annotate docs/rendered/_sources/pymonkey.txt @ 90:c41f1d2e8f9d

Added more docs.
author Atul Varma <varmaa@toolness.com>
date Fri, 14 Aug 2009 20:26:40 -0700
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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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15
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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 >>> cx.evaluate_script(cx.new_object(), '', '<string>', 1)
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28 pymonkey.undefined
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30 This object also has a "falsy" value:
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31
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32 >>> if not pymonkey.undefined:
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33 ... print "See, it's falsy!"
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34 See, it's falsy!
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36 .. class:: Object
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37
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38 This is the type of JavaScript objects. Such objects can only be
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39 created via Pymonkey calls like :meth:`Context.new_object()` or
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40 through the execution of JS code, but this type object can be used
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41 with Python's built-in :func:`isinstance()` to verify that an
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42 object is a JS object, like so:
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43
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44 >>> obj = pymonkey.Runtime().new_context().new_object()
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45 >>> isinstance(obj, pymonkey.Object)
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46 True
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48 .. method:: get_runtime()
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49
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50 Returns the :class:`Runtime` that the object belongs to.
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52 .. class:: Function
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53
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54 This is the type of JavaScript functions, which is a subtype of
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55 :class:`Object`.
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57 .. class:: Context
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59 This is the type of JavaScript context objects. Contexts can only
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60 be created via a call to :meth:`Runtime.new_context()`, but this
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61 type object can be used with Python's built-in :func:`isinstance()`
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62 to verify that an object is a context, like so:
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64 >>> cx = pymonkey.Runtime().new_context()
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65 >>> isinstance(cx, pymonkey.Context)
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66 True
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67
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68 .. method:: get_runtime()
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69
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70 Returns the :class:`Runtime` that the context belongs to.
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72 .. method:: new_object([private_obj])
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73
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74 Creates a new :class:`Object` instance and returns
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75 it. ``private_obj`` is any Python object that is privately
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76 stored within the new JS object; it can be retrieved using
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77 :meth:`get_object_private()`.
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79 .. method:: new_function(callable, name)
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80
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81 Creates a new :class:`Function` instance that wraps the
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82 given Python callable. In JS-land, the function will
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83 have the given name.
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85 When the function is executed from JavaScript, `callable`
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86 will be passed three positional arguments.
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87
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88 The first argument is a :class:`Context` that represents the
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89 JS context which is calling the function.
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90
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91 The second argument is an :class:`Object` that represents the
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92 value of ``this`` for the duration of the call.
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93
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94 The third argument is a tuple containing the arguments
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95 passed to the function.
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96
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97 .. method:: get_object_private(object)
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98
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99 Returns the ``private_obj`` passed to :meth:`new_object()`
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100 when `object` was first created. If it doesn't exist, ``None``
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101 is returned.
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102
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103 If `object` was created with :meth:`new_function()`, then this
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104 method returns the Python callable wrapped by `object`.
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105
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106 This functionality is useful if you want to securely represent
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107 Python objects in JS-land.
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108
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109 .. method:: clear_object_private(object)
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110
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111 Clears the ``private_obj`` passed to :meth:`new_object()`
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112 when `object` was first created. If it doesn't exist, this
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113 function returns nothing.
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114
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115 If `object` was created with :meth:`new_function()`, then this
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116 method effectively "unbinds" the Python callable wrapped by
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117 `object`. If `object` is later called, an exception will be
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118 raised.
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119
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120 .. method:: evaluate_script(globalobj, code, filename, lineno)
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121
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122 Evaluates the text `code` using `globalobj` as the global
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123 object/scope.
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124
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125 It's assumed that `code` is coming from the file named by `filename`;
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126 the first line of `code` is assumed to be line number `lineno` of
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127 `filename`. This metadata is very useful for debugging stack traces,
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128 exceptions, and so forth.
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129
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130 .. method:: call_function(thisobj, func, args)
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131
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132 Calls a JavaScript function.
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133
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134 `thisobj` is an :class:`Object` that will be used as the value
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135 of ``this`` when the function executes, `func` is the
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136 :class:`Function` to execute, and `args` is a tuple of arguments
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137 to pass to the function.
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138
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139 .. method:: init_standard_classes(object)
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140
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141 Defines the standard JavaScript classes on the given
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142 :class:`Object`, such as ``Array``, ``eval``, ``undefined``, and
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143 so forth. For more information, see the documentation to
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144 `JS_InitStandardClasses()
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145 <https://developer.mozilla.org/en/SpiderMonkey/JSAPI_Reference/JS_InitStandardClasses>`_,
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146 which this method wraps.
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147
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148 .. class:: Runtime()
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149
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150 Creates a new JavaScript runtime. JS objects created by the runtime
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151 may only interact with other JS objects of the same runtime.
51
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152
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153 .. method:: new_context()
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154
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155 Creates a new Context object and returns it. Contexts are best
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156 conceptualized as threads of execution in a JS runtme; each one
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157 has a program counter, a current exception state, and so
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158 forth. JS objects may be freely accessed and changed by contexts
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159 that are associated with the same JS runtime as the objects.