# 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

# Declarations that change for each manager
MACHEADERFILE = 'Lists.h'		# The Apple header file
MODNAME = 'List'				# The name of the module
OBJECTNAME = 'List'			# The basic name of the objects used here
KIND = 'Handle'				# Usually 'Ptr' or 'Handle'

# The following is *usually* unchanged but may still require tuning
MODPREFIX = MODNAME			# The prefix for module-wide routines
OBJECTTYPE = "ListRef"		# 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
ListRef = OpaqueByValueType("ListRef", "ListObj")
Cell = Point
VarOutBufferShortsize = VarHeapOutputBufferType('char', 'short', 's')	# (buf, &len)
InBufferShortsize = VarInputBufferType('char', 'short', 's')		# (buf, len)

# For LUpdate, we alsways update the complete visible region.
RgnHandle = FakeType("(*_self->ob_itself)->port->visRgn")


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

class ListMethodGenerator(MethodGenerator):
	"""Similar to MethodGenerator, but has self as last argument"""

	def parseArgumentList(self, args):
		args, a0 = args[:-1], args[-1]
		t0, n0, m0 = a0
		if m0 != InMode:
			raise ValueError, "method's 'self' must be 'InMode'"
		self.itself = Variable(t0, "_self->ob_itself", SelfMode)
		FunctionGenerator.parseArgumentList(self, args)
		self.argumentList.append(self.itself)



class MyObjectDefinition(GlobalObjectDefinition):
	def outputCheckNewArg(self):
		Output("""if (itself == NULL) {
					PyErr_SetString(List_Error,"Cannot create null List");
					return NULL;
				}""")
	def outputFreeIt(self, itselfname):
		Output("LDispose(%s);", itselfname)

# From here on it's basically all boiler plate...

# 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 = FunctionGenerator
Method = ListMethodGenerator

# Create and populate the lists
functions = []
methods = []
execfile(INPUTFILE)

# add the populated lists to the generator groups
# (in a different wordl the scan program would generate this)
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()