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fangq / Jsonlab

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JSONLab: a native JSON/UBJSON/MassagePack encoder/decoder for MATLAB/Octave

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.. image:: ./images/jsonlab-banner.png

##############################################################################
JSONLab: An open-source MATLAB/Octave JSON encoder and decoder
##############################################################################

.. image:: https://travis-ci.com/fangq/jsonlab.svg?branch=master :target: https://travis-ci.com/fangq/jsonlab

################# Table of Contents ################# .. contents:: :local: :depth: 3

============ What's New

JSONLab v2.0 - code named "Magnus Prime" - is a stable release of JSONLab and a new milestone towards a stable, complete reference implementation of the JData Specification (http://openjdata.org) for portable scientific data storage.

There have been many major updates added to this release since the previous release v1.9.8 in Oct. 2019. A list of the major changes are summarized below (with key features marked by *), including the support to _ArrayShape_ to efficiently encode special matrices and the addition of jsave/jload to save and restore variables in MATLAB/Octave like the save/load commands (experimental):

  • 2020-06-13 [81feef3] skip no-op markers, update documentation
  • 2020-06-13 [4904155] jload load data to struct, test if loadbj input is buffer, update error msg
  • 2020-06-12 [c334799] change default workspace to caller for jload and jsave
  • 2020-06-10 [c883546] fix keeptype single integer bug
  • 2020-06-09*[ ] created jdata and bjdata python modules to share data with MATLAB
  • 2020-06-08*[cbde607] add savebj and loadbj to dedicate to loading and saving bjdata
  • 2020-06-08*[e2451e1] add unit testing script, fix issues found in the testing unit
  • 2020-06-06 [a44015f] accelerate fast_match_bracket, drop unicode2native for speed
  • 2020-06-06 [eefccf3] call jsonencode/decode in jsave/jload, parse embedded jdata struct
  • 2020-06-05 [9434103] support Toeplitz matrices, use case-insensitive comparison
  • 2020-06-04 [3119ce4] jdatadecode now handles ArrayOrder
  • 2020-06-04 [89b844c] remove forced root name, update internal test results
  • 2020-06-02*[15ca7ae] add keeptype option to jsave and saveubjson
  • 2020-06-02 [7f2cbc4] make jsave and jload work on octave
  • 2020-06-01*[8829d6b] apply data compression to strings, new datatype char
  • 2020-06-01 [270cbf6] fix loadmsgpack ND array issue
  • 2020-06-01*[919f502] add jsave and jload for portable data sharing,update doc
  • 2020-05-31 [df3a4fa] debug arrayshape related changes and test all demo scripts
  • 2020-05-31*[fc0b285] adding support to ArrayShape to record special matrices
  • 2020-05-15*[d88d454] jsonlab is compatible with matlab R2008
  • 2020-05-13 [86efe89] flag to prevent embedding ND array size specifier
  • 2020-05-07 [a189a50] use more robust integer type testing
  • 2020-05-06*[82f5249] saveubjson now implments BJData spec Draft1,https://github.com/fangq/bjdata
  • 2020-05-03 [34bca22] add prj file to compile a matlab package, close #60
  • 2020-05-03 [82dfdcc] handle empty array in loadmsgpack, fix #63, patch by stfnp
  • 2020-03-08 [7499bd8] Merge pull request #61 from j2L4e/patch-1
  • 2020-02-09*[6984111] add UseMap option to avoid key name conversion
  • 2019-11-16 [e46221a] if ArraySize has a single length, treat as a row vector
  • 2019-11-01 [f2bfb65] fix a uint8 upper bound bug
  • 2019-10-24 [cc4491d] avoid escaping base64 str, avoid double processing preencoded arrayzipdata
  • 2019-10-24 [4dc76ef] make example script compatible with matlab R2010
  • 2019-10-24 [ad8be26] disable underscore escaping in octave,update all tests and outputs
  • 2019-10-24 [d4275c6] reduce jsonopt calls to speed up encoding and decoding
  • 2019-10-23 [82c9e91] fix invalid jdatadecode example
  • 2019-10-23 [398539d] reoptimize for speed
  • 2019-10-22*[650b5ec] enable jdataencode in savejson and saveubjson

Please note that JSONLab v2.0 is now compliant with JData Spec Draft 3; in comparison v1.9.8 is compatible with Draft 2; v1.9 and previous releases are compatible with Draft 1. JSONLab v2.0 can read all data files generated by v1.9.8, but v1.9.8 can not read the new UBJSON markers introduced in v2.0.

The newly introduced jsave/jload functions are in the experimental stage. They generate .jamm files which are renamed binary-JData/UBJSON files; they can be 50% smaller than .mat files if using jsave(...,'compression','lzma') and can be readily opened among a long list of programming environments such as Python, JavaScript and Go.

The saveubjson/loadubjson functions added support to the Binary JData specification (BJData) v1 Draft-1 (https://github.com/fangq/bjdata) and are now renamed as savebj/loadbj (saveubjson/loadubjson are kept for compatibility purposes as aliases to the new functions). The BJData spec is largely compatible with UBJSON spec Draft 12, with the following differences (we are working with the UBJSON maintainer to merge these two specifications):

  • BJData adds 4 new numeric data types: uint16 [u], uint32 [m], uint64 [M] and float16 [h] ('''new in JSONLab v2.0''')
  • BJData supports an optimized ND array container (supported in JSONLab since 2013)
  • BJData does not convert NaN/Inf/-Inf to null (supported in JSONLab since 2013)

To avoid using the new type markers, one should attach 'UBJSON',1 in the savebj command as

.. code-block:: matlab

savebj('',data,'FileName','myfile.bjd','UBJSON',1);

To read data files generated by JSONLab v1.9 or older versions, you need to attach option 'FormatVersion', 1.9 in all the loadjson/savejson function calls.

To convert an older file (JSON/UBJSON) to the new format, you should run

.. code-block:: matlab

data=loadjson('my_old_data_file.json','FormatVersion',1.9) savejson('',data,'FileName','new_file.json')

You are strongly encouraged to convert all pre-v1.9.8 generated data files using the new format.

============ Introduction

JSONLab is a free and open-source JSON/UBJSON/MessagePack encoder and decoder written in the native MATLAB language. It can be used to convert a MATLAB data structure (array, struct, cell, struct array, cell array, and objects) into JSON/UBJSON/MessagePack formatted strings and files, or to parse a JSON/UBJSON/MessagePack file into MATLAB data structure. JSONLab supports both MATLAB and GNU Octave <http://www.gnu.org/software/octave>_ (a free MATLAB clone).

JSON (JavaScript Object Notation <http://www.json.org/>) is a highly portable, human-readable and "fat-free" <http://en.wikipedia.org/wiki/JSON> text format to represent complex and hierarchical data, widely used for data-exchange in applications. UBJSON (Universal Binary JSON <http://ubjson.org/>_) is a binary JSON format,
specifically designed to specifically address the limitations of JSON, permitting the storage of binary data with strongly typed data records, resulting in smaller file sizes and fast encoding and decoding. MessagePack is another binary JSON-like data format widely used in data exchange in web/native applications. It is slightly more compact than UBJSON, but is not directly readable compared to UBJSON.

We envision that both JSON and its binary counterparts will play important rules not only for light-weight data storage, but also for storage and interchange of scientific data. It has both the flexibility and generality as in other general-purpose file specifications, such as HDF5 <http://www.hdfgroup.org/HDF5/whatishdf5.html>_ but has significantly reduced complexity and excellent readability.

Towards this goal, we have developed the JData Specification (http://github.com/fangq/jdata) to standardize serializations of complex scientific data structures, such as N-D arrays, sparse/complex-valued arrays, trees, maps, tables and graphs using JSON/binary JSON constructs. The text and binary formatted JData files are syntactically compatible with JSON/UBJSON formats, and can be readily parsed using existing JSON and UBJSON parsers. JSONLab is not just a parser and writer of JSON/UBJSON data files, but one that systematically converts complex scientific data structures into human-readable and universally supported JSON forms using the standardized JData data annotations.

================ Installation

The installation of JSONLab is no different from installing any other MATLAB toolbox. You only need to download/unzip the JSONLab package to a folder, and add the folder's path to MATLAB/Octave's path list by using the following command:

.. code:: shell

addpath('/path/to/jsonlab');

If you want to add this path permanently, you can type pathtool, browse to the JSONLab root folder and add to the list, then click "Save". Then, run rehash in MATLAB, and type which savejson, if you see an output, that means JSONLab is installed for MATLAB/Octave.

If you use MATLAB in a shared environment such as a Linux server, the best way to add path is to type

.. code:: shell

mkdir ~/matlab/ nano ~/matlab/startup.m

and type addpath('/path/to/jsonlab') in this file, save and quit the editor. MATLAB will execute this file every time it starts. For Octave, the file you need to edit is ~/.octaverc, where ~ is your home directory.

To use the data compression features, please download the ZMat toolbox from https://github.com/fangq/zmat/releases/latest and follow the instruction to install ZMat first. The ZMat toolbox is required when compression is used on MATLAB running in the -nojvm mode or GNU Octave, or 'lzma/lzip/lz4/lz4hc' compression methods are specified. ZMat can also compress large arrays that MATLAB's Java-based compression API does not support.


Install JSONLab on Fedora 24 or later

JSONLab has been available as an official Fedora package since 2015. You may install it directly using the below command

.. code:: shell

sudo dnf install octave-jsonlab

To enable data compression/decompression, you need to install octave-zmat using

.. code:: shell

sudo dnf install octave-zmat

Then open Octave, and type pkg load jsonlab to enable jsonlab toolbox.


Install JSONLab on Debian

JSONLab is currently available on Debian unstable. To install, you may run

.. code:: shell

sudo apt-get install octave-jsonlab

One can alternatively install matlab-jsonlab if MATLAB is available.


Install JSONLab on Ubuntu

JSONLab is currently available on the below PPA for Ubuntu users:

https://launchpad.net/~fangq/+archive/ubuntu/ppa

To install, please run

.. code:: shell

sudo add-apt-repository ppa:fangq/ppa sudo apt-get update

to add this PPA, and then use

.. code:: shell

sudo apt-get install octave-jsonlab

to install the toolbox. octave-zmat will be automatically installed.


Install JSONLab on Arch Linux

JSONLab is also available on Arch Linux. You may install it using the below command

.. code:: shell

sudo pikaur -S jsonlab

================ Using JSONLab

JSONLab provides a pair of functions, loadjson -- a JSON parser, and savejson -- a MATLAB-to-JSON encoder, to read/write the text-based JSON; and two equivallent pairs -- loadubjson/saveubjson for binary JSON and loadmsgpack/savemsgpack for MessagePack. The load* functions for the 3 supported data formats share almost the same input parameter format; similarly for the 3 save* functions (savejson/saveubjson/savemsgpack) These encoders and decoders are capable of processing/sharing almost all data structures supported by MATLAB, thanks to jdataencode/jdatadecode - a pair of in-memory data converters translating complex data structures to the easy-to-serialized forms according to the JData specifications. The detailed help information can be found in the Contents.m file.

In the below section, we provide a few examples on how to us each of the core functions for encoding/decoding JSON/UBJSON/MessagePack data.


savejson.m

.. code-block:: matlab

   jsonmesh=struct('MeshNode',[0 0 0;1 0 0;0 1 0;1 1 0;0 0 1;1 0 1;0 1 1;1 1 1],... 
            'MeshElem',[1 2 4 8;1 3 4 8;1 2 6 8;1 5 6 8;1 5 7 8;1 3 7 8],...
            'MeshSurf',[1 2 4;1 2 6;1 3 4;1 3 7;1 5 6;1 5 7;...
                       2 8 4;2 8 6;3 8 4;3 8 7;5 8 6;5 8 7],...
            'MeshCreator','FangQ','MeshTitle','T6 Cube',...
            'SpecialData',[nan, inf, -inf]);
   savejson(jsonmesh)
   savejson('jmesh',jsonmesh)
   savejson('',jsonmesh,'Compact',1)
   savejson('jmesh',jsonmesh,'outputfile.json')
   savejson('',jsonmesh,'ArrayIndent',0,'FloatFormat','\t%.5g','FileName','outputfile2.json')
   savejson('cpxrand',eye(5)+1i*magic(5))
   savejson('ziparray',eye(10),'Compression','zlib','CompressArraySize',1)
   savejson('',jsonmesh,'ArrayToStruct',1)
   savejson('',eye(10),'UseArrayShape',1)

loadjson.m

.. code-block:: matlab

   loadjson('{}')
   dat=loadjson('{"obj":{"string":"value","array":[1,2,3]}}')
   dat=loadjson(['examples' filesep 'example1.json'])
   dat=loadjson(['examples' filesep 'example1.json'],'SimplifyCell',0)

savebj.m (saveubjson.m as an alias)

.. code-block:: matlab

   a={single(rand(2)), struct('va',1,'vb','string'), 1+2i};
   savebj(a)
   savebj('rootname',a,'testdata.ubj')
   savebj('zeros',zeros(100),'Compression','gzip')

loadbj.m (loadubjson.m as an alias)

.. code-block:: matlab

   obj=struct('string','value','array',single([1 2 3]),'empty',[],'magic',uint8(magic(5)));
   ubjdata=savebj('obj',obj);
   dat=loadbj(ubjdata)
   class(dat.obj.array)
   isequaln(obj,dat.obj)
   dat=loadbj(savebj('',eye(10),'Compression','zlib','CompressArraySize',1))

jdataencode.m

.. code-block:: matlab

  jd=jdataencode(struct('a',rand(5)+1i*rand(5),'b',[],'c',sparse(5,5)))
  savejson('',jd)

jdatadecode.m

.. code-block:: matlab

  rawdata=struct('a',rand(5)+1i*rand(5),'b',[],'c',sparse(5,5));
  jd=jdataencode(rawdata)
  newjd=jdatadecode(jd)
  isequaln(newjd,rawdata)

examples

Under the examples folder, you can find several scripts to demonstrate the basic utilities of JSONLab. Running the demo_jsonlab_basic.m script, you will see the conversions from MATLAB data structure to JSON text and backward. In jsonlab_selftest.m, we load complex JSON files downloaded from the Internet and validate the loadjson/savejson functions for regression testing purposes. Similarly, a demo_ubjson_basic.m script is provided to test the saveubjson and loadubjson functions for various matlab data structures, and demo_msgpack_basic.m is for testing savemsgpack and loadmsgpack.

Please run these examples and understand how JSONLab works before you use it to process your data.


unit testing

Under the test folder, you can find a script to test individual data types and inputs using various encoders and decoders. This unit testing script also serves as a specification validator to the JSONLab functions and ensure that the outputs are compliant to the underlying specifications.

================ Using jsave/jload to share workspace

Starting from JSONLab v2.0, we provide a pair of functions, jsave/jload to store and retrieve variables from the current workspace, similar to the save/load functions in MATLAB and Octave. The files that jsave/jload reads/writes is by
default a binary JData file with a suffix .jamm. The file size is comparable (can be smaller if use lzma compression) to .mat files. This feature is currently experimental.

The main benefits of using .jamm file to share matlab variables include

  • a .jamm file can be 50% smaller than a .mat file when using jsave(..., "compression","lzma"); the only drawback is longer saving time.
  • a .jamm file can be readily read/opened among many programming environments, including Python, JavaScript, Go, Java etc, where .mat file support is not generally available. Parsers of .jamm files are largely compatible with UBJSON's parsers available at http://ubjson.org/?page_id=48
  • a .jamm file is quasi-human-readable, one can see the internal data fields even in a command line, for example using strings -n 2 file.jamm | astyle, making the binary data easy to be understood, shared and reused.
  • jsave/jload can also use MessagePack and JSON formats as the underlying data storage format, addressing needs from a diverse set of applications. MessagePack parsers are readily available at https://msgpack.org/

jsave.m

.. code-block:: matlab

  jsave    % save the current workspace to jamdata.jamm
  jsave mydata.jamm
  jsave('mydata.jamm','vars',{'var1','var2'})
  jsave('mydata.jamm','compression','lzma')
  jsave('mydata.json','compression','gzip')

jload.m

.. code-block:: matlab

  jload    % load variables from jamdata.jamm to the current workspace
  jload mydata.jamm   % load variables from mydata.jamm
  vars=jload('mydata.jamm','vars',{'var1','var2'}) % return vars.var1, vars.var2
  jload('mydata.jamm','simplifycell',0)
  jload('mydata.json')

================ Sharing JSONLab created data files in Python

Despite the use of portable data annotation defined by the JData Specification, the output JSON files created by JSONLab are 100% JSON compatible (with the exception that long strings may be broken into multiple lines for better readability). Therefore, JSONLab-created JSON files (.json, .jnii, .jnirs etc) can be readily read and written by nearly all existing JSON parsers, including the built-in json module parser in Python.

However, we strongly recommend one to use a lightweight jdata module, developed by the same author, to perform the extra JData encoding and decoding and convert JSON data directly to convenient Python/Numpy data structures. The jdata module can also directly read/write UBJSON/Binary JData outputs from JSONLab (.bjd, .ubj, .bnii, .bnirs, .jamm etc). Using binary JData files are exptected to produce much smaller file sizes and faster parsing, while maintainining excellent portability and generality.

In short, to conveniently read/write data files created by JSONLab into Python, whether they are JSON based or binary JData/UBJSON based, one just need to download the below two light-weight python modules:

To install these modules on Python 2.x, please first check if your system has pip and numpy, if not, please install it by running (using Ubuntu/Debian as example)

.. code-block:: shell

  sudo apt-get install python-pip python3-pip python-numpy python3-numpy

After the installation is done, one can then install the jdata and bjdata modules by

.. code-block:: shell

  pip install jdata --user
  pip install bjdata --user

To install these modules for Python 3.x, please replace pip by pip3. If one prefers to install these modules globally for all users, simply execute the above commands using

.. code-block:: shell

  sudo pip install jdata
  sudo pip install bjdata

The above modules require built-in Python modules json and NumPy (numpy).

Once the necessary modules are installed, one can type python (or python3), and run

.. code-block:: python

  import jdata as jd
  import numpy as np
  from collections import OrderedDict

  data1=jd.loadt('myfile.json',object_pairs_hook=OrderedDict);
  data2=jd.loadb('myfile.ubj',object_pairs_hook=OrderedDict);
  data3=jd.loadb('myfile.jamm',object_pairs_hook=OrderedDict);

where jd.loadt() function loads a text-based JSON file, performs JData decoding and converts the enclosed data into Python dict, list and numpy objects. Similarly, jd.loadb() function loads a binary JData/UBJSON file and performs similar conversions. One can directly call jd.load() to open JSONLab (and derived toolboxes such as jnifti: https://github.com/fangq/jnifti or jsnirfy: https://github.com/fangq/jsnirfy) generated files based on their respective file suffix.

Similarly, the jd.savet(), jd.saveb() and jd.save functions can revert the direction and convert a Python/Numpy object into JData encoded data structure and store as text-, binary- and suffix-determined output files, respectively.

======================= Known Issues and TODOs

JSONLab has several known limitations. We are striving to make it more general and robust. Hopefully in a few future releases, the limitations become less.

Here are the known issues:

  • 3D or higher dimensional cell/struct-arrays will be converted to 2D arrays
  • When processing names containing multi-byte characters, Octave and MATLAB can give different field-names; you can use feature('DefaultCharacterSet','latin1') in MATLAB to get consistant results
  • savejson can only export the properties from MATLAB classes, but not the methods
  • saveubjson converts a logical array into a uint8 ([U]) array
  • a special N-D array format, as defined in the JData specification, is implemented in saveubjson. You may use saveubjson(...,'NestArray',1) to create UBJSON Draft-12 compliant files
  • loadubjson can not parse all UBJSON Specification (Draft 12) compliant files, however, it can parse all UBJSON files produced by saveubjson.

========================== Contribution and feedback

JSONLab is an open-source project. This means you can not only use it and modify it as you wish, but also you can contribute your changes back to JSONLab so that everyone else can enjoy the improvement. For anyone who want to contribute, please download JSONLab source code from its source code repositories by using the following command:

.. code:: shell

  git clone https://github.com/fangq/jsonlab.git jsonlab

or browsing the github site at

  https://github.com/fangq/jsonlab

Please report any bugs or issues to the below URL:

  https://github.com/fangq/jsonlab/issues

Sometimes, you may find it is necessary to modify JSONLab to achieve your goals, or attempt to modify JSONLab functions to fix a bug that you have encountered. If you are happy with your changes and willing to share those changes to the upstream author, you are recommended to create a pull-request on github.

To create a pull-request, you first need to "fork" jsonlab on Github by clicking on the "fork" button on top-right of jsonlab's github page. Once you forked jsonlab to your own directory, you should then implement the changes in your own fork. After thoroughly testing it and you are confident the modification is complete and effective, you can then click on the "New pull request" button, and on the left, select fangq/jsonlab as the "base". Then type in the description of the changes. You are responsible to format the code updates using the same convention (tab-width: 8, indentation: 4 spaces) as the upstream code.

We appreciate any suggestions and feedbacks from you. Please use the following mailing list to report any questions you may have regarding JSONLab:

  https://github.com/fangq/jsonlab/issues

(Subscription to the mailing list is needed in order to post messages).

========================== Acknowledgement


loadjson.m

The loadjson.m function was significantly modified from the earlier parsers (BSD 3-clause licensed) written by the below authors


loadmsgpack.m

Copyright (c) 2014,2016 Bastian Bechtold All rights reserved.

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 the copyright holder 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.


zlibdecode.m, zlibencode.m, gzipencode.m, gzipdecode.m, base64encode.m, base64decode.m

Copyright (c) 2012, Kota Yamaguchi All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

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