pyo3/tests/test_mapping.rs

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use std::collections::HashMap;
use pyo3::exceptions::PyKeyError;
use pyo3::prelude::*;
use pyo3::types::IntoPyDict;
use pyo3::types::PyList;
use pyo3::PyMappingProtocol;
#[pyclass]
struct Mapping {
index: HashMap<String, usize>,
}
#[pymethods]
impl Mapping {
#[new]
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fn new(elements: Option<&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 = String::extract(pyelem)?;
elems.insert(elem, i);
}
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Ok(Self { index: elems })
} else {
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Ok(Self {
index: HashMap::new(),
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})
}
}
}
#[pyproto]
impl PyMappingProtocol for Mapping {
fn __len__(&self) -> usize {
self.index.len()
}
fn __getitem__(&self, query: String) -> PyResult<usize> {
self.index
.get(&query)
.copied()
.ok_or_else(|| PyKeyError::py_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() {
PyKeyError::py_err("unknown key").into()
} else {
Ok(())
}
}
/// not an actual reversed implementation, just to demonstrate that the method is callable.
fn __reversed__(&self) -> PyObject {
let gil = Python::acquire_gil();
self.index
.keys()
.cloned()
.collect::<Vec<String>>()
.into_py(gil.python())
}
}
#[test]
fn test_getitem() {
let gil = Python::acquire_gil();
let py = gil.python();
let d = [("Mapping", py.get_type::<Mapping>())].into_py_dict(py);
let run = |code| py.run(code, None, Some(d)).unwrap();
let err = |code| py.run(code, None, Some(d)).unwrap_err();
run("m = Mapping(['1', '2', '3']); assert m['1'] == 0");
run("m = Mapping(['1', '2', '3']); assert m['2'] == 1");
run("m = Mapping(['1', '2', '3']); assert m['3'] == 2");
err("m = Mapping(['1', '2', '3']); print(m['4'])");
}
#[test]
fn test_setitem() {
let gil = Python::acquire_gil();
let py = gil.python();
let d = [("Mapping", py.get_type::<Mapping>())].into_py_dict(py);
let run = |code| py.run(code, None, Some(d)).unwrap();
let err = |code| py.run(code, None, Some(d)).unwrap_err();
run("m = Mapping(['1', '2', '3']); m['1'] = 4; assert m['1'] == 4");
run("m = Mapping(['1', '2', '3']); m['0'] = 0; assert m['0'] == 0");
run("m = Mapping(['1', '2', '3']); len(m) == 4");
err("m = Mapping(['1', '2', '3']); m[0] = 'hello'");
err("m = Mapping(['1', '2', '3']); m[0] = -1");
}
#[test]
fn test_delitem() {
let gil = Python::acquire_gil();
let py = gil.python();
let d = [("Mapping", py.get_type::<Mapping>())].into_py_dict(py);
let run = |code| py.run(code, None, Some(d)).unwrap();
let err = |code| py.run(code, None, Some(d)).unwrap_err();
run(
"m = Mapping(['1', '2', '3']); del m['1']; assert len(m) == 2; \
assert m['2'] == 1; assert m['3'] == 2",
);
err("m = Mapping(['1', '2', '3']); del m[-1]");
err("m = Mapping(['1', '2', '3']); del m['4']");
}
#[test]
fn test_reversed() {
let gil = Python::acquire_gil();
let py = gil.python();
let d = [("Mapping", py.get_type::<Mapping>())].into_py_dict(py);
let run = |code| py.run(code, None, Some(d)).unwrap();
run("m = Mapping(['1', '2']); assert set(reversed(m)) == {'1', '2'}");
}