summaryrefslogtreecommitdiffstats
path: root/Lib/plat-mac/aepack.py
blob: 22dfd21dd1167c0711b9a4ace4cc33d915af55f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
"""Tools for use in AppleEvent clients and servers:
conversion between AE types and python types

pack(x) converts a Python object to an AEDesc object
unpack(desc) does the reverse
coerce(x, wanted_sample) coerces a python object to another python object
"""

#
# This code was originally written by Guido, and modified/extended by Jack
# to include the various types that were missing. The reference used is
# Apple Event Registry, chapter 9.
#

import struct
import string
import types
from string import strip
from types import *
from Carbon import AE
from Carbon.AppleEvents import *
import MacOS
import Carbon.File
import StringIO
import aetypes
from aetypes import mkenum, ObjectSpecifier
import os

# These ones seem to be missing from AppleEvents
# (they're in AERegistry.h)

#typeColorTable = 'clrt'
#typeDrawingArea = 'cdrw'
#typePixelMap = 'cpix'
#typePixelMapMinus = 'tpmm'
#typeRotation = 'trot'
#typeTextStyles = 'tsty'
#typeStyledText = 'STXT'
#typeAEText = 'tTXT'
#typeEnumeration = 'enum'

#
# Some AE types are immedeately coerced into something
# we like better (and which is equivalent)
#
unpacker_coercions = {
    typeComp : typeFloat,
    typeColorTable : typeAEList,
    typeDrawingArea : typeAERecord,
    typeFixed : typeFloat,
    typeExtended : typeFloat,
    typePixelMap : typeAERecord,
    typeRotation : typeAERecord,
    typeStyledText : typeAERecord,
    typeTextStyles : typeAERecord,
};

#
# Some python types we need in the packer:
#
AEDescType = AE.AEDescType
FSSType = Carbon.File.FSSpecType
FSRefType = Carbon.File.FSRefType
AliasType = Carbon.File.AliasType

def packkey(ae, key, value):
    if hasattr(key, 'which'):
        keystr = key.which
    elif hasattr(key, 'want'):
        keystr = key.want
    else:
        keystr = key
    ae.AEPutParamDesc(keystr, pack(value))

def pack(x, forcetype = None):
    """Pack a python object into an AE descriptor"""
    
    if forcetype:
        if type(x) is StringType:
            return AE.AECreateDesc(forcetype, x)
        else:
            return pack(x).AECoerceDesc(forcetype)
            
    if x == None:
        return AE.AECreateDesc('null', '')
        
    if isinstance(x, AEDescType):
        return x
    if isinstance(x, FSSType):
        return AE.AECreateDesc('fss ', x.data)
    if isinstance(x, FSRefType):
        return AE.AECreateDesc('fsrf', x.data)
    if isinstance(x, AliasType):
        return AE.AECreateDesc('alis', x.data)
    if isinstance(x, IntType):
        return AE.AECreateDesc('long', struct.pack('l', x))
    if isinstance(x, FloatType):
        return AE.AECreateDesc('doub', struct.pack('d', x))
    if isinstance(x, StringType):
        return AE.AECreateDesc('TEXT', x)
    if isinstance(x, UnicodeType):
        data = x.encode('utf16')
        if data[:2] == '\xfe\xff':
            data = data[2:]
        return AE.AECreateDesc('utxt', data)
    if isinstance(x, ListType):
        list = AE.AECreateList('', 0)
        for item in x:
            list.AEPutDesc(0, pack(item))
        return list
    if isinstance(x, DictionaryType):
        record = AE.AECreateList('', 1)
        for key, value in x.items():
            packkey(record, key, value)
            #record.AEPutParamDesc(key, pack(value))
        return record
    if type(x) == types.ClassType and issubclass(x, ObjectSpecifier):
        # Note: we are getting a class object here, not an instance
        return AE.AECreateDesc('type', x.want)
    if hasattr(x, '__aepack__'):
        return x.__aepack__()
    if hasattr(x, 'which'):
        return AE.AECreateDesc('TEXT', x.which)
    if hasattr(x, 'want'):
        return AE.AECreateDesc('TEXT', x.want)
    return AE.AECreateDesc('TEXT', repr(x)) # Copout

def unpack(desc, formodulename=""):
    """Unpack an AE descriptor to a python object"""
    t = desc.type
    
    if unpacker_coercions.has_key(t):
        desc = desc.AECoerceDesc(unpacker_coercions[t])
        t = desc.type # This is a guess by Jack....
    
    if t == typeAEList:
        l = []
        for i in range(desc.AECountItems()):
            keyword, item = desc.AEGetNthDesc(i+1, '****')
            l.append(unpack(item, formodulename))
        return l
    if t == typeAERecord:
        d = {}
        for i in range(desc.AECountItems()):
            keyword, item = desc.AEGetNthDesc(i+1, '****')
            d[keyword] = unpack(item, formodulename)
        return d
    if t == typeAEText:
        record = desc.AECoerceDesc('reco')
        return mkaetext(unpack(record, formodulename))
    if t == typeAlias:
        return Carbon.File.Alias(rawdata=desc.data)
    # typeAppleEvent returned as unknown
    if t == typeBoolean:
        return struct.unpack('b', desc.data)[0]
    if t == typeChar:
        return desc.data
    if t == typeUnicodeText:
        return unicode(desc.data, 'utf16')
    # typeColorTable coerced to typeAEList
    # typeComp coerced to extended
    # typeData returned as unknown
    # typeDrawingArea coerced to typeAERecord
    if t == typeEnumeration:
        return mkenum(desc.data)
    # typeEPS returned as unknown
    if t == typeFalse:
        return 0
    if t == typeFloat:
        data = desc.data
        return struct.unpack('d', data)[0]
    if t == typeFSS:
        return Carbon.File.FSSpec(rawdata=desc.data)
    if t == typeFSRef:
        return Carbon.File.FSRef(rawdata=desc.data)
    if t == typeInsertionLoc:
        record = desc.AECoerceDesc('reco')
        return mkinsertionloc(unpack(record, formodulename))
    # typeInteger equal to typeLongInteger
    if t == typeIntlText:
        script, language = struct.unpack('hh', desc.data[:4])
        return aetypes.IntlText(script, language, desc.data[4:])
    if t == typeIntlWritingCode:
        script, language = struct.unpack('hh', desc.data)
        return aetypes.IntlWritingCode(script, language)
    if t == typeKeyword:
        return mkkeyword(desc.data)
    if t == typeLongInteger:
        return struct.unpack('l', desc.data)[0]
    if t == typeLongDateTime:
        a, b = struct.unpack('lL', desc.data)
        return (long(a) << 32) + b
    if t == typeNull:
        return None
    if t == typeMagnitude:
        v = struct.unpack('l', desc.data)
        if v < 0:
            v = 0x100000000L + v
        return v
    if t == typeObjectSpecifier:
        record = desc.AECoerceDesc('reco')
        # If we have been told the name of the module we are unpacking aedescs for,
        # we can attempt to create the right type of python object from that module.
        if formodulename:
            return mkobjectfrommodule(unpack(record, formodulename), formodulename)
        return mkobject(unpack(record, formodulename))
    # typePict returned as unknown
    # typePixelMap coerced to typeAERecord
    # typePixelMapMinus returned as unknown
    # typeProcessSerialNumber returned as unknown
    if t == typeQDPoint:
        v, h = struct.unpack('hh', desc.data)
        return aetypes.QDPoint(v, h)
    if t == typeQDRectangle:
        v0, h0, v1, h1 = struct.unpack('hhhh', desc.data)
        return aetypes.QDRectangle(v0, h0, v1, h1)
    if t == typeRGBColor:
        r, g, b = struct.unpack('hhh', desc.data)
        return aetypes.RGBColor(r, g, b)
    # typeRotation coerced to typeAERecord
    # typeScrapStyles returned as unknown
    # typeSessionID returned as unknown
    if t == typeShortFloat:
        return struct.unpack('f', desc.data)[0]
    if t == typeShortInteger:
        return struct.unpack('h', desc.data)[0]
    # typeSMFloat identical to typeShortFloat
    # typeSMInt indetical to typeShortInt
    # typeStyledText coerced to typeAERecord
    if t == typeTargetID:
        return mktargetid(desc.data)
    # typeTextStyles coerced to typeAERecord
    # typeTIFF returned as unknown
    if t == typeTrue:
        return 1
    if t == typeType:
        return mktype(desc.data, formodulename)
    #
    # The following are special
    #
    if t == 'rang':
        record = desc.AECoerceDesc('reco')
        return mkrange(unpack(record, formodulename))
    if t == 'cmpd':
        record = desc.AECoerceDesc('reco')
        return mkcomparison(unpack(record, formodulename))
    if t == 'logi':
        record = desc.AECoerceDesc('reco')
        return mklogical(unpack(record, formodulename))
    return mkunknown(desc.type, desc.data)
    
def coerce(data, egdata):
    """Coerce a python object to another type using the AE coercers"""
    pdata = pack(data)
    pegdata = pack(egdata)
    pdata = pdata.AECoerceDesc(pegdata.type)
    return unpack(pdata)

#
# Helper routines for unpack
#
def mktargetid(data):
    sessionID = getlong(data[:4])
    name = mkppcportrec(data[4:4+72])
    location = mklocationnamerec(data[76:76+36])
    rcvrName = mkppcportrec(data[112:112+72])
    return sessionID, name, location, rcvrName

def mkppcportrec(rec):
    namescript = getword(rec[:2])
    name = getpstr(rec[2:2+33])
    portkind = getword(rec[36:38])
    if portkind == 1:
        ctor = rec[38:42]
        type = rec[42:46]
        identity = (ctor, type)
    else:
        identity = getpstr(rec[38:38+33])
    return namescript, name, portkind, identity

def mklocationnamerec(rec):
    kind = getword(rec[:2])
    stuff = rec[2:]
    if kind == 0: stuff = None
    if kind == 2: stuff = getpstr(stuff)
    return kind, stuff

def mkunknown(type, data):
    return aetypes.Unknown(type, data)

def getpstr(s):
    return s[1:1+ord(s[0])]

def getlong(s):
    return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3])

def getword(s):
    return (ord(s[0])<<8) | (ord(s[1])<<0)

def mkkeyword(keyword):
    return aetypes.Keyword(keyword)

def mkrange(dict):
    return aetypes.Range(dict['star'], dict['stop'])

def mkcomparison(dict):
    return aetypes.Comparison(dict['obj1'], dict['relo'].enum, dict['obj2'])

def mklogical(dict):
    return aetypes.Logical(dict['logc'], dict['term'])

def mkstyledtext(dict):
    return aetypes.StyledText(dict['ksty'], dict['ktxt'])
    
def mkaetext(dict):
    return aetypes.AEText(dict[keyAEScriptTag], dict[keyAEStyles], dict[keyAEText])
    
def mkinsertionloc(dict):
    return aetypes.InsertionLoc(dict[keyAEObject], dict[keyAEPosition])

def mkobject(dict):
    want = dict['want'].type
    form = dict['form'].enum
    seld = dict['seld']
    fr   = dict['from']
    if form in ('name', 'indx', 'rang', 'test'):
        if want == 'text': return aetypes.Text(seld, fr)
        if want == 'cha ': return aetypes.Character(seld, fr)
        if want == 'cwor': return aetypes.Word(seld, fr)
        if want == 'clin': return aetypes.Line(seld, fr)
        if want == 'cpar': return aetypes.Paragraph(seld, fr)
        if want == 'cwin': return aetypes.Window(seld, fr)
        if want == 'docu': return aetypes.Document(seld, fr)
        if want == 'file': return aetypes.File(seld, fr)
        if want == 'cins': return aetypes.InsertionPoint(seld, fr)
    if want == 'prop' and form == 'prop' and aetypes.IsType(seld):
        return aetypes.Property(seld.type, fr)
    return aetypes.ObjectSpecifier(want, form, seld, fr)

# Note by Jack: I'm not 100% sure of the following code. This was
# provided by Donovan Preston, but I wonder whether the assignment
# to __class__ is safe. Moreover, shouldn't there be a better
# initializer for the classes in the suites?
def mkobjectfrommodule(dict, modulename):
    if type(dict['want']) == types.ClassType and issubclass(dict['want'], ObjectSpecifier):
        # The type has already been converted to Python. Convert back:-(
        classtype = dict['want']
        dict['want'] = aetypes.mktype(classtype.want)
    want = dict['want'].type
    module = __import__(modulename)
    codenamemapper = module._classdeclarations
    classtype = codenamemapper.get(want, None)
    newobj = mkobject(dict)
    if classtype:
        assert issubclass(classtype, ObjectSpecifier)
        newobj.__class__ = classtype
    return newobj
    
def mktype(typecode, modulename=None):
    if modulename:
        module = __import__(modulename)
        codenamemapper = module._classdeclarations
        classtype = codenamemapper.get(typecode, None)
        if classtype:
            return classtype
    return aetypes.mktype(typecode)