DDevelopment & Design

TouK on WGK 2011 – update

I National Conference on Computer Games Development in Gdańsk is officially over. Three days with polish game dev, technical lectures and challenging 8 hour game programming contest. TouK as one of the lecturers presented comparison between two worlds: “Developing business web applications and producing rich browser based games”. Both, media presentation and technical paper are available below (polish version only) WGK 2011 was also first spot where gamers and developers could check out “Project Ark” – rich space MMO browser web game project, based on open Java solutions (GWT, Spring, Hibernate) and common web standards (HTML/CSS/javascript). Project is developed in spare time by small team of coworkers of TouK. We will try to add some media presentation soon.

Technical paper

[Media presentation

]

2 Technical paper summary:

> Development process comparison between business web application and advanced browser based games. Presentation will touch many aspects of development process starting from analysis and technical design, through implementation, testing and final deployment, with attention to project management and business model. Very important part of presentation will discuss Open Source solutions and consequences of their use. Web game development process will be presented on example of ongoing Project Ark. It is rich space MMO browser web game project, based on open Java solutions and common web standards (HTML/CSS/javascript). It is developed in spare time by small team of coworkers of TouK IT company (www.touk.pl). >

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DDevelopment & Design

Need to make a quick json fixes – JSONPath for rescue

From time to time I have a need to do some fixes in my json data. In a world of flat files I do this with grep/sed/awk tool chain. How to handle it for JSON? Searching for a solution I came across the JSONPath. It quite mature tool (from 2007) but I haven't hear about it so I decided to share my experience with others.

First of all you can try it without pain online: http://jsonpath.curiousconcept.com/. Full syntax is described at http://goessner.net/articles/JsonPath/



But also you can download python binding and run it from command line:
$ sudo apt-get install python-jsonpath-rw
$ sudo apt-get install python-setuptools
$ sudo easy_install -U jsonpath

After that you can use inside python or with simple cli wrapper:
#!/usr/bin/python
import sys, json, jsonpath

path = sys.argv[1]

result = jsonpath.jsonpath(json.load(sys.stdin), path)
print json.dumps(result, indent=2)

… you can use it in your shell e.g. for json:
{
"store": {
"book": [
      {
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
      },
      {
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
      },
      {
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
      },
      {
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
      }
    ],
"bicycle": {
"color": "red",
"price": 19.95
    }
  }
}

You can print only book nodes with price lower than 10 by:
$ jsonpath '$..book[?(@.price

Result:
[
  {
"category": "reference",
"price": 8.95,
"title": "Sayings of the Century",
"author": "Nigel Rees"
  },
  {
"category": "fiction",
"price": 8.99,
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"author": "Herman Melville"
  }
]

Have a nice JSON hacking!From time to time I have a need to do some fixes in my json data. In a world of flat files I do this with grep/sed/awk tool chain. How to handle it for JSON? Searching for a solution I came across the JSONPath. It quite mature tool (from 2007) but I haven't hear about it so I decided to share my experience with others.