view rust/hg-cpython/src/exceptions.rs @ 44011:c627f1b2f3c3

rust-index: handle `MixedIndex` in `pyindex_to_graph`

On the long run we will want to implement the Graph trait directly in Rust, but
for now we take the path with the least amount of change to focus on the coming
persistent NodeMap code.

We test this new code through with the lazy ancestors code.

Differential Revision: https://phab.mercurial-scm.org/D7657

// ancestors.rs
//
// Copyright 2018 Georges Racinet <[e-mail]>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.

//! Bindings for Rust errors
//!
//! [`GraphError`] exposes `hg::GraphError` as a subclass of `ValueError`
//! but some variants of `hg::GraphError` can be converted directly to other
//! existing Python exceptions if appropriate.
//!
//! [`GraphError`]: struct.GraphError.html
use cpython::{
    exc::{IOError, RuntimeError, ValueError},
    py_exception, PyErr, Python,
};
use hg;

py_exception!(rustext, GraphError, ValueError);

impl GraphError {
    pub fn pynew(py: Python, inner: hg::GraphError) -> PyErr {
        match inner {
            hg::GraphError::ParentOutOfRange(r) => {
                GraphError::new(py, ("ParentOutOfRange", r))
            }
            hg::GraphError::WorkingDirectoryUnsupported => {
                match py
                    .import("mercurial.error")
                    .and_then(|m| m.get(py, "WdirUnsupported"))
                {
                    Err(e) => e,
                    Ok(cls) => PyErr::from_instance(py, cls),
                }
            }
        }
    }
}

py_exception!(rustext, PatternError, RuntimeError);
py_exception!(rustext, PatternFileError, RuntimeError);
py_exception!(rustext, HgPathPyError, RuntimeError);

impl PatternError {
    pub fn pynew(py: Python, inner: hg::PatternError) -> PyErr {
        match inner {
            hg::PatternError::UnsupportedSyntax(m) => {
                PatternError::new(py, ("PatternError", m))
            }
        }
    }
}

impl PatternFileError {
    pub fn pynew(py: Python, inner: hg::PatternFileError) -> PyErr {
        match inner {
            hg::PatternFileError::IO(e) => {
                let value = (e.raw_os_error().unwrap_or(2), e.to_string());
                PyErr::new::<IOError, _>(py, value)
            }
            hg::PatternFileError::Pattern(e, l) => match e {
                hg::PatternError::UnsupportedSyntax(m) => {
                    PatternFileError::new(py, ("PatternFileError", m, l))
                }
            },
        }
    }
}

py_exception!(shared_ref, AlreadyBorrowed, RuntimeError);