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New mixin class that defines cmp and hash that use

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the ob_itself pointer.  This allows (when using the mixin)
different Python objects pointing to the same C object and
behaving well as dictionary keys.

Or so sez Jack Jansen...
This commit is contained in:
Guido van Rossum 1999-03-15 16:37:54 +00:00
parent 3764595c98
commit c7e7c60756
1 changed files with 67 additions and 0 deletions
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67
Tools/bgen/bgen/bgenObjectDefinition.py
View file

@ -65,6 +65,12 @@ class ObjectDefinition(GeneratorGroup):
self.outputSetattr()
self.outputCompare()
self.outputRepr()
self.outputHash()
self.outputTypeObject()
OutHeader2("End object type " + self.name)
@ -153,6 +159,18 @@ class ObjectDefinition(GeneratorGroup):
Output()
Output("#define %s_setattr NULL", self.prefix)
def outputCompare(self):
Output()
Output("#define %s_compare NULL", self.prefix)
def outputRepr(self):
Output()
Output("#define %s_repr NULL", self.prefix)
def outputHash(self):
Output()
Output("#define %s_hash NULL", self.prefix)
def outputTypeObject(self):
sf = self.static and "staticforward "
Output()
@ -168,6 +186,12 @@ class ObjectDefinition(GeneratorGroup):
Output("0, /*tp_print*/")
Output("(getattrfunc) %s_getattr, /*tp_getattr*/", self.prefix)
Output("(setattrfunc) %s_setattr, /*tp_setattr*/", self.prefix)
Output("(cmpfunc) %s_compare, /*tp_compare*/", self.prefix)
Output("(reprfunc) %s_repr, /*tp_repr*/", self.prefix)
Output("(PyNumberMethods *)0, /* tp_as_number */")
Output("(PySequenceMethods *)0, /* tp_as_sequence */")
Output("(PyMappingMethods *)0, /* tp_as_mapping */")
Output("(hashfunc) %s_hash, /*tp_hash*/", self.prefix)
DedentLevel()
Output("};")
@ -192,3 +216,46 @@ class GlobalObjectDefinition(ObjectDefinition):
def __init__(self, name, prefix = None, itselftype = None):
ObjectDefinition.__init__(self, name, prefix or name, itselftype or name)
self.static = ""
class ObjectIdentityMixin:
"""A mixin class for objects that makes the identity of ob_itself
govern comparisons and dictionary lookups. Useful if the C object can
be returned by library calls and it is difficult (or impossible) to find
the corresponding Python objects. With this you can create Python object
wrappers on the fly"""
def outputCompare(self):
Output()
Output("static int %s_compare(self, other)", self.prefix)
IndentLevel()
Output("%s *self, *other;", self.objecttype)
DedentLevel()
OutLbrace()
Output("unsigned long v, w;")
Output()
Output("if (!%s_Check((PyObject *)other))", self.prefix)
OutLbrace()
Output("v=(unsigned long)self;")
Output("w=(unsigned long)other;")
OutRbrace()
Output("else")
OutLbrace()
Output("v=(unsigned long)self->ob_itself;")
Output("w=(unsigned long)other->ob_itself;")
OutRbrace()
Output("if( v < w ) return -1;")
Output("if( v > w ) return 1;")
Output("return 0;")
OutRbrace()
def outputHash(self):
Output()
Output("static long %s_hash(self)", self.prefix)
IndentLevel()
Output("%s *self;", self.objecttype)
DedentLevel()
OutLbrace()
Output("return (long)self->ob_itself;")
OutRbrace()