1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___FILESYSTEM_PATH_ITERATOR_H 11 #define _LIBCPP___FILESYSTEM_PATH_ITERATOR_H 12 13 #include <__assert> 14 #include <__config> 15 #include <__filesystem/path.h> 16 #include <__iterator/iterator_traits.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 #if _LIBCPP_STD_VER >= 17 23 24 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM 25 26 class _LIBCPP_EXPORTED_FROM_ABI path::iterator { 27 public: 28 enum _ParserState : unsigned char { 29 _Singular, 30 _BeforeBegin, 31 _InRootName, 32 _InRootDir, 33 _InFilenames, 34 _InTrailingSep, 35 _AtEnd 36 }; 37 38 public: 39 typedef input_iterator_tag iterator_category; 40 typedef bidirectional_iterator_tag iterator_concept; 41 42 typedef path value_type; 43 typedef ptrdiff_t difference_type; 44 typedef const path* pointer; 45 typedef path reference; 46 47 public: 48 _LIBCPP_HIDE_FROM_ABI iterator() : __stashed_elem_(), __path_ptr_(nullptr), __entry_(), __state_(_Singular) {} 49 50 _LIBCPP_HIDE_FROM_ABI iterator(const iterator&) = default; 51 _LIBCPP_HIDE_FROM_ABI ~iterator() = default; 52 53 _LIBCPP_HIDE_FROM_ABI iterator& operator=(const iterator&) = default; 54 55 _LIBCPP_HIDE_FROM_ABI reference operator*() const { return __stashed_elem_; } 56 57 _LIBCPP_HIDE_FROM_ABI pointer operator->() const { return &__stashed_elem_; } 58 59 _LIBCPP_HIDE_FROM_ABI iterator& operator++() { 60 _LIBCPP_ASSERT_NON_NULL(__state_ != _Singular, "attempting to increment a singular iterator"); 61 _LIBCPP_ASSERT_UNCATEGORIZED(__state_ != _AtEnd, "attempting to increment the end iterator"); 62 return __increment(); 63 } 64 65 _LIBCPP_HIDE_FROM_ABI iterator operator++(int) { 66 iterator __it(*this); 67 this->operator++(); 68 return __it; 69 } 70 71 _LIBCPP_HIDE_FROM_ABI iterator& operator--() { 72 _LIBCPP_ASSERT_NON_NULL(__state_ != _Singular, "attempting to decrement a singular iterator"); 73 _LIBCPP_ASSERT_UNCATEGORIZED( 74 __entry_.data() != __path_ptr_->native().data(), "attempting to decrement the begin iterator"); 75 return __decrement(); 76 } 77 78 _LIBCPP_HIDE_FROM_ABI iterator operator--(int) { 79 iterator __it(*this); 80 this->operator--(); 81 return __it; 82 } 83 84 private: 85 friend class path; 86 87 inline _LIBCPP_HIDE_FROM_ABI friend bool operator==(const iterator&, const iterator&); 88 89 iterator& __increment(); 90 iterator& __decrement(); 91 92 path __stashed_elem_; 93 const path* __path_ptr_; 94 path::__string_view __entry_; 95 _ParserState __state_; 96 }; 97 98 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY 99 inline _LIBCPP_HIDE_FROM_ABI bool operator==(const path::iterator& __lhs, const path::iterator& __rhs) { 100 return __lhs.__path_ptr_ == __rhs.__path_ptr_ && __lhs.__entry_.data() == __rhs.__entry_.data(); 101 } 102 103 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY 104 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const path::iterator& __lhs, const path::iterator& __rhs) { 105 return !(__lhs == __rhs); 106 } 107 108 _LIBCPP_END_NAMESPACE_FILESYSTEM 109 110 #endif // _LIBCPP_STD_VER >= 17 111 112 #endif // _LIBCPP___FILESYSTEM_PATH_ITERATOR_H 113