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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 = map(Suppress,"(){},;")
ident = Word(alphas, alphanums + "_")
integer = Regex(r"[+-]?\d+")
hexinteger = Regex(r"0x[0-9a-fA-F]+")
const = Suppress("const")
primitiveType = oneOf(t for t in typemap if not t.endswith("*"))
structType = Suppress("struct") + ident
vartype = (Optional(const) +
(primitiveType | structType | ident) +
Optional(Word("*")("ptr")))
def normalizetype(t):
if isinstance(t, ParseResults):
return ' '.join(t)
#~ ret = ParseResults([' '.join(t)])
#~ return ret
vartype.setParseAction(normalizetype)
arg = Group(vartype("argtype") + Optional(ident("argname")))
func_def = (vartype("fn_type") + ident("fn_name") +
LPAR + Optional(delimitedList(arg|"..."))("fn_args") + RPAR + SEMI)
def derivefields(t):
if t.fn_args and t.fn_args[-1] == "...":
t["varargs"]=True
func_def.setParseAction(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")
+ Optional(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] = "%s_%s" % (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.scanString(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.searchString(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).scanString(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(cppStyleComment)
for en_,_,_ in enum_def.scanString(c_header):
for ev in en_.evalues:
enum_constants.append( (ev.name, ev.value) )
print("from ctypes import *")
print("%s = CDLL('%s.dll')" % (module, module))
print()
print("# user defined types")
for tdname,tdtyp in typedefs:
print("%s = %s" % (tdname, typemap[tdtyp]))
for fntd in fn_typedefs:
print("%s = CFUNCTYPE(%s)" % (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("%s = %s" % (en,ev))
print()
print("# functions")
for fn in functions:
prefix = "%s.%s" % (module, fn.fn_name)
print("%s.restype = %s" % (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("%s.argtypes = (%s,)" % (prefix, ','.join(typeAsCtypes(a.argtype) for a in fn.fn_args)))
else:
print("%s.argtypes = ()" % (prefix))
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