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/Lib/plat-mac/aepack.py

http://unladen-swallow.googlecode.com/
Python | 369 lines | 322 code | 12 blank | 35 comment | 10 complexity | dad571a31556474e1c8b58b161f338ea MD5 | raw file
  1"""Tools for use in AppleEvent clients and servers:
  2conversion between AE types and python types
  3
  4pack(x) converts a Python object to an AEDesc object
  5unpack(desc) does the reverse
  6coerce(x, wanted_sample) coerces a python object to another python object
  7"""
  8
  9#
 10# This code was originally written by Guido, and modified/extended by Jack
 11# to include the various types that were missing. The reference used is
 12# Apple Event Registry, chapter 9.
 13#
 14
 15from warnings import warnpy3k
 16warnpy3k("In 3.x, the aepack module is removed.", stacklevel=2)
 17
 18import struct
 19import types
 20from types import *
 21from Carbon import AE
 22from Carbon.AppleEvents import *
 23import MacOS
 24import Carbon.File
 25import aetypes
 26from aetypes import mkenum, ObjectSpecifier
 27
 28# These ones seem to be missing from AppleEvents
 29# (they're in AERegistry.h)
 30
 31#typeColorTable = 'clrt'
 32#typeDrawingArea = 'cdrw'
 33#typePixelMap = 'cpix'
 34#typePixelMapMinus = 'tpmm'
 35#typeRotation = 'trot'
 36#typeTextStyles = 'tsty'
 37#typeStyledText = 'STXT'
 38#typeAEText = 'tTXT'
 39#typeEnumeration = 'enum'
 40
 41#
 42# Some AE types are immedeately coerced into something
 43# we like better (and which is equivalent)
 44#
 45unpacker_coercions = {
 46    typeComp : typeFloat,
 47    typeColorTable : typeAEList,
 48    typeDrawingArea : typeAERecord,
 49    typeFixed : typeFloat,
 50    typeExtended : typeFloat,
 51    typePixelMap : typeAERecord,
 52    typeRotation : typeAERecord,
 53    typeStyledText : typeAERecord,
 54    typeTextStyles : typeAERecord,
 55};
 56
 57#
 58# Some python types we need in the packer:
 59#
 60AEDescType = AE.AEDescType
 61try:
 62    FSSType = Carbon.File.FSSpecType
 63except AttributeError:
 64    class FSSType:
 65        pass
 66FSRefType = Carbon.File.FSRefType
 67AliasType = Carbon.File.AliasType
 68
 69def packkey(ae, key, value):
 70    if hasattr(key, 'which'):
 71        keystr = key.which
 72    elif hasattr(key, 'want'):
 73        keystr = key.want
 74    else:
 75        keystr = key
 76    ae.AEPutParamDesc(keystr, pack(value))
 77
 78def pack(x, forcetype = None):
 79    """Pack a python object into an AE descriptor"""
 80
 81    if forcetype:
 82        if type(x) is StringType:
 83            return AE.AECreateDesc(forcetype, x)
 84        else:
 85            return pack(x).AECoerceDesc(forcetype)
 86
 87    if x is None:
 88        return AE.AECreateDesc('null', '')
 89
 90    if isinstance(x, AEDescType):
 91        return x
 92    if isinstance(x, FSSType):
 93        return AE.AECreateDesc('fss ', x.data)
 94    if isinstance(x, FSRefType):
 95        return AE.AECreateDesc('fsrf', x.data)
 96    if isinstance(x, AliasType):
 97        return AE.AECreateDesc('alis', x.data)
 98    if isinstance(x, IntType):
 99        return AE.AECreateDesc('long', struct.pack('l', x))
100    if isinstance(x, FloatType):
101        return AE.AECreateDesc('doub', struct.pack('d', x))
102    if isinstance(x, StringType):
103        return AE.AECreateDesc('TEXT', x)
104    if isinstance(x, UnicodeType):
105        data = x.encode('utf16')
106        if data[:2] == '\xfe\xff':
107            data = data[2:]
108        return AE.AECreateDesc('utxt', data)
109    if isinstance(x, ListType):
110        list = AE.AECreateList('', 0)
111        for item in x:
112            list.AEPutDesc(0, pack(item))
113        return list
114    if isinstance(x, DictionaryType):
115        record = AE.AECreateList('', 1)
116        for key, value in x.items():
117            packkey(record, key, value)
118            #record.AEPutParamDesc(key, pack(value))
119        return record
120    if type(x) == types.ClassType and issubclass(x, ObjectSpecifier):
121        # Note: we are getting a class object here, not an instance
122        return AE.AECreateDesc('type', x.want)
123    if hasattr(x, '__aepack__'):
124        return x.__aepack__()
125    if hasattr(x, 'which'):
126        return AE.AECreateDesc('TEXT', x.which)
127    if hasattr(x, 'want'):
128        return AE.AECreateDesc('TEXT', x.want)
129    return AE.AECreateDesc('TEXT', repr(x)) # Copout
130
131def unpack(desc, formodulename=""):
132    """Unpack an AE descriptor to a python object"""
133    t = desc.type
134
135    if unpacker_coercions.has_key(t):
136        desc = desc.AECoerceDesc(unpacker_coercions[t])
137        t = desc.type # This is a guess by Jack....
138
139    if t == typeAEList:
140        l = []
141        for i in range(desc.AECountItems()):
142            keyword, item = desc.AEGetNthDesc(i+1, '****')
143            l.append(unpack(item, formodulename))
144        return l
145    if t == typeAERecord:
146        d = {}
147        for i in range(desc.AECountItems()):
148            keyword, item = desc.AEGetNthDesc(i+1, '****')
149            d[keyword] = unpack(item, formodulename)
150        return d
151    if t == typeAEText:
152        record = desc.AECoerceDesc('reco')
153        return mkaetext(unpack(record, formodulename))
154    if t == typeAlias:
155        return Carbon.File.Alias(rawdata=desc.data)
156    # typeAppleEvent returned as unknown
157    if t == typeBoolean:
158        return struct.unpack('b', desc.data)[0]
159    if t == typeChar:
160        return desc.data
161    if t == typeUnicodeText:
162        return unicode(desc.data, 'utf16')
163    # typeColorTable coerced to typeAEList
164    # typeComp coerced to extended
165    # typeData returned as unknown
166    # typeDrawingArea coerced to typeAERecord
167    if t == typeEnumeration:
168        return mkenum(desc.data)
169    # typeEPS returned as unknown
170    if t == typeFalse:
171        return 0
172    if t == typeFloat:
173        data = desc.data
174        return struct.unpack('d', data)[0]
175    if t == typeFSS:
176        return Carbon.File.FSSpec(rawdata=desc.data)
177    if t == typeFSRef:
178        return Carbon.File.FSRef(rawdata=desc.data)
179    if t == typeInsertionLoc:
180        record = desc.AECoerceDesc('reco')
181        return mkinsertionloc(unpack(record, formodulename))
182    # typeInteger equal to typeLongInteger
183    if t == typeIntlText:
184        script, language = struct.unpack('hh', desc.data[:4])
185        return aetypes.IntlText(script, language, desc.data[4:])
186    if t == typeIntlWritingCode:
187        script, language = struct.unpack('hh', desc.data)
188        return aetypes.IntlWritingCode(script, language)
189    if t == typeKeyword:
190        return mkkeyword(desc.data)
191    if t == typeLongInteger:
192        return struct.unpack('l', desc.data)[0]
193    if t == typeLongDateTime:
194        a, b = struct.unpack('lL', desc.data)
195        return (long(a) << 32) + b
196    if t == typeNull:
197        return None
198    if t == typeMagnitude:
199        v = struct.unpack('l', desc.data)
200        if v < 0:
201            v = 0x100000000L + v
202        return v
203    if t == typeObjectSpecifier:
204        record = desc.AECoerceDesc('reco')
205        # If we have been told the name of the module we are unpacking aedescs for,
206        # we can attempt to create the right type of python object from that module.
207        if formodulename:
208            return mkobjectfrommodule(unpack(record, formodulename), formodulename)
209        return mkobject(unpack(record, formodulename))
210    # typePict returned as unknown
211    # typePixelMap coerced to typeAERecord
212    # typePixelMapMinus returned as unknown
213    # typeProcessSerialNumber returned as unknown
214    if t == typeQDPoint:
215        v, h = struct.unpack('hh', desc.data)
216        return aetypes.QDPoint(v, h)
217    if t == typeQDRectangle:
218        v0, h0, v1, h1 = struct.unpack('hhhh', desc.data)
219        return aetypes.QDRectangle(v0, h0, v1, h1)
220    if t == typeRGBColor:
221        r, g, b = struct.unpack('hhh', desc.data)
222        return aetypes.RGBColor(r, g, b)
223    # typeRotation coerced to typeAERecord
224    # typeScrapStyles returned as unknown
225    # typeSessionID returned as unknown
226    if t == typeShortFloat:
227        return struct.unpack('f', desc.data)[0]
228    if t == typeShortInteger:
229        return struct.unpack('h', desc.data)[0]
230    # typeSMFloat identical to typeShortFloat
231    # typeSMInt indetical to typeShortInt
232    # typeStyledText coerced to typeAERecord
233    if t == typeTargetID:
234        return mktargetid(desc.data)
235    # typeTextStyles coerced to typeAERecord
236    # typeTIFF returned as unknown
237    if t == typeTrue:
238        return 1
239    if t == typeType:
240        return mktype(desc.data, formodulename)
241    #
242    # The following are special
243    #
244    if t == 'rang':
245        record = desc.AECoerceDesc('reco')
246        return mkrange(unpack(record, formodulename))
247    if t == 'cmpd':
248        record = desc.AECoerceDesc('reco')
249        return mkcomparison(unpack(record, formodulename))
250    if t == 'logi':
251        record = desc.AECoerceDesc('reco')
252        return mklogical(unpack(record, formodulename))
253    return mkunknown(desc.type, desc.data)
254
255def coerce(data, egdata):
256    """Coerce a python object to another type using the AE coercers"""
257    pdata = pack(data)
258    pegdata = pack(egdata)
259    pdata = pdata.AECoerceDesc(pegdata.type)
260    return unpack(pdata)
261
262#
263# Helper routines for unpack
264#
265def mktargetid(data):
266    sessionID = getlong(data[:4])
267    name = mkppcportrec(data[4:4+72])
268    location = mklocationnamerec(data[76:76+36])
269    rcvrName = mkppcportrec(data[112:112+72])
270    return sessionID, name, location, rcvrName
271
272def mkppcportrec(rec):
273    namescript = getword(rec[:2])
274    name = getpstr(rec[2:2+33])
275    portkind = getword(rec[36:38])
276    if portkind == 1:
277        ctor = rec[38:42]
278        type = rec[42:46]
279        identity = (ctor, type)
280    else:
281        identity = getpstr(rec[38:38+33])
282    return namescript, name, portkind, identity
283
284def mklocationnamerec(rec):
285    kind = getword(rec[:2])
286    stuff = rec[2:]
287    if kind == 0: stuff = None
288    if kind == 2: stuff = getpstr(stuff)
289    return kind, stuff
290
291def mkunknown(type, data):
292    return aetypes.Unknown(type, data)
293
294def getpstr(s):
295    return s[1:1+ord(s[0])]
296
297def getlong(s):
298    return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3])
299
300def getword(s):
301    return (ord(s[0])<<8) | (ord(s[1])<<0)
302
303def mkkeyword(keyword):
304    return aetypes.Keyword(keyword)
305
306def mkrange(dict):
307    return aetypes.Range(dict['star'], dict['stop'])
308
309def mkcomparison(dict):
310    return aetypes.Comparison(dict['obj1'], dict['relo'].enum, dict['obj2'])
311
312def mklogical(dict):
313    return aetypes.Logical(dict['logc'], dict['term'])
314
315def mkstyledtext(dict):
316    return aetypes.StyledText(dict['ksty'], dict['ktxt'])
317
318def mkaetext(dict):
319    return aetypes.AEText(dict[keyAEScriptTag], dict[keyAEStyles], dict[keyAEText])
320
321def mkinsertionloc(dict):
322    return aetypes.InsertionLoc(dict[keyAEObject], dict[keyAEPosition])
323
324def mkobject(dict):
325    want = dict['want'].type
326    form = dict['form'].enum
327    seld = dict['seld']
328    fr   = dict['from']
329    if form in ('name', 'indx', 'rang', 'test'):
330        if want == 'text': return aetypes.Text(seld, fr)
331        if want == 'cha ': return aetypes.Character(seld, fr)
332        if want == 'cwor': return aetypes.Word(seld, fr)
333        if want == 'clin': return aetypes.Line(seld, fr)
334        if want == 'cpar': return aetypes.Paragraph(seld, fr)
335        if want == 'cwin': return aetypes.Window(seld, fr)
336        if want == 'docu': return aetypes.Document(seld, fr)
337        if want == 'file': return aetypes.File(seld, fr)
338        if want == 'cins': return aetypes.InsertionPoint(seld, fr)
339    if want == 'prop' and form == 'prop' and aetypes.IsType(seld):
340        return aetypes.Property(seld.type, fr)
341    return aetypes.ObjectSpecifier(want, form, seld, fr)
342
343# Note by Jack: I'm not 100% sure of the following code. This was
344# provided by Donovan Preston, but I wonder whether the assignment
345# to __class__ is safe. Moreover, shouldn't there be a better
346# initializer for the classes in the suites?
347def mkobjectfrommodule(dict, modulename):
348    if type(dict['want']) == types.ClassType and issubclass(dict['want'], ObjectSpecifier):
349        # The type has already been converted to Python. Convert back:-(
350        classtype = dict['want']
351        dict['want'] = aetypes.mktype(classtype.want)
352    want = dict['want'].type
353    module = __import__(modulename)
354    codenamemapper = module._classdeclarations
355    classtype = codenamemapper.get(want, None)
356    newobj = mkobject(dict)
357    if classtype:
358        assert issubclass(classtype, ObjectSpecifier)
359        newobj.__class__ = classtype
360    return newobj
361
362def mktype(typecode, modulename=None):
363    if modulename:
364        module = __import__(modulename)
365        codenamemapper = module._classdeclarations
366        classtype = codenamemapper.get(typecode, None)
367        if classtype:
368            return classtype
369    return aetypes.mktype(typecode)