161 lines
8.7 KiB
Markdown
161 lines
8.7 KiB
Markdown
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
## A fast JSON parser/generator for C++ with both SAX/DOM style API
|
||
|
|
|
||
|
|
Tencent is pleased to support the open source community by making RapidJSON available.
|
||
|
|
|
||
|
|
Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
|
||
|
|
|
||
|
|
* [RapidJSON GitHub](https://github.com/miloyip/rapidjson/)
|
||
|
|
* RapidJSON Documentation
|
||
|
|
* [English](http://rapidjson.org/)
|
||
|
|
* [简体中文](http://rapidjson.org/zh-cn/)
|
||
|
|
* [GitBook](https://www.gitbook.com/book/miloyip/rapidjson/) with downloadable PDF/EPUB/MOBI, without API reference.
|
||
|
|
|
||
|
|
## Build status
|
||
|
|
|
||
|
|
| [Linux][lin-link] | [Windows][win-link] | [Coveralls][cov-link] |
|
||
|
|
| :---------------: | :-----------------: | :-------------------: |
|
||
|
|
| ![lin-badge] | ![win-badge] | ![cov-badge] |
|
||
|
|
|
||
|
|
[lin-badge]: https://travis-ci.org/miloyip/rapidjson.png?branch=master "Travis build status"
|
||
|
|
[lin-link]: https://travis-ci.org/miloyip/rapidjson "Travis build status"
|
||
|
|
[win-badge]: https://ci.appveyor.com/api/projects/status/u658dcuwxo14a8m9/branch/master "AppVeyor build status"
|
||
|
|
[win-link]: https://ci.appveyor.com/project/miloyip/rapidjson/branch/master "AppVeyor build status"
|
||
|
|
[cov-badge]: https://coveralls.io/repos/miloyip/rapidjson/badge.png?branch=master
|
||
|
|
[cov-link]: https://coveralls.io/r/miloyip/rapidjson?branch=master
|
||
|
|
|
||
|
|
## Introduction
|
||
|
|
|
||
|
|
RapidJSON is a JSON parser and generator for C++. It was inspired by [RapidXml](http://rapidxml.sourceforge.net/).
|
||
|
|
|
||
|
|
* RapidJSON is **small** but **complete**. It supports both SAX and DOM style API. The SAX parser is only a half thousand lines of code.
|
||
|
|
|
||
|
|
* RapidJSON is **fast**. Its performance can be comparable to `strlen()`. It also optionally supports SSE2/SSE4.2 for acceleration.
|
||
|
|
|
||
|
|
* RapidJSON is **self-contained** and **header-only**. It does not depend on external libraries such as BOOST. It even does not depend on STL.
|
||
|
|
|
||
|
|
* RapidJSON is **memory-friendly**. Each JSON value occupies exactly 16 bytes for most 32/64-bit machines (excluding text string). By default it uses a fast memory allocator, and the parser allocates memory compactly during parsing.
|
||
|
|
|
||
|
|
* RapidJSON is **Unicode-friendly**. It supports UTF-8, UTF-16, UTF-32 (LE & BE), and their detection, validation and transcoding internally. For example, you can read a UTF-8 file and let RapidJSON transcode the JSON strings into UTF-16 in the DOM. It also supports surrogates and "\u0000" (null character).
|
||
|
|
|
||
|
|
More features can be read [here](doc/features.md).
|
||
|
|
|
||
|
|
JSON(JavaScript Object Notation) is a light-weight data exchange format. RapidJSON should be in fully compliance with RFC7159/ECMA-404, with optional support of relaxed syntax. More information about JSON can be obtained at
|
||
|
|
* [Introducing JSON](http://json.org/)
|
||
|
|
* [RFC7159: The JavaScript Object Notation (JSON) Data Interchange Format](http://www.ietf.org/rfc/rfc7159.txt)
|
||
|
|
* [Standard ECMA-404: The JSON Data Interchange Format](http://www.ecma-international.org/publications/standards/Ecma-404.htm)
|
||
|
|
|
||
|
|
## Highlights in v1.1 (2016-8-25)
|
||
|
|
|
||
|
|
* Added [JSON Pointer](doc/pointer.md)
|
||
|
|
* Added [JSON Schema](doc/schema.md)
|
||
|
|
* Added [relaxed JSON syntax](doc/dom.md) (comment, trailing comma, NaN/Infinity)
|
||
|
|
* Iterating array/object with [C++11 Range-based for loop](doc/tutorial.md)
|
||
|
|
* Reduce memory overhead of each `Value` from 24 bytes to 16 bytes in x86-64 architecture.
|
||
|
|
|
||
|
|
For other changes please refer to [change log](CHANGELOG.md).
|
||
|
|
|
||
|
|
## Compatibility
|
||
|
|
|
||
|
|
RapidJSON is cross-platform. Some platform/compiler combinations which have been tested are shown as follows.
|
||
|
|
* Visual C++ 2008/2010/2013 on Windows (32/64-bit)
|
||
|
|
* GNU C++ 3.8.x on Cygwin
|
||
|
|
* Clang 3.4 on Mac OS X (32/64-bit) and iOS
|
||
|
|
* Clang 3.4 on Android NDK
|
||
|
|
|
||
|
|
Users can build and run the unit tests on their platform/compiler.
|
||
|
|
|
||
|
|
## Installation
|
||
|
|
|
||
|
|
RapidJSON is a header-only C++ library. Just copy the `include/rapidjson` folder to system or project's include path.
|
||
|
|
|
||
|
|
RapidJSON uses following software as its dependencies:
|
||
|
|
* [CMake](https://cmake.org/) as a general build tool
|
||
|
|
* (optional)[Doxygen](http://www.doxygen.org) to build documentation
|
||
|
|
* (optional)[googletest](https://github.com/google/googletest) for unit and performance testing
|
||
|
|
|
||
|
|
To generate user documentation and run tests please proceed with the steps below:
|
||
|
|
|
||
|
|
1. Execute `git submodule update --init` to get the files of thirdparty submodules (google test).
|
||
|
|
2. Create directory called `build` in rapidjson source directory.
|
||
|
|
3. Change to `build` directory and run `cmake ..` command to configure your build. Windows users can do the same with cmake-gui application.
|
||
|
|
4. On Windows, build the solution found in the build directory. On Linux, run `make` from the build directory.
|
||
|
|
|
||
|
|
On successfull build you will find compiled test and example binaries in `bin`
|
||
|
|
directory. The generated documentation will be available in `doc/html`
|
||
|
|
directory of the build tree. To run tests after finished build please run `make
|
||
|
|
test` or `ctest` from your build tree. You can get detailed output using `ctest
|
||
|
|
-V` command.
|
||
|
|
|
||
|
|
It is possible to install library system-wide by running `make install` command
|
||
|
|
from the build tree with administrative privileges. This will install all files
|
||
|
|
according to system preferences. Once RapidJSON is installed, it is possible
|
||
|
|
to use it from other CMake projects by adding `find_package(RapidJSON)` line to
|
||
|
|
your CMakeLists.txt.
|
||
|
|
|
||
|
|
## Usage at a glance
|
||
|
|
|
||
|
|
This simple example parses a JSON string into a document (DOM), make a simple modification of the DOM, and finally stringify the DOM to a JSON string.
|
||
|
|
|
||
|
|
~~~~~~~~~~cpp
|
||
|
|
// rapidjson/example/simpledom/simpledom.cpp`
|
||
|
|
#include "rapidjson/document.h"
|
||
|
|
#include "rapidjson/writer.h"
|
||
|
|
#include "rapidjson/stringbuffer.h"
|
||
|
|
#include <iostream>
|
||
|
|
|
||
|
|
using namespace rapidjson;
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
// 1. Parse a JSON string into DOM.
|
||
|
|
const char* json = "{\"project\":\"rapidjson\",\"stars\":10}";
|
||
|
|
Document d;
|
||
|
|
d.Parse(json);
|
||
|
|
|
||
|
|
// 2. Modify it by DOM.
|
||
|
|
Value& s = d["stars"];
|
||
|
|
s.SetInt(s.GetInt() + 1);
|
||
|
|
|
||
|
|
// 3. Stringify the DOM
|
||
|
|
StringBuffer buffer;
|
||
|
|
Writer<StringBuffer> writer(buffer);
|
||
|
|
d.Accept(writer);
|
||
|
|
|
||
|
|
// Output {"project":"rapidjson","stars":11}
|
||
|
|
std::cout << buffer.GetString() << std::endl;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
~~~~~~~~~~
|
||
|
|
|
||
|
|
Note that this example did not handle potential errors.
|
||
|
|
|
||
|
|
The following diagram shows the process.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
More [examples](https://github.com/miloyip/rapidjson/tree/master/example) are available:
|
||
|
|
|
||
|
|
* DOM API
|
||
|
|
* [tutorial](https://github.com/miloyip/rapidjson/blob/master/example/tutorial/tutorial.cpp): Basic usage of DOM API.
|
||
|
|
|
||
|
|
* SAX API
|
||
|
|
* [simplereader](https://github.com/miloyip/rapidjson/blob/master/example/simplereader/simplereader.cpp): Dumps all SAX events while parsing a JSON by `Reader`.
|
||
|
|
* [condense](https://github.com/miloyip/rapidjson/blob/master/example/condense/condense.cpp): A command line tool to rewrite a JSON, with all whitespaces removed.
|
||
|
|
* [pretty](https://github.com/miloyip/rapidjson/blob/master/example/pretty/pretty.cpp): A command line tool to rewrite a JSON with indents and newlines by `PrettyWriter`.
|
||
|
|
* [capitalize](https://github.com/miloyip/rapidjson/blob/master/example/capitalize/capitalize.cpp): A command line tool to capitalize strings in JSON.
|
||
|
|
* [messagereader](https://github.com/miloyip/rapidjson/blob/master/example/messagereader/messagereader.cpp): Parse a JSON message with SAX API.
|
||
|
|
* [serialize](https://github.com/miloyip/rapidjson/blob/master/example/serialize/serialize.cpp): Serialize a C++ object into JSON with SAX API.
|
||
|
|
* [jsonx](https://github.com/miloyip/rapidjson/blob/master/example/jsonx/jsonx.cpp): Implements a `JsonxWriter` which stringify SAX events into [JSONx](https://www-01.ibm.com/support/knowledgecenter/SS9H2Y_7.1.0/com.ibm.dp.doc/json_jsonx.html) (a kind of XML) format. The example is a command line tool which converts input JSON into JSONx format.
|
||
|
|
|
||
|
|
* Schema
|
||
|
|
* [schemavalidator](https://github.com/miloyip/rapidjson/blob/master/example/schemavalidator/schemavalidator.cpp) : A command line tool to validate a JSON with a JSON schema.
|
||
|
|
|
||
|
|
* Advanced
|
||
|
|
* [prettyauto](https://github.com/miloyip/rapidjson/blob/master/example/prettyauto/prettyauto.cpp): A modified version of [pretty](https://github.com/miloyip/rapidjson/blob/master/example/pretty/pretty.cpp) to automatically handle JSON with any UTF encodings.
|
||
|
|
* [parsebyparts](https://github.com/miloyip/rapidjson/blob/master/example/parsebyparts/parsebyparts.cpp): Implements an `AsyncDocumentParser` which can parse JSON in parts, using C++11 thread.
|
||
|
|
* [filterkey](https://github.com/miloyip/rapidjson/blob/master/example/filterkey/filterkey.cpp): A command line tool to remove all values with user-specified key.
|
||
|
|
* [filterkeydom](https://github.com/miloyip/rapidjson/blob/master/example/filterkeydom/filterkeydom.cpp): Same tool as above, but it demonstrates how to use a generator to populate a `Document`.
|