# This script generates a Python interface for an Apple Macintosh Manager.
# It uses the "bgen" package to generate C code.
# The function specifications are generated by scanning the mamager's header file,
# using the "scantools" package (customized for this particular manager).

import string

import addpack
addpack.addpack(':Tools:bgen:bgen')

# Declarations that change for each manager
MACHEADERFILE = 'Controls.h'		# The Apple header file
MODNAME = 'Ctl'				# The name of the module
OBJECTNAME = 'Control'			# The basic name of the objects used here

# The following is *usually* unchanged but may still require tuning
MODPREFIX = MODNAME			# The prefix for module-wide routines
OBJECTTYPE = OBJECTNAME + 'Handle'	# The C type used to represent them
OBJECTPREFIX = MODPREFIX + 'Obj'	# The prefix for object methods
INPUTFILE = string.lower(MODPREFIX) + 'gen.py' # The file generated by the scanner
OUTPUTFILE = MODNAME + "module.c"	# The file generated by this program

from macsupport import *

# Create the type objects

ControlHandle = OpaqueByValueType(OBJECTTYPE, OBJECTPREFIX)
ControlRef = ControlHandle
ExistingControlHandle = OpaqueByValueType(OBJECTTYPE, "CtlObj_WhichControl", "BUG")

RgnHandle = OpaqueByValueType("RgnHandle", "ResObj")
ControlPartCode = Type("ControlPartCode", "h")
DragConstraint = Type("DragConstraint", "h")

includestuff = includestuff + """
#include <%s>""" % MACHEADERFILE + """

#define resNotFound -192 /* Can't include <Errors.h> because of Python's "errors.h" */

extern PyObject *CtlObj_WhichControl(ControlHandle); /* Forward */

#ifdef THINK_C
#define  ControlActionUPP ProcPtr
#endif
"""

finalstuff = finalstuff + """
PyObject *
CtlObj_WhichControl(ControlHandle c)
{
	PyObject *it;
	
	/* XXX What if we find a control belonging to some other package? */
	if (c == NULL)
		it = NULL;
	else
		it = (PyObject *) GetCRefCon(c);
	if (it == NULL || ((ControlObject *)it)->ob_itself != c)
		it = Py_None;
	Py_INCREF(it);
	return it;
}
"""

class MyObjectDefinition(GlobalObjectDefinition):
	def outputCheckNewArg(self):
		Output("if (itself == NULL) return PyMac_Error(resNotFound);")
	def outputInitStructMembers(self):
		GlobalObjectDefinition.outputInitStructMembers(self)
		Output("SetCRefCon(itself, (long)it);")
	def outputCleanupStructMembers(self):
		Output("if (self->ob_itself) SetCRefCon(self->ob_itself, (long)0); /* Make it forget about us */")
		
# Create the generator groups and link them
module = MacModule(MODNAME, MODPREFIX, includestuff, finalstuff, initstuff)
object = MyObjectDefinition(OBJECTNAME, OBJECTPREFIX, OBJECTTYPE)
module.addobject(object)

# Create the generator classes used to populate the lists
Function = OSErrFunctionGenerator
Method = OSErrMethodGenerator

# Create and populate the lists
functions = []
methods = []
execfile(INPUTFILE)
execfile('ctledit.py')

# add the populated lists to the generator groups
for f in functions: module.add(f)
for f in methods: object.add(f)

# generate output (open the output file as late as possible)
SetOutputFileName(OUTPUTFILE)
module.generate()
