1 | /*=============================================================================
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2 | Copyright (c) 2001-2003 Joel de Guzman
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3 | Copyright (c) 2002-2003 Martin Wille
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4 | Copyright (c) 2003 Hartmut Kaiser
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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 | #if !defined BOOST_SPIRIT_GRAMMAR_IPP
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12 | #define BOOST_SPIRIT_GRAMMAR_IPP
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13 |
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14 | #if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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15 | #include <boost/spirit/core/non_terminal/impl/object_with_id.ipp>
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16 | #include <algorithm>
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17 | #include <functional>
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18 | #include <memory> // for std::auto_ptr
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19 | #include <boost/weak_ptr.hpp>
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20 | #endif
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21 |
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22 | #ifdef BOOST_SPIRIT_THREADSAFE
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23 | #include <boost/thread/tss.hpp>
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24 | #include <boost/thread/mutex.hpp>
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25 | #endif
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26 |
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27 | ///////////////////////////////////////////////////////////////////////////////
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28 | namespace boost { namespace spirit {
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29 |
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30 | template <typename DerivedT, typename ContextT>
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31 | struct grammar;
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32 |
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33 | #if defined(BOOST_MSVC) && (BOOST_MSVC <= 1200)
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34 |
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35 | BOOST_SPIRIT_DEPENDENT_TEMPLATE_WRAPPER(grammar_definition_wrapper, definition);
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36 |
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37 | //////////////////////////////////
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38 | template <typename GrammarT, typename ScannerT>
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39 | struct grammar_definition
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40 | {
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41 | typedef typename impl::grammar_definition_wrapper<GrammarT>
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42 | ::template result_<ScannerT>::param_t type;
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43 | };
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44 |
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45 | #else
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46 |
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47 | //////////////////////////////////
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48 | template <typename GrammarT, typename ScannerT>
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49 | struct grammar_definition
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50 | {
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51 | typedef typename GrammarT::template definition<ScannerT> type;
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52 | };
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53 |
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54 | #endif
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55 |
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56 | namespace impl
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57 | {
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58 |
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59 | #if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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60 | struct grammar_tag {};
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61 |
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62 | //////////////////////////////////
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63 | template <typename GrammarT>
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64 | struct grammar_helper_base
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65 | {
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66 | virtual int undefine(GrammarT *) = 0;
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67 | virtual ~grammar_helper_base() {}
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68 | };
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69 |
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70 | //////////////////////////////////
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71 | template <typename GrammarT>
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72 | struct grammar_helper_list
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73 | {
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74 | typedef GrammarT grammar_t;
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75 | typedef grammar_helper_base<GrammarT> helper_t;
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76 | typedef std::vector<helper_t*> vector_t;
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77 |
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78 | grammar_helper_list() {}
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79 | grammar_helper_list(grammar_helper_list const& /*x*/)
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80 | { // Does _not_ copy the helpers member !
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81 | }
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82 |
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83 | grammar_helper_list& operator=(grammar_helper_list const& x)
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84 | { // Does _not_ copy the helpers member !
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85 | return *this;
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86 | }
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87 |
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88 | void push_back(helper_t *helper)
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89 | { helpers.push_back(helper); }
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90 |
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91 | void pop_back()
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92 | { helpers.pop_back(); }
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93 |
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94 | typename vector_t::size_type
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95 | size() const
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96 | { return helpers.size(); }
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97 |
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98 | typename vector_t::reverse_iterator
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99 | rbegin()
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100 | { return helpers.rbegin(); }
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101 |
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102 | typename vector_t::reverse_iterator
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103 | rend()
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104 | { return helpers.rend(); }
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105 |
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106 | #ifdef BOOST_SPIRIT_THREADSAFE
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107 | boost::mutex & mutex()
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108 | { return m; }
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109 | #endif
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110 |
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111 | private:
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112 |
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113 | vector_t helpers;
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114 | #ifdef BOOST_SPIRIT_THREADSAFE
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115 | boost::mutex m;
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116 | #endif
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117 | };
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118 |
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119 | //////////////////////////////////
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120 | struct grammartract_helper_list;
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121 |
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122 | #if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE) \
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123 | && (!defined(__GNUC__) || (__GNUC__ > 2))
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124 |
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125 | struct grammartract_helper_list
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126 | {
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127 | template<typename GrammarT>
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128 | static grammar_helper_list<GrammarT>&
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129 | do_(GrammarT const* g)
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130 | {
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131 | return g->helpers;
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132 | }
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133 | };
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134 |
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135 | #endif
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136 |
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137 | //////////////////////////////////
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138 | template <typename GrammarT, typename DerivedT, typename ScannerT>
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139 | struct grammar_helper : private grammar_helper_base<GrammarT>
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140 | {
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141 | typedef GrammarT grammar_t;
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142 | typedef ScannerT scanner_t;
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143 | typedef DerivedT derived_t;
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144 | typedef typename grammar_definition<DerivedT, ScannerT>::type definition_t;
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145 |
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146 | typedef grammar_helper<grammar_t, derived_t, scanner_t> helper_t;
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147 | typedef boost::shared_ptr<helper_t> helper_ptr_t;
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148 | typedef boost::weak_ptr<helper_t> helper_weak_ptr_t;
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149 |
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150 | grammar_helper*
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151 | this_() { return this; }
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152 |
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153 | grammar_helper(helper_weak_ptr_t& p)
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154 | : definitions_cnt(0)
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155 | , self(this_())
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156 | { p = self; }
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157 |
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158 | definition_t&
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159 | define(grammar_t const* target_grammar)
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160 | {
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161 | grammar_helper_list<GrammarT> &helpers =
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162 | #if !defined(__GNUC__) || (__GNUC__ > 2)
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163 | grammartract_helper_list::do_(target_grammar);
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164 | #else
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165 | target_grammar->helpers;
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166 | #endif
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167 | typename grammar_t::object_id id = target_grammar->get_object_id();
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168 |
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169 | if (definitions.size()<=id)
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170 | definitions.resize(id*3/2+1);
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171 | if (definitions[id]!=0)
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172 | return *definitions[id];
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173 |
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174 | std::auto_ptr<definition_t>
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175 | result(new definition_t(target_grammar->derived()));
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176 |
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177 | #ifdef BOOST_SPIRIT_THREADSAFE
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178 | boost::mutex::scoped_lock lock(helpers.mutex());
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179 | #endif
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180 | helpers.push_back(this);
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181 |
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182 | ++definitions_cnt;
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183 | definitions[id] = result.get();
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184 | return *(result.release());
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185 | }
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186 |
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187 | int
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188 | undefine(grammar_t* target_grammar)
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189 | {
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190 | typename grammar_t::object_id id = target_grammar->get_object_id();
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191 |
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192 | if (definitions.size()<=id)
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193 | return 0;
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194 | delete definitions[id];
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195 | definitions[id] = 0;
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196 | if (--definitions_cnt==0)
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197 | self.reset();
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198 | return 0;
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199 | }
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200 |
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201 | private:
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202 |
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203 | std::vector<definition_t*> definitions;
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204 | unsigned long definitions_cnt;
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205 | helper_ptr_t self;
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206 | };
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207 |
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208 | #endif /* defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE) */
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209 |
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210 | template<typename DerivedT, typename ContextT, typename ScannerT>
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211 | inline typename DerivedT::template definition<ScannerT> &
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212 | get_definition(grammar<DerivedT, ContextT> const* self)
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213 | {
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214 | #if defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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215 |
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216 | typedef typename DerivedT::template definition<ScannerT> definition_t;
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217 | static definition_t def(self->derived());
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218 | return def;
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219 | #else
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220 | typedef grammar<DerivedT, ContextT> self_t;
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221 | typedef impl::grammar_helper<self_t, DerivedT, ScannerT> helper_t;
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222 | typedef typename helper_t::helper_weak_ptr_t ptr_t;
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223 |
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224 | # ifdef BOOST_SPIRIT_THREADSAFE
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225 | static boost::thread_specific_ptr<ptr_t> tld_helper;
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226 | if (!tld_helper.get())
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227 | tld_helper.reset(new ptr_t);
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228 | ptr_t &helper = *tld_helper;
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229 | # else
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230 | static ptr_t helper;
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231 | # endif
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232 | if (!boost::make_shared(helper).get())
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233 | new helper_t(helper);
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234 | return boost::make_shared(helper)->define(self);
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235 | #endif
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236 | }
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237 |
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238 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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239 | template <int N>
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240 | struct call_helper {
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241 |
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242 | template <typename RT, typename DefinitionT, typename ScannerT>
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243 | static void
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244 | do_ (RT &result, DefinitionT &def, ScannerT const &scan)
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245 | {
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246 | result = def.template get_start_parser<N>()->parse(scan);
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247 | }
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248 | };
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249 | #else
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250 | // The grammar_def stuff isn't supported for compilers, which do not
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251 | // support partial template specialization
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252 | template <int N> struct call_helper;
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253 | #endif
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254 |
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255 | template <>
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256 | struct call_helper<0> {
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257 |
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258 | template <typename RT, typename DefinitionT, typename ScannerT>
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259 | static void
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260 | do_ (RT &result, DefinitionT &def, ScannerT const &scan)
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261 | {
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262 | result = def.start().parse(scan);
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263 | }
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264 | };
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265 |
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266 | //////////////////////////////////
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267 | template<int N, typename DerivedT, typename ContextT, typename ScannerT>
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268 | inline typename parser_result<grammar<DerivedT, ContextT>, ScannerT>::type
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269 | grammar_parser_parse(
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270 | grammar<DerivedT, ContextT> const* self,
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271 | ScannerT const &scan)
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272 | {
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273 | typedef
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274 | typename parser_result<grammar<DerivedT, ContextT>, ScannerT>::type
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275 | result_t;
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276 | typedef typename DerivedT::template definition<ScannerT> definition_t;
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277 |
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278 | result_t result;
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279 | definition_t &def = get_definition<DerivedT, ContextT, ScannerT>(self);
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280 |
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281 | call_helper<N>::do_(result, def, scan);
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282 | return result;
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283 | }
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284 |
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285 | //////////////////////////////////
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286 | template<typename GrammarT>
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287 | inline void
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288 | grammar_destruct(GrammarT* self)
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289 | {
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290 | #if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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291 | typedef impl::grammar_helper_base<GrammarT> helper_base_t;
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292 | typedef grammar_helper_list<GrammarT> helper_list_t;
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293 | typedef typename helper_list_t::vector_t::reverse_iterator iterator_t;
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294 |
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295 | helper_list_t& helpers =
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296 | # if !defined(__GNUC__) || (__GNUC__ > 2)
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297 | grammartract_helper_list::do_(self);
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298 | # else
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299 | self->helpers;
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300 | # endif
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301 |
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302 | # if (defined(BOOST_MSVC) && (BOOST_MSVC <= 1200)) \
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303 | || defined(BOOST_INTEL_CXX_VERSION)
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304 | for (iterator_t i = helpers.rbegin(); i != helpers.rend(); ++i)
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305 | (*i)->undefine(self);
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306 | # else
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307 | std::for_each(helpers.rbegin(), helpers.rend(),
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308 | std::bind2nd(std::mem_fun(&helper_base_t::undefine), self));
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309 | # endif
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310 |
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311 | #else
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312 | (void)self;
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313 | #endif
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314 | }
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315 |
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316 | ///////////////////////////////////////////////////////////////////////////
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317 | //
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318 | // entry_grammar class
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319 | //
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320 | ///////////////////////////////////////////////////////////////////////////
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321 | template <typename DerivedT, int N, typename ContextT>
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322 | class entry_grammar
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323 | : public parser<entry_grammar<DerivedT, N, ContextT> >
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324 | {
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325 |
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326 | public:
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327 | typedef entry_grammar<DerivedT, N, ContextT> self_t;
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328 | typedef self_t embed_t;
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329 | typedef typename ContextT::context_linker_t context_t;
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330 | typedef typename context_t::attr_t attr_t;
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331 |
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332 | template <typename ScannerT>
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333 | struct result
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334 | {
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335 | typedef typename match_result<ScannerT, attr_t>::type type;
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336 | };
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337 |
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338 | entry_grammar(DerivedT const &p) : target_grammar(p) {}
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339 |
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340 | template <typename ScannerT>
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341 | typename parser_result<self_t, ScannerT>::type
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342 | parse_main(ScannerT const& scan) const
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343 | { return impl::grammar_parser_parse<N>(&target_grammar, scan); }
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344 |
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345 | template <typename ScannerT>
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346 | typename parser_result<self_t, ScannerT>::type
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347 | parse(ScannerT const& scan) const
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348 | {
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349 | typedef typename parser_result<self_t, ScannerT>::type result_t;
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350 | typedef parser_scanner_linker<ScannerT> scanner_t;
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351 | BOOST_SPIRIT_CONTEXT_PARSE(scan, target_grammar, scanner_t,
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352 | context_t, result_t)
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353 | }
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354 |
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355 | private:
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356 | DerivedT const &target_grammar;
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357 | };
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358 |
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359 | } // namespace impl
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360 |
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361 | ///////////////////////////////////////
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362 | #if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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363 | #define BOOST_SPIRIT_GRAMMAR_ID , public impl::object_with_id<impl::grammar_tag>
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364 | #else
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365 | #define BOOST_SPIRIT_GRAMMAR_ID
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366 | #endif
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367 |
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368 | ///////////////////////////////////////
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369 | #if !defined(__GNUC__) || (__GNUC__ > 2)
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370 | #define BOOST_SPIRIT_GRAMMAR_ACCESS private:
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371 | #else
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372 | #define BOOST_SPIRIT_GRAMMAR_ACCESS
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373 | #endif
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374 |
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375 | ///////////////////////////////////////
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376 | #if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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377 | #define BOOST_SPIRIT_GRAMMAR_STATE \
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378 | BOOST_SPIRIT_GRAMMAR_ACCESS \
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379 | friend struct impl::grammartract_helper_list; \
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380 | mutable impl::grammar_helper_list<self_t> helpers;
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381 | #else
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382 | #define BOOST_SPIRIT_GRAMMAR_STATE
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383 | #endif
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384 |
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385 | ///////////////////////////////////////////////////////////////////////////////
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386 | }} // namespace boost::spirit
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387 |
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388 | #endif
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