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
// Copyright (c) 2017-present PyO3 Project and Contributors
//
// based on Daniel Grunwald's https://github.com/dgrunwald/rust-cpython
use std;
use std::ffi::{CStr, CString};
use std::os::raw::c_char;
use conversion::{IntoPyTuple, ToPyObject};
use err::{PyErr, PyResult};
use ffi;
use instance::PyObjectWithToken;
use object::PyObject;
use objectprotocol::ObjectProtocol;
use objects::{exc, PyDict, PyObjectRef, PyType};
use python::{IntoPyDictPointer, Python, ToPyPointer};
use typeob::{initialize_type, PyTypeInfo};
/// Represents a Python `module` object.
#[repr(transparent)]
pub struct PyModule(PyObject);
pyobject_native_type!(PyModule, ffi::PyModule_Type, ffi::PyModule_Check);
impl PyModule {
/// Create a new module object with the `__name__` attribute set to name.
pub fn new<'p>(py: Python<'p>, name: &str) -> PyResult<&'p PyModule> {
let name = CString::new(name)?;
unsafe { py.from_owned_ptr_or_err(ffi::PyModule_New(name.as_ptr())) }
}
/// Import the Python module with the specified name.
pub fn import<'p>(py: Python<'p>, name: &str) -> PyResult<&'p PyModule> {
let name = CString::new(name)?;
unsafe { py.from_owned_ptr_or_err(ffi::PyImport_ImportModule(name.as_ptr())) }
}
/// Loads the python code specified into a new module
/// 'code' is the raw Python you want to load into the module
/// 'file_name' is the file name to associate with the module
/// (this is used when Python reports errors, for example)
/// 'module_name' is the name to give the module
#[cfg(Py_3)]
pub fn from_code<'p>(
py: Python<'p>,
code: &str,
file_name: &str,
module_name: &str,
) -> PyResult<&'p PyModule> {
let data = CString::new(code)?;
let filename = CString::new(file_name)?.as_ptr();
let module = CString::new(module_name)?;
unsafe {
let cptr = ffi::Py_CompileString(data.as_ptr(), filename, ffi::Py_file_input);
if cptr.is_null() {
return Err(PyErr::fetch(py));
}
let mptr = ffi::PyImport_ExecCodeModuleEx(module.as_ptr(), cptr, filename);
if mptr.is_null() {
return Err(PyErr::fetch(py));
}
<&PyModule as ::conversion::FromPyObject>::extract(py.from_owned_ptr_or_err(mptr)?)
}
}
/// Return the dictionary object that implements module's namespace;
/// this object is the same as the `__dict__` attribute of the module object.
pub fn dict(&self) -> &PyDict {
unsafe {
self.py()
.from_owned_ptr::<PyDict>(ffi::PyModule_GetDict(self.as_ptr()))
}
}
unsafe fn str_from_ptr(&self, ptr: *const c_char) -> PyResult<&str> {
if ptr.is_null() {
Err(PyErr::fetch(self.py()))
} else {
let slice = CStr::from_ptr(ptr).to_bytes();
match std::str::from_utf8(slice) {
Ok(s) => Ok(s),
Err(e) => Err(PyErr::from_instance(exc::UnicodeDecodeError::new_utf8(
self.py(),
slice,
e,
)?)),
}
}
}
/// Gets the module name.
///
/// May fail if the module does not have a `__name__` attribute.
pub fn name(&self) -> PyResult<&str> {
unsafe { self.str_from_ptr(ffi::PyModule_GetName(self.as_ptr())) }
}
/// Gets the module filename.
///
/// May fail if the module does not have a `__file__` attribute.
pub fn filename(&self) -> PyResult<&str> {
unsafe { self.str_from_ptr(ffi::PyModule_GetFilename(self.as_ptr())) }
}
/// Calls a function in the module.
/// This is equivalent to the Python expression: `getattr(module, name)(*args, **kwargs)`
pub fn call<A, K>(&self, name: &str, args: A, kwargs: K) -> PyResult<&PyObjectRef>
where
A: IntoPyTuple,
K: IntoPyDictPointer,
{
self.getattr(name)?.call(args, kwargs)
}
/// Calls a function in the module.
/// This is equivalent to the Python expression: `getattr(module, name)()`
pub fn call0(&self, name: &str) -> PyResult<&PyObjectRef> {
self.getattr(name)?.call0()
}
/// Calls a function in the module.
/// This is equivalent to the Python expression: `getattr(module, name)(*args)`
pub fn call1<A>(&self, name: &str, args: A) -> PyResult<&PyObjectRef>
where
A: IntoPyTuple,
{
self.getattr(name)?.call1(args)
}
/// Gets a member from the module.
/// This is equivalent to the Python expression: `getattr(module, name)`
pub fn get(&self, name: &str) -> PyResult<&PyObjectRef> {
self.getattr(name)
}
/// Adds a member to the module.
///
/// This is a convenience function which can be used from the module's initialization function.
pub fn add<V>(&self, name: &str, value: V) -> PyResult<()>
where
V: ToPyObject,
{
self.setattr(name, value)
}
/// Adds a new extension type to the module.
///
/// This is a convenience function that initializes the `class`,
/// sets `new_type.__module__` to this module's name,
/// and adds the type to this module.
pub fn add_class<T>(&self) -> PyResult<()>
where
T: PyTypeInfo,
{
let ty = unsafe {
let ty = <T as PyTypeInfo>::type_object();
if ((*ty).tp_flags & ffi::Py_TPFLAGS_READY) != 0 {
PyType::new::<T>()
} else {
// automatically initialize the class
initialize_type::<T>(self.py(), Some(self.name()?)).expect(
format!("An error occurred while initializing class {}", T::NAME).as_ref(),
);
PyType::new::<T>()
}
};
self.setattr(T::NAME, ty)
}
/// Adds a function to a module, using the functions __name__ as name.
///
/// Use this together with the`#[pyfunction]` and [wrap_function!] macro.
///
/// ```rust,ignore
/// m.add_function(wrap_function!(double));
/// ```
///
/// You can also add a function with a custom name using [add](PyModule::add):
///
/// ```rust,ignore
/// m.add("also_double", wrap_function!(double)(py));
/// ```
pub fn add_function(&self, wrapper: &Fn(Python) -> PyObject) -> PyResult<()> {
let function = wrapper(self.py());
let name = function
.getattr(self.py(), "__name__")
.expect("A function must have a __name__");
self.add(name.extract(self.py()).unwrap(), function)
}
}