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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // assert_bol_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_ASSERT_BOL_MATCHER_HPP_EAN_10_04_2005 | |
9 | #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_BOL_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/next_prior.hpp> | |
17 | #include <boost/xpressive/detail/detail_fwd.hpp> | |
18 | #include <boost/xpressive/detail/core/quant_style.hpp> | |
19 | #include <boost/xpressive/detail/core/state.hpp> | |
20 | #include <boost/xpressive/detail/core/matcher/assert_line_base.hpp> | |
21 | ||
22 | namespace boost { namespace xpressive { namespace detail | |
23 | { | |
24 | ||
25 | /////////////////////////////////////////////////////////////////////////////// | |
26 | // assert_bol_matcher | |
27 | // | |
28 | template<typename Traits> | |
29 | struct assert_bol_matcher | |
30 | : assert_line_base<Traits> | |
31 | { | |
32 | typedef typename Traits::char_type char_type; | |
33 | ||
34 | assert_bol_matcher(Traits const &tr) | |
35 | : assert_line_base<Traits>(tr) | |
36 | { | |
37 | } | |
38 | ||
39 | template<typename BidiIter, typename Next> | |
40 | bool match(match_state<BidiIter> &state, Next const &next) const | |
41 | { | |
42 | if(state.bos()) | |
43 | { | |
44 | if(!state.flags_.match_bol_) | |
45 | { | |
46 | return false; | |
47 | } | |
48 | } | |
49 | else | |
50 | { | |
51 | char_type ch = *boost::prior(state.cur_); | |
52 | ||
53 | // If the previous character is not a newline, we're not at the start of a line | |
54 | if(!traits_cast<Traits>(state).isctype(ch, this->newline_)) | |
55 | { | |
56 | return false; | |
57 | } | |
58 | // There is no line-break between \r and \n | |
59 | else if(ch == this->cr_ && !state.eos() && *state.cur_ == this->nl_) | |
60 | { | |
61 | return false; | |
62 | } | |
63 | } | |
64 | ||
65 | return next.match(state); | |
66 | } | |
67 | }; | |
68 | ||
69 | }}} | |
70 | ||
71 | #endif |