1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
use python::{Python, PythonObject, ToPythonPointer, PyDrop};
use err::{self, PyErr, PyResult};
use super::object::PyObject;
use super::exc;
use ffi::{self, Py_ssize_t};
use conversion::{FromPyObject, ToPyObject};
use std::slice;
pub struct PyTuple(PyObject);
pyobject_newtype!(PyTuple, PyTuple_Check, PyTuple_Type);
impl PyTuple {
pub fn new(py: Python, elements: &[PyObject]) -> PyTuple {
unsafe {
let len = elements.len();
let ptr = ffi::PyTuple_New(len as Py_ssize_t);
let t = err::result_cast_from_owned_ptr::<PyTuple>(py, ptr).unwrap();
for (i, e) in elements.iter().enumerate() {
ffi::PyTuple_SetItem(ptr, i as Py_ssize_t, e.steal_ptr(py));
}
t
}
}
pub fn empty(py: Python) -> PyTuple {
unsafe {
err::result_cast_from_owned_ptr::<PyTuple>(py, ffi::PyTuple_New(0)).unwrap()
}
}
#[inline]
pub fn len(&self, _py: Python) -> usize {
unsafe {
ffi::PyTuple_GET_SIZE(self.0.as_ptr()) as usize
}
}
pub fn get_item(&self, py: Python, index: usize) -> PyObject {
assert!(index < self.len(py));
unsafe {
PyObject::from_borrowed_ptr(py, ffi::PyTuple_GET_ITEM(self.0.as_ptr(), index as Py_ssize_t))
}
}
#[inline]
pub fn as_slice<'a>(&'a self, py: Python) -> &'a [PyObject] {
unsafe {
let ptr = self.0.as_ptr() as *mut ffi::PyTupleObject;
PyObject::borrow_from_owned_ptr_slice(
slice::from_raw_parts(
(*ptr).ob_item.as_ptr(),
self.len(py)
))
}
}
#[inline]
pub fn iter(&self, py: Python) -> slice::Iter<PyObject> {
self.as_slice(py).iter()
}
}
fn wrong_tuple_length(py: Python, t: &PyTuple, expected_length: usize) -> PyErr {
let msg = format!("Expected tuple of length {}, but got tuple of length {}.", expected_length, t.len(py));
PyErr::new_lazy_init(py.get_type::<exc::ValueError>(), Some(msg.to_py_object(py).into_object()))
}
macro_rules! tuple_conversion ({$length:expr,$(($refN:ident, $n:tt, $T:ident)),+} => {
impl <$($T: ToPyObject),+> ToPyObject for ($($T,)+) {
type ObjectType = PyTuple;
fn to_py_object(&self, py: Python) -> PyTuple {
PyTuple::new(py, &[
$(py_coerce_expr!(self.$n.to_py_object(py)).into_object(),)+
])
}
fn into_py_object(self, py: Python) -> PyTuple {
PyTuple::new(py, &[
$(py_coerce_expr!(self.$n.into_py_object(py)).into_object(),)+
])
}
}
impl <'s, $($T: FromPyObject<'s>),+> FromPyObject<'s> for ($($T,)+) {
fn extract(py: Python, obj: &'s PyObject) -> PyResult<Self> {
let t = try!(obj.cast_as::<PyTuple>(py));
let slice = t.as_slice(py);
if slice.len() == $length {
Ok((
$( try!(slice[$n].extract::<$T>(py)), )+
))
} else {
Err(wrong_tuple_length(py, t, $length))
}
}
}
});
tuple_conversion!(1, (ref0, 0, A));
tuple_conversion!(2, (ref0, 0, A), (ref1, 1, B));
tuple_conversion!(3, (ref0, 0, A), (ref1, 1, B), (ref2, 2, C));
tuple_conversion!(4, (ref0, 0, A), (ref1, 1, B), (ref2, 2, C), (ref3, 3, D));
tuple_conversion!(5, (ref0, 0, A), (ref1, 1, B), (ref2, 2, C), (ref3, 3, D),
(ref4, 4, E));
tuple_conversion!(6, (ref0, 0, A), (ref1, 1, B), (ref2, 2, C), (ref3, 3, D),
(ref4, 4, E), (ref5, 5, F));
tuple_conversion!(7, (ref0, 0, A), (ref1, 1, B), (ref2, 2, C), (ref3, 3, D),
(ref4, 4, E), (ref5, 5, F), (ref6, 6, G));
tuple_conversion!(8, (ref0, 0, A), (ref1, 1, B), (ref2, 2, C), (ref3, 3, D),
(ref4, 4, E), (ref5, 5, F), (ref6, 6, G), (ref7, 7, H));
tuple_conversion!(9, (ref0, 0, A), (ref1, 1, B), (ref2, 2, C), (ref3, 3, D),
(ref4, 4, E), (ref5, 5, F), (ref6, 6, G), (ref7, 7, H), (ref8, 8, I));
#[derive(Copy, Clone, Debug)]
pub struct NoArgs;
impl ToPyObject for NoArgs {
type ObjectType = PyTuple;
fn to_py_object(&self, py: Python) -> PyTuple {
PyTuple::empty(py)
}
}
extract!(obj to NoArgs; py => {
let t = try!(obj.cast_as::<PyTuple>(py));
if t.len(py) == 0 {
Ok(NoArgs)
} else {
Err(wrong_tuple_length(py, t, 0))
}
});
#[cfg(test)]
mod test {
use python::{Python, PythonObject};
use conversion::ToPyObject;
#[test]
fn test_len() {
let gil = Python::acquire_gil();
let py = gil.python();
let tuple = (1, 2, 3).to_py_object(py);
assert_eq!(3, tuple.len(py));
assert_eq!((1, 2, 3), tuple.into_object().extract(py).unwrap());
}
}