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authorRichard <q@1bpm.net>2022-09-04 00:32:56 +0100
committerRichard <q@1bpm.net>2022-09-04 00:32:56 +0100
commit1d055261b4144dbf86b2658437015b15d4dd9bff (patch)
tree6049b19d1bf953a650383de1a5e438b8b82679f6 /include/jsoncons/json_cursor.hpp
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diff --git a/include/jsoncons/json_cursor.hpp b/include/jsoncons/json_cursor.hpp
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+// 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_JSON_CURSOR_HPP
+#define JSONCONS_JSON_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/json_parser.hpp>
+#include <jsoncons/staj_cursor.hpp>
+#include <jsoncons/source.hpp>
+#include <jsoncons/source_adaptor.hpp>
+
+namespace jsoncons {
+
+template<class CharT,class Source=jsoncons::stream_source<CharT>,class Allocator=std::allocator<char>>
+class basic_json_cursor : public basic_staj_cursor<CharT>, private virtual ser_context
+{
+public:
+ using source_type = Source;
+ using char_type = CharT;
+ using allocator_type = Allocator;
+ using string_view_type = jsoncons::basic_string_view<CharT>;
+private:
+ typedef typename std::allocator_traits<allocator_type>:: template rebind_alloc<CharT> char_allocator_type;
+ static constexpr size_t default_max_buffer_size = 16384;
+
+ json_source_adaptor<Source> source_;
+ basic_json_parser<CharT,Allocator> parser_;
+ basic_staj_visitor<CharT> cursor_visitor_;
+ bool done_;
+
+ // Noncopyable and nonmoveable
+ basic_json_cursor(const basic_json_cursor&) = delete;
+ basic_json_cursor& operator=(const basic_json_cursor&) = delete;
+
+public:
+
+ // Constructors that throw parse exceptions
+
+ template <class Sourceable>
+ basic_json_cursor(Sourceable&& source,
+ const basic_json_decode_options<CharT>& options = basic_json_decode_options<CharT>(),
+ std::function<bool(json_errc,const ser_context&)> err_handler = default_json_parsing(),
+ 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)),
+ parser_(options,err_handler,alloc),
+ cursor_visitor_(accept_all),
+ done_(false)
+ {
+ if (!done())
+ {
+ next();
+ }
+ }
+
+ template <class Sourceable>
+ basic_json_cursor(Sourceable&& source,
+ const basic_json_decode_options<CharT>& options = basic_json_decode_options<CharT>(),
+ std::function<bool(json_errc,const ser_context&)> err_handler = default_json_parsing(),
+ const Allocator& alloc = Allocator(),
+ typename std::enable_if<std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type* = 0)
+ : source_(),
+ parser_(options, err_handler, alloc),
+ cursor_visitor_(accept_all),
+ done_(false)
+ {
+ initialize_with_string_view(std::forward<Sourceable>(source));
+ }
+
+
+ // Constructors that set parse error codes
+ template <class Sourceable>
+ basic_json_cursor(Sourceable&& source,
+ std::error_code& ec)
+ : basic_json_cursor(std::allocator_arg, Allocator(),
+ std::forward<Sourceable>(source),
+ basic_json_decode_options<CharT>(),
+ default_json_parsing(),
+ ec)
+ {
+ }
+
+ template <class Sourceable>
+ basic_json_cursor(Sourceable&& source,
+ const basic_json_decode_options<CharT>& options,
+ std::error_code& ec)
+ : basic_json_cursor(std::allocator_arg, Allocator(),
+ std::forward<Sourceable>(source),
+ options,
+ default_json_parsing(),
+ ec)
+ {
+ }
+
+ template <class Sourceable>
+ basic_json_cursor(Sourceable&& source,
+ const basic_json_decode_options<CharT>& options,
+ std::function<bool(json_errc,const ser_context&)> err_handler,
+ std::error_code& ec)
+ : basic_json_cursor(std::allocator_arg, Allocator(),
+ std::forward<Sourceable>(source),
+ options,
+ err_handler,
+ ec)
+ {
+ }
+
+ template <class Sourceable>
+ basic_json_cursor(std::allocator_arg_t, const Allocator& alloc,
+ Sourceable&& source,
+ const basic_json_decode_options<CharT>& options,
+ std::function<bool(json_errc,const ser_context&)> err_handler,
+ std::error_code& ec,
+ typename std::enable_if<!std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type* = 0)
+ : source_(std::forward<Sourceable>(source)),
+ parser_(options,err_handler,alloc),
+ cursor_visitor_(accept_all),
+ done_(false)
+ {
+ if (!done())
+ {
+ next(ec);
+ }
+ }
+
+ template <class Sourceable>
+ basic_json_cursor(std::allocator_arg_t, const Allocator& alloc,
+ Sourceable&& source,
+ const basic_json_decode_options<CharT>& options,
+ std::function<bool(json_errc,const ser_context&)> err_handler,
+ std::error_code& ec,
+ typename std::enable_if<std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type* = 0)
+ : source_(),
+ parser_(options, err_handler, alloc),
+ cursor_visitor_(accept_all),
+ done_(false)
+ {
+ initialize_with_string_view(std::forward<Sourceable>(source), ec);
+ }
+
+ void reset()
+ {
+ parser_.reset();
+ cursor_visitor_.reset();
+ done_ = false;
+ if (!done())
+ {
+ next();
+ }
+ }
+
+ template <class Sourceable>
+ typename std::enable_if<!std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type
+ reset(Sourceable&& source)
+ {
+ source_ = std::forward<Sourceable>(source);
+ parser_.reinitialize();
+ cursor_visitor_.reset();
+ done_ = false;
+ if (!done())
+ {
+ next();
+ }
+ }
+
+ template <class Sourceable>
+ typename std::enable_if<std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type
+ reset(Sourceable&& source)
+ {
+ source_ = {};
+ parser_.reinitialize();
+ cursor_visitor_.reset();
+ done_ = false;
+ initialize_with_string_view(std::forward<Sourceable>(source));
+ }
+
+ void reset(std::error_code& ec)
+ {
+ parser_.reset();
+ cursor_visitor_.reset();
+ done_ = false;
+ if (!done())
+ {
+ next(ec);
+ }
+ }
+
+ template <class Sourceable>
+ typename std::enable_if<!std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type
+ reset(Sourceable&& source, std::error_code& ec)
+ {
+ source_ = std::forward<Sourceable>(source);
+ parser_.reinitialize();
+ cursor_visitor_.reset();
+ done_ = false;
+ if (!done())
+ {
+ next(ec);
+ }
+ }
+
+ template <class Sourceable>
+ typename std::enable_if<std::is_constructible<jsoncons::basic_string_view<CharT>,Sourceable>::value>::type
+ reset(Sourceable&& source, std::error_code& ec)
+ {
+ source_ = {};
+ parser_.reinitialize();
+ done_ = false;
+ initialize_with_string_view(std::forward<Sourceable>(source), ec);
+ }
+
+ bool done() const override
+ {
+ return parser_.done() || done_;
+ }
+
+ const basic_staj_event<CharT>& current() const override
+ {
+ return cursor_visitor_.event();
+ }
+
+ void read_to(basic_json_visitor<CharT>& 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<CharT>& 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);
+ }
+
+ void check_done()
+ {
+ std::error_code ec;
+ check_done(ec);
+ if (ec)
+ {
+ JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
+ }
+ }
+
+ const ser_context& context() const override
+ {
+ return *this;
+ }
+
+ 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();
+ }
+
+ std::size_t line() const override
+ {
+ return parser_.line();
+ }
+
+ std::size_t column() const override
+ {
+ return parser_.column();
+ }
+
+ friend
+ basic_staj_filter_view<CharT> operator|(basic_json_cursor& cursor,
+ std::function<bool(const basic_staj_event<CharT>&, const ser_context&)> pred)
+ {
+ return basic_staj_filter_view<CharT>(cursor, pred);
+ }
+
+private:
+
+ static bool accept_all(const basic_staj_event<CharT>&, const ser_context&)
+ {
+ return true;
+ }
+
+ void initialize_with_string_view(string_view_type sv)
+ {
+ 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 (!done())
+ {
+ next();
+ }
+ }
+
+ void initialize_with_string_view(string_view_type sv, std::error_code& ec)
+ {
+ 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))
+ {
+ ec = json_errc::illegal_unicode_character;
+ return;
+ }
+ std::size_t offset = (r.ptr - sv.data());
+ parser_.update(sv.data()+offset,sv.size()-offset);
+ if (!done())
+ {
+ next(ec);
+ }
+ }
+
+ void read_next(std::error_code& ec)
+ {
+ read_next(cursor_visitor_, ec);
+ }
+
+ void read_next(basic_json_visitor<CharT>& visitor, std::error_code& ec)
+ {
+ parser_.restart();
+ 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());
+ if (ec) return;
+ }
+ }
+ bool eof = parser_.source_exhausted() && source_.eof();
+ parser_.parse_some(visitor, ec);
+ if (ec) return;
+ if (eof)
+ {
+ if (parser_.enter())
+ {
+ done_ = true;
+ break;
+ }
+ else if (!parser_.accept())
+ {
+ ec = json_errc::unexpected_eof;
+ return;
+ }
+ }
+ }
+ }
+};
+
+using json_stream_cursor = basic_json_cursor<char,jsoncons::stream_source<char>>;
+using json_string_cursor = basic_json_cursor<char,jsoncons::string_source<char>>;
+using wjson_stream_cursor = basic_json_cursor<wchar_t,jsoncons::stream_source<wchar_t>>;
+using wjson_string_cursor = basic_json_cursor<wchar_t,jsoncons::string_source<wchar_t>>;
+
+using json_cursor = basic_json_cursor<char>;
+using wjson_cursor = basic_json_cursor<wchar_t>;
+
+#if !defined(JSONCONS_NO_DEPRECATED)
+template<class CharT,class Source,class Allocator=std::allocator<CharT>>
+using basic_json_pull_reader = basic_json_cursor<CharT,Source,Allocator>;
+
+JSONCONS_DEPRECATED_MSG("Instead, use json_cursor") typedef json_cursor json_pull_reader;
+JSONCONS_DEPRECATED_MSG("Instead, use wjson_cursor") typedef wjson_cursor wjson_pull_reader;
+
+template<class CharT,class Source,class Allocator=std::allocator<CharT>>
+using basic_json_stream_reader = basic_json_cursor<CharT,Source,Allocator>;
+
+template<class CharT,class Source,class Allocator=std::allocator<CharT>>
+using basic_json_staj_cursor = basic_json_cursor<CharT,Source,Allocator>;
+
+JSONCONS_DEPRECATED_MSG("Instead, use json_cursor") typedef json_cursor json_staj_cursor;
+JSONCONS_DEPRECATED_MSG("Instead, use wjson_cursor") typedef wjson_cursor wjson_staj_cursor;
+#endif
+
+}
+
+#endif
+