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/staj2_cursor.hpp | 1178 +++++++++++++++++++++++++++++++++++++
 1 file changed, 1178 insertions(+)
 create mode 100644 include/jsoncons/staj2_cursor.hpp

(limited to 'include/jsoncons/staj2_cursor.hpp')

diff --git a/include/jsoncons/staj2_cursor.hpp b/include/jsoncons/staj2_cursor.hpp
new file mode 100644
index 0000000..4cbbc2f
--- /dev/null
+++ b/include/jsoncons/staj2_cursor.hpp
@@ -0,0 +1,1178 @@
+// Copyright 2018 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_STAJ2_CURSOR_HPP
+#define JSONCONS_STAJ2_CURSOR_HPP
+
+#include <memory> // std::allocator
+#include <string>
+#include <stdexcept>
+#include <system_error>
+#include <ios>
+#include <type_traits> // std::enable_if
+#include <array> // std::array
+#include <functional> // std::function
+#include <jsoncons/json_exception.hpp>
+#include <jsoncons/json_visitor2.hpp>
+#include <jsoncons/bigint.hpp>
+#include <jsoncons/json_parser.hpp>
+#include <jsoncons/ser_context.hpp>
+#include <jsoncons/sink.hpp>
+#include <jsoncons/detail/write_number.hpp>
+#include <jsoncons/json_type_traits.hpp>
+#include <jsoncons/typed_array_view.hpp>
+#include <jsoncons/converter.hpp>
+
+namespace jsoncons {
+
+    enum class staj2_event_type
+    {
+        begin_array,
+        end_array,
+        begin_object,
+        end_object,
+        string_value,
+        byte_string_value,
+        null_value,
+        bool_value,
+        int64_value,
+        uint64_value,
+        half_value,
+        double_value
+    };
+
+    template <class CharT>
+    std::basic_ostream<CharT>& operator<<(std::basic_ostream<CharT>& os, staj2_event_type tag)
+    {
+        static constexpr const CharT* begin_array_name = JSONCONS_CSTRING_CONSTANT(CharT, "begin_array");
+        static constexpr const CharT* end_array_name = JSONCONS_CSTRING_CONSTANT(CharT, "end_array");
+        static constexpr const CharT* begin_object_name = JSONCONS_CSTRING_CONSTANT(CharT, "begin_object");
+        static constexpr const CharT* end_object_name = JSONCONS_CSTRING_CONSTANT(CharT, "end_object");
+        static constexpr const CharT* string_value_name = JSONCONS_CSTRING_CONSTANT(CharT, "string_value");
+        static constexpr const CharT* byte_string_value_name = JSONCONS_CSTRING_CONSTANT(CharT, "byte_string_value");
+        static constexpr const CharT* null_value_name = JSONCONS_CSTRING_CONSTANT(CharT, "null_value");
+        static constexpr const CharT* bool_value_name = JSONCONS_CSTRING_CONSTANT(CharT, "bool_value");
+        static constexpr const CharT* uint64_value_name = JSONCONS_CSTRING_CONSTANT(CharT, "uint64_value");
+        static constexpr const CharT* int64_value_name = JSONCONS_CSTRING_CONSTANT(CharT, "int64_value");
+        static constexpr const CharT* half_value_name = JSONCONS_CSTRING_CONSTANT(CharT, "half_value");
+        static constexpr const CharT* double_value_name = JSONCONS_CSTRING_CONSTANT(CharT, "double_value");
+
+        switch (tag)
+        {
+            case staj2_event_type::begin_array:
+            {
+                os << begin_array_name;
+                break;
+            }
+            case staj2_event_type::end_array:
+            {
+                os << end_array_name;
+                break;
+            }
+            case staj2_event_type::begin_object:
+            {
+                os << begin_object_name;
+                break;
+            }
+            case staj2_event_type::end_object:
+            {
+                os << end_object_name;
+                break;
+            }
+            case staj2_event_type::string_value:
+            {
+                os << string_value_name;
+                break;
+            }
+            case staj2_event_type::byte_string_value:
+            {
+                os << byte_string_value_name;
+                break;
+            }
+            case staj2_event_type::null_value:
+            {
+                os << null_value_name;
+                break;
+            }
+            case staj2_event_type::bool_value:
+            {
+                os << bool_value_name;
+                break;
+            }
+            case staj2_event_type::int64_value:
+            {
+                os << int64_value_name;
+                break;
+            }
+            case staj2_event_type::uint64_value:
+            {
+                os << uint64_value_name;
+                break;
+            }
+            case staj2_event_type::half_value:
+            {
+                os << half_value_name;
+                break;
+            }
+            case staj2_event_type::double_value:
+            {
+                os << double_value_name;
+                break;
+            }
+        }
+        return os;
+    }
+
+    template<class CharT>
+    class basic_staj2_event
+    {
+        staj2_event_type event_type_;
+        semantic_tag tag_;
+        uint64_t ext_tag_;
+        union
+        {
+            bool bool_value_;
+            int64_t int64_value_;
+            uint64_t uint64_value_;
+            uint16_t half_value_;
+            double double_value_;
+            const CharT* string_data_;
+            const uint8_t* byte_string_data_;
+        } value_;
+        std::size_t length_;
+    public:
+        using string_view_type = jsoncons::basic_string_view<CharT>;
+
+        basic_staj2_event(staj2_event_type event_type, semantic_tag tag = semantic_tag::none)
+            : event_type_(event_type), tag_(tag), ext_tag_(0), value_(), length_(0)
+        {
+        }
+
+        basic_staj2_event(staj2_event_type event_type, std::size_t length, semantic_tag tag = semantic_tag::none)
+            : event_type_(event_type), tag_(tag), ext_tag_(0), value_(), length_(length)
+        {
+        }
+
+        basic_staj2_event(null_type, semantic_tag tag)
+            : event_type_(staj2_event_type::null_value), tag_(tag), ext_tag_(0), value_(), length_(0)
+        {
+        }
+
+        basic_staj2_event(bool value, semantic_tag tag)
+            : event_type_(staj2_event_type::bool_value), tag_(tag), ext_tag_(0), length_(0)
+        {
+            value_.bool_value_ = value;
+        }
+
+        basic_staj2_event(int64_t value, semantic_tag tag)
+            : event_type_(staj2_event_type::int64_value), tag_(tag), ext_tag_(0), length_(0)
+        {
+            value_.int64_value_ = value;
+        }
+
+        basic_staj2_event(uint64_t value, semantic_tag tag)
+            : event_type_(staj2_event_type::uint64_value), tag_(tag), ext_tag_(0), length_(0)
+        {
+            value_.uint64_value_ = value;
+        }
+
+        basic_staj2_event(half_arg_t, uint16_t value, semantic_tag tag)
+            : event_type_(staj2_event_type::half_value), tag_(tag), ext_tag_(0), length_(0)
+        {
+            value_.half_value_ = value;
+        }
+
+        basic_staj2_event(double value, semantic_tag tag)
+            : event_type_(staj2_event_type::double_value), tag_(tag), ext_tag_(0), length_(0)
+        {
+            value_.double_value_ = value;
+        }
+
+        basic_staj2_event(const string_view_type& s,
+            staj2_event_type event_type,
+            semantic_tag tag = semantic_tag::none)
+            : event_type_(event_type), tag_(tag), ext_tag_(0), length_(s.length())
+        {
+            value_.string_data_ = s.data();
+        }
+
+        basic_staj2_event(const byte_string_view& s,
+            staj2_event_type event_type,
+            semantic_tag tag = semantic_tag::none)
+            : event_type_(event_type), tag_(tag), ext_tag_(0), length_(s.size())
+        {
+            value_.byte_string_data_ = s.data();
+        }
+
+        basic_staj2_event(const byte_string_view& s,
+            staj2_event_type event_type,
+            uint64_t ext_tag)
+            : event_type_(event_type), tag_(semantic_tag::ext), ext_tag_(ext_tag), length_(s.size())
+        {
+            value_.byte_string_data_ = s.data();
+        }
+
+        std::size_t size() const
+        {
+            return length_;
+        }
+
+        template <class T>
+        T get() const
+        {
+            std::error_code ec;
+            T val = get<T>(ec);
+            if (ec)
+            {
+                JSONCONS_THROW(ser_error(ec));
+            }
+            return val;
+        }
+
+        template<class T, class CharT_ = CharT>
+        typename std::enable_if<type_traits::is_basic_string<T>::value && std::is_same<typename T::value_type, CharT_>::value, T>::type
+        get(std::error_code& ec) const
+        {
+            converter<T> conv;
+            switch (event_type_)
+            {
+                case staj2_event_type::string_value:
+                    return conv.from(jsoncons::basic_string_view<CharT>(value_.string_data_, length_), tag(), ec);
+                case staj2_event_type::byte_string_value:
+                {
+                    return conv.from(byte_string_view(value_.byte_string_data_,length_),
+                                                   tag(),
+                                                   ec);
+                }
+                case staj2_event_type::uint64_value:
+                {
+                    return conv.from(value_.uint64_value_, tag(), ec);
+                }
+                case staj2_event_type::int64_value:
+                {
+                    return conv.from(value_.int64_value_, tag(), ec);
+                }
+                case staj2_event_type::half_value:
+                {
+                    return conv.from(half_arg, value_.half_value_, tag(), ec);
+                }
+                case staj2_event_type::double_value:
+                {
+                    return conv.from(value_.double_value_, tag(), ec);
+                }
+                case staj2_event_type::bool_value:
+                {
+                    return conv.from(value_.bool_value_,tag(),ec);
+                }
+                case staj2_event_type::null_value:
+                {
+                    return conv.from(null_type(),tag(),ec);
+                }
+                default:
+                {
+                    ec = conv_errc::not_string;
+                    return T{};
+                }
+            }
+        }
+
+        template<class T, class CharT_ = CharT>
+        typename std::enable_if<type_traits::is_basic_string_view<T>::value && std::is_same<typename T::value_type, CharT_>::value, T>::type
+            get(std::error_code& ec) const
+        {
+            T s;
+            switch (event_type_)
+            {
+            case staj2_event_type::string_value:
+                s = T(value_.string_data_, length_);
+                break;
+            default:
+                ec = conv_errc::not_string_view;
+                break;        
+            }
+            return s;
+        }
+
+        template<class T>
+        typename std::enable_if<std::is_same<T, byte_string_view>::value, T>::type
+            get(std::error_code& ec) const
+        {
+            T s;
+            switch (event_type_)
+            {
+                case staj2_event_type::byte_string_value:
+                    s = T(value_.byte_string_data_, length_);
+                    break;
+                default:
+                    ec = conv_errc::not_byte_string_view;
+                    break;
+            }
+            return s;
+        }
+
+        template<class T>
+        typename std::enable_if<type_traits::is_list_like<T>::value &&
+                                std::is_same<typename T::value_type,uint8_t>::value,T>::type
+        get(std::error_code& ec) const
+        {
+            converter<T> conv;
+            switch (event_type_)
+            {
+                case staj2_event_type::byte_string_value:
+                    return conv.from(byte_string_view(value_.byte_string_data_, length_), tag(), ec);
+                case staj2_event_type::string_value:
+                    return conv.from(jsoncons::basic_string_view<CharT>(value_.string_data_, length_), tag(), ec);
+                default:
+                    ec = conv_errc::not_byte_string;
+                    return T{};
+            }
+        }
+
+        template <class IntegerType>
+        typename std::enable_if<type_traits::is_integer<IntegerType>::value, IntegerType>::type
+        get(std::error_code& ec) const
+        {
+            switch (event_type_)
+            {
+                case staj2_event_type::string_value:
+                {
+                    IntegerType val;
+                    auto result = jsoncons::detail::to_integer(value_.string_data_, length_, val);
+                    if (!result)
+                    {
+                        ec = conv_errc::not_integer;
+                        return IntegerType();
+                    }
+                    return val;
+                }
+                case staj2_event_type::half_value:
+                    return static_cast<IntegerType>(value_.half_value_);
+                case staj2_event_type::double_value:
+                    return static_cast<IntegerType>(value_.double_value_);
+                case staj2_event_type::int64_value:
+                    return static_cast<IntegerType>(value_.int64_value_);
+                case staj2_event_type::uint64_value:
+                    return static_cast<IntegerType>(value_.uint64_value_);
+                case staj2_event_type::bool_value:
+                    return static_cast<IntegerType>(value_.bool_value_ ? 1 : 0);
+                default:
+                    ec = conv_errc::not_integer;
+                    return IntegerType();
+            }
+        }
+
+        template<class T>
+        typename std::enable_if<std::is_floating_point<T>::value, T>::type
+            get(std::error_code& ec) const
+        {
+            return static_cast<T>(as_double(ec));
+        }
+
+        template<class T>
+        typename std::enable_if<type_traits::is_bool<T>::value, T>::type
+            get(std::error_code& ec) const
+        {
+            return as_bool(ec);
+        }
+
+        staj2_event_type event_type() const noexcept { return event_type_; }
+
+        semantic_tag tag() const noexcept { return tag_; }
+
+        uint64_t ext_tag() const noexcept { return ext_tag_; }
+
+    private:
+
+        double as_double(std::error_code& ec) const
+        {
+            switch (event_type_)
+            {
+                case staj2_event_type::string_value:
+                {
+                    jsoncons::detail::chars_to f;
+                    return f(value_.string_data_, length_);
+                }
+                case staj2_event_type::double_value:
+                    return value_.double_value_;
+                case staj2_event_type::int64_value:
+                    return static_cast<double>(value_.int64_value_);
+                case staj2_event_type::uint64_value:
+                    return static_cast<double>(value_.uint64_value_);
+                case staj2_event_type::half_value:
+                {
+                    double x = binary::decode_half(value_.half_value_);
+                    return static_cast<double>(x);
+                }
+                default:
+                    ec = conv_errc::not_double;
+                    return double();
+            }
+        }
+
+        bool as_bool(std::error_code& ec) const
+        {
+            switch (event_type_)
+            {
+                case staj2_event_type::bool_value:
+                    return value_.bool_value_;
+                case staj2_event_type::double_value:
+                    return value_.double_value_ != 0.0;
+                case staj2_event_type::int64_value:
+                    return value_.int64_value_ != 0;
+                case staj2_event_type::uint64_value:
+                    return value_.uint64_value_ != 0;
+                default:
+                    ec = conv_errc::not_bool;
+                    return bool();
+            }
+        }
+    };
+
+    // basic_staj2_visitor
+
+    enum class staj2_cursor_state
+    {
+        typed_array = 1,
+        multi_dim,
+        shape
+    };
+
+    template <class CharT>
+    class basic_staj2_visitor : public basic_json_visitor2<CharT>
+    {
+        using super_type = basic_json_visitor2<CharT>;
+    public:
+        using char_type = CharT;
+        using typename super_type::string_view_type;
+    private:
+        std::function<bool(const basic_staj2_event<CharT>&, const ser_context&)> pred_;
+        basic_staj2_event<CharT> event_;
+
+        staj2_cursor_state state_;
+        typed_array_view data_;
+        jsoncons::span<const size_t> shape_;
+        std::size_t index_;
+    public:
+        basic_staj2_visitor()
+            : pred_(accept), event_(staj2_event_type::null_value),
+              state_(), data_(), shape_(), index_(0)
+        {
+        }
+
+        basic_staj2_visitor(std::function<bool(const basic_staj2_event<CharT>&, const ser_context&)> pred)
+            : pred_(pred), event_(staj2_event_type::null_value),
+              state_(), data_(), shape_(), index_(0)
+        {
+        }
+
+        void reset()
+        {
+            event_ = staj2_event_type::null_value;
+            state_ = {};
+            data_ = {};
+            shape_ = {};
+            index_ = 0;
+        }
+
+        const basic_staj2_event<CharT>& event() const
+        {
+            return event_;
+        }
+
+        bool in_available() const
+        {
+            return state_ != staj2_cursor_state();
+        }
+
+        void send_available(std::error_code& ec)
+        {
+            switch (state_)
+            {
+                case staj2_cursor_state::typed_array:
+                    advance_typed_array(ec);
+                    break;
+                case staj2_cursor_state::multi_dim:
+                case staj2_cursor_state::shape:
+                    advance_multi_dim(ec);
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        bool is_typed_array() const
+        {
+            return data_.type() != typed_array_type();
+        }
+
+        staj2_cursor_state state() const
+        {
+            return state_;
+        }
+
+        void advance_typed_array(std::error_code& ec)
+        {
+            if (is_typed_array())
+            {
+                if (index_ < data_.size())
+                {
+                    switch (data_.type())
+                    {
+                        case typed_array_type::uint8_value:
+                        {
+                            this->uint64_value(data_.data(uint8_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::uint16_value:
+                        {
+                            this->uint64_value(data_.data(uint16_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::uint32_value:
+                        {
+                            this->uint64_value(data_.data(uint32_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::uint64_value:
+                        {
+                            this->uint64_value(data_.data(uint64_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::int8_value:
+                        {
+                            this->int64_value(data_.data(int8_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::int16_value:
+                        {
+                            this->int64_value(data_.data(int16_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::int32_value:
+                        {
+                            this->int64_value(data_.data(int32_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::int64_value:
+                        {
+                            this->int64_value(data_.data(int64_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::half_value:
+                        {
+                            this->half_value(data_.data(half_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::float_value:
+                        {
+                            this->double_value(data_.data(float_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        case typed_array_type::double_value:
+                        {
+                            this->double_value(data_.data(double_array_arg)[index_], semantic_tag::none, ser_context(), ec);
+                            break;
+                        }
+                        default:
+                            break;
+                    }
+                    ++index_;
+                }
+                else
+                {
+                    this->end_array();
+                    state_ = staj2_cursor_state();
+                    data_ = typed_array_view();
+                    index_ = 0;
+                }
+            }
+        }
+
+        void advance_multi_dim(std::error_code& ec)
+        {
+            if (shape_.size() != 0)
+            {
+                if (state_ == staj2_cursor_state::multi_dim)
+                {
+                    this->begin_array(shape_.size(), semantic_tag::none, ser_context(), ec);
+                    state_ = staj2_cursor_state::shape;
+                }
+                else if (index_ < shape_.size())
+                {
+                    this->uint64_value(shape_[index_], semantic_tag::none, ser_context(), ec);
+                    ++index_;
+                }
+                else
+                {
+                    state_ = staj2_cursor_state();
+                    this->end_array(ser_context(), ec);
+                    shape_ = jsoncons::span<const size_t>();
+                    index_ = 0;
+                }
+            }
+        }
+
+        bool dump(basic_json_visitor2<CharT>& visitor, const ser_context& context, std::error_code& ec)
+        {
+            bool more = true;
+            if (is_typed_array())
+            {
+                if (index_ != 0)
+                {
+                    more = staj2_to_saj_event(event(), visitor, context, ec);
+                    while (more && is_typed_array())
+                    {
+                        if (index_ < data_.size())
+                        {
+                            switch (data_.type())
+                            {
+                                case typed_array_type::uint8_value:
+                                {
+                                    more = visitor.uint64_value(data_.data(uint8_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::uint16_value:
+                                {
+                                    more = visitor.uint64_value(data_.data(uint16_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::uint32_value:
+                                {
+                                    more = visitor.uint64_value(data_.data(uint32_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::uint64_value:
+                                {
+                                    more = visitor.uint64_value(data_.data(uint64_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::int8_value:
+                                {
+                                    more = visitor.int64_value(data_.data(int8_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::int16_value:
+                                {
+                                    more = visitor.int64_value(data_.data(int16_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::int32_value:
+                                {
+                                    more = visitor.int64_value(data_.data(int32_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::int64_value:
+                                {
+                                    more = visitor.int64_value(data_.data(int64_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::float_value:
+                                {
+                                    more = visitor.double_value(data_.data(float_array_arg)[index_]);
+                                    break;
+                                }
+                                case typed_array_type::double_value:
+                                {
+                                    more = visitor.double_value(data_.data(double_array_arg)[index_]);
+                                    break;
+                                }
+                                default:
+                                    break;
+                            }
+                            ++index_;
+                        }
+                        else
+                        {
+                            more = visitor.end_array();
+                            state_ = staj2_cursor_state();
+                            data_ = typed_array_view();
+                            index_ = 0;
+                        }
+                    }
+                }
+                else
+                {
+                    switch (data_.type())
+                    {
+                        case typed_array_type::uint8_value:
+                        {
+                            more = visitor.typed_array(data_.data(uint8_array_arg));
+                            break;
+                        }
+                        case typed_array_type::uint16_value:
+                        {
+                            more = visitor.typed_array(data_.data(uint16_array_arg));
+                            break;
+                        }
+                        case typed_array_type::uint32_value:
+                        {
+                            more = visitor.typed_array(data_.data(uint32_array_arg));
+                            break;
+                        }
+                        case typed_array_type::uint64_value:
+                        {
+                            more = visitor.typed_array(data_.data(uint64_array_arg));
+                            break;
+                        }
+                        case typed_array_type::int8_value:
+                        {
+                            more = visitor.typed_array(data_.data(int8_array_arg));
+                            break;
+                        }
+                        case typed_array_type::int16_value:
+                        {
+                            more = visitor.typed_array(data_.data(int16_array_arg));
+                            break;
+                        }
+                        case typed_array_type::int32_value:
+                        {
+                            more = visitor.typed_array(data_.data(int32_array_arg));
+                            break;
+                        }
+                        case typed_array_type::int64_value:
+                        {
+                            more = visitor.typed_array(data_.data(int64_array_arg));
+                            break;
+                        }
+                        case typed_array_type::float_value:
+                        {
+                            more = visitor.typed_array(data_.data(float_array_arg));
+                            break;
+                        }
+                        case typed_array_type::double_value:
+                        {
+                            more = visitor.typed_array(data_.data(double_array_arg));
+                            break;
+                        }
+                        default:
+                            break;
+                    }
+
+                    state_ = staj2_cursor_state();
+                    data_ = typed_array_view();
+                }
+            }
+            else
+            {
+                more = staj2_to_saj_event(event(), visitor, context, ec);
+            }
+            return more;
+        }
+
+    private:
+        static constexpr bool accept(const basic_staj2_event<CharT>&, const ser_context&) 
+        {
+            return true;
+        }
+
+        bool visit_begin_object(semantic_tag tag, const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(staj2_event_type::begin_object, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_begin_object(std::size_t length, semantic_tag tag, const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(staj2_event_type::begin_object, length, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_end_object(const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(staj2_event_type::end_object);
+            return !pred_(event_, context);
+        }
+
+        bool visit_begin_array(semantic_tag tag, const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(staj2_event_type::begin_array, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_begin_array(std::size_t length, semantic_tag tag, const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(staj2_event_type::begin_array, length, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_end_array(const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(staj2_event_type::end_array);
+            return !pred_(event_, context);
+        }
+
+        bool visit_null(semantic_tag tag, const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(staj2_event_type::null_value, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_bool(bool value, semantic_tag tag, const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(value, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_string(const string_view_type& s, semantic_tag tag, const ser_context& context, std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(s, staj2_event_type::string_value, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_byte_string(const byte_string_view& s, 
+                               semantic_tag tag,
+                               const ser_context& context,
+                               std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(s, staj2_event_type::byte_string_value, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_byte_string(const byte_string_view& s, 
+                               uint64_t ext_tag,
+                               const ser_context& context,
+                               std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(s, staj2_event_type::byte_string_value, ext_tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_uint64(uint64_t value, 
+                             semantic_tag tag, 
+                             const ser_context& context,
+                             std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(value, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_int64(int64_t value, 
+                      semantic_tag tag,
+                      const ser_context& context,
+                      std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(value, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_half(uint16_t value, 
+                     semantic_tag tag,
+                     const ser_context& context,
+                     std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(half_arg, value, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_double(double value, 
+                       semantic_tag tag, 
+                       const ser_context& context,
+                       std::error_code&) override
+        {
+            event_ = basic_staj2_event<CharT>(value, tag);
+            return !pred_(event_, context);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const uint8_t>& v, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(v.data(), v.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const uint16_t>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const uint32_t>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const uint64_t>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const int8_t>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const int16_t>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const int32_t>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const int64_t>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(half_arg_t, const jsoncons::span<const uint16_t>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const float>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+
+        bool visit_typed_array(const jsoncons::span<const double>& data, 
+                            semantic_tag tag,
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::typed_array;
+            data_ = typed_array_view(data.data(), data.size());
+            index_ = 0;
+            return this->begin_array(tag, context, ec);
+        }
+    /*
+        bool visit_typed_array(const jsoncons::span<const float128_type>&, 
+                            semantic_tag,
+                            const ser_context&,
+                            std::error_code&) override
+        {
+            return true;
+        }
+    */
+        bool visit_begin_multi_dim(const jsoncons::span<const size_t>& shape,
+                                semantic_tag tag,
+                                const ser_context& context, 
+                                std::error_code& ec) override
+        {
+            state_ = staj2_cursor_state::multi_dim;
+            shape_ = shape;
+            return this->begin_array(2, tag, context, ec);
+        }
+
+        bool visit_end_multi_dim(const ser_context& context,
+                              std::error_code& ec) override
+        {
+            return this->end_array(context, ec);
+        }
+
+        void visit_flush() override
+        {
+        }
+    };
+
+    template<class CharT>
+    bool staj2_to_saj_event(const basic_staj2_event<CharT>& ev,
+                           basic_json_visitor2<CharT>& visitor,
+                           const ser_context& context,
+                           std::error_code& ec)
+    {
+        switch (ev.event_type())
+        {
+            case staj2_event_type::begin_array:
+                return visitor.begin_array(ev.tag(), context);
+            case staj2_event_type::end_array:
+                return visitor.end_array(context);
+            case staj2_event_type::begin_object:
+                return visitor.begin_object(ev.tag(), context, ec);
+            case staj2_event_type::end_object:
+                return visitor.end_object(context, ec);
+            case staj2_event_type::string_value:
+                return visitor.string_value(ev.template get<jsoncons::basic_string_view<CharT>>(), ev.tag(), context);
+            case staj2_event_type::byte_string_value:
+                return visitor.byte_string_value(ev.template get<byte_string_view>(), ev.tag(), context);
+            case staj2_event_type::null_value:
+                return visitor.null_value(ev.tag(), context);
+            case staj2_event_type::bool_value:
+                return visitor.bool_value(ev.template get<bool>(), ev.tag(), context);
+            case staj2_event_type::int64_value:
+                return visitor.int64_value(ev.template get<int64_t>(), ev.tag(), context);
+            case staj2_event_type::uint64_value:
+                return visitor.uint64_value(ev.template get<uint64_t>(), ev.tag(), context);
+            case staj2_event_type::half_value:
+                return visitor.half_value(ev.template get<uint16_t>(), ev.tag(), context);
+            case staj2_event_type::double_value:
+                return visitor.double_value(ev.template get<double>(), ev.tag(), context);
+            default:
+                return false;
+        }
+    }
+
+    // basic_staj2_cursor
+
+    template<class CharT>
+    class basic_staj2_cursor
+    {
+    public:
+        virtual ~basic_staj2_cursor() noexcept = default;
+
+        virtual void array_expected(std::error_code& ec)
+        {
+            if (!(current().event_type() == staj2_event_type::begin_array || current().event_type() == staj2_event_type::byte_string_value))
+            {
+                ec = conv_errc::not_vector;
+            }
+        }
+
+        virtual bool done() const = 0;
+
+        virtual const basic_staj2_event<CharT>& current() const = 0;
+
+        virtual void read_to(basic_json_visitor2<CharT>& visitor) = 0;
+
+        virtual void read_to(basic_json_visitor2<CharT>& visitor,
+                             std::error_code& ec) = 0;
+
+        virtual void next() = 0;
+
+        virtual void next(std::error_code& ec) = 0;
+
+        virtual const ser_context& context() const = 0;
+    };
+
+    template<class CharT>
+    class basic_staj2_filter_view : basic_staj2_cursor<CharT>
+    {
+        basic_staj2_cursor<CharT>* cursor_;
+        std::function<bool(const basic_staj2_event<CharT>&, const ser_context&)> pred_;
+    public:
+        basic_staj2_filter_view(basic_staj2_cursor<CharT>& cursor, 
+                         std::function<bool(const basic_staj2_event<CharT>&, const ser_context&)> pred)
+            : cursor_(std::addressof(cursor)), pred_(pred)
+        {
+            while (!done() && !pred_(current(),context()))
+            {
+                cursor_->next();
+            }
+        }
+
+        bool done() const override
+        {
+            return cursor_->done();
+        }
+
+        const basic_staj2_event<CharT>& current() const override
+        {
+            return cursor_->current();
+        }
+
+        void read_to(basic_json_visitor2<CharT>& visitor) override
+        {
+            cursor_->read_to(visitor);
+        }
+
+        void read_to(basic_json_visitor2<CharT>& visitor,
+                     std::error_code& ec) override
+        {
+            cursor_->read_to(visitor, ec);
+        }
+
+        void next() override
+        {
+            cursor_->next();
+            while (!done() && !pred_(current(),context()))
+            {
+                cursor_->next();
+            }
+        }
+
+        void next(std::error_code& ec) override
+        {
+            cursor_->next(ec);
+            while (!done() && !pred_(current(),context()) && !ec)
+            {
+                cursor_->next(ec);
+            }
+        }
+
+        const ser_context& context() const override
+        {
+            return cursor_->context();
+        }
+
+        friend
+        basic_staj2_filter_view<CharT> operator|(basic_staj2_filter_view& cursor, 
+                                          std::function<bool(const basic_staj2_event<CharT>&, const ser_context&)> pred)
+        {
+            return basic_staj2_filter_view<CharT>(cursor, pred);
+        }
+    };
+
+    using staj2_event = basic_staj2_event<char>;
+    using wstaj2_event = basic_staj2_event<wchar_t>;
+
+    using staj2_cursor = basic_staj2_cursor<char>;
+    using wstaj2_cursor = basic_staj2_cursor<wchar_t>;
+
+    using staj2_filter_view = basic_staj2_filter_view<char>;
+    using wstaj2_filter_view = basic_staj2_filter_view<wchar_t>;
+
+} // namespace jsoncons
+
+#endif
+
-- 
cgit v1.2.3