Jeff Thompson | 86b6d64 | 2013-10-17 15:01:56 -0700 | [diff] [blame] | 1 | // ndnboost/io/quoted_manip.hpp ---------------------------------------------------------// |
| 2 | |
| 3 | // Copyright Beman Dawes 2010 |
| 4 | |
| 5 | // Distributed under the Boost Software License, Version 1.0. |
| 6 | // See http://www.boost.org/LICENSE_1_0.txt |
| 7 | |
| 8 | // Library home page http://www.boost.org/libs/io |
| 9 | |
| 10 | //--------------------------------------------------------------------------------------// |
| 11 | |
| 12 | #ifndef NDNBOOST_IO_QUOTED_MANIP |
| 13 | #define NDNBOOST_IO_QUOTED_MANIP |
| 14 | |
| 15 | #include <iosfwd> |
| 16 | #include <ios> |
| 17 | #include <string> |
| 18 | #include <iterator> |
| 19 | #include <ndnboost/io/ios_state.hpp> |
| 20 | |
| 21 | namespace ndnboost |
| 22 | { |
| 23 | namespace io |
| 24 | { |
| 25 | namespace detail { template <class String, class Char> struct quoted_proxy; } |
| 26 | |
| 27 | // ------------ public interface ------------------------------------------------// |
| 28 | |
| 29 | // manipulator for const std::basic_string& |
| 30 | template <class Char, class Traits, class Alloc> |
| 31 | detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> const &, Char> |
| 32 | quoted(const std::basic_string<Char, Traits, Alloc>& s, |
| 33 | Char escape='\\', Char delim='\"'); |
| 34 | |
| 35 | // manipulator for non-const std::basic_string& |
| 36 | template <class Char, class Traits, class Alloc> |
| 37 | detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> &, Char> |
| 38 | quoted(std::basic_string<Char, Traits, Alloc>& s, |
| 39 | Char escape='\\', Char delim='\"'); |
| 40 | |
| 41 | // manipulator for const C-string* |
| 42 | template <class Char> |
| 43 | detail::quoted_proxy<const Char*, Char> |
| 44 | quoted(const Char* s, Char escape='\\', Char delim='\"'); |
| 45 | |
| 46 | // ----------- implementation details -------------------------------------------// |
| 47 | |
| 48 | namespace detail |
| 49 | { |
| 50 | // proxy used as an argument pack |
| 51 | template <class String, class Char> |
| 52 | struct quoted_proxy |
| 53 | { |
| 54 | String string; |
| 55 | Char escape; |
| 56 | Char delim; |
| 57 | |
| 58 | quoted_proxy(String s_, Char escape_, Char delim_) |
| 59 | : string(s_), escape(escape_), delim(delim_) {} |
| 60 | private: |
| 61 | // String may be a const type, so disable the assignment operator |
| 62 | quoted_proxy& operator=(const quoted_proxy&); // = deleted |
| 63 | }; |
| 64 | |
| 65 | // abstract away difference between proxies with const or non-const basic_strings |
| 66 | template <class Char, class Traits, class Alloc> |
| 67 | std::basic_ostream<Char, Traits>& |
| 68 | basic_string_inserter_imp(std::basic_ostream<Char, Traits>& os, |
| 69 | std::basic_string<Char, Traits, Alloc> const & string, Char escape, Char delim) |
| 70 | { |
| 71 | os << delim; |
| 72 | typename std::basic_string<Char, Traits, Alloc>::const_iterator |
| 73 | end_it = string.end(); |
| 74 | for (typename std::basic_string<Char, Traits, Alloc>::const_iterator |
| 75 | it = string.begin(); |
| 76 | it != end_it; |
| 77 | ++it ) |
| 78 | { |
| 79 | if (*it == delim || *it == escape) |
| 80 | os << escape; |
| 81 | os << *it; |
| 82 | } |
| 83 | os << delim; |
| 84 | return os; |
| 85 | } |
| 86 | |
| 87 | // inserter for const std::basic_string& proxies |
| 88 | template <class Char, class Traits, class Alloc> |
| 89 | inline |
| 90 | std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, |
| 91 | const quoted_proxy<std::basic_string<Char, Traits, Alloc> const &, Char>& proxy) |
| 92 | { |
| 93 | return basic_string_inserter_imp(os, proxy.string, proxy.escape, proxy.delim); |
| 94 | } |
| 95 | |
| 96 | // inserter for non-const std::basic_string& proxies |
| 97 | template <class Char, class Traits, class Alloc> |
| 98 | inline |
| 99 | std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, |
| 100 | const quoted_proxy<std::basic_string<Char, Traits, Alloc>&, Char>& proxy) |
| 101 | { |
| 102 | return basic_string_inserter_imp(os, proxy.string, proxy.escape, proxy.delim); |
| 103 | } |
| 104 | |
| 105 | // inserter for const C-string* proxies |
| 106 | template <class Char, class Traits> |
| 107 | std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, |
| 108 | const quoted_proxy<const Char*, Char>& proxy) |
| 109 | { |
| 110 | os << proxy.delim; |
| 111 | for (const Char* it = proxy.string; |
| 112 | *it; |
| 113 | ++it ) |
| 114 | { |
| 115 | if (*it == proxy.delim || *it == proxy.escape) |
| 116 | os << proxy.escape; |
| 117 | os << *it; |
| 118 | } |
| 119 | os << proxy.delim; |
| 120 | return os; |
| 121 | } |
| 122 | |
| 123 | // extractor for non-const std::basic_string& proxies |
| 124 | template <class Char, class Traits, class Alloc> |
| 125 | std::basic_istream<Char, Traits>& operator>>(std::basic_istream<Char, Traits>& is, |
| 126 | const quoted_proxy<std::basic_string<Char, Traits, Alloc>&, Char>& proxy) |
| 127 | { |
| 128 | proxy.string.clear(); |
| 129 | Char c; |
| 130 | is >> c; |
| 131 | if (c != proxy.delim) |
| 132 | { |
| 133 | is.unget(); |
| 134 | is >> proxy.string; |
| 135 | return is; |
| 136 | } |
| 137 | { |
| 138 | ndnboost::io::ios_flags_saver ifs(is); |
| 139 | is >> std::noskipws; |
| 140 | for (;;) |
| 141 | { |
| 142 | is >> c; |
| 143 | if (!is.good()) // cope with I/O errors or end-of-file |
| 144 | break; |
| 145 | if (c == proxy.escape) |
| 146 | { |
| 147 | is >> c; |
| 148 | if (!is.good()) // cope with I/O errors or end-of-file |
| 149 | break; |
| 150 | } |
| 151 | else if (c == proxy.delim) |
| 152 | break; |
| 153 | proxy.string += c; |
| 154 | } |
| 155 | } |
| 156 | return is; |
| 157 | } |
| 158 | |
| 159 | } // namespace detail |
| 160 | |
| 161 | // manipulator implementation for const std::basic_string& |
| 162 | template <class Char, class Traits, class Alloc> |
| 163 | inline detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> const &, Char> |
| 164 | quoted(const std::basic_string<Char, Traits, Alloc>& s, Char escape, Char delim) |
| 165 | { |
| 166 | return detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> const &, Char> |
| 167 | (s, escape, delim); |
| 168 | } |
| 169 | |
| 170 | // manipulator implementation for non-const std::basic_string& |
| 171 | template <class Char, class Traits, class Alloc> |
| 172 | inline detail::quoted_proxy<std::basic_string<Char, Traits, Alloc> &, Char> |
| 173 | quoted(std::basic_string<Char, Traits, Alloc>& s, Char escape, Char delim) |
| 174 | { |
| 175 | return detail::quoted_proxy<std::basic_string<Char, Traits, Alloc>&, Char> |
| 176 | (s, escape, delim); |
| 177 | } |
| 178 | |
| 179 | // manipulator implementation for const C-string* |
| 180 | template <class Char> |
| 181 | inline detail::quoted_proxy<const Char*, Char> |
| 182 | quoted(const Char* s, Char escape, Char delim) |
| 183 | { |
| 184 | return detail::quoted_proxy<const Char*, Char> (s, escape, delim); |
| 185 | } |
| 186 | |
| 187 | } // namespace io |
| 188 | } // namespace ndnboost |
| 189 | |
| 190 | #endif // NDNBOOST_IO_QUOTED_MANIP |