1 | /*=============================================================================
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2 | Copyright (c) 2002 Juan Carlos Arevalo-Baeza
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3 | Copyright (c) 2002-2003 Hartmut Kaiser
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4 | Copyright (c) 2003 Giovanni Bajo
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5 | http://spirit.sourceforge.net/
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6 |
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7 | Use, modification and distribution is subject to the Boost Software
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8 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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9 | http://www.boost.org/LICENSE_1_0.txt)
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10 | =============================================================================*/
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11 | #ifndef POSITION_ITERATOR_IPP
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12 | #define POSITION_ITERATOR_IPP
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13 |
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14 | #include <boost/config.hpp>
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15 | #include <boost/iterator_adaptors.hpp>
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16 | #include <boost/type_traits/add_const.hpp>
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17 | #include <boost/mpl/if.hpp>
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18 | #include <boost/type_traits/is_same.hpp>
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19 | #include <boost/spirit/core/nil.hpp> // for nil_t
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20 | #include <boost/detail/iterator.hpp> // for boost::detail::iterator_traits
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21 |
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22 | namespace boost { namespace spirit {
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23 |
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24 | ///////////////////////////////////////////////////////////////////////////////
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25 | //
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26 | // position_policy<file_position_without_column>
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27 | //
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28 | // Specialization to handle file_position_without_column. Only take care of
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29 | // newlines since no column tracking is needed.
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30 | //
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31 | ///////////////////////////////////////////////////////////////////////////////
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32 | template <>
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33 | class position_policy<file_position_without_column> {
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34 |
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35 | public:
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36 | void next_line(file_position_without_column& pos)
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37 | {
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38 | ++pos.line;
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39 | }
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40 |
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41 | void set_tab_chars(unsigned int /*chars*/){}
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42 | void next_char(file_position_without_column& /*pos*/) {}
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43 | void tabulation(file_position_without_column& /*pos*/) {}
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44 | };
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45 |
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46 | ///////////////////////////////////////////////////////////////////////////////
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47 | //
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48 | // position_policy<file_position>
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49 | //
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50 | // Specialization to handle file_position. Track characters and tabulation
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51 | // to compute the current column correctly.
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52 | //
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53 | // Default tab size is 4. You can change this with the set_tabchars member
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54 | // of position_iterator.
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55 | //
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56 | ///////////////////////////////////////////////////////////////////////////////
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57 | template <>
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58 | class position_policy<file_position> {
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59 |
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60 | public:
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61 | position_policy()
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62 | : m_CharsPerTab(4)
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63 | {}
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64 |
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65 | void next_line(file_position& pos)
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66 | {
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67 | ++pos.line;
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68 | pos.column = 1;
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69 | }
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70 |
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71 | void set_tab_chars(unsigned int chars)
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72 | {
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73 | m_CharsPerTab = chars;
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74 | }
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75 |
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76 | void next_char(file_position& pos)
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77 | {
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78 | ++pos.column;
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79 | }
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80 |
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81 | void tabulation(file_position& pos)
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82 | {
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83 | pos.column += m_CharsPerTab - (pos.column - 1) % m_CharsPerTab;
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84 | }
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85 |
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86 | private:
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87 | unsigned int m_CharsPerTab;
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88 | };
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89 |
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90 | /* namespace boost::spirit { */ namespace iterator_ { namespace impl {
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91 |
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92 | ///////////////////////////////////////////////////////////////////////////////
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93 | //
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94 | // position_iterator_base_generator
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95 | //
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96 | // Metafunction to generate the iterator type using boost::iterator_adaptors,
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97 | // hiding all the metaprogramming thunking code in it. It is used
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98 | // mainly to keep the public interface (position_iterator) cleanear.
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99 | //
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100 | ///////////////////////////////////////////////////////////////////////////////
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101 | template <typename MainIterT, typename ForwardIterT, typename PositionT>
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102 | struct position_iterator_base_generator
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103 | {
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104 | private:
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105 | typedef boost::detail::iterator_traits<ForwardIterT> traits;
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106 | typedef typename traits::value_type value_type;
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107 | typedef typename traits::iterator_category iter_category_t;
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108 |
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109 | // Position iterator is always a non-mutable iterator
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110 | typedef typename boost::add_const<value_type>::type const_value_type;
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111 |
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112 | public:
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113 | // Check if the MainIterT is nil. If it's nil, it means that the actual
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114 | // self type is position_iterator. Otherwise, it's a real type we
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115 | // must use
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116 | typedef typename boost::mpl::if_<
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117 | typename boost::is_same<MainIterT, nil_t>::type,
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118 | position_iterator<ForwardIterT, PositionT, nil_t>,
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119 | MainIterT
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120 | >::type main_iter_t;
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121 |
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122 | typedef boost::iterator_adaptor<
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123 | main_iter_t,
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124 | ForwardIterT,
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125 | const_value_type
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126 | > type;
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127 | };
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128 |
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129 | }}}} /* namespace boost::spirit::iterator_::impl */
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130 |
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131 | #endif
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