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"""Provides the Module and Type base classes that user code inherits from."""
__all__ = ["Module", "Type", "member"]
from framer import struct, template
from framer.function import Function, Method
from framer.member import member
from framer.slots import *
from framer.util import cstring, unindent
from types import FunctionType
# The Module and Type classes are implemented using metaclasses,
# because most of the methods are class methods. It is easier to use
# metaclasses than the cumbersome classmethod() builtin. They have
# class methods because they are exposed to user code as base classes.
class BaseMetaclass(type):
"""Shared infrastructure for generating modules and types."""
# just methoddef so far
def dump_methoddef(self, f, functions, vars):
def p(templ, vars=vars): # helper function to generate output
print(templ % vars, file=f)
if not functions:
return
p(template.methoddef_start)
for name, func in sorted(functions.items()):
if func.__doc__:
p(template.methoddef_def_doc, func.vars)
else:
p(template.methoddef_def, func.vars)
p(template.methoddef_end)
class ModuleMetaclass(BaseMetaclass):
"""Provides methods for Module class."""
def gen(self):
self.analyze()
self.initvars()
f = open(self.__filename, "w")
self.dump(f)
f.close()
def analyze(self):
self.name = getattr(self, "abbrev", self.__name__)
self.__functions = {}
self.__types = {}
self.__members = False
for name, obj in self.__dict__.items():
if isinstance(obj, FunctionType):
self.__functions[name] = Function(obj, self)
elif isinstance(obj, TypeMetaclass):
obj._TypeMetaclass__module = self.name
obj.analyze()
self.__types[name] = obj
if obj.has_members():
self.__members = True
def initvars(self):
v = self.__vars = {}
filename = getattr(self, "__file__", None)
if filename is None:
filename = self.__name__ + "module.c"
self.__filename = v["FileName"] = filename
name = v["ModuleName"] = self.__name__
v["MethodDefName"] = "%s_methods" % name
v["ModuleDocstring"] = cstring(unindent(self.__doc__))
def dump(self, f):
def p(templ, vars=self.__vars): # helper function to generate output
print(templ % vars, file=f)
p(template.module_start)
if self.__members:
p(template.member_include)
print(file=f)
if self.__doc__:
p(template.module_doc)
for name, type in sorted(self.__types.items()):
type.dump(f)
for name, func in sorted(self.__functions.items()):
func.dump(f)
self.dump_methoddef(f, self.__functions, self.__vars)
p(template.module_init_start)
for name, type in sorted(self.__types.items()):
type.dump_init(f)
p("}")
class Module(metaclass=ModuleMetaclass):
pass
class TypeMetaclass(BaseMetaclass):
def dump(self, f):
self.initvars()
# defined after initvars() so that __vars is defined
def p(templ, vars=self.__vars):
print(templ % vars, file=f)
if self.struct is not None:
print(unindent(self.struct, False), file=f)
if self.__doc__:
p(template.docstring)
for name, func in sorted(self.__methods.items()):
func.dump(f)
self.dump_methoddef(f, self.__methods, self.__vars)
self.dump_memberdef(f)
self.dump_slots(f)
def has_members(self):
if self.__members:
return True
else:
return False
def analyze(self):
# called by ModuleMetaclass analyze()
self.name = getattr(self, "abbrev", self.__name__)
src = getattr(self, "struct", None)
if src is not None:
self.__struct = struct.parse(src)
else:
self.__struct = None
self.__methods = {}
self.__members = {}
for cls in self.__mro__:
for k, v in cls.__dict__.items():
if isinstance(v, FunctionType):
self.__methods[k] = Method(v, self)
if isinstance(v, member):
self.__members[k] = v
assert self.__struct is not None
v.register(k, self.__struct)
self.analyze_slots()
def analyze_slots(self):
self.__slots = {}
for s in Slots:
if s.special is not None:
meth = self.__methods.get(s.special)
if meth is not None:
self.__slots[s] = meth
self.__slots[TP_NAME] = '"%s.%s"' % (self.__module, self.__name__)
if self.__doc__:
self.__slots[TP_DOC] = "%s_doc" % self.name
if self.__struct is not None:
self.__slots[TP_BASICSIZE] = "sizeof(%s)" % self.__struct.name
self.__slots[TP_DEALLOC] = "%s_dealloc" % self.name
if self.__methods:
self.__slots[TP_METHODS] = "%s_methods" % self.name
if self.__members:
self.__slots[TP_MEMBERS] = "%s_members" % self.name
def initvars(self):
v = self.__vars = {}
v["TypeName"] = self.__name__
v["CTypeName"] = "Py%s_Type" % self.__name__
v["MethodDefName"] = self.__slots[TP_METHODS]
if self.__doc__:
v["DocstringVar"] = self.__slots[TP_DOC]
v["Docstring"] = cstring(unindent(self.__doc__))
if self.__struct is not None:
v["StructName"] = self.__struct.name
if self.__members:
v["MemberDefName"] = self.__slots[TP_MEMBERS]
def dump_memberdef(self, f):
def p(templ, vars=self.__vars):
print(templ % vars, file=f)
if not self.__members:
return
p(template.memberdef_start)
for name, slot in sorted(self.__members.items()):
slot.dump(f)
p(template.memberdef_end)
def dump_slots(self, f):
def p(templ, vars=self.__vars):
print(templ % vars, file=f)
if self.struct:
p(template.dealloc_func, {"name" : self.__slots[TP_DEALLOC]})
p(template.type_struct_start)
for s in Slots[:-5]: # XXX
val = self.__slots.get(s, s.default)
ntabs = 4 - (4 + len(val)) // 8
line = " %s,%s/* %s */" % (val, "\t" * ntabs, s.name)
print(line, file=f)
p(template.type_struct_end)
def dump_init(self, f):
def p(templ):
print(templ % self.__vars, file=f)
p(template.type_init_type)
p(template.module_add_type)
class Type(metaclass=TypeMetaclass):
pass
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