numpy 0.3.0

Rust binding of NumPy C-API
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73

//! Defines error types.

use pyo3::*;
use std::error;
use std::fmt;
use types::NpyDataType;

pub trait IntoPyErr {
    fn into_pyerr(self, msg: &str) -> PyErr;
}

pub trait IntoPyResult {
    type ValueType;
    fn into_pyresult(self, msg: &str) -> PyResult<Self::ValueType>;
}

impl<T, E: IntoPyErr> IntoPyResult for Result<T, E> {
    type ValueType = T;
    fn into_pyresult(self, msg: &str) -> PyResult<T> {
        self.map_err(|e| e.into_pyerr(msg))
    }
}

/// Represents a casting error between rust types and numpy array.
#[derive(Debug)]
pub enum ArrayCastError {
    /// Error for casting `PyArray` into `ArrayView` or `ArrayViewMut`
    ToRust { from: NpyDataType, to: NpyDataType },
    /// Error for casting rust's `Vec` into numpy array.
    FromVec,
}

impl ArrayCastError {
    pub(crate) fn to_rust(from: i32, to: NpyDataType) -> Self {
        ArrayCastError::ToRust {
            from: NpyDataType::from_i32(from),
            to,
        }
    }
}

impl fmt::Display for ArrayCastError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            ArrayCastError::ToRust { from, to } => {
                write!(f, "Cast failed: from={:?}, to={:?}", from, to)
            }
            ArrayCastError::FromVec => write!(f, "Cast failed: FromVec (maybe invalid dimension)"),
        }
    }
}

impl error::Error for ArrayCastError {
    fn description(&self) -> &str {
        match self {
            ArrayCastError::ToRust { .. } => "ArrayCast failed(IntoArray)",
            ArrayCastError::FromVec => "ArrayCast failed(FromVec)",
        }
    }
}

impl IntoPyErr for ArrayCastError {
    fn into_pyerr(self, msg: &str) -> PyErr {
        let msg = match self {
            ArrayCastError::ToRust { from, to } => format!(
                "ArrayCastError::ToRust: from: {:?}, to: {:?}, msg: {}",
                from, to, msg
            ),
            ArrayCastError::FromVec => format!("ArrayCastError::FromVec: {}", msg),
        };
        PyErr::new::<exc::TypeError, _>(msg)
    }
}