plugin.py
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# Name: plugin.py
# Purpose: Pluggable component support
# Author: Roman Rolinsky <rolinsky@femagsoft.com>
# Created: 31.05.2007
# RCS-ID: $Id: plugin.py 69876 2011-11-30 15:46:26Z ROL $
'''
Functions for loading plugins.
'''
import os, sys, glob
from xml.dom import minidom
from globals import *
from presenter import Manager
import component
import meta
def load_plugins_from_dirs():
'''Load plugins from XRCEDPATH directories.'''
dirs = os.getenv('XRCEDPATH')
if dirs:
for dir in dirs.split(':'):
if os.path.isdir(dir):
load_plugins(dir)
def load_plugins(dir):
'''Load plugins from C{dir}.'''
sys_path = sys.path
cwd = os.getcwd()
dir = os.path.abspath(os.path.normpath(dir))
TRACE('* load_plugins from %s' % dir)
os.chdir(dir)
sys.path = [dir] + sys_path
try: # try/finally shield
ff_py = glob.glob('[!_]*.py')
for f in ff_py:
name = os.path.splitext(f)[0]
TRACE('* __import__ %s', name)
try:
__import__(name, globals(), locals(), ['*'])
except ImportError:
logger.exception('importing %s failed', name)
ff_crx = glob.glob('*.crx')
for crx in ff_crx:
TRACE('* load_crx %s', crx)
try:
load_crx(crx)
except:
logger.exception('parsing CRX file %s failed', crx)
dirs = glob.glob('*/')
for dir in dirs:
if os.path.isfile(os.path.join(dir, '__init__.py')):
TRACE('* import __init__.py in %s', dir)
try:
__import__(dir, globals(), locals(), ['*'])
except ImportError:
logger.exception('importing __init__.py failed')
finally:
sys.path = sys_path
os.chdir(cwd)
def load_crx(filename):
'''Load components defined in a manifest file.'''
dom = minidom.parse(filename)
for node in dom.documentElement.childNodes:
if node.nodeType == node.ELEMENT_NODE and node.tagName == 'component':
create_component(node)
def create_component(node):
'''Create component from a manifest data.
@param node: DOM C{Element} object containing component manifest data.
'''
klass = node.getAttribute('class')
name = node.getAttribute('name')
TRACE('create_component %s', name)
comp = getattr(meta, klass)
compClass = getattr(component, comp.klass) # get component class
attributesIn = comp.getAttribute(node, 'attributes')
# Process attr:klass pairs
attributes = []
specials = {}
for a in attributesIn:
i = a.find(':')
if i != -1:
a,kl = a[:i],a[i+1:]
specials[a] = getattr(component, kl)
attributes.append(a)
attParamsIn = comp.getAttribute(node, 'params')
# Process attr:param_class pairs
params = {}
for a in attParamsIn:
i = a.find(':')
if i != -1:
a,kl = a[:i],a[i+1:]
params[a] = getattr(component.params, kl)
groups = comp.getAttribute(node, 'groups')
styles = comp.getAttribute(node, 'styles')
events = comp.getAttribute(node, 'events')
c = compClass(name, groups, attributes, specials=specials, params=params, events=events)
c.hasName = bool(comp.getAttribute(node, 'has-name'))
c.addStyles(*styles)
Manager.register(c)
menu = comp.getAttribute(node, 'menu')
label = comp.getAttribute(node, 'label')
if menu and label:
try:
index = int(comp.getAttribute(node, 'index'))
except:
index = 1000
help = comp.getAttribute(node, 'help')
Manager.setMenu(c, menu, label, help, index)
panel = comp.getAttribute(node, 'panel')
if panel:
try:
pos = map(int, comp.getAttribute(node, 'pos').split(','))
except:
pos = component.DEFAULT_POS
try:
span = map(int, comp.getAttribute(node, 'span').split(','))
except:
span = (1, 1)
Manager.setTool(c, panel, pos=pos, span=span)
dlName = comp.getAttribute(node, 'DL')
if dlName:
TRACE('Loading dynamic library: %s', dlName)
if not g._CFuncPtr:
try:
import ctypes
g._CFuncPtr = ctypes._CFuncPtr
except:
print 'import ctypes module failed'
if g._CFuncPtr:
dl = ctypes.CDLL(dlName)
try:
Manager.addXmlHandler(dl.AddXmlHandlers)
except:
logger.exception('DL registration failed')
module = comp.getAttribute(node, 'module')
handler = comp.getAttribute(node, 'handler')
if module and handler:
TRACE('importing handler %s from %s', handler, module)
try:
mod = __import__(module, globals(), locals(), [handler])
Manager.addXmlHandler(getattr(mod, handler))
except ImportError:
logger.exception("can't import handler module")
except AttributeError:
logger.exception("can't find handler class")