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"""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)


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