1 /*
2 *
3 * Copyright (c) 2003
4 * John Maddock
5 *
6 * Use, modification and distribution are subject to the
7 * Boost Software License, Version 1.0. (See accompanying file
8 * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 *
10 */
11
12 /*
13 * LOCATION: see http://www.boost.org for most recent version.
14 * FILE regex_iterator.hpp
15 * VERSION see <boost/version.hpp>
16 * DESCRIPTION: Provides regex_iterator implementation.
17 */
18
19 #ifndef BOOST_REGEX_V4_REGEX_ITERATOR_HPP
20 #define BOOST_REGEX_V4_REGEX_ITERATOR_HPP
21
22 #include <boost/shared_ptr.hpp>
23
24 namespace boost{
25
26 #ifdef BOOST_MSVC
27 #pragma warning(push)
28 #pragma warning(disable: 4103)
29 #endif
30 #ifdef BOOST_HAS_ABI_HEADERS
31 # include BOOST_ABI_PREFIX
32 #endif
33 #ifdef BOOST_MSVC
34 #pragma warning(pop)
35 #endif
36
37 template <class BidirectionalIterator,
38 class charT,
39 class traits>
40 class regex_iterator_implementation
41 {
42 typedef basic_regex<charT, traits> regex_type;
43
44 match_results<BidirectionalIterator> what; // current match
45 BidirectionalIterator base; // start of sequence
46 BidirectionalIterator end; // end of sequence
47 const regex_type re; // the expression
48 match_flag_type flags; // flags for matching
49
50 public:
regex_iterator_implementation(const regex_type * p,BidirectionalIterator last,match_flag_type f)51 regex_iterator_implementation(const regex_type* p, BidirectionalIterator last, match_flag_type f)
52 : base(), end(last), re(*p), flags(f){}
regex_iterator_implementation(const regex_iterator_implementation & other)53 regex_iterator_implementation(const regex_iterator_implementation& other)
54 :what(other.what), base(other.base), end(other.end), re(other.re), flags(other.flags){}
init(BidirectionalIterator first)55 bool init(BidirectionalIterator first)
56 {
57 base = first;
58 return regex_search(first, end, what, re, flags);
59 }
compare(const regex_iterator_implementation & that)60 bool compare(const regex_iterator_implementation& that)
61 {
62 if(this == &that) return true;
63 return (&re.get_data() == &that.re.get_data()) && (end == that.end) && (flags == that.flags) && (what[0].first == that.what[0].first) && (what[0].second == that.what[0].second);
64 }
get()65 const match_results<BidirectionalIterator>& get()
66 { return what; }
next()67 bool next()
68 {
69 //if(what.prefix().first != what[0].second)
70 // flags |= match_prev_avail;
71 BidirectionalIterator next_start = what[0].second;
72 match_flag_type f(flags);
73 if(!what.length() || (f & regex_constants::match_posix))
74 f |= regex_constants::match_not_initial_null;
75 //if(base != next_start)
76 // f |= regex_constants::match_not_bob;
77 bool result = regex_search(next_start, end, what, re, f, base);
78 if(result)
79 what.set_base(base);
80 return result;
81 }
82 private:
83 regex_iterator_implementation& operator=(const regex_iterator_implementation&);
84 };
85
86 template <class BidirectionalIterator,
87 class charT = BOOST_DEDUCED_TYPENAME BOOST_REGEX_DETAIL_NS::regex_iterator_traits<BidirectionalIterator>::value_type,
88 class traits = regex_traits<charT> >
89 class regex_iterator
90 {
91 private:
92 typedef regex_iterator_implementation<BidirectionalIterator, charT, traits> impl;
93 typedef shared_ptr<impl> pimpl;
94 public:
95 typedef basic_regex<charT, traits> regex_type;
96 typedef match_results<BidirectionalIterator> value_type;
97 typedef typename BOOST_REGEX_DETAIL_NS::regex_iterator_traits<BidirectionalIterator>::difference_type
98 difference_type;
99 typedef const value_type* pointer;
100 typedef const value_type& reference;
101 typedef std::forward_iterator_tag iterator_category;
102
regex_iterator()103 regex_iterator(){}
regex_iterator(BidirectionalIterator a,BidirectionalIterator b,const regex_type & re,match_flag_type m=match_default)104 regex_iterator(BidirectionalIterator a, BidirectionalIterator b,
105 const regex_type& re,
106 match_flag_type m = match_default)
107 : pdata(new impl(&re, b, m))
108 {
109 if(!pdata->init(a))
110 {
111 pdata.reset();
112 }
113 }
regex_iterator(const regex_iterator & that)114 regex_iterator(const regex_iterator& that)
115 : pdata(that.pdata) {}
operator =(const regex_iterator & that)116 regex_iterator& operator=(const regex_iterator& that)
117 {
118 pdata = that.pdata;
119 return *this;
120 }
operator ==(const regex_iterator & that) const121 bool operator==(const regex_iterator& that)const
122 {
123 if((pdata.get() == 0) || (that.pdata.get() == 0))
124 return pdata.get() == that.pdata.get();
125 return pdata->compare(*(that.pdata.get()));
126 }
operator !=(const regex_iterator & that) const127 bool operator!=(const regex_iterator& that)const
128 { return !(*this == that); }
operator *() const129 const value_type& operator*()const
130 { return pdata->get(); }
operator ->() const131 const value_type* operator->()const
132 { return &(pdata->get()); }
operator ++()133 regex_iterator& operator++()
134 {
135 cow();
136 if(0 == pdata->next())
137 {
138 pdata.reset();
139 }
140 return *this;
141 }
operator ++(int)142 regex_iterator operator++(int)
143 {
144 regex_iterator result(*this);
145 ++(*this);
146 return result;
147 }
148 private:
149
150 pimpl pdata;
151
cow()152 void cow()
153 {
154 // copy-on-write
155 if(pdata.get() && !pdata.unique())
156 {
157 pdata.reset(new impl(*(pdata.get())));
158 }
159 }
160 };
161
162 typedef regex_iterator<const char*> cregex_iterator;
163 typedef regex_iterator<std::string::const_iterator> sregex_iterator;
164 #ifndef BOOST_NO_WREGEX
165 typedef regex_iterator<const wchar_t*> wcregex_iterator;
166 typedef regex_iterator<std::wstring::const_iterator> wsregex_iterator;
167 #endif
168
169 // make_regex_iterator:
170 template <class charT, class traits>
make_regex_iterator(const charT * p,const basic_regex<charT,traits> & e,regex_constants::match_flag_type m=regex_constants::match_default)171 inline regex_iterator<const charT*, charT, traits> make_regex_iterator(const charT* p, const basic_regex<charT, traits>& e, regex_constants::match_flag_type m = regex_constants::match_default)
172 {
173 return regex_iterator<const charT*, charT, traits>(p, p+traits::length(p), e, m);
174 }
175 template <class charT, class traits, class ST, class SA>
make_regex_iterator(const std::basic_string<charT,ST,SA> & p,const basic_regex<charT,traits> & e,regex_constants::match_flag_type m=regex_constants::match_default)176 inline regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits> make_regex_iterator(const std::basic_string<charT, ST, SA>& p, const basic_regex<charT, traits>& e, regex_constants::match_flag_type m = regex_constants::match_default)
177 {
178 return regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits>(p.begin(), p.end(), e, m);
179 }
180
181 #ifdef BOOST_MSVC
182 #pragma warning(push)
183 #pragma warning(disable: 4103)
184 #endif
185 #ifdef BOOST_HAS_ABI_HEADERS
186 # include BOOST_ABI_SUFFIX
187 #endif
188 #ifdef BOOST_MSVC
189 #pragma warning(pop)
190 #endif
191
192 } // namespace boost
193
194 #endif // BOOST_REGEX_V4_REGEX_ITERATOR_HPP
195
196