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#![cfg(feature = "macros")]
use std::collections::HashMap;
use pyo3::exceptions::PyKeyError;
use pyo3::prelude::*;
use pyo3::py_run;
use pyo3::types::IntoPyDict;
use pyo3::types::PyList;
use pyo3::types::PyMapping;
use pyo3::types::PySequence;
mod test_utils;
#[pyclass(mapping)]
struct Mapping {
index: HashMap<String, usize>,
}
#[pymethods]
impl Mapping {
#[new]
#[pyo3(signature=(elements=None))]
fn new(elements: Option<&Bound<'_, PyList>>) -> PyResult<Self> {
if let Some(pylist) = elements {
let mut elems = HashMap::with_capacity(pylist.len());
for (i, pyelem) in pylist.into_iter().enumerate() {
let elem = pyelem.extract()?;
elems.insert(elem, i);
}
Ok(Self { index: elems })
} else {
Ok(Self {
index: HashMap::new(),
})
}
}
fn __len__(&self) -> usize {
self.index.len()
}
fn __getitem__(&self, query: String) -> PyResult<usize> {
self.index
.get(&query)
.copied()
.ok_or_else(|| PyKeyError::new_err("unknown key"))
}
fn __setitem__(&mut self, key: String, value: usize) {
self.index.insert(key, value);
}
fn __delitem__(&mut self, key: String) -> PyResult<()> {
if self.index.remove(&key).is_none() {
Err(PyKeyError::new_err("unknown key"))
} else {
Ok(())
}
}
#[pyo3(signature=(key, default=None))]
fn get(
&self,
py: Python<'_>,
key: &str,
default: Option<Py<PyAny>>,
) -> PyResult<Option<Py<PyAny>>> {
match self.index.get(key) {
Some(value) => Ok(Some(value.into_pyobject(py)?.into_any().unbind())),
None => Ok(default),
}
}
}
/// Return a dict with `m = Mapping(['1', '2', '3'])`.
fn map_dict(py: Python<'_>) -> Bound<'_, pyo3::types::PyDict> {
let d = [("Mapping", py.get_type::<Mapping>())]
.into_py_dict(py)
.unwrap();
py_run!(py, *d, "m = Mapping(['1', '2', '3'])");
d
}
#[test]
fn test_getitem() {
Python::attach(|py| {
let d = map_dict(py);
py_assert!(py, *d, "m['1'] == 0");
py_assert!(py, *d, "m['2'] == 1");
py_assert!(py, *d, "m['3'] == 2");
py_expect_exception!(py, *d, "print(m['4'])", PyKeyError);
});
}
#[test]
fn test_setitem() {
Python::attach(|py| {
let d = map_dict(py);
py_run!(py, *d, "m['1'] = 4; assert m['1'] == 4");
py_run!(py, *d, "m['0'] = 0; assert m['0'] == 0");
py_assert!(py, *d, "len(m) == 4");
py_expect_exception!(py, *d, "m[0] = 'hello'", PyTypeError);
py_expect_exception!(py, *d, "m[0] = -1", PyTypeError);
});
}
#[test]
fn test_delitem() {
Python::attach(|py| {
let d = map_dict(py);
py_run!(
py,
*d,
"del m['1']; assert len(m) == 2 and m['2'] == 1 and m['3'] == 2"
);
py_expect_exception!(py, *d, "del m[-1]", PyTypeError);
py_expect_exception!(py, *d, "del m['4']", PyKeyError);
});
}
#[test]
fn mapping_is_not_sequence() {
Python::attach(|py| {
let mut index = HashMap::new();
index.insert("Foo".into(), 1);
index.insert("Bar".into(), 2);
let m = Py::new(py, Mapping { index }).unwrap();
PyMapping::register::<Mapping>(py).unwrap();
assert!(m.bind(py).cast::<PyMapping>().is_ok());
assert!(m.bind(py).cast::<PySequence>().is_err());
});
}
|
