rust/hg-cpython/src/exceptions.rs
author Rapha?l Gom?s <rgomes@octobus.net>
Fri, 17 May 2019 09:36:29 -0400
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parent 41349 ee943a920606
child 42557 d26e4a434fe5
permissions -rw-r--r--
rust-filepatterns: add `rust-cpython` bindings for `filepatterns` This change adds the `rust-cpython` interface for top-level functions and exceptions in the filepatterns module. Contrary to the Python implementation, this tries to have finer-grained exceptions to allow for better readability and flow control down the line. Differential Revision: https://phab.mercurial-scm.org/D6272
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// ancestors.rs
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//
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// Copyright 2018 Georges Racinet <gracinet@anybox.fr>
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//
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// This software may be used and distributed according to the terms of the
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// GNU General Public License version 2 or any later version.
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//! Bindings for Rust errors
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//!
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//! [`GraphError`] exposes `hg::GraphError` as a subclass of `ValueError`
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//! but some variants of `hg::GraphError` can be converted directly to other
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//! existing Python exceptions if appropriate.
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//!
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//! [`GraphError`]: struct.GraphError.html
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use cpython::exc::{ValueError, RuntimeError};
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use cpython::{PyErr, Python, exc};
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use hg;
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py_exception!(rustext, GraphError, ValueError);
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impl GraphError {
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    pub fn pynew(py: Python, inner: hg::GraphError) -> PyErr {
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        match inner {
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            hg::GraphError::ParentOutOfRange(r) => {
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                GraphError::new(py, ("ParentOutOfRange", r))
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            }
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            hg::GraphError::WorkingDirectoryUnsupported => {
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                match py
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                    .import("mercurial.error")
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                    .and_then(|m| m.get(py, "WdirUnsupported"))
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                    {
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                        Err(e) => e,
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                        Ok(cls) => PyErr::from_instance(py, cls),
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                    }
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            }
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        }
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    }
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}
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py_exception!(rustext, PatternError, RuntimeError);
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py_exception!(rustext, PatternFileError, RuntimeError);
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impl PatternError {
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    pub fn pynew(py: Python, inner: hg::PatternError) -> PyErr {
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        match inner {
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            hg::PatternError::UnsupportedSyntax(m) => {
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                PatternError::new(py, ("PatternError", m))
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            }
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        }
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    }
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}
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impl PatternFileError {
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    pub fn pynew(py: Python, inner: hg::PatternFileError) -> PyErr {
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        match inner {
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            hg::PatternFileError::IO(e) => {
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                let value = (
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                    e.raw_os_error().unwrap_or(2),
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                    e.to_string()
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                );
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                PyErr::new::<exc::IOError, _>(py, value)
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            }
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            hg::PatternFileError::Pattern(e, l) => {
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                match e {
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                    hg::PatternError::UnsupportedSyntax(m) =>
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                        PatternFileError::new(py, ("PatternFileError", m, l))
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                }
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            }
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        }
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    }
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}