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annotate rust/hg-cpython/src/conversion.rs @ 44203:2a24ead003f0

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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 33fe96a5c522
children c7fb9b74e753
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1 // conversion.rs
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2 //
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3 // Copyright 2019 Georges Racinet <georges.racinet@octobus.net>
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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 the hg::ancestors module provided by the
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9 //! `hg-core` crate. From Python, this will be seen as `rustext.ancestor`
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11 use cpython::{ObjectProtocol, PyObject, PyResult, Python};
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12 use hg::Revision;
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13 use std::iter::FromIterator;
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14
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15 /// Utility function to convert a Python iterable into various collections
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16 ///
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17 /// We need this in particular to feed to various methods of inner objects
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18 /// with `impl IntoIterator<Item=Revision>` arguments, because
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19 /// a `PyErr` can arise at each step of iteration, whereas these methods
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20 /// expect iterables over `Revision`, not over some `Result<Revision, PyErr>`
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21 pub fn rev_pyiter_collect<C>(py: Python, revs: &PyObject) -> PyResult<C>
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22 where
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23 C: FromIterator<Revision>,
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24 {
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25 revs.iter(py)?
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26 .map(|r| r.and_then(|o| o.extract::<Revision>(py)))
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27 .collect()
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28 }