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/json_reader.hpp | 731 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 731 insertions(+)
 create mode 100644 include/jsoncons/json_reader.hpp

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

diff --git a/include/jsoncons/json_reader.hpp b/include/jsoncons/json_reader.hpp
new file mode 100644
index 0000000..eeb351f
--- /dev/null
+++ b/include/jsoncons/json_reader.hpp
@@ -0,0 +1,731 @@
+// Copyright 2015 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_JSON_READER_HPP
+#define JSONCONS_JSON_READER_HPP
+
+#include <memory> // std::allocator
+#include <string>
+#include <vector>
+#include <stdexcept>
+#include <system_error>
+#include <ios>
+#include <utility> // std::move
+#include <jsoncons/source.hpp>
+#include <jsoncons/json_exception.hpp>
+#include <jsoncons/json_visitor.hpp>
+#include <jsoncons/json_parser.hpp>
+#include <jsoncons/source_adaptor.hpp>
+
+namespace jsoncons {
+
+    // utf8_other_json_input_adapter
+
+    template <class CharT>
+    class json_utf8_to_other_visitor_adaptor : public json_visitor
+    {
+    public:
+        using json_visitor::string_view_type;
+    private:
+        basic_default_json_visitor<CharT> default_visitor_;
+        basic_json_visitor<CharT>& other_visitor_;
+        //std::function<bool(json_errc,const ser_context&)> err_handler_;
+
+        // noncopyable and nonmoveable
+        json_utf8_to_other_visitor_adaptor(const json_utf8_to_other_visitor_adaptor<CharT>&) = delete;
+        json_utf8_to_other_visitor_adaptor<CharT>& operator=(const json_utf8_to_other_visitor_adaptor<CharT>&) = delete;
+
+    public:
+        json_utf8_to_other_visitor_adaptor()
+            : other_visitor_(default_visitor_)
+        {
+        }
+
+        json_utf8_to_other_visitor_adaptor(basic_json_visitor<CharT>& other_visitor/*,
+                                              std::function<bool(json_errc,const ser_context&)> err_handler*/)
+            : other_visitor_(other_visitor)/*,
+              err_handler_(err_handler)*/
+        {
+        }
+
+    private:
+
+        void visit_flush() override
+        {
+            other_visitor_.flush();
+        }
+
+        bool visit_begin_object(semantic_tag tag, const ser_context& context, std::error_code& ec) override
+        {
+            return other_visitor_.begin_object(tag, context, ec);
+        }
+
+        bool visit_end_object(const ser_context& context, std::error_code& ec) override
+        {
+            return other_visitor_.end_object(context, ec);
+        }
+
+        bool visit_begin_array(semantic_tag tag, const ser_context& context, std::error_code& ec) override
+        {
+            return other_visitor_.begin_array(tag, context, ec);
+        }
+
+        bool visit_end_array(const ser_context& context, std::error_code& ec) override
+        {
+            return other_visitor_.end_array(context, ec);
+        }
+
+        bool visit_key(const string_view_type& name, const ser_context& context, std::error_code& ec) override
+        {
+            std::basic_string<CharT> target;
+            auto result = unicode_traits::convert(
+                name.data(), name.size(), target, 
+                unicode_traits::conv_flags::strict);
+            if (result.ec != unicode_traits::conv_errc())
+            {
+                JSONCONS_THROW(ser_error(result.ec,context.line(),context.column()));
+            }
+            return other_visitor_.key(target, context, ec);
+        }
+
+        bool visit_string(const string_view_type& value, semantic_tag tag, const ser_context& context, std::error_code& ec) override
+        {
+            std::basic_string<CharT> target;
+            auto result = unicode_traits::convert(
+                value.data(), value.size(), target, 
+                unicode_traits::conv_flags::strict);
+            if (result.ec != unicode_traits::conv_errc())
+            {
+                ec = result.ec;
+                return false;
+            }
+            return other_visitor_.string_value(target, tag, context, ec);
+        }
+
+        bool visit_int64(int64_t value, 
+                            semantic_tag tag, 
+                            const ser_context& context,
+                            std::error_code& ec) override
+        {
+            return other_visitor_.int64_value(value, tag, context, ec);
+        }
+
+        bool visit_uint64(uint64_t value, 
+                             semantic_tag tag, 
+                             const ser_context& context,
+                             std::error_code& ec) override
+        {
+            return other_visitor_.uint64_value(value, tag, context, ec);
+        }
+
+        bool visit_half(uint16_t value, 
+                           semantic_tag tag,
+                           const ser_context& context,
+                           std::error_code& ec) override
+        {
+            return other_visitor_.half_value(value, tag, context, ec);
+        }
+
+        bool visit_double(double value, 
+                             semantic_tag tag,
+                             const ser_context& context,
+                             std::error_code& ec) override
+        {
+            return other_visitor_.double_value(value, tag, context, ec);
+        }
+
+        bool visit_bool(bool value, semantic_tag tag, const ser_context& context, std::error_code& ec) override
+        {
+            return other_visitor_.bool_value(value, tag, context, ec);
+        }
+
+        bool visit_null(semantic_tag tag, const ser_context& context, std::error_code& ec) override
+        {
+            return other_visitor_.null_value(tag, context, ec);
+        }
+    };
+
+    template<class CharT,class Source=jsoncons::stream_source<CharT>,class Allocator=std::allocator<char>>
+    class basic_json_reader 
+    {
+    public:
+        using char_type = CharT;
+        using source_type = Source;
+        using string_view_type = jsoncons::basic_string_view<CharT>;
+    private:
+        typedef typename std::allocator_traits<Allocator>:: template rebind_alloc<CharT> char_allocator_type;
+
+        static constexpr size_t default_max_buffer_size = 16384;
+
+        json_source_adaptor<Source> source_;
+        basic_default_json_visitor<CharT> default_visitor_;
+        basic_json_visitor<CharT>& visitor_;
+        basic_json_parser<CharT,Allocator> parser_;
+
+        // Noncopyable and nonmoveable
+        basic_json_reader(const basic_json_reader&) = delete;
+        basic_json_reader& operator=(const basic_json_reader&) = delete;
+
+    public:
+        template <class Sourceable>
+        explicit basic_json_reader(Sourceable&& source, const Allocator& alloc = Allocator())
+            : basic_json_reader(std::forward<Sourceable>(source),
+                                default_visitor_,
+                                basic_json_decode_options<CharT>(),
+                                default_json_parsing(),
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_json_reader(Sourceable&& source, 
+                          const basic_json_decode_options<CharT>& options, 
+                          const Allocator& alloc = Allocator())
+            : basic_json_reader(std::forward<Sourceable>(source),
+                                default_visitor_,
+                                options,
+                                default_json_parsing(),
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_json_reader(Sourceable&& source,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator())
+            : basic_json_reader(std::forward<Sourceable>(source),
+                                default_visitor_,
+                                basic_json_decode_options<CharT>(),
+                                err_handler,
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_json_reader(Sourceable&& source, 
+                          const basic_json_decode_options<CharT>& options,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator())
+            : basic_json_reader(std::forward<Sourceable>(source),
+                                default_visitor_,
+                                options,
+                                err_handler,
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_json_reader(Sourceable&& source, 
+                          basic_json_visitor<CharT>& visitor, 
+                          const Allocator& alloc = Allocator())
+            : basic_json_reader(std::forward<Sourceable>(source),
+                                visitor,
+                                basic_json_decode_options<CharT>(),
+                                default_json_parsing(),
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_json_reader(Sourceable&& source, 
+                          basic_json_visitor<CharT>& visitor,
+                          const basic_json_decode_options<CharT>& options, 
+                          const Allocator& alloc = Allocator())
+            : basic_json_reader(std::forward<Sourceable>(source),
+                                visitor,
+                                options,
+                                default_json_parsing(),
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_json_reader(Sourceable&& source,
+                          basic_json_visitor<CharT>& visitor,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator())
+            : basic_json_reader(std::forward<Sourceable>(source),
+                                visitor,
+                                basic_json_decode_options<CharT>(),
+                                err_handler,
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_json_reader(Sourceable&& source,
+                          basic_json_visitor<CharT>& visitor, 
+                          const basic_json_decode_options<CharT>& options,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator())
+           : source_(std::forward<Sourceable>(source)),
+             visitor_(visitor),
+             parser_(options,err_handler,alloc)
+        {
+        }
+
+#if !defined(JSONCONS_NO_DEPRECATED)
+        JSONCONS_DEPRECATED_MSG("Instead, use max_nesting_depth() on options")
+        int max_nesting_depth() const
+        {
+            return parser_.max_nesting_depth();
+        }
+
+        JSONCONS_DEPRECATED_MSG("Instead, use max_nesting_depth(int) on options")
+        void max_nesting_depth(int depth)
+        {
+            parser_.max_nesting_depth(depth);
+        }
+#endif
+        void read_next()
+        {
+            std::error_code ec;
+            read_next(ec);
+            if (ec)
+            {
+                JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+            }
+        }
+
+        void read_next(std::error_code& ec)
+        {
+            if (source_.is_error())
+            {
+                ec = json_errc::source_error;
+                return;
+            }        
+            parser_.reset();
+            while (!parser_.stopped())
+            {
+                if (parser_.source_exhausted())
+                {
+                    auto s = source_.read_buffer(ec);
+                    if (ec) return;
+                    if (s.size() > 0)
+                    {
+                        parser_.update(s.data(),s.size());
+                    }
+                }
+                bool eof = parser_.source_exhausted();
+                parser_.parse_some(visitor_, ec);
+                if (ec) return;
+                if (eof)
+                {
+                    if (parser_.enter())
+                    {
+                        break;
+                    }
+                    else if (!parser_.accept())
+                    {
+                        ec = json_errc::unexpected_eof;
+                        return;
+                    }
+                }
+            }
+            
+            while (!source_.eof())
+            {
+                parser_.skip_whitespace();
+                if (parser_.source_exhausted())
+                {
+                    auto s = source_.read_buffer(ec);
+                    if (ec) return;
+                    if (s.size() > 0)
+                    {
+                        parser_.update(s.data(),s.size());
+                    }
+                }
+                else
+                {
+                    break;
+                }
+            }
+        }
+
+        void check_done()
+        {
+            std::error_code ec;
+            check_done(ec);
+            if (ec)
+            {
+                JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+            }
+        }
+
+        std::size_t line() const
+        {
+            return parser_.line();
+        }
+
+        std::size_t column() const
+        {
+            return parser_.column();
+        }
+
+        void check_done(std::error_code& ec)
+        {
+            if (source_.is_error())
+            {
+                ec = json_errc::source_error;
+                return;
+            }   
+            if (source_.eof())
+            {
+                parser_.check_done(ec);
+                if (ec) return;
+            }
+            else
+            {
+                do
+                {
+                    if (parser_.source_exhausted())
+                    {
+                        auto s = source_.read_buffer(ec);
+                        if (ec) return;
+                        if (s.size() > 0)
+                        {
+                            parser_.update(s.data(),s.size());
+                        }
+                    }
+                    if (!parser_.source_exhausted())
+                    {
+                        parser_.check_done(ec);
+                        if (ec) return;
+                    }
+                }
+                while (!eof());
+            }
+        }
+
+        bool eof() const
+        {
+            return parser_.source_exhausted() && source_.eof();
+        }
+
+        void read()
+        {
+            read_next();
+            check_done();
+        }
+
+        void read(std::error_code& ec)
+        {
+            read_next(ec);
+            if (!ec)
+            {
+                check_done(ec);
+            }
+        }
+    };
+
+    template<class CharT,class Source=jsoncons::stream_source<CharT>,class Allocator=std::allocator<char>>
+    class legacy_basic_json_reader 
+    {
+    public:
+        using char_type = CharT;
+        using source_type = Source;
+        using string_view_type = jsoncons::basic_string_view<CharT>;
+    private:
+        typedef typename std::allocator_traits<Allocator>:: template rebind_alloc<CharT> char_allocator_type;
+
+        static constexpr size_t default_max_buffer_size = 16384;
+
+        json_source_adaptor<Source> source_;
+        basic_default_json_visitor<CharT> default_visitor_;
+        basic_json_visitor<CharT>& visitor_;
+        basic_json_parser<CharT,Allocator> parser_;
+
+        // Noncopyable and nonmoveable
+        legacy_basic_json_reader(const legacy_basic_json_reader&) = delete;
+        legacy_basic_json_reader& operator=(const legacy_basic_json_reader&) = delete;
+
+    public:
+        template <class Sourceable>
+        explicit legacy_basic_json_reader(Sourceable&& source, const Allocator& alloc = Allocator())
+            : legacy_basic_json_reader(std::forward<Sourceable>(source),
+                                default_visitor_,
+                                basic_json_decode_options<CharT>(),
+                                default_json_parsing(),
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_json_reader(Sourceable&& source, 
+                          const basic_json_decode_options<CharT>& options, 
+                          const Allocator& alloc = Allocator())
+            : legacy_basic_json_reader(std::forward<Sourceable>(source),
+                                default_visitor_,
+                                options,
+                                default_json_parsing(),
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_json_reader(Sourceable&& source,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator())
+            : legacy_basic_json_reader(std::forward<Sourceable>(source),
+                                default_visitor_,
+                                basic_json_decode_options<CharT>(),
+                                err_handler,
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_json_reader(Sourceable&& source, 
+                          const basic_json_decode_options<CharT>& options,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator())
+            : legacy_basic_json_reader(std::forward<Sourceable>(source),
+                                default_visitor_,
+                                options,
+                                err_handler,
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_json_reader(Sourceable&& source, 
+                          basic_json_visitor<CharT>& visitor, 
+                          const Allocator& alloc = Allocator())
+            : legacy_basic_json_reader(std::forward<Sourceable>(source),
+                                visitor,
+                                basic_json_decode_options<CharT>(),
+                                default_json_parsing(),
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_json_reader(Sourceable&& source, 
+                          basic_json_visitor<CharT>& visitor,
+                          const basic_json_decode_options<CharT>& options, 
+                          const Allocator& alloc = Allocator())
+            : legacy_basic_json_reader(std::forward<Sourceable>(source),
+                                visitor,
+                                options,
+                                default_json_parsing(),
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_json_reader(Sourceable&& source,
+                          basic_json_visitor<CharT>& visitor,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator())
+            : legacy_basic_json_reader(std::forward<Sourceable>(source),
+                                visitor,
+                                basic_json_decode_options<CharT>(),
+                                err_handler,
+                                alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_json_reader(Sourceable&& source,
+                          basic_json_visitor<CharT>& visitor, 
+                          const basic_json_decode_options<CharT>& options,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator(),
+                          typename std::enable_if<!std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type* = 0)
+           : source_(std::forward<Sourceable>(source)),
+             visitor_(visitor),
+             parser_(options,err_handler,alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_json_reader(Sourceable&& source,
+                          basic_json_visitor<CharT>& visitor, 
+                          const basic_json_decode_options<CharT>& options,
+                          std::function<bool(json_errc,const ser_context&)> err_handler, 
+                          const Allocator& alloc = Allocator(),
+                          typename std::enable_if<std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type* = 0)
+           : source_(),
+             visitor_(visitor),
+             parser_(options,err_handler,alloc)
+        {
+            jsoncons::basic_string_view<CharT> sv(std::forward<Sourceable>(source));
+
+            auto r = unicode_traits::detect_json_encoding(sv.data(), sv.size());
+            if (!(r.encoding == unicode_traits::encoding_kind::utf8 || r.encoding == unicode_traits::encoding_kind::undetected))
+            {
+                JSONCONS_THROW(ser_error(json_errc::illegal_unicode_character,parser_.line(),parser_.column()));
+            }
+            std::size_t offset = (r.ptr - sv.data());
+            parser_.update(sv.data()+offset,sv.size()-offset);
+        }
+
+#if !defined(JSONCONS_NO_DEPRECATED)
+        JSONCONS_DEPRECATED_MSG("Instead, use max_nesting_depth() on options")
+        int max_nesting_depth() const
+        {
+            return parser_.max_nesting_depth();
+        }
+
+        JSONCONS_DEPRECATED_MSG("Instead, use max_nesting_depth(int) on options")
+        void max_nesting_depth(int depth)
+        {
+            parser_.max_nesting_depth(depth);
+        }
+#endif
+        void read_next()
+        {
+            std::error_code ec;
+            read_next(ec);
+            if (ec)
+            {
+                JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+            }
+        }
+
+        void read_next(std::error_code& ec)
+        {
+            if (source_.is_error())
+            {
+                ec = json_errc::source_error;
+                return;
+            }        
+            parser_.reset();
+            while (!parser_.stopped())
+            {
+                if (parser_.source_exhausted())
+                {
+                    auto s = source_.read_buffer(ec);
+                    if (ec) return;
+                    if (s.size() > 0)
+                    {
+                        parser_.update(s.data(),s.size());
+                    }
+                }
+                bool eof = parser_.source_exhausted();
+                parser_.parse_some(visitor_, ec);
+                if (ec) return;
+                if (eof)
+                {
+                    if (parser_.enter())
+                    {
+                        break;
+                    }
+                    else if (!parser_.accept())
+                    {
+                        ec = json_errc::unexpected_eof;
+                        return;
+                    }
+                }
+            }
+            
+            while (!source_.eof())
+            {
+                parser_.skip_whitespace();
+                if (parser_.source_exhausted())
+                {
+                    auto s = source_.read_buffer(ec);
+                    if (ec) return;
+                    if (s.size() > 0)
+                    {
+                        parser_.update(s.data(),s.size());
+                    }
+                }
+                else
+                {
+                    break;
+                }
+            }
+        }
+
+        void check_done()
+        {
+            std::error_code ec;
+            check_done(ec);
+            if (ec)
+            {
+                JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+            }
+        }
+
+        std::size_t line() const
+        {
+            return parser_.line();
+        }
+
+        std::size_t column() const
+        {
+            return parser_.column();
+        }
+
+        void check_done(std::error_code& ec)
+        {
+            if (source_.is_error())
+            {
+                ec = json_errc::source_error;
+                return;
+            }   
+            if (source_.eof())
+            {
+                parser_.check_done(ec);
+                if (ec) return;
+            }
+            else
+            {
+                do
+                {
+                    if (parser_.source_exhausted())
+                    {
+                        auto s = source_.read_buffer(ec);
+                        if (ec) return;
+                        if (s.size() > 0)
+                        {
+                            parser_.update(s.data(),s.size());
+                        }
+                    }
+                    if (!parser_.source_exhausted())
+                    {
+                        parser_.check_done(ec);
+                        if (ec) return;
+                    }
+                }
+                while (!eof());
+            }
+        }
+
+        bool eof() const
+        {
+            return parser_.source_exhausted() && source_.eof();
+        }
+
+        void read()
+        {
+            read_next();
+            check_done();
+        }
+
+        void read(std::error_code& ec)
+        {
+            read_next(ec);
+            if (!ec)
+            {
+                check_done(ec);
+            }
+        }
+    };
+
+#if !defined(JSONCONS_NO_DEPRECATED)
+    using json_reader = legacy_basic_json_reader<char>;
+    using wjson_reader = legacy_basic_json_reader<wchar_t>;
+#endif
+    using json_string_reader = basic_json_reader<char,string_source<char>>;
+    using wjson_string_reader = basic_json_reader<wchar_t,string_source<wchar_t>>;
+    using json_stream_reader = basic_json_reader<char,stream_source<char>>;
+    using wjson_stream_reader = basic_json_reader<wchar_t,stream_source<wchar_t>>;
+}
+
+#endif
+
-- 
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