From 1d055261b4144dbf86b2658437015b15d4dd9bff Mon Sep 17 00:00:00 2001
From: Richard <q@1bpm.net>
Date: Sun, 4 Sep 2022 00:32:56 +0100
Subject: initial

---
 include/jsoncons/converter.hpp | 296 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 296 insertions(+)
 create mode 100644 include/jsoncons/converter.hpp

(limited to 'include/jsoncons/converter.hpp')

diff --git a/include/jsoncons/converter.hpp b/include/jsoncons/converter.hpp
new file mode 100644
index 0000000..15d1917
--- /dev/null
+++ b/include/jsoncons/converter.hpp
@@ -0,0 +1,296 @@
+// Copyright 2020 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSONCONS_CONVERTER_HPP
+#define JSONCONS_CONVERTER_HPP
+
+#include <system_error> // std::error_code
+#include <jsoncons/more_type_traits.hpp>
+#include <jsoncons/byte_string.hpp>
+#include <jsoncons/json_type.hpp>
+#include <jsoncons/conv_error.hpp>
+#include <jsoncons/detail/write_number.hpp> // from_integer
+
+namespace jsoncons {
+
+    template <class Into, class Enable=void>
+    class converter
+    {
+    };
+
+    // Into list like of bytes
+    template <class Into>
+    class converter<Into,typename std::enable_if<(!type_traits::is_basic_string<Into>::value && 
+                                                   type_traits::is_back_insertable_byte_container<Into>::value) ||
+                                                   type_traits::is_basic_byte_string<Into>::value>::type>
+    {
+        using value_type = typename Into::value_type;
+        using allocator_type = typename Into::allocator_type;
+
+    public:
+
+        JSONCONS_CPP14_CONSTEXPR 
+        Into from(const byte_string_view& bstr, semantic_tag tag, std::error_code& ec) const
+        {
+            Into bytes;
+            from_(bytes, bstr, tag, ec);
+            return bytes;
+        }
+
+        JSONCONS_CPP14_CONSTEXPR 
+        Into from(const byte_string_view& bstr, semantic_tag tag, const allocator_type& alloc, std::error_code& ec) const
+        {
+            Into bytes(alloc);
+            from_(bytes, bstr, tag, ec);
+            return bytes;
+        }
+
+        template <class CharT>
+        JSONCONS_CPP14_CONSTEXPR 
+        Into from(const jsoncons::basic_string_view<CharT>& s, semantic_tag tag, std::error_code& ec) const
+        {
+            Into bytes;
+            from_(bytes, s, tag, ec);
+            return bytes;
+        }
+
+        template <class CharT>
+        JSONCONS_CPP14_CONSTEXPR 
+        Into from(const jsoncons::basic_string_view<CharT>& s, semantic_tag tag, const allocator_type& alloc, std::error_code& ec) const
+        {
+            Into bytes(alloc);
+            from_(bytes, s, tag, ec);
+            return bytes;
+        }
+
+    private:
+        JSONCONS_CPP14_CONSTEXPR 
+        void from_(Into& bytes, const byte_string_view& bstr, semantic_tag, std::error_code&) const
+        {
+            for (auto ch : bstr)
+            {
+                bytes.push_back(static_cast<value_type>(ch));
+            }
+        }
+
+        template <class CharT>
+        JSONCONS_CPP14_CONSTEXPR 
+        typename std::enable_if<type_traits::is_narrow_character<CharT>::value>::type
+        from_(Into& bytes, const jsoncons::basic_string_view<CharT>& s, semantic_tag tag, std::error_code& ec) const
+        {
+            switch (tag)
+            {
+                case semantic_tag::base16:
+                {
+                    auto res = decode_base16(s.begin(), s.end(), bytes);
+                    if (res.ec != conv_errc::success)
+                    {
+                        ec = conv_errc::not_byte_string;
+                    }
+                    break;
+                }
+                case semantic_tag::base64:
+                {
+                    decode_base64(s.begin(), s.end(), bytes);
+                    break;
+                }
+                case semantic_tag::base64url:
+                {
+                    decode_base64url(s.begin(), s.end(), bytes);
+                    break;
+                }
+                default:
+                {
+                    ec = conv_errc::not_byte_string;
+                    break;
+                }
+            }
+        }
+
+        template <class CharT>
+        typename std::enable_if<type_traits::is_wide_character<CharT>::value>::type
+        from_(Into& bytes, const jsoncons::basic_string_view<CharT>& s, semantic_tag tag, std::error_code& ec) const
+        {
+            std::string u;
+            auto retval = unicode_traits::convert(s.data(), s.size(), u);
+            if (retval.ec != unicode_traits::conv_errc())
+            {
+                ec = conv_errc::not_utf8;
+                return;
+            }
+            from_(bytes, jsoncons::string_view(u), tag, ec);
+        }
+    };
+
+    // Into string
+    template <class Into>
+    class converter<Into,typename std::enable_if<type_traits::is_basic_string<Into>::value>::type>
+    {
+        using char_type = typename Into::value_type;
+        using allocator_type = typename Into::allocator_type;
+        int dummy_;
+    public:
+        explicit converter(int dummy = int())
+            : dummy_(dummy)
+        {}
+        template<class Integer>
+        JSONCONS_CPP14_CONSTEXPR 
+        typename std::enable_if<type_traits::is_integer<Integer>::value,Into>::type
+        from(Integer val, semantic_tag, std::error_code&) const
+        {
+            Into s;
+            jsoncons::detail::from_integer(val, s);
+            return s;
+        }
+
+        template<class Integer>
+        JSONCONS_CPP14_CONSTEXPR 
+        typename std::enable_if<type_traits::is_integer<Integer>::value,Into>::type
+        from(Integer val, semantic_tag, const allocator_type& alloc, std::error_code&) const
+        {
+            Into s(alloc);
+            jsoncons::detail::from_integer(val, s);
+            return s;
+        }
+
+        Into from(double val, semantic_tag, std::error_code&) const
+        {
+            Into s;
+            jsoncons::detail::write_double f{float_chars_format::general,0};
+            f(val, s);
+            return s;
+        }
+
+        Into from(double val, semantic_tag, const allocator_type& alloc, std::error_code&) const
+        {
+            Into s(alloc);
+            jsoncons::detail::write_double f{float_chars_format::general,0};
+            f(val, s);
+            return s;
+        }
+
+        Into from(half_arg_t, uint16_t val, semantic_tag, std::error_code&) const
+        {
+            Into s;
+            jsoncons::detail::write_double f{float_chars_format::general,0};
+            double x = binary::decode_half(val);
+            f(x, s);
+            return s;
+        }
+
+        Into from(half_arg_t, uint16_t val, semantic_tag, const allocator_type& alloc, std::error_code&) const
+        {
+            Into s(alloc);
+            jsoncons::detail::write_double f{float_chars_format::general,0};
+            double x = binary::decode_half(val);
+            f(x, s);
+            return s;
+        }
+
+        template <class ChT = char_type>
+        JSONCONS_CPP14_CONSTEXPR
+        Into from(const byte_string_view& bytes, semantic_tag tag, std::error_code& ec) const
+        {
+            Into s;
+            from_(s, bytes, tag, ec);
+            return s;
+        }
+
+        template <class ChT = char_type>
+        JSONCONS_CPP14_CONSTEXPR
+        Into from(const byte_string_view& bytes, semantic_tag tag, const allocator_type& alloc, std::error_code& ec) const
+        {
+            Into s(alloc);
+            from_(s, bytes, tag, ec);
+            return s;
+        }
+
+        constexpr 
+        Into from(const jsoncons::basic_string_view<char_type>& s, semantic_tag, std::error_code&) const
+        {
+            return Into(s.data(), s.size());
+        }
+
+        constexpr 
+        Into from(const jsoncons::basic_string_view<char_type>& s, semantic_tag, const allocator_type& alloc, std::error_code&) const
+        {
+            return Into(s.data(), s.size(), alloc);
+        }
+
+        JSONCONS_CPP14_CONSTEXPR 
+        Into from(bool val, semantic_tag, std::error_code&) const
+        {
+            constexpr const char_type* true_constant = JSONCONS_CSTRING_CONSTANT(char_type,"true"); 
+            constexpr const char_type* false_constant = JSONCONS_CSTRING_CONSTANT(char_type,"false"); 
+
+            return val ? Into(true_constant,4) : Into(false_constant,5);
+        }
+
+        JSONCONS_CPP14_CONSTEXPR 
+        Into from(bool val, semantic_tag, const allocator_type& alloc, std::error_code&) const
+        {
+            constexpr const char_type* true_constant = JSONCONS_CSTRING_CONSTANT(char_type,"true"); 
+            constexpr const char_type* false_constant = JSONCONS_CSTRING_CONSTANT(char_type,"false"); 
+
+            return val ? Into(true_constant,4,alloc) : Into(false_constant,5,alloc);
+        }
+
+        JSONCONS_CPP14_CONSTEXPR 
+        Into from(null_type, semantic_tag, std::error_code&) const
+        {
+            constexpr const char_type* null_constant = JSONCONS_CSTRING_CONSTANT(char_type,"null"); 
+
+            return Into(null_constant,4);
+        }
+
+        JSONCONS_CPP14_CONSTEXPR 
+        Into from(null_type, semantic_tag, const allocator_type& alloc, std::error_code&) const
+        {
+            constexpr const char_type* null_constant = JSONCONS_CSTRING_CONSTANT(char_type,"null"); 
+
+            return Into(null_constant,4,alloc);
+        }
+    private:
+
+        template <class ChT = char_type>
+        JSONCONS_CPP14_CONSTEXPR
+        typename std::enable_if<type_traits::is_byte<ChT>::value>::type
+        from_(Into& s, const byte_string_view& bytes, semantic_tag tag, std::error_code&) const
+        {
+            switch (tag)
+            {
+                case semantic_tag::base64:
+                    encode_base64(bytes.begin(), bytes.end(), s);
+                    break;
+                case semantic_tag::base16:
+                    encode_base16(bytes.begin(), bytes.end(), s);
+                    break;
+                default:
+                    encode_base64url(bytes.begin(), bytes.end(), s);
+                    break;
+            }
+        }
+
+        template <class ChT = char_type>
+        typename std::enable_if<!type_traits::is_byte<ChT>::value>::type
+        from_(Into& s, const byte_string_view& bytes, semantic_tag tag, std::error_code& ec) const
+        {
+            converter<std::string> convert{ dummy_ };
+            std::string u = convert.from(bytes, tag, ec);
+
+            auto retval = unicode_traits::convert(u.data(), u.size(), s);
+            if (retval.ec != unicode_traits::conv_errc())
+            {
+                ec = conv_errc::not_wide_char;
+            }
+        }
+
+    };
+
+} // namespace jsoncons
+
+#endif
+
-- 
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