pjs/extensions/python/xpcom/server/loader.py

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4.8 KiB
Python

# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is the Python XPCOM language bindings.
#
# The Initial Developer of the Original Code is
# Activestate Tool Corp.
# Portions created by the Initial Developer are Copyright (C) 2000
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
# Mark Hammond <MarkH@ActiveState.com>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****
import xpcom
from xpcom import components, nsError
import xpcom.shutdown
import module
import os, types
def _has_good_attr(object, attr):
# Actually allows "None" to be specified to disable inherited attributes.
return getattr(object, attr, None) is not None
def FindCOMComponents(py_module):
# For now, just run over all classes looking for likely candidates.
comps = []
for name, object in py_module.__dict__.items():
if type(object)==types.ClassType and \
_has_good_attr(object, "_com_interfaces_") and \
_has_good_attr(object, "_reg_clsid_") and \
_has_good_attr(object, "_reg_contractid_"):
comps.append(object)
return comps
def register_self(klass, compMgr, location, registryLocation, componentType):
pcl = ModuleLoader
from xpcom import _xpcom
svc = _xpcom.GetServiceManager().getServiceByContractID("@mozilla.org/categorymanager;1", components.interfaces.nsICategoryManager)
# The category 'module-loader' is special - the component manager uses it
# to create the nsIModuleLoader for a given component type.
svc.addCategoryEntry("module-loader", pcl._reg_component_type_, pcl._reg_contractid_, 1, 1)
# The Python module loader. Called by the component manager when it finds
# a component of type self._reg_component_type_. Responsible for returning
# an nsIModule for the file.
class ModuleLoader:
_com_interfaces_ = components.interfaces.nsIModuleLoader
_reg_clsid_ = "{945BFDA9-0226-485e-8AE3-9A2F68F6116A}" # Never copy these!
_reg_contractid_ = "@mozilla.org/module-loader/python;1"
_reg_desc_ = "Python module loader"
# Optional function which performs additional special registration
# Appears that no special unregistration is needed for ModuleLoaders, hence no unregister function.
_reg_registrar_ = (register_self,None)
# Custom attributes for ModuleLoader registration.
_reg_component_type_ = "application/x-python"
def __init__(self):
self.com_modules = {} # Keyed by module's FQN as obtained from nsIFile.path
self.moduleFactory = module.Module
xpcom.shutdown.register(self._on_shutdown)
def _on_shutdown(self):
self.com_modules.clear()
def loadModule(self, aFile):
return self._getCOMModuleForLocation(aFile)
def _getCOMModuleForLocation(self, componentFile):
fqn = componentFile.path
if not fqn.endswith(".py"):
raise xpcom.ServerException(nsError.NS_ERROR_INVALID_ARG)
mod = self.com_modules.get(fqn)
if mod is not None:
return mod
import ihooks, sys
base_name = os.path.splitext(os.path.basename(fqn))[0]
loader = ihooks.ModuleLoader()
module_name_in_sys = "component:%s" % (base_name,)
stuff = loader.find_module(base_name, [componentFile.parent.path])
assert stuff is not None, "Couldn't find the module '%s'" % (base_name,)
py_mod = loader.load_module( module_name_in_sys, stuff )
# Make and remember the COM module.
comps = FindCOMComponents(py_mod)
mod = self.moduleFactory(comps)
self.com_modules[fqn] = mod
return mod