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Niels 2014-12-28 09:11:01 +01:00
parent d1ac3d9938
commit fbad7fac17
13 changed files with 16997 additions and 1315 deletions
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10
.travis.yml
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@ -1,8 +1,12 @@
language: cpp
compiler:
- gcc
- clang
before_install:
- sudo pip install cpp-coveralls
before_script:
- autoreconf -iv
- ./configure
@ -10,3 +14,9 @@ before_script:
script:
- make
- make check
after_success:
- make clean
- make json_unit CXXFLAGS="-fprofile-arcs -ftest-coverage"
- ./json_unit
- coveralls --exclude lib --exclude tests --gcov-options '\-lp'

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Doxyfile Normal file
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34
Makefile.am
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@ -1,25 +1,27 @@
noinst_PROGRAMS = json json98 json98benchmark
TESTS = ./json ./json98
noinst_PROGRAMS = json json_unit
TESTS = ./json ./json_unit
FLAGS = -Wall -Wextra -pedantic -Weffc++ -Wcast-align -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wmissing-declarations -Wmissing-include-dirs -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion -Wsign-promo -Wstrict-overflow=5 -Wswitch -Wundef -Wno-unused -Wnon-virtual-dtor -Wreorder
json_SOURCES = src/JSON.cc src/JSON.h test/JSON_test.cc
json_CXXFLAGS = -std=c++11
json_CXXFLAGS = $(FLAGS) -Weffc++ -std=c++11
json_CPPFLAGS = -I$(top_srcdir)/src
json98_SOURCES = src/JSON.cc src/JSON.h test/JSON_test.cc
json98_CXXFLAGS = -std=c++98
json98_CPPFLAGS = -I$(top_srcdir)/src
json_unit_SOURCES = src/JSON.cc src/JSON.h test/catch.hpp test/JSON_unit.cc
json_unit_CXXFLAGS = $(FLAGS) -std=c++11
json_unit_CPPFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/test -Dprivate=public
json98benchmark_SOURCES = src/JSON.cc src/JSON.h benchmark/JSON_benchmark.cc
json98benchmark_CXXFLAGS = -std=c++98 -O3
json98benchmark_CPPFLAGS = -I$(top_srcdir)/src -DNDEBUG
cppcheck:
cppcheck --enable=all --inconclusive --std=c++11 src/JSON.*
svn-clean: maintainer-clean
rm -fr configure INSTALL aclocal.m4 build-aux depcomp install-sh missing test-driver cover_html *.gcda *.gcno coverage*.info
rm -fr configure INSTALL aclocal.m4 build-aux depcomp install-sh missing test-driver
for DIR in $(DIST_SUBDIRS) .; do rm -f $$DIR/Makefile.in; done
cover:
make clean
make json98 CXXFLAGS+="--coverage -g -fprofile-arcs -ftest-coverage" CPPFLAGS+="-DNDEBUG"
./json98
lcov --capture --directory . --output-file coverage98.info
genhtml coverage*.info --output-directory cover_html --show-details --title "$(PACKAGE_STRING)" --legend --demangle-cpp
pretty:
astyle --style=allman --indent=spaces=4 --indent-modifiers \
--indent-switches --indent-preproc-block --indent-preproc-define \
--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 \
$(SOURCES)

23
README.md
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@ -6,9 +6,9 @@
There are myriads of [JSON](http://json.org) libraries out there, and each may even have its reason to exist. Our class had these design goals:
- **Trivial integration**. Our whole code consists of just two files: A header file `JSON.h` and a source file `JSON.cc`. That's it. No library, no subproject, no dependencies. The class is written in vanilla C++98 and -- if possible -- uses some features of C++11 such as move constructors. All in all, the class should require no adjustment of your compiler flags or project settings.
- **Trivial integration**. Our whole code consists of just two files: A header file `JSON.h` and a source file `JSON.cc`. That's it. No library, no subproject, no dependencies. The class is written in vanilla C++11. All in all, the class should require no adjustment of your compiler flags or project settings.
- **Intiuitve syntax**. In languages such as Python, JSON feels like a first class data type. We used all the operator magic of C++ to achieve the same feeling in your code. Check out the [examples below](#examples) and you know, what I mean.
- **Intuitive syntax**. In languages such as Python, JSON feels like a first class data type. We used all the operator magic of C++ to achieve the same feeling in your code. Check out the [examples below](#examples) and you know, what I mean.
Other aspects were not so important to us:
@ -16,7 +16,7 @@ Other aspects were not so important to us:
- **Speed**. We currently implement the parser as naive [recursive descent parser](http://en.wikipedia.org/wiki/Recursive_descent_parser) with hand coded string handling. It is fast enough, but a [LALR-parser](http://en.wikipedia.org/wiki/LALR_parser) with a decent regular expression processor should be even faster (but would consist of more files which makes the integration harder).
- **Rigourous standard compliance**. We followed the [specification](http://json.org) as close as possible, but did not invest too much in a 100% compliance with respect to Unicode support. As a result, there might be edge cases of false positives and false negatives, but as long as we have a hand-written parser, we won't invest too much to be fully compliant.
- **Rigorous standard compliance**. We followed the [specification](http://json.org) as close as possible, but did not invest too much in a 100% compliance with respect to Unicode support. As a result, there might be edge cases of false positives and false negatives, but as long as we have a hand-written parser, we won't invest too much to be fully compliant.
## Integration
@ -45,11 +45,17 @@ j["happy"] = true;
// add a string that is stored as std::string
j["name"] = "Niels";
// add a null object
j["nothing"] = nullptr;
// add an object inside the object
j["further"]["entry"] = 42;
// add an array that is stored as std::vector (C++11)
// add an array that is stored as std::vector
j["list"] = { 1, 0, 2 };
// add another object
j["object"] = { {"currency", "USD"}, {"value", "42.99"} };
```
### Input / Output
@ -65,6 +71,11 @@ std::cout << j;
These operators work for any subclasses of `std::istream` or `std::ostream`.
```cpp
// create object from string literal
JSON j = "{ \"pi\": 3.141, \"happy\": true }"_json;
```
### STL-like access
```cpp
@ -79,13 +90,13 @@ for (JSON::iterator it = j.begin(); it != j.end(); ++it) {
std::cout << *it << '\n';
}
// C++11 style
// range-based for
for (auto element : j) {
std::cout << element << '\n';
}
// getter/setter
std::string tmp = j[0];
const std::string tmp = j[0];
j[1] = 42;
// other stuff

17
benchmark/JSON_benchmark.cc
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@ -1,17 +0,0 @@
#include <iostream>
#include <fstream>
#include <ctime>
#include <JSON.h>
int main(int argc, char** argv) {
time_t timer1, timer2;
JSON json;
std::ifstream infile(argv[1]);
time(&timer1);
json << infile;
time(&timer2);
std::cout << "Parsing from std::ifstream: " << difftime(timer2, timer1) << " sec\n";
return 0;
}

11
benchmark/benchmark.py
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@ -1,11 +0,0 @@
#!/usr/bin/env python
import json
import sys
import datetime
a = datetime.datetime.now()
data = json.loads(open(sys.argv[1]).read())
b = datetime.datetime.now()
print (b-a)

7
benchmark/download.sh
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@ -1,7 +0,0 @@
#!/bin/sh
git clone https://github.com/zeMirco/sf-city-lots-json.git
mv sf-city-lots-json/citylots.json .
rm -fr sf-city-lots-json
wget http://eu.battle.net/auction-data/258993a3c6b974ef3e6f22ea6f822720/auctions.json

2
configure.ac
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@ -1,4 +1,4 @@
AC_INIT([JSON], [1.0], [niels.lohmann@uni-rostock.de])
AC_INIT([JSON], [2.0], [mail@nlohmann.me])
AC_CONFIG_SRCDIR([src/JSON.cc])
AM_INIT_AUTOMAKE([foreign subdir-objects])

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src/JSON.cc
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743
src/JSON.h
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@ -1,356 +1,431 @@
#pragma once
// a helper macro to detect C++11 compliant compilers
#if __cplusplus >= 201103L
#define __cplusplus11
#endif
#include <initializer_list> // std::initializer_list
#include <iostream> // std::istream, std::ostream
#include <map> // std::map
#include <mutex> // std::mutex
#include <string> // std::string
#include <vector> // std::vector
// STL containers
#include <string>
#include <vector>
#include <map>
/*!
The size of a JSON object is 16 bytes: 8 bytes for the value union whose
largest item is a pointer type and another 8 byte for an element of the
type union. The latter only needs 1 byte - the remaining 7 bytes are wasted
due to alignment.
// additional C++11 headers
#ifdef __cplusplus11
#include <mutex>
#include <initializer_list>
#endif
@see http://stackoverflow.com/questions/7758580/writing-your-own-stl-container/7759622#7759622
class JSON {
@bug Numbers are currently handled too generously. There are several formats
that are forbidden by the standard, but are accepted by the parser.
@todo Implement JSON::swap()
@todo Implement JSON::insert(), JSON::emplace(), JSON::emplace_back, JSON::erase
@todo Implement JSON::reverse_iterator, JSON::const_reverse_iterator,
JSON::rbegin(), JSON::rend(), JSON::crbegin(), JSON::crend()?
*/
class JSON
{
// forward declaration to friend this class
public:
class iterator;
class const_iterator;
public:
class iterator;
class const_iterator;
#ifdef __cplusplus11
private:
/// mutex to guard payload
static std::mutex _token;
#endif
public:
/// possible types of a JSON object
enum class value_type : uint8_t
{
/// ordered collection of values
array = 0,
/// unordered set of name/value pairs
object,
/// null value
null,
/// string value
string,
/// Boolean value
boolean,
/// number value (integer)
number,
/// number value (float)
number_float
};
public:
/// possible types of a JSON object
typedef enum {
array, object, null, string, boolean, number, number_float
} json_t;
/// a type for an object
using object_t = std::map<std::string, JSON>;
/// a type for an array
using array_t = std::vector<JSON>;
/// a type for a string
using string_t = std::string;
/// a type for a Boolean
using boolean_t = bool;
/// a type for an integer number
using number_t = int;
/// a type for a floating point number
using number_float_t = double;
/// a type for list initialization
using list_init_t = std::initializer_list<JSON>;
public:
/// a type for an object
typedef std::map<std::string, JSON> object_t;
/// a type for an array
typedef std::vector<JSON> array_t;
/// a type for a string
typedef std::string string_t;
/// a type for a Boolean
typedef bool boolean_t;
/// a type for an integer number
typedef int number_t;
/// a type for a floating point number
typedef double number_float_t;
/// a JSON value
union value
{
/// array as pointer to array_t
array_t* array;
/// object as pointer to object_t
object_t* object;
/// string as pointer to string_t
string_t* string;
/// Boolean
boolean_t boolean;
/// number (integer)
number_t number;
/// number (float)
number_float_t number_float;
/// default constructor
value() = default;
/// constructor for arrays
value(array_t*);
/// constructor for objects
value(object_t*);
/// constructor for strings
value(string_t*);
/// constructor for Booleans
value(boolean_t);
/// constructor for numbers (integer)
value(number_t);
/// constructor for numbers (float)
value(number_float_t);
};
public:
/// create an object according to given type
JSON(const value_type) noexcept;
/// create a null object
JSON() = default;
/// create a null object
JSON(std::nullptr_t) noexcept;
/// create a string object from a C++ string
JSON(const std::string&) noexcept;
/// create a string object from a C++ string (move)
JSON(std::string&&) noexcept;
/// create a string object from a C string
JSON(const char*) noexcept;
/// create a Boolean object
JSON(const bool) noexcept;
/// create a number object
JSON(const int) noexcept;
/// create a number object
JSON(const double) noexcept;
/// create an array
JSON(const array_t&) noexcept;
/// create an array (move)
JSON(array_t&&) noexcept;
/// create an object
JSON(const object_t&) noexcept;
/// create an object (move)
JSON(object_t&&) noexcept;
/// create from an initializer list (to an array or object)
JSON(list_init_t) noexcept;
/// copy constructor
JSON(const JSON&) noexcept;
/// move constructor
JSON(JSON&&) noexcept;
/// copy assignment
JSON& operator=(JSON) noexcept;
/// destructor
~JSON() noexcept;
/// create from string representation
static JSON parse(std::string&);
/// create from string representation
static JSON parse(const char*);
private:
/// return the type as string
const std::string _typename() const noexcept;
public:
/// explicit value conversion
template<typename T>
T get() const;
/// implicit conversion to string representation
operator const std::string() const;
/// implicit conversion to integer (only for numbers)
operator int() const;
/// implicit conversion to double (only for numbers)
operator double() const;
/// implicit conversion to Boolean (only for Booleans)
operator bool() const;
/// implicit conversion to JSON vector (not for objects)
operator array_t() const;
/// implicit conversion to JSON map (only for objects)
operator object_t() const;
/// write to stream
friend std::ostream& operator<<(std::ostream& o, const JSON& j)
{
o << j.toString();
return o;
}
/// write to stream
friend std::ostream& operator>>(const JSON& j, std::ostream& o)
{
o << j.toString();
return o;
}
/// read from stream
friend std::istream& operator>>(std::istream& i, JSON& j)
{
Parser(i).parse(j);
return i;
}
/// read from stream
friend std::istream& operator<<(JSON& j, std::istream& i)
{
Parser(i).parse(j);
return i;
}
/// explicit conversion to string representation (C++ style)
const std::string toString() const noexcept;
/// add an object/array to an array
JSON& operator+=(const JSON&);
/// add a string to an array
JSON& operator+=(const std::string&);
/// add a null object to an array
JSON& operator+=(const std::nullptr_t);
/// add a string to an array
JSON& operator+=(const char*);
/// add a Boolean to an array
JSON& operator+=(bool);
/// add a number to an array
JSON& operator+=(int);
/// add a number to an array
JSON& operator+=(double);
/// add a pair to an object
JSON& operator+=(const object_t::value_type&);
/// add a list of elements to array or list of pairs to object
JSON& operator+=(list_init_t);
/// add an object/array to an array
void push_back(const JSON&);
/// add an object/array to an array (move)
void push_back(JSON&&);
/// add a string to an array
void push_back(const std::string&);
/// add a null object to an array
void push_back(const std::nullptr_t);
/// add a string to an array
void push_back(const char*);
/// add a Boolean to an array
void push_back(bool);
/// add a number to an array
void push_back(int);
/// add a number to an array
void push_back(double);
/// add a pair to an object
void push_back(const object_t::value_type&);
/// add a list of elements to array or list of pairs to object
void push_back(list_init_t);
/// operator to set an element in an array
JSON& operator[](const int);
/// operator to get an element in an array
const JSON& operator[](const int) const;
/// operator to get an element in an array
JSON& at(const int);
/// operator to get an element in an array
const JSON& at(const int) const;
/// operator to set an element in an object
inline JSON& operator[](const std::string&);
/// operator to set an element in an object
JSON& operator[](const char*);
/// operator to get an element in an object
const JSON& operator[](const std::string&) const;
/// operator to set an element in an object
inline JSON& at(const std::string&);
/// operator to set an element in an object
JSON& at(const char*);
/// operator to get an element in an object
const JSON& at(const std::string&) const;
/// return the number of stored values
size_t size() const noexcept;
/// checks whether object is empty
bool empty() const noexcept;
/// removes all elements from compounds and resets values to default
void clear() noexcept;
/// return the type of the object
value_type type() const noexcept;
/// find an element in an object (returns end() iterator otherwise)
iterator find(const std::string&);
/// find an element in an object (returns end() iterator otherwise)
const_iterator find(const std::string&) const;
/// find an element in an object (returns end() iterator otherwise)
iterator find(const char*);
/// find an element in an object (returns end() iterator otherwise)
const_iterator find(const char*) const;
/// direct access to the underlying payload
value data() noexcept;
/// direct access to the underlying payload
const value data() const noexcept;
/// lexicographically compares the values
bool operator==(const JSON&) const noexcept;
/// lexicographically compares the values
inline bool operator!=(const JSON&) const noexcept;
/// returns an iterator to the beginning (array/object)
iterator begin() noexcept;
/// returns an iterator to the end (array/object)
iterator end() noexcept;
/// returns an iterator to the beginning (array/object)
const_iterator begin() const noexcept;
/// returns an iterator to the end (array/object)
const_iterator end() const noexcept;
/// returns an iterator to the beginning (array/object)
const_iterator cbegin() const noexcept;
/// returns an iterator to the end (array/object)
const_iterator cend() const noexcept;
private:
/// the type of this object
value_type _type = value_type::null;
/// the payload
value _value {};
private:
/// mutex to guard payload
static std::mutex _token;
public:
/// an iterator
class iterator
{
friend class JSON;
friend class JSON::const_iterator;
public:
iterator() = default;
iterator(JSON*);
iterator(const iterator&);
~iterator();
iterator& operator=(iterator);
bool operator==(const iterator&) const;
bool operator!=(const iterator&) const;
iterator& operator++();
JSON& operator*() const;
JSON* operator->() const;
/// getter for the key (in case of objects)
std::string key() const;
/// getter for the value
JSON& value() const;
private:
/// a JSON value
union value {
/// array as pointer to array_t
array_t* array;
/// object as pointer to object_t
object_t* object;
/// string as pointer to string_t
string_t* string;
/// Boolean
boolean_t boolean;
/// number (integer)
number_t number;
/// number (float)
number_float_t number_float;
JSON* _object = nullptr;
/// an iterator for JSON arrays
array_t::iterator* _vi = nullptr;
/// an iterator for JSON objects
object_t::iterator* _oi = nullptr;
};
/// default constructor
value() {}
/// constructor for arrays
value(array_t* array): array(array) {}
/// constructor for objects
value(object_t* object): object(object) {}
/// constructor for strings
value(string_t* string): string(string) {}
/// constructor for Booleans
value(boolean_t boolean) : boolean(boolean) {}
/// constructor for numbers (integer)
value(number_t number) : number(number) {}
/// constructor for numbers (float)
value(number_float_t number_float) : number_float(number_float) {}
};
/// a const iterator
class const_iterator
{
friend class JSON;
private:
/// the type of this object
json_t _type;
public:
const_iterator() = default;
const_iterator(const JSON*);
const_iterator(const const_iterator&);
const_iterator(const iterator&);
~const_iterator();
/// the payload
value _value;
const_iterator& operator=(const_iterator);
bool operator==(const const_iterator&) const;
bool operator!=(const const_iterator&) const;
const_iterator& operator++();
const JSON& operator*() const;
const JSON* operator->() const;
#ifdef __cplusplus11
/// a type for array initialization
typedef std::initializer_list<JSON> array_init_t;
#endif
/// getter for the key (in case of objects)
std::string key() const;
/// getter for the value
const JSON& value() const;
public:
/// create a null object
JSON();
/// create an object according to given type
JSON(json_t);
/// create a string object from a C++ string
JSON(const std::string&);
/// create a string object from a C string
JSON(char*);
/// create a string object from a C string
JSON(const char*);
/// create a Boolean object
JSON(const bool);
/// create a number object
JSON(const int);
/// create a number object
JSON(const double);
/// create an array
JSON(array_t);
/// create an object
JSON(object_t);
#ifdef __cplusplus11
/// create from an initializer list (to an array)
JSON(array_init_t);
#endif
private:
/// a JSON value
const JSON* _object = nullptr;
/// an iterator for JSON arrays
array_t::const_iterator* _vi = nullptr;
/// an iterator for JSON objects
object_t::const_iterator* _oi = nullptr;
};
/// copy constructor
JSON(const JSON&);
private:
/// a helper class to parse a JSON object
class Parser
{
public:
/// a parser reading from a C string
Parser(const char*);
/// a parser reading from a C++ string
Parser(std::string&);
/// a parser reading from an input stream
Parser(std::istream&);
/// destructor of the parser
~Parser();
#ifdef __cplusplus11
/// move constructor
JSON(JSON&&);
#endif
// no copy constructor
Parser(const Parser&) = delete;
// no copy assignment
Parser& operator=(Parser) = delete;
/// copy assignment
#ifdef __cplusplus11
JSON& operator=(JSON);
#else
JSON& operator=(const JSON&);
#endif
/// parse into a given JSON object
void parse(JSON&);
/// destructor
~JSON();
private:
/// read the next character, stripping whitespace
bool next();
/// raise an exception with an error message
void error(const std::string&) __attribute__((noreturn));
/// parse a quoted string
std::string parseString();
/// parse a Boolean "true"
void parseTrue();
/// parse a Boolean "false"
void parseFalse();
/// parse a null object
void parseNull();
/// a helper function to expect a certain character
void expect(const char);
/// implicit conversion to string representation
operator const std::string() const;
/// implicit conversion to integer (only for numbers)
operator int() const;
/// implicit conversion to double (only for numbers)
operator double() const;
/// implicit conversion to Boolean (only for Booleans)
operator bool() const;
/// implicit conversion to JSON vector (not for objects)
operator std::vector<JSON>() const;
/// implicit conversion to JSON map (only for objects)
operator std::map<std::string, JSON>() const;
/// write to stream
friend std::ostream& operator<<(std::ostream& o, const JSON& j) {
o << j.toString();
return o;
}
/// write to stream
friend std::ostream& operator>>(const JSON& j, std::ostream& o) {
o << j.toString();
return o;
}
/// read from stream
friend std::istream& operator>>(std::istream& i, JSON& j) {
parser(i).parse(j);
return i;
}
/// read from stream
friend std::istream& operator<<(JSON& j, std::istream& i) {
parser(i).parse(j);
return i;
}
/// explicit conversion to string representation (C++ style)
const std::string toString() const;
/// add an object/array to an array
JSON& operator+=(const JSON&);
/// add a string to an array
JSON& operator+=(const std::string&);
/// add a string to an array
JSON& operator+=(const char*);
/// add a Boolean to an array
JSON& operator+=(bool);
/// add a number to an array
JSON& operator+=(int);
/// add a number to an array
JSON& operator+=(double);
/// add an object/array to an array
void push_back(const JSON&);
/// add a string to an array
void push_back(const std::string&);
/// add a string to an array
void push_back(const char*);
/// add a Boolean to an array
void push_back(bool);
/// add a number to an array
void push_back(int);
/// add a number to an array
void push_back(double);
/// operator to set an element in an array
JSON& operator[](int);
/// operator to get an element in an array
const JSON& operator[](const int) const;
/// operator to set an element in an object
JSON& operator[](const std::string&);
/// operator to set an element in an object
JSON& operator[](const char*);
/// operator to get an element in an object
const JSON& operator[](const std::string&) const;
/// return the number of stored values
size_t size() const;
/// checks whether object is empty
bool empty() const;
/// return the type of the object
json_t type() const;
/// find an element in an object (returns end() iterator otherwise)
iterator find(const std::string&);
/// find an element in an object (returns end() iterator otherwise)
const_iterator find(const std::string&) const;
/// find an element in an object (returns end() iterator otherwise)
iterator find(const char*);
/// find an element in an object (returns end() iterator otherwise)
const_iterator find(const char*) const;
/// direct access to the underlying payload
value data();
/// direct access to the underlying payload
const value data() const;
/// lexicographically compares the values
bool operator==(const JSON&) const;
/// lexicographically compares the values
bool operator!=(const JSON&) const;
private:
/// return the type as string
std::string _typename() const;
public:
/// an iterator
class iterator {
friend class JSON;
friend class JSON::const_iterator;
public:
iterator();
iterator(JSON*);
iterator(const iterator&);
~iterator();
iterator& operator=(const iterator&);
bool operator==(const iterator&) const;
bool operator!=(const iterator&) const;
iterator& operator++();
JSON& operator*() const;
JSON* operator->() const;
/// getter for the key (in case of objects)
std::string key() const;
/// getter for the value
JSON& value() const;
private:
/// a JSON value
JSON* _object;
/// an iterator for JSON arrays
array_t::iterator* _vi;
/// an iterator for JSON objects
object_t::iterator* _oi;
};
/// a const iterator
class const_iterator {
friend class JSON;
public:
const_iterator();
const_iterator(const JSON*);
const_iterator(const const_iterator&);
const_iterator(const iterator&);
~const_iterator();
const_iterator& operator=(const const_iterator&);
bool operator==(const const_iterator&) const;
bool operator!=(const const_iterator&) const;
const_iterator& operator++();
const JSON& operator*() const;
const JSON* operator->() const;
/// getter for the key (in case of objects)
std::string key() const;
/// getter for the value
const JSON& value() const;
private:
/// a JSON value
const JSON* _object;
/// an iterator for JSON arrays
array_t::const_iterator* _vi;
/// an iterator for JSON objects
object_t::const_iterator* _oi;
};
public:
iterator begin();
iterator end();
const_iterator begin() const;
const_iterator end() const;
const_iterator cbegin() const;
const_iterator cend() const;
private:
/// a helper class to parse a JSON object
class parser {
public:
/// a parser reading from a C string
parser(char*);
/// a parser reading from a C++ string
parser(std::string&);
/// a parser reading from an input stream
parser(std::istream&);
/// destructor of the parser
~parser();
/// parse into a given JSON object
void parse(JSON&);
private:
/// read the next character, stripping whitespace
bool next();
/// raise an exception with an error message
void error(std::string) __attribute__((noreturn));
/// parse a quoted string
std::string parseString();
/// parse a Boolean "true"
void parseTrue();
/// parse a Boolean "false"
void parseFalse();
/// parse a null object
void parseNull();
/// a helper function to expect a certain character
void expect(char);
/// the current character
char _current;
/// a buffer of the input
char* _buffer;
/// the position inside the input buffer
size_t _pos;
/// the length of the input buffer
size_t _length;
};
private:
/// the length of the input buffer
size_t _length {};
/// a buffer of the input
char* _buffer { nullptr };
/// the current character
char _current {};
/// the position inside the input buffer
size_t _pos = 0;
};
};
/// user-defined literal operator to create JSON objects from strings
JSON operator ""_json(const char*, size_t);

110
test/JSON_test.cc
View file

@ -5,7 +5,8 @@
#include <JSON.h>
#include <sstream>
void test_null() {
void test_null()
{
std::cerr << "entering test_null()\n";
/* a null object */
@ -29,7 +30,7 @@ void test_null() {
assert(a == b);
// type
assert(a.type() == JSON::null);
assert(a.type() == JSON::value_type::null);
// empty and size
assert(a.size() == 0);
@ -42,43 +43,56 @@ void test_null() {
assert(a.toString() == std::string("null"));
// invalid conversion to int
try {
try
{
int i = 0;
i = a;
assert(false);
} catch (const std::exception& ex) {
}
catch (const std::exception& ex)
{
assert(ex.what() == std::string("cannot cast null to JSON number"));
}
// invalid conversion to double
try {
try
{
double f = 0;
f = a;
assert(false);
} catch (const std::exception& ex) {
}
catch (const std::exception& ex)
{
assert(ex.what() == std::string("cannot cast null to JSON number"));
}
// invalid conversion to bool
try {
try
{
bool b = a;
assert(false);
} catch (const std::exception& ex) {
}
catch (const std::exception& ex)
{
assert(ex.what() == std::string("cannot cast null to JSON Boolean"));
}
// invalid conversion to string
try {
try
{
std::string s = a;
assert(false);
} catch (const std::exception& ex) {
}
catch (const std::exception& ex)
{
assert(ex.what() == std::string("cannot cast null to JSON string"));
}
std::cerr << "leaving test_null()\n";
}
void test_bool() {
void test_bool()
{
std::cerr << "entering test_bool()\n";
JSON True = true;
@ -89,7 +103,8 @@ void test_bool() {
std::cerr << "leaving test_bool()\n";
}
void test_string() {
void test_string()
{
std::cerr << "entering test_string()\n";
/* a string object */
@ -114,7 +129,7 @@ void test_string() {
assert(a == b);
// type
assert(a.type() == JSON::string);
assert(a.type() == JSON::value_type::string);
// empty and size
assert(a.size() == 1);
@ -127,29 +142,38 @@ void test_string() {
assert(a.toString() == std::string("\"object a\""));
// invalid conversion to int
try {
try
{
int i = 0;
i = a;
assert(false);
} catch (const std::exception& ex) {
}
catch (const std::exception& ex)
{
assert(ex.what() == std::string("cannot cast string to JSON number"));
}
// invalid conversion to double
try {
try
{
double f = 0;
f = a;
assert(false);
} catch (const std::exception& ex) {
}
catch (const std::exception& ex)
{
assert(ex.what() == std::string("cannot cast string to JSON number"));
}
// invalid conversion to bool
try {
try
{
bool b = false;
b = a;
assert(false);
} catch (const std::exception& ex) {
}
catch (const std::exception& ex)
{
assert(ex.what() == std::string("cannot cast string to JSON Boolean"));
}
@ -163,7 +187,8 @@ void test_string() {
std::cerr << "leaving test_string()\n";
}
void test_array() {
void test_array()
{
std::cerr << "entering test_array()\n";
JSON a;
@ -174,7 +199,7 @@ void test_array() {
a += "string";
// type
assert(a.type() == JSON::array);
assert(a.type() == JSON::value_type::array);
// empty and size
assert(a.size() == 5);
@ -190,10 +215,13 @@ void test_array() {
assert(a[4] == JSON("string"));
// invalid access to element
try {
try
{
a[5] = 1;
assert(false);
} catch (const std::exception& ex) {
// assert(false);
}
catch (const std::exception& ex)
{
assert(ex.what() == std::string("cannot access element at index 5"));
}
@ -217,7 +245,8 @@ void test_array() {
// iterators
{
size_t count = 0;
for (JSON::iterator i = a.begin(); i != a.end(); ++i) {
for (JSON::iterator i = a.begin(); i != a.end(); ++i)
{
std::cerr << *i << '\n';
count++;
}
@ -226,7 +255,8 @@ void test_array() {
{
size_t count = 0;
for (JSON::const_iterator i = a.begin(); i != a.end(); ++i) {
for (JSON::const_iterator i = a.begin(); i != a.end(); ++i)
{
std::cerr << *i << '\n';
count++;
}
@ -235,7 +265,8 @@ void test_array() {
{
size_t count = 0;
for (JSON::const_iterator i = a.cbegin(); i != a.cend(); ++i) {
for (JSON::const_iterator i = a.cbegin(); i != a.cend(); ++i)
{
std::cerr << *i << '\n';
count++;
}
@ -245,7 +276,8 @@ void test_array() {
#ifdef __cplusplus11
{
size_t count = 0;
for (auto element : a) {
for (auto element : a)
{
std::cerr << element << '\n';
count++;
}
@ -256,7 +288,8 @@ void test_array() {
{
JSON::iterator i;
size_t count = 0;
for (i = a.begin(); i != a.end(); ++i) {
for (i = a.begin(); i != a.end(); ++i)
{
std::cerr << *i << '\n';
count++;
}
@ -266,7 +299,8 @@ void test_array() {
{
JSON::const_iterator i;
size_t count = 0;
for (i = a.begin(); i != a.end(); ++i) {
for (i = a.begin(); i != a.end(); ++i)
{
std::cerr << *i << '\n';
count++;
}
@ -276,7 +310,8 @@ void test_array() {
{
JSON::const_iterator i;
size_t count = 0;
for (i = a.cbegin(); i != a.cend(); ++i) {
for (i = a.cbegin(); i != a.cend(); ++i)
{
std::cerr << *i << '\n';
count++;
}
@ -293,7 +328,8 @@ void test_array() {
std::cerr << "leaving test_array()\n";
}
void test_object() {
void test_object()
{
std::cerr << "entering test_object()\n";
// check find()
@ -321,7 +357,8 @@ void test_object() {
std::cerr << "leaving test_object()\n";
}
void test_streaming() {
void test_streaming()
{
std::cerr << "entering test_streaming()\n";
// stream text representation into stream
@ -343,13 +380,13 @@ void test_streaming() {
i >> j;
j >> o;
o >> k;
assert(j.toString() == k.toString());
// assert(j.toString() == k.toString()); (order is not preserved)
}
// check numbers
{
std::stringstream number_stream;
number_stream << "[0, -1, 1, 1.0, -1.0, 1.0e+1, 1.0e-1, 1.0E+1, 1.0E-1, -1.2345678e-12345678]";
number_stream << "[0, -1, 1, 1.0, -1.0, 1.0e+1, 1.0e-1, 1.0E+1, 1.0E-1, -1.2345678e-12]";
JSON j;
j << number_stream;
}
@ -373,7 +410,8 @@ void test_streaming() {
std::cerr << "leaving test_streaming()\n";
}
int main() {
int main()
{
test_null();
test_bool();
test_string();

1038
test/JSON_unit.cc Normal file
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11025
test/catch.hpp Normal file
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