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function.py
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173 lines (133 loc) · 4.15 KB
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"""Functions."""
from framer import template
from framer.util import cstring, unindent
METH_O = "METH_O"
METH_NOARGS = "METH_NOARGS"
METH_VARARGS = "METH_VARARGS"
def parsefmt(fmt):
for c in fmt:
if c == '|':
continue
yield c
class Argument:
def __init__(self, name):
self.name = name
self.ctype = "PyObject *"
self.default = None
def __str__(self):
return "%s%s" % (self.ctype, self.name)
def setfmt(self, code):
self.ctype = self._codes[code]
if self.ctype[-1] != "*":
self.ctype += " "
_codes = {"O": "PyObject *",
"i": "int",
}
def decl(self):
if self.default is None:
return str(self) + ";"
else:
return "%s = %s;" % (self, self.default)
class _ArgumentList(object):
# these instance variables should be initialized by subclasses
ml_meth = None
fmt = None
def __init__(self, args):
self.args = map(Argument, args)
def __len__(self):
return len(self.args)
def __getitem__(self, i):
return self.args[i]
def dump_decls(self, f):
pass
class NoArgs(_ArgumentList):
def __init__(self, args):
assert len(args) == 0
super(NoArgs, self).__init__(args)
self.ml_meth = METH_NOARGS
def c_args(self):
return "PyObject *self"
class OneArg(_ArgumentList):
def __init__(self, args):
assert len(args) == 1
super(OneArg, self).__init__(args)
self.ml_meth = METH_O
def c_args(self):
return "PyObject *self, %s" % self.args[0]
class VarArgs(_ArgumentList):
def __init__(self, args, fmt=None):
super(VarArgs, self).__init__(args)
self.ml_meth = METH_VARARGS
if fmt is not None:
self.fmt = fmt
i = 0
for code in parsefmt(fmt):
self.args[i].setfmt(code)
i += 1
def c_args(self):
return "PyObject *self, PyObject *args"
def targets(self):
return ", ".join(["&%s" % a.name for a in self.args])
def dump_decls(self, f):
for a in self.args:
print >> f, " %s" % a.decl()
def ArgumentList(func, method):
code = func.func_code
args = code.co_varnames[:code.co_argcount]
if method:
args = args[1:]
pyarg = getattr(func, "pyarg", None)
if pyarg is not None:
args = VarArgs(args, pyarg)
if func.func_defaults:
L = list(func.func_defaults)
ndefault = len(L)
i = len(args) - ndefault
while L:
args[i].default = L.pop(0)
return args
else:
if len(args) == 0:
return NoArgs(args)
elif len(args) == 1:
return OneArg(args)
else:
return VarArgs(args)
class Function:
method = False
def __init__(self, func, parent):
self._func = func
self._parent = parent
self.analyze()
self.initvars()
def dump(self, f):
def p(templ, vars=None): # helper function to generate output
if vars is None:
vars = self.vars
print >> f, templ % vars
if self.__doc__:
p(template.docstring)
d = {"name" : self.vars["CName"],
"args" : self.args.c_args(),
}
p(template.funcdef_start, d)
self.args.dump_decls(f)
if self.args.ml_meth == METH_VARARGS:
p(template.varargs)
p(template.funcdef_end)
def analyze(self):
self.__doc__ = self._func.__doc__
self.args = ArgumentList(self._func, self.method)
def initvars(self):
v = self.vars = {}
v["PythonName"] = self._func.__name__
s = v["CName"] = "%s_%s" % (self._parent.name, self._func.__name__)
v["DocstringVar"] = s + "_doc"
v["MethType"] = self.args.ml_meth
if self.__doc__:
v["Docstring"] = cstring(unindent(self.__doc__))
if self.args.fmt is not None:
v["ArgParse"] = self.args.fmt
v["ArgTargets"] = self.args.targets()
class Method(Function):
method = True