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use std::collections::HashMap;
use pyo3::{
exceptions::{PyIndexError, PyKeyError},
prelude::*,
types::{PyDict, PyList, PyMapping, PySequence},
};
use pythonize::{
depythonize_bound, pythonize_custom, PythonizeDictType, PythonizeListType, PythonizeTypes,
Pythonizer,
};
use serde::Serialize;
use serde_json::{json, Value};
#[pyclass(sequence)]
struct CustomList {
items: Vec<PyObject>,
}
#[pymethods]
impl CustomList {
fn __len__(&self) -> usize {
self.items.len()
}
fn __getitem__(&self, idx: isize) -> PyResult<PyObject> {
self.items
.get(idx as usize)
.cloned()
.ok_or_else(|| PyIndexError::new_err(idx))
}
}
impl PythonizeListType for CustomList {
fn create_sequence<T, U>(
py: Python,
elements: impl IntoIterator<Item = T, IntoIter = U>,
) -> PyResult<Bound<PySequence>>
where
T: ToPyObject,
U: ExactSizeIterator<Item = T>,
{
let sequence = Bound::new(
py,
CustomList {
items: elements
.into_iter()
.map(|item| item.to_object(py))
.collect(),
},
)?
.into_any();
Ok(unsafe { sequence.downcast_into_unchecked() })
}
}
struct PythonizeCustomList;
impl PythonizeTypes for PythonizeCustomList {
type Map = PyDict;
type List = CustomList;
}
#[test]
fn test_custom_list() {
Python::with_gil(|py| {
PySequence::register::<CustomList>(py).unwrap();
let serialized = pythonize_custom::<PythonizeCustomList, _>(py, &json!([1, 2, 3]))
.unwrap()
.into_bound(py);
assert!(serialized.is_instance_of::<CustomList>());
let deserialized: Value = depythonize_bound(serialized).unwrap();
assert_eq!(deserialized, json!([1, 2, 3]));
})
}
#[pyclass(mapping)]
struct CustomDict {
items: HashMap<String, PyObject>,
}
#[pymethods]
impl CustomDict {
fn __len__(&self) -> usize {
self.items.len()
}
fn __getitem__(&self, key: String) -> PyResult<PyObject> {
self.items
.get(&key)
.cloned()
.ok_or_else(|| PyKeyError::new_err(key))
}
fn __setitem__(&mut self, key: String, value: PyObject) {
self.items.insert(key, value);
}
fn keys(&self) -> Vec<&String> {
self.items.keys().collect()
}
fn values(&self) -> Vec<PyObject> {
self.items.values().cloned().collect()
}
}
impl PythonizeDictType for CustomDict {
fn create_mapping(py: Python) -> PyResult<Bound<PyMapping>> {
let mapping = Bound::new(
py,
CustomDict {
items: HashMap::new(),
},
)?
.into_any();
Ok(unsafe { mapping.downcast_into_unchecked() })
}
}
struct PythonizeCustomDict;
impl PythonizeTypes for PythonizeCustomDict {
type Map = CustomDict;
type List = PyList;
}
#[test]
fn test_custom_dict() {
Python::with_gil(|py| {
PyMapping::register::<CustomDict>(py).unwrap();
let serialized =
pythonize_custom::<PythonizeCustomDict, _>(py, &json!({ "hello": 1, "world": 2 }))
.unwrap()
.into_bound(py);
assert!(serialized.is_instance_of::<CustomDict>());
let deserialized: Value = depythonize_bound(serialized).unwrap();
assert_eq!(deserialized, json!({ "hello": 1, "world": 2 }));
})
}
#[test]
fn test_pythonizer_can_be_created() {
// https://github.com/davidhewitt/pythonize/pull/56
Python::with_gil(|py| {
let sample = json!({ "hello": 1, "world": 2 });
assert!(sample
.serialize(Pythonizer::new(py))
.unwrap()
.bind(py)
.is_instance_of::<PyDict>());
assert!(sample
.serialize(Pythonizer::custom::<PythonizeCustomDict>(py))
.unwrap()
.bind(py)
.is_instance_of::<CustomDict>());
})
}
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