Diff for "JythonDeveloperGuide"

BrianZimmer, incept: 2005-01-31

This is an introduction to developing Jython, just to get someone started. It doesn't cover the source code in any depth or discuss the design behind Jython. It's purely aimed at getting a development environment set up. It's definitely not complete so feel free to make it better!

SVN

• http://subversion.tigris.org/

• available on most *nix systems or with cygwin on Windows
• GUI clients are available on most platforms

• Eclipse users, see JythonDeveloperGuide/EclipseNotes

• can browse the current source archive at http://fisheye3.cenqua.com/browse/jython

• to obtain the a copy of the current development source, checkout from trunk:

  •     svn co https://svn.sourceforge.net/svnroot/jython/trunk/jython

  For 2.3, the development branch the next version:

  •     svn co https://svn.sourceforge.net/svnroot/jython/branches/2.3

• Patches should be posted to the [http://sourceforge.net/tracker/?group_id=12867&atid=312867 jython patch tracker] as forward unified diffs. This can be done for example using svn diff from the command line, just plain diff -u, or using the eclipse Team->Create Patch feature. [TODO: write better patch submission guidelines, similar to http://www.python.org/dev/patches/).

Python

• Jython uses the py files Python's standard library where possible. This means you will need a working copy of Python source files for the stdlib. The trunk uses Python 2.2 so you can grab the files from the source distribution [http://www.python.org/download/releases/2.2.3/ here] if you don't already have 2.2 installed. If you're going to work on the 2.3 branch, you'll want the release from [http://www.python.org/download/releases/2.3.6/ here].

Ant

• http://ant.apache.org/ A Java-based build tool.

• Eclipse users, see [wiki:/JythonDeveloperGuide/EclipseNotes Eclipse ANT notes]

• The Makefiles in the repository are old and will be removed.
• Download the latest version and install so the bin/ is somewhere in your path.
• The build.xml is the file containing the compiler directives
• It uses a file called ant.properties to override default paths; here's mine:

  •     build.compiler=modern
        debug=on
        optimize=off
    
        javaccHome=/Users/bzimmer/Library/Java/Extras/javacc-3.2
    
        ht2html.dir=
        #python.home=
        python.lib=/sw/lib/python2.2
        python.exe=/sw/bin/python2.2
    
        ### zxJDBC ###
        oracle.jar=
        mysql.jar=/Users/bzimmer/Library/Java/Extras/mysql-connector-java-3.1.6-bin.jar
        informix.jar=
        postgresql.jar=/Users/bzimmer/Library/Java/Extras/pg74.215.jdbc2.jar
        jdbc.jar=
        servlet.jar=

• ant.properties for Gentoo users:

  •     build.compiler=modern
        debug=on
        optimize=off
    
        python.lib=/usr/lib/python2.2/lib-old

• After getting Ant setup, run ant in your Jython checkout directory. That should produce dist/jython.jar if everything is setup correctly.

Tests

• After you've built the project, you may want to set up an excutable file on your path to make it easy to launch your build of jython. This file will need to:

• Set the python home property to the dist directory of your build (otherwise, you'll get import errors on the standard lib stuff).

• Execute the jython.jar in the dist produced by the build.

Here's a batch file that runs the built jython.jar (for windows): Anchor(sampleBatch)

:: jytip.bat
@echo off
set ARGS=

:: concatenate all the command line args into one
:loop
if [%1] == [] goto end
        set ARGS=%ARGS% %1
        shift
        goto loop
:end

:: this is mine...
:: java -Dpython.home=C:\\workspace\\JythonTip\\jython\\dist -jar 
::<cont> c:\workspace\JythonTip\jython\dist\jython.jar %ARGS%
:: fill in <placeholders> below:
java -Dpython.home=<path to dist directory>\\dist -jar <path to dist directory>\dist\jython.jar %ARGS%

On Unix you can use a shell script:

exec java -Dpython.home=<path>/dist/ -jar <path>/dist/jython.jar $*

Now you're ready to run tests...

• There are a couple different places to find test cases
  • Jython's dist/Lib/test

  • Jython's bugtests repository(svn co https://svn.sourceforge.net/svnroot/jython/trunk/bugtests to get this)

• Run a particular test or you can run the whole Python tes tsuite by running dist/Lib/regrtest.py with the -a option

Directory layout Note the following describes the current trunk. If you are working from an older tag, src doesn't exist and src/com and src/org are moved up a level.

• src/com : zxJDBC related sources"
• Demo : demo sources for the website and such"

• Doc : the website documentation(the current website actually lives in https://svn.sourceforge.net/svnroot/jython/trunk/website)"

• Lib : the python source files for Jython standard library implementations
• Lib/test : test cases
• Misc : random scripts which are not all used; some generate source
• src/org : top level package for python and apache (used for regex)
• Tools : JythonC and Freeze

Coding Guidance

• /PortingPythonModulesToJython : A good starting task for a Jython developer

• CodingStandards : The standards for writing Java code for Jython

• JythonModulesInJava : How to write a Jython module in Java

• JythonClassesInJava : How to write a Jython class in Java

Other Stuff

• /WebsiteBuilderSetup : How to get the pieces setup to edit and build the Jython website