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#!/usr/bin/env python
'''Generate a Python ctypes wrapper file for a header file.
Usage example::
wrap.py -lGL -oGL.py /usr/include/GL/gl.h
>>> from GL import *
'''
from __future__ import print_function
__docformat__ = 'restructuredtext'
__version__ = '$Id$'
from ctypesparser import *
import textwrap
import sys
class CtypesWrapper(CtypesParser, CtypesTypeVisitor):
file=None
def begin_output(self, output_file, library, link_modules=(),
emit_filenames=(), all_headers=False):
self.library = library
self.file = output_file
self.all_names = []
self.known_types = {}
self.structs = set()
self.enums = set()
self.emit_filenames = emit_filenames
self.all_headers = all_headers
self.linked_symbols = {}
for name in link_modules:
module = __import__(name, globals(), locals(), ['foo'])
for symbol in dir(module):
if symbol not in self.linked_symbols:
self.linked_symbols[symbol] = '%s.%s' % (name, symbol)
self.link_modules = link_modules
self.print_preamble()
self.print_link_modules_imports()
def wrap(self, filename, source=None):
assert self.file, 'Call begin_output first'
self.parse(filename, source)
def end_output(self):
self.print_epilogue()
self.file = None
def does_emit(self, symbol, filename):
return self.all_headers or filename in self.emit_filenames
def print_preamble(self):
import textwrap
import time
print(textwrap.dedent("""
'''Wrapper for %(library)s
Generated with:
%(argv)s
Do not modify this file.
'''
__docformat__ = 'restructuredtext'
__version__ = '$Id$'
import ctypes
from ctypes import *
import pyglet.lib
_lib = pyglet.lib.load_library(%(library)r)
_int_types = (c_int16, c_int32)
if hasattr(ctypes, 'c_int64'):
# Some builds of ctypes apparently do not have c_int64
# defined; it's a pretty good bet that these builds do not
# have 64-bit pointers.
_int_types += (ctypes.c_int64,)
for t in _int_types:
if sizeof(t) == sizeof(c_size_t):
c_ptrdiff_t = t
class c_void(Structure):
# c_void_p is a buggy return type, converting to int, so
# POINTER(None) == c_void_p is actually written as
# POINTER(c_void), so it can be treated as a real pointer.
_fields_ = [('dummy', c_int)]
""" % {
'library': self.library,
'date': time.ctime(),
'class': self.__class__.__name__,
'argv': ' '.join(sys.argv),
}).lstrip(), file=self.file)
def print_link_modules_imports(self):
for name in self.link_modules:
print('import %s' % name, file=self.file)
print(file=self.file)
def print_epilogue(self):
print(file=self.file)
print('\n'.join(textwrap.wrap(
'__all__ = [%s]' % ', '.join([repr(n) for n in self.all_names]),
width=78,
break_long_words=False)), file=self.file)
def handle_ctypes_constant(self, name, value, filename, lineno):
if self.does_emit(name, filename):
print('%s = %r' % (name, value), end=' ', file=self.file)
print('\t# %s:%d' % (filename, lineno), file=self.file)
self.all_names.append(name)
def handle_ctypes_type_definition(self, name, ctype, filename, lineno):
if self.does_emit(name, filename):
self.all_names.append(name)
if name in self.linked_symbols:
print('%s = %s' % \
(name, self.linked_symbols[name]), file=self.file)
else:
ctype.visit(self)
self.emit_type(ctype)
print('%s = %s' % (name, str(ctype)), end=' ', file=self.file)
print('\t# %s:%d' % (filename, lineno), file=self.file)
else:
self.known_types[name] = (ctype, filename, lineno)
def emit_type(self, t):
t.visit(self)
for s in t.get_required_type_names():
if s in self.known_types:
if s in self.linked_symbols:
print('%s = %s' % (s, self.linked_symbols[s]), file=self.file)
else:
s_ctype, s_filename, s_lineno = self.known_types[s]
s_ctype.visit(self)
self.emit_type(s_ctype)
print('%s = %s' % (s, str(s_ctype)), end=' ', file=self.file)
print('\t# %s:%d' % (s_filename, s_lineno), file=self.file)
del self.known_types[s]
def visit_struct(self, struct):
if struct.tag in self.structs:
return
self.structs.add(struct.tag)
base = {True: 'Union', False: 'Structure'}[struct.is_union]
print('class struct_%s(%s):' % (struct.tag, base), file=self.file)
print(' __slots__ = [', file=self.file)
if not struct.opaque:
for m in struct.members:
print(" '%s'," % m[0], file=self.file)
print(' ]', file=self.file)
# Set fields after completing class, so incomplete structs can be
# referenced within struct.
for name, typ in struct.members:
self.emit_type(typ)
print('struct_%s._fields_ = [' % struct.tag, file=self.file)
if struct.opaque:
print(" ('_opaque_struct', c_int)", file=self.file)
self.structs.remove(struct.tag)
else:
for m in struct.members:
print(" ('%s', %s)," % (m[0], m[1]), file=self.file)
print(']', file=self.file)
print(file=self.file)
def visit_enum(self, enum):
if enum.tag in self.enums:
return
self.enums.add(enum.tag)
print('enum_%s = c_int' % enum.tag, file=self.file)
for name, value in enum.enumerators:
self.all_names.append(name)
print('%s = %d' % (name, value), file=self.file)
def handle_ctypes_function(self, name, restype, argtypes, filename, lineno):
if self.does_emit(name, filename):
# Also emit any types this func requires that haven't yet been
# written.
self.emit_type(restype)
for a in argtypes:
self.emit_type(a)
self.all_names.append(name)
print('# %s:%d' % (filename, lineno), file=self.file)
print('%s = _lib.%s' % (name, name), file=self.file)
print('%s.restype = %s' % (name, str(restype)), file=self.file)
print('%s.argtypes = [%s]' % \
(name, ', '.join([str(a) for a in argtypes])), file=self.file)
print(file=self.file)
def handle_ctypes_variable(self, name, ctype, filename, lineno):
# This doesn't work.
#self.all_names.append(name)
#print >> self.file, '%s = %s.indll(_lib, %r)' % \
# (name, str(ctype), name)
pass
def main(*argv):
import optparse
import sys
import os.path
usage = 'usage: %prog [options] <header.h>'
op = optparse.OptionParser(usage=usage)
op.add_option('-o', '--output', dest='output',
help='write wrapper to FILE', metavar='FILE')
op.add_option('-l', '--library', dest='library',
help='link to LIBRARY', metavar='LIBRARY')
op.add_option('-D', '--define', dest='defines', default=[],
help='define token NAME=VALUE', action='append')
op.add_option('-i', '--include-file', action='append', dest='include_files',
help='assume FILE is iincluded', metavar='FILE',
default=[])
op.add_option('-I', '--include-dir', action='append', dest='include_dirs',
help='add DIR to include search path', metavar='DIR',
default=[])
op.add_option('-m', '--link-module', action='append', dest='link_modules',
help='use symbols from MODULE', metavar='MODULE',
default=[])
op.add_option('-a', '--all-headers', action='store_true',
dest='all_headers',
help='include symbols from all headers', default=False)
(options, args) = op.parse_args(list(argv[1:]))
if len(args) < 1:
print('No header files specified.', file=sys.stderr)
sys.exit(1)
headers = args
if options.library is None:
options.library = os.path.splitext(headers[0])[0]
if options.output is None:
options.output = '%s.py' % options.library
wrapper = CtypesWrapper()
wrapper.begin_output(open(options.output, 'w'),
library=options.library,
emit_filenames=headers,
link_modules=options.link_modules,
all_headers=options.all_headers)
wrapper.preprocessor_parser.include_path += options.include_dirs
for define in options.defines:
name, value = define.split('=')
wrapper.preprocessor_parser.define(name, value)
for file in options.include_files:
wrapper.wrap(file)
for header in headers:
wrapper.wrap(header)
wrapper.end_output()
print('Wrapped to %s' % options.output)
if __name__ == '__main__':
main(*sys.argv)
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