]>
Commit | Line | Data |
---|---|---|
1 | /////////////////////////////////////////////////////////////////////////////// | |
2 | // logical_newline_matcher.hpp | |
3 | // | |
4 | // Copyright 2008 Eric Niebler. Distributed under the Boost | |
5 | // Software License, Version 1.0. (See accompanying file | |
6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_LOGICAL_NEWLINE_MATCHER_HPP_EAN_10_04_2005 | |
9 | #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_LOGICAL_NEWLINE_MATCHER_HPP_EAN_10_04_2005 | |
10 | ||
11 | // MS compatible compilers support #pragma once | |
12 | #if defined(_MSC_VER) | |
13 | # pragma once | |
14 | #endif | |
15 | ||
16 | #include <boost/xpressive/detail/detail_fwd.hpp> | |
17 | #include <boost/xpressive/detail/core/quant_style.hpp> | |
18 | #include <boost/xpressive/detail/core/state.hpp> | |
19 | ||
20 | namespace boost { namespace xpressive { namespace detail | |
21 | { | |
22 | ||
23 | ////////////////////////////////////////////////////////////////////////// | |
24 | // logical_newline_matcher | |
25 | // | |
26 | template<typename Traits> | |
27 | struct logical_newline_matcher | |
28 | : quant_style_variable_width | |
29 | { | |
30 | typedef typename Traits::char_type char_type; | |
31 | typedef typename Traits::char_class_type char_class_type; | |
32 | ||
33 | logical_newline_matcher(Traits const &tr) | |
34 | : newline_(lookup_classname(tr, "newline")) | |
35 | , nl_(tr.widen('\n')) | |
36 | , cr_(tr.widen('\r')) | |
37 | { | |
38 | } | |
39 | ||
40 | template<typename BidiIter, typename Next> | |
41 | bool match(match_state<BidiIter> &state, Next const &next) const | |
42 | { | |
43 | if(state.eos()) | |
44 | { | |
45 | return false; | |
46 | } | |
47 | ||
48 | char_type ch = *state.cur_; | |
49 | if(traits_cast<Traits>(state).isctype(ch, this->newline_)) | |
50 | { | |
51 | ++state.cur_; | |
52 | if(this->cr_ == ch && !state.eos() && this->nl_ == *state.cur_) | |
53 | { | |
54 | ++state.cur_; | |
55 | if(next.match(state)) | |
56 | { | |
57 | return true; | |
58 | } | |
59 | --state.cur_; | |
60 | } | |
61 | else if(next.match(state)) | |
62 | { | |
63 | return true; | |
64 | } | |
65 | ||
66 | --state.cur_; | |
67 | } | |
68 | return false; | |
69 | } | |
70 | ||
71 | char_class_type newline() const | |
72 | { | |
73 | return this->newline_; | |
74 | } | |
75 | ||
76 | private: | |
77 | char_class_type newline_; | |
78 | char_type nl_, cr_; | |
79 | }; | |
80 | ||
81 | }}} | |
82 | ||
83 | #endif |