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