1 | // boost/io/quoted_manip.hpp ---------------------------------------------------------// |
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2 | |
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3 | // Copyright Beman Dawes 2010 |
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4 | |
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5 | // Distributed under the Boost Software License, Version 1.0. |
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6 | // See http://www.boost.org/LICENSE_1_0.txt |
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7 | |
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8 | // Library home page http://www.boost.org/libs/io |
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9 | |
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10 | //--------------------------------------------------------------------------------------// |
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11 | |
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12 | #ifndef BOOST_IO_QUOTED_MANIP |
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13 | #define BOOST_IO_QUOTED_MANIP |
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14 | |
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15 | #include <iosfwd> |
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16 | #include <ios> |
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17 | #include <string> |
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18 | #include <iterator> |
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19 | #include <boost/io/ios_state.hpp> |
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20 | |
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21 | namespace boost |
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22 | { |
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23 | namespace io |
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24 | { |
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25 | namespace detail { template <class String, class Char> struct quoted_proxy; } |
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26 | |
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27 | // ------------ public interface ------------------------------------------------// |
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28 | |
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29 | // manipulator for const std::basic_string& |
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30 | template <class Char, class Traits, class Alloc> |
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31 | detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> const &, Char> |
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32 | quoted(const std::basic_string<Char, Traits, Alloc>& s, |
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33 | Char escape='\\', Char delim='\"'); |
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34 | |
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35 | // manipulator for non-const std::basic_string& |
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36 | template <class Char, class Traits, class Alloc> |
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37 | detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> &, Char> |
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38 | quoted(std::basic_string<Char, Traits, Alloc>& s, |
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39 | Char escape='\\', Char delim='\"'); |
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40 | |
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41 | // manipulator for const C-string* |
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42 | template <class Char> |
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43 | detail::quoted_proxy<const Char*, Char> |
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44 | quoted(const Char* s, Char escape='\\', Char delim='\"'); |
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45 | |
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46 | // ----------- implementation details -------------------------------------------// |
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47 | |
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48 | namespace detail |
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49 | { |
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50 | // proxy used as an argument pack |
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51 | template <class String, class Char> |
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52 | struct quoted_proxy |
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53 | { |
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54 | String string; |
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55 | Char escape; |
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56 | Char delim; |
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57 | |
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58 | quoted_proxy(String s_, Char escape_, Char delim_) |
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59 | : string(s_), escape(escape_), delim(delim_) {} |
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60 | private: |
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61 | // String may be a const type, so disable the assignment operator |
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62 | quoted_proxy& operator=(const quoted_proxy&); // = deleted |
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63 | }; |
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64 | |
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65 | // abstract away difference between proxies with const or non-const basic_strings |
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66 | template <class Char, class Traits, class Alloc> |
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67 | std::basic_ostream<Char, Traits>& |
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68 | basic_string_inserter_imp(std::basic_ostream<Char, Traits>& os, |
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69 | std::basic_string<Char, Traits, Alloc> const & string, Char escape, Char delim) |
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70 | { |
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71 | os << delim; |
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72 | typename std::basic_string<Char, Traits, Alloc>::const_iterator |
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73 | end_it = string.end(); |
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74 | for (typename std::basic_string<Char, Traits, Alloc>::const_iterator |
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75 | it = string.begin(); |
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76 | it != end_it; |
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77 | ++it ) |
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78 | { |
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79 | if (*it == delim || *it == escape) |
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80 | os << escape; |
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81 | os << *it; |
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82 | } |
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83 | os << delim; |
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84 | return os; |
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85 | } |
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86 | |
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87 | // inserter for const std::basic_string& proxies |
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88 | template <class Char, class Traits, class Alloc> |
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89 | inline |
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90 | std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, |
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91 | const quoted_proxy<std::basic_string<Char, Traits, Alloc> const &, Char>& proxy) |
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92 | { |
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93 | return basic_string_inserter_imp(os, proxy.string, proxy.escape, proxy.delim); |
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94 | } |
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95 | |
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96 | // inserter for non-const std::basic_string& proxies |
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97 | template <class Char, class Traits, class Alloc> |
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98 | inline |
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99 | std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, |
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100 | const quoted_proxy<std::basic_string<Char, Traits, Alloc>&, Char>& proxy) |
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101 | { |
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102 | return basic_string_inserter_imp(os, proxy.string, proxy.escape, proxy.delim); |
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103 | } |
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104 | |
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105 | // inserter for const C-string* proxies |
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106 | template <class Char, class Traits> |
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107 | std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, |
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108 | const quoted_proxy<const Char*, Char>& proxy) |
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109 | { |
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110 | os << proxy.delim; |
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111 | for (const Char* it = proxy.string; |
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112 | *it; |
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113 | ++it ) |
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114 | { |
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115 | if (*it == proxy.delim || *it == proxy.escape) |
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116 | os << proxy.escape; |
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117 | os << *it; |
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118 | } |
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119 | os << proxy.delim; |
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120 | return os; |
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121 | } |
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122 | |
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123 | // extractor for non-const std::basic_string& proxies |
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124 | template <class Char, class Traits, class Alloc> |
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125 | std::basic_istream<Char, Traits>& operator>>(std::basic_istream<Char, Traits>& is, |
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126 | const quoted_proxy<std::basic_string<Char, Traits, Alloc>&, Char>& proxy) |
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127 | { |
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128 | Char c; |
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129 | is >> c; |
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130 | if (c != proxy.delim) |
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131 | { |
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132 | proxy.string = c; |
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133 | is >> proxy.string; |
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134 | return is; |
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135 | } |
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136 | proxy.string.clear(); |
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137 | { |
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138 | boost::io::ios_flags_saver ifs(is); |
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139 | is >> std::noskipws; |
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140 | for (;;) |
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141 | { |
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142 | is >> c; |
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143 | if (!is.good()) // cope with I/O errors or end-of-file |
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144 | break; |
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145 | if (c == proxy.escape) |
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146 | { |
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147 | is >> c; |
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148 | if (!is.good()) // cope with I/O errors or end-of-file |
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149 | break; |
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150 | } |
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151 | else if (c == proxy.delim) |
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152 | break; |
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153 | proxy.string += c; |
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154 | } |
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155 | } |
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156 | return is; |
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157 | } |
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158 | |
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159 | } // namespace detail |
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160 | |
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161 | // manipulator implementation for const std::basic_string& |
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162 | template <class Char, class Traits, class Alloc> |
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163 | inline detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> const &, Char> |
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164 | quoted(const std::basic_string<Char, Traits, Alloc>& s, Char escape, Char delim) |
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165 | { |
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166 | return detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> const &, Char> |
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167 | (s, escape, delim); |
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168 | } |
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169 | |
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170 | // manipulator implementation for non-const std::basic_string& |
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171 | template <class Char, class Traits, class Alloc> |
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172 | inline detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> &, Char> |
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173 | quoted(std::basic_string<Char, Traits, Alloc>& s, Char escape, Char delim) |
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174 | { |
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175 | return detail::quoted_proxy<std::basic_string<Char, Traits, Alloc>&, Char> |
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176 | (s, escape, delim); |
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177 | } |
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178 | |
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179 | // manipulator implementation for const C-string* |
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180 | template <class Char> |
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181 | inline detail::quoted_proxy<const Char*, Char> |
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182 | quoted(const Char* s, Char escape, Char delim) |
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183 | { |
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184 | return detail::quoted_proxy<const Char*, Char> (s, escape, delim); |
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185 | } |
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186 | |
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187 | } // namespace io |
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188 | } // namespace boost |
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189 | |
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190 | #endif // BOOST_IO_QUOTED_MANIP |
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