161 lines
8.8 KiB
Markdown
161 lines
8.8 KiB
Markdown
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## A fast JSON parser/generator for C++ with both SAX/DOM style API
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Tencent is pleased to support the open source community by making RapidJSON available.
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Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
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* [RapidJSON GitHub](https://github.com/Tencent/rapidjson/)
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* RapidJSON Documentation
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* [English](http://rapidjson.org/)
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* [简体中文](http://rapidjson.org/zh-cn/)
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* [GitBook](https://www.gitbook.com/book/miloyip/rapidjson/) with downloadable PDF/EPUB/MOBI, without API reference.
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## Build status
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| [Linux][lin-link] | [Windows][win-link] | [Coveralls][cov-link] |
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| :---------------: | :-----------------: | :-------------------: |
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| ![lin-badge] | ![win-badge] | ![cov-badge] |
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[lin-badge]: https://travis-ci.org/Tencent/rapidjson.svg?branch=master "Travis build status"
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[lin-link]: https://travis-ci.org/Tencent/rapidjson "Travis build status"
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[win-badge]: https://ci.appveyor.com/api/projects/status/l6qulgqahcayidrf/branch/master?svg=true "AppVeyor build status"
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[win-link]: https://ci.appveyor.com/project/miloyip/rapidjson-0fdqj/branch/master "AppVeyor build status"
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[cov-badge]: https://coveralls.io/repos/Tencent/rapidjson/badge.svg?branch=master "Coveralls coverage"
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[cov-link]: https://coveralls.io/r/Tencent/rapidjson?branch=master "Coveralls coverage"
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## Introduction
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RapidJSON is a JSON parser and generator for C++. It was inspired by [RapidXml](http://rapidxml.sourceforge.net/).
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* RapidJSON is **small** but **complete**. It supports both SAX and DOM style API. The SAX parser is only a half thousand lines of code.
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* RapidJSON is **fast**. Its performance can be comparable to `strlen()`. It also optionally supports SSE2/SSE4.2 for acceleration.
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* RapidJSON is **self-contained** and **header-only**. It does not depend on external libraries such as BOOST. It even does not depend on STL.
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* 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.
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* 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).
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More features can be read [here](doc/features.md).
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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
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* [Introducing JSON](http://json.org/)
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* [RFC7159: The JavaScript Object Notation (JSON) Data Interchange Format](https://tools.ietf.org/html/rfc7159)
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* [Standard ECMA-404: The JSON Data Interchange Format](https://www.ecma-international.org/publications/standards/Ecma-404.htm)
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## Highlights in v1.1 (2016-8-25)
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* Added [JSON Pointer](doc/pointer.md)
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* Added [JSON Schema](doc/schema.md)
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* Added [relaxed JSON syntax](doc/dom.md) (comment, trailing comma, NaN/Infinity)
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* Iterating array/object with [C++11 Range-based for loop](doc/tutorial.md)
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* Reduce memory overhead of each `Value` from 24 bytes to 16 bytes in x86-64 architecture.
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For other changes please refer to [change log](CHANGELOG.md).
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## Compatibility
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RapidJSON is cross-platform. Some platform/compiler combinations which have been tested are shown as follows.
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* Visual C++ 2008/2010/2013 on Windows (32/64-bit)
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* GNU C++ 3.8.x on Cygwin
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* Clang 3.4 on Mac OS X (32/64-bit) and iOS
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* Clang 3.4 on Android NDK
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Users can build and run the unit tests on their platform/compiler.
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## Installation
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RapidJSON is a header-only C++ library. Just copy the `include/rapidjson` folder to system or project's include path.
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RapidJSON uses following software as its dependencies:
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* [CMake](https://cmake.org/) as a general build tool
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* (optional) [Doxygen](http://www.doxygen.org) to build documentation
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* (optional) [googletest](https://github.com/google/googletest) for unit and performance testing
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To generate user documentation and run tests please proceed with the steps below:
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1. Execute `git submodule update --init` to get the files of thirdparty submodules (google test).
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2. Create directory called `build` in rapidjson source directory.
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3. Change to `build` directory and run `cmake ..` command to configure your build. Windows users can do the same with cmake-gui application.
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4. On Windows, build the solution found in the build directory. On Linux, run `make` from the build directory.
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On successful build you will find compiled test and example binaries in `bin`
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directory. The generated documentation will be available in `doc/html`
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directory of the build tree. To run tests after finished build please run `make
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test` or `ctest` from your build tree. You can get detailed output using `ctest
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-V` command.
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It is possible to install library system-wide by running `make install` command
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from the build tree with administrative privileges. This will install all files
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according to system preferences. Once RapidJSON is installed, it is possible
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to use it from other CMake projects by adding `find_package(RapidJSON)` line to
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your CMakeLists.txt.
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## Usage at a glance
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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.
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~~~~~~~~~~cpp
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// rapidjson/example/simpledom/simpledom.cpp`
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#include "rapidjson/document.h"
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#include "rapidjson/writer.h"
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#include "rapidjson/stringbuffer.h"
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#include <iostream>
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using namespace rapidjson;
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int main() {
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// 1. Parse a JSON string into DOM.
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const char* json = "{\"project\":\"rapidjson\",\"stars\":10}";
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Document d;
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d.Parse(json);
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// 2. Modify it by DOM.
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Value& s = d["stars"];
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s.SetInt(s.GetInt() + 1);
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// 3. Stringify the DOM
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StringBuffer buffer;
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Writer<StringBuffer> writer(buffer);
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d.Accept(writer);
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// Output {"project":"rapidjson","stars":11}
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std::cout << buffer.GetString() << std::endl;
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return 0;
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}
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~~~~~~~~~~
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Note that this example did not handle potential errors.
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The following diagram shows the process.
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More [examples](https://github.com/Tencent/rapidjson/tree/master/example) are available:
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* DOM API
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* [tutorial](https://github.com/Tencent/rapidjson/blob/master/example/tutorial/tutorial.cpp): Basic usage of DOM API.
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* SAX API
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* [simplereader](https://github.com/Tencent/rapidjson/blob/master/example/simplereader/simplereader.cpp): Dumps all SAX events while parsing a JSON by `Reader`.
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* [condense](https://github.com/Tencent/rapidjson/blob/master/example/condense/condense.cpp): A command line tool to rewrite a JSON, with all whitespaces removed.
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* [pretty](https://github.com/Tencent/rapidjson/blob/master/example/pretty/pretty.cpp): A command line tool to rewrite a JSON with indents and newlines by `PrettyWriter`.
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* [capitalize](https://github.com/Tencent/rapidjson/blob/master/example/capitalize/capitalize.cpp): A command line tool to capitalize strings in JSON.
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* [messagereader](https://github.com/Tencent/rapidjson/blob/master/example/messagereader/messagereader.cpp): Parse a JSON message with SAX API.
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* [serialize](https://github.com/Tencent/rapidjson/blob/master/example/serialize/serialize.cpp): Serialize a C++ object into JSON with SAX API.
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* [jsonx](https://github.com/Tencent/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.
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* Schema
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* [schemavalidator](https://github.com/Tencent/rapidjson/blob/master/example/schemavalidator/schemavalidator.cpp) : A command line tool to validate a JSON with a JSON schema.
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* Advanced
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* [prettyauto](https://github.com/Tencent/rapidjson/blob/master/example/prettyauto/prettyauto.cpp): A modified version of [pretty](https://github.com/Tencent/rapidjson/blob/master/example/pretty/pretty.cpp) to automatically handle JSON with any UTF encodings.
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* [parsebyparts](https://github.com/Tencent/rapidjson/blob/master/example/parsebyparts/parsebyparts.cpp): Implements an `AsyncDocumentParser` which can parse JSON in parts, using C++11 thread.
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* [filterkey](https://github.com/Tencent/rapidjson/blob/master/example/filterkey/filterkey.cpp): A command line tool to remove all values with user-specified key.
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* [filterkeydom](https://github.com/Tencent/rapidjson/blob/master/example/filterkeydom/filterkeydom.cpp): Same tool as above, but it demonstrates how to use a generator to populate a `Document`.
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