363 lines
12 KiB
Python
363 lines
12 KiB
Python
"""Tools for use in AppleEvent clients and servers:
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conversion between AE types and python types
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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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coerce(x, wanted_sample) coerces a python object to another python object
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"""
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#
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# This code was originally written by Guido, and modified/extended by Jack
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# to include the various types that were missing. The reference used is
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# Apple Event Registry, chapter 9.
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#
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import struct
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import types
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from types import *
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from Carbon import AE
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from Carbon.AppleEvents import *
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import MacOS
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import Carbon.File
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import aetypes
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from aetypes import mkenum, ObjectSpecifier
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# These ones seem to be missing from AppleEvents
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# (they're in AERegistry.h)
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#typeColorTable = 'clrt'
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#typeDrawingArea = 'cdrw'
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#typePixelMap = 'cpix'
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#typePixelMapMinus = 'tpmm'
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#typeRotation = 'trot'
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#typeTextStyles = 'tsty'
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#typeStyledText = 'STXT'
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#typeAEText = 'tTXT'
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#typeEnumeration = 'enum'
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#
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# Some AE types are immedeately coerced into something
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# we like better (and which is equivalent)
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#
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unpacker_coercions = {
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typeComp : typeFloat,
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typeColorTable : typeAEList,
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typeDrawingArea : typeAERecord,
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typeFixed : typeFloat,
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typeExtended : typeFloat,
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typePixelMap : typeAERecord,
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typeRotation : typeAERecord,
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typeStyledText : typeAERecord,
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typeTextStyles : typeAERecord,
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};
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#
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# Some python types we need in the packer:
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#
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AEDescType = AE.AEDescType
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FSSType = Carbon.File.FSSpecType
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FSRefType = Carbon.File.FSRefType
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AliasType = Carbon.File.AliasType
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def packkey(ae, key, value):
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if hasattr(key, 'which'):
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keystr = key.which
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elif hasattr(key, 'want'):
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keystr = key.want
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else:
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keystr = key
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ae.AEPutParamDesc(keystr, pack(value))
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def pack(x, forcetype = None):
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"""Pack a python object into an AE descriptor"""
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if forcetype:
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if type(x) is StringType:
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return AE.AECreateDesc(forcetype, x)
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else:
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return pack(x).AECoerceDesc(forcetype)
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if x == None:
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return AE.AECreateDesc('null', '')
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if isinstance(x, AEDescType):
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return x
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if isinstance(x, FSSType):
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return AE.AECreateDesc('fss ', x.data)
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if isinstance(x, FSRefType):
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return AE.AECreateDesc('fsrf', x.data)
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if isinstance(x, AliasType):
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return AE.AECreateDesc('alis', x.data)
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if isinstance(x, IntType):
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return AE.AECreateDesc('long', struct.pack('l', x))
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if isinstance(x, FloatType):
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return AE.AECreateDesc('doub', struct.pack('d', x))
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if isinstance(x, StringType):
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return AE.AECreateDesc('TEXT', x)
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if isinstance(x, UnicodeType):
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data = x.encode('utf16')
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if data[:2] == '\xfe\xff':
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data = data[2:]
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return AE.AECreateDesc('utxt', data)
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if isinstance(x, ListType):
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list = AE.AECreateList('', 0)
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for item in x:
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list.AEPutDesc(0, pack(item))
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return list
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if isinstance(x, DictionaryType):
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record = AE.AECreateList('', 1)
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for key, value in x.items():
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packkey(record, key, value)
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#record.AEPutParamDesc(key, pack(value))
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return record
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if type(x) == types.ClassType and issubclass(x, ObjectSpecifier):
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# Note: we are getting a class object here, not an instance
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return AE.AECreateDesc('type', x.want)
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if hasattr(x, '__aepack__'):
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return x.__aepack__()
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if hasattr(x, 'which'):
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return AE.AECreateDesc('TEXT', x.which)
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if hasattr(x, 'want'):
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return AE.AECreateDesc('TEXT', x.want)
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return AE.AECreateDesc('TEXT', repr(x)) # Copout
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def unpack(desc, formodulename=""):
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"""Unpack an AE descriptor to a python object"""
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t = desc.type
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if unpacker_coercions.has_key(t):
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desc = desc.AECoerceDesc(unpacker_coercions[t])
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t = desc.type # This is a guess by Jack....
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if t == typeAEList:
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l = []
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for i in range(desc.AECountItems()):
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keyword, item = desc.AEGetNthDesc(i+1, '****')
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l.append(unpack(item, formodulename))
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return l
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if t == typeAERecord:
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d = {}
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for i in range(desc.AECountItems()):
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keyword, item = desc.AEGetNthDesc(i+1, '****')
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d[keyword] = unpack(item, formodulename)
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return d
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if t == typeAEText:
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record = desc.AECoerceDesc('reco')
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return mkaetext(unpack(record, formodulename))
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if t == typeAlias:
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return Carbon.File.Alias(rawdata=desc.data)
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# typeAppleEvent returned as unknown
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if t == typeBoolean:
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return struct.unpack('b', desc.data)[0]
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if t == typeChar:
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return desc.data
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if t == typeUnicodeText:
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return unicode(desc.data, 'utf16')
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# typeColorTable coerced to typeAEList
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# typeComp coerced to extended
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# typeData returned as unknown
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# typeDrawingArea coerced to typeAERecord
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if t == typeEnumeration:
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return mkenum(desc.data)
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# typeEPS returned as unknown
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if t == typeFalse:
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return 0
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if t == typeFloat:
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data = desc.data
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return struct.unpack('d', data)[0]
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if t == typeFSS:
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return Carbon.File.FSSpec(rawdata=desc.data)
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if t == typeFSRef:
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return Carbon.File.FSRef(rawdata=desc.data)
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if t == typeInsertionLoc:
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record = desc.AECoerceDesc('reco')
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return mkinsertionloc(unpack(record, formodulename))
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# typeInteger equal to typeLongInteger
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if t == typeIntlText:
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script, language = struct.unpack('hh', desc.data[:4])
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return aetypes.IntlText(script, language, desc.data[4:])
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if t == typeIntlWritingCode:
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script, language = struct.unpack('hh', desc.data)
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return aetypes.IntlWritingCode(script, language)
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if t == typeKeyword:
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return mkkeyword(desc.data)
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if t == typeLongInteger:
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return struct.unpack('l', desc.data)[0]
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if t == typeLongDateTime:
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a, b = struct.unpack('lL', desc.data)
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return (long(a) << 32) + b
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if t == typeNull:
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return None
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if t == typeMagnitude:
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v = struct.unpack('l', desc.data)
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if v < 0:
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v = 0x100000000L + v
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return v
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if t == typeObjectSpecifier:
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record = desc.AECoerceDesc('reco')
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# If we have been told the name of the module we are unpacking aedescs for,
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# we can attempt to create the right type of python object from that module.
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if formodulename:
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return mkobjectfrommodule(unpack(record, formodulename), formodulename)
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return mkobject(unpack(record, formodulename))
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# typePict returned as unknown
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# typePixelMap coerced to typeAERecord
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# typePixelMapMinus returned as unknown
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# typeProcessSerialNumber returned as unknown
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if t == typeQDPoint:
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v, h = struct.unpack('hh', desc.data)
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return aetypes.QDPoint(v, h)
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if t == typeQDRectangle:
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v0, h0, v1, h1 = struct.unpack('hhhh', desc.data)
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return aetypes.QDRectangle(v0, h0, v1, h1)
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if t == typeRGBColor:
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r, g, b = struct.unpack('hhh', desc.data)
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return aetypes.RGBColor(r, g, b)
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# typeRotation coerced to typeAERecord
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# typeScrapStyles returned as unknown
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# typeSessionID returned as unknown
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if t == typeShortFloat:
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return struct.unpack('f', desc.data)[0]
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if t == typeShortInteger:
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return struct.unpack('h', desc.data)[0]
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# typeSMFloat identical to typeShortFloat
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# typeSMInt indetical to typeShortInt
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# typeStyledText coerced to typeAERecord
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if t == typeTargetID:
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return mktargetid(desc.data)
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# typeTextStyles coerced to typeAERecord
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# typeTIFF returned as unknown
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if t == typeTrue:
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return 1
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if t == typeType:
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return mktype(desc.data, formodulename)
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#
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# The following are special
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#
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if t == 'rang':
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record = desc.AECoerceDesc('reco')
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return mkrange(unpack(record, formodulename))
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if t == 'cmpd':
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record = desc.AECoerceDesc('reco')
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return mkcomparison(unpack(record, formodulename))
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if t == 'logi':
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record = desc.AECoerceDesc('reco')
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return mklogical(unpack(record, formodulename))
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return mkunknown(desc.type, desc.data)
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def coerce(data, egdata):
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"""Coerce a python object to another type using the AE coercers"""
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pdata = pack(data)
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pegdata = pack(egdata)
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pdata = pdata.AECoerceDesc(pegdata.type)
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return unpack(pdata)
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#
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# Helper routines for unpack
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#
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def mktargetid(data):
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sessionID = getlong(data[:4])
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name = mkppcportrec(data[4:4+72])
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location = mklocationnamerec(data[76:76+36])
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rcvrName = mkppcportrec(data[112:112+72])
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return sessionID, name, location, rcvrName
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def mkppcportrec(rec):
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namescript = getword(rec[:2])
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name = getpstr(rec[2:2+33])
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portkind = getword(rec[36:38])
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if portkind == 1:
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ctor = rec[38:42]
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type = rec[42:46]
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identity = (ctor, type)
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else:
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identity = getpstr(rec[38:38+33])
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return namescript, name, portkind, identity
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def mklocationnamerec(rec):
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kind = getword(rec[:2])
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stuff = rec[2:]
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if kind == 0: stuff = None
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if kind == 2: stuff = getpstr(stuff)
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return kind, stuff
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def mkunknown(type, data):
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return aetypes.Unknown(type, data)
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def getpstr(s):
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return s[1:1+ord(s[0])]
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def getlong(s):
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return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3])
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def getword(s):
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return (ord(s[0])<<8) | (ord(s[1])<<0)
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def mkkeyword(keyword):
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return aetypes.Keyword(keyword)
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def mkrange(dict):
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return aetypes.Range(dict['star'], dict['stop'])
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def mkcomparison(dict):
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return aetypes.Comparison(dict['obj1'], dict['relo'].enum, dict['obj2'])
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def mklogical(dict):
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return aetypes.Logical(dict['logc'], dict['term'])
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def mkstyledtext(dict):
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return aetypes.StyledText(dict['ksty'], dict['ktxt'])
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def mkaetext(dict):
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return aetypes.AEText(dict[keyAEScriptTag], dict[keyAEStyles], dict[keyAEText])
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def mkinsertionloc(dict):
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return aetypes.InsertionLoc(dict[keyAEObject], dict[keyAEPosition])
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def mkobject(dict):
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want = dict['want'].type
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form = dict['form'].enum
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seld = dict['seld']
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fr = dict['from']
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if form in ('name', 'indx', 'rang', 'test'):
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if want == 'text': return aetypes.Text(seld, fr)
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if want == 'cha ': return aetypes.Character(seld, fr)
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if want == 'cwor': return aetypes.Word(seld, fr)
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if want == 'clin': return aetypes.Line(seld, fr)
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if want == 'cpar': return aetypes.Paragraph(seld, fr)
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if want == 'cwin': return aetypes.Window(seld, fr)
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if want == 'docu': return aetypes.Document(seld, fr)
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if want == 'file': return aetypes.File(seld, fr)
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if want == 'cins': return aetypes.InsertionPoint(seld, fr)
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if want == 'prop' and form == 'prop' and aetypes.IsType(seld):
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return aetypes.Property(seld.type, fr)
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return aetypes.ObjectSpecifier(want, form, seld, fr)
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# Note by Jack: I'm not 100% sure of the following code. This was
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# provided by Donovan Preston, but I wonder whether the assignment
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# to __class__ is safe. Moreover, shouldn't there be a better
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# initializer for the classes in the suites?
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def mkobjectfrommodule(dict, modulename):
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if type(dict['want']) == types.ClassType and issubclass(dict['want'], ObjectSpecifier):
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# The type has already been converted to Python. Convert back:-(
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classtype = dict['want']
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dict['want'] = aetypes.mktype(classtype.want)
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want = dict['want'].type
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module = __import__(modulename)
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codenamemapper = module._classdeclarations
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classtype = codenamemapper.get(want, None)
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newobj = mkobject(dict)
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if classtype:
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assert issubclass(classtype, ObjectSpecifier)
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newobj.__class__ = classtype
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return newobj
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def mktype(typecode, modulename=None):
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if modulename:
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module = __import__(modulename)
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codenamemapper = module._classdeclarations
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classtype = codenamemapper.get(typecode, None)
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if classtype:
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return classtype
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return aetypes.mktype(typecode)
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