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/bson/bson_cursor.hpp | 320 ++++++++++++++++++++++++++++++
 1 file changed, 320 insertions(+)
 create mode 100644 include/jsoncons_ext/bson/bson_cursor.hpp

(limited to 'include/jsoncons_ext/bson/bson_cursor.hpp')

diff --git a/include/jsoncons_ext/bson/bson_cursor.hpp b/include/jsoncons_ext/bson/bson_cursor.hpp
new file mode 100644
index 0000000..8baee53
--- /dev/null
+++ b/include/jsoncons_ext/bson/bson_cursor.hpp
@@ -0,0 +1,320 @@
+// 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_BSON_BSON_CURSOR_HPP
+#define JSONCONS_BSON_BSON_CURSOR_HPP
+
+#include <memory> // std::allocator
+#include <string>
+#include <vector>
+#include <stdexcept>
+#include <system_error>
+#include <ios>
+#include <istream> // std::basic_istream
+#include <jsoncons/byte_string.hpp>
+#include <jsoncons/config/jsoncons_config.hpp>
+#include <jsoncons/json_visitor.hpp>
+#include <jsoncons/json_exception.hpp>
+#include <jsoncons/staj_cursor.hpp>
+#include <jsoncons/source.hpp>
+#include <jsoncons_ext/bson/bson_parser.hpp>
+
+namespace jsoncons { 
+namespace bson {
+
+template<class Source=jsoncons::binary_stream_source,class Allocator=std::allocator<char>>
+class basic_bson_cursor : public basic_staj_cursor<char>, private virtual ser_context
+{
+    using super_type = basic_staj_cursor<char>;
+public:
+    using source_type = Source;
+    using char_type = char;
+    using allocator_type = Allocator;
+private:
+    basic_bson_parser<Source,Allocator> parser_;
+    basic_staj_visitor<char_type> cursor_visitor_;
+    bool eof_;
+
+    // Noncopyable and nonmoveable
+    basic_bson_cursor(const basic_bson_cursor&) = delete;
+    basic_bson_cursor& operator=(const basic_bson_cursor&) = delete;
+
+public:
+    using string_view_type = string_view;
+
+    template <class Sourceable>
+    basic_bson_cursor(Sourceable&& source,
+                      const bson_decode_options& options = bson_decode_options(),
+                      const Allocator& alloc = Allocator())
+        : parser_(std::forward<Sourceable>(source), options, alloc), 
+          cursor_visitor_(accept_all),
+          eof_(false)
+    {
+        if (!done())
+        {
+            next();
+        }
+    }
+
+    // Constructors that set parse error codes
+
+    template <class Sourceable>
+    basic_bson_cursor(Sourceable&& source,
+                      std::error_code& ec)
+        : basic_bson_cursor(std::allocator_arg, Allocator(),
+                            std::forward<Sourceable>(source), 
+                            bson_decode_options(), 
+                            ec)
+    {
+    }
+
+    template <class Sourceable>
+    basic_bson_cursor(Sourceable&& source,
+                      const bson_decode_options& options,
+                      std::error_code& ec)
+        : basic_bson_cursor(std::allocator_arg, Allocator(),
+                            std::forward<Sourceable>(source), 
+                            options, 
+                            ec)
+    {
+    }
+
+    template <class Sourceable>
+    basic_bson_cursor(std::allocator_arg_t, const Allocator& alloc, 
+                      Sourceable&& source,
+                      const bson_decode_options& options,
+                      std::error_code& ec)
+       : parser_(std::forward<Sourceable>(source), options, alloc),
+         cursor_visitor_(accept_all),
+         eof_(false)
+    {
+        if (!done())
+        {
+            next(ec);
+        }
+    }
+
+    void reset()
+    {
+        parser_.reset();
+        cursor_visitor_.reset();
+        eof_ = false;
+        if (!done())
+        {
+            next();
+        }
+    }
+
+    template <class Sourceable>
+    void reset(Sourceable&& source)
+    {
+        parser_.reset(std::forward<Sourceable>(source));
+        cursor_visitor_.reset();
+        eof_ = false;
+        if (!done())
+        {
+            next();
+        }
+    }
+
+    void reset(std::error_code& ec)
+    {
+        parser_.reset();
+        cursor_visitor_.reset();
+        eof_ = false;
+        if (!done())
+        {
+            next(ec);
+        }
+    }
+
+    template <class Sourceable>
+    void reset(Sourceable&& source, std::error_code& ec)
+    {
+        parser_.reset(std::forward<Sourceable>(source));
+        cursor_visitor_.reset();
+        eof_ = false;
+        if (!done())
+        {
+            next(ec);
+        }
+    }
+
+    bool done() const override
+    {
+        return parser_.done();
+    }
+
+    void array_expected(std::error_code& ec) override
+    {
+        if (cursor_visitor_.event().event_type() == staj_event_type::begin_object)
+        {
+            parser_.array_expected(cursor_visitor_, ec);
+        }
+        else
+        { 
+            super_type::array_expected(ec);
+        }
+    }
+
+    const staj_event& current() const override
+    {
+        return cursor_visitor_.event();
+    }
+
+    void read_to(basic_json_visitor<char_type>& visitor) override
+    {
+        std::error_code ec;
+        read_to(visitor, ec);
+        if (ec)
+        {
+            JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+        }
+    }
+
+    void read_to(basic_json_visitor<char_type>& visitor,
+                std::error_code& ec) override
+    {
+        if (staj_to_saj_event(cursor_visitor_.event(), visitor, *this, ec))
+        {
+            read_next(visitor, ec);
+        }
+    }
+
+    void next() override
+    {
+        std::error_code ec;
+        next(ec);
+        if (ec)
+        {
+            JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+        }
+    }
+
+    void next(std::error_code& ec) override
+    {
+        read_next(ec);
+    }
+
+    const ser_context& context() const override
+    {
+        return *this;
+    }
+
+    bool eof() const
+    {
+        return eof_;
+    }
+
+    std::size_t line() const override
+    {
+        return parser_.line();
+    }
+
+    std::size_t column() const override
+    {
+        return parser_.column();
+    }
+
+    friend
+    staj_filter_view operator|(basic_bson_cursor& cursor, 
+                               std::function<bool(const staj_event&, const ser_context&)> pred)
+    {
+        return staj_filter_view(cursor, pred);
+    }
+
+#if !defined(JSONCONS_NO_DEPRECATED)
+
+    template <class Sourceable>
+    JSONCONS_DEPRECATED_MSG("Instead, use pipe syntax for filter")
+    basic_bson_cursor(Sourceable&& source,
+                      std::function<bool(const staj_event&, const ser_context&)> filter,
+                      std::error_code& ec)
+       : basic_bson_cursor(std::allocator_arg, Allocator(), 
+                           std::forward<Sourceable>(source), filter, ec)
+    {
+    }
+
+    template <class Sourceable>
+    JSONCONS_DEPRECATED_MSG("Instead, use pipe syntax for filter")
+    basic_bson_cursor(Sourceable&& source,
+                      std::function<bool(const staj_event&, const ser_context&)> filter,
+                      const bson_decode_options& options = bson_decode_options(),
+                      const Allocator& alloc = Allocator())
+       : parser_(std::forward<Sourceable>(source), options, alloc), 
+         cursor_visitor_(filter), 
+         eof_(false)
+    {
+        if (!done())
+        {
+            next();
+        }
+    }
+
+    template <class Sourceable>
+    JSONCONS_DEPRECATED_MSG("Instead, use pipe syntax for filter")
+    basic_bson_cursor(std::allocator_arg_t, const Allocator& alloc, 
+                      Sourceable&& source,
+                      std::function<bool(const staj_event&, const ser_context&)> filter, 
+                      std::error_code& ec)
+       : parser_(std::forward<Sourceable>(source),alloc), 
+         cursor_visitor_(filter),
+         eof_(false)
+    {
+        if (!done())
+        {
+            next(ec);
+        }
+    }
+
+    JSONCONS_DEPRECATED_MSG("Instead, use read_to(basic_json_visitor<char_type>&)")
+    void read(basic_json_visitor<char_type>& visitor)
+    {
+        read_to(visitor);
+    }
+
+    JSONCONS_DEPRECATED_MSG("Instead, use read_to(basic_json_visitor<char_type>&, std::error_code&)")
+    void read(basic_json_visitor<char_type>& visitor,
+                 std::error_code& ec) 
+    {
+        read_to(visitor, ec);
+    }
+#endif
+private:
+    static bool accept_all(const staj_event&, const ser_context&) 
+    {
+        return true;
+    }
+
+    void read_next(std::error_code& ec)
+    {
+        parser_.restart();
+        while (!parser_.stopped())
+        {
+            parser_.parse(cursor_visitor_, ec);
+            if (ec) return;
+        }
+    }
+
+    void read_next(basic_json_visitor<char_type>& visitor, std::error_code& ec)
+    {
+        parser_.restart();
+        while (!parser_.stopped())
+        {
+            parser_.parse(visitor, ec);
+            if (ec) return;
+        }
+    }
+};
+
+using bson_stream_cursor = basic_bson_cursor<jsoncons::binary_stream_source>;
+using bson_bytes_cursor = basic_bson_cursor<jsoncons::bytes_source>;
+
+} // namespace bson
+} // namespace jsoncons
+
+#endif
+
-- 
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