cpython/Mac/Lib/toolbox/aetools.py

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"""Tools for use in AppleEvent clients and servers.
pack(x) converts a Python object to an AEDesc object
unpack(desc) does the reverse
packevent(event, parameters, attributes) sets params and attrs in an AEAppleEvent record
unpackevent(event) returns the parameters and attributes from an AEAppleEvent record
Plus... Lots of classes and routines that help representing AE objects,
ranges, conditionals, logicals, etc., so you can write, e.g.:
x = Character(1, Document("foobar"))
and pack(x) will create an AE object reference equivalent to AppleScript's
character 1 of document "foobar"
"""
import struct
import string
from string import strip
from types import *
import AE
import MacOS
import macfs
import StringIO
AEDescType = type(AE.AECreateDesc('TEXT', ''))
FSSType = type(macfs.FSSpec(':'))
def pack(x, forcetype = None):
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:
vol, dir, filename = x.as_tuple()
fnlen = len(filename)
header = struct.pack('hlb', vol, dir, fnlen)
padding = '\0'*(63-fnlen)
return AE.AECreateDesc('fss ', header + filename + padding)
if t == IntType:
return AE.AECreateDesc('long', struct.pack('l', x))
if t == FloatType:
# XXX Weird thing -- Think C's "double" is 10 bytes, but
# struct.pack('d') return 12 bytes (and struct.unpack requires
# them, too). The first 2 bytes seem to be repeated...
# Probably an alignment problem
return AE.AECreateDesc('exte', struct.pack('d', x)[2:])
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.AEPutKeyDesc(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):
t = desc.type
if t == 'TEXT':
return desc.data
if t == 'fals':
return 0
if t == 'true':
return 1
if t == 'enum':
return mkenum(desc.data)
if t == 'type':
return mktype(desc.data)
if t == 'long':
return struct.unpack('l', desc.data)[0]
if t == 'shor':
return struct.unpack('h', desc.data)[0]
if t == 'sing':
return struct.unpack('f', desc.data)[0]
if t == 'exte':
data = desc.data
# XXX See corresponding note for pack()
return struct.unpack('d', data[:2] + data)[0]
if t in ('doub', 'comp', 'magn'):
return unpack(desc.AECoerceDesc('exte'))
if t == 'null':
return None
if t == 'list':
l = []
for i in range(desc.AECountItems()):
keyword, item = desc.AEGetNthDesc(i+1, '****')
l.append(unpack(item))
return l
if t == 'reco':
d = {}
for i in range(desc.AECountItems()):
keyword, item = desc.AEGetNthDesc(i+1, '****')
d[keyword] = unpack(item)
return d
if t == 'obj ':
record = desc.AECoerceDesc('reco')
return mkobject(unpack(record))
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))
if t == 'targ':
return mktargetid(desc.data)
if t == 'alis':
# XXX Can't handle alias records yet, so coerce to FS spec...
return unpack(desc.AECoerceDesc('fss '))
if t == 'fss ':
return mkfss(desc.data)
return mkunknown(desc.type, desc.data)
def mkfss(data):
vol, dir, fnlen = struct.unpack('hlb', data[:7])
filename = data[7:7+fnlen]
return macfs.FSSpec((vol, dir, filename))
def mktargetid(data):
sessionID = getlong(data[:4])
name = mkppcportrec(data[4:4+72])
print len(name), `name`
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 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 mkunknown(type, data):
return Unknown(type, data)
class Unknown:
def __init__(self, type, data):
self.type = type
self.data = data
def __repr__(self):
return "Unknown(%s, %s)" % (`self.type`, `self.data`)
def __aepack__(self):
return pack(self.data, self.type)
def IsSubclass(cls, base):
"""Test whether CLASS1 is the same as or a subclass of CLASS2"""
# Loop to optimize for single inheritance
while 1:
if cls is base: return 1
if len(cls.__bases__) <> 1: break
cls = cls.__bases__[0]
# Recurse to cope with multiple inheritance
for c in cls.__bases__:
if IsSubclass(c, base): return 1
return 0
def IsInstance(x, cls):
"""Test whether OBJECT is an instance of (a subclass of) CLASS"""
return type(x) is InstanceType and IsSubclass(x.__class__, cls)
def nice(s):
if type(s) is StringType: return repr(s)
else: return str(s)
def mkenum(enum):
if IsEnum(enum): return enum
return Enum(enum)
class Enum:
def __init__(self, enum):
self.enum = "%-4.4s" % str(enum)
def __repr__(self):
return "Enum(%s)" % `self.enum`
def __str__(self):
return strip(self.enum)
def __aepack__(self):
return pack(self.enum, 'enum')
def IsEnum(x):
return IsInstance(x, Enum)
def mktype(type):
if IsType(type): return type
return Type(type)
class Type:
def __init__(self, type):
self.type = "%-4.4s" % str(type)
def __repr__(self):
return "Type(%s)" % `self.type`
def __str__(self):
return strip(self.type)
def __aepack__(self):
return pack(self.type, 'type')
def IsType(x):
return IsInstance(x, Type)
def mkrange(dict):
return Range(dict['star'], dict['stop'])
class Range:
def __init__(self, start, stop):
self.start = start
self.stop = stop
def __repr__(self):
return "Range(%s, %s)" % (`self.start`, `self.stop`)
def __str__(self):
return "%s thru %s" % (nice(self.start), nice(self.stop))
def __aepack__(self):
return pack({'star': self.start, 'stop': self.stop}, 'rang')
def IsRange(x):
return IsInstance(x, Range)
def mkcomparison(dict):
return Comparison(dict['obj1'], dict['relo'].enum, dict['obj2'])
class Comparison:
def __init__(self, obj1, relo, obj2):
self.obj1 = obj1
self.relo = "%-4.4s" % str(relo)
self.obj2 = obj2
def __repr__(self):
return "Comparison(%s, %s, %s)" % (`self.obj1`, `self.relo`, `self.obj2`)
def __str__(self):
return "%s %s %s" % (nice(self.obj1), strip(self.relo), nice(self.obj2))
def __aepack__(self):
return pack({'obj1': self.obj1,
'relo': mkenum(self.relo),
'obj2': self.obj2},
'cmpd')
def IsComparison(x):
return IsInstance(x, Comparison)
def mklogical(dict):
return Logical(dict['logc'], dict['term'])
class Logical:
def __init__(self, logc, term):
self.logc = "%-4.4s" % str(logc)
self.term = term
def __repr__(self):
return "Logical(%s, %s)" % (`self.logc`, `self.term`)
def __str__(self):
if type(self.term) == ListType and len(self.term) == 2:
return "%s %s %s" % (nice(self.term[0]),
strip(self.logc),
nice(self.term[1]))
else:
return "%s(%s)" % (strip(self.logc), nice(self.term))
def __aepack__(self):
return pack({'logc': mkenum(self.logc), 'term': self.term}, 'logi')
def IsLogical(x):
return IsInstance(x, Logical)
class ObjectSpecifier:
"""A class for constructing and manipulation AE object specifiers in python.
An object specifier is actually a record with four fields:
key type description
--- ---- -----------
'want' type what kind of thing we want,
e.g. word, paragraph or property
'form' enum how we specify the thing(s) we want,
e.g. by index, by range, by name, or by property specifier
'seld' any which thing(s) we want,
e.g. its index, its name, or its property specifier
'from' object the object in which it is contained,
or null, meaning look for it in the application
Note that we don't call this class plain "Object", since that name
is likely to be used by the application.
"""
def __init__(self, want, form, seld, fr = None):
self.want = want
self.form = form
self.seld = seld
self.fr = fr
def __repr__(self):
s = "ObjectSpecifier(%s, %s, %s" % (`self.want`, `self.form`, `self.seld`)
if self.fr:
s = s + ", %s)" % `self.fr`
else:
s = s + ")"
return s
def __aepack__(self):
return pack({'want': mktype(self.want),
'form': mkenum(self.form),
'seld': self.seld,
'from': self.fr},
'obj ')
def IsObjectSpecifier(x):
return IsInstance(x, ObjectSpecifier)
class Property(ObjectSpecifier):
def __init__(self, which, fr = None):
ObjectSpecifier.__init__(self, 'prop', 'prop', mkenum(which), fr)
def __repr__(self):
if self.fr:
return "Property(%s, %s)" % (`self.seld.enum`, `self.fr`)
else:
return "Property(%s)" % `self.seld.enum`
def __str__(self):
if self.fr:
return "Property %s of %s" % (str(self.seld), str(self.fr))
else:
return "Property %s" % str(self.seld)
class SelectableItem(ObjectSpecifier):
def __init__(self, want, seld, fr = None):
t = type(seld)
if t == StringType:
form = 'name'
elif IsRange(seld):
form = 'rang'
elif IsComparison(seld) or IsLogical(seld):
form = 'test'
else:
form = 'indx'
ObjectSpecifier.__init__(self, want, form, seld, fr)
class ComponentItem(SelectableItem):
# Derived classes *must* set the *class attribute* 'want' to some constant
def __init__(self, which, fr = None):
SelectableItem.__init__(self, self.want, which, fr)
def __repr__(self):
if not self.fr:
return "%s(%s)" % (self.__class__.__name__, `self.seld`)
return "%s(%s, %s)" % (self.__class__.__name__, `self.seld`, `self.fr`)
def __str__(self):
seld = self.seld
if type(seld) == StringType:
ss = repr(seld)
elif IsRange(seld):
start, stop = seld.start, seld.stop
if type(start) == InstanceType == type(stop) and \
start.__class__ == self.__class__ == stop.__class__:
ss = str(start.seld) + " thru " + str(stop.seld)
else:
ss = str(seld)
else:
ss = str(seld)
s = "%s %s" % (self.__class__.__name__, ss)
if self.fr: s = s + " of %s" % str(self.fr)
return s
template = """
class %s(ComponentItem): want = '%s'
"""
exec template % ("Text", 'text')
exec template % ("Character", 'cha ')
exec template % ("Word", 'cwor')
exec template % ("Line", 'clin')
exec template % ("Paragraph", 'cpar')
exec template % ("Window", 'cwin')
exec template % ("Document", 'docu')
exec template % ("File", 'file')
exec template % ("InsertionPoint", 'cins')
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 Text(seld, fr)
if want == 'cha ': return Character(seld, fr)
if want == 'cwor': return Word(seld, fr)
if want == 'clin': return Line(seld, fr)
if want == 'cpar': return Paragraph(seld, fr)
if want == 'cwin': return Window(seld, fr)
if want == 'docu': return Document(seld, fr)
if want == 'file': return File(seld, fr)
if want == 'cins': return InsertionPoint(seld, fr)
if want == 'prop' and form == 'prop' and IsType(seld):
return Property(seld.type, fr)
return ObjectSpecifier(want, form, seld, fr)
# Special code to unpack an AppleEvent (which is *not* a disguised record!)
aekeywords = [
'tran',
'rtid',
'evcl',
'evid',
'addr',
'optk',
'timo',
'inte', # this attribute is read only - will be set in AESend
'esrc', # this attribute is read only
'miss', # this attribute is read only
'from' # new in 1.0.1
]
def missed(ae):
try:
desc = ae.AEGetAttributeDesc('miss', 'keyw')
except AE.Error, msg:
return None
return desc.data
def unpackevent(ae):
parameters = {}
while 1:
key = missed(ae)
if not key: break
parameters[key] = unpack(ae.AEGetParamDesc(key, '****'))
attributes = {}
for key in aekeywords:
try:
desc = ae.AEGetAttributeDesc(key, '****')
except (AE.Error, MacOS.Error), msg:
if msg[0] != -1701:
raise sys.exc_type, sys.exc_value
continue
attributes[key] = unpack(desc)
return parameters, attributes
def packevent(ae, parameters = {}, attributes = {}):
for key, value in parameters.items():
ae.AEPutParamDesc(key, pack(value))
for key, value in attributes.items():
ae.AEPutAttributeDesc(key, pack(value))
# Test program
def test():
target = AE.AECreateDesc('sign', 'KAHL')
ae = AE.AECreateAppleEvent('aevt', 'oapp', target, -1, 0)
print unpackevent(ae)
raw_input(":")
ae = AE.AECreateAppleEvent('core', 'getd', target, -1, 0)
obj = Character(2, Word(1, Document(1)))
print obj
print repr(obj)
packevent(ae, {'----': obj})
params, attrs = unpackevent(ae)
print params['----']
raw_input(":")
if __name__ == '__main__':
test()