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annotate rust/hg-cpython/src/exceptions.rs @ 44278:2a24ead003f0

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rust-cpython: add panicking version of borrow_mut() and use it The original borrow_mut() is renamed to try_borrow_mut(). Since leak_immutable() no longer incref the borrow count, the caller should know if the underlying value is borrowed or not. No Python world is involved. That's why we can simply use the panicking borrow_mut().
author Yuya Nishihara <yuya@tcha.org>
date Sat, 12 Oct 2019 23:34:05 +0900
parents 3bd77c64bc74
children 9804badd5970
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1 // ancestors.rs
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2 //
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3 // Copyright 2018 Georges Racinet <gracinet@anybox.fr>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 //! Bindings for Rust errors
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9 //!
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10 //! [`GraphError`] exposes `hg::GraphError` as a subclass of `ValueError`
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11 //! but some variants of `hg::GraphError` can be converted directly to other
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12 //! existing Python exceptions if appropriate.
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13 //!
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14 //! [`GraphError`]: struct.GraphError.html
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15 use cpython::{
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16 exc::{RuntimeError, ValueError},
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17 py_exception, PyErr, Python,
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18 };
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19 use hg;
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20
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21 py_exception!(rustext, GraphError, ValueError);
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22
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23 impl GraphError {
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24 pub fn pynew(py: Python, inner: hg::GraphError) -> PyErr {
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25 match inner {
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26 hg::GraphError::ParentOutOfRange(r) => {
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27 GraphError::new(py, ("ParentOutOfRange", r))
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28 }
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29 hg::GraphError::WorkingDirectoryUnsupported => {
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30 match py
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31 .import("mercurial.error")
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32 .and_then(|m| m.get(py, "WdirUnsupported"))
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33 {
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34 Err(e) => e,
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35 Ok(cls) => PyErr::from_instance(py, cls),
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36 }
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37 }
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38 }
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39 }
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40 }
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41
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42 py_exception!(rustext, HgPathPyError, RuntimeError);
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43
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44 py_exception!(shared_ref, AlreadyBorrowed, RuntimeError);