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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_UBJSON_UBJSON_CURSOR_HPP
#define JSONCONS_UBJSON_UBJSON_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/ubjson/ubjson_parser.hpp>
namespace jsoncons {
namespace ubjson {
template<class Source=jsoncons::binary_stream_source,class Allocator=std::allocator<char>>
class basic_ubjson_cursor : public basic_staj_cursor<char>, private virtual ser_context
{
public:
using source_type = Source;
using char_type = char;
using allocator_type = Allocator;
private:
basic_ubjson_parser<Source,Allocator> parser_;
basic_staj_visitor<char_type> cursor_visitor_;
bool eof_;
// Noncopyable and nonmoveable
basic_ubjson_cursor(const basic_ubjson_cursor&) = delete;
basic_ubjson_cursor& operator=(const basic_ubjson_cursor&) = delete;
public:
using string_view_type = string_view;
template <class Sourceable>
basic_ubjson_cursor(Sourceable&& source,
const ubjson_decode_options& options = ubjson_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_ubjson_cursor(Sourceable&& source,
std::error_code& ec)
: basic_ubjson_cursor(std::allocator_arg, Allocator(),
std::forward<Sourceable>(source),
ubjson_decode_options(),
ec)
{
}
template <class Sourceable>
basic_ubjson_cursor(Sourceable&& source,
const ubjson_decode_options& options,
std::error_code& ec)
: basic_ubjson_cursor(std::allocator_arg, Allocator(),
std::forward<Sourceable>(source),
options,
ec)
{
}
template <class Sourceable>
basic_ubjson_cursor(std::allocator_arg_t, const Allocator& alloc,
Sourceable&& source,
const ubjson_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();
}
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_ubjson_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_ubjson_cursor(Sourceable&& source,
std::function<bool(const staj_event&, const ser_context&)> filter,
const ubjson_decode_options& options = ubjson_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_ubjson_cursor(Sourceable&& source,
std::function<bool(const staj_event&, const ser_context&)> filter,
std::error_code& ec)
: basic_ubjson_cursor(std::allocator_arg, Allocator(),
std::forward<Sourceable>(source), filter, ec)
{
}
template <class Sourceable>
JSONCONS_DEPRECATED_MSG("Instead, use pipe syntax for filter")
basic_ubjson_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 ubjson_stream_cursor = basic_ubjson_cursor<jsoncons::binary_stream_source>;
using ubjson_bytes_cursor = basic_ubjson_cursor<jsoncons::bytes_source>;
} // namespace ubjson
} // namespace jsoncons
#endif
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