Squashed 'subprojects/boost-sqlite/' content from commit 3378e35

git-subtree-dir: subprojects/boost-sqlite
git-subtree-split: 3378e353705271e569cf4ba15c467b840a39798c

1 files changed, 140 insertions, 0 deletions

diff --git a/include/boost/sqlite/json.hpp b/include/boost/sqlite/json.hpp
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+//
+// Copyright (c) 2022 Klemens Morgenstern (klemens.morgenstern@gmx.net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_SQLITE_JSON_HPP
+#define BOOST_SQLITE_JSON_HPP
+
+#include <boost/sqlite/detail/config.hpp>
+#include <boost/sqlite/field.hpp>
+#include <boost/sqlite/resultset.hpp>
+#include <boost/sqlite/value.hpp>
+#include <boost/json/parse.hpp>
+#include <boost/json/serializer.hpp>
+#include <boost/json/storage_ptr.hpp>
+#include <boost/json/value_from.hpp>
+
+BOOST_SQLITE_BEGIN_NAMESPACE
+
+struct resultset;
+struct field;
+struct value;
+
+/// @brief The subtype value used by the sqlite json extension. See the [sqlite reference](https://www.sqlite.org/json1.html)
+constexpr int json_subtype = static_cast<int>('J');
+
+inline void tag_invoke(const struct set_result_tag &, sqlite3_context * ctx, const json::value & value)
+{
+  json::serializer ser;
+  ser.reset(&value);
+
+  sqlite3_int64 len = 4096;
+  unique_ptr<char> c{static_cast<char*>(sqlite3_malloc64(len))};
+
+  len = sqlite3_msize(c.get());
+  auto v = ser.read(c.get(), len);
+
+  while (!ser.done())
+  {
+    auto l = v.size();
+    len *= 2;
+    c.reset(static_cast<char*>(sqlite3_realloc(c.release(), len)));
+    v = ser.read(c.get() + l, len);
+  }
+
+  sqlite3_result_text(ctx, c.release(), v.size(), sqlite3_free);
+  sqlite3_result_subtype(ctx, json_subtype);
+}
+
+///@{
+/// @brief Check if the value or field is a json. @ingroup reference
+inline bool is_json(const value & v) { return v.type() == value_type::text && v.subtype() == json_subtype; }
+inline bool is_json(const field & f) { return f.type() == value_type::text && f.get_value().subtype() == json_subtype; }
+///@}
+
+///@{
+/// @brief Convert the value or field to a json. @ingroup reference
+inline json::value as_json(const value & v, json::storage_ptr ptr = {})
+{
+  return json::parse(v.get_text(), ptr);
+}
+inline json::value as_json(const field & f, json::storage_ptr ptr = {})
+{
+  return json::parse(f.get_text(), ptr);
+}
+///@}
+
+
+inline void tag_invoke( const json::value_from_tag &, json::value& val, const value & f)
+{
+  switch (f.type())
+  {
+    case value_type::integer:
+      val.emplace_int64() = f.get_int();
+    break;
+    case value_type::floating:
+      val.emplace_double() = f.get_double();
+    break;
+    case value_type::text:
+    {
+      auto txt = f.get_text();
+      if (f.subtype() == json_subtype)
+        val = json::parse(txt, val.storage());
+      else
+        val.emplace_string() = txt;
+    }
+    break;
+    case value_type::blob:
+      throw_exception(std::invalid_argument("cannot convert blob to json"));
+    case value_type::null:
+      default:
+        val.emplace_null();
+  }
+}
+
+inline void tag_invoke( const json::value_from_tag &, json::value& val, const field & f)
+{
+  switch (f.type())
+  {
+    case value_type::integer:
+      val.emplace_int64() = f.get_int();
+    break;
+    case value_type::floating:
+      val.emplace_double() = f.get_double();
+    break;
+    case value_type::text:
+    {
+      auto txt = f.get_text();
+      if (f.get_value().subtype() == json_subtype)
+        val = json::parse(txt, val.storage());
+      else
+        val.emplace_string() = txt;
+    }
+    break;
+    case value_type::blob:
+      throw_exception(std::invalid_argument("cannot convert blob to json"));
+    case value_type::null:
+      default:
+        val.emplace_null();
+  }
+}
+
+inline void tag_invoke( const json::value_from_tag &, json::value& val, resultset && rs)
+{
+  auto & obj = val.emplace_array();
+
+  for (auto r : rs)
+  {
+    auto & row = obj.emplace_back(json::object(obj.storage())).get_object();
+    for (auto c : r)
+      row[c.column_name()] =  json::value_from(c, row.storage());
+  }
+}
+
+BOOST_SQLITE_END_NAMESPACE
+
+
+#endif //BOOST_SQLITE_JSON_HPP