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Merge branch 'develop' into feature/ubjson

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Niels Lohmann 2018-01-14 10:10:56 +01:00
commit 1b54d4a5aa
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33 changed files with 16786 additions and 650 deletions
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1
.gitignore vendored
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@ -21,3 +21,4 @@ benchmarks/files/numbers/*.json
cmake-build-debug
test/test-*
third_party/Amalgamate

8
CMakeLists.txt
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@ -6,6 +6,12 @@ cmake_minimum_required(VERSION 3.0.0)
##
project(nlohmann_json VERSION 3.0.1 LANGUAGES CXX)
##
## INCLUDE
##
##
include(ExternalProject)
##
## OPTIONS
##
@ -15,7 +21,7 @@ option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ON)
## CONFIGURATION
##
set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME})
set(NLOHMANN_JSON_SOURCE_DIR "src/")
set(NLOHMANN_JSON_SOURCE_DIR "src")
set(NLOHMANN_JSON_CONFIG_INSTALL_DIR "lib/cmake/${PROJECT_NAME}")
set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR "include")
set(NLOHMANN_JSON_HEADER_INSTALL_DIR "${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}/nlohmann")

47
Makefile
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@ -1,8 +1,38 @@
.PHONY: pretty clean ChangeLog.md
SRCS = develop/json.hpp \
develop/json_fwd.hpp \
develop/detail/macro_scope.hpp \
develop/detail/macro_unscope.hpp \
develop/detail/meta.hpp \
develop/detail/exceptions.hpp \
develop/detail/value_t.hpp \
develop/detail/conversions/from_json.hpp \
develop/detail/conversions/to_json.hpp \
develop/detail/parsing/input_adapters.hpp \
develop/detail/parsing/lexer.hpp \
develop/detail/parsing/parser.hpp \
develop/detail/iterators/primitive_iterator.hpp \
develop/detail/iterators/internal_iterator.hpp \
develop/detail/iterators/iter_impl.hpp \
develop/detail/iterators/iteration_proxy.hpp \
develop/detail/iterators/json_reverse_iterator.hpp \
develop/detail/parsing/output_adapters.hpp \
develop/detail/parsing/binary_reader.hpp \
develop/detail/parsing/binary_writer.hpp \
develop/detail/serializer.hpp \
develop/detail/json_ref.hpp \
develop/adl_serializer.hpp
UNAME = $(shell uname)
CXX=clang++
# main target
all:
@echo "amalgamate - amalgamate file src/json.hpp from the develop sources"
@echo "ChangeLog.md - generate ChangeLog file"
@echo "check - compile and execute test suite"
@echo "check-amalagamation - check whether sources have been amalgamated"
@echo "check-fast - compile and execute test suite (skip long-running tests)"
@echo "clean - remove built files"
@echo "coverage - create coverage information with lcov"
@ -16,7 +46,6 @@ all:
@echo "pedantic_gcc - run GCC with maximal warning flags"
@echo "pretty - beautify code with Artistic Style"
##########################################################################
# unit tests
##########################################################################
@ -218,9 +247,23 @@ pretty:
--indent-col1-comments --pad-oper --pad-header --align-pointer=type \
--align-reference=type --add-brackets --convert-tabs --close-templates \
--lineend=linux --preserve-date --suffix=none --formatted \
src/json.hpp test/src/*.cpp \
$(SRCS) src/json.hpp test/src/*.cpp \
benchmarks/src/benchmarks.cpp doc/examples/*.cpp
# create single header file
amalgamate: src/json.hpp
src/json.hpp: $(SRCS)
develop/amalgamate/amalgamate.py -c develop/amalgamate/config.json -s develop --verbose=yes
$(MAKE) pretty
# check if src/json.hpp has been amalgamated from the develop sources
check-amalagamation:
@mv src/json.hpp src/json.hpp~
@$(MAKE) amalgamate
@diff src/json.hpp src/json.hpp~ || (echo "===================================================================\n Amalgamation required! Please read the contribution guidelines\n in file .github/CONTRIBUTING.md.\n===================================================================" ; mv src/json.hpp~ src/json.hpp ; false)
@mv src/json.hpp~ src/json.hpp
##########################################################################
# changelog

45
develop/adl_serializer.hpp Normal file
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@ -0,0 +1,45 @@
#pragma once
#include <utility>
#include "detail/conversions/from_json.hpp"
#include "detail/conversions/to_json.hpp"
namespace nlohmann
{
template<typename, typename>
struct adl_serializer
{
/*!
@brief convert a JSON value to any value type
This function is usually called by the `get()` function of the
@ref basic_json class (either explicit or via conversion operators).
@param[in] j JSON value to read from
@param[in,out] val value to write to
*/
template<typename BasicJsonType, typename ValueType>
static void from_json(BasicJsonType&& j, ValueType& val) noexcept(
noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), val)))
{
::nlohmann::from_json(std::forward<BasicJsonType>(j), val);
}
/*!
@brief convert any value type to a JSON value
This function is usually called by the constructors of the @ref basic_json
class.
@param[in,out] j JSON value to write to
@param[in] val value to read from
*/
template<typename BasicJsonType, typename ValueType>
static void to_json(BasicJsonType& j, ValueType&& val) noexcept(
noexcept(::nlohmann::to_json(j, std::forward<ValueType>(val))))
{
::nlohmann::to_json(j, std::forward<ValueType>(val));
}
};
}

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develop/amalgamate/CHANGES.md Normal file
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@ -0,0 +1,10 @@
The following changes have been made to the code with respect to <https://github.com/edlund/amalgamate/commit/c91f07eea1133aa184f652b8f1398eaf03586208>:
- Resolved inspection results from PyCharm:
- replaced tabs with spaces
- added encoding annotation
- reindented file to remove trailing whitespaces
- unused import `sys`
- membership check
- made function from `_is_within`
- removed unused variable `actual_path`

27
develop/amalgamate/LICENSE.md Normal file
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@ -0,0 +1,27 @@
amalgamate.py - Amalgamate C source and header files
Copyright (c) 2012, Erik Edlund <erik.edlund@32767.se>
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of Erik Edlund, nor the names of its contributors may
be used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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develop/amalgamate/README.md Normal file
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@ -0,0 +1,66 @@
# amalgamate.py - Amalgamate C source and header files
Origin: https://bitbucket.org/erikedlund/amalgamate
Mirror: https://github.com/edlund/amalgamate
`amalgamate.py` aims to make it easy to use SQLite-style C source and header
amalgamation in projects.
For more information, please refer to: http://sqlite.org/amalgamation.html
## Here be dragons
`amalgamate.py` is quite dumb, it only knows the bare minimum about C code
required in order to be able to handle trivial include directives. It can
produce weird results for unexpected code.
Things to be aware of:
`amalgamate.py` will not handle complex include directives correctly:
#define HEADER_PATH "path/to/header.h"
#include HEADER_PATH
In the above example, `path/to/header.h` will not be included in the
amalgamation (HEADER_PATH is never expanded).
`amalgamate.py` makes the assumption that each source and header file which
is not empty will end in a new-line character, which is not immediately
preceded by a backslash character (see 5.1.1.2p1.2 of ISO C99).
`amalgamate.py` should be usable with C++ code, but raw string literals from
C++11 will definitely cause problems:
R"delimiter(Terrible raw \ data " #include <sneaky.hpp>)delimiter"
R"delimiter(Terrible raw \ data " escaping)delimiter"
In the examples above, `amalgamate.py` will stop parsing the raw string literal
when it encounters the first quotation mark, which will produce unexpected
results.
## Installing amalgamate.py
Python v.2.7.0 or higher is required.
`amalgamate.py` can be tested and installed using the following commands:
./test.sh && sudo -k cp ./amalgamate.py /usr/local/bin/
## Using amalgamate.py
amalgamate.py [-v] -c path/to/config.json -s path/to/source/dir \
[-p path/to/prologue.(c|h)]
* The `-c, --config` option should specify the path to a JSON config file which
lists the source files, include paths and where to write the resulting
amalgamation. Have a look at `test/source.c.json` and `test/include.h.json`
to see two examples.
* The `-s, --source` option should specify the path to the source directory.
This is useful for supporting separate source and build directories.
* The `-p, --prologue` option should specify the path to a file which will be
added to the beginning of the amalgamation. It is optional.

299
develop/amalgamate/amalgamate.py Executable file
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@ -0,0 +1,299 @@
#!/usr/bin/env python
# coding=utf-8
# amalgamate.py - Amalgamate C source and header files.
# Copyright (c) 2012, Erik Edlund <erik.edlund@32767.se>
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# * Neither the name of Erik Edlund, nor the names of its contributors may
# be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import argparse
import datetime
import json
import os
import re
class Amalgamation(object):
# Prepends self.source_path to file_path if needed.
def actual_path(self, file_path):
if not os.path.isabs(file_path):
file_path = os.path.join(self.source_path, file_path)
return file_path
# Search included file_path in self.include_paths and
# in source_dir if specified.
def find_included_file(self, file_path, source_dir):
search_dirs = self.include_paths[:]
if source_dir:
search_dirs.insert(0, source_dir)
for search_dir in search_dirs:
search_path = os.path.join(search_dir, file_path)
if os.path.isfile(self.actual_path(search_path)):
return search_path
return None
def __init__(self, args):
with open(args.config, 'r') as f:
config = json.loads(f.read())
for key in config:
setattr(self, key, config[key])
self.verbose = args.verbose == "yes"
self.prologue = args.prologue
self.source_path = args.source_path
self.included_files = []
# Generate the amalgamation and write it to the target file.
def generate(self):
amalgamation = ""
if self.prologue:
with open(self.prologue, 'r') as f:
amalgamation += datetime.datetime.now().strftime(f.read())
if self.verbose:
print("Config:")
print(" target = {0}".format(self.target))
print(" working_dir = {0}".format(os.getcwd()))
print(" include_paths = {0}".format(self.include_paths))
print("Creating amalgamation:")
for file_path in self.sources:
# Do not check the include paths while processing the source
# list, all given source paths must be correct.
# actual_path = self.actual_path(file_path)
print(" - processing \"{0}\"".format(file_path))
t = TranslationUnit(file_path, self, True)
amalgamation += t.content
with open(self.target, 'w') as f:
f.write(amalgamation)
print("...done!\n")
if self.verbose:
print("Files processed: {0}".format(self.sources))
print("Files included: {0}".format(self.included_files))
print("")
def _is_within(match, matches):
for m in matches:
if match.start() > m.start() and \
match.end() < m.end():
return True
return False
class TranslationUnit(object):
# // C++ comment.
cpp_comment_pattern = re.compile(r"//.*?\n")
# /* C comment. */
c_comment_pattern = re.compile(r"/\*.*?\*/", re.S)
# "complex \"stri\\\ng\" value".
string_pattern = re.compile("[^']" r'".*?(?<=[^\\])"', re.S)
# Handle simple include directives. Support for advanced
# directives where macros and defines needs to expanded is
# not a concern right now.
include_pattern = re.compile(
r'#\s*include\s+(<|")(?P<path>.*?)("|>)', re.S)
# #pragma once
pragma_once_pattern = re.compile(r'#\s*pragma\s+once', re.S)
# Search for pattern in self.content, add the match to
# contexts if found and update the index accordingly.
def _search_content(self, index, pattern, contexts):
match = pattern.search(self.content, index)
if match:
contexts.append(match)
return match.end()
return index + 2
# Return all the skippable contexts, i.e., comments and strings
def _find_skippable_contexts(self):
# Find contexts in the content in which a found include
# directive should not be processed.
skippable_contexts = []
# Walk through the content char by char, and try to grab
# skippable contexts using regular expressions when found.
i = 1
content_len = len(self.content)
while i < content_len:
j = i - 1
current = self.content[i]
previous = self.content[j]
if current == '"':
# String value.
i = self._search_content(j, self.string_pattern,
skippable_contexts)
elif current == '*' and previous == '/':
# C style comment.
i = self._search_content(j, self.c_comment_pattern,
skippable_contexts)
elif current == '/' and previous == '/':
# C++ style comment.
i = self._search_content(j, self.cpp_comment_pattern,
skippable_contexts)
else:
# Skip to the next char.
i += 1
return skippable_contexts
# Returns True if the match is within list of other matches
# Removes pragma once from content
def _process_pragma_once(self):
content_len = len(self.content)
if content_len < len("#include <x>"):
return 0
# Find contexts in the content in which a found include
# directive should not be processed.
skippable_contexts = self._find_skippable_contexts()
pragmas = []
pragma_once_match = self.pragma_once_pattern.search(self.content)
while pragma_once_match:
if not _is_within(pragma_once_match, skippable_contexts):
pragmas.append(pragma_once_match)
pragma_once_match = self.pragma_once_pattern.search(self.content,
pragma_once_match.end())
# Handle all collected pragma once directives.
prev_end = 0
tmp_content = ''
for pragma_match in pragmas:
tmp_content += self.content[prev_end:pragma_match.start()]
prev_end = pragma_match.end()
tmp_content += self.content[prev_end:]
self.content = tmp_content
# Include all trivial #include directives into self.content.
def _process_includes(self):
content_len = len(self.content)
if content_len < len("#include <x>"):
return 0
# Find contexts in the content in which a found include
# directive should not be processed.
skippable_contexts = self._find_skippable_contexts()
# Search for include directives in the content, collect those
# which should be included into the content.
includes = []
include_match = self.include_pattern.search(self.content)
while include_match:
if not _is_within(include_match, skippable_contexts):
include_path = include_match.group("path")
search_same_dir = include_match.group(1) == '"'
found_included_path = self.amalgamation.find_included_file(
include_path, self.file_dir if search_same_dir else None)
if found_included_path:
includes.append((include_match, found_included_path))
include_match = self.include_pattern.search(self.content,
include_match.end())
# Handle all collected include directives.
prev_end = 0
tmp_content = ''
for include in includes:
include_match, found_included_path = include
tmp_content += self.content[prev_end:include_match.start()]
tmp_content += "// {0}\n".format(include_match.group(0))
if found_included_path not in self.amalgamation.included_files:
t = TranslationUnit(found_included_path, self.amalgamation, False)
tmp_content += t.content
prev_end = include_match.end()
tmp_content += self.content[prev_end:]
self.content = tmp_content
return len(includes)
# Make all content processing
def _process(self):
if not self.is_root:
self._process_pragma_once()
self._process_includes()
def __init__(self, file_path, amalgamation, is_root):
self.file_path = file_path
self.file_dir = os.path.dirname(file_path)
self.amalgamation = amalgamation
self.is_root = is_root
self.amalgamation.included_files.append(self.file_path)
actual_path = self.amalgamation.actual_path(file_path)
if not os.path.isfile(actual_path):
raise IOError("File not found: \"{0}\"".format(file_path))
with open(actual_path, 'r') as f:
self.content = f.read()
self._process()
def main():
description = "Amalgamate C source and header files."
usage = " ".join([
"amalgamate.py",
"[-v]",
"-c path/to/config.json",
"-s path/to/source/dir",
"[-p path/to/prologue.(c|h)]"
])
argsparser = argparse.ArgumentParser(
description=description, usage=usage)
argsparser.add_argument("-v", "--verbose", dest="verbose",
choices=["yes", "no"], metavar="", help="be verbose")
argsparser.add_argument("-c", "--config", dest="config",
required=True, metavar="", help="path to a JSON config file")
argsparser.add_argument("-s", "--source", dest="source_path",
required=True, metavar="", help="source code path")
argsparser.add_argument("-p", "--prologue", dest="prologue",
required=False, metavar="", help="path to a C prologue file")
amalgamation = Amalgamation(argsparser.parse_args())
amalgamation.generate()
if __name__ == "__main__":
main()

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develop/amalgamate/config.json Normal file
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@ -0,0 +1,8 @@
{
"project": "JSON for Modern C++",
"target": "src/json.hpp",
"sources": [
"json.hpp"
],
"include_paths": ["."]
}

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develop/detail/conversions/from_json.hpp Normal file
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@ -0,0 +1,315 @@
#pragma once
#include <algorithm> // transform
#include <array> // array
#include <ciso646> // and, not
#include <forward_list> // forward_list
#include <iterator> // inserter, front_inserter, end
#include <string> // string
#include <tuple> // tuple, make_tuple
#include <type_traits> // is_arithmetic, is_same, is_enum, underlying_type, is_convertible
#include <utility> // pair, declval
#include <valarray> // valarray
#include "detail/exceptions.hpp"
#include "detail/macro_scope.hpp"
#include "detail/meta.hpp"
#include "detail/value_t.hpp"
namespace nlohmann
{
namespace detail
{
// overloads for basic_json template parameters
template<typename BasicJsonType, typename ArithmeticType,
enable_if_t<std::is_arithmetic<ArithmeticType>::value and
not std::is_same<ArithmeticType, typename BasicJsonType::boolean_t>::value,
int> = 0>
void get_arithmetic_value(const BasicJsonType& j, ArithmeticType& val)
{
switch (static_cast<value_t>(j))
{
case value_t::number_unsigned:
{
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_unsigned_t*>());
break;
}
case value_t::number_integer:
{
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_integer_t*>());
break;
}
case value_t::number_float:
{
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_float_t*>());
break;
}
default:
JSON_THROW(type_error::create(302, "type must be number, but is " + std::string(j.type_name())));
}
}
template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::boolean_t& b)
{
if (JSON_UNLIKELY(not j.is_boolean()))
{
JSON_THROW(type_error::create(302, "type must be boolean, but is " + std::string(j.type_name())));
}
b = *j.template get_ptr<const typename BasicJsonType::boolean_t*>();
}
template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::string_t& s)
{
if (JSON_UNLIKELY(not j.is_string()))
{
JSON_THROW(type_error::create(302, "type must be string, but is " + std::string(j.type_name())));
}
s = *j.template get_ptr<const typename BasicJsonType::string_t*>();
}
template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::number_float_t& val)
{
get_arithmetic_value(j, val);
}
template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::number_unsigned_t& val)
{
get_arithmetic_value(j, val);
}
template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::number_integer_t& val)
{
get_arithmetic_value(j, val);
}
template<typename BasicJsonType, typename EnumType,
enable_if_t<std::is_enum<EnumType>::value, int> = 0>
void from_json(const BasicJsonType& j, EnumType& e)
{
typename std::underlying_type<EnumType>::type val;
get_arithmetic_value(j, val);
e = static_cast<EnumType>(val);
}
template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::array_t& arr)
{
if (JSON_UNLIKELY(not j.is_array()))
{
JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
}
arr = *j.template get_ptr<const typename BasicJsonType::array_t*>();
}
// forward_list doesn't have an insert method
template<typename BasicJsonType, typename T, typename Allocator,
enable_if_t<std::is_convertible<BasicJsonType, T>::value, int> = 0>
void from_json(const BasicJsonType& j, std::forward_list<T, Allocator>& l)
{
if (JSON_UNLIKELY(not j.is_array()))
{
JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
}
std::transform(j.rbegin(), j.rend(),
std::front_inserter(l), [](const BasicJsonType & i)
{
return i.template get<T>();
});
}
// valarray doesn't have an insert method
template<typename BasicJsonType, typename T,
enable_if_t<std::is_convertible<BasicJsonType, T>::value, int> = 0>
void from_json(const BasicJsonType& j, std::valarray<T>& l)
{
if (JSON_UNLIKELY(not j.is_array()))
{
JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
}
l.resize(j.size());
std::copy(j.m_value.array->begin(), j.m_value.array->end(), std::begin(l));
}
template<typename BasicJsonType, typename CompatibleArrayType>
void from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, priority_tag<0> /*unused*/)
{
using std::end;
std::transform(j.begin(), j.end(),
std::inserter(arr, end(arr)), [](const BasicJsonType & i)
{
// get<BasicJsonType>() returns *this, this won't call a from_json
// method when value_type is BasicJsonType
return i.template get<typename CompatibleArrayType::value_type>();
});
}
template<typename BasicJsonType, typename CompatibleArrayType>
auto from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, priority_tag<1> /*unused*/)
-> decltype(
arr.reserve(std::declval<typename CompatibleArrayType::size_type>()),
void())
{
using std::end;
arr.reserve(j.size());
std::transform(j.begin(), j.end(),
std::inserter(arr, end(arr)), [](const BasicJsonType & i)
{
// get<BasicJsonType>() returns *this, this won't call a from_json
// method when value_type is BasicJsonType
return i.template get<typename CompatibleArrayType::value_type>();
});
}
template<typename BasicJsonType, typename T, std::size_t N>
void from_json_array_impl(const BasicJsonType& j, std::array<T, N>& arr, priority_tag<2> /*unused*/)
{
for (std::size_t i = 0; i < N; ++i)
{
arr[i] = j.at(i).template get<T>();
}
}
template<typename BasicJsonType, typename CompatibleArrayType,
enable_if_t<is_compatible_array_type<BasicJsonType, CompatibleArrayType>::value and
std::is_convertible<BasicJsonType, typename CompatibleArrayType::value_type>::value and
not std::is_same<typename BasicJsonType::array_t, CompatibleArrayType>::value, int> = 0>
void from_json(const BasicJsonType& j, CompatibleArrayType& arr)
{
if (JSON_UNLIKELY(not j.is_array()))
{
JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
}
from_json_array_impl(j, arr, priority_tag<2> {});
}
template<typename BasicJsonType, typename CompatibleObjectType,
enable_if_t<is_compatible_object_type<BasicJsonType, CompatibleObjectType>::value, int> = 0>
void from_json(const BasicJsonType& j, CompatibleObjectType& obj)
{
if (JSON_UNLIKELY(not j.is_object()))
{
JSON_THROW(type_error::create(302, "type must be object, but is " + std::string(j.type_name())));
}
auto inner_object = j.template get_ptr<const typename BasicJsonType::object_t*>();
using value_type = typename CompatibleObjectType::value_type;
std::transform(
inner_object->begin(), inner_object->end(),
std::inserter(obj, obj.begin()),
[](typename BasicJsonType::object_t::value_type const & p)
{
return value_type(p.first, p.second.template get<typename CompatibleObjectType::mapped_type>());
});
}
// overload for arithmetic types, not chosen for basic_json template arguments
// (BooleanType, etc..); note: Is it really necessary to provide explicit
// overloads for boolean_t etc. in case of a custom BooleanType which is not
// an arithmetic type?
template<typename BasicJsonType, typename ArithmeticType,
enable_if_t <
std::is_arithmetic<ArithmeticType>::value and
not std::is_same<ArithmeticType, typename BasicJsonType::number_unsigned_t>::value and
not std::is_same<ArithmeticType, typename BasicJsonType::number_integer_t>::value and
not std::is_same<ArithmeticType, typename BasicJsonType::number_float_t>::value and
not std::is_same<ArithmeticType, typename BasicJsonType::boolean_t>::value,
int> = 0>
void from_json(const BasicJsonType& j, ArithmeticType& val)
{
switch (static_cast<value_t>(j))
{
case value_t::number_unsigned:
{
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_unsigned_t*>());
break;
}
case value_t::number_integer:
{
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_integer_t*>());
break;
}
case value_t::number_float:
{
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_float_t*>());
break;
}
case value_t::boolean:
{
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::boolean_t*>());
break;
}
default:
JSON_THROW(type_error::create(302, "type must be number, but is " + std::string(j.type_name())));
}
}
template<typename BasicJsonType, typename A1, typename A2>
void from_json(const BasicJsonType& j, std::pair<A1, A2>& p)
{
p = {j.at(0).template get<A1>(), j.at(1).template get<A2>()};
}
template<typename BasicJsonType, typename Tuple, std::size_t... Idx>
void from_json_tuple_impl(const BasicJsonType& j, Tuple& t, index_sequence<Idx...>)
{
t = std::make_tuple(j.at(Idx).template get<typename std::tuple_element<Idx, Tuple>::type>()...);
}
template<typename BasicJsonType, typename... Args>
void from_json(const BasicJsonType& j, std::tuple<Args...>& t)
{
from_json_tuple_impl(j, t, index_sequence_for<Args...> {});
}
struct from_json_fn
{
private:
template<typename BasicJsonType, typename T>
auto call(const BasicJsonType& j, T& val, priority_tag<1> /*unused*/) const
noexcept(noexcept(from_json(j, val)))
-> decltype(from_json(j, val), void())
{
return from_json(j, val);
}
template<typename BasicJsonType, typename T>
void call(const BasicJsonType& /*unused*/, T& /*unused*/, priority_tag<0> /*unused*/) const noexcept
{
static_assert(sizeof(BasicJsonType) == 0,
"could not find from_json() method in T's namespace");
#ifdef _MSC_VER
// MSVC does not show a stacktrace for the above assert
using decayed = uncvref_t<T>;
static_assert(sizeof(typename decayed::force_msvc_stacktrace) == 0,
"forcing MSVC stacktrace to show which T we're talking about.");
#endif
}
public:
template<typename BasicJsonType, typename T>
void operator()(const BasicJsonType& j, T& val) const
noexcept(noexcept(std::declval<from_json_fn>().call(j, val, priority_tag<1> {})))
{
return call(j, val, priority_tag<1> {});
}
};
}
/// namespace to hold default `from_json` function
/// to see why this is required:
/// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4381.html
namespace
{
constexpr const auto& from_json = detail::static_const<detail::from_json_fn>::value;
}
}

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#pragma once
#include <ciso646> // or, and, not
#include <iterator> // begin, end
#include <tuple> // tuple, get
#include <type_traits> // is_same, is_constructible, is_floating_point, is_enum, underlying_type
#include <utility> // move, forward, declval, pair
#include <valarray> // valarray
#include <vector> // vector
#include "detail/meta.hpp"
#include "detail/value_t.hpp"
namespace nlohmann
{
namespace detail
{
//////////////////
// constructors //
//////////////////
template<value_t> struct external_constructor;
template<>
struct external_constructor<value_t::boolean>
{
template<typename BasicJsonType>
static void construct(BasicJsonType& j, typename BasicJsonType::boolean_t b) noexcept
{
j.m_type = value_t::boolean;
j.m_value = b;
j.assert_invariant();
}
};
template<>
struct external_constructor<value_t::string>
{
template<typename BasicJsonType>
static void construct(BasicJsonType& j, const typename BasicJsonType::string_t& s)
{
j.m_type = value_t::string;
j.m_value = s;
j.assert_invariant();
}
template<typename BasicJsonType>
static void construct(BasicJsonType& j, typename BasicJsonType::string_t&& s)
{
j.m_type = value_t::string;
j.m_value = std::move(s);
j.assert_invariant();
}
};
template<>
struct external_constructor<value_t::number_float>
{
template<typename BasicJsonType>
static void construct(BasicJsonType& j, typename BasicJsonType::number_float_t val) noexcept
{
j.m_type = value_t::number_float;
j.m_value = val;
j.assert_invariant();
}
};
template<>
struct external_constructor<value_t::number_unsigned>
{
template<typename BasicJsonType>
static void construct(BasicJsonType& j, typename BasicJsonType::number_unsigned_t val) noexcept
{
j.m_type = value_t::number_unsigned;
j.m_value = val;
j.assert_invariant();
}
};
template<>
struct external_constructor<value_t::number_integer>
{
template<typename BasicJsonType>
static void construct(BasicJsonType& j, typename BasicJsonType::number_integer_t val) noexcept
{
j.m_type = value_t::number_integer;
j.m_value = val;
j.assert_invariant();
}
};
template<>
struct external_constructor<value_t::array>
{
template<typename BasicJsonType>
static void construct(BasicJsonType& j, const typename BasicJsonType::array_t& arr)
{
j.m_type = value_t::array;
j.m_value = arr;
j.assert_invariant();
}
template<typename BasicJsonType>
static void construct(BasicJsonType& j, typename BasicJsonType::array_t&& arr)
{
j.m_type = value_t::array;
j.m_value = std::move(arr);
j.assert_invariant();
}
template<typename BasicJsonType, typename CompatibleArrayType,
enable_if_t<not std::is_same<CompatibleArrayType, typename BasicJsonType::array_t>::value,
int> = 0>
static void construct(BasicJsonType& j, const CompatibleArrayType& arr)
{
using std::begin;
using std::end;
j.m_type = value_t::array;
j.m_value.array = j.template create<typename BasicJsonType::array_t>(begin(arr), end(arr));
j.assert_invariant();
}
template<typename BasicJsonType>
static void construct(BasicJsonType& j, const std::vector<bool>& arr)
{
j.m_type = value_t::array;
j.m_value = value_t::array;
j.m_value.array->reserve(arr.size());
for (const bool x : arr)
{
j.m_value.array->push_back(x);
}
j.assert_invariant();
}
template<typename BasicJsonType, typename T,
enable_if_t<std::is_convertible<T, BasicJsonType>::value, int> = 0>
static void construct(BasicJsonType& j, const std::valarray<T>& arr)
{
j.m_type = value_t::array;
j.m_value = value_t::array;
j.m_value.array->resize(arr.size());
std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
j.assert_invariant();
}
};
template<>
struct external_constructor<value_t::object>
{
template<typename BasicJsonType>
static void construct(BasicJsonType& j, const typename BasicJsonType::object_t& obj)
{
j.m_type = value_t::object;
j.m_value = obj;
j.assert_invariant();
}
template<typename BasicJsonType>
static void construct(BasicJsonType& j, typename BasicJsonType::object_t&& obj)
{
j.m_type = value_t::object;
j.m_value = std::move(obj);
j.assert_invariant();
}
template<typename BasicJsonType, typename CompatibleObjectType,
enable_if_t<not std::is_same<CompatibleObjectType, typename BasicJsonType::object_t>::value, int> = 0>
static void construct(BasicJsonType& j, const CompatibleObjectType& obj)
{
using std::begin;
using std::end;
j.m_type = value_t::object;
j.m_value.object = j.template create<typename BasicJsonType::object_t>(begin(obj), end(obj));
j.assert_invariant();
}
};
/////////////
// to_json //
/////////////
template<typename BasicJsonType, typename T,
enable_if_t<std::is_same<T, typename BasicJsonType::boolean_t>::value, int> = 0>
void to_json(BasicJsonType& j, T b) noexcept
{
external_constructor<value_t::boolean>::construct(j, b);
}
template<typename BasicJsonType, typename CompatibleString,
enable_if_t<std::is_constructible<typename BasicJsonType::string_t, CompatibleString>::value, int> = 0>
void to_json(BasicJsonType& j, const CompatibleString& s)
{
external_constructor<value_t::string>::construct(j, s);
}
template<typename BasicJsonType>
void to_json(BasicJsonType& j, typename BasicJsonType::string_t&& s)
{
external_constructor<value_t::string>::construct(j, std::move(s));
}
template<typename BasicJsonType, typename FloatType,
enable_if_t<std::is_floating_point<FloatType>::value, int> = 0>
void to_json(BasicJsonType& j, FloatType val) noexcept
{
external_constructor<value_t::number_float>::construct(j, static_cast<typename BasicJsonType::number_float_t>(val));
}
template<typename BasicJsonType, typename CompatibleNumberUnsignedType,
enable_if_t<is_compatible_integer_type<typename BasicJsonType::number_unsigned_t, CompatibleNumberUnsignedType>::value, int> = 0>
void to_json(BasicJsonType& j, CompatibleNumberUnsignedType val) noexcept
{
external_constructor<value_t::number_unsigned>::construct(j, static_cast<typename BasicJsonType::number_unsigned_t>(val));
}
template<typename BasicJsonType, typename CompatibleNumberIntegerType,
enable_if_t<is_compatible_integer_type<typename BasicJsonType::number_integer_t, CompatibleNumberIntegerType>::value, int> = 0>
void to_json(BasicJsonType& j, CompatibleNumberIntegerType val) noexcept
{
external_constructor<value_t::number_integer>::construct(j, static_cast<typename BasicJsonType::number_integer_t>(val));
}
template<typename BasicJsonType, typename EnumType,
enable_if_t<std::is_enum<EnumType>::value, int> = 0>
void to_json(BasicJsonType& j, EnumType e) noexcept
{
using underlying_type = typename std::underlying_type<EnumType>::type;
external_constructor<value_t::number_integer>::construct(j, static_cast<underlying_type>(e));
}
template<typename BasicJsonType>
void to_json(BasicJsonType& j, const std::vector<bool>& e)
{
external_constructor<value_t::array>::construct(j, e);
}
template<typename BasicJsonType, typename CompatibleArrayType,
enable_if_t<is_compatible_array_type<BasicJsonType, CompatibleArrayType>::value or
std::is_same<typename BasicJsonType::array_t, CompatibleArrayType>::value,
int> = 0>
void to_json(BasicJsonType& j, const CompatibleArrayType& arr)
{
external_constructor<value_t::array>::construct(j, arr);
}
template<typename BasicJsonType, typename T,
enable_if_t<std::is_convertible<T, BasicJsonType>::value, int> = 0>
void to_json(BasicJsonType& j, std::valarray<T> arr)
{
external_constructor<value_t::array>::construct(j, std::move(arr));
}
template<typename BasicJsonType>
void to_json(BasicJsonType& j, typename BasicJsonType::array_t&& arr)
{
external_constructor<value_t::array>::construct(j, std::move(arr));
}
template<typename BasicJsonType, typename CompatibleObjectType,
enable_if_t<is_compatible_object_type<BasicJsonType, CompatibleObjectType>::value, int> = 0>
void to_json(BasicJsonType& j, const CompatibleObjectType& obj)
{
external_constructor<value_t::object>::construct(j, obj);
}
template<typename BasicJsonType>
void to_json(BasicJsonType& j, typename BasicJsonType::object_t&& obj)
{
external_constructor<value_t::object>::construct(j, std::move(obj));
}
template<typename BasicJsonType, typename T, std::size_t N,
enable_if_t<not std::is_constructible<typename BasicJsonType::string_t, T (&)[N]>::value, int> = 0>
void to_json(BasicJsonType& j, T (&arr)[N])
{
external_constructor<value_t::array>::construct(j, arr);
}
template<typename BasicJsonType, typename... Args>
void to_json(BasicJsonType& j, const std::pair<Args...>& p)
{
j = {p.first, p.second};
}
template<typename BasicJsonType, typename Tuple, std::size_t... Idx>
void to_json_tuple_impl(BasicJsonType& j, const Tuple& t, index_sequence<Idx...>)
{
j = {std::get<Idx>(t)...};
}
template<typename BasicJsonType, typename... Args>
void to_json(BasicJsonType& j, const std::tuple<Args...>& t)
{
to_json_tuple_impl(j, t, index_sequence_for<Args...> {});
}
struct to_json_fn
{
private:
template<typename BasicJsonType, typename T>
auto call(BasicJsonType& j, T&& val, priority_tag<1> /*unused*/) const noexcept(noexcept(to_json(j, std::forward<T>(val))))
-> decltype(to_json(j, std::forward<T>(val)), void())
{
return to_json(j, std::forward<T>(val));
}
template<typename BasicJsonType, typename T>
void call(BasicJsonType& /*unused*/, T&& /*unused*/, priority_tag<0> /*unused*/) const noexcept
{
static_assert(sizeof(BasicJsonType) == 0,
"could not find to_json() method in T's namespace");
#ifdef _MSC_VER
// MSVC does not show a stacktrace for the above assert
using decayed = uncvref_t<T>;
static_assert(sizeof(typename decayed::force_msvc_stacktrace) == 0,
"forcing MSVC stacktrace to show which T we're talking about.");
#endif
}
public:
template<typename BasicJsonType, typename T>
void operator()(BasicJsonType& j, T&& val) const
noexcept(noexcept(std::declval<to_json_fn>().call(j, std::forward<T>(val), priority_tag<1> {})))
{
return call(j, std::forward<T>(val), priority_tag<1> {});
}
};
}
/// namespace to hold default `to_json` function
namespace
{
constexpr const auto& to_json = detail::static_const<detail::to_json_fn>::value;
}
}

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#ifndef NLOHMANN_JSON_DETAIL_EXCEPTIONS_HPP
#define NLOHMANN_JSON_DETAIL_EXCEPTIONS_HPP
#include <exception> // exception
#include <stdexcept> // runtime_error
#include <string> // to_string
namespace nlohmann
{
namespace detail
{
////////////////
// exceptions //
////////////////
/*!
@brief general exception of the @ref basic_json class
This class is an extension of `std::exception` objects with a member @a id for
exception ids. It is used as the base class for all exceptions thrown by the
@ref basic_json class. This class can hence be used as "wildcard" to catch
exceptions.
Subclasses:
- @ref parse_error for exceptions indicating a parse error
- @ref invalid_iterator for exceptions indicating errors with iterators
- @ref type_error for exceptions indicating executing a member function with
a wrong type
- @ref out_of_range for exceptions indicating access out of the defined range
- @ref other_error for exceptions indicating other library errors
@internal
@note To have nothrow-copy-constructible exceptions, we internally use
`std::runtime_error` which can cope with arbitrary-length error messages.
Intermediate strings are built with static functions and then passed to
the actual constructor.
@endinternal
@liveexample{The following code shows how arbitrary library exceptions can be
caught.,exception}
@since version 3.0.0
*/
class exception : public std::exception
{
public:
/// returns the explanatory string
const char* what() const noexcept override
{
return m.what();
}
/// the id of the exception
const int id;
protected:
exception(int id_, const char* what_arg) : id(id_), m(what_arg) {}
static std::string name(const std::string& ename, int id_)
{
return "[json.exception." + ename + "." + std::to_string(id_) + "] ";
}
private:
/// an exception object as storage for error messages
std::runtime_error m;
};
/*!
@brief exception indicating a parse error
This exception is thrown by the library when a parse error occurs. Parse errors
can occur during the deserialization of JSON text, CBOR, MessagePack, as well
as when using JSON Patch.
Member @a byte holds the byte index of the last read character in the input
file.
Exceptions have ids 1xx.
name / id | example message | description
------------------------------ | --------------- | -------------------------
json.exception.parse_error.101 | parse error at 2: unexpected end of input; expected string literal | This error indicates a syntax error while deserializing a JSON text. The error message describes that an unexpected token (character) was encountered, and the member @a byte indicates the error position.
json.exception.parse_error.102 | parse error at 14: missing or wrong low surrogate | JSON uses the `\uxxxx` format to describe Unicode characters. Code points above above 0xFFFF are split into two `\uxxxx` entries ("surrogate pairs"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.
json.exception.parse_error.103 | parse error: code points above 0x10FFFF are invalid | Unicode supports code points up to 0x10FFFF. Code points above 0x10FFFF are invalid.
json.exception.parse_error.104 | parse error: JSON patch must be an array of objects | [RFC 6902](https://tools.ietf.org/html/rfc6902) requires a JSON Patch document to be a JSON document that represents an array of objects.
json.exception.parse_error.105 | parse error: operation must have string member 'op' | An operation of a JSON Patch document must contain exactly one "op" member, whose value indicates the operation to perform. Its value must be one of "add", "remove", "replace", "move", "copy", or "test"; other values are errors.
json.exception.parse_error.106 | parse error: array index '01' must not begin with '0' | An array index in a JSON Pointer ([RFC 6901](https://tools.ietf.org/html/rfc6901)) may be `0` or any number without a leading `0`.
json.exception.parse_error.107 | parse error: JSON pointer must be empty or begin with '/' - was: 'foo' | A JSON Pointer must be a Unicode string containing a sequence of zero or more reference tokens, each prefixed by a `/` character.
json.exception.parse_error.108 | parse error: escape character '~' must be followed with '0' or '1' | In a JSON Pointer, only `~0` and `~1` are valid escape sequences.
json.exception.parse_error.109 | parse error: array index 'one' is not a number | A JSON Pointer array index must be a number.
json.exception.parse_error.110 | parse error at 1: cannot read 2 bytes from vector | When parsing CBOR or MessagePack, the byte vector ends before the complete value has been read.
json.exception.parse_error.112 | parse error at 1: error reading CBOR; last byte: 0xF8 | Not all types of CBOR or MessagePack are supported. This exception occurs if an unsupported byte was read.
json.exception.parse_error.113 | parse error at 2: expected a CBOR string; last byte: 0x98 | While parsing a map key, a value that is not a string has been read.
@note For an input with n bytes, 1 is the index of the first character and n+1
is the index of the terminating null byte or the end of file. This also
holds true when reading a byte vector (CBOR or MessagePack).
@liveexample{The following code shows how a `parse_error` exception can be
caught.,parse_error}
@sa @ref exception for the base class of the library exceptions
@sa @ref invalid_iterator for exceptions indicating errors with iterators
@sa @ref type_error for exceptions indicating executing a member function with
a wrong type
@sa @ref out_of_range for exceptions indicating access out of the defined range
@sa @ref other_error for exceptions indicating other library errors
@since version 3.0.0
*/
class parse_error : public exception
{
public:
/*!
@brief create a parse error exception
@param[in] id_ the id of the exception
@param[in] byte_ the byte index where the error occurred (or 0 if the
position cannot be determined)
@param[in] what_arg the explanatory string
@return parse_error object
*/
static parse_error create(int id_, std::size_t byte_, const std::string& what_arg)
{
std::string w = exception::name("parse_error", id_) + "parse error" +
(byte_ != 0 ? (" at " + std::to_string(byte_)) : "") +
": " + what_arg;
return parse_error(id_, byte_, w.c_str());
}
/*!
@brief byte index of the parse error
The byte index of the last read character in the input file.
@note For an input with n bytes, 1 is the index of the first character and
n+1 is the index of the terminating null byte or the end of file.
This also holds true when reading a byte vector (CBOR or MessagePack).
*/
const std::size_t byte;
private:
parse_error(int id_, std::size_t byte_, const char* what_arg)
: exception(id_, what_arg), byte(byte_) {}
};
/*!
@brief exception indicating errors with iterators
This exception is thrown if iterators passed to a library function do not match
the expected semantics.
Exceptions have ids 2xx.
name / id | example message | description
----------------------------------- | --------------- | -------------------------
json.exception.invalid_iterator.201 | iterators are not compatible | The iterators passed to constructor @ref basic_json(InputIT first, InputIT last) are not compatible, meaning they do not belong to the same container. Therefore, the range (@a first, @a last) is invalid.
json.exception.invalid_iterator.202 | iterator does not fit current value | In an erase or insert function, the passed iterator @a pos does not belong to the JSON value for which the function was called. It hence does not define a valid position for the deletion/insertion.
json.exception.invalid_iterator.203 | iterators do not fit current value | Either iterator passed to function @ref erase(IteratorType first, IteratorType last) does not belong to the JSON value from which values shall be erased. It hence does not define a valid range to delete values from.
json.exception.invalid_iterator.204 | iterators out of range | When an iterator range for a primitive type (number, boolean, or string) is passed to a constructor or an erase function, this range has to be exactly (@ref begin(), @ref end()), because this is the only way the single stored value is expressed. All other ranges are invalid.
json.exception.invalid_iterator.205 | iterator out of range | When an iterator for a primitive type (number, boolean, or string) is passed to an erase function, the iterator has to be the @ref begin() iterator, because it is the only way to address the stored value. All other iterators are invalid.
json.exception.invalid_iterator.206 | cannot construct with iterators from null | The iterators passed to constructor @ref basic_json(InputIT first, InputIT last) belong to a JSON null value and hence to not define a valid range.
json.exception.invalid_iterator.207 | cannot use key() for non-object iterators | The key() member function can only be used on iterators belonging to a JSON object, because other types do not have a concept of a key.
json.exception.invalid_iterator.208 | cannot use operator[] for object iterators | The operator[] to specify a concrete offset cannot be used on iterators belonging to a JSON object, because JSON objects are unordered.
json.exception.invalid_iterator.209 | cannot use offsets with object iterators | The offset operators (+, -, +=, -=) cannot be used on iterators belonging to a JSON object, because JSON objects are unordered.
json.exception.invalid_iterator.210 | iterators do not fit | The iterator range passed to the insert function are not compatible, meaning they do not belong to the same container. Therefore, the range (@a first, @a last) is invalid.
json.exception.invalid_iterator.211 | passed iterators may not belong to container | The iterator range passed to the insert function must not be a subrange of the container to insert to.
json.exception.invalid_iterator.212 | cannot compare iterators of different containers | When two iterators are compared, they must belong to the same container.
json.exception.invalid_iterator.213 | cannot compare order of object iterators | The order of object iterators cannot be compared, because JSON objects are unordered.
json.exception.invalid_iterator.214 | cannot get value | Cannot get value for iterator: Either the iterator belongs to a null value or it is an iterator to a primitive type (number, boolean, or string), but the iterator is different to @ref begin().
@liveexample{The following code shows how an `invalid_iterator` exception can be
caught.,invalid_iterator}
@sa @ref exception for the base class of the library exceptions
@sa @ref parse_error for exceptions indicating a parse error
@sa @ref type_error for exceptions indicating executing a member function with
a wrong type
@sa @ref out_of_range for exceptions indicating access out of the defined range
@sa @ref other_error for exceptions indicating other library errors
@since version 3.0.0
*/
class invalid_iterator : public exception
{
public:
static invalid_iterator create(int id_, const std::string& what_arg)
{
std::string w = exception::name("invalid_iterator", id_) + what_arg;
return invalid_iterator(id_, w.c_str());
}
private:
invalid_iterator(int id_, const char* what_arg)
: exception(id_, what_arg) {}
};
/*!
@brief exception indicating executing a member function with a wrong type
This exception is thrown in case of a type error; that is, a library function is
executed on a JSON value whose type does not match the expected semantics.
Exceptions have ids 3xx.
name / id | example message | description
----------------------------- | --------------- | -------------------------
json.exception.type_error.301 | cannot create object from initializer list | To create an object from an initializer list, the initializer list must consist only of a list of pairs whose first element is a string. When this constraint is violated, an array is created instead.
json.exception.type_error.302 | type must be object, but is array | During implicit or explicit value conversion, the JSON type must be compatible to the target type. For instance, a JSON string can only be converted into string types, but not into numbers or boolean types.
json.exception.type_error.303 | incompatible ReferenceType for get_ref, actual type is object | To retrieve a reference to a value stored in a @ref basic_json object with @ref get_ref, the type of the reference must match the value type. For instance, for a JSON array, the @a ReferenceType must be @ref array_t&.
json.exception.type_error.304 | cannot use at() with string | The @ref at() member functions can only be executed for certain JSON types.
json.exception.type_error.305 | cannot use operator[] with string | The @ref operator[] member functions can only be executed for certain JSON types.
json.exception.type_error.306 | cannot use value() with string | The @ref value() member functions can only be executed for certain JSON types.
json.exception.type_error.307 | cannot use erase() with string | The @ref erase() member functions can only be executed for certain JSON types.
json.exception.type_error.308 | cannot use push_back() with string | The @ref push_back() and @ref operator+= member functions can only be executed for certain JSON types.
json.exception.type_error.309 | cannot use insert() with | The @ref insert() member functions can only be executed for certain JSON types.
json.exception.type_error.310 | cannot use swap() with number | The @ref swap() member functions can only be executed for certain JSON types.
json.exception.type_error.311 | cannot use emplace_back() with string | The @ref emplace_back() member function can only be executed for certain JSON types.
json.exception.type_error.312 | cannot use update() with string | The @ref update() member functions can only be executed for certain JSON types.
json.exception.type_error.313 | invalid value to unflatten | The @ref unflatten function converts an object whose keys are JSON Pointers back into an arbitrary nested JSON value. The JSON Pointers must not overlap, because then the resulting value would not be well defined.
json.exception.type_error.314 | only objects can be unflattened | The @ref unflatten function only works for an object whose keys are JSON Pointers.
json.exception.type_error.315 | values in object must be primitive | The @ref unflatten function only works for an object whose keys are JSON Pointers and whose values are primitive.
json.exception.type_error.316 | invalid UTF-8 byte at index 10: 0x7E | The @ref dump function only works with UTF-8 encoded strings; that is, if you assign a `std::string` to a JSON value, make sure it is UTF-8 encoded. |
@liveexample{The following code shows how a `type_error` exception can be
caught.,type_error}
@sa @ref exception for the base class of the library exceptions
@sa @ref parse_error for exceptions indicating a parse error
@sa @ref invalid_iterator for exceptions indicating errors with iterators
@sa @ref out_of_range for exceptions indicating access out of the defined range
@sa @ref other_error for exceptions indicating other library errors
@since version 3.0.0
*/
class type_error : public exception
{
public:
static type_error create(int id_, const std::string& what_arg)
{
std::string w = exception::name("type_error", id_) + what_arg;
return type_error(id_, w.c_str());
}
private:
type_error(int id_, const char* what_arg) : exception(id_, what_arg) {}
};
/*!
@brief exception indicating access out of the defined range
This exception is thrown in case a library function is called on an input
parameter that exceeds the expected range, for instance in case of array
indices or nonexisting object keys.
Exceptions have ids 4xx.
name / id | example message | description
------------------------------- | --------------- | -------------------------
json.exception.out_of_range.401 | array index 3 is out of range | The provided array index @a i is larger than @a size-1.
json.exception.out_of_range.402 | array index '-' (3) is out of range | The special array index `-` in a JSON Pointer never describes a valid element of the array, but the index past the end. That is, it can only be used to add elements at this position, but not to read it.
json.exception.out_of_range.403 | key 'foo' not found | The provided key was not found in the JSON object.
json.exception.out_of_range.404 | unresolved reference token 'foo' | A reference token in a JSON Pointer could not be resolved.
json.exception.out_of_range.405 | JSON pointer has no parent | The JSON Patch operations 'remove' and 'add' can not be applied to the root element of the JSON value.
json.exception.out_of_range.406 | number overflow parsing '10E1000' | A parsed number could not be stored as without changing it to NaN or INF.
@liveexample{The following code shows how an `out_of_range` exception can be
caught.,out_of_range}
@sa @ref exception for the base class of the library exceptions
@sa @ref parse_error for exceptions indicating a parse error
@sa @ref invalid_iterator for exceptions indicating errors with iterators
@sa @ref type_error for exceptions indicating executing a member function with
a wrong type
@sa @ref other_error for exceptions indicating other library errors
@since version 3.0.0
*/
class out_of_range : public exception
{
public:
static out_of_range create(int id_, const std::string& what_arg)
{
std::string w = exception::name("out_of_range", id_) + what_arg;
return out_of_range(id_, w.c_str());
}
private:
out_of_range(int id_, const char* what_arg) : exception(id_, what_arg) {}
};
/*!
@brief exception indicating other library errors
This exception is thrown in case of errors that cannot be classified with the
other exception types.
Exceptions have ids 5xx.
name / id | example message | description
------------------------------ | --------------- | -------------------------
json.exception.other_error.501 | unsuccessful: {"op":"test","path":"/baz", "value":"bar"} | A JSON Patch operation 'test' failed. The unsuccessful operation is also printed.
@sa @ref exception for the base class of the library exceptions
@sa @ref parse_error for exceptions indicating a parse error
@sa @ref invalid_iterator for exceptions indicating errors with iterators
@sa @ref type_error for exceptions indicating executing a member function with
a wrong type
@sa @ref out_of_range for exceptions indicating access out of the defined range
@liveexample{The following code shows how an `other_error` exception can be
caught.,other_error}
@since version 3.0.0
*/
class other_error : public exception
{
public:
static other_error create(int id_, const std::string& what_arg)
{
std::string w = exception::name("other_error", id_) + what_arg;
return other_error(id_, w.c_str());
}
private:
other_error(int id_, const char* what_arg) : exception(id_, what_arg) {}
};
}
}
#endif

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#pragma once
#include "detail/iterators/primitive_iterator.hpp"
namespace nlohmann
{
namespace detail
{
/*!
@brief an iterator value
@note This structure could easily be a union, but MSVC currently does not allow
unions members with complex constructors, see https://github.com/nlohmann/json/pull/105.
*/
template<typename BasicJsonType> struct internal_iterator
{
/// iterator for JSON objects
typename BasicJsonType::object_t::iterator object_iterator {};
/// iterator for JSON arrays
typename BasicJsonType::array_t::iterator array_iterator {};
/// generic iterator for all other types
primitive_iterator_t primitive_iterator {};
};
}
}

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#pragma once
#include <ciso646> // not
#include <iterator> // iterator, random_access_iterator_tag, bidirectional_iterator_tag, advance, next
#include <type_traits> // conditional, is_const, remove_const
#include "detail/exceptions.hpp"
#include "detail/iterators/internal_iterator.hpp"
#include "detail/iterators/primitive_iterator.hpp"
#include "detail/macro_scope.hpp"
#include "detail/meta.hpp"
#include "detail/value_t.hpp"
namespace nlohmann
{
namespace detail
{
// forward declare, to be able to friend it later on
template<typename IteratorType> class iteration_proxy;
/*!
@brief a template for a bidirectional iterator for the @ref basic_json class
This class implements a both iterators (iterator and const_iterator) for the
@ref basic_json class.
@note An iterator is called *initialized* when a pointer to a JSON value has
been set (e.g., by a constructor or a copy assignment). If the iterator is
default-constructed, it is *uninitialized* and most methods are undefined.
**The library uses assertions to detect calls on uninitialized iterators.**
@requirement The class satisfies the following concept requirements:
-
[BidirectionalIterator](http://en.cppreference.com/w/cpp/concept/BidirectionalIterator):
The iterator that can be moved can be moved in both directions (i.e.
incremented and decremented).
@since version 1.0.0, simplified in version 2.0.9, change to bidirectional
iterators in version 3.0.0 (see https://github.com/nlohmann/json/issues/593)
*/
template<typename BasicJsonType>
class iter_impl
{
/// allow basic_json to access private members
friend iter_impl<typename std::conditional<std::is_const<BasicJsonType>::value, typename std::remove_const<BasicJsonType>::type, const BasicJsonType>::type>;
friend BasicJsonType;
friend iteration_proxy<iter_impl>;
using object_t = typename BasicJsonType::object_t;
using array_t = typename BasicJsonType::array_t;
// make sure BasicJsonType is basic_json or const basic_json
static_assert(is_basic_json<typename std::remove_const<BasicJsonType>::type>::value,
"iter_impl only accepts (const) basic_json");
public:
/// The std::iterator class template (used as a base class to provide typedefs) is deprecated in C++17.
/// The C++ Standard has never required user-defined iterators to derive from std::iterator.
/// A user-defined iterator should provide publicly accessible typedefs named
/// iterator_category, value_type, difference_type, pointer, and reference.
/// Note that value_type is required to be non-const, even for constant iterators.
using iterator_category = std::bidirectional_iterator_tag;
/// the type of the values when the iterator is dereferenced
using value_type = typename BasicJsonType::value_type;
/// a type to represent differences between iterators
using difference_type = typename BasicJsonType::difference_type;
/// defines a pointer to the type iterated over (value_type)
using pointer = typename std::conditional<std::is_const<BasicJsonType>::value,
typename BasicJsonType::const_pointer,
typename BasicJsonType::pointer>::type;
/// defines a reference to the type iterated over (value_type)
using reference =
typename std::conditional<std::is_const<BasicJsonType>::value,
typename BasicJsonType::const_reference,
typename BasicJsonType::reference>::type;
/// default constructor
iter_impl() = default;
/*!
@brief constructor for a given JSON instance
@param[in] object pointer to a JSON object for this iterator
@pre object != nullptr
@post The iterator is initialized; i.e. `m_object != nullptr`.
*/
explicit iter_impl(pointer object) noexcept : m_object(object)
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
{
m_it.object_iterator = typename object_t::iterator();
break;
}
case value_t::array:
{
m_it.array_iterator = typename array_t::iterator();
break;
}
default:
{
m_it.primitive_iterator = primitive_iterator_t();
break;
}
}
}
/*!
@note The conventional copy constructor and copy assignment are implicitly
defined. Combined with the following converting constructor and
assignment, they support: (1) copy from iterator to iterator, (2)
copy from const iterator to const iterator, and (3) conversion from
iterator to const iterator. However conversion from const iterator
to iterator is not defined.
*/
/*!
@brief converting constructor
@param[in] other non-const iterator to copy from
@note It is not checked whether @a other is initialized.
*/
iter_impl(const iter_impl<typename std::remove_const<BasicJsonType>::type>& other) noexcept
: m_object(other.m_object), m_it(other.m_it) {}
/*!
@brief converting assignment
@param[in,out] other non-const iterator to copy from
@return const/non-const iterator
@note It is not checked whether @a other is initialized.
*/
iter_impl& operator=(const iter_impl<typename std::remove_const<BasicJsonType>::type>& other) noexcept
{
m_object = other.m_object;
m_it = other.m_it;
return *this;
}
private:
/*!
@brief set the iterator to the first value
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
void set_begin() noexcept
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
{
m_it.object_iterator = m_object->m_value.object->begin();
break;
}
case value_t::array:
{
m_it.array_iterator = m_object->m_value.array->begin();
break;
}
case value_t::null:
{
// set to end so begin()==end() is true: null is empty
m_it.primitive_iterator.set_end();
break;
}
default:
{
m_it.primitive_iterator.set_begin();
break;
}
}
}
/*!
@brief set the iterator past the last value
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
void set_end() noexcept
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
{
m_it.object_iterator = m_object->m_value.object->end();
break;
}
case value_t::array:
{
m_it.array_iterator = m_object->m_value.array->end();
break;
}
default:
{
m_it.primitive_iterator.set_end();
break;
}
}
}
public:
/*!
@brief return a reference to the value pointed to by the iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
reference operator*() const
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
{
assert(m_it.object_iterator != m_object->m_value.object->end());
return m_it.object_iterator->second;
}
case value_t::array:
{
assert(m_it.array_iterator != m_object->m_value.array->end());
return *m_it.array_iterator;
}
case value_t::null:
JSON_THROW(invalid_iterator::create(214, "cannot get value"));
default:
{
if (JSON_LIKELY(m_it.primitive_iterator.is_begin()))
{
return *m_object;
}
JSON_THROW(invalid_iterator::create(214, "cannot get value"));
}
}
}
/*!
@brief dereference the iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
pointer operator->() const
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
{
assert(m_it.object_iterator != m_object->m_value.object->end());
return &(m_it.object_iterator->second);
}
case value_t::array:
{
assert(m_it.array_iterator != m_object->m_value.array->end());
return &*m_it.array_iterator;
}
default:
{
if (JSON_LIKELY(m_it.primitive_iterator.is_begin()))
{
return m_object;
}
JSON_THROW(invalid_iterator::create(214, "cannot get value"));
}
}
}
/*!
@brief post-increment (it++)
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
iter_impl const operator++(int)
{
auto result = *this;
++(*this);
return result;
}
/*!
@brief pre-increment (++it)
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
iter_impl& operator++()
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
{
std::advance(m_it.object_iterator, 1);
break;
}
case value_t::array:
{
std::advance(m_it.array_iterator, 1);
break;
}
default:
{
++m_it.primitive_iterator;
break;
}
}
return *this;
}
/*!
@brief post-decrement (it--)
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
iter_impl const operator--(int)
{
auto result = *this;
--(*this);
return result;
}
/*!
@brief pre-decrement (--it)
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
iter_impl& operator--()
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
{
std::advance(m_it.object_iterator, -1);
break;
}
case value_t::array:
{
std::advance(m_it.array_iterator, -1);
break;
}
default:
{
--m_it.primitive_iterator;
break;
}
}
return *this;
}
/*!
@brief comparison: equal
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
bool operator==(const iter_impl& other) const
{
// if objects are not the same, the comparison is undefined
if (JSON_UNLIKELY(m_object != other.m_object))
{
JSON_THROW(invalid_iterator::create(212, "cannot compare iterators of different containers"));
}
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
return (m_it.object_iterator == other.m_it.object_iterator);
case value_t::array:
return (m_it.array_iterator == other.m_it.array_iterator);
default:
return (m_it.primitive_iterator == other.m_it.primitive_iterator);
}
}
/*!
@brief comparison: not equal
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
bool operator!=(const iter_impl& other) const
{
return not operator==(other);
}
/*!
@brief comparison: smaller
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
bool operator<(const iter_impl& other) const
{
// if objects are not the same, the comparison is undefined
if (JSON_UNLIKELY(m_object != other.m_object))
{
JSON_THROW(invalid_iterator::create(212, "cannot compare iterators of different containers"));
}
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
JSON_THROW(invalid_iterator::create(213, "cannot compare order of object iterators"));
case value_t::array:
return (m_it.array_iterator < other.m_it.array_iterator);
default:
return (m_it.primitive_iterator < other.m_it.primitive_iterator);
}
}
/*!
@brief comparison: less than or equal
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
bool operator<=(const iter_impl& other) const
{
return not other.operator < (*this);
}
/*!
@brief comparison: greater than
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
bool operator>(const iter_impl& other) const
{
return not operator<=(other);
}
/*!
@brief comparison: greater than or equal
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
bool operator>=(const iter_impl& other) const
{
return not operator<(other);
}
/*!
@brief add to iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
iter_impl& operator+=(difference_type i)
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
JSON_THROW(invalid_iterator::create(209, "cannot use offsets with object iterators"));
case value_t::array:
{
std::advance(m_it.array_iterator, i);
break;
}
default:
{
m_it.primitive_iterator += i;
break;
}
}
return *this;
}
/*!
@brief subtract from iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
iter_impl& operator-=(difference_type i)
{
return operator+=(-i);
}
/*!
@brief add to iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
iter_impl operator+(difference_type i) const
{
auto result = *this;
result += i;
return result;
}
/*!
@brief addition of distance and iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
friend iter_impl operator+(difference_type i, const iter_impl& it)
{
auto result = it;
result += i;
return result;
}
/*!
@brief subtract from iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
iter_impl operator-(difference_type i) const
{
auto result = *this;
result -= i;
return result;
}
/*!
@brief return difference
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
difference_type operator-(const iter_impl& other) const
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
JSON_THROW(invalid_iterator::create(209, "cannot use offsets with object iterators"));
case value_t::array:
return m_it.array_iterator - other.m_it.array_iterator;
default:
return m_it.primitive_iterator - other.m_it.primitive_iterator;
}
}
/*!
@brief access to successor
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
reference operator[](difference_type n) const
{
assert(m_object != nullptr);
switch (m_object->m_type)
{
case value_t::object:
JSON_THROW(invalid_iterator::create(208, "cannot use operator[] for object iterators"));
case value_t::array:
return *std::next(m_it.array_iterator, n);
case value_t::null:
JSON_THROW(invalid_iterator::create(214, "cannot get value"));
default:
{
if (JSON_LIKELY(m_it.primitive_iterator.get_value() == -n))
{
return *m_object;
}
JSON_THROW(invalid_iterator::create(214, "cannot get value"));
}
}
}
/*!
@brief return the key of an object iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
typename object_t::key_type key() const
{
assert(m_object != nullptr);
if (JSON_LIKELY(m_object->is_object()))
{
return m_it.object_iterator->first;
}
JSON_THROW(invalid_iterator::create(207, "cannot use key() for non-object iterators"));
}
/*!
@brief return the value of an iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
reference value() const
{
return operator*();
}
private:
/// associated JSON instance
pointer m_object = nullptr;
/// the actual iterator of the associated instance
internal_iterator<typename std::remove_const<BasicJsonType>::type> m_it = {};
};
}
}

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#pragma once
#include <cstddef> // size_t
#include <string> // string, to_string
#include "detail/value_t.hpp"
namespace nlohmann
{
namespace detail
{
/// proxy class for the iterator_wrapper functions
template<typename IteratorType> class iteration_proxy
{
private:
/// helper class for iteration
class iteration_proxy_internal
{
private:
/// the iterator
IteratorType anchor;
/// an index for arrays (used to create key names)
std::size_t array_index = 0;
public:
explicit iteration_proxy_internal(IteratorType it) noexcept : anchor(it) {}
/// dereference operator (needed for range-based for)
iteration_proxy_internal& operator*()
{
return *this;
}
/// increment operator (needed for range-based for)
iteration_proxy_internal& operator++()
{
++anchor;
++array_index;
return *this;
}
/// inequality operator (needed for range-based for)
bool operator!=(const iteration_proxy_internal& o) const noexcept
{
return anchor != o.anchor;
}
/// return key of the iterator
std::string key() const
{
assert(anchor.m_object != nullptr);
switch (anchor.m_object->type())
{
// use integer array index as key
case value_t::array:
return std::to_string(array_index);
// use key from the object
case value_t::object:
return anchor.key();
// use an empty key for all primitive types
default:
return "";
}
}
/// return value of the iterator
typename IteratorType::reference value() const
{
return anchor.value();
}
};
/// the container to iterate
typename IteratorType::reference container;
public:
/// construct iteration proxy from a container
explicit iteration_proxy(typename IteratorType::reference cont)
: container(cont) {}
/// return iterator begin (needed for range-based for)
iteration_proxy_internal begin() noexcept
{
return iteration_proxy_internal(container.begin());
}
/// return iterator end (needed for range-based for)
iteration_proxy_internal end() noexcept
{
return iteration_proxy_internal(container.end());
}
};
}
}

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#pragma once
#include <cstddef> // ptrdiff_t
#include <iterator> // reverse_iterator
#include <utility> // declval
namespace nlohmann
{
namespace detail
{
//////////////////////
// reverse_iterator //
//////////////////////
/*!
@brief a template for a reverse iterator class
@tparam Base the base iterator type to reverse. Valid types are @ref
iterator (to create @ref reverse_iterator) and @ref const_iterator (to
create @ref const_reverse_iterator).
@requirement The class satisfies the following concept requirements:
-
[BidirectionalIterator](http://en.cppreference.com/w/cpp/concept/BidirectionalIterator):
The iterator that can be moved can be moved in both directions (i.e.
incremented and decremented).
- [OutputIterator](http://en.cppreference.com/w/cpp/concept/OutputIterator):
It is possible to write to the pointed-to element (only if @a Base is
@ref iterator).
@since version 1.0.0
*/
template<typename Base>
class json_reverse_iterator : public std::reverse_iterator<Base>
{
public:
using difference_type = std::ptrdiff_t;
/// shortcut to the reverse iterator adapter
using base_iterator = std::reverse_iterator<Base>;
/// the reference type for the pointed-to element
using reference = typename Base::reference;
/// create reverse iterator from iterator
json_reverse_iterator(const typename base_iterator::iterator_type& it) noexcept
: base_iterator(it) {}
/// create reverse iterator from base class
json_reverse_iterator(const base_iterator& it) noexcept : base_iterator(it) {}
/// post-increment (it++)
json_reverse_iterator const operator++(int)
{
return static_cast<json_reverse_iterator>(base_iterator::operator++(1));
}
/// pre-increment (++it)
json_reverse_iterator& operator++()
{
return static_cast<json_reverse_iterator&>(base_iterator::operator++());
}
/// post-decrement (it--)
json_reverse_iterator const operator--(int)
{
return static_cast<json_reverse_iterator>(base_iterator::operator--(1));
}
/// pre-decrement (--it)
json_reverse_iterator& operator--()
{
return static_cast<json_reverse_iterator&>(base_iterator::operator--());
}
/// add to iterator
json_reverse_iterator& operator+=(difference_type i)
{
return static_cast<json_reverse_iterator&>(base_iterator::operator+=(i));
}
/// add to iterator
json_reverse_iterator operator+(difference_type i) const
{
return static_cast<json_reverse_iterator>(base_iterator::operator+(i));
}
/// subtract from iterator
json_reverse_iterator operator-(difference_type i) const
{
return static_cast<json_reverse_iterator>(base_iterator::operator-(i));
}
/// return difference
difference_type operator-(const json_reverse_iterator& other) const
{
return base_iterator(*this) - base_iterator(other);
}
/// access to successor
reference operator[](difference_type n) const
{
return *(this->operator+(n));
}
/// return the key of an object iterator
auto key() const -> decltype(std::declval<Base>().key())
{
auto it = --this->base();
return it.key();
}
/// return the value of an iterator
reference value() const
{
auto it = --this->base();
return it.operator * ();
}
};
}
}

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#pragma once
#include <ciso646> // not
#include <cstddef> // ptrdiff_t
#include <limits> // numeric_limits
#include <ostream> // ostream
namespace nlohmann
{
namespace detail
{
/*
@brief an iterator for primitive JSON types
This class models an iterator for primitive JSON types (boolean, number,
string). It's only purpose is to allow the iterator/const_iterator classes
to "iterate" over primitive values. Internally, the iterator is modeled by
a `difference_type` variable. Value begin_value (`0`) models the begin,
end_value (`1`) models past the end.
*/
class primitive_iterator_t
{
public:
using difference_type = std::ptrdiff_t;
constexpr difference_type get_value() const noexcept
{
return m_it;
}
/// set iterator to a defined beginning
void set_begin() noexcept
{
m_it = begin_value;
}
/// set iterator to a defined past the end
void set_end() noexcept
{
m_it = end_value;
}
/// return whether the iterator can be dereferenced
constexpr bool is_begin() const noexcept
{
return m_it == begin_value;
}
/// return whether the iterator is at end
constexpr bool is_end() const noexcept
{
return m_it == end_value;
}
friend constexpr bool operator==(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it == rhs.m_it;
}
friend constexpr bool operator<(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it < rhs.m_it;
}
primitive_iterator_t operator+(difference_type i)
{
auto result = *this;
result += i;
return result;
}
friend constexpr difference_type operator-(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it - rhs.m_it;
}
friend std::ostream& operator<<(std::ostream& os, primitive_iterator_t it)
{
return os << it.m_it;
}
primitive_iterator_t& operator++()
{
++m_it;
return *this;
}
primitive_iterator_t const operator++(int)
{
auto result = *this;
m_it++;
return result;
}
primitive_iterator_t& operator--()
{
--m_it;
return *this;
}
primitive_iterator_t const operator--(int)
{
auto result = *this;
m_it--;
return result;
}
primitive_iterator_t& operator+=(difference_type n)
{
m_it += n;
return *this;
}
primitive_iterator_t& operator-=(difference_type n)
{
m_it -= n;
return *this;
}
private:
static constexpr difference_type begin_value = 0;
static constexpr difference_type end_value = begin_value + 1;
/// iterator as signed integer type
difference_type m_it = (std::numeric_limits<std::ptrdiff_t>::min)();
};
}
}

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#pragma once
#include <initializer_list>
#include <utility>
namespace nlohmann
{
namespace detail
{
template<typename BasicJsonType>
class json_ref
{
public:
using value_type = BasicJsonType;
json_ref(value_type&& value)
: owned_value(std::move(value)), value_ref(&owned_value), is_rvalue(true)
{}
json_ref(const value_type& value)
: value_ref(const_cast<value_type*>(&value)), is_rvalue(false)
{}
json_ref(std::initializer_list<json_ref> init)
: owned_value(init), value_ref(&owned_value), is_rvalue(true)
{}
template<class... Args>
json_ref(Args&& ... args)
: owned_value(std::forward<Args>(args)...), value_ref(&owned_value), is_rvalue(true)
{}
// class should be movable only
json_ref(json_ref&&) = default;
json_ref(const json_ref&) = delete;
json_ref& operator=(const json_ref&) = delete;
value_type moved_or_copied() const
{
if (is_rvalue)
{
return std::move(*value_ref);
}
return *value_ref;
}
value_type const& operator*() const
{
return *static_cast<value_type const*>(value_ref);
}
value_type const* operator->() const
{
return static_cast<value_type const*>(value_ref);
}
private:
mutable value_type owned_value = nullptr;
value_type* value_ref = nullptr;
const bool is_rvalue;
};
}
}

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#pragma once
#include <ciso646> // not
// This file contains all internal macro definitions
// You MUST include macro_unscope.hpp at the end of json.hpp to undef all of them
// exclude unsupported compilers
#if defined(__clang__)
#if (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__) < 30400
#error "unsupported Clang version - see https://github.com/nlohmann/json#supported-compilers"
#endif
#elif defined(__GNUC__) && !(defined(__ICC) || defined(__INTEL_COMPILER))
#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40900
#error "unsupported GCC version - see https://github.com/nlohmann/json#supported-compilers"
#endif
#endif
// disable float-equal warnings on GCC/clang
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
#endif
// disable documentation warnings on clang
#if defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdocumentation"
#endif
// allow for portable deprecation warnings
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
#define JSON_DEPRECATED __attribute__((deprecated))
#elif defined(_MSC_VER)
#define JSON_DEPRECATED __declspec(deprecated)
#else
#define JSON_DEPRECATED
#endif
// allow to disable exceptions
#if (defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND)) && not defined(JSON_NOEXCEPTION)
#define JSON_THROW(exception) throw exception
#define JSON_TRY try
#define JSON_CATCH(exception) catch(exception)
#else
#define JSON_THROW(exception) std::abort()
#define JSON_TRY if(true)
#define JSON_CATCH(exception) if(false)
#endif
// manual branch prediction
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
#define JSON_LIKELY(x) __builtin_expect(!!(x), 1)
#define JSON_UNLIKELY(x) __builtin_expect(!!(x), 0)
#else
#define JSON_LIKELY(x) x
#define JSON_UNLIKELY(x) x
#endif
// C++ language standard detection
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
#define JSON_HAS_CPP_17
#define JSON_HAS_CPP_14
#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
#define JSON_HAS_CPP_14
#endif
// Ugly macros to avoid uglier copy-paste when specializing basic_json. They
// may be removed in the future once the class is split.
#define NLOHMANN_BASIC_JSON_TPL_DECLARATION \
template<template<typename, typename, typename...> class ObjectType, \
template<typename, typename...> class ArrayType, \
class StringType, class BooleanType, class NumberIntegerType, \
class NumberUnsignedType, class NumberFloatType, \
template<typename> class AllocatorType, \
template<typename, typename = void> class JSONSerializer>
#define NLOHMANN_BASIC_JSON_TPL \
basic_json<ObjectType, ArrayType, StringType, BooleanType, \
NumberIntegerType, NumberUnsignedType, NumberFloatType, \
AllocatorType, JSONSerializer>
/*!
@brief Helper to determine whether there's a key_type for T.
This helper is used to tell associative containers apart from other containers
such as sequence containers. For instance, `std::map` passes the test as it
contains a `mapped_type`, whereas `std::vector` fails the test.
@sa http://stackoverflow.com/a/7728728/266378
@since version 1.0.0, overworked in version 2.0.6
*/
#define NLOHMANN_JSON_HAS_HELPER(type) \
template<typename T> struct has_##type { \
private: \
template<typename U, typename = typename U::type> \
static int detect(U &&); \
static void detect(...); \
public: \
static constexpr bool value = \
std::is_integral<decltype(detect(std::declval<T>()))>::value; \
}

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#pragma once
// restore GCC/clang diagnostic settings
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic pop
#endif
#if defined(__clang__)
#pragma GCC diagnostic pop
#endif
// clean up
#undef JSON_CATCH
#undef JSON_THROW
#undef JSON_TRY
#undef JSON_LIKELY
#undef JSON_UNLIKELY
#undef JSON_DEPRECATED
#undef JSON_HAS_CPP_14
#undef JSON_HAS_CPP_17
#undef NLOHMANN_BASIC_JSON_TPL_DECLARATION
#undef NLOHMANN_BASIC_JSON_TPL
#undef NLOHMANN_JSON_HAS_HELPER

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#pragma once
#include <ciso646> // not
#include <cstddef> // size_t
#include <limits> // numeric_limits
#include <type_traits> // conditional, enable_if, false_type, integral_constant, is_constructible, is_integral, is_same, remove_cv, remove_reference, true_type
#include <utility> // declval
#include "json_fwd.hpp"
#include "detail/macro_scope.hpp"
namespace nlohmann
{
/*!
@brief detail namespace with internal helper functions
This namespace collects functions that should not be exposed,
implementations of some @ref basic_json methods, and meta-programming helpers.
@since version 2.1.0
*/
namespace detail
{
/////////////
// helpers //
/////////////
template<typename> struct is_basic_json : std::false_type {};
NLOHMANN_BASIC_JSON_TPL_DECLARATION
struct is_basic_json<NLOHMANN_BASIC_JSON_TPL> : std::true_type {};
// alias templates to reduce boilerplate
template<bool B, typename T = void>
using enable_if_t = typename std::enable_if<B, T>::type;
template<typename T>
using uncvref_t = typename std::remove_cv<typename std::remove_reference<T>::type>::type;
// implementation of C++14 index_sequence and affiliates
// source: https://stackoverflow.com/a/32223343
template<std::size_t... Ints>
struct index_sequence
{
using type = index_sequence;
using value_type = std::size_t;
static constexpr std::size_t size() noexcept
{
return sizeof...(Ints);
}
};
template<class Sequence1, class Sequence2>
struct merge_and_renumber;
template<std::size_t... I1, std::size_t... I2>
struct merge_and_renumber<index_sequence<I1...>, index_sequence<I2...>>
: index_sequence < I1..., (sizeof...(I1) + I2)... > {};
template<std::size_t N>
struct make_index_sequence
: merge_and_renumber < typename make_index_sequence < N / 2 >::type,
typename make_index_sequence < N - N / 2 >::type > {};
template<> struct make_index_sequence<0> : index_sequence<> {};
template<> struct make_index_sequence<1> : index_sequence<0> {};
template<typename... Ts>
using index_sequence_for = make_index_sequence<sizeof...(Ts)>;
/*
Implementation of two C++17 constructs: conjunction, negation. This is needed
to avoid evaluating all the traits in a condition
For example: not std::is_same<void, T>::value and has_value_type<T>::value
will not compile when T = void (on MSVC at least). Whereas
conjunction<negation<std::is_same<void, T>>, has_value_type<T>>::value will
stop evaluating if negation<...>::value == false
Please note that those constructs must be used with caution, since symbols can
become very long quickly (which can slow down compilation and cause MSVC
internal compiler errors). Only use it when you have to (see example ahead).
*/
template<class...> struct conjunction : std::true_type {};
template<class B1> struct conjunction<B1> : B1 {};
template<class B1, class... Bn>
struct conjunction<B1, Bn...> : std::conditional<bool(B1::value), conjunction<Bn...>, B1>::type {};
template<class B> struct negation : std::integral_constant<bool, not B::value> {};
// dispatch utility (taken from ranges-v3)
template<unsigned N> struct priority_tag : priority_tag < N - 1 > {};
template<> struct priority_tag<0> {};
////////////////////////
// has_/is_ functions //
////////////////////////
NLOHMANN_JSON_HAS_HELPER(mapped_type);
NLOHMANN_JSON_HAS_HELPER(key_type);
NLOHMANN_JSON_HAS_HELPER(value_type);
NLOHMANN_JSON_HAS_HELPER(iterator);
template<bool B, class RealType, class CompatibleObjectType>
struct is_compatible_object_type_impl : std::false_type {};
template<class RealType, class CompatibleObjectType>
struct is_compatible_object_type_impl<true, RealType, CompatibleObjectType>
{
static constexpr auto value =
std::is_constructible<typename RealType::key_type, typename CompatibleObjectType::key_type>::value and
std::is_constructible<typename RealType::mapped_type, typename CompatibleObjectType::mapped_type>::value;
};
template<class BasicJsonType, class CompatibleObjectType>
struct is_compatible_object_type
{
static auto constexpr value = is_compatible_object_type_impl <
conjunction<negation<std::is_same<void, CompatibleObjectType>>,
has_mapped_type<CompatibleObjectType>,
has_key_type<CompatibleObjectType>>::value,
typename BasicJsonType::object_t, CompatibleObjectType >::value;
};
template<typename BasicJsonType, typename T>
struct is_basic_json_nested_type
{
static auto constexpr value = std::is_same<T, typename BasicJsonType::iterator>::value or
std::is_same<T, typename BasicJsonType::const_iterator>::value or
std::is_same<T, typename BasicJsonType::reverse_iterator>::value or
std::is_same<T, typename BasicJsonType::const_reverse_iterator>::value;
};
template<class BasicJsonType, class CompatibleArrayType>
struct is_compatible_array_type
{
static auto constexpr value =
conjunction<negation<std::is_same<void, CompatibleArrayType>>,
negation<is_compatible_object_type<
BasicJsonType, CompatibleArrayType>>,
negation<std::is_constructible<typename BasicJsonType::string_t,
CompatibleArrayType>>,
negation<is_basic_json_nested_type<BasicJsonType, CompatibleArrayType>>,
has_value_type<CompatibleArrayType>,
has_iterator<CompatibleArrayType>>::value;
};
template<bool, typename, typename>
struct is_compatible_integer_type_impl : std::false_type {};
template<typename RealIntegerType, typename CompatibleNumberIntegerType>
struct is_compatible_integer_type_impl<true, RealIntegerType, CompatibleNumberIntegerType>
{
// is there an assert somewhere on overflows?
using RealLimits = std::numeric_limits<RealIntegerType>;
using CompatibleLimits = std::numeric_limits<CompatibleNumberIntegerType>;
static constexpr auto value =
std::is_constructible<RealIntegerType, CompatibleNumberIntegerType>::value and
CompatibleLimits::is_integer and
RealLimits::is_signed == CompatibleLimits::is_signed;
};
template<typename RealIntegerType, typename CompatibleNumberIntegerType>
struct is_compatible_integer_type
{
static constexpr auto value =
is_compatible_integer_type_impl <
std::is_integral<CompatibleNumberIntegerType>::value and
not std::is_same<bool, CompatibleNumberIntegerType>::value,
RealIntegerType, CompatibleNumberIntegerType > ::value;
};
// trait checking if JSONSerializer<T>::from_json(json const&, udt&) exists
template<typename BasicJsonType, typename T>
struct has_from_json
{
private:
// also check the return type of from_json
template<typename U, typename = enable_if_t<std::is_same<void, decltype(uncvref_t<U>::from_json(
std::declval<BasicJsonType>(), std::declval<T&>()))>::value>>
static int detect(U&&);
static void detect(...);
public:
static constexpr bool value = std::is_integral<decltype(
detect(std::declval<typename BasicJsonType::template json_serializer<T, void>>()))>::value;
};
// This trait checks if JSONSerializer<T>::from_json(json const&) exists
// this overload is used for non-default-constructible user-defined-types
template<typename BasicJsonType, typename T>
struct has_non_default_from_json
{
private:
template <
typename U,
typename = enable_if_t<std::is_same<
T, decltype(uncvref_t<U>::from_json(std::declval<BasicJsonType>()))>::value >>
static int detect(U&&);
static void detect(...);
public:
static constexpr bool value = std::is_integral<decltype(detect(
std::declval<typename BasicJsonType::template json_serializer<T, void>>()))>::value;
};
// This trait checks if BasicJsonType::json_serializer<T>::to_json exists
template<typename BasicJsonType, typename T>
struct has_to_json
{
private:
template<typename U, typename = decltype(uncvref_t<U>::to_json(
std::declval<BasicJsonType&>(), std::declval<T>()))>
static int detect(U&&);
static void detect(...);
public:
static constexpr bool value = std::is_integral<decltype(detect(
std::declval<typename BasicJsonType::template json_serializer<T, void>>()))>::value;
};
// taken from ranges-v3
template<typename T>
struct static_const
{
static constexpr T value{};
};
template<typename T>
constexpr T static_const<T>::value;
}
}

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#pragma once
#include <algorithm> // reverse
#include <array> // array
#include <cstdint> // uint8_t, uint16_t, uint32_t, uint64_t
#include <cstring> // memcpy
#include <limits> // numeric_limits
#include "detail/parsing/binary_reader.hpp"
#include "detail/parsing/output_adapters.hpp"
namespace nlohmann
{
namespace detail
{
///////////////////
// binary writer //
///////////////////
/*!
@brief serialization to CBOR and MessagePack values
*/
template<typename BasicJsonType, typename CharType>
class binary_writer
{
public:
/*!
@brief create a binary writer
@param[in] adapter output adapter to write to
*/
explicit binary_writer(output_adapter_t<CharType> adapter) : oa(adapter)
{
assert(oa);
}
/*!
@brief[in] j JSON value to serialize
*/
void write_cbor(const BasicJsonType& j)
{
switch (j.type())
{
case value_t::null:
{
oa->write_character(static_cast<CharType>(0xF6));
break;
}
case value_t::boolean:
{
oa->write_character(j.m_value.boolean
? static_cast<CharType>(0xF5)
: static_cast<CharType>(0xF4));
break;
}
case value_t::number_integer:
{
if (j.m_value.number_integer >= 0)
{
// CBOR does not differentiate between positive signed
// integers and unsigned integers. Therefore, we used the
// code from the value_t::number_unsigned case here.
if (j.m_value.number_integer <= 0x17)
{
write_number(static_cast<uint8_t>(j.m_value.number_integer));
}
else if (j.m_value.number_integer <= (std::numeric_limits<uint8_t>::max)())
{
oa->write_character(static_cast<CharType>(0x18));
write_number(static_cast<uint8_t>(j.m_value.number_integer));
}
else if (j.m_value.number_integer <= (std::numeric_limits<uint16_t>::max)())
{
oa->write_character(static_cast<CharType>(0x19));
write_number(static_cast<uint16_t>(j.m_value.number_integer));
}
else if (j.m_value.number_integer <= (std::numeric_limits<uint32_t>::max)())
{
oa->write_character(static_cast<CharType>(0x1A));
write_number(static_cast<uint32_t>(j.m_value.number_integer));
}
else
{
oa->write_character(static_cast<CharType>(0x1B));
write_number(static_cast<uint64_t>(j.m_value.number_integer));
}
}
else
{
// The conversions below encode the sign in the first
// byte, and the value is converted to a positive number.
const auto positive_number = -1 - j.m_value.number_integer;
if (j.m_value.number_integer >= -24)
{
write_number(static_cast<uint8_t>(0x20 + positive_number));
}
else if (positive_number <= (std::numeric_limits<uint8_t>::max)())
{
oa->write_character(static_cast<CharType>(0x38));
write_number(static_cast<uint8_t>(positive_number));
}
else if (positive_number <= (std::numeric_limits<uint16_t>::max)())
{
oa->write_character(static_cast<CharType>(0x39));
write_number(static_cast<uint16_t>(positive_number));
}
else if (positive_number <= (std::numeric_limits<uint32_t>::max)())
{
oa->write_character(static_cast<CharType>(0x3A));
write_number(static_cast<uint32_t>(positive_number));
}
else
{
oa->write_character(static_cast<CharType>(0x3B));
write_number(static_cast<uint64_t>(positive_number));
}
}
break;
}
case value_t::number_unsigned:
{
if (j.m_value.number_unsigned <= 0x17)
{
write_number(static_cast<uint8_t>(j.m_value.number_unsigned));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint8_t>::max)())
{
oa->write_character(static_cast<CharType>(0x18));
write_number(static_cast<uint8_t>(j.m_value.number_unsigned));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint16_t>::max)())
{
oa->write_character(static_cast<CharType>(0x19));
write_number(static_cast<uint16_t>(j.m_value.number_unsigned));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint32_t>::max)())
{
oa->write_character(static_cast<CharType>(0x1A));
write_number(static_cast<uint32_t>(j.m_value.number_unsigned));
}
else
{
oa->write_character(static_cast<CharType>(0x1B));
write_number(static_cast<uint64_t>(j.m_value.number_unsigned));
}
break;
}
case value_t::number_float: // Double-Precision Float
{
oa->write_character(static_cast<CharType>(0xFB));
write_number(j.m_value.number_float);
break;
}
case value_t::string:
{
// step 1: write control byte and the string length
const auto N = j.m_value.string->size();
if (N <= 0x17)
{
write_number(static_cast<uint8_t>(0x60 + N));
}
else if (N <= 0xFF)
{
oa->write_character(static_cast<CharType>(0x78));
write_number(static_cast<uint8_t>(N));
}
else if (N <= 0xFFFF)
{
oa->write_character(static_cast<CharType>(0x79));
write_number(static_cast<uint16_t>(N));
}
else if (N <= 0xFFFFFFFF)
{
oa->write_character(static_cast<CharType>(0x7A));
write_number(static_cast<uint32_t>(N));
}
// LCOV_EXCL_START
else if (N <= 0xFFFFFFFFFFFFFFFF)
{
oa->write_character(static_cast<CharType>(0x7B));
write_number(static_cast<uint64_t>(N));
}
// LCOV_EXCL_STOP
// step 2: write the string
oa->write_characters(
reinterpret_cast<const CharType*>(j.m_value.string->c_str()),
j.m_value.string->size());
break;
}
case value_t::array:
{
// step 1: write control byte and the array size
const auto N = j.m_value.array->size();
if (N <= 0x17)
{
write_number(static_cast<uint8_t>(0x80 + N));
}
else if (N <= 0xFF)
{
oa->write_character(static_cast<CharType>(0x98));
write_number(static_cast<uint8_t>(N));
}
else if (N <= 0xFFFF)
{
oa->write_character(static_cast<CharType>(0x99));
write_number(static_cast<uint16_t>(N));
}
else if (N <= 0xFFFFFFFF)
{
oa->write_character(static_cast<CharType>(0x9A));
write_number(static_cast<uint32_t>(N));
}
// LCOV_EXCL_START
else if (N <= 0xFFFFFFFFFFFFFFFF)
{
oa->write_character(static_cast<CharType>(0x9B));
write_number(static_cast<uint64_t>(N));
}
// LCOV_EXCL_STOP
// step 2: write each element
for (const auto& el : *j.m_value.array)
{
write_cbor(el);
}
break;
}
case value_t::object:
{
// step 1: write control byte and the object size
const auto N = j.m_value.object->size();
if (N <= 0x17)
{
write_number(static_cast<uint8_t>(0xA0 + N));
}
else if (N <= 0xFF)
{
oa->write_character(static_cast<CharType>(0xB8));
write_number(static_cast<uint8_t>(N));
}
else if (N <= 0xFFFF)
{
oa->write_character(static_cast<CharType>(0xB9));
write_number(static_cast<uint16_t>(N));
}
else if (N <= 0xFFFFFFFF)
{
oa->write_character(static_cast<CharType>(0xBA));
write_number(static_cast<uint32_t>(N));
}
// LCOV_EXCL_START
else if (N <= 0xFFFFFFFFFFFFFFFF)
{
oa->write_character(static_cast<CharType>(0xBB));
write_number(static_cast<uint64_t>(N));
}
// LCOV_EXCL_STOP
// step 2: write each element
for (const auto& el : *j.m_value.object)
{
write_cbor(el.first);
write_cbor(el.second);
}
break;
}
default:
break;
}
}
/*!
@brief[in] j JSON value to serialize
*/
void write_msgpack(const BasicJsonType& j)
{
switch (j.type())
{
case value_t::null: // nil
{
oa->write_character(static_cast<CharType>(0xC0));
break;
}
case value_t::boolean: // true and false
{
oa->write_character(j.m_value.boolean
? static_cast<CharType>(0xC3)
: static_cast<CharType>(0xC2));
break;
}
case value_t::number_integer:
{
if (j.m_value.number_integer >= 0)
{
// MessagePack does not differentiate between positive
// signed integers and unsigned integers. Therefore, we used
// the code from the value_t::number_unsigned case here.
if (j.m_value.number_unsigned < 128)
{
// positive fixnum
write_number(static_cast<uint8_t>(j.m_value.number_integer));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint8_t>::max)())
{
// uint 8
oa->write_character(static_cast<CharType>(0xCC));
write_number(static_cast<uint8_t>(j.m_value.number_integer));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint16_t>::max)())
{
// uint 16
oa->write_character(static_cast<CharType>(0xCD));
write_number(static_cast<uint16_t>(j.m_value.number_integer));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint32_t>::max)())
{
// uint 32
oa->write_character(static_cast<CharType>(0xCE));
write_number(static_cast<uint32_t>(j.m_value.number_integer));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint64_t>::max)())
{
// uint 64
oa->write_character(static_cast<CharType>(0xCF));
write_number(static_cast<uint64_t>(j.m_value.number_integer));
}
}
else
{
if (j.m_value.number_integer >= -32)
{
// negative fixnum
write_number(static_cast<int8_t>(j.m_value.number_integer));
}
else if (j.m_value.number_integer >= (std::numeric_limits<int8_t>::min)() and
j.m_value.number_integer <= (std::numeric_limits<int8_t>::max)())
{
// int 8
oa->write_character(static_cast<CharType>(0xD0));
write_number(static_cast<int8_t>(j.m_value.number_integer));
}
else if (j.m_value.number_integer >= (std::numeric_limits<int16_t>::min)() and
j.m_value.number_integer <= (std::numeric_limits<int16_t>::max)())
{
// int 16
oa->write_character(static_cast<CharType>(0xD1));
write_number(static_cast<int16_t>(j.m_value.number_integer));
}
else if (j.m_value.number_integer >= (std::numeric_limits<int32_t>::min)() and
j.m_value.number_integer <= (std::numeric_limits<int32_t>::max)())
{
// int 32
oa->write_character(static_cast<CharType>(0xD2));
write_number(static_cast<int32_t>(j.m_value.number_integer));
}
else if (j.m_value.number_integer >= (std::numeric_limits<int64_t>::min)() and
j.m_value.number_integer <= (std::numeric_limits<int64_t>::max)())
{
// int 64
oa->write_character(static_cast<CharType>(0xD3));
write_number(static_cast<int64_t>(j.m_value.number_integer));
}
}
break;
}
case value_t::number_unsigned:
{
if (j.m_value.number_unsigned < 128)
{
// positive fixnum
write_number(static_cast<uint8_t>(j.m_value.number_integer));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint8_t>::max)())
{
// uint 8
oa->write_character(static_cast<CharType>(0xCC));
write_number(static_cast<uint8_t>(j.m_value.number_integer));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint16_t>::max)())
{
// uint 16
oa->write_character(static_cast<CharType>(0xCD));
write_number(static_cast<uint16_t>(j.m_value.number_integer));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint32_t>::max)())
{
// uint 32
oa->write_character(static_cast<CharType>(0xCE));
write_number(static_cast<uint32_t>(j.m_value.number_integer));
}
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint64_t>::max)())
{
// uint 64
oa->write_character(static_cast<CharType>(0xCF));
write_number(static_cast<uint64_t>(j.m_value.number_integer));
}
break;
}
case value_t::number_float: // float 64
{
oa->write_character(static_cast<CharType>(0xCB));
write_number(j.m_value.number_float);
break;
}
case value_t::string:
{
// step 1: write control byte and the string length
const auto N = j.m_value.string->size();
if (N <= 31)
{
// fixstr
write_number(static_cast<uint8_t>(0xA0 | N));
}
else if (N <= 255)
{
// str 8
oa->write_character(static_cast<CharType>(0xD9));
write_number(static_cast<uint8_t>(N));
}
else if (N <= 65535)
{
// str 16
oa->write_character(static_cast<CharType>(0xDA));
write_number(static_cast<uint16_t>(N));
}
else if (N <= 4294967295)
{
// str 32
oa->write_character(static_cast<CharType>(0xDB));
write_number(static_cast<uint32_t>(N));
}
// step 2: write the string
oa->write_characters(
reinterpret_cast<const CharType*>(j.m_value.string->c_str()),
j.m_value.string->size());
break;
}
case value_t::array:
{
// step 1: write control byte and the array size
const auto N = j.m_value.array->size();
if (N <= 15)
{
// fixarray
write_number(static_cast<uint8_t>(0x90 | N));
}
else if (N <= 0xFFFF)
{
// array 16
oa->write_character(static_cast<CharType>(0xDC));
write_number(static_cast<uint16_t>(N));
}
else if (N <= 0xFFFFFFFF)
{
// array 32
oa->write_character(static_cast<CharType>(0xDD));
write_number(static_cast<uint32_t>(N));
}
// step 2: write each element
for (const auto& el : *j.m_value.array)
{
write_msgpack(el);
}
break;
}
case value_t::object:
{
// step 1: write control byte and the object size
const auto N = j.m_value.object->size();
if (N <= 15)
{
// fixmap
write_number(static_cast<uint8_t>(0x80 | (N & 0xF)));
}
else if (N <= 65535)
{
// map 16
oa->write_character(static_cast<CharType>(0xDE));
write_number(static_cast<uint16_t>(N));
}
else if (N <= 4294967295)
{
// map 32
oa->write_character(static_cast<CharType>(0xDF));
write_number(static_cast<uint32_t>(N));
}
// step 2: write each element
for (const auto& el : *j.m_value.object)
{
write_msgpack(el.first);
write_msgpack(el.second);
}
break;
}
default:
break;
}
}
private:
/*
@brief write a number to output input
@param[in] n number of type @a NumberType
@tparam NumberType the type of the number
@note This function needs to respect the system's endianess, because bytes
in CBOR and MessagePack are stored in network order (big endian) and
therefore need reordering on little endian systems.
*/
template<typename NumberType> void write_number(NumberType n)
{
// step 1: write number to array of length NumberType
std::array<CharType, sizeof(NumberType)> vec;
std::memcpy(vec.data(), &n, sizeof(NumberType));
// step 2: write array to output (with possible reordering)
if (is_little_endian)
{
// reverse byte order prior to conversion if necessary
std::reverse(vec.begin(), vec.end());
}
oa->write_characters(vec.data(), sizeof(NumberType));
}
private:
/// whether we can assume little endianess
const bool is_little_endian = binary_reader<BasicJsonType>::little_endianess();
/// the output
output_adapter_t<CharType> oa = nullptr;
};
}
}

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#pragma once
#include <algorithm> // min
#include <array> // array
#include <cassert> // assert
#include <cstddef> // size_t
#include <cstring> // strlen
#include <ios> // streamsize, streamoff, streampos
#include <istream> // istream
#include <iterator> // begin, end, iterator_traits, random_access_iterator_tag, distance, next
#include <memory> // shared_ptr, make_shared, addressof
#include <numeric> // accumulate
#include <string> // string, char_traits
#include <type_traits> // enable_if, is_base_of, is_pointer, is_integral, remove_pointer
#include <utility> // pair, declval
#include "detail/macro_scope.hpp"
namespace nlohmann
{
namespace detail
{
////////////////////
// input adapters //
////////////////////
/*!
@brief abstract input adapter interface
Produces a stream of std::char_traits<char>::int_type characters from a
std::istream, a buffer, or some other input type. Accepts the return of exactly
one non-EOF character for future input. The int_type characters returned
consist of all valid char values as positive values (typically unsigned char),
plus an EOF value outside that range, specified by the value of the function
std::char_traits<char>::eof(). This value is typically -1, but could be any
arbitrary value which is not a valid char value.
*/
struct input_adapter_protocol
{
/// get a character [0,255] or std::char_traits<char>::eof().
virtual std::char_traits<char>::int_type get_character() = 0;
/// restore the last non-eof() character to input
virtual void unget_character() = 0;
virtual ~input_adapter_protocol() = default;
};
/// a type to simplify interfaces
using input_adapter_t = std::shared_ptr<input_adapter_protocol>;
/*!
Input adapter for a (caching) istream. Ignores a UFT Byte Order Mark at
beginning of input. Does not support changing the underlying std::streambuf
in mid-input. Maintains underlying std::istream and std::streambuf to support
subsequent use of standard std::istream operations to process any input
characters following those used in parsing the JSON input. Clears the
std::istream flags; any input errors (e.g., EOF) will be detected by the first
subsequent call for input from the std::istream.
*/
class input_stream_adapter : public input_adapter_protocol
{
public:
~input_stream_adapter() override
{
// clear stream flags; we use underlying streambuf I/O, do not
// maintain ifstream flags
is.clear();
}
explicit input_stream_adapter(std::istream& i)
: is(i), sb(*i.rdbuf())
{
// skip byte order mark
std::char_traits<char>::int_type c;
if ((c = get_character()) == 0xEF)
{
if ((c = get_character()) == 0xBB)
{
if ((c = get_character()) == 0xBF)
{
return; // Ignore BOM
}
else if (c != std::char_traits<char>::eof())
{
is.unget();
}
is.putback('\xBB');
}
else if (c != std::char_traits<char>::eof())
{
is.unget();
}
is.putback('\xEF');
}
else if (c != std::char_traits<char>::eof())
{
is.unget(); // no byte order mark; process as usual
}
}
// delete because of pointer members
input_stream_adapter(const input_stream_adapter&) = delete;
input_stream_adapter& operator=(input_stream_adapter&) = delete;
// std::istream/std::streambuf use std::char_traits<char>::to_int_type, to
// ensure that std::char_traits<char>::eof() and the character 0xFF do not
// end up as the same value, eg. 0xFFFFFFFF.
std::char_traits<char>::int_type get_character() override
{
return sb.sbumpc();
}
void unget_character() override
{
sb.sungetc(); // is.unget() avoided for performance
}
private:
/// the associated input stream
std::istream& is;
std::streambuf& sb;
};
/// input adapter for buffer input
class input_buffer_adapter : public input_adapter_protocol
{
public:
input_buffer_adapter(const char* b, const std::size_t l)
: cursor(b), limit(b + l), start(b)
{
// skip byte order mark
if (l >= 3 and b[0] == '\xEF' and b[1] == '\xBB' and b[2] == '\xBF')
{
cursor += 3;
}
}
// delete because of pointer members
input_buffer_adapter(const input_buffer_adapter&) = delete;
input_buffer_adapter& operator=(input_buffer_adapter&) = delete;
std::char_traits<char>::int_type get_character() noexcept override
{
if (JSON_LIKELY(cursor < limit))
{
return std::char_traits<char>::to_int_type(*(cursor++));
}
return std::char_traits<char>::eof();
}
void unget_character() noexcept override
{
if (JSON_LIKELY(cursor > start))
{
--cursor;
}
}
private:
/// pointer to the current character
const char* cursor;
/// pointer past the last character
const char* limit;
/// pointer to the first character
const char* start;
};
class input_adapter
{
public:
// native support
/// input adapter for input stream
input_adapter(std::istream& i)
: ia(std::make_shared<input_stream_adapter>(i)) {}
/// input adapter for input stream
input_adapter(std::istream&& i)
: ia(std::make_shared<input_stream_adapter>(i)) {}
/// input adapter for buffer
template<typename CharT,
typename std::enable_if<
std::is_pointer<CharT>::value and
std::is_integral<typename std::remove_pointer<CharT>::type>::value and
sizeof(typename std::remove_pointer<CharT>::type) == 1,
int>::type = 0>
input_adapter(CharT b, std::size_t l)
: ia(std::make_shared<input_buffer_adapter>(reinterpret_cast<const char*>(b), l)) {}
// derived support
/// input adapter for string literal
template<typename CharT,
typename std::enable_if<
std::is_pointer<CharT>::value and
std::is_integral<typename std::remove_pointer<CharT>::type>::value and
sizeof(typename std::remove_pointer<CharT>::type) == 1,
int>::type = 0>
input_adapter(CharT b)
: input_adapter(reinterpret_cast<const char*>(b),
std::strlen(reinterpret_cast<const char*>(b))) {}
/// input adapter for iterator range with contiguous storage
template<class IteratorType,
typename std::enable_if<
std::is_same<typename std::iterator_traits<IteratorType>::iterator_category, std::random_access_iterator_tag>::value,
int>::type = 0>
input_adapter(IteratorType first, IteratorType last)
{
// assertion to check that the iterator range is indeed contiguous,
// see http://stackoverflow.com/a/35008842/266378 for more discussion
assert(std::accumulate(
first, last, std::pair<bool, int>(true, 0),
[&first](std::pair<bool, int> res, decltype(*first) val)
{
res.first &= (val == *(std::next(std::addressof(*first), res.second++)));
return res;
}).first);
// assertion to check that each element is 1 byte long
static_assert(
sizeof(typename std::iterator_traits<IteratorType>::value_type) == 1,
"each element in the iterator range must have the size of 1 byte");
const auto len = static_cast<size_t>(std::distance(first, last));
if (JSON_LIKELY(len > 0))
{
// there is at least one element: use the address of first
ia = std::make_shared<input_buffer_adapter>(reinterpret_cast<const char*>(&(*first)), len);
}
else
{
// the address of first cannot be used: use nullptr
ia = std::make_shared<input_buffer_adapter>(nullptr, len);
}
}
/// input adapter for array
template<class T, std::size_t N>
input_adapter(T (&array)[N])
: input_adapter(std::begin(array), std::end(array)) {}
/// input adapter for contiguous container
template<class ContiguousContainer, typename
std::enable_if<not std::is_pointer<ContiguousContainer>::value and
std::is_base_of<std::random_access_iterator_tag, typename std::iterator_traits<decltype(std::begin(std::declval<ContiguousContainer const>()))>::iterator_category>::value,
int>::type = 0>
input_adapter(const ContiguousContainer& c)
: input_adapter(std::begin(c), std::end(c)) {}
operator input_adapter_t()
{
return ia;
}
private:
/// the actual adapter
input_adapter_t ia = nullptr;
};
}
}

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#pragma once
#include <algorithm> // copy
#include <cstddef> // size_t
#include <ios> // streamsize
#include <iterator> // back_inserter
#include <memory> // shared_ptr, make_shared
#include <ostream> // basic_ostream
#include <string> // basic_string
#include <vector> // vector
namespace nlohmann
{
namespace detail
{
/// abstract output adapter interface
template<typename CharType> struct output_adapter_protocol
{
virtual void write_character(CharType c) = 0;
virtual void write_characters(const CharType* s, std::size_t length) = 0;
virtual ~output_adapter_protocol() = default;
};
/// a type to simplify interfaces
template<typename CharType>
using output_adapter_t = std::shared_ptr<output_adapter_protocol<CharType>>;
/// output adapter for byte vectors
template<typename CharType>
class output_vector_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_vector_adapter(std::vector<CharType>& vec) : v(vec) {}
void write_character(CharType c) override
{
v.push_back(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
std::copy(s, s + length, std::back_inserter(v));
}
private:
std::vector<CharType>& v;
};
/// output adapter for output streams
template<typename CharType>
class output_stream_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_stream_adapter(std::basic_ostream<CharType>& s) : stream(s) {}
void write_character(CharType c) override
{
stream.put(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
stream.write(s, static_cast<std::streamsize>(length));
}
private:
std::basic_ostream<CharType>& stream;
};
/// output adapter for basic_string
template<typename CharType>
class output_string_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_string_adapter(std::basic_string<CharType>& s) : str(s) {}
void write_character(CharType c) override
{
str.push_back(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
str.append(s, length);
}
private:
std::basic_string<CharType>& str;
};
template<typename CharType>
class output_adapter
{
public:
output_adapter(std::vector<CharType>& vec)
: oa(std::make_shared<output_vector_adapter<CharType>>(vec)) {}
output_adapter(std::basic_ostream<CharType>& s)
: oa(std::make_shared<output_stream_adapter<CharType>>(s)) {}
output_adapter(std::basic_string<CharType>& s)
: oa(std::make_shared<output_string_adapter<CharType>>(s)) {}
operator output_adapter_t<CharType>()
{
return oa;
}
private:
output_adapter_t<CharType> oa = nullptr;
};
}
}

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#pragma once
#include <cassert> // assert
#include <cmath> // isfinite
#include <cstdint> // uint8_t
#include <functional> // function
#include <string> // string
#include <utility> // move
#include "detail/exceptions.hpp"
#include "detail/macro_scope.hpp"
#include "detail/parsing/input_adapters.hpp"
#include "detail/parsing/lexer.hpp"
#include "detail/value_t.hpp"
namespace nlohmann
{
namespace detail
{
////////////
// parser //
////////////
/*!
@brief syntax analysis
This class implements a recursive decent parser.
*/
template<typename BasicJsonType>
class parser
{
using number_integer_t = typename BasicJsonType::number_integer_t;
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
using number_float_t = typename BasicJsonType::number_float_t;
using lexer_t = lexer<BasicJsonType>;
using token_type = typename lexer_t::token_type;
public:
enum class parse_event_t : uint8_t
{
/// the parser read `{` and started to process a JSON object
object_start,
/// the parser read `}` and finished processing a JSON object
object_end,
/// the parser read `[` and started to process a JSON array
array_start,
/// the parser read `]` and finished processing a JSON array
array_end,
/// the parser read a key of a value in an object
key,
/// the parser finished reading a JSON value
value
};
using parser_callback_t =
std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;
/// a parser reading from an input adapter
explicit parser(detail::input_adapter_t adapter,
const parser_callback_t cb = nullptr,
const bool allow_exceptions_ = true)
: callback(cb), m_lexer(adapter), allow_exceptions(allow_exceptions_)
{}
/*!
@brief public parser interface
@param[in] strict whether to expect the last token to be EOF
@param[in,out] result parsed JSON value
@throw parse_error.101 in case of an unexpected token
@throw parse_error.102 if to_unicode fails or surrogate error
@throw parse_error.103 if to_unicode fails
*/
void parse(const bool strict, BasicJsonType& result)
{
// read first token
get_token();
parse_internal(true, result);
result.assert_invariant();
// in strict mode, input must be completely read
if (strict)
{
get_token();
expect(token_type::end_of_input);
}
// in case of an error, return discarded value
if (errored)
{
result = value_t::discarded;
return;
}
// set top-level value to null if it was discarded by the callback
// function
if (result.is_discarded())
{
result = nullptr;
}
}
/*!
@brief public accept interface
@param[in] strict whether to expect the last token to be EOF
@return whether the input is a proper JSON text
*/
bool accept(const bool strict = true)
{
// read first token
get_token();
if (not accept_internal())
{
return false;
}
// strict => last token must be EOF
return not strict or (get_token() == token_type::end_of_input);
}
private:
/*!
@brief the actual parser
@throw parse_error.101 in case of an unexpected token
@throw parse_error.102 if to_unicode fails or surrogate error
@throw parse_error.103 if to_unicode fails
*/
void parse_internal(bool keep, BasicJsonType& result)
{
// never parse after a parse error was detected
assert(not errored);
// start with a discarded value
if (not result.is_discarded())
{
result.m_value.destroy(result.m_type);
result.m_type = value_t::discarded;
}
switch (last_token)
{
case token_type::begin_object:
{
if (keep)
{
if (callback)
{
keep = callback(depth++, parse_event_t::object_start, result);
}
if (not callback or keep)
{
// explicitly set result to object to cope with {}
result.m_type = value_t::object;
result.m_value = value_t::object;
}
}
// read next token
get_token();
// closing } -> we are done
if (last_token == token_type::end_object)
{
if (keep and callback and not callback(--depth, parse_event_t::object_end, result))
{
result.m_value.destroy(result.m_type);
result.m_type = value_t::discarded;
}
break;
}
// parse values
std::string key;
BasicJsonType value;
while (true)
{
// store key
if (not expect(token_type::value_string))
{
return;
}
key = m_lexer.move_string();
bool keep_tag = false;
if (keep)
{
if (callback)
{
BasicJsonType k(key);
keep_tag = callback(depth, parse_event_t::key, k);
}
else
{
keep_tag = true;
}
}
// parse separator (:)
get_token();
if (not expect(token_type::name_separator))
{
return;
}
// parse and add value
get_token();
value.m_value.destroy(value.m_type);
value.m_type = value_t::discarded;
parse_internal(keep, value);
if (JSON_UNLIKELY(errored))
{
return;
}
if (keep and keep_tag and not value.is_discarded())
{
result.m_value.object->emplace(std::move(key), std::move(value));
}
// comma -> next value
get_token();
if (last_token == token_type::value_separator)
{
get_token();
continue;
}
// closing }
if (not expect(token_type::end_object))
{
return;
}
break;
}
if (keep and callback and not callback(--depth, parse_event_t::object_end, result))
{
result.m_value.destroy(result.m_type);
result.m_type = value_t::discarded;
}
break;
}
case token_type::begin_array:
{
if (keep)
{
if (callback)
{
keep = callback(depth++, parse_event_t::array_start, result);
}
if (not callback or keep)
{
// explicitly set result to array to cope with []
result.m_type = value_t::array;
result.m_value = value_t::array;
}
}
// read next token
get_token();
// closing ] -> we are done
if (last_token == token_type::end_array)
{
if (callback and not callback(--depth, parse_event_t::array_end, result))
{
result.m_value.destroy(result.m_type);
result.m_type = value_t::discarded;
}
break;
}
// parse values
BasicJsonType value;
while (true)
{
// parse value
value.m_value.destroy(value.m_type);
value.m_type = value_t::discarded;
parse_internal(keep, value);
if (JSON_UNLIKELY(errored))
{
return;
}
if (keep and not value.is_discarded())
{
result.m_value.array->push_back(std::move(value));
}
// comma -> next value
get_token();
if (last_token == token_type::value_separator)
{
get_token();
continue;
}
// closing ]
if (not expect(token_type::end_array))
{
return;
}
break;
}
if (keep and callback and not callback(--depth, parse_event_t::array_end, result))
{
result.m_value.destroy(result.m_type);
result.m_type = value_t::discarded;
}
break;
}
case token_type::literal_null:
{
result.m_type = value_t::null;
break;
}
case token_type::value_string:
{
result.m_type = value_t::string;
result.m_value = m_lexer.move_string();
break;
}
case token_type::literal_true:
{
result.m_type = value_t::boolean;
result.m_value = true;
break;
}
case token_type::literal_false:
{
result.m_type = value_t::boolean;
result.m_value = false;
break;
}
case token_type::value_unsigned:
{
result.m_type = value_t::number_unsigned;
result.m_value = m_lexer.get_number_unsigned();
break;
}
case token_type::value_integer:
{
result.m_type = value_t::number_integer;
result.m_value = m_lexer.get_number_integer();
break;
}
case token_type::value_float:
{
result.m_type = value_t::number_float;
result.m_value = m_lexer.get_number_float();
// throw in case of infinity or NAN
if (JSON_UNLIKELY(not std::isfinite(result.m_value.number_float)))
{
if (allow_exceptions)
{
JSON_THROW(out_of_range::create(406, "number overflow parsing '" +
m_lexer.get_token_string() + "'"));
}
expect(token_type::uninitialized);
}
break;
}
case token_type::parse_error:
{
// using "uninitialized" to avoid "expected" message
if (not expect(token_type::uninitialized))
{
return;
}
break; // LCOV_EXCL_LINE
}
default:
{
// the last token was unexpected; we expected a value
if (not expect(token_type::literal_or_value))
{
return;
}
break; // LCOV_EXCL_LINE
}
}
if (keep and callback and not callback(depth, parse_event_t::value, result))
{
result.m_type = value_t::discarded;
}
}
/*!
@brief the actual acceptor
@invariant 1. The last token is not yet processed. Therefore, the caller
of this function must make sure a token has been read.
2. When this function returns, the last token is processed.
That is, the last read character was already considered.
This invariant makes sure that no token needs to be "unput".
*/
bool accept_internal()
{
switch (last_token)
{
case token_type::begin_object:
{
// read next token
get_token();
// closing } -> we are done
if (last_token == token_type::end_object)
{
return true;
}
// parse values
while (true)
{
// parse key
if (last_token != token_type::value_string)
{
return false;
}
// parse separator (:)
get_token();
if (last_token != token_type::name_separator)
{
return false;
}
// parse value
get_token();
if (not accept_internal())
{
return false;
}
// comma -> next value
get_token();
if (last_token == token_type::value_separator)
{
get_token();
continue;
}
// closing }
return (last_token == token_type::end_object);
}
}
case token_type::begin_array:
{
// read next token
get_token();
// closing ] -> we are done
if (last_token == token_type::end_array)
{
return true;
}
// parse values
while (true)
{
// parse value
if (not accept_internal())
{
return false;
}
// comma -> next value
get_token();
if (last_token == token_type::value_separator)
{
get_token();
continue;
}
// closing ]
return (last_token == token_type::end_array);
}
}
case token_type::value_float:
{
// reject infinity or NAN
return std::isfinite(m_lexer.get_number_float());
}
case token_type::literal_false:
case token_type::literal_null:
case token_type::literal_true:
case token_type::value_integer:
case token_type::value_string:
case token_type::value_unsigned:
return true;
default: // the last token was unexpected
return false;
}
}
/// get next token from lexer
token_type get_token()
{
return (last_token = m_lexer.scan());
}
/*!
@throw parse_error.101 if expected token did not occur
*/
bool expect(token_type t)
{
if (JSON_UNLIKELY(t != last_token))
{
errored = true;
expected = t;
if (allow_exceptions)
{
throw_exception();
}
else
{
return false;
}
}
return true;
}
[[noreturn]] void throw_exception() const
{
std::string error_msg = "syntax error - ";
if (last_token == token_type::parse_error)
{
error_msg += std::string(m_lexer.get_error_message()) + "; last read: '" +
m_lexer.get_token_string() + "'";
}
else
{
error_msg += "unexpected " + std::string(lexer_t::token_type_name(last_token));
}
if (expected != token_type::uninitialized)
{
error_msg += "; expected " + std::string(lexer_t::token_type_name(expected));
}
JSON_THROW(parse_error::create(101, m_lexer.get_position(), error_msg));
}
private:
/// current level of recursion
int depth = 0;
/// callback function
const parser_callback_t callback = nullptr;
/// the type of the last read token
token_type last_token = token_type::uninitialized;
/// the lexer
lexer_t m_lexer;
/// whether a syntax error occurred
bool errored = false;
/// possible reason for the syntax error
token_type expected = token_type::uninitialized;
/// whether to throw exceptions in case of errors
const bool allow_exceptions = true;
};
}
}

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#pragma once
#include <algorithm> // reverse, remove, fill, find, none_of
#include <array> // array
#include <cassert> // assert
#include <ciso646> // and, or
#include <clocale> // localeconv, lconv
#include <cmath> // labs, isfinite, isnan, signbit
#include <cstddef> // size_t, ptrdiff_t
#include <cstdint> // uint8_t
#include <cstdio> // snprintf
#include <iterator> // next
#include <limits> // numeric_limits
#include <string> // string
#include <type_traits> // is_same
#include "detail/macro_scope.hpp"
#include "detail/meta.hpp"
#include "detail/parsing/output_adapters.hpp"
#include "detail/value_t.hpp"
namespace nlohmann
{
namespace detail
{
///////////////////
// serialization //
///////////////////
template<typename BasicJsonType>
class serializer
{
using string_t = typename BasicJsonType::string_t;
using number_float_t = typename BasicJsonType::number_float_t;
using number_integer_t = typename BasicJsonType::number_integer_t;
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
public:
/*!
@param[in] s output stream to serialize to
@param[in] ichar indentation character to use
*/
serializer(output_adapter_t<char> s, const char ichar)
: o(std::move(s)), loc(std::localeconv()),
thousands_sep(loc->thousands_sep == nullptr ? '\0' : * (loc->thousands_sep)),
decimal_point(loc->decimal_point == nullptr ? '\0' : * (loc->decimal_point)),
indent_char(ichar), indent_string(512, indent_char) {}
// delete because of pointer members
serializer(const serializer&) = delete;
serializer& operator=(const serializer&) = delete;
/*!
@brief internal implementation of the serialization function
This function is called by the public member function dump and organizes
the serialization internally. The indentation level is propagated as
additional parameter. In case of arrays and objects, the function is
called recursively.
- strings and object keys are escaped using `escape_string()`
- integer numbers are converted implicitly via `operator<<`
- floating-point numbers are converted to a string using `"%g"` format
@param[in] val value to serialize
@param[in] pretty_print whether the output shall be pretty-printed
@param[in] indent_step the indent level
@param[in] current_indent the current indent level (only used internally)
*/
void dump(const BasicJsonType& val, const bool pretty_print,
const bool ensure_ascii,
const unsigned int indent_step,
const unsigned int current_indent = 0)
{
switch (val.m_type)
{
case value_t::object:
{
if (val.m_value.object->empty())
{
o->write_characters("{}", 2);
return;
}
if (pretty_print)
{
o->write_characters("{\n", 2);
// variable to hold indentation for recursive calls
const auto new_indent = current_indent + indent_step;
if (JSON_UNLIKELY(indent_string.size() < new_indent))
{
indent_string.resize(indent_string.size() * 2, ' ');
}
// first n-1 elements
auto i = val.m_value.object->cbegin();
for (std::size_t cnt = 0; cnt < val.m_value.object->size() - 1; ++cnt, ++i)
{
o->write_characters(indent_string.c_str(), new_indent);
o->write_character('\"');
dump_escaped(i->first, ensure_ascii);
o->write_characters("\": ", 3);
dump(i->second, true, ensure_ascii, indent_step, new_indent);
o->write_characters(",\n", 2);
}
// last element
assert(i != val.m_value.object->cend());
assert(std::next(i) == val.m_value.object->cend());
o->write_characters(indent_string.c_str(), new_indent);
o->write_character('\"');
dump_escaped(i->first, ensure_ascii);
o->write_characters("\": ", 3);
dump(i->second, true, ensure_ascii, indent_step, new_indent);
o->write_character('\n');
o->write_characters(indent_string.c_str(), current_indent);
o->write_character('}');
}
else
{
o->write_character('{');
// first n-1 elements
auto i = val.m_value.object->cbegin();
for (std::size_t cnt = 0; cnt < val.m_value.object->size() - 1; ++cnt, ++i)
{
o->write_character('\"');
dump_escaped(i->first, ensure_ascii);
o->write_characters("\":", 2);
dump(i->second, false, ensure_ascii, indent_step, current_indent);
o->write_character(',');
}
// last element
assert(i != val.m_value.object->cend());
assert(std::next(i) == val.m_value.object->cend());
o->write_character('\"');
dump_escaped(i->first, ensure_ascii);
o->write_characters("\":", 2);
dump(i->second, false, ensure_ascii, indent_step, current_indent);
o->write_character('}');
}
return;
}
case value_t::array:
{
if (val.m_value.array->empty())
{
o->write_characters("[]", 2);
return;
}
if (pretty_print)
{
o->write_characters("[\n", 2);
// variable to hold indentation for recursive calls
const auto new_indent = current_indent + indent_step;
if (JSON_UNLIKELY(indent_string.size() < new_indent))
{
indent_string.resize(indent_string.size() * 2, ' ');
}
// first n-1 elements
for (auto i = val.m_value.array->cbegin();
i != val.m_value.array->cend() - 1; ++i)
{
o->write_characters(indent_string.c_str(), new_indent);
dump(*i, true, ensure_ascii, indent_step, new_indent);
o->write_characters(",\n", 2);
}
// last element
assert(not val.m_value.array->empty());
o->write_characters(indent_string.c_str(), new_indent);
dump(val.m_value.array->back(), true, ensure_ascii, indent_step, new_indent);
o->write_character('\n');
o->write_characters(indent_string.c_str(), current_indent);
o->write_character(']');
}
else
{
o->write_character('[');
// first n-1 elements
for (auto i = val.m_value.array->cbegin();
i != val.m_value.array->cend() - 1; ++i)
{
dump(*i, false, ensure_ascii, indent_step, current_indent);
o->write_character(',');
}
// last element
assert(not val.m_value.array->empty());
dump(val.m_value.array->back(), false, ensure_ascii, indent_step, current_indent);
o->write_character(']');
}
return;
}
case value_t::string:
{
o->write_character('\"');
dump_escaped(*val.m_value.string, ensure_ascii);
o->write_character('\"');
return;
}
case value_t::boolean:
{
if (val.m_value.boolean)
{
o->write_characters("true", 4);
}
else
{
o->write_characters("false", 5);
}
return;
}
case value_t::number_integer:
{
dump_integer(val.m_value.number_integer);
return;
}
case value_t::number_unsigned:
{
dump_integer(val.m_value.number_unsigned);
return;
}
case value_t::number_float:
{
dump_float(val.m_value.number_float);
return;
}
case value_t::discarded:
{
o->write_characters("<discarded>", 11);
return;
}
case value_t::null:
{
o->write_characters("null", 4);
return;
}
}
}
private:
/*!
@brief returns the number of expected bytes following in UTF-8 string
@param[in] u the first byte of a UTF-8 string
@return the number of expected bytes following
*/
static constexpr std::size_t bytes_following(const uint8_t u)
{
return ((u <= 127) ? 0
: ((192 <= u and u <= 223) ? 1
: ((224 <= u and u <= 239) ? 2
: ((240 <= u and u <= 247) ? 3 : std::string::npos))));
}
/*!
@brief calculates the extra space to escape a JSON string
@param[in] s the string to escape
@param[in] ensure_ascii whether to escape non-ASCII characters with
\uXXXX sequences
@return the number of characters required to escape string @a s
@complexity Linear in the length of string @a s.
*/
static std::size_t extra_space(const string_t& s,
const bool ensure_ascii) noexcept
{
std::size_t res = 0;
for (std::size_t i = 0; i < s.size(); ++i)
{
switch (s[i])
{
// control characters that can be escaped with a backslash
case '"':
case '\\':
case '\b':
case '\f':
case '\n':
case '\r':
case '\t':
{
// from c (1 byte) to \x (2 bytes)
res += 1;
break;
}
// control characters that need \uxxxx escaping
case 0x00:
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
case 0x0B:
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:
{
// from c (1 byte) to \uxxxx (6 bytes)
res += 5;
break;
}
default:
{
if (ensure_ascii and (s[i] & 0x80 or s[i] == 0x7F))
{
const auto bytes = bytes_following(static_cast<uint8_t>(s[i]));
// invalid characters will be detected by throw_if_invalid_utf8
assert (bytes != std::string::npos);
if (bytes == 3)
{
// codepoints that need 4 bytes (i.e., 3 additional
// bytes) in UTF-8 need a surrogate pair when \u
// escaping is used: from 4 bytes to \uxxxx\uxxxx
// (12 bytes)
res += (12 - bytes - 1);
}
else
{
// from x bytes to \uxxxx (6 bytes)
res += (6 - bytes - 1);
}
// skip the additional bytes
i += bytes;
}
break;
}
}
}
return res;
}
static void escape_codepoint(int codepoint, string_t& result, std::size_t& pos)
{
// expecting a proper codepoint
assert(0x00 <= codepoint and codepoint <= 0x10FFFF);
// the last written character was the backslash before the 'u'
assert(result[pos] == '\\');
// write the 'u'
result[++pos] = 'u';
// convert a number 0..15 to its hex representation (0..f)
static const std::array<char, 16> hexify =
{
{
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
}
};
if (codepoint < 0x10000)
{
// codepoints U+0000..U+FFFF can be represented as \uxxxx.
result[++pos] = hexify[(codepoint >> 12) & 0x0F];
result[++pos] = hexify[(codepoint >> 8) & 0x0F];
result[++pos] = hexify[(codepoint >> 4) & 0x0F];
result[++pos] = hexify[codepoint & 0x0F];
}
else
{
// codepoints U+10000..U+10FFFF need a surrogate pair to be
// represented as \uxxxx\uxxxx.
// http://www.unicode.org/faq/utf_bom.html#utf16-4
codepoint -= 0x10000;
const int high_surrogate = 0xD800 | ((codepoint >> 10) & 0x3FF);
const int low_surrogate = 0xDC00 | (codepoint & 0x3FF);
result[++pos] = hexify[(high_surrogate >> 12) & 0x0F];
result[++pos] = hexify[(high_surrogate >> 8) & 0x0F];
result[++pos] = hexify[(high_surrogate >> 4) & 0x0F];
result[++pos] = hexify[high_surrogate & 0x0F];
++pos; // backslash is already in output
result[++pos] = 'u';
result[++pos] = hexify[(low_surrogate >> 12) & 0x0F];
result[++pos] = hexify[(low_surrogate >> 8) & 0x0F];
result[++pos] = hexify[(low_surrogate >> 4) & 0x0F];
result[++pos] = hexify[low_surrogate & 0x0F];
}
++pos;
}
/*!
@brief dump escaped string
Escape a string by replacing certain special characters by a sequence of an
escape character (backslash) and another character and other control
characters by a sequence of "\u" followed by a four-digit hex
representation. The escaped string is written to output stream @a o.
@param[in] s the string to escape
@param[in] ensure_ascii whether to escape non-ASCII characters with
\uXXXX sequences
@complexity Linear in the length of string @a s.
*/
void dump_escaped(const string_t& s, const bool ensure_ascii) const
{
throw_if_invalid_utf8(s);
const auto space = extra_space(s, ensure_ascii);
if (space == 0)
{
o->write_characters(s.c_str(), s.size());
return;
}
// create a result string of necessary size
string_t result(s.size() + space, '\\');
std::size_t pos = 0;
for (std::size_t i = 0; i < s.size(); ++i)
{
switch (s[i])
{
case '"': // quotation mark (0x22)
{
result[pos + 1] = '"';
pos += 2;
break;
}
case '\\': // reverse solidus (0x5C)
{
// nothing to change
pos += 2;
break;
}
case '\b': // backspace (0x08)
{
result[pos + 1] = 'b';
pos += 2;
break;
}
case '\f': // formfeed (0x0C)
{
result[pos + 1] = 'f';
pos += 2;
break;
}
case '\n': // newline (0x0A)
{
result[pos + 1] = 'n';
pos += 2;
break;
}
case '\r': // carriage return (0x0D)
{
result[pos + 1] = 'r';
pos += 2;
break;
}
case '\t': // horizontal tab (0x09)
{
result[pos + 1] = 't';
pos += 2;
break;
}
default:
{
// escape control characters (0x00..0x1F) or, if
// ensure_ascii parameter is used, non-ASCII characters
if ((0x00 <= s[i] and s[i] <= 0x1F) or
(ensure_ascii and (s[i] & 0x80 or s[i] == 0x7F)))
{
const auto bytes = bytes_following(static_cast<uint8_t>(s[i]));
// invalid characters will be detected by throw_if_invalid_utf8
assert (bytes != std::string::npos);
// check that the additional bytes are present
assert(i + bytes < s.size());
// to use \uxxxx escaping, we first need to calculate
// the codepoint from the UTF-8 bytes
int codepoint = 0;
// bytes is unsigned type:
assert(bytes <= 3);
switch (bytes)
{
case 0:
{
codepoint = s[i] & 0xFF;
break;
}
case 1:
{
codepoint = ((s[i] & 0x3F) << 6)
+ (s[i + 1] & 0x7F);
break;
}
case 2:
{
codepoint = ((s[i] & 0x1F) << 12)
+ ((s[i + 1] & 0x7F) << 6)
+ (s[i + 2] & 0x7F);
break;
}
case 3:
{
codepoint = ((s[i] & 0xF) << 18)
+ ((s[i + 1] & 0x7F) << 12)
+ ((s[i + 2] & 0x7F) << 6)
+ (s[i + 3] & 0x7F);
break;
}
default:
break; // LCOV_EXCL_LINE
}
escape_codepoint(codepoint, result, pos);
i += bytes;
}
else
{
// all other characters are added as-is
result[pos++] = s[i];
}
break;
}
}
}
assert(pos == result.size());
o->write_characters(result.c_str(), result.size());
}
/*!
@brief dump an integer
Dump a given integer to output stream @a o. Works internally with
@a number_buffer.
@param[in] x integer number (signed or unsigned) to dump
@tparam NumberType either @a number_integer_t or @a number_unsigned_t
*/
template<typename NumberType, detail::enable_if_t<
std::is_same<NumberType, number_unsigned_t>::value or
std::is_same<NumberType, number_integer_t>::value,
int> = 0>
void dump_integer(NumberType x)
{
// special case for "0"
if (x == 0)
{
o->write_character('0');
return;
}
const bool is_negative = (x <= 0) and (x != 0); // see issue #755
std::size_t i = 0;
while (x != 0)
{
// spare 1 byte for '\0'
assert(i < number_buffer.size() - 1);
const auto digit = std::labs(static_cast<long>(x % 10));
number_buffer[i++] = static_cast<char>('0' + digit);
x /= 10;
}
if (is_negative)
{
// make sure there is capacity for the '-'
assert(i < number_buffer.size() - 2);
number_buffer[i++] = '-';
}
std::reverse(number_buffer.begin(), number_buffer.begin() + i);
o->write_characters(number_buffer.data(), i);
}
/*!
@brief dump a floating-point number
Dump a given floating-point number to output stream @a o. Works internally
with @a number_buffer.
@param[in] x floating-point number to dump
*/
void dump_float(number_float_t x)
{
// NaN / inf
if (not std::isfinite(x) or std::isnan(x))
{
o->write_characters("null", 4);
return;
}
// get number of digits for a text -> float -> text round-trip
static constexpr auto d = std::numeric_limits<number_float_t>::digits10;
// the actual conversion
std::ptrdiff_t len = snprintf(number_buffer.data(), number_buffer.size(), "%.*g", d, x);
// negative value indicates an error
assert(len > 0);
// check if buffer was large enough
assert(static_cast<std::size_t>(len) < number_buffer.size());
// erase thousands separator
if (thousands_sep != '\0')
{
const auto end = std::remove(number_buffer.begin(),
number_buffer.begin() + len, thousands_sep);
std::fill(end, number_buffer.end(), '\0');
assert((end - number_buffer.begin()) <= len);
len = (end - number_buffer.begin());
}
// convert decimal point to '.'
if (decimal_point != '\0' and decimal_point != '.')
{
const auto dec_pos = std::find(number_buffer.begin(), number_buffer.end(), decimal_point);
if (dec_pos != number_buffer.end())
{
*dec_pos = '.';
}
}
o->write_characters(number_buffer.data(), static_cast<std::size_t>(len));
// determine if need to append ".0"
const bool value_is_int_like =
std::none_of(number_buffer.begin(), number_buffer.begin() + len + 1,
[](char c)
{
return (c == '.' or c == 'e');
});
if (value_is_int_like)
{
o->write_characters(".0", 2);
}
}
/*!
@brief check whether a string is UTF-8 encoded
The function checks each byte of a string whether it is UTF-8 encoded. The
result of the check is stored in the @a state parameter. The function must
be called initially with state 0 (accept). State 1 means the string must
be rejected, because the current byte is not allowed. If the string is
completely processed, but the state is non-zero, the string ended
prematurely; that is, the last byte indicated more bytes should have
followed.
@param[in,out] state the state of the decoding
@param[in] byte next byte to decode
@note The function has been edited: a std::array is used and the code
point is not calculated.
@copyright Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
@sa http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
*/
static void decode(uint8_t& state, const uint8_t byte)
{
static const std::array<uint8_t, 400> utf8d =
{
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 00..1F
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20..3F
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 40..5F
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 60..7F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, // 80..9F
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // A0..BF
8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // C0..DF
0xA, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x4, 0x3, 0x3, // E0..EF
0xB, 0x6, 0x6, 0x6, 0x5, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, // F0..FF
0x0, 0x1, 0x2, 0x3, 0x5, 0x8, 0x7, 0x1, 0x1, 0x1, 0x4, 0x6, 0x1, 0x1, 0x1, 0x1, // s0..s0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, // s1..s2
1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, // s3..s4
1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, // s5..s6
1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 // s7..s8
}
};
const uint8_t type = utf8d[byte];
state = utf8d[256u + state * 16u + type];
}
/*!
@brief throw an exception if a string is not UTF-8 encoded
@param[in] str UTF-8 string to check
@throw type_error.316 if passed string is not UTF-8 encoded
@since version 3.0.0
*/
static void throw_if_invalid_utf8(const std::string& str)
{
// start with state 0 (= accept)
uint8_t state = 0;
for (size_t i = 0; i < str.size(); ++i)
{
const auto byte = static_cast<uint8_t>(str[i]);
decode(state, byte);
if (state == 1)
{
// state 1 means reject
std::stringstream ss;
ss << std::setw(2) << std::uppercase << std::setfill('0') << std::hex << static_cast<int>(byte);
JSON_THROW(type_error::create(316, "invalid UTF-8 byte at index " + std::to_string(i) + ": 0x" + ss.str()));
}
}
if (state != 0)
{
// we finish reading, but do not accept: string was incomplete
std::stringstream ss;
ss << std::setw(2) << std::uppercase << std::setfill('0') << std::hex << static_cast<int>(static_cast<uint8_t>(str.back()));
JSON_THROW(type_error::create(316, "incomplete UTF-8 string; last byte: 0x" + ss.str()));
}
}
private:
/// the output of the serializer
output_adapter_t<char> o = nullptr;
/// a (hopefully) large enough character buffer
std::array<char, 64> number_buffer{{}};
/// the locale
const std::lconv* loc = nullptr;
/// the locale's thousand separator character
const char thousands_sep = '\0';
/// the locale's decimal point character
const char decimal_point = '\0';
/// the indentation character
const char indent_char;
/// the indentation string
string_t indent_string;
};
}
}

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#pragma once
#include <array> // array
#include <ciso646> // and
#include <cstddef> // size_t
#include <cstdint> // uint8_t
namespace nlohmann
{
namespace detail
{
///////////////////////////
// JSON type enumeration //
///////////////////////////
/*!
@brief the JSON type enumeration
This enumeration collects the different JSON types. It is internally used to
distinguish the stored values, and the functions @ref basic_json::is_null(),
@ref basic_json::is_object(), @ref basic_json::is_array(),
@ref basic_json::is_string(), @ref basic_json::is_boolean(),
@ref basic_json::is_number() (with @ref basic_json::is_number_integer(),
@ref basic_json::is_number_unsigned(), and @ref basic_json::is_number_float()),
@ref basic_json::is_discarded(), @ref basic_json::is_primitive(), and
@ref basic_json::is_structured() rely on it.
@note There are three enumeration entries (number_integer, number_unsigned, and
number_float), because the library distinguishes these three types for numbers:
@ref basic_json::number_unsigned_t is used for unsigned integers,
@ref basic_json::number_integer_t is used for signed integers, and
@ref basic_json::number_float_t is used for floating-point numbers or to
approximate integers which do not fit in the limits of their respective type.
@sa @ref basic_json::basic_json(const value_t value_type) -- create a JSON
value with the default value for a given type
@since version 1.0.0
*/
enum class value_t : std::uint8_t
{
null, ///< null value
object, ///< object (unordered set of name/value pairs)
array, ///< array (ordered collection of values)
string, ///< string value
boolean, ///< boolean value
number_integer, ///< number value (signed integer)
number_unsigned, ///< number value (unsigned integer)
number_float, ///< number value (floating-point)
discarded ///< discarded by the the parser callback function
};
/*!
@brief comparison operator for JSON types
Returns an ordering that is similar to Python:
- order: null < boolean < number < object < array < string
- furthermore, each type is not smaller than itself
- discarded values are not comparable
@since version 1.0.0
*/
inline bool operator<(const value_t lhs, const value_t rhs) noexcept
{
static constexpr std::array<std::uint8_t, 8> order = {{
0 /* null */, 3 /* object */, 4 /* array */, 5 /* string */,
1 /* boolean */, 2 /* integer */, 2 /* unsigned */, 2 /* float */
}
};
const auto l_index = static_cast<std::size_t>(lhs);
const auto r_index = static_cast<std::size_t>(rhs);
return l_index < order.size() and r_index < order.size() and order[l_index] < order[r_index];
}
}
}

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#ifndef NLOHMANN_JSON_FWD_HPP
#define NLOHMANN_JSON_FWD_HPP
#include <cstdint> // int64_t, uint64_t
#include <map> // map
#include <memory> // allocator
#include <string> // string
#include <vector> // vector
/*!
@brief namespace for Niels Lohmann
@see https://github.com/nlohmann
@since version 1.0.0
*/
namespace nlohmann
{
/*!
@brief default JSONSerializer template argument
This serializer ignores the template arguments and uses ADL
([argument-dependent lookup](http://en.cppreference.com/w/cpp/language/adl))
for serialization.
*/
template<typename = void, typename = void>
struct adl_serializer;
template<template<typename U, typename V, typename... Args> class ObjectType =
std::map,
template<typename U, typename... Args> class ArrayType = std::vector,
class StringType = std::string, class BooleanType = bool,
class NumberIntegerType = std::int64_t,
class NumberUnsignedType = std::uint64_t,
class NumberFloatType = double,
template<typename U> class AllocatorType = std::allocator,
template<typename T, typename SFINAE = void> class JSONSerializer =
adl_serializer>
class basic_json;
/*!
@brief JSON Pointer
A JSON pointer defines a string syntax for identifying a specific value
within a JSON document. It can be used with functions `at` and
`operator[]`. Furthermore, JSON pointers are the base for JSON patches.
@sa [RFC 6901](https://tools.ietf.org/html/rfc6901)
@since version 2.0.0
*/
class json_pointer;
/*!
@brief default JSON class
This type is the default specialization of the @ref basic_json class which
uses the standard template types.
@since version 1.0.0
*/
using json = basic_json<>;
}
#endif

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@ -78,7 +78,7 @@ test-%: src/unit-%.o src/unit.o ../src/json.hpp thirdparty/catch/catch.hpp
TEST_PATTERN ?= "*"
TEST_PREFIX = ""
check: $(TESTCASES)
check: $(OBJECTS) $(TESTCASES)
@cd .. ; for testcase in $(TESTCASES); do echo "Executing $$testcase..."; $(TEST_PREFIX)test/$$testcase $(TEST_PATTERN) || exit 1; done