"""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 *
import AE
from AppleEvents import *
import MacOS
import macfs
import StringIO
import aetypes
from aetypes import mkenum,mktype
# 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 = type(AE.AECreateDesc('TEXT', ''))
_sample_fss = macfs.FSSpec(':')
_sample_alias = _sample_fss.NewAliasMinimal()
FSSType = type(_sample_fss)
AliasType = type(_sample_alias)
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', '')
t = type(x)
if t == AEDescType:
return x
if t == FSSType:
return AE.AECreateDesc('fss ', x.data)
if t == AliasType:
return AE.AECreateDesc('alis', x.data)
if t == IntType:
return AE.AECreateDesc('long', struct.pack('l', x))
if t == FloatType:
return AE.AECreateDesc('doub', struct.pack('d', x))
if t == StringType:
return AE.AECreateDesc('TEXT', x)
if t == ListType:
list = AE.AECreateList('', 0)
for item in x:
list.AEPutDesc(0, pack(item))
return list
if t == DictionaryType:
record = AE.AECreateList('', 1)
for key, value in x.items():
record.AEPutParamDesc(key, pack(value))
return record
if t == InstanceType and hasattr(x, '__aepack__'):
return x.__aepack__()
return AE.AECreateDesc('TEXT', repr(x)) # Copout
def unpack(desc):
"""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))
return l
if t == typeAERecord:
d = {}
for i in range(desc.AECountItems()):
keyword, item = desc.AEGetNthDesc(i+1, '****')
d[keyword] = unpack(item)
return d
if t == typeAEText:
record = desc.AECoerceDesc('reco')
return mkaetext(unpack(record))
if t == typeAlias:
return macfs.RawAlias(desc.data)
# typeAppleEvent returned as unknown
if t == typeBoolean:
return struct.unpack('b', desc.data)[0]
if t == typeChar:
return desc.data
# 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 macfs.RawFSSpec(desc.data)
if t == typeInsertionLoc:
record = desc.AECoerceDesc('reco')
return mkinsertionloc(unpack(record))
# 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')
return mkobject(unpack(record))
# 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)
#
# The following are special
#
if t == 'rang':
record = desc.AECoerceDesc('reco')
return mkrange(unpack(record))
if t == 'cmpd':
record = desc.AECoerceDesc('reco')
return mkcomparison(unpack(record))
if t == 'logi':
record = desc.AECoerceDesc('reco')
return mklogical(unpack(record))
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)
def _test():
"""Test program. Pack and unpack various things"""
objs = [
'a string',
12,
12.0,
None,
['a', 'list', 'of', 'strings'],
{'key1': 'value1', 'key2':'value2'},
macfs.FSSpec(':'),
macfs.FSSpec(':').NewAliasMinimal(),
aetypes.Enum('enum'),
aetypes.Type('type'),
aetypes.Keyword('kwrd'),
aetypes.Range(1, 10),
aetypes.Comparison(1, '< ', 10),
aetypes.Logical('not ', 1),
# Cannot do StyledText
# Cannot do AEText
aetypes.IntlText(0, 0, 'international text'),
aetypes.IntlWritingCode(0,0),
aetypes.QDPoint(50,100),
aetypes.QDRectangle(50,100,150,200),
aetypes.RGBColor(0x7000, 0x6000, 0x5000),
aetypes.Unknown('xxxx', 'unknown type data'),
aetypes.Character(1),
aetypes.Character(2, aetypes.Line(2)),
]
for o in objs:
print 'BEFORE', o, `o`
packed = pack(o)
unpacked = unpack(packed)
print 'AFTER ', unpacked, `unpacked`
import sys
sys.exit(1)
if __name__ == '__main__':
_test()
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