1 | /*=============================================================================
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2 | Copyright (c) 2002-2003 Joel de Guzman
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3 | Copyright (c) 2002-2003 Hartmut Kaiser
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4 | http://spirit.sourceforge.net/
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5 |
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6 | Use, modification and distribution is subject to the Boost Software
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7 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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8 | http://www.boost.org/LICENSE_1_0.txt)
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9 | =============================================================================*/
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10 | #if !defined(BOOST_SPIRIT_AS_PARSER_HPP)
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11 | #define BOOST_SPIRIT_AS_PARSER_HPP
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12 |
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13 | #include <boost/spirit/core/primitives/primitives.hpp>
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14 |
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15 | namespace boost { namespace spirit {
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16 |
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17 | ///////////////////////////////////////////////////////////////////////////
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18 | //
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19 | // Helper templates to derive the parser type from an auxilliary type
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20 | // and to generate an object of the required parser type given an
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21 | // auxilliary object. Supported types to convert are parsers,
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22 | // single characters and character strings.
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23 | //
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24 | ///////////////////////////////////////////////////////////////////////////
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25 | namespace impl
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26 | {
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27 | template<typename T>
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28 | struct default_as_parser
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29 | {
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30 | typedef T type;
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31 | static type const& convert(type const& p)
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32 | {
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33 | return p;
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34 | }
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35 | };
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36 |
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37 | struct char_as_parser
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38 | {
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39 | typedef chlit<char> type;
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40 | static type convert(char ch)
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41 | {
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42 | return type(ch);
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43 | }
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44 | };
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45 |
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46 | struct wchar_as_parser
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47 | {
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48 | typedef chlit<wchar_t> type;
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49 | static type convert(wchar_t ch)
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50 | {
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51 | return type(ch);
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52 | }
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53 | };
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54 |
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55 | struct string_as_parser
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56 | {
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57 | typedef strlit<char const*> type;
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58 | static type convert(char const* str)
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59 | {
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60 | return type(str);
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61 | }
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62 | };
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63 |
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64 | struct wstring_as_parser
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65 | {
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66 | typedef strlit<wchar_t const*> type;
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67 | static type convert(wchar_t const* str)
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68 | {
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69 | return type(str);
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70 | }
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71 | };
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72 | }
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73 |
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74 | template<typename T>
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75 | struct as_parser : impl::default_as_parser<T> {};
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76 |
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77 | template<>
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78 | struct as_parser<char> : impl::char_as_parser {};
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79 |
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80 | template<>
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81 | struct as_parser<wchar_t> : impl::wchar_as_parser {};
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82 |
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83 | template<>
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84 | struct as_parser<char*> : impl::string_as_parser {};
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85 |
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86 | template<>
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87 | struct as_parser<char const*> : impl::string_as_parser {};
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88 |
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89 | template<>
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90 | struct as_parser<wchar_t*> : impl::wstring_as_parser {};
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91 |
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92 | template<>
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93 | struct as_parser<wchar_t const*> : impl::wstring_as_parser {};
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94 |
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95 | template<int N>
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96 | struct as_parser<char[N]> : impl::string_as_parser {};
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97 |
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98 | template<int N>
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99 | struct as_parser<wchar_t[N]> : impl::wstring_as_parser {};
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100 |
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101 | template<int N>
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102 | struct as_parser<char const[N]> : impl::string_as_parser {};
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103 |
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104 | template<int N>
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105 | struct as_parser<wchar_t const[N]> : impl::wstring_as_parser {};
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106 |
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107 | }} // namespace boost::spirit
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108 |
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109 | #endif
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