIterator2>::iterator_category());
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}
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private:
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_ForwardIterator __first_;
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_ForwardIterator __last_;
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_BinaryPredicate __pred_;
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};
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template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
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_LIBCPP_INLINE_VISIBILITY
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default_searcher<_ForwardIterator, _BinaryPredicate>
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make_default_searcher( _ForwardIterator __f, _ForwardIterator __l, _BinaryPredicate __p = _BinaryPredicate ())
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{
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return default_searcher<_ForwardIterator, _BinaryPredicate>(__f, __l, __p);
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}
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template<class _Key, class _Value, class _Hash, class _BinaryPredicate, bool /*useArray*/> class _BMSkipTable;
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// General case for BM data searching; use a map
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template<class _Key, typename _Value, class _Hash, class _BinaryPredicate>
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class _BMSkipTable<_Key, _Value, _Hash, _BinaryPredicate, false> {
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public: // TODO private:
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typedef _Value value_type;
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typedef _Key key_type;
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const _Value __default_value_;
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std::unordered_map<_Key, _Value, _Hash, _BinaryPredicate> __table;
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public:
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_LIBCPP_INLINE_VISIBILITY
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_BMSkipTable(std::size_t __sz, _Value __default, _Hash __hf, _BinaryPredicate __pred)
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: __default_value_(__default), __table(__sz, __hf, __pred) {}
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_LIBCPP_INLINE_VISIBILITY
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void insert(const key_type &__key, value_type __val)
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{
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__table [__key] = __val; // Would skip_.insert (val) be better here?
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}
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_LIBCPP_INLINE_VISIBILITY
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value_type operator [](const key_type & __key) const
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{
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auto __it = __table.find (__key);
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return __it == __table.end() ? __default_value_ : __it->second;
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}
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};
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// Special case small numeric values; use an array
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template<class _Key, typename _Value, class _Hash, class _BinaryPredicate>
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class _BMSkipTable<_Key, _Value, _Hash, _BinaryPredicate, true> {
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private:
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typedef _Value value_type;
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typedef _Key key_type;
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typedef typename std::make_unsigned<key_type>::type unsigned_key_type;
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typedef std::array<value_type, _VSTD::numeric_limits<unsigned_key_type>::max()> skip_map;
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skip_map __table;
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public:
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_LIBCPP_INLINE_VISIBILITY
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_BMSkipTable(std::size_t /*__sz*/, _Value __default, _Hash /*__hf*/, _BinaryPredicate /*__pred*/)
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{
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std::fill_n(__table.begin(), __table.size(), __default);
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}
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_LIBCPP_INLINE_VISIBILITY
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void insert(key_type __key, value_type __val)
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{
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__table[static_cast<unsigned_key_type>(__key)] = __val;
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}
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_LIBCPP_INLINE_VISIBILITY
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value_type operator [](key_type __key) const
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{
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return __table[static_cast<unsigned_key_type>(__key)];
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}
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};
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template <class _RandomAccessIterator1,
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class _Hash = hash<typename iterator_traits<_RandomAccessIterator1>::value_type>,
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class _BinaryPredicate = equal_to<>>
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_LIBCPP_TYPE_VIS
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class boyer_moore_searcher {
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private:
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typedef typename std::iterator_traits<_RandomAccessIterator1>::difference_type difference_type;
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typedef typename std::iterator_traits<_RandomAccessIterator1>::value_type value_type;
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typedef _BMSkipTable<value_type, difference_type, _Hash, _BinaryPredicate,
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_VSTD::is_integral<value_type>::value && // what about enums?
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sizeof(value_type) == 1 &&
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is_same<_Hash, hash<value_type>>::value &&
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is_same<_BinaryPredicate, equal_to<>>::value
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> skip_table_type;
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public:
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boyer_moore_searcher(_RandomAccessIterator1 __f, _RandomAccessIterator1 __l,
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_Hash __hf = _Hash(), _BinaryPredicate __pred = _BinaryPredicate())
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: __first_(__f), __last_(__l), __pred_(__pred),
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__pattern_length_(_VSTD::distance(__first_, __last_)),
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__skip_{make_shared<skip_table_type>(__pattern_length_, -1, __hf, __pred_)},
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__suffix_{make_shared<vector<difference_type>>(__pattern_length_ + 1)}
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{
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// build the skip table
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for ( difference_type __i = 0; __f != __l; ++__f, (void) ++__i )
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__skip_->insert(*__f, __i);
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this->__build_suffix_table ( __first_, __last_, __pred_ );
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}
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template <typename _RandomAccessIterator2>
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pair<_RandomAccessIterator2, _RandomAccessIterator2>
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operator ()(_RandomAccessIterator2 __f, _RandomAccessIterator2 __l) const
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{
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static_assert ( std::is_same<
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typename std::decay<typename std::iterator_traits<_RandomAccessIterator1>::value_type>::type,
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typename std::decay<typename std::iterator_traits<_RandomAccessIterator2>::value_type>::type
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>::value,
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"Corpus and Pattern iterators must point to the same type" );
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if (__f == __l ) return make_pair(__l, __l); // empty corpus
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if (__first_ == __last_) return make_pair(__f, __f); // empty pattern
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// If the pattern is larger than the corpus, we can't find it!
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if ( __pattern_length_ > _VSTD::distance (__f, __l))
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return make_pair(__l, __l);
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// Do the search
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return this->__search(__f, __l);
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}
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public: // TODO private:
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_RandomAccessIterator1 __first_;
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_RandomAccessIterator1 __last_;
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_BinaryPredicate __pred_;
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difference_type __pattern_length_;
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shared_ptr<skip_table_type> __skip_;
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shared_ptr<vector<difference_type>> __suffix_;
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template <typename _RandomAccessIterator2>
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pair<_RandomAccessIterator2, _RandomAccessIterator2>
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__search(_RandomAccessIterator2 __f, _RandomAccessIterator2 __l) const
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{
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_RandomAccessIterator2 __cur = __f;
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const _RandomAccessIterator2 __last = __l - __pattern_length_;
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const skip_table_type & __skip = *__skip_.get();
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const vector<difference_type> & __suffix = *__suffix_.get();
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while (__cur <= __last)
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{
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// Do we match right where we are?
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difference_type __j = __pattern_length_;
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while (__pred_(__first_ [__j-1], __cur [__j-1])) {
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__j--;
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// We matched - we're done!
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if ( __j == 0 )
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return make_pair(__cur, __cur + __pattern_length_);
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}
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// Since we didn't match, figure out how far to skip forward
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difference_type __k = __skip[__cur [ __j - 1 ]];
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difference_type __m = __j - __k - 1;
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if (__k < __j && __m > __suffix[ __j ])
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__cur += __m;
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else
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__cur += __suffix[ __j ];
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}
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return make_pair(__l, __l); // We didn't find anything
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}
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template<typename _Iterator, typename _Container>
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void __compute_bm_prefix ( _Iterator __f, _Iterator __l, _BinaryPredicate __pred, _Container &__prefix )
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{
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const std::size_t __count = _VSTD::distance(__f, __l);
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__prefix[0] = 0;
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std::size_t __k = 0;
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for ( std::size_t __i = 1; __i < __count; ++__i )
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{
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while ( __k > 0 && !__pred ( __f[__k], __f[__i] ))
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__k = __prefix [ __k - 1 ];
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if ( __pred ( __f[__k], __f[__i] ))
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__k++;
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__prefix [ __i ] = __k;
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}
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}
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void __build_suffix_table(_RandomAccessIterator1 __f, _RandomAccessIterator1 __l,
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_BinaryPredicate __pred)
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{
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const std::size_t __count = _VSTD::distance(__f, __l);
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vector<difference_type> & __suffix = *__suffix_.get();
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if (__count > 0)
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{
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_VSTD::vector<value_type> __scratch(__count);
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__compute_bm_prefix(__f, __l, __pred, __scratch);
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for ( std::size_t __i = 0; __i <= __count; __i++ )
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__suffix[__i] = __count - __scratch[__count-1];
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typedef _VSTD::reverse_iterator<_RandomAccessIterator1> _RevIter;
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__compute_bm_prefix(_RevIter(__l), _RevIter(__f), __pred, __scratch);
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for ( std::size_t __i = 0; __i < __count; __i++ )
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{
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const std::size_t __j = __count - __scratch[__i];
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const difference_type __k = __i - __scratch[__i] + 1;
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if (__suffix[__j] > __k)
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__suffix[__j] = __k;
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}
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}
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}
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};
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template<class _RandomAccessIterator,
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class _Hash = hash<typename iterator_traits<_RandomAccessIterator>::value_type>,
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class _BinaryPredicate = equal_to<>>
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_LIBCPP_INLINE_VISIBILITY
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boyer_moore_searcher<_RandomAccessIterator, _Hash, _BinaryPredicate>
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make_boyer_moore_searcher( _RandomAccessIterator __f, _RandomAccessIterator __l,
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_Hash __hf = _Hash(), _BinaryPredicate __p = _BinaryPredicate ())
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{
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return boyer_moore_searcher<_RandomAccessIterator, _Hash, _BinaryPredicate>(__f, __l, __hf, __p);
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}
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// boyer-moore-horspool
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template <class _RandomAccessIterator1,
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class _Hash = hash<typename iterator_traits<_RandomAccessIterator1>::value_type>,
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class _BinaryPredicate = equal_to<>>
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_LIBCPP_TYPE_VIS
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class boyer_moore_horspool_searcher {
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private:
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typedef typename std::iterator_traits<_RandomAccessIterator1>::difference_type difference_type;
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typedef typename std::iterator_traits<_RandomAccessIterator1>::value_type value_type;
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typedef _BMSkipTable<value_type, difference_type, _Hash, _BinaryPredicate,
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_VSTD::is_integral<value_type>::value && // what about enums?
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sizeof(value_type) == 1 &&
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is_same<_Hash, hash<value_type>>::value &&
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is_same<_BinaryPredicate, equal_to<>>::value
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> skip_table_type;
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public:
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boyer_moore_horspool_searcher(_RandomAccessIterator1 __f, _RandomAccessIterator1 __l,
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_Hash __hf = _Hash(), _BinaryPredicate __pred = _BinaryPredicate())
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: __first_(__f), __last_(__l), __pred_(__pred),
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__pattern_length_(_VSTD::distance(__first_, __last_)),
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__skip_{_VSTD::make_shared<skip_table_type>(__pattern_length_, __pattern_length_, __hf, __pred_)}
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{
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// build the skip table
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if ( __f != __l )
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{
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__l = __l - 1;
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for ( difference_type __i = 0; __f != __l; ++__f, (void) ++__i )
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__skip_->insert(*__f, __pattern_length_ - 1 - __i);
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}
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}
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template <typename _RandomAccessIterator2>
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pair<_RandomAccessIterator2, _RandomAccessIterator2>
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operator ()(_RandomAccessIterator2 __f, _RandomAccessIterator2 __l) const
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{
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static_assert ( std::is_same<
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typename std::decay<typename std::iterator_traits<_RandomAccessIterator1>::value_type>::type,
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typename std::decay<typename std::iterator_traits<_RandomAccessIterator2>::value_type>::type
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>::value,
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"Corpus and Pattern iterators must point to the same type" );
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if (__f == __l ) return make_pair(__l, __l); // empty corpus
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if (__first_ == __last_) return make_pair(__f, __f); // empty pattern
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// If the pattern is larger than the corpus, we can't find it!
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if ( __pattern_length_ > _VSTD::distance (__f, __l))
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return make_pair(__l, __l);
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// Do the search
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return this->__search(__f, __l);
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}
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private:
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_RandomAccessIterator1 __first_;
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_RandomAccessIterator1 __last_;
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_BinaryPredicate __pred_;
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difference_type __pattern_length_;
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shared_ptr<skip_table_type> __skip_;
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template <typename _RandomAccessIterator2>
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pair<_RandomAccessIterator2, _RandomAccessIterator2>
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__search ( _RandomAccessIterator2 __f, _RandomAccessIterator2 __l ) const {
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_RandomAccessIterator2 __cur = __f;
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const _RandomAccessIterator2 __last = __l - __pattern_length_;
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const skip_table_type & __skip = *__skip_.get();
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while (__cur <= __last)
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{
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// Do we match right where we are?
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difference_type __j = __pattern_length_;
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while (__pred_(__first_[__j-1], __cur[__j-1]))
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{
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__j--;
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// We matched - we're done!
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if ( __j == 0 )
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return make_pair(__cur, __cur + __pattern_length_);
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}
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__cur += __skip[__cur[__pattern_length_-1]];
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}
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return make_pair(__l, __l);
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}
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};
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template<class _RandomAccessIterator,
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class _Hash = hash<typename iterator_traits<_RandomAccessIterator>::value_type>,
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class _BinaryPredicate = equal_to<>>
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_LIBCPP_INLINE_VISIBILITY
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boyer_moore_horspool_searcher<_RandomAccessIterator, _Hash, _BinaryPredicate>
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make_boyer_moore_horspool_searcher( _RandomAccessIterator __f, _RandomAccessIterator __l,
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_Hash __hf = _Hash(), _BinaryPredicate __p = _BinaryPredicate ())
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{
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return boyer_moore_horspool_searcher<_RandomAccessIterator, _Hash, _BinaryPredicate>(__f, __l, __hf, __p);
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}
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#endif // _LIBCPP_STD_VER > 11
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_LIBCPP_END_NAMESPACE_LFTS
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#endif /* _LIBCPP_EXPERIMENTAL_FUNCTIONAL */
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