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#
# gen_ctypes.py
#
# Parse a .h header file to generate ctypes argtype and return type definitions
#
# Copyright 2004-2016, by Paul McGuire
#
from pyparsing import *
typemap = {
"byte": "c_byte",
"char": "c_char",
"char *": "c_char_p",
"double": "c_double",
"float": "c_float",
"int": "c_int",
"int16": "c_int16",
"int32": "c_int32",
"int64": "c_int64",
"int8": "c_int8",
"long": "c_long",
"longlong": "c_longlong",
"short": "c_short",
"size_t": "c_size_t",
"ubyte": "c_ubyte",
"uchar": "c_ubyte",
"u_char": "c_ubyte",
"uint": "c_uint",
"u_int": "c_uint",
"uint16": "c_uint16",
"uint32": "c_uint32",
"uint64": "c_uint64",
"uint8": "c_uint8",
"u_long": "c_ulong",
"ulong": "c_ulong",
"ulonglong": "c_ulonglong",
"ushort": "c_ushort",
"u_short": "c_ushort",
"void *": "c_void_p",
"voidp": "c_voidp",
"wchar": "c_wchar",
"wchar *": "c_wchar_p",
"Bool": "c_bool",
"void": "None",
}
LPAR, RPAR, LBRACE, RBRACE, COMMA, SEMI = Suppress.using_each("(){},;")
ident = pyparsing_common.identifier
integer = Regex(r"[+-]?\d+")
hexinteger = Regex(r"0x[0-9a-fA-F]+")
const = Suppress("const")
primitiveType = one_of(t for t in typemap if not t.endswith("*"))
structType = Suppress("struct") + ident
vartype = (
Opt(const) + (primitiveType | structType | ident) + Opt(Word("*")("ptr"))
)
def normalizetype(t):
if isinstance(t, ParseResults):
return " ".join(t)
# ~ ret = ParseResults([' '.join(t)])
# ~ return ret
vartype.set_parse_action(normalizetype)
arg = Group(vartype("argtype") + Opt(ident("argname")))
func_def = (
vartype("fn_type")
+ ident("fn_name")
+ LPAR
+ Opt(DelimitedList(arg | "..."))("fn_args")
+ RPAR
+ SEMI
)
def derivefields(t):
if t.fn_args and t.fn_args[-1] == "...":
t["varargs"] = True
func_def.set_parse_action(derivefields)
fn_typedef = "typedef" + func_def
var_typedef = "typedef" + primitiveType("primType") + ident("name") + SEMI
enum_def = (
Keyword("enum")
+ LBRACE
+ DelimitedList(Group(ident("name") + "=" + (hexinteger | integer)("value")))(
"evalues"
)
+ Opt(COMMA)
+ RBRACE
)
c_header = open("snmp_api.h").read()
module = "pynetsnmp"
user_defined_types = set()
typedefs = []
fn_typedefs = []
functions = []
enum_constants = []
# add structures commonly included from std lib headers
def addStdType(t, namespace=""):
fullname = namespace + "_" + t if namespace else t
typemap[t] = fullname
user_defined_types.add(t)
addStdType("fd_set", "sys_select")
addStdType("timeval", "sys_time")
def getUDType(typestr):
key = typestr.rstrip(" *")
if key not in typemap:
user_defined_types.add(key)
typemap[key] = "{}_{}".format(module, key)
def typeAsCtypes(typestr):
if typestr in typemap:
return typemap[typestr]
if typestr.endswith("*"):
return "POINTER(%s)" % typeAsCtypes(typestr.rstrip(" *"))
return typestr
# scan input header text for primitive typedefs
for td, _, _ in var_typedef.scan_string(c_header):
typedefs.append((td.name, td.primType))
# add typedef type to typemap to map to itself
typemap[td.name] = td.name
# scan input header text for function typedefs
fn_typedefs = fn_typedef.search_string(c_header)
# add each function typedef to typemap to map to itself
for fntd in fn_typedefs:
typemap[fntd.fn_name] = fntd.fn_name
# scan input header text, and keep running list of user-defined types
for fn, _, _ in (
cStyleComment.suppress() | fn_typedef.suppress() | func_def
).scan_string(c_header):
if not fn:
continue
getUDType(fn.fn_type)
for arg in fn.fn_args:
if arg != "...":
if arg.argtype not in typemap:
getUDType(arg.argtype)
functions.append(fn)
# scan input header text for enums
enum_def.ignore(cpp_style_comment)
for en_, _, _ in enum_def.scan_string(c_header):
for ev in en_.evalues:
enum_constants.append((ev.name, ev.value))
print("from ctypes import *")
print("{} = CDLL('{}.dll')".format(module, module))
print()
print("# user defined types")
for tdname, tdtyp in typedefs:
print("{} = {}".format(tdname, typemap[tdtyp]))
for fntd in fn_typedefs:
print(
"{} = CFUNCTYPE({})".format(
fntd.fn_name, ",\n ".join(typeAsCtypes(a.argtype) for a in fntd.fn_args)
)
)
for udtype in user_defined_types:
print("class %s(Structure): pass" % typemap[udtype])
print()
print("# constant definitions")
for en, ev in enum_constants:
print("{} = {}".format(en, ev))
print()
print("# functions")
for fn in functions:
prefix = "{}.{}".format(module, fn.fn_name)
print("{}.restype = {}".format(prefix, typeAsCtypes(fn.fn_type)))
if fn.varargs:
print("# warning - %s takes variable argument list" % prefix)
del fn.fn_args[-1]
if fn.fn_args.asList() != [["void"]]:
print(
"{}.argtypes = ({},)".format(
prefix, ",".join(typeAsCtypes(a.argtype) for a in fn.fn_args)
)
)
else:
print("%s.argtypes = ()" % (prefix))
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