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_SUBRULE_HPP)
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11 | #define BOOST_SPIRIT_SUBRULE_HPP
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12 |
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13 | #include <boost/config.hpp>
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14 | #include <boost/static_assert.hpp>
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15 |
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16 | #include <boost/spirit/core/parser.hpp>
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17 | #include <boost/spirit/core/non_terminal/parser_context.hpp>
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18 | #include <boost/spirit/core/non_terminal/impl/subrule.ipp>
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19 |
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20 | namespace boost { namespace spirit {
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21 |
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22 | ///////////////////////////////////////////////////////////////////////////
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23 | //
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24 | // subrules_scanner class
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25 | //
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26 | ///////////////////////////////////////////////////////////////////////////
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27 | template <typename ScannerT, typename ListT>
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28 | struct subrules_scanner : public ScannerT
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29 | {
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30 | typedef ScannerT scanner_t;
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31 | typedef ListT list_t;
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32 | typedef subrules_scanner<ScannerT, ListT> self_t;
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33 |
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34 | subrules_scanner(ScannerT const& scan, ListT const& list_)
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35 | : ScannerT(scan), list(list_) {}
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36 |
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37 | template <typename PoliciesT>
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38 | struct rebind_policies
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39 | {
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40 | typedef typename rebind_scanner_policies<ScannerT, PoliciesT>::type
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41 | rebind_scanner;
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42 | typedef subrules_scanner<rebind_scanner, ListT> type;
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43 | };
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44 |
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45 | template <typename PoliciesT>
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46 | subrules_scanner<
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47 | typename rebind_scanner_policies<ScannerT, PoliciesT>::type,
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48 | ListT>
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49 | change_policies(PoliciesT const& policies) const
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50 | {
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51 | typedef subrules_scanner<
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52 | BOOST_DEDUCED_TYPENAME
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53 | rebind_scanner_policies<ScannerT, PoliciesT>::type,
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54 | ListT>
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55 | subrules_scanner_t;
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56 |
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57 | return subrules_scanner_t(
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58 | ScannerT::change_policies(policies),
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59 | list);
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60 | }
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61 |
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62 | template <typename IteratorT>
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63 | struct rebind_iterator
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64 | {
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65 | typedef typename rebind_scanner_iterator<ScannerT, IteratorT>::type
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66 | rebind_scanner;
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67 | typedef subrules_scanner<rebind_scanner, ListT> type;
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68 | };
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69 |
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70 | template <typename IteratorT>
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71 | subrules_scanner<
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72 | typename rebind_scanner_iterator<ScannerT, IteratorT>::type,
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73 | ListT>
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74 | change_iterator(IteratorT const& first, IteratorT const &last) const
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75 | {
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76 | typedef subrules_scanner<
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77 | BOOST_DEDUCED_TYPENAME
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78 | rebind_scanner_iterator<ScannerT, IteratorT>::type,
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79 | ListT>
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80 | subrules_scanner_t;
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81 |
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82 | return subrules_scanner_t(
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83 | ScannerT::change_iterator(first, last),
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84 | list);
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85 | }
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86 |
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87 | ListT const& list;
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88 | };
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89 |
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90 | ///////////////////////////////////////////////////////////////////////////
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91 | //
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92 | // subrule_scanner type computer class
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93 | //
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94 | // This computer ensures that the scanner will not be recursively
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95 | // instantiated if it's not needed.
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96 | //
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97 | ///////////////////////////////////////////////////////////////////////////
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98 | template <typename ScannerT, typename ListT>
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99 | struct subrules_scanner_finder
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100 | {
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101 | typedef subrules_scanner<ScannerT, ListT> type;
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102 | };
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103 |
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104 | template <typename ScannerT, typename ListT>
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105 | struct subrules_scanner_finder<subrules_scanner<ScannerT, ListT>, ListT>
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106 | {
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107 | typedef subrules_scanner<ScannerT, ListT> type;
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108 | };
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109 |
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110 | ///////////////////////////////////////////////////////////////////////////
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111 | //
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112 | // subrule_list class
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113 | //
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114 | ///////////////////////////////////////////////////////////////////////////
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115 | template <typename FirstT, typename RestT>
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116 | struct subrule_list : public parser<subrule_list<FirstT, RestT> >
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117 | {
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118 | typedef subrule_list<FirstT, RestT> self_t;
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119 | typedef FirstT first_t;
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120 | typedef RestT rest_t;
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121 |
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122 | subrule_list(FirstT const& first_, RestT const& rest_)
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123 | : first(first_), rest(rest_) {}
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124 |
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125 | template <typename ScannerT>
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126 | struct result
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127 | {
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128 | typedef typename parser_result<FirstT, ScannerT>::type type;
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129 | };
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130 |
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131 | template <typename ScannerT>
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132 | typename parser_result<self_t, ScannerT>::type
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133 | parse(ScannerT const& scan) const
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134 | {
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135 | typedef typename subrules_scanner_finder<ScannerT, self_t>::type
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136 | subrules_scanner_t;
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137 | subrules_scanner_t g_arg(scan, *this);
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138 | return first.start.parse(g_arg);
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139 | }
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140 |
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141 | template <int ID, typename DefT, typename ContextT>
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142 | subrule_list<
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143 | FirstT,
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144 | subrule_list<
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145 | subrule_parser<ID, DefT, ContextT>,
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146 | RestT> >
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147 | operator,(subrule_parser<ID, DefT, ContextT> const& rhs)
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148 | {
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149 | return subrule_list<
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150 | FirstT,
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151 | subrule_list<
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152 | subrule_parser<ID, DefT, ContextT>,
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153 | RestT> >(
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154 | first,
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155 | subrule_list<
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156 | subrule_parser<ID, DefT, ContextT>,
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157 | RestT>(rhs, rest));
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158 | }
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159 |
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160 | FirstT first;
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161 | RestT rest;
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162 | };
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163 |
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164 | ///////////////////////////////////////////////////////////////////////////
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165 | //
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166 | // subrule_parser class
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167 | //
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168 | ///////////////////////////////////////////////////////////////////////////
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169 | template <int ID, typename ContextT = parser_context<> >
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170 | struct subrule; // Forward declaration
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171 |
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172 | template <int ID, typename DefT, typename ContextT>
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173 | struct subrule_parser
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174 | : public parser<subrule_parser<ID, DefT, ContextT> >
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175 | {
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176 | typedef subrule_parser<ID, DefT, ContextT> self_t;
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177 | typedef subrule<ID, ContextT> subrule_t;
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178 | typedef DefT def_t;
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179 |
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180 | BOOST_STATIC_CONSTANT(int, id = ID);
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181 |
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182 | template <typename ScannerT>
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183 | struct result
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184 | {
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185 | typedef typename
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186 | impl::get_subrule_parser_result<
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187 | DefT, ScannerT, typename subrule_t::attr_t>::type type;
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188 | };
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189 |
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190 | subrule_parser(subrule_t const& start_, DefT const& rhs_)
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191 | : rhs(rhs_), start(start_) {}
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192 |
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193 | template <typename ScannerT>
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194 | typename parser_result<self_t, ScannerT>::type
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195 | parse(ScannerT const& scan) const
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196 | {
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197 | // This will only be called when parsing single subrules.
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198 | typedef subrule_list<self_t, nil_t> list_t;
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199 | typedef subrules_scanner<ScannerT, list_t> scanner_t;
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200 |
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201 | list_t list(*this, nil_t());
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202 | scanner_t g_arg(scan, list);
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203 | return start.parse(g_arg);
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204 | }
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205 |
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206 | template <int ID2, typename DefT2, typename ContextT2>
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207 | inline subrule_list<
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208 | self_t,
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209 | subrule_list<
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210 | subrule_parser<ID2, DefT2, ContextT2>,
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211 | nil_t> >
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212 | operator,(subrule_parser<ID2, DefT2, ContextT2> const& rhs) const
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213 | {
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214 | return subrule_list<
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215 | self_t,
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216 | subrule_list<
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217 | subrule_parser<ID2, DefT2, ContextT2>,
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218 | nil_t> >(
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219 | *this,
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220 | subrule_list<
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221 | subrule_parser<ID2, DefT2, ContextT2>, nil_t>(
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222 | rhs, nil_t()));
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223 | }
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224 |
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225 | typename DefT::embed_t rhs;
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226 | subrule_t const& start;
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227 | };
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228 |
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229 | ///////////////////////////////////////////////////////////////////////////
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230 | //
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231 | // subrule class
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232 | //
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233 | ///////////////////////////////////////////////////////////////////////////
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234 | template <int ID, typename ContextT>
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235 | struct subrule
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236 | : public parser<subrule<ID, ContextT> >
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237 | , public ContextT::base_t
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238 | , public context_aux<ContextT, subrule<ID, ContextT> >
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239 | {
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240 | typedef subrule<ID, ContextT> self_t;
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241 | typedef subrule<ID, ContextT> const& embed_t;
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242 |
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243 | typedef typename ContextT::context_linker_t context_t;
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244 | typedef typename context_t::attr_t attr_t;
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245 |
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246 | BOOST_STATIC_CONSTANT(int, id = ID);
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247 |
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248 | template <typename ScannerT>
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249 | struct result
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250 | {
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251 | typedef typename
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252 | impl::get_subrule_result<ID, ScannerT, attr_t>::type type;
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253 | };
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254 |
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255 | template <typename ScannerT>
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256 | typename parser_result<self_t, ScannerT>::type
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257 | parse_main(ScannerT const& scan) const
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258 | {
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259 | typedef typename parser_result<self_t, ScannerT>::type result_t;
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260 | result_t result;
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261 | impl::parse_subrule<result_t, ScannerT, ID>::
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262 | do_(result, scan);
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263 | return result;
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264 | }
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265 |
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266 | template <typename ScannerT>
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267 | typename parser_result<self_t, ScannerT>::type
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268 | parse(ScannerT const& scan) const
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269 | {
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270 | typedef typename parser_result<self_t, ScannerT>::type result_t;
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271 | typedef parser_scanner_linker<ScannerT> scanner_t;
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272 | BOOST_SPIRIT_CONTEXT_PARSE(
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273 | scan, *this, scanner_t, context_t, result_t);
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274 | }
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275 |
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276 | template <typename DefT>
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277 | subrule_parser<ID, DefT, ContextT>
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278 | operator=(parser<DefT> const& rhs) const
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279 | {
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280 | return subrule_parser<ID, DefT, ContextT>(*this, rhs.derived());
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281 | }
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282 |
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283 | private:
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284 |
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285 | // assignment of subrules is not allowed. Use subrules
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286 | // with identical IDs if you want to have aliases.
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287 |
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288 | subrule& operator=(subrule const&);
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289 |
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290 | template <int ID2, typename ContextT2>
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291 | subrule& operator=(subrule<ID2, ContextT2> const&);
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292 | };
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293 |
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294 | }} // namespace boost::spirit
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295 |
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296 | #endif
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297 |
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