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# -*- coding: utf-8 -*-
#
# Copyright 2008 Simon Edwards <simon@simonzone.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as
# published by the Free Software Foundation; either version 2, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details
#
# You should have received a copy of the GNU Library General Public
# License along with this program; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
import sys
import os
import imp
class PlasmaImporter(object):
def __init__(self):
self.toplevel = {}
self.toplevelcount = {}
self.marker = '<plasma>' + str(id(self))
sys.path.append(self.marker)
sys.path_hooks.append(self.hook)
def hook(self,path):
if path==self.marker:
return self
else:
raise ImportError()
def register_top_level(self,name,path):
if name not in self.toplevel:
self.toplevelcount[name] = 1
self.toplevel[name] = path
else:
self.toplevelcount[name] += 1
def unregister_top_level(self,name):
value = self.toplevelcount[name]-1
self.toplevelcount[name] = value
if value==0:
del self.toplevelcount[name]
del self.toplevel[name]
for key in list(sys.modules.keys()):
if key==name or key.startswith(name+"."):
del sys.modules[key]
def find_module(self,fullname, path=None):
location = self.find_pymod(fullname)
if location is not None:
return self
else:
return None
# Find the given module in the plasma directory.
# Result a tuple on success otherwise None. The tuple contains the location
# of the module/package in disk and a boolean indicating if it is a package
# or module
def find_pymod(self,modulename):
parts = modulename.split('.')
toppackage = parts[0]
rest = parts[1:]
if toppackage in self.toplevel:
path = self.toplevel[toppackage]
if len(rest)==0:
# Simple top level Plasma package
return (path,True)
else:
restpath = apply(os.path.join,rest)
fullpath = os.path.join(path,'contents','code',restpath)
if os.path.isdir(fullpath):
return (fullpath,True)
elif os.path.exists(fullpath+'.py'):
return (fullpath+'.py',False)
else:
return None
def _get_code(self,location):
return open(location).read()
def load_module(self, fullname):
location,ispkg = self.find_pymod(fullname)
if ispkg: # Package dir.
initlocation = os.path.join(location,'__init__.py')
code = None
if os.path.isfile(initlocation):
code = open(initlocation)
else:
code = open(location)
mod = sys.modules.setdefault(fullname, imp.new_module(fullname))
mod.__file__ = location #"<%s>" % self.__class__.__name__
mod.__loader__ = self
if ispkg:
mod.__path__ = [self.marker]
if code is not None:
try:
exec code in mod.__dict__
finally:
code.close()
return mod
#plasma_importer = PlasmaImporter()
#plasma_importer.register_top_level('plasma_pyclock','/home/sbe/devel/python_plasma_2/test/plasma-pyclock')
#from plasma_pyclock import main
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