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json_parser.hpp
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// Copyright 2013-2025 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_PARSER_HPP
#define JSONCONS_JSON_PARSER_HPP
#include <cstddef>
#include <cstdint>
#include <functional> // std::function
#include <limits> // std::numeric_limits
#include <memory> // std::allocator
#include <string>
#include <system_error>
#include <unordered_map>
#include <utility>
#include <vector>
#include <jsoncons/config/compiler_support.hpp>
#include <jsoncons/detail/parse_number.hpp>
#include <jsoncons/json_error.hpp>
#include <jsoncons/json_exception.hpp>
#include <jsoncons/json_filter.hpp>
#include <jsoncons/json_options.hpp>
#include <jsoncons/json_type.hpp>
#include <jsoncons/json_visitor.hpp>
#include <jsoncons/semantic_tag.hpp>
#include <jsoncons/ser_context.hpp>
#include <jsoncons/utility/unicode_traits.hpp>
#define JSONCONS_ILLEGAL_CONTROL_CHARACTER \
case 0x00:case 0x01:case 0x02:case 0x03:case 0x04:case 0x05:case 0x06:case 0x07:case 0x08:case 0x0b: \
case 0x0c:case 0x0e:case 0x0f:case 0x10:case 0x11:case 0x12:case 0x13:case 0x14:case 0x15:case 0x16: \
case 0x17:case 0x18:case 0x19:case 0x1a:case 0x1b:case 0x1c:case 0x1d:case 0x1e:case 0x1f
namespace jsoncons {
namespace detail {
}
enum class parse_state : uint8_t
{
root,
start,
accept,
slash,
slash_slash,
slash_star,
slash_star_star,
expect_comma_or_end,
object,
expect_member_name_or_end,
expect_member_name,
expect_colon,
expect_value_or_end,
expect_value,
array,
string,
member_name,
number,
n,
nu,
nul,
t,
tr,
tru,
f,
fa,
fal,
fals,
cr,
done
};
enum class parse_string_state : uint8_t
{
text = 0,
escape,
escape_u1,
escape_u2,
escape_u3,
escape_u4,
escape_expect_surrogate_pair1,
escape_expect_surrogate_pair2,
escape_u5,
escape_u6,
escape_u7,
escape_u8
};
enum class parse_number_state : uint8_t
{
minus,
zero,
integer,
fraction1,
fraction2,
exp1,
exp2,
exp3
};
template <typename CharT,typename TempAllocator = std::allocator<char>>
class basic_json_parser : public ser_context
{
public:
using char_type = CharT;
using string_view_type = typename basic_json_visitor<CharT>::string_view_type;
private:
struct string_maps_to_double
{
string_view_type s;
bool operator()(const std::pair<string_view_type,double>& val) const
{
return val.first == s;
}
};
using temp_allocator_type = TempAllocator;
using char_allocator_type = typename std::allocator_traits<temp_allocator_type>:: template rebind_alloc<CharT>;
using parse_state_allocator_type = typename std::allocator_traits<temp_allocator_type>:: template rebind_alloc<parse_state>;
static constexpr std::size_t initial_string_buffer_capacity = 256;
static constexpr int default_initial_stack_capacity = 66;
int max_nesting_depth_;
bool allow_trailing_comma_;
bool allow_comments_;
bool lossless_number_;
std::function<bool(json_errc,const ser_context&)> err_handler_;
int level_{0};
uint32_t cp_{0};
uint32_t cp2_{0};
std::size_t line_{1};
std::size_t position_{0};
std::size_t mark_position_{0};
std::size_t begin_position_{0};
const char_type* begin_input_{nullptr};
const char_type* end_input_{nullptr};
const char_type* input_ptr_{nullptr};
parse_state state_{parse_state::start};
parse_string_state string_state_{};
parse_number_state number_state_{};
bool more_{true};
bool done_{false};
bool cursor_mode_{false};
int mark_level_{0};
std::basic_string<char_type,std::char_traits<char_type>,char_allocator_type> string_buffer_;
jsoncons::detail::chars_to to_double_;
std::vector<parse_state,parse_state_allocator_type> state_stack_;
std::vector<std::pair<std::basic_string<char_type>,double>> string_double_map_;
// Noncopyable and nonmoveable
basic_json_parser(const basic_json_parser&) = delete;
basic_json_parser& operator=(const basic_json_parser&) = delete;
public:
basic_json_parser(const TempAllocator& temp_alloc = TempAllocator())
: basic_json_parser(basic_json_decode_options<char_type>(), default_json_parsing(), temp_alloc)
{
}
basic_json_parser(std::function<bool(json_errc,const ser_context&)> err_handler,
const TempAllocator& temp_alloc = TempAllocator())
: basic_json_parser(basic_json_decode_options<char_type>(), err_handler, temp_alloc)
{
}
basic_json_parser(const basic_json_decode_options<char_type>& options,
const TempAllocator& temp_alloc = TempAllocator())
: basic_json_parser(options, options.err_handler(), temp_alloc)
{
}
basic_json_parser(const basic_json_decode_options<char_type>& options,
std::function<bool(json_errc,const ser_context&)> err_handler,
const TempAllocator& temp_alloc = TempAllocator())
: max_nesting_depth_(options.max_nesting_depth()),
allow_trailing_comma_(options.allow_trailing_comma()),
allow_comments_(options.allow_comments()),
lossless_number_(options.lossless_number()),
err_handler_(err_handler),
string_buffer_(temp_alloc),
state_stack_(temp_alloc)
{
string_buffer_.reserve(initial_string_buffer_capacity);
std::size_t initial_stack_capacity = options.max_nesting_depth() <= (default_initial_stack_capacity-2) ? (options.max_nesting_depth()+2) : default_initial_stack_capacity;
state_stack_.reserve(initial_stack_capacity );
push_state(parse_state::root);
if (options.enable_str_to_nan())
{
string_double_map_.emplace_back(options.nan_to_str(),std::nan(""));
}
if (options.enable_str_to_inf())
{
string_double_map_.emplace_back(options.inf_to_str(),std::numeric_limits<double>::infinity());
}
if (options.enable_str_to_neginf())
{
string_double_map_.emplace_back(options.neginf_to_str(),-std::numeric_limits<double>::infinity());
}
}
void cursor_mode(bool value)
{
cursor_mode_ = value;
}
int level() const
{
return level_;
}
int mark_level() const
{
return mark_level_;
}
void mark_level(int value)
{
mark_level_ = value;
}
bool source_exhausted() const
{
return input_ptr_ == end_input_;
}
~basic_json_parser() noexcept
{
}
parse_state parent() const
{
JSONCONS_ASSERT(state_stack_.size() >= 1);
return state_stack_.back();
}
bool done() const
{
return done_;
}
bool enter() const
{
return state_ == parse_state::start;
}
bool accept() const
{
return state_ == parse_state::accept || done_;
}
bool stopped() const
{
return !more_;
}
parse_state state() const
{
return state_;
}
bool finished() const
{
return !more_ && state_ != parse_state::accept;
}
const char_type* first() const
{
return begin_input_;
}
const char_type* current() const
{
return input_ptr_;
}
const char_type* last() const
{
return end_input_;
}
void skip_whitespace()
{
const char_type* local_input_end = end_input_;
while (input_ptr_ != local_input_end)
{
switch (state_)
{
case parse_state::cr:
++line_;
//++position_;
switch (*input_ptr_)
{
case '\n':
++input_ptr_;
++position_;
mark_position_ = position_;
state_ = pop_state();
break;
default:
mark_position_ = position_;
state_ = pop_state();
break;
}
break;
default:
switch (*input_ptr_)
{
case ' ':case '\t':case '\n':case '\r':
skip_space(&input_ptr_);
break;
default:
return;
}
break;
}
}
}
void begin_object(basic_json_visitor<char_type>& visitor, std::error_code& ec)
{
if (JSONCONS_UNLIKELY(++level_ > max_nesting_depth_))
{
more_ = err_handler_(json_errc::max_nesting_depth_exceeded, *this);
if (!more_)
{
ec = json_errc::max_nesting_depth_exceeded;
return;
}
}
push_state(parse_state::object);
state_ = parse_state::expect_member_name_or_end;
visitor.begin_object(semantic_tag::none, *this, ec);
more_ = !cursor_mode_;
}
void end_object(basic_json_visitor<char_type>& visitor, std::error_code& ec)
{
if (JSONCONS_UNLIKELY(level_ < 1))
{
err_handler_(json_errc::unexpected_rbrace, *this);
ec = json_errc::unexpected_rbrace;
more_ = false;
return;
}
state_ = pop_state();
if (state_ == parse_state::object)
{
visitor.end_object(*this, ec);
}
else if (state_ == parse_state::array)
{
err_handler_(json_errc::expected_comma_or_rbracket, *this);
ec = json_errc::expected_comma_or_rbracket;
more_ = false;
return;
}
else
{
err_handler_(json_errc::unexpected_rbrace, *this);
ec = json_errc::unexpected_rbrace;
more_ = false;
return;
}
more_ = !cursor_mode_;
if (level_ == mark_level_)
{
more_ = false;
}
--level_;
if (level_ == 0)
{
state_ = parse_state::accept;
}
else
{
state_ = parse_state::expect_comma_or_end;
}
}
void begin_array(basic_json_visitor<char_type>& visitor, std::error_code& ec)
{
if (++level_ > max_nesting_depth_)
{
more_ = err_handler_(json_errc::max_nesting_depth_exceeded, *this);
if (!more_)
{
ec = json_errc::max_nesting_depth_exceeded;
return;
}
}
push_state(parse_state::array);
state_ = parse_state::expect_value_or_end;
visitor.begin_array(semantic_tag::none, *this, ec);
more_ = !cursor_mode_;
}
void end_array(basic_json_visitor<char_type>& visitor, std::error_code& ec)
{
if (level_ < 1)
{
err_handler_(json_errc::unexpected_rbracket, *this);
ec = json_errc::unexpected_rbracket;
more_ = false;
return;
}
state_ = pop_state();
if (state_ == parse_state::array)
{
visitor.end_array(*this, ec);
}
else if (state_ == parse_state::object)
{
err_handler_(json_errc::expected_comma_or_rbrace, *this);
ec = json_errc::expected_comma_or_rbrace;
more_ = false;
return;
}
else
{
err_handler_(json_errc::unexpected_rbracket, *this);
ec = json_errc::unexpected_rbracket;
more_ = false;
return;
}
more_ = !cursor_mode_;
if (level_ == mark_level_)
{
more_ = false;
}
--level_;
if (level_ == 0)
{
state_ = parse_state::accept;
}
else
{
state_ = parse_state::expect_comma_or_end;
}
}
void reinitialize()
{
reset();
cp_ = 0;
cp2_ = 0;
begin_position_ = 0;
begin_input_ = nullptr;
end_input_ = nullptr;
input_ptr_ = nullptr;
string_buffer_.clear();
}
void reset()
{
state_stack_.clear();
push_state(parse_state::root);
state_ = parse_state::start;
more_ = true;
done_ = false;
line_ = 1;
position_ = 0;
mark_position_ = 0;
level_ = 0;
}
void restart()
{
more_ = true;
}
void check_done()
{
std::error_code ec;
check_done(ec);
if (JSONCONS_UNLIKELY(ec))
{
JSONCONS_THROW(ser_error(ec,line_,column()));
}
}
void check_done(std::error_code& ec)
{
for (; input_ptr_ != end_input_; ++input_ptr_)
{
char_type curr_char_ = *input_ptr_;
switch (curr_char_)
{
case '\n':
case '\r':
case '\t':
case ' ':
break;
default:
more_ = err_handler_(json_errc::extra_character, *this);
if (!more_)
{
ec = json_errc::extra_character;
return;
}
break;
}
}
}
void update(const string_view_type sv)
{
update(sv.data(),sv.length());
}
void update(const char_type* data, std::size_t length)
{
begin_input_ = data;
end_input_ = data + length;
input_ptr_ = begin_input_;
}
void parse_some(basic_json_visitor<char_type>& visitor)
{
std::error_code ec;
parse_some(visitor, ec);
if (JSONCONS_UNLIKELY(ec))
{
JSONCONS_THROW(ser_error(ec,line_,column()));
}
}
void parse_some(basic_json_visitor<char_type>& visitor, std::error_code& ec)
{
parse_some_(visitor, ec);
}
void finish_parse(basic_json_visitor<char_type>& visitor)
{
std::error_code ec;
finish_parse(visitor, ec);
if (JSONCONS_UNLIKELY(ec))
{
JSONCONS_THROW(ser_error(ec,line_,column()));
}
}
void finish_parse(basic_json_visitor<char_type>& visitor, std::error_code& ec)
{
while (!finished())
{
parse_some(visitor, ec);
}
}
void parse_some_(basic_json_visitor<char_type>& visitor, std::error_code& ec)
{
if (state_ == parse_state::accept)
{
visitor.flush();
done_ = true;
state_ = parse_state::done;
more_ = false;
return;
}
const char_type* local_input_end = end_input_;
if (input_ptr_ == local_input_end && more_)
{
switch (state_)
{
case parse_state::number:
if (number_state_ == parse_number_state::zero || number_state_ == parse_number_state::integer)
{
end_integer_value(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
}
else if (number_state_ == parse_number_state::fraction2 || number_state_ == parse_number_state::exp3)
{
end_fraction_value(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
}
else
{
err_handler_(json_errc::unexpected_eof, *this);
ec = json_errc::unexpected_eof;
more_ = false;
}
break;
case parse_state::accept:
visitor.flush();
done_ = true;
state_ = parse_state::done;
more_ = false;
break;
case parse_state::start:
more_ = false;
ec = json_errc::unexpected_eof;
break;
case parse_state::done:
more_ = false;
break;
case parse_state::cr:
state_ = pop_state();
break;
default:
err_handler_(json_errc::unexpected_eof, *this);
ec = json_errc::unexpected_eof;
more_ = false;
return;
}
}
while ((input_ptr_ < local_input_end) && more_)
{
switch (state_)
{
case parse_state::accept:
visitor.flush();
done_ = true;
state_ = parse_state::done;
more_ = false;
break;
case parse_state::cr:
++line_;
switch (*input_ptr_)
{
case '\n':
++input_ptr_;
++position_;
state_ = pop_state();
break;
default:
state_ = pop_state();
break;
}
mark_position_ = position_;
break;
case parse_state::start:
{
switch (*input_ptr_)
{
JSONCONS_ILLEGAL_CONTROL_CHARACTER:
more_ = err_handler_(json_errc::illegal_control_character, *this);
if (!more_)
{
ec = json_errc::illegal_control_character;
return;
}
break;
case ' ':case '\t':case '\n':case '\r':
skip_space(&input_ptr_);
break;
case '/':
++input_ptr_;
++position_;
push_state(state_);
state_ = parse_state::slash;
break;
case '{':
begin_position_ = position_;
++input_ptr_;
++position_;
begin_object(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
break;
case '[':
begin_position_ = position_;
++input_ptr_;
++position_;
begin_array(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
break;
case '\"':
state_ = parse_state::string;
string_state_ = parse_string_state{};
begin_position_ = position_;
++input_ptr_;
++position_;
string_buffer_.clear();
parse_string(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
break;
case '-':
string_buffer_.clear();
string_buffer_.push_back('-');
begin_position_ = position_;
++input_ptr_;
++position_;
state_ = parse_state::number;
number_state_ = parse_number_state::minus;
parse_number(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) {return;}
break;
case '0':
string_buffer_.clear();
string_buffer_.push_back(static_cast<char>(*input_ptr_));
state_ = parse_state::number;
number_state_ = parse_number_state::zero;
begin_position_ = position_;
++input_ptr_;
++position_;
parse_number(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) {return;}
break;
case '1':case '2':case '3':case '4':case '5':case '6':case '7':case '8': case '9':
string_buffer_.clear();
string_buffer_.push_back(static_cast<char>(*input_ptr_));
begin_position_ = position_;
++input_ptr_;
++position_;
state_ = parse_state::number;
number_state_ = parse_number_state::integer;
parse_number(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) {return;}
break;
case 'n':
parse_null(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) {return;}
break;
case 't':
parse_true(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) {return;}
break;
case 'f':
parse_false(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) {return;}
break;
case '}':
err_handler_(json_errc::unexpected_rbrace, *this);
ec = json_errc::unexpected_rbrace;
more_ = false;
return;
case ']':
err_handler_(json_errc::unexpected_rbracket, *this);
ec = json_errc::unexpected_rbracket;
more_ = false;
return;
default:
err_handler_(json_errc::syntax_error, *this);
ec = json_errc::syntax_error;
more_ = false;
return;
}
break;
}
case parse_state::expect_comma_or_end:
{
switch (*input_ptr_)
{
JSONCONS_ILLEGAL_CONTROL_CHARACTER:
more_ = err_handler_(json_errc::illegal_control_character, *this);
if (!more_)
{
ec = json_errc::illegal_control_character;
return;
}
++input_ptr_;
++position_;
break;
case ' ':case '\t':case '\n':case '\r':
skip_space(&input_ptr_);
break;
case '/':
++input_ptr_;
++position_;
push_state(state_);
state_ = parse_state::slash;
break;
case '}':
begin_position_ = position_;
++input_ptr_;
++position_;
end_object(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
break;
case ']':
begin_position_ = position_;
++input_ptr_;
++position_;
end_array(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
break;
case ',':
begin_member_or_element(ec);
if (JSONCONS_UNLIKELY(ec)) return;
++input_ptr_;
++position_;
break;
default:
if (parent() == parse_state::array)
{
more_ = err_handler_(json_errc::expected_comma_or_rbracket, *this);
if (!more_)
{
ec = json_errc::expected_comma_or_rbracket;
return;
}
}
else if (parent() == parse_state::object)
{
more_ = err_handler_(json_errc::expected_comma_or_rbrace, *this);
if (!more_)
{
ec = json_errc::expected_comma_or_rbrace;
return;
}
}
++input_ptr_;
++position_;
break;
}
break;
}
case parse_state::expect_member_name_or_end:
{
if (input_ptr_ >= local_input_end)
{
return;
}
switch (*input_ptr_)
{
JSONCONS_ILLEGAL_CONTROL_CHARACTER:
more_ = err_handler_(json_errc::illegal_control_character, *this);
if (!more_)
{
ec = json_errc::illegal_control_character;
return;
}
++input_ptr_;
++position_;
break;
case ' ':case '\t':case '\n':case '\r':
skip_space(&input_ptr_);
break;
case '/':
++input_ptr_;
++position_;
push_state(state_);
state_ = parse_state::slash;
break;
case '}':
begin_position_ = position_;
++input_ptr_;
++position_;
end_object(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
break;
case '\"':
begin_position_ = position_;
++input_ptr_;
++position_;
push_state(parse_state::member_name);
state_ = parse_state::string;
string_state_ = parse_string_state{};
string_buffer_.clear();
parse_string(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
break;
case '\'':
more_ = err_handler_(json_errc::single_quote, *this);
if (!more_)
{
ec = json_errc::single_quote;
return;
}
++input_ptr_;
++position_;
break;
default:
more_ = err_handler_(json_errc::expected_key, *this);
if (!more_)
{
ec = json_errc::expected_key;
return;
}
++input_ptr_;
++position_;
break;
}
break;
}
case parse_state::expect_member_name:
{
switch (*input_ptr_)
{
JSONCONS_ILLEGAL_CONTROL_CHARACTER:
more_ = err_handler_(json_errc::illegal_control_character, *this);
if (!more_)
{
ec = json_errc::illegal_control_character;
return;
}
++input_ptr_;
++position_;
break;
case ' ':case '\t':case '\n':case '\r':
skip_space(&input_ptr_);
break;
case '/':
++input_ptr_;
++position_;
push_state(state_);
state_ = parse_state::slash;
break;
case '\"':
begin_position_ = position_;
++input_ptr_;
++position_;
push_state(parse_state::member_name);
state_ = parse_state::string;
string_state_ = parse_string_state{};
string_buffer_.clear();
parse_string(visitor, ec);
if (JSONCONS_UNLIKELY(ec)) return;
break;
case '}':
begin_position_ = position_;
++input_ptr_;
++position_;
if (!allow_trailing_comma_)
{
more_ = err_handler_(json_errc::extra_comma, *this);
if (!more_)
{
ec = json_errc::extra_comma;
return;
}
}
end_object(visitor, ec); // Recover
if (JSONCONS_UNLIKELY(ec)) return;
break;
case '\'':
more_ = err_handler_(json_errc::single_quote, *this);
if (!more_)
{
ec = json_errc::single_quote;
return;
}
++input_ptr_;
++position_;
break;
default:
more_ = err_handler_(json_errc::expected_key, *this);
if (!more_)
{
ec = json_errc::expected_key;
return;
}
++input_ptr_;
++position_;
break;
}
break;
}
case parse_state::expect_colon:
{
switch (*input_ptr_)
{
JSONCONS_ILLEGAL_CONTROL_CHARACTER:
more_ = err_handler_(json_errc::illegal_control_character, *this);
if (!more_)
{
ec = json_errc::illegal_control_character;
return;
}
++input_ptr_;
++position_;
break;
case ' ':case '\t':case '\n':case '\r':
skip_space(&input_ptr_);
break;
case '/':
push_state(state_);
state_ = parse_state::slash;
++input_ptr_;
++position_;
break;
case ':':
state_ = parse_state::expect_value;
++input_ptr_;
++position_;
break;
default:
more_ = err_handler_(json_errc::expected_colon, *this);
if (!more_)