Mercurial > public > mercurial-scm > hg-stable

annotate rust/hg-cpython/src/exceptions.rs @ 42172:c3484ddbdb96 stable 5.0.1

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manifest: add some documentation to _lazymanifest python code It was not particularly easy figuring out the design of this class and keeping track of how the pieces work. So might as well write some of it down for the next person.
author Matt Harbison <matt_harbison@yahoo.com>
date Thu, 23 May 2019 22:50:11 -0400
parents ee943a920606
children 94f3a73b6672
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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::exc::ValueError;
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16 use cpython::{PyErr, Python};
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17 use hg;
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18
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19 py_exception!(rustext, GraphError, ValueError);
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20
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21 impl GraphError {
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22 pub fn pynew(py: Python, inner: hg::GraphError) -> PyErr {
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23 match inner {
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24 hg::GraphError::ParentOutOfRange(r) => {
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25 GraphError::new(py, ("ParentOutOfRange", r))
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26 }
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27 hg::GraphError::WorkingDirectoryUnsupported => {
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28 match py
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29 .import("mercurial.error")
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30 .and_then(|m| m.get(py, "WdirUnsupported"))
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31 {
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32 Err(e) => e,
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33 Ok(cls) => PyErr::from_instance(py, cls),
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34 }
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35 }
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36 }
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37 }
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38 }