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Added docs for pymonkey.undefined.
author Atul Varma <varmaa@toolness.com>
date Fri, 10 Jul 2009 17:22:42 -0700
parents 2055d853b995
children 40a404b9c467
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1 :mod:`pymonkey` --- Access SpiderMonkey from Python
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2 ===================================================
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4 .. module:: pymonkey
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5 :synopsis: Access SpiderMonkey from Python
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7 .. testsetup:: *
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9 import pymonkey
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11 This module offers a low-level interface to the `Mozilla SpiderMonkey
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12 <https://developer.mozilla.org/en/SpiderMonkey>`_ JavaScript engine.
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14 .. exception:: error
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16 This is the type of any SpiderMonkey-related errors thrown by this
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17 module.
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18
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19 .. data:: undefined
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20
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21 This is the singleton that represents the JavaScript value
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22 ``undefined``, as Python has no equivalent representation
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23 (JavaScript's ``null`` is mapped to Python's ``None`` object).
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24 For instance:
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25
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26 >>> cx = pymonkey.Runtime().new_context()
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27 >>> obj = cx.new_object()
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28 >>> cx.evaluate_script(obj, '', '<string>', 1)
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29 <type 'pymonkey.undefined'>
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30
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31 Unfortunately, this object currently does not have a "falsy" value,
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32 e.g.:
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33
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34 >>> if (pymonkey.undefined):
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35 ... print 'Huh, this is kind of unintuitive.'
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36 Huh, this is kind of unintuitive.
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37
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38 The reason for this is simply that we don't currently know how to
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39 make this object have a falsy value, if it's even possible.
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40
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41 .. class:: Object
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42
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43 This is the type of JavaScript objects. Such objects can only be
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44 created via Pymonkey calls like :meth:`Context.new_object()` or
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45 through the execution of JS code, but this type object can be used
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46 with Python's built-in :func:`isinstance()` to verify that an
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47 object is a JS object, like so:
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48
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49 >>> obj = pymonkey.Runtime().new_context().new_object()
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50 >>> isinstance(obj, pymonkey.Object)
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51 True
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53 .. class:: Context
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55 This is the type of JavaScript context objects. Contexts can only
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56 be created via a call to :meth:`Runtime.new_context()`, but this
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57 type object can be used with Python's built-in :func:`isinstance()`
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58 to verify that an object is a context, like so:
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60 >>> cx = pymonkey.Runtime().new_context()
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61 >>> isinstance(cx, pymonkey.Context)
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62 True
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64 .. class:: Runtime()
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66 Creates a new JavaScript runtime. JS objects created by the runtime
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67 may only interact with other JS objects of the same runtime.
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69 .. method:: new_context()
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71 Creates a new Context object and returns it. Contexts are best
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72 conceptualized as threads of execution in a JS runtme; each one
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73 has a program counter, a current exception state, and so
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74 forth. JS objects may be freely accessed and changed by contexts
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75 that are associated with the same JS runtime as the objects.