RapidJSON bindings for Lua

A json module for LuaJIT 2.0/2.1 and Lua 5.1/5.2/5.3, based on the very fast RapidJSON C++ library.

See project homepage for more information, bug report and feature request.

Dependencies

• lua development environment
  • lua-devel (linux)
  • or luavm(windows)
  • or brew install lua luarocks
  • or any equivalent on your system
• cmake >= 3.1.0, cmake 2.8 may work but not well tested.

Usage

luarocks install rapidjson

or if you like to use your own version of RapidJSON, use:

luarocks install rapidjson RAPIDJSON_INCLUDE_DIRS=path/to/rapidjson/include/dir

local rapidjson = require('rapidjson')

rapidjson.encode()
rapidjson.decode()

rapidjson.load()
rapidjson.dump()

Usage without luarocks

1. Use cmake -H. -Bbuild -G<generator-name> go generate project.

   If you use a non standard lua install location, add environment variable LUA_DIR to the directory contains include and lib for you lua installation. eg.

   LUA_DIR=/usr/local/openresty/luajit cmake -H. -Bbuild -G<generator-name>

2. cmake --build build --config Release to build the rapidjosn.so or rapidjosn.dll library.

3. Then link that library to you project or copy to desired place.

Tips: use cmake --help to see a list of generator-name available.

Value Type Mappings

Test

Clone or download source code, in the project root folder:

luarocks install luautf8
luarocks install busted
luarocks make
busted

Performance

To compare speed of rapidjson and other json libraries:

lua performance/run.lua

The result on my Macbook Pro shows:

• For decoding, lua-rapidjson is slightly faster than lua-cjson in most cases.
• For encoding, lua-rapidjson is always faster than lua-cjson, and much faster when encoding numbers.

API

See API reference.

Release Steps

1. Pass all unit tests.
2. Update version in rapidjson-..*-1.rockspec and update the name of the rockspec file.
3. Tag source code with that version (v..*), and push.
4. luarocks upload rapidjson-*.*.*-1.rockspec

Changelog

0.7.0

• Change the rapidjson.null type to lightuserdata and fixes the issue when it accessed by different Lua States.

0.6.1

• Try support cmake 2.8 with GCC (but still requires c++ compiler support c++11 or at least c++0x).

0.6.0

• Add support for decode C buffer + length.
• Export C++ API pushDecoded.

0.5.2

• Check lua stack when decoding objects and arrays to ensure there is room (Thanks Matthew Johnson).

0.5.1

• Remove all c++11 feature requirements except move constructor.

0.5.0

• Added Document SchemaDocument SchemaValidator to support JSON pointer and schema.

0.4.5

• Checks encoding error for float point numbers.
• RapidJSON compiling turn: use release config and turn SIMD on if supported.

0.4.4

• Fixes build and test errors introduced in 0.4.3.

0.4.3

• CMakeLists.txt supports command line defined RAPIDJSON_INCLUDE_DIRS to specified RapidJSON include directory.
• Keeps only necessary RapidJSON header files and docs make the rock much smaller.

0.4.2

• Update RapidJSON to latest HEAD version.

0.4.1

• Fixes Windows dll.

0.4.0

• Checks circular reference when encoding tables.
• A table is encoded as json array if:
  • have meta field __jsontype set to 'array'.
  • don't have meta filed __jsontype and length > 0.
• When table is encoded as json object, only string keys and its values are encoded.
• Integers are decoded to lua_Integer if it can be stored in lua_Integer.

0.3.0

• Follow integers are encoded as integers.
  • Lua 5.3 integers.
  • Integers stored in double and in between:
  • [INT64_MIN..INT64_MAX] on 64 bit Lua or
  • [INT32_MIN..INT32_MAX] in 32 bit Lua.
• CI scripts updated, thanks @ignacio

0.2.0

• Rename module to rapidjson.
• Added option.sort_keys option to rapidjson.encode() and rapidjson.dump(), and default value for sort_keys is false.
• Added rapidjson._NAME ("rapidjson") and rapidjson._VERSION.
• rapidjson.object() and rapidjson.array() just set metatable field __jsontype to 'object' and 'array' if passed table already have a metatable.
• fixes dump return value of false rather than nil.

0.1.0

• Initial release.