/usr/share/pygobject/2.0/codegen/reversewrapper.py is in python-gobject-2-dev 2.28.6-12build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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### Code to generate "Reverse Wrappers", i.e. C->Python wrappers
### (C) 2004 Gustavo Carneiro <gjc@gnome.org>
import argtypes
import os
DEBUG_MODE = ('PYGTK_CODEGEN_DEBUG' in os.environ)
def join_ctype_name(ctype, name):
'''Joins a C type and a variable name into a single string'''
if ctype[-1] != '*':
return " ".join((ctype, name))
else:
return "".join((ctype, name))
class CodeSink(object):
def __init__(self):
self.indent_level = 0 # current indent level
self.indent_stack = [] # previous indent levels
def _format_code(self, code):
assert isinstance(code, str)
l = []
for line in code.split('\n'):
l.append(' '*self.indent_level + line)
if l[-1]:
l.append('')
return '\n'.join(l)
def writeln(self, line=''):
raise NotImplementedError
def indent(self, level=4):
'''Add a certain ammount of indentation to all lines written
from now on and until unindent() is called'''
self.indent_stack.append(self.indent_level)
self.indent_level += level
def unindent(self):
'''Revert indentation level to the value before last indent() call'''
self.indent_level = self.indent_stack.pop()
class FileCodeSink(CodeSink):
def __init__(self, fp):
CodeSink.__init__(self)
assert isinstance(fp, file)
self.fp = fp
def writeln(self, line=''):
self.fp.write(self._format_code(line))
class MemoryCodeSink(CodeSink):
def __init__(self):
CodeSink.__init__(self)
self.lines = []
def writeln(self, line=''):
self.lines.append(self._format_code(line))
def flush_to(self, sink):
assert isinstance(sink, CodeSink)
for line in self.lines:
sink.writeln(line.rstrip())
self.lines = []
def flush(self):
l = []
for line in self.lines:
l.append(self._format_code(line))
self.lines = []
return "".join(l)
class ReverseWrapper(object):
'''Object that generates a C->Python wrapper'''
def __init__(self, cname, is_static=True):
assert isinstance(cname, str)
self.cname = cname
## function object we will call, or object whose method we will call
self.called_pyobj = None
## name of method of self.called_pyobj we will call
self.method_name = None
self.is_static = is_static
self.parameters = []
self.declarations = MemoryCodeSink()
self.post_return_code = MemoryCodeSink()
self.body = MemoryCodeSink()
self.check_exception_code = MemoryCodeSink()
self.cleanup_actions = []
self.pyargv_items = []
self.pyargv_optional_items = []
self.pyret_parse_items = [] # list of (format_spec, parameter)
self.code_sinks_stack = [self.body]
def set_call_target(self, called_pyobj, method_name=None):
assert called_pyobj is not None
assert self.called_pyobj is None
self.called_pyobj = called_pyobj
self.method_name = method_name
def set_return_type(self, return_type):
assert isinstance(return_type, ReturnType)
self.return_type = return_type
def add_parameter(self, param):
assert isinstance(param, Parameter)
self.parameters.append(param)
def add_declaration(self, decl_code):
self.declarations.writeln(decl_code)
def add_pyargv_item(self, variable, optional=False):
if optional:
self.pyargv_optional_items.append(variable)
else:
self.pyargv_items.append(variable)
def add_pyret_parse_item(self, format_specifier, parameter, prepend=False):
if prepend:
self.pyret_parse_items.insert(0, (format_specifier, parameter))
else:
self.pyret_parse_items.append((format_specifier, parameter))
def push_code_sink(self, code_sink):
self.code_sinks_stack.insert(0, code_sink)
def pop_code_sink(self):
return self.code_sinks_stack.pop(0)
def write_code(self, code,
cleanup=None,
failure_expression=None,
failure_cleanup=None,
failure_exception=None,
code_sink=None):
'''Add a chunk of code with cleanup and error handling
This method is to be used by TypeHandlers when generating code
Keywork arguments:
code -- code to add
cleanup -- code to cleanup any dynamic resources created by @code
(except in case of failure) (default None)
failure_expression -- C boolean expression to indicate
if anything failed (default None)
failure_cleanup -- code to cleanup any dynamic resources
created by @code in case of failure (default None)
failure_exception -- code to raise an exception in case of
failure (which will be immediately
printed and cleared), (default None)
code_sink -- "code sink" to use; by default,
ReverseWrapper.body is used, which writes the
main body of the wrapper, before calling the
python method. Alternatively,
ReverseWrapper.after_pyret_parse can be used, to
write code after the PyArg_ParseTuple that
parses the python method return value.
'''
if code_sink is None:
code_sink = self.code_sinks_stack[0]
if code is not None:
code_sink.writeln(code)
if failure_expression is not None:
code_sink.writeln("if (%s) {" % (failure_expression,))
code_sink.indent()
if failure_exception is None:
code_sink.writeln("if (PyErr_Occurred())")
code_sink.indent()
code_sink.writeln("PyErr_Print();")
code_sink.unindent()
else:
code_sink.writeln(failure_exception)
code_sink.writeln("PyErr_Print();")
if failure_cleanup is not None:
code_sink.writeln(failure_cleanup)
for cleanup_action in self.cleanup_actions:
code_sink.writeln(cleanup_action)
self.push_code_sink(code_sink)
try:
self.return_type.write_error_return()
finally:
self.pop_code_sink()
code_sink.unindent()
code_sink.writeln("}")
if cleanup is not None:
self.cleanup_actions.insert(0, cleanup)
def generate(self, sink):
'''Generate the code into a CodeSink object'''
assert isinstance(sink, CodeSink)
if DEBUG_MODE:
self.declarations.writeln("/* begin declarations */")
self.body.writeln("/* begin main body */")
self.post_return_code.writeln("/* begin post-return code */")
self.add_declaration("PyGILState_STATE __py_state;")
self.write_code(code="__py_state = pyg_gil_state_ensure();",
cleanup="pyg_gil_state_release(__py_state);")
for param in self.parameters:
param.convert_c2py()
assert self.called_pyobj is not None,\
"Parameters failed to provide a target function or method."
if self.is_static:
sink.writeln('static %s' % self.return_type.get_c_type())
else:
sink.writeln(self.return_type.get_c_type())
c_proto_params = map(Parameter.format_for_c_proto, self.parameters)
sink.writeln("%s(%s)\n{" % (self.cname, ", ".join(c_proto_params)))
self.return_type.write_decl()
self.add_declaration("PyObject *py_retval;")
## Handle number of arguments
if self.pyargv_items:
self.add_declaration("PyObject *py_args;")
py_args = "py_args"
if self.pyargv_optional_items:
self.add_declaration("int argc = %i;" % len(self.pyargv_items))
argc = "argc"
for arg in self.pyargv_optional_items:
self.body.writeln("if (%s)" % arg)
self.body.indent()
self.body.writeln("++argc;")
self.body.unindent()
else:
argc = str(len(self.pyargv_items))
else:
if self.pyargv_optional_items:
self.add_declaration("PyObject *py_args;")
py_args = "py_args"
self.add_declaration("int argc = 0;")
argc = "argc"
for arg in self.pyargv_optional_items:
self.body.writeln("if (%s)" % arg)
self.body.indent()
self.body.writeln("++argc;")
self.body.unindent()
else:
py_args = "NULL"
argc = None
self.body.writeln()
if py_args != "NULL":
self.write_code("py_args = PyTuple_New(%s);" % argc,
cleanup="Py_DECREF(py_args);")
pos = 0
for arg in self.pyargv_items:
try: # try to remove the Py_DECREF cleanup action, if we can
self.cleanup_actions.remove("Py_DECREF(%s);" % arg)
except ValueError: # otherwise we have to Py_INCREF..
self.body.writeln("Py_INCREF(%s);" % arg)
self.body.writeln("PyTuple_SET_ITEM(%s, %i, %s);" % (py_args, pos, arg))
pos += 1
for arg in self.pyargv_optional_items:
self.body.writeln("if (%s) {" % arg)
self.body.indent()
try: # try to remove the Py_DECREF cleanup action, if we can
self.cleanup_actions.remove("Py_XDECREF(%s);" % arg)
except ValueError: # otherwise we have to Py_INCREF..
self.body.writeln("Py_INCREF(%s);" % arg)
self.body.writeln("PyTuple_SET_ITEM(%s, %i, %s);" % (py_args, pos, arg))
self.body.unindent()
self.body.writeln("}")
pos += 1
self.body.writeln()
## Call the python method
if self.method_name is None:
self.write_code("py_retval = PyObject_Call(%s, %s);"
% (self.called_pyobj, py_args),
cleanup="Py_XDECREF(py_retval);")
self.check_exception_code.flush_to(self.body)
self.write_code(None, failure_expression="!py_retval")
else:
self.add_declaration("PyObject *py_method;")
self.write_code("py_method = PyObject_GetAttrString(%s, \"%s\");"
% (self.called_pyobj, self.method_name),
cleanup="Py_DECREF(py_method);",
failure_expression="!py_method")
self.write_code("py_retval = PyObject_CallObject(py_method, %s);"
% (py_args,),
cleanup="Py_XDECREF(py_retval);")
self.check_exception_code.flush_to(self.body)
self.write_code(None, failure_expression="!py_retval")
## -- Handle the return value --
## we need to check if the return_type object is prepared to cooperate with multiple return values
len_before = len(self.pyret_parse_items)
self.return_type.write_conversion()
len_after = len(self.pyret_parse_items)
assert (self.return_type.get_c_type() == 'void'
or not (len_before == len_after and len_after > 0)),\
("Bug in reverse wrappers: return type handler %s"
" is not prepared to cooperate multiple return values") % (type(self.return_type),)
sink.indent()
if self.pyret_parse_items == [("", "")]:
## special case when there are no return parameters
self.write_code(
code=None,
failure_expression='py_retval != Py_None',
failure_exception=('PyErr_SetString(PyExc_TypeError, '
'"virtual method should return None");'))
else:
if len(self.pyret_parse_items) == 1:
## if retval is one item only, pack it in a tuple so we
## can use PyArg_ParseTuple as usual..
self.write_code('py_retval = Py_BuildValue("(N)", py_retval);')
if len(self.pyret_parse_items) > 0:
## Parse return values using PyArg_ParseTuple
params = ["py_retval",
'"%s"' % "".join([format for format, param in self.pyret_parse_items])]
params.extend([param for format, param in self.pyret_parse_items if param])
self.write_code(code=None, failure_expression=(
'!PyArg_ParseTuple(%s)' % (', '.join(params),)))
if DEBUG_MODE:
self.declarations.writeln("/* end declarations */")
self.declarations.flush_to(sink)
sink.writeln()
if DEBUG_MODE:
self.body.writeln("/* end main body */")
self.body.flush_to(sink)
sink.writeln()
if DEBUG_MODE:
self.post_return_code.writeln("/* end post-return code */")
self.post_return_code.flush_to(sink)
sink.writeln()
for cleanup_action in self.cleanup_actions:
sink.writeln(cleanup_action)
if self.return_type.get_c_type() != 'void':
sink.writeln()
sink.writeln("return retval;")
sink.unindent()
sink.writeln("}")
class TypeHandler(object):
def __init__(self, wrapper, **props):
assert isinstance(wrapper, ReverseWrapper)
self.wrapper = wrapper
self.props = props
class ReturnType(TypeHandler):
supports_optional = False
def get_c_type(self):
raise NotImplementedError
def write_decl(self):
raise NotImplementedError
def write_error_return(self):
'''Write "return <value>" code in case of error'''
raise NotImplementedError
def write_conversion(self):
'''Writes code to convert Python return value in 'py_retval'
into C 'retval'. Returns a string with C boolean expression
that determines if anything went wrong. '''
raise NotImplementedError
class Parameter(TypeHandler):
def __init__(self, wrapper, name, **props):
TypeHandler.__init__(self, wrapper, **props)
self.name = name
def get_c_type(self):
raise NotImplementedError
def convert_c2py(self):
'''Write some code before calling the Python method.'''
pass
def format_for_c_proto(self):
return join_ctype_name(self.get_c_type(), self.name)
###---
class StringParam(Parameter):
def get_c_type(self):
return self.props.get('c_type', 'char *').replace('const-', 'const ')
def convert_c2py(self):
if self.props.get('optional', False):
self.wrapper.add_declaration("PyObject *py_%s = NULL;" % self.name)
self.wrapper.write_code(code=("if (%s)\n"
" py_%s = PyString_FromString(%s);\n"
% (self.name, self.name, self.name)),
cleanup=("Py_XDECREF(py_%s);" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name, optional=True)
elif self.props.get('nullok', False):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(code=("if (%s)\n"
" py_%s = PyString_FromString(%s);\n"
"else {\n"
" Py_INCREF(Py_None);\n"
" py_%s = Py_None;\n"
"}\n"
% (self.name, self.name, self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
else:
self.wrapper.add_declaration("PyObject *py_%s = NULL;" % self.name)
self.wrapper.write_code(code=("if (%s)\n"
" py_%s = PyString_FromString(%s);\n" %
(self.name, self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name),
failure_expression=("!py_%s" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
for ctype in ('char*', 'gchar*', 'const-char*', 'char-const*', 'const-gchar*',
'gchar-const*', 'string', 'static_string'):
argtypes.matcher.register_reverse(ctype, StringParam)
del ctype
class StringReturn(ReturnType):
def get_c_type(self):
return self.props.get('c_type', 'char *').replace('const-', 'const ')
#return "char *"
def write_decl(self):
self.wrapper.add_declaration("%s retval;" % self.get_c_type())
#self.wrapper.add_declaration("char *retval;")
def write_error_return(self):
self.wrapper.write_code("return NULL;")
def write_conversion(self):
self.wrapper.add_pyret_parse_item("s", "&retval", prepend=True)
self.wrapper.write_code("retval = g_strdup(retval);", code_sink=self.wrapper.post_return_code)
for ctype in ('char*', 'gchar*', 'const-gchar*'):
argtypes.matcher.register_reverse_ret(ctype, StringReturn)
del ctype
class VoidReturn(ReturnType):
def get_c_type(self):
return "void"
def write_decl(self):
pass
def write_error_return(self):
self.wrapper.write_code("return;")
def write_conversion(self):
self.wrapper.add_pyret_parse_item("", "", prepend=True)
argtypes.matcher.register_reverse_ret('void', VoidReturn)
argtypes.matcher.register_reverse_ret('none', VoidReturn)
class GObjectParam(Parameter):
def get_c_type(self):
return self.props.get('c_type', 'GObject *')
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s = NULL;" % self.name)
self.wrapper.write_code(code=("if (%s)\n"
" py_%s = pygobject_new((GObject *) %s);\n"
"else {\n"
" Py_INCREF(Py_None);\n"
" py_%s = Py_None;\n"
"}"
% (self.name, self.name, self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
argtypes.matcher.register_reverse('GObject*', GObjectParam)
class GObjectReturn(ReturnType):
supports_optional = True
def get_c_type(self):
return self.props.get('c_type', 'GObject *')
def write_decl(self):
if not self.props.get('optional'):
self.wrapper.add_declaration("%s retval;" % self.get_c_type())
else:
self.wrapper.add_declaration("%s retval = NULL;" % self.get_c_type())
def write_error_return(self):
self.wrapper.write_code("return NULL;")
def write_conversion(self):
if not self.props.get('optional'):
self.wrapper.write_code(
code=None,
failure_expression="!PyObject_TypeCheck(py_retval, &PyGObject_Type)",
failure_exception='PyErr_SetString(PyExc_TypeError, "retval should be a GObject");')
self.wrapper.write_code("retval = (%s) pygobject_get(py_retval);"
% self.get_c_type())
self.wrapper.write_code("g_object_ref((GObject *) retval);")
else:
self.wrapper.write_code(
code=None,
failure_expression="py_retval != Py_None && !PyObject_TypeCheck(py_retval, &PyGObject_Type)",
failure_exception='PyErr_SetString(PyExc_TypeError, "retval should be None or a GObject");')
self.wrapper.write_code("if (py_retval != Py_None) {\n"
" retval = (%s) pygobject_get(py_retval);\n"
" g_object_ref((GObject *) retval);\n"
"}\n"
% self.get_c_type())
argtypes.matcher.register_reverse_ret('GObject*', GObjectReturn)
class IntParam(Parameter):
def get_c_type(self):
return self.props.get('c_type', 'int')
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(code=("py_%s = PyInt_FromLong(%s);" %
(self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
class IntReturn(ReturnType):
def get_c_type(self):
return self.props.get('c_type', 'int')
def write_decl(self):
self.wrapper.add_declaration("%s retval;" % self.get_c_type())
def write_error_return(self):
self.wrapper.write_code("return -G_MAXINT;")
def write_conversion(self):
self.wrapper.add_pyret_parse_item("i", "&retval", prepend=True)
for argtype in ('int', 'gint', 'guint', 'short', 'gshort', 'gushort', 'long',
'glong', 'gsize', 'gssize', 'guint8', 'gint8', 'guint16',
'gint16', 'gint32', 'GTime'):
argtypes.matcher.register_reverse(argtype, IntParam)
argtypes.matcher.register_reverse_ret(argtype, IntReturn)
del argtype
class IntPtrParam(Parameter):
def __init__(self, wrapper, name, **props):
if "direction" not in props:
raise argtypes.ArgTypeConfigurationError(
"cannot use int* parameter without direction")
if props["direction"] not in ("out", "inout"):
raise argtypes.ArgTypeConfigurationError(
"cannot use int* parameter with direction '%s'"
% (props["direction"],))
Parameter.__init__(self, wrapper, name, **props)
def get_c_type(self):
return self.props.get('c_type', 'int*')
def convert_c2py(self):
if self.props["direction"] == "inout":
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(code=("py_%s = PyInt_FromLong(*%s);" %
(self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
self.wrapper.add_pyret_parse_item("i", self.name)
for argtype in ('int*', 'gint*'):
argtypes.matcher.register_reverse(argtype, IntPtrParam)
del argtype
class GEnumReturn(IntReturn):
def write_conversion(self):
self.wrapper.write_code(
code=None,
failure_expression=(
"pyg_enum_get_value(%s, py_retval, (gint *)&retval)"
% (self.props['typecode'],)))
argtypes.matcher.register_reverse_ret("GEnum", GEnumReturn)
class GEnumParam(IntParam):
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(code=("py_%s = pyg_enum_from_gtype(%s, %s);" %
(self.name, self.props['typecode'], self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name),
failure_expression=("!py_%s" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
argtypes.matcher.register_reverse("GEnum", GEnumParam)
class GFlagsReturn(IntReturn):
def write_conversion(self):
self.wrapper.write_code(
code=None,
failure_expression=(
"pyg_flags_get_value(%s, py_retval, (gint *)&retval)" %
self.props['typecode']))
argtypes.matcher.register_reverse_ret("GFlags", GFlagsReturn)
class GFlagsParam(IntParam):
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(code=(
"py_%s = pyg_flags_from_gtype(%s, %s);" %
(self.name, self.props['typecode'], self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name),
failure_expression=("!py_%s" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
argtypes.matcher.register_reverse("GFlags", GFlagsParam)
class GtkTreePathParam(IntParam):
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(code=(
"py_%s = pygtk_tree_path_to_pyobject(%s);" %
(self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name),
failure_expression=("!py_%s" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
argtypes.matcher.register_reverse("GtkTreePath*", GtkTreePathParam)
class GtkTreePathReturn(ReturnType):
def get_c_type(self):
return self.props.get('c_type', 'GtkTreePath *')
def write_decl(self):
self.wrapper.add_declaration("GtkTreePath * retval;")
def write_error_return(self):
self.wrapper.write_code("return NULL;")
def write_conversion(self):
self.wrapper.write_code(
"retval = pygtk_tree_path_from_pyobject(py_retval);\n",
failure_expression=('!retval'),
failure_exception=(
'PyErr_SetString(PyExc_TypeError, "retval should be a GtkTreePath");'))
argtypes.matcher.register_reverse_ret("GtkTreePath*", GtkTreePathReturn)
class BooleanReturn(ReturnType):
def get_c_type(self):
return "gboolean"
def write_decl(self):
self.wrapper.add_declaration("gboolean retval;")
self.wrapper.add_declaration("PyObject *py_main_retval;")
def write_error_return(self):
self.wrapper.write_code("return FALSE;")
def write_conversion(self):
self.wrapper.add_pyret_parse_item("O", "&py_main_retval", prepend=True)
self.wrapper.write_code(
"retval = PyObject_IsTrue(py_main_retval)? TRUE : FALSE;",
code_sink=self.wrapper.post_return_code)
argtypes.matcher.register_reverse_ret("gboolean", BooleanReturn)
class BooleanParam(Parameter):
def get_c_type(self):
return "gboolean"
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code("py_%s = %s? Py_True : Py_False;"
% (self.name, self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
argtypes.matcher.register_reverse("gboolean", BooleanParam)
class DoubleParam(Parameter):
def get_c_type(self):
return self.props.get('c_type', 'gdouble')
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(code=("py_%s = PyFloat_FromDouble(%s);" %
(self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
class DoublePtrParam(Parameter):
def __init__(self, wrapper, name, **props):
if "direction" not in props:
raise argtypes.ArgTypeConfigurationError(
"cannot use double* parameter without direction")
if props["direction"] not in ("out", ): # inout not yet implemented
raise argtypes.ArgTypeConfigurationError(
"cannot use double* parameter with direction '%s'"
% (props["direction"],))
Parameter.__init__(self, wrapper, name, **props)
def get_c_type(self):
return self.props.get('c_type', 'double*')
def convert_c2py(self):
self.wrapper.add_pyret_parse_item("d", self.name)
for argtype in ('double*', 'gdouble*'):
argtypes.matcher.register_reverse(argtype, DoublePtrParam)
del argtype
class DoubleReturn(ReturnType):
def get_c_type(self):
return self.props.get('c_type', 'gdouble')
def write_decl(self):
self.wrapper.add_declaration("%s retval;" % self.get_c_type())
def write_error_return(self):
self.wrapper.write_code("return -G_MAXFLOAT;")
def write_conversion(self):
self.wrapper.add_pyret_parse_item("d", "&retval", prepend=True)
for argtype in ('float', 'double', 'gfloat', 'gdouble'):
argtypes.matcher.register_reverse(argtype, DoubleParam)
argtypes.matcher.register_reverse_ret(argtype, DoubleReturn)
class GBoxedParam(Parameter):
def get_c_type(self):
return self.props.get('c_type').replace('const-', 'const ')
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
ctype = self.get_c_type()
if ctype.startswith('const '):
ctype_no_const = ctype[len('const '):]
self.wrapper.write_code(
code=('py_%s = pyg_boxed_new(%s, (%s) %s, TRUE, TRUE);' %
(self.name, self.props['typecode'],
ctype_no_const, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name))
else:
self.wrapper.write_code(
code=('py_%s = pyg_boxed_new(%s, %s, FALSE, FALSE);' %
(self.name, self.props['typecode'], self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
argtypes.matcher.register_reverse("GBoxed", GBoxedParam)
class GBoxedReturn(ReturnType):
def get_c_type(self):
return self.props.get('c_type')
def write_decl(self):
self.wrapper.add_declaration("%s retval;" % self.get_c_type())
def write_error_return(self):
self.wrapper.write_code("return retval;")
def write_conversion(self):
self.wrapper.write_code(code = None,
failure_expression=("!pyg_boxed_check(py_retval, %s)" %
(self.props['typecode'],)),
failure_exception=(
'PyErr_SetString(PyExc_TypeError, "retval should be a %s");'
% (self.props['typename'],)))
self.wrapper.write_code('retval = pyg_boxed_get(py_retval, %s);' %
self.props['typename'])
argtypes.matcher.register_reverse_ret("GBoxed", GBoxedReturn)
class GdkRegionPtrReturn(GBoxedReturn):
def write_error_return(self):
self.wrapper.write_code("return gdk_region_new();")
def write_conversion(self):
self.props['typecode'] = 'PYGDK_TYPE_REGION'
self.props['typename'] = 'GdkRegion'
super(GdkRegionPtrReturn, self).write_conversion()
argtypes.matcher.register_reverse_ret("GdkRegion*", GdkRegionPtrReturn)
class PangoFontDescriptionReturn(GBoxedReturn):
def write_error_return(self):
self.wrapper.write_code("return pango_font_description_new();")
def write_conversion(self):
self.props['typecode'] = 'PANGO_TYPE_FONT_DESCRIPTION'
self.props['typename'] = 'PangoFontDescription'
super(PangoFontDescriptionReturn, self).write_conversion()
argtypes.matcher.register_reverse_ret("PangoFontDescription*",
PangoFontDescriptionReturn)
class PangoFontMetricsReturn(GBoxedReturn):
def write_error_return(self):
self.wrapper.write_code("return pango_font_metrics_new();")
def write_conversion(self):
self.props['typecode'] = 'PANGO_TYPE_FONT_METRICS'
self.props['typename'] = 'PangoFontMetrics'
super(PangoFontMetricsReturn, self).write_conversion()
argtypes.matcher.register_reverse_ret("PangoFontMetrics*",
PangoFontMetricsReturn)
class PangoLanguageReturn(GBoxedReturn):
def write_error_return(self):
self.wrapper.write_code("return pango_language_from_string(\"\");")
def write_conversion(self):
self.props['typecode'] = 'PANGO_TYPE_LANGUAGE'
self.props['typename'] = 'PangoLanguage'
super(PangoLanguageReturn, self).write_conversion()
argtypes.matcher.register_reverse_ret("PangoLanguage*", PangoLanguageReturn)
class GdkRectanglePtrParam(Parameter):
def get_c_type(self):
return self.props.get('c_type').replace('const-', 'const ')
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(
code=('py_%s = pyg_boxed_new(GDK_TYPE_RECTANGLE, %s, TRUE, TRUE);' %
(self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name))
self.wrapper.add_pyargv_item("py_%s" % self.name)
argtypes.matcher.register_reverse("GdkRectangle*", GdkRectanglePtrParam)
argtypes.matcher.register_reverse('GtkAllocation*', GdkRectanglePtrParam)
class GErrorParam(Parameter):
def get_c_type(self):
return self.props.get('c_type').replace('**', ' **')
def convert_c2py(self):
self.wrapper.write_code(code=None,
failure_expression=("pyg_gerror_exception_check(%s)" % self.name),
code_sink=self.wrapper.check_exception_code)
argtypes.matcher.register_reverse('GError**', GErrorParam)
class PyGObjectMethodParam(Parameter):
def __init__(self, wrapper, name, method_name, **props):
Parameter.__init__(self, wrapper, name, **props)
self.method_name = method_name
def get_c_type(self):
return self.props.get('c_type', 'GObject *')
def convert_c2py(self):
self.wrapper.add_declaration("PyObject *py_%s;" % self.name)
self.wrapper.write_code(code=("py_%s = pygobject_new((GObject *) %s);" %
(self.name, self.name)),
cleanup=("Py_DECREF(py_%s);" % self.name),
failure_expression=("!py_%s" % self.name))
self.wrapper.set_call_target("py_%s" % self.name, self.method_name)
class CallbackInUserDataParam(Parameter):
def __init__(self, wrapper, name, free_it, **props):
Parameter.__init__(self, wrapper, name, **props)
self.free_it = free_it
def get_c_type(self):
return "gpointer"
def convert_c2py(self):
self.wrapper.add_declaration("PyObject **_user_data;")
cleanup = self.free_it and ("g_free(%s);" % self.name) or None
self.wrapper.write_code(code=("_real_user_data = (PyObject **) %s;"
% self.name),
cleanup=cleanup)
self.wrapper.add_declaration("PyObject *py_func;")
cleanup = self.free_it and "Py_DECREF(py_func);" or None
self.wrapper.write_code(code="py_func = _user_data[0];",
cleanup=cleanup)
self.wrapper.set_call_target("py_func")
self.wrapper.add_declaration("PyObject *py_user_data;")
cleanup = self.free_it and "Py_XDECREF(py_user_data);" or None
self.wrapper.write_code(code="py_user_data = _user_data[1];",
cleanup=cleanup)
self.wrapper.add_pyargv_item("py_user_data", optional=True)
def _test():
import sys
if 1:
wrapper = ReverseWrapper("this_is_the_c_function_name", is_static=True)
wrapper.set_return_type(StringReturn(wrapper))
wrapper.add_parameter(PyGObjectMethodParam(wrapper, "self", method_name="do_xxx"))
wrapper.add_parameter(StringParam(wrapper, "param2", optional=True))
wrapper.add_parameter(GObjectParam(wrapper, "param3"))
#wrapper.add_parameter(InoutIntParam(wrapper, "param4"))
wrapper.generate(FileCodeSink(sys.stderr))
if 0:
wrapper = ReverseWrapper("this_a_callback_wrapper")
wrapper.set_return_type(VoidReturn(wrapper))
wrapper.add_parameter(StringParam(wrapper, "param1", optional=False))
wrapper.add_parameter(GObjectParam(wrapper, "param2"))
wrapper.add_parameter(CallbackInUserDataParam(wrapper, "data", free_it=True))
wrapper.generate(FileCodeSink(sys.stderr))
if __name__ == '__main__':
_test()
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