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360 lines
11 KiB
Python
360 lines
11 KiB
Python
"""Tools for use in AppleEvent clients and servers.
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pack(x) converts a Python object to an AEDesc object
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unpack(desc) does the reverse
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packevent(event, parameters, attributes) sets params and attrs in an AEAppleEvent record
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unpackevent(event) returns the parameters and attributes from an AEAppleEvent record
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Plus... Lots of classes and routines that help representing AE objects,
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ranges, conditionals, logicals, etc., so you can write, e.g.:
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x = Character(1, Document("foobar"))
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and pack(x) will create an AE object reference equivalent to AppleScript's
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character 1 of document "foobar"
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Some of the stuff that appears to be exported from this module comes from other
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files: the pack stuff from aepack, the objects from aetypes.
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"""
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from types import *
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from Carbon import AE
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from Carbon import Evt
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from Carbon import AppleEvents
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import MacOS
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import sys
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import time
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from aetypes import *
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from aepack import packkey, pack, unpack, coerce, AEDescType
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Error = 'aetools.Error'
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# Amount of time to wait for program to be launched
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LAUNCH_MAX_WAIT_TIME=10
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# Special code to unpack an AppleEvent (which is *not* a disguised record!)
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# Note by Jack: No??!? If I read the docs correctly it *is*....
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aekeywords = [
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'tran',
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'rtid',
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'evcl',
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'evid',
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'addr',
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'optk',
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'timo',
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'inte', # this attribute is read only - will be set in AESend
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'esrc', # this attribute is read only
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'miss', # this attribute is read only
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'from' # new in 1.0.1
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]
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def missed(ae):
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try:
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desc = ae.AEGetAttributeDesc('miss', 'keyw')
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except AE.Error, msg:
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return None
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return desc.data
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def unpackevent(ae, formodulename=""):
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parameters = {}
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try:
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dirobj = ae.AEGetParamDesc('----', '****')
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except AE.Error:
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pass
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else:
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parameters['----'] = unpack(dirobj, formodulename)
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del dirobj
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# Workaround for what I feel is a bug in OSX 10.2: 'errn' won't show up in missed...
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try:
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dirobj = ae.AEGetParamDesc('errn', '****')
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except AE.Error:
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pass
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else:
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parameters['errn'] = unpack(dirobj, formodulename)
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del dirobj
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while 1:
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key = missed(ae)
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if not key: break
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parameters[key] = unpack(ae.AEGetParamDesc(key, '****'), formodulename)
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attributes = {}
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for key in aekeywords:
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try:
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desc = ae.AEGetAttributeDesc(key, '****')
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except (AE.Error, MacOS.Error), msg:
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if msg[0] != -1701 and msg[0] != -1704:
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raise
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continue
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attributes[key] = unpack(desc, formodulename)
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return parameters, attributes
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def packevent(ae, parameters = {}, attributes = {}):
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for key, value in parameters.items():
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packkey(ae, key, value)
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for key, value in attributes.items():
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ae.AEPutAttributeDesc(key, pack(value))
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#
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# Support routine for automatically generated Suite interfaces
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# These routines are also useable for the reverse function.
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#
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def keysubst(arguments, keydict):
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"""Replace long name keys by their 4-char counterparts, and check"""
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ok = keydict.values()
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for k in arguments.keys():
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if keydict.has_key(k):
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v = arguments[k]
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del arguments[k]
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arguments[keydict[k]] = v
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elif k != '----' and k not in ok:
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raise TypeError, 'Unknown keyword argument: %s'%k
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def enumsubst(arguments, key, edict):
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"""Substitute a single enum keyword argument, if it occurs"""
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if not arguments.has_key(key) or edict is None:
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return
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v = arguments[key]
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ok = edict.values()
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if edict.has_key(v):
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arguments[key] = Enum(edict[v])
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elif not v in ok:
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raise TypeError, 'Unknown enumerator: %s'%v
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def decodeerror(arguments):
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"""Create the 'best' argument for a raise MacOS.Error"""
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errn = arguments['errn']
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err_a1 = errn
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if arguments.has_key('errs'):
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err_a2 = arguments['errs']
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else:
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err_a2 = MacOS.GetErrorString(errn)
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if arguments.has_key('erob'):
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err_a3 = arguments['erob']
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else:
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err_a3 = None
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return (err_a1, err_a2, err_a3)
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class TalkTo:
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"""An AE connection to an application"""
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_signature = None # Can be overridden by subclasses
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_moduleName = None # Can be overridden by subclasses
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_elemdict = {} # Can be overridden by subclasses
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_propdict = {} # Can be overridden by subclasses
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__eventloop_initialized = 0
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def __ensure_WMAvailable(klass):
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if klass.__eventloop_initialized: return 1
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if not MacOS.WMAvailable(): return 0
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# Workaround for a but in MacOSX 10.2: we must have an event
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# loop before we can call AESend.
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Evt.WaitNextEvent(0,0)
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return 1
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__ensure_WMAvailable = classmethod(__ensure_WMAvailable)
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def __init__(self, signature=None, start=0, timeout=0):
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"""Create a communication channel with a particular application.
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Addressing the application is done by specifying either a
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4-byte signature, an AEDesc or an object that will __aepack__
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to an AEDesc.
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"""
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self.target_signature = None
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if signature is None:
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signature = self._signature
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if type(signature) == AEDescType:
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self.target = signature
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elif type(signature) == InstanceType and hasattr(signature, '__aepack__'):
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self.target = signature.__aepack__()
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elif type(signature) == StringType and len(signature) == 4:
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self.target = AE.AECreateDesc(AppleEvents.typeApplSignature, signature)
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self.target_signature = signature
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else:
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raise TypeError, "signature should be 4-char string or AEDesc"
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self.send_flags = AppleEvents.kAEWaitReply
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self.send_priority = AppleEvents.kAENormalPriority
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if timeout:
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self.send_timeout = timeout
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else:
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self.send_timeout = AppleEvents.kAEDefaultTimeout
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if start:
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self._start()
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def _start(self):
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"""Start the application, if it is not running yet"""
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try:
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self.send('ascr', 'noop')
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except AE.Error:
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_launch(self.target_signature)
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for i in range(LAUNCH_MAX_WAIT_TIME):
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try:
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self.send('ascr', 'noop')
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except AE.Error:
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pass
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else:
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break
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time.sleep(1)
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def start(self):
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"""Deprecated, used _start()"""
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self._start()
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def newevent(self, code, subcode, parameters = {}, attributes = {}):
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"""Create a complete structure for an apple event"""
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event = AE.AECreateAppleEvent(code, subcode, self.target,
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AppleEvents.kAutoGenerateReturnID, AppleEvents.kAnyTransactionID)
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packevent(event, parameters, attributes)
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return event
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def sendevent(self, event):
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"""Send a pre-created appleevent, await the reply and unpack it"""
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if not self.__ensure_WMAvailable():
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raise RuntimeError, "No window manager access, cannot send AppleEvent"
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reply = event.AESend(self.send_flags, self.send_priority,
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self.send_timeout)
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parameters, attributes = unpackevent(reply, self._moduleName)
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return reply, parameters, attributes
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def send(self, code, subcode, parameters = {}, attributes = {}):
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"""Send an appleevent given code/subcode/pars/attrs and unpack the reply"""
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return self.sendevent(self.newevent(code, subcode, parameters, attributes))
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#
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# The following events are somehow "standard" and don't seem to appear in any
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# suite...
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#
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def activate(self):
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"""Send 'activate' command"""
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self.send('misc', 'actv')
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def _get(self, _object, as=None, _attributes={}):
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"""_get: get data from an object
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Required argument: the object
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Keyword argument _attributes: AppleEvent attribute dictionary
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Returns: the data
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"""
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_code = 'core'
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_subcode = 'getd'
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_arguments = {'----':_object}
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if as:
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_arguments['rtyp'] = mktype(as)
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_reply, _arguments, _attributes = self.send(_code, _subcode,
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_arguments, _attributes)
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if _arguments.has_key('errn'):
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raise Error, decodeerror(_arguments)
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if _arguments.has_key('----'):
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return _arguments['----']
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if as:
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item.__class__ = as
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return item
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get = _get
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_argmap_set = {
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'to' : 'data',
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}
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def _set(self, _object, _attributes={}, **_arguments):
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"""set: Set an object's data.
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Required argument: the object for the command
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Keyword argument to: The new value.
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Keyword argument _attributes: AppleEvent attribute dictionary
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"""
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_code = 'core'
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_subcode = 'setd'
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keysubst(_arguments, self._argmap_set)
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_arguments['----'] = _object
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_reply, _arguments, _attributes = self.send(_code, _subcode,
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_arguments, _attributes)
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if _arguments.get('errn', 0):
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raise Error, decodeerror(_arguments)
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# XXXX Optionally decode result
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if _arguments.has_key('----'):
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return _arguments['----']
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set = _set
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# Magic glue to allow suite-generated classes to function somewhat
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# like the "application" class in OSA.
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def __getattr__(self, name):
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if self._elemdict.has_key(name):
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cls = self._elemdict[name]
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return DelayedComponentItem(cls, None)
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if self._propdict.has_key(name):
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cls = self._propdict[name]
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return cls()
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raise AttributeError, name
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# Tiny Finder class, for local use only
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class _miniFinder(TalkTo):
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def open(self, _object, _attributes={}, **_arguments):
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"""open: Open the specified object(s)
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Required argument: list of objects to open
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Keyword argument _attributes: AppleEvent attribute dictionary
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"""
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_code = 'aevt'
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_subcode = 'odoc'
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if _arguments: raise TypeError, 'No optional args expected'
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_arguments['----'] = _object
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_reply, _arguments, _attributes = self.send(_code, _subcode,
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_arguments, _attributes)
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if _arguments.has_key('errn'):
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raise Error, decodeerror(_arguments)
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# XXXX Optionally decode result
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if _arguments.has_key('----'):
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return _arguments['----']
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#pass
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_finder = _miniFinder('MACS')
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def _launch(appfile):
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"""Open a file thru the finder. Specify file by name or fsspec"""
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_finder.open(_application_file(('ID ', appfile)))
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class _application_file(ComponentItem):
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"""application file - An application's file on disk"""
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want = 'appf'
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_application_file._propdict = {
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}
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_application_file._elemdict = {
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}
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# Test program
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# XXXX Should test more, really...
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def test():
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target = AE.AECreateDesc('sign', 'quil')
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ae = AE.AECreateAppleEvent('aevt', 'oapp', target, -1, 0)
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print unpackevent(ae)
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raw_input(":")
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ae = AE.AECreateAppleEvent('core', 'getd', target, -1, 0)
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obj = Character(2, Word(1, Document(1)))
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print obj
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print repr(obj)
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packevent(ae, {'----': obj})
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params, attrs = unpackevent(ae)
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print params['----']
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raw_input(":")
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if __name__ == '__main__':
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test()
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sys.exit(1)
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