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// Copyright (c) 2017-present PyO3 Project and Contributors
//
// based on Daniel Grunwald's https://github.com/dgrunwald/rust-cpython
use std;
use std::os::raw::c_char;
use std::ffi::{CStr, CString};
use ffi;
use typeob::{PyTypeInfo, initialize_type};
use conversion::{ToPyObject, IntoPyTuple};
use object::PyObject;
use python::{Python, ToPyPointer, IntoPyDictPointer};
use objects::{PyObjectRef, PyDict, PyType, exc};
use objectprotocol::ObjectProtocol;
use instance::PyObjectWithToken;
use err::{PyResult, PyErr};
/// Represents a Python `module` object.
pub struct PyModule(PyObject);
pyobject_convert!(PyModule);
pyobject_nativetype!(PyModule, PyModule_Type, 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()))
}
}
/// 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)
}
}