Python-Spidermonkey

Execute arbitrary JavaScript code from Python. Allows you to reference arbitrary Python objects and functions in the JavaScript VM

Installation

$ git clone git://github.com/davisp/python-spidermonkey.git
$ cd python-spidermonkey
$ python setup.py build
$ nosetests
$ sudo python setup.py develop

There are quite a few compiler warnings about casting pointers that I haven't gone back and fixed yet, so kindly ignore them. Or get irritated enough to fix them for me. :D

Basics

>>> import spidermonkey
>>> rt = spidermonkey.Runtime()
>>> cx = rt.create_context()
>>> print cx.execute("var x = 3; x *= 4; x;")
12
>>> class Orange(object):
...   def is_ripe(self,arg):
...       return "ripe %s" % arg
...
>>> fruit = Orange()
>>> cx.bind("apple", fruit)
>>> print cx.execute('"Show me the " + apple.is_ripe("raisin");')
Show me the ripe raisin

Global Namespace

>>> import spidermonkey
>>> class Monkey(object):
...     def __init__(self):
...         self.baz = "blammo"
...     def wrench(self, arg):
...         return "%s now wrenched" % arg
...
>>> monkey = Monkey()
>>> rt = spidermonkey.Runtime()
>>> cx = rt.create_context(monkey)
>>> cx.execute("baz;")
'blammo'
>>> cx.execute('wrench("ceiling fan");')
'ceiling fan now wrenched'
>>> cx.execute('doodad;')
Traceback (most recent call last):
    ...
JSError: JavaScript Error: Python(0): ReferenceError: doodad is not defined

Playing with Classes

>>> import spidermonkey
>>> class Monkey(object):
...     def __init__(self):
...         self.baz = "blammo"
...     def wrench(self, arg):
...         return "%s now wrenched" % arg
...
>>> rt = spidermonkey.Runtime()
>>> cx = rt.create_context()
>>> cx.install_class(Monkey)
<spidermonkey.ClassAdapter: <class '__main__.Monkey'>>
>>> monkey = cx.execute('var x = new Monkey(); x.baz = "blammo schmammo"; x;')
>>> monkey.baz
'blammo schmammo'
>>> monkey.__class__.__name__
'Monkey'

JavaScript Functions

>>> import spidermonkey
>>> rt = spidermonkey.Runtime()
>>> cx = rt.create_context()
>>> func = cx.execute('function(val) {return "whoosh: " + val;}')
>>> func("zipper!");
'whoosh: zipper!'

Previous Authors

• John J. Lee
• Atul Varma