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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2025 Vinnie Falco (vinnie dot falco at gmail dot com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/beast2 | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_BEAST2_FORMAT_HPP | ||
| 11 | #define BOOST_BEAST2_FORMAT_HPP | ||
| 12 | |||
| 13 | #include <boost/beast2/detail/config.hpp> | ||
| 14 | #include <boost/core/detail/string_view.hpp> | ||
| 15 | #include <memory> | ||
| 16 | #include <ostream> | ||
| 17 | #include <streambuf> | ||
| 18 | #include <string> | ||
| 19 | |||
| 20 | namespace boost { | ||
| 21 | namespace beast2 { | ||
| 22 | |||
| 23 | namespace detail { | ||
| 24 | |||
| 25 | struct format_impl | ||
| 26 | { | ||
| 27 | std::ostream& os; | ||
| 28 | core::string_view fs; | ||
| 29 | char const* p; | ||
| 30 | char const* p0; | ||
| 31 | char const* end; | ||
| 32 | bool has_placeholder = false; | ||
| 33 | |||
| 34 | 14 | format_impl( | |
| 35 | std::ostream& os_, | ||
| 36 | core::string_view fs_) | ||
| 37 | 14 | : os(os_) | |
| 38 | 14 | , fs(fs_) | |
| 39 | 14 | , p(fs.data()) | |
| 40 | 14 | , p0(p) | |
| 41 | 14 | , end(p + fs.size()) | |
| 42 | { | ||
| 43 | 14 | } | |
| 44 | |||
| 45 | core::string_view | ||
| 46 | 8 | next() | |
| 47 | { | ||
| 48 | 8 | has_placeholder = false; | |
| 49 |
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19 | while (p != end) |
| 50 | { | ||
| 51 |
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18 | if (*p++ != '{') |
| 52 | 11 | continue; | |
| 53 |
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7 | if (p == end) |
| 54 | 2 | break; | |
| 55 |
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5 | if (*p++ == '}') |
| 56 | { | ||
| 57 | core::string_view seg( | ||
| 58 | 5 | p0, (p - 2) - p0); | |
| 59 | 5 | p0 = p; | |
| 60 | 5 | has_placeholder = true; | |
| 61 | 5 | return seg; | |
| 62 | } | ||
| 63 | } | ||
| 64 | core::string_view seg( | ||
| 65 | 3 | p0, end - p0); | |
| 66 | 3 | p0 = end; | |
| 67 | 3 | return seg; | |
| 68 | } | ||
| 69 | |||
| 70 | template<class Arg> | ||
| 71 | 16 | void do_arg(Arg const& arg) | |
| 72 | { | ||
| 73 | 16 | core::string_view seg = next(); | |
| 74 |
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16 | if (seg.size()) |
| 75 |
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14 | os.write(seg.data(), static_cast< |
| 76 | 14 | std::streamsize>(seg.size())); | |
| 77 |
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16 | if (has_placeholder) |
| 78 |
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10 | os << arg; |
| 79 | 16 | }; | |
| 80 | |||
| 81 | template<class... Args> | ||
| 82 | 28 | void operator()(Args const&... args) | |
| 83 | { | ||
| 84 | using expander = int[]; | ||
| 85 | 28 | (void)expander{0, (do_arg(args), 0)...}; | |
| 86 |
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28 | if (p0 < end) |
| 87 | 20 | os.write(p0, static_cast< | |
| 88 | 20 | std::streamsize>(end - p0)); | |
| 89 | 28 | } | |
| 90 | }; | ||
| 91 | |||
| 92 | class appendbuf : public std::streambuf | ||
| 93 | { | ||
| 94 | std::string* s_; | ||
| 95 | |||
| 96 | protected: | ||
| 97 | // Called when a single character is to be written | ||
| 98 | ✗ | virtual int_type overflow(int_type ch) override | |
| 99 | { | ||
| 100 | ✗ | if (ch != traits_type::eof()) | |
| 101 | { | ||
| 102 | ✗ | s_->push_back(static_cast<char>(ch)); | |
| 103 | ✗ | return ch; | |
| 104 | } | ||
| 105 | ✗ | return traits_type::eof(); | |
| 106 | } | ||
| 107 | |||
| 108 | // Called when multiple characters are to be written | ||
| 109 | 22 | virtual std::streamsize xsputn(const char* s, std::streamsize n) override | |
| 110 | { | ||
| 111 | 22 | s_->append(s, static_cast<std::size_t>(n)); | |
| 112 | 22 | return n; | |
| 113 | } | ||
| 114 | |||
| 115 | public: | ||
| 116 | 14 | explicit appendbuf(std::string& s) | |
| 117 | 14 | : s_(&s) | |
| 118 | { | ||
| 119 | 14 | } | |
| 120 | }; | ||
| 121 | |||
| 122 | class appendstream : public std::ostream | ||
| 123 | { | ||
| 124 | appendbuf buf_; | ||
| 125 | |||
| 126 | public: | ||
| 127 | 14 | explicit appendstream(std::string& s) | |
| 128 | 14 | : std::ostream(&buf_) | |
| 129 |
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14 | , buf_(s) |
| 130 | { | ||
| 131 | 14 | } | |
| 132 | }; | ||
| 133 | |||
| 134 | } // detail | ||
| 135 | |||
| 136 | /** Format arguments using a format string | ||
| 137 | */ | ||
| 138 | template<class... Args> | ||
| 139 | void | ||
| 140 | 28 | format_to( | |
| 141 | std::ostream& os, | ||
| 142 | core::string_view fs, | ||
| 143 | Args const&... args) | ||
| 144 | { | ||
| 145 |
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28 | detail::format_impl(os, fs)(args...); |
| 146 | 28 | } | |
| 147 | |||
| 148 | /** Format arguments using a format string | ||
| 149 | */ | ||
| 150 | template<class... Args> | ||
| 151 | void | ||
| 152 | 28 | format_to( | |
| 153 | std::string& dest, | ||
| 154 | core::string_view fs, | ||
| 155 | Args const&... args) | ||
| 156 | { | ||
| 157 |
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28 | detail::appendstream ss(dest); |
| 158 |
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28 | format_to(ss, fs, args...); |
| 159 | 28 | } | |
| 160 | |||
| 161 | } // beast2 | ||
| 162 | } // boost | ||
| 163 | |||
| 164 | #endif | ||
| 165 |