WebKit.PlugIn | index /usr/local/share/webware/WebKit/PlugIn.py

Modules

``

WebUtils | os | sys | time

Classes

``

WebKit.Object.Object(__builtin__.object, MiscUtils.NamedValueAccess.NamedValueAccess)
  PlugIn
exceptions.Exception(exceptions.BaseException)
  PlugInError

class PlugIn(WebKit.Object.Object)

``

`Template for Webware Plug-ins.
A plug-in is a software component that is loaded by WebKit in order to
provide additional WebKit functionality without necessarily having to modify
WebKit's source. The most infamous plug-in is PSP (Python Server Pages)
which ships with Webware.
Plug-ins often provide additional servlet factories, servlet subclasses,
examples and documentation. Ultimately, it is the plug-in author's choice
as to what to provide and in what manner.
Instances of this class represent plug-ins which are ultimately Python
packages (see the Python Tutorial, 6.4: "Packages" at
http://docs.python.org/tut/node8.html#SECTION008400000000000000000).
A plug-in must also be a Webware component which means that it will have
a Properties.py file advertising its name, version, requirements, etc.
You can ask a plug-in for its properties().
The plug-in/package must have an __init__.py while must contain a function:
def InstallInWebKit(appServer):
This function is invoked to take whatever actions are needed to plug the
new component into WebKit. See PSP for an example.
If you ask an AppServer for its plugIns(), you will get a list of instances
of this class.
The path of the plug-in is added to sys.path, if it's not already there.
This is convenient, but we may need a more sophisticated solution in the
future to avoid name collisions between plug-ins.
Note that this class is hardly ever subclassed. The software in the
plug-in package is what provides new functionality and there is currently
no way to tell AppServer to use custom subclasses of this class on a
case-by-case basis (and so far there is currently no need).
Instructions for invoking:
p = PlugIn(self, '../Foo') # 'self' is typically AppServer. It gets passed to InstallInWebKit()
willNotLoadReason = plugIn.load()
if willNotLoadReason:
print ' Plug-in %s cannot be loaded because:
%s' % (path, willNotLoadReason)
return None
p.install()
# Note that load() and install() could raise exceptions. You should expect this.
`

Method resolution order:
  PlugIn
  WebKit.Object.Object
  __builtin__.object
  MiscUtils.NamedValueAccess.NamedValueAccess

Methods defined here:

__init__(self, appServer, path)
  `Initializes the plug-in with basic information.
  This lightweight constructor does not access the file system.`

directory(self)
  `Return the directory in which the plug-in resides. Example: '..'`

docs(self)

docsContext(self)

examplePages(self)

examplePagesContext(self)

hasDocs(self)

hasExamplePages(self)

install(self)
  `Install plug-in by invoking its required InstallInWebKit function.`

load(self)
  `Loads the plug-in into memory, but does not yet install it.
  Will return None on success, otherwise a message (string) that says
  why the plug-in could not be loaded.`

module(self)
  `Return the Python module object of the plug-in.`

name(self)
  `Return the name of the plug-in. Example: 'Foo'`

path(self)
  `Return the full path of the plug-in. Example: '../Foo'`

properties(self)
  `Return the properties.
  This is a dictionary-like object, of the plug-in which comes
  from its Properties.py file. See MiscUtils.PropertiesObject.py.`

serverSidePath(self, path=None)

setUpDocContext(self)
  `Add a context for the documentation.`

setUpExamplePages(self)
  `Add a context for the examples.`

Methods inherited from WebKit.Object.Object:

deprecated(self, method)
  `Output a deprecation warning.
  The implementation of WebKit sometimes invokes this method which prints
  a warning that the method you are using has been deprecated.
  This method expects that deprecated methods say so at the beginning of
  their doc string and terminate that msg with @. For example:
  DEPRECATED: Class.foo() on 01/24/01 in ver 0.5. Use Class.bar() instead. @
  Putting this information in the doc string is important for accuracy
  in the generated docs.
  Example call:
  deprecated(self.foo)`

Data descriptors inherited from WebKit.Object.Object:

__dict__
  `dictionary for instance variables (if defined)`

__weakref__
  `list of weak references to the object (if defined)`

Methods inherited from MiscUtils.NamedValueAccess.NamedValueAccess:

handleUnknownSetKey(self, key)

hasValueForKey(self, key)
  `Check whether key is available.
  Returns true if the key is available, although that does not guarantee
  that there will not be errors caused by retrieving the key.`

hasValueForName(self, keysString)
  `Check whether name is available.`

resetKeyBindings(self)
  `Rest all key bindings, releasing alreaedy referenced values.`

setValueForKey(self, key, value)
  `Set value for a given key.
  Suppose key is 'foo'.
  This method sets the value with the following precedence:
  1. Public attributes before private attributes
  2. Methods before non-methods
  More specifically, this method then uses one of the following:
  @@ 2000-03-04 ce: fill in
  ... or invokes handleUnknownSetKey().`

valueForKey(self, key, default=<class MiscUtils.NoDefault at 0x832da1c>)
  `Get value for given key.
  Suppose key is 'foo'.
  This method returns the value with the following precedence:
  1. Methods before non-methods
  2. Public attributes before private attributes
  More specifically, this method then returns one of the following:
  * foo()
  * _foo()
  * self.foo
  * self._foo
  ... or default, if it was specified,
  otherwise invokes and returns result of valueForUnknownKey().
  Note that valueForUnknownKey() normally returns an exception.
  See valueForName() which is a more advanced version of this method
  that allows multiple, qualified keys.`

valueForKeySequence(self, listOfKeys, default=None)
  `Get the value for the given list of keys.`

valueForName(self, keysString, default=None)
  `Get the value for the given keysString.
  This is the more advanced version of valueForKey(), which can only
  handle single names. This method can handle
  'foo', 'foo1.foo2', 'a.b.c.d', etc.
  It will traverse dictionaries if needed.`

valueForUnknownKey(self, key, default)

valuesForNames(self, keys, default=None, defaults=None, forgive=0, includeNames=0)
  `Get all values for given names.
  Returns a list of values that match the given keys, each of which is
  passed through valueForName() and so could be of the form 'a.b.c'.
  keys and defaults are sequences.
  default is any kind of object.
  forgive and includeNames are flags.
  If default is not None, then it is substituted when a key is not found.
  Otherwise, if defaults is not None, then it's corresponding/parallel
  value for the current key is substituted when a key is not found.
  Otherwise, if forgive is true, then unknown keys simply don't produce
  any values.
  Otherwise, if default and defaults are None, and forgive is false,
  then the unknown keys will probably raise an exception through
  valueForUnknownKey() although that method can always return
  a final, default value.
  if keys is None, then None is returned.
  If keys is an empty list, then None is returned.
  Often these last four arguments are specified by key.
  Examples:
  names = ['origin.x', 'origin.y', 'size.width', 'size.height']
  obj.valuesForNames(names)
  obj.valuesForNames(names, default=0.0)
  obj.valuesForNames(names, defaults=[0.0, 0.0, 100.0, 100.0])
  obj.valuesForNames(names, forgive=0)
  @@ 2000-03-04 ce: includeNames is only supported when forgive=1.
  It should be supported for the other cases.
  It should be documented.
  It should be included in the test cases.`

class PlugInError(exceptions.Exception)

``

Method resolution order:
  PlugInError
  exceptions.Exception
  exceptions.BaseException
  __builtin__.object

Data descriptors defined here:

__weakref__
  `list of weak references to the object (if defined)`

Methods inherited from exceptions.Exception:

__init__(...)
  `x.__init__(...) initializes x; see x.__class__.__doc__ for signature`

Data and other attributes inherited from exceptions.Exception:

__new__ = <built-in method __new__ of type object at 0x8118b60>
  `T.__new__(S, ...) -> a new object with type S, a subtype of T`

Methods inherited from exceptions.BaseException:

__delattr__(...)
  `x.__delattr__('name') <==> del x.name`

__getattribute__(...)
  `x.__getattribute__('name') <==> x.name`

__getitem__(...)
  `x.__getitem__(y) <==> x[y]`

__getslice__(...)
  `x.__getslice__(i, j) <==> x[i:j]
  Use of negative indices is not supported.`

__reduce__(...)

__repr__(...)
  `x.__repr__() <==> repr(x)`

__setattr__(...)
  `x.__setattr__('name', value) <==> x.name = value`

__setstate__(...)

__str__(...)
  `x.__str__() <==> str(x)`

Data descriptors inherited from exceptions.BaseException:

__dict__

args

message
  `exception message`

Functions

``

StringIO(...)
  `StringIO([s]) -- Return a StringIO-like stream for reading or writing`