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_ext/csv/csv_reader.hpp | 348 ++++++++++++++++++++++++++++++++
 1 file changed, 348 insertions(+)
 create mode 100644 include/jsoncons_ext/csv/csv_reader.hpp

(limited to 'include/jsoncons_ext/csv/csv_reader.hpp')

diff --git a/include/jsoncons_ext/csv/csv_reader.hpp b/include/jsoncons_ext/csv/csv_reader.hpp
new file mode 100644
index 0000000..f10211a
--- /dev/null
+++ b/include/jsoncons_ext/csv/csv_reader.hpp
@@ -0,0 +1,348 @@
+// Copyright 2013 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_CSV_CSV_READER_HPP
+#define JSONCONS_CSV_CSV_READER_HPP
+
+#include <string>
+#include <vector>
+#include <stdexcept>
+#include <memory> // std::allocator
+#include <utility> // std::move
+#include <istream> // std::basic_istream
+#include <jsoncons/source.hpp>
+#include <jsoncons/json_exception.hpp>
+#include <jsoncons/json_visitor.hpp>
+#include <jsoncons_ext/csv/csv_error.hpp>
+#include <jsoncons_ext/csv/csv_parser.hpp>
+#include <jsoncons/json.hpp>
+#include <jsoncons/json_reader.hpp>
+#include <jsoncons/json_decoder.hpp>
+#include <jsoncons/source_adaptor.hpp>
+#include <jsoncons_ext/csv/csv_options.hpp>
+
+namespace jsoncons { namespace csv {
+
+    template<class CharT,class Source=jsoncons::stream_source<CharT>,class Allocator=std::allocator<char>>
+    class basic_csv_reader 
+    {
+        struct stack_item
+        {
+            stack_item() noexcept
+               : array_begun_(false)
+            {
+            }
+
+            bool array_begun_;
+        };
+        using char_type = CharT;
+        using temp_allocator_type = Allocator;
+        typedef typename std::allocator_traits<temp_allocator_type>:: template rebind_alloc<CharT> char_allocator_type;
+
+        basic_csv_reader(const basic_csv_reader&) = delete; 
+        basic_csv_reader& operator = (const basic_csv_reader&) = delete; 
+
+        basic_default_json_visitor<CharT> default_visitor_;
+        text_source_adaptor<Source> source_;
+        basic_json_visitor<CharT>& visitor_;
+        basic_csv_parser<CharT,Allocator> parser_;
+
+    public:
+        // Structural characters
+        static constexpr size_t default_max_buffer_size = 16384;
+        //!  Parse an input stream of CSV text into a json object
+        /*!
+          \param is The input stream to read from
+        */
+
+        template <class Sourceable>
+        basic_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor, 
+                         const Allocator& alloc = Allocator())
+
+           : basic_csv_reader(std::forward<Sourceable>(source), 
+                              visitor, 
+                              basic_csv_decode_options<CharT>(), 
+                              default_csv_parsing(), 
+                              alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor,
+                         const basic_csv_decode_options<CharT>& options, 
+                         const Allocator& alloc = Allocator())
+
+            : basic_csv_reader(std::forward<Sourceable>(source), 
+                               visitor, 
+                               options, 
+                               default_csv_parsing(),
+                               alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor,
+                         std::function<bool(csv_errc,const ser_context&)> err_handler, 
+                         const Allocator& alloc = Allocator())
+            : basic_csv_reader(std::forward<Sourceable>(source), 
+                               visitor, 
+                               basic_csv_decode_options<CharT>(), 
+                               err_handler,
+                               alloc)
+        {
+        }
+
+        template <class Sourceable>
+        basic_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor,
+                         const basic_csv_decode_options<CharT>& options,
+                         std::function<bool(csv_errc,const ser_context&)> err_handler, 
+                         const Allocator& alloc = Allocator())
+           : source_(std::forward<Sourceable>(source)),
+             visitor_(visitor),
+             parser_(options, err_handler, alloc)
+             
+        {
+        }
+
+        ~basic_csv_reader() noexcept = default;
+
+        void read()
+        {
+            std::error_code ec;
+            read(ec);
+            if (ec)
+            {
+                JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+            }
+        }
+
+        void read(std::error_code& ec)
+        {
+            read_internal(ec);
+        }
+
+        std::size_t line() const
+        {
+            return parser_.line();
+        }
+
+        std::size_t column() const
+        {
+            return parser_.column();
+        }
+
+        bool eof() const
+        {
+            return parser_.source_exhausted() && source_.eof();
+        }
+
+    private:
+
+        void read_internal(std::error_code& ec)
+        {
+            if (source_.is_error())
+            {
+                ec = csv_errc::source_error;
+                return;
+            }   
+            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());
+                    }
+                }
+                parser_.parse_some(visitor_, ec);
+                if (ec) return;
+            }
+        }
+    };
+
+    template<class CharT,class Source=jsoncons::stream_source<CharT>,class Allocator=std::allocator<char>>
+    class legacy_basic_csv_reader 
+    {
+        struct stack_item
+        {
+            stack_item() noexcept
+               : array_begun_(false)
+            {
+            }
+
+            bool array_begun_;
+        };
+        using char_type = CharT;
+        using temp_allocator_type = Allocator;
+        typedef typename std::allocator_traits<temp_allocator_type>:: template rebind_alloc<CharT> char_allocator_type;
+
+        legacy_basic_csv_reader(const legacy_basic_csv_reader&) = delete; 
+        legacy_basic_csv_reader& operator = (const legacy_basic_csv_reader&) = delete; 
+
+        basic_default_json_visitor<CharT> default_visitor_;
+        text_source_adaptor<Source> source_;
+        basic_json_visitor<CharT>& visitor_;
+        basic_csv_parser<CharT,Allocator> parser_;
+
+    public:
+        // Structural characters
+        static constexpr size_t default_max_buffer_size = 16384;
+        //!  Parse an input stream of CSV text into a json object
+        /*!
+          \param is The input stream to read from
+        */
+
+        template <class Sourceable>
+        legacy_basic_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor, 
+                         const Allocator& alloc = Allocator())
+
+           : legacy_basic_csv_reader(std::forward<Sourceable>(source), 
+                              visitor, 
+                              basic_csv_decode_options<CharT>(), 
+                              default_csv_parsing(), 
+                              alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor,
+                         const basic_csv_decode_options<CharT>& options, 
+                         const Allocator& alloc = Allocator())
+
+            : legacy_basic_csv_reader(std::forward<Sourceable>(source), 
+                               visitor, 
+                               options, 
+                               default_csv_parsing(),
+                               alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor,
+                         std::function<bool(csv_errc,const ser_context&)> err_handler, 
+                         const Allocator& alloc = Allocator())
+            : legacy_basic_csv_reader(std::forward<Sourceable>(source), 
+                               visitor, 
+                               basic_csv_decode_options<CharT>(), 
+                               err_handler,
+                               alloc)
+        {
+        }
+
+        template <class Sourceable>
+        legacy_basic_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor,
+                         const basic_csv_decode_options<CharT>& options,
+                         std::function<bool(csv_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_csv_reader(Sourceable&& source,
+                         basic_json_visitor<CharT>& visitor,
+                         const basic_csv_decode_options<CharT>& options,
+                         std::function<bool(csv_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_encoding_from_bom(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);
+        }
+
+        ~legacy_basic_csv_reader() noexcept = default;
+
+        void read()
+        {
+            std::error_code ec;
+            read(ec);
+            if (ec)
+            {
+                JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+            }
+        }
+
+        void read(std::error_code& ec)
+        {
+            read_internal(ec);
+        }
+
+        std::size_t line() const
+        {
+            return parser_.line();
+        }
+
+        std::size_t column() const
+        {
+            return parser_.column();
+        }
+
+        bool eof() const
+        {
+            return parser_.source_exhausted() && source_.eof();
+        }
+
+    private:
+
+        void read_internal(std::error_code& ec)
+        {
+            if (source_.is_error())
+            {
+                ec = csv_errc::source_error;
+                return;
+            }   
+            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());
+                    }
+                }
+                parser_.parse_some(visitor_, ec);
+                if (ec) return;
+            }
+        }
+    };
+
+#if !defined(JSONCONS_NO_DEPRECATED)
+    using csv_reader = legacy_basic_csv_reader<char>;
+    using wcsv_reader = legacy_basic_csv_reader<wchar_t>;
+#endif
+
+    using csv_string_reader = basic_csv_reader<char,string_source<char>>;
+    using wcsv_string_reader = basic_csv_reader<wchar_t,string_source<wchar_t>>;
+    using csv_stream_reader = basic_csv_reader<char,stream_source<char>>;
+    using wcsv_stream_reader = basic_csv_reader<wchar_t,stream_source<wchar_t>>;
+
+}}
+
+#endif
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