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base.go
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base.go
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// Copyright 2011 Julian Phillips. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package py
// #include "utils.h"
// static inline void decref(PyObject *obj) { Py_DECREF(obj); }
import "C"
import "unsafe"
// *BaseObject is the concrete representation of the Python "Object *". It is
// used less than in the C API, as the Object interface is mostly used when the
// type is not fixed. Any Object "o" can be turned into a *BaseObject using the
// Base() method (i.e. o.Base() returns a *BaseObject that refers to the same
// underlying Python object as "o"). This allows the Python functions that
// accept any type of object to be defined as methods on *BaseObject.
type BaseObject struct {
AbstractObject
o C.PyObject
}
// BaseType is the Type object that represents the BaseObject type.
var BaseType = (*Type)(unsafe.Pointer(C.getBasePyType(C.GoPyBaseObject_Type)))
func newBaseObject(obj *C.PyObject) *BaseObject {
return (*BaseObject)(unsafe.Pointer(obj))
}
// HasAttr returns true if "obj" has the attribute "name". This is equivalent
// to the Python "hasattr(obj, name)".
func (obj *BaseObject) HasAttr(name Object) bool {
ret := C.PyObject_HasAttr(c(obj), c(name))
if ret == 1 {
return true
}
return false
}
// HasAttrString returns true if "obj" has the attribute "name". This is
// equivalent to the Python "hasattr(obj, name)".
func (obj *BaseObject) HasAttrString(name string) bool {
s := C.CString(name)
defer C.free(unsafe.Pointer(s))
ret := C.PyObject_HasAttrString(c(obj), s)
if ret == 1 {
return true
}
return false
}
// GetAttr returns the attribute of "obj" with the name "name". This is
// equivalent to the Python "obj.name".
//
// Return value: New Reference.
func (obj *BaseObject) GetAttr(name Object) (Object, error) {
ret := C.PyObject_GetAttr(c(obj), c(name))
return obj2ObjErr(ret)
}
// GetAttrString returns the attribute of "obj" with the name "name". This is
// equivalent to the Python "obj.name".
//
// Return value: New Reference.
func (obj *BaseObject) GetAttrString(name string) (Object, error) {
s := C.CString(name)
defer C.free(unsafe.Pointer(s))
ret := C.PyObject_GetAttrString(c(obj), s)
return obj2ObjErr(ret)
}
// PyObject_GenericGetAttr : This is an internal helper function - we shouldn't
// need to expose it ...
// SetAttr sets the attribute of "obj" with the name "name" to "value". This is
// equivalent to the Python "obj.name = value".
func (obj *BaseObject) SetAttr(name, value Object) error {
ret := C.PyObject_SetAttr(c(obj), c(name), c(value))
return int2Err(ret)
}
// SetAttrString sets the attribute of "obj" with the name "name" to "value".
// This is equivalent to the Python "obj.name = value".
func (obj *BaseObject) SetAttrString(name string, value Object) error {
s := C.CString(name)
defer C.free(unsafe.Pointer(s))
ret := C.PyObject_SetAttrString(c(obj), s, c(value))
return int2Err(ret)
}
// PyObject_GenericSetAttr : This is an internal helper function - we shouldn't
// need to expose it ...
// DelAttr deletes the attribute with the name "name" from "obj". This is
// equivalent to the Python "del obj.name".
func (obj *BaseObject) DelAttr(name Object) error {
ret := C.PyObject_SetAttr(c(obj), c(name), nil)
return int2Err(ret)
}
// DelAttrString deletes the attribute with the name "name" from "obj". This is
// equivalent to the Python "del obj.name".
func (obj *BaseObject) DelAttrString(name string) error {
s := C.CString(name)
defer C.free(unsafe.Pointer(s))
ret := C.PyObject_SetAttrString(c(obj), s, nil)
return int2Err(ret)
}
// RichCompare compares "obj" with "obj2" using the specified operation (LE, GE
// etc.), and returns the result. The equivalent Python is "obj op obj2", where
// op is the corresponding Python operator for op.
//
// Return value: New Reference.
func (obj *BaseObject) RichCompare(obj2 Object, op Op) (Object, error) {
ret := C.PyObject_RichCompare(c(obj), c(obj2), C.int(op))
return obj2ObjErr(ret)
}
// RichCompare compares "obj" with "obj2" using the specified operation (LE, GE
// etc.), and returns true or false. The equivalent Python is "obj op obj2",
// where op is the corresponding Python operator for op.
func (obj *BaseObject) RichCompareBool(obj2 Object, op Op) (bool, error) {
ret := C.PyObject_RichCompareBool(c(obj), c(obj2), C.int(op))
return int2BoolErr(ret)
}
// Repr returns a String representation of "obj". This is equivalent to the
// Python "repr(obj)".
//
// Return value: New Reference.
func (obj *BaseObject) Repr() (Object, error) {
ret := C.PyObject_Repr(c(obj))
return obj2ObjErr(ret)
}
// Str returns a String representation of "obj". This is equivalent to the
// Python "str(obj)".
//
// Return value: New Reference.
func (obj *BaseObject) Str() (Object, error) {
ret := C.PyObject_Str(c(obj))
return obj2ObjErr(ret)
}
// Bytes returns a Bytes representation of "obj". This is equivalent to the
// Python "bytes(obj)". In Python 2.x this method is identical to Str().
//
// Return value: New Reference.
func (obj *BaseObject) Bytes() (Object, error) {
ret := C.PyObject_Bytes(c(obj))
return obj2ObjErr(ret)
}
// PyObject_Unicode : TODO
// IsInstance returns true if "obj" is an instance of "cls", false otherwise.
// If "cls" is a Type instead of a class, then true will be return if "obj" is
// of that type. If "cls" is a Tuple then true will be returned if "obj" is an
// instance of any of the Objects in the tuple. This is equivalent to the
// Python "isinstance(obj, cls)".
func (obj *BaseObject) IsInstance(cls Object) (bool, error) {
ret := C.PyObject_IsInstance(c(obj), c(cls))
return int2BoolErr(ret)
}
// IsSubclass retuns true if "obj" is a Subclass of "cls", false otherwise. If
// "cls" is a Tuple, then true is returned if "obj" is a Subclass of any member
// of "cls". This is equivalent to the Python "issubclass(obj, cls)".
func (obj *BaseObject) IsSubclass(cls Object) (bool, error) {
ret := C.PyObject_IsSubclass(c(obj), c(cls))
return int2BoolErr(ret)
}
// Call calls obj with the given args and kwds. kwds may be nil, args may not
// (an empty Tuple must be used if no arguments are wanted). Returns the result
// of the call, or an Error on failure. This is equivalent to
// "obj(*args, **kwds)" in Python.
//
// Return value: New Reference.
func (obj *BaseObject) Call(args *Tuple, kwds *Dict) (Object, error) {
ret := C.PyObject_Call(c(obj), c(args), c(kwds))
return obj2ObjErr(ret)
}
// CallObject calls obj with the given args. args may be nil. Returns the
// result of the call, or an Error on failure. This is equivalent to
// "obj(*args)" in Python.
//
// Return value: New Reference.
func (obj *BaseObject) CallObject(args *Tuple) (Object, error) {
var a *C.PyObject = nil
if args != nil {
a = c(args)
}
ret := C.PyObject_CallObject(c(obj), a)
return obj2ObjErr(ret)
}
func (obj *BaseObject) CallFunctionObjArgs(args ...Object) (Object, error) {
t, err := PackTuple(args...)
if err != nil {
return nil, err
}
defer t.Decref()
return obj.CallObject(t)
}
func (obj *BaseObject) CallMethodObjArgs(name string, args ...Object) (Object, error) {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
f := C.PyObject_GetAttrString(c(obj), cname)
if f == nil {
return nil, AttributeError.Err(name)
}
defer C.decref(f)
if C.PyCallable_Check(f) == 0 {
return nil, TypeError.Err("attribute of type '%s' is not callable", name)
}
t, err := PackTuple(args...)
if err != nil {
return nil, err
}
defer t.Decref()
ret := C.PyObject_CallObject(f, c(t))
return obj2ObjErr(ret)
}
// PyObject_Hash : TODO
// PyObject_HashNotImplement : This is an internal function, that we probably
// don't need to export.
// PyObject_IsTrue : Implemented on AbstractObject
// PyObject_Not : Implemented on AbstractObject
// PyObject_Type : Implemented on AbstractObject
// PyObject_TypeCheck : TODO
// Length returns the length of the Object. This is equivalent to the Python
// "len(obj)".
func (obj *BaseObject) Length() (int64, error) {
ret := C.PyObject_Length(c(obj))
return int64(ret), exception()
}
// Size returns the length of the Object. This is equivalent to the Python
// "len(obj)".
func (obj *BaseObject) Size() (int64, error) {
ret := C.PyObject_Size(c(obj))
return int64(ret), exception()
}
// GetItem returns the element of "obj" corresponding to "key". This is
// equivalent to the Python "obj[key]".
//
// Return value: New Reference.
func (obj *BaseObject) GetItem(key Object) (Object, error) {
ret := C.PyObject_GetItem(c(obj), c(key))
return obj2ObjErr(ret)
}
// SetItem sets the element of "obj" corresponding to "key" to "value". This is
// equivalent to the Python "obj[key] = value".
func (obj *BaseObject) SetItem(key, value Object) error {
ret := C.PyObject_SetItem(c(obj), c(key), c(value))
return int2Err(ret)
}
// DelItem deletes the element from "obj" that corresponds to "key". This is
// equivalent to the Python "del obj[key]".
func (obj *BaseObject) DelItem(key Object) error {
ret := C.PyObject_DelItem(c(obj), c(key))
return int2Err(ret)
}
// PyObject_AsFileDescriptor : TODO
func (obj *BaseObject) Dir() (Object, error) {
ret := C.PyObject_Dir(c(obj))
return obj2ObjErr(ret)
}
// PyObject_GetIter : TODO