nautilus_core/python/
enums.rs

1// -------------------------------------------------------------------------------------------------
2//  Copyright (C) 2015-2025 Posei Systems Pty Ltd. All rights reserved.
3//  https://poseitrader.io
4//
5//  Licensed under the GNU Lesser General Public License Version 3.0 (the "License");
6//  You may not use this file except in compliance with the License.
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8//
9//  Unless required by applicable law or agreed to in writing, software
10//  distributed under the License is distributed on an "AS IS" BASIS,
11//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12//  See the License for the specific language governing permissions and
13//  limitations under the License.
14// -------------------------------------------------------------------------------------------------
15
16//! Macro-generated enum utilities for PyO3.
17
18use ::pyo3::exceptions::PyValueError;
19use ::strum::{IntoEnumIterator, ParseError};
20use pyo3::PyResult;
21
22/// Converts a raw string to the enum `E`, returning a nicely‑formatted
23/// `PyValueError` if the string does not match any variant.
24///
25/// The helper is aimed at Python‑exposed functions that still accept plain
26/// `&str` parameters internally: call `parse_enum` instead of writing repetitive
27/// `str::parse()` + error‑formatting logic yourself.
28///
29/// # Errors
30///
31/// Returns an error if `input` does not match any known variant of `E`.
32pub fn parse_enum<E>(input: &str, param: &str) -> PyResult<E>
33where
34    E: std::str::FromStr<Err = ParseError> + IntoEnumIterator + ToString,
35{
36    input.parse::<E>().map_err(|_| {
37        let allowed = E::iter()
38            .map(|v| v.to_string())
39            .collect::<Vec<_>>()
40            .join(", ");
41        PyValueError::new_err(format!(
42            "unknown {param} `{input}`; valid values: {allowed}"
43        ))
44    })
45}
nautilus_core/python/enums.rs

nautilus_core/python/
enums.rs
