]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | /*============================================================================= |
2 | Copyright (c) 2010 Daniel James | |
3 | ||
4 | Use, modification and distribution is subject to the Boost Software | |
5 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | http://www.boost.org/LICENSE_1_0.txt) | |
7 | =============================================================================*/ | |
8 | ||
9 | #if !defined(BOOST_SPIRIT_QUICKBOOK_ITERATOR_HPP) | |
10 | #define BOOST_SPIRIT_QUICKBOOK_ITERATOR_HPP | |
11 | ||
12 | #include <boost/operators.hpp> | |
13 | #include <boost/iterator/iterator_traits.hpp> | |
14 | #include <boost/range/iterator_range.hpp> | |
15 | #include <iterator> | |
b32b8144 | 16 | #include "string_view.hpp" |
7c673cae FG |
17 | |
18 | namespace quickbook | |
19 | { | |
20 | template <typename Iterator> | |
21 | struct lookback_iterator | |
22 | : boost::forward_iterator_helper< | |
23 | lookback_iterator<Iterator>, | |
24 | typename boost::iterator_value<Iterator>::type, | |
25 | typename boost::iterator_difference<Iterator>::type, | |
26 | typename boost::iterator_pointer<Iterator>::type, | |
27 | typename boost::iterator_reference<Iterator>::type | |
28 | > | |
29 | { | |
30 | lookback_iterator() {} | |
b32b8144 FG |
31 | explicit lookback_iterator(Iterator i) |
32 | : original_(i), base_(i) {} | |
7c673cae FG |
33 | |
34 | friend bool operator==( | |
35 | lookback_iterator const& x, | |
36 | lookback_iterator const& y) | |
37 | { | |
38 | return x.base_ == y.base_; | |
39 | } | |
40 | ||
41 | lookback_iterator& operator++() | |
42 | { | |
43 | ++base_; | |
44 | return *this; | |
45 | } | |
46 | ||
47 | typename boost::iterator_reference<Iterator>::type operator*() const | |
48 | { | |
49 | return *base_; | |
50 | } | |
51 | ||
52 | Iterator base() const { | |
53 | return base_; | |
54 | } | |
55 | ||
56 | typedef boost::iterator_range<std::reverse_iterator<Iterator> > | |
57 | lookback_range; | |
58 | ||
59 | lookback_range lookback() const | |
60 | { | |
61 | return lookback_range(base_, original_); | |
62 | } | |
63 | ||
64 | private: | |
65 | Iterator original_; | |
66 | Iterator base_; | |
67 | }; | |
b32b8144 FG |
68 | |
69 | typedef lookback_iterator<string_iterator> parse_iterator; | |
7c673cae FG |
70 | } |
71 | ||
72 | #endif |