ruda-core 0.1.3

Shared types, device contracts and utilities for Ruda.
Documentation 
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use super::*;
use crate::s;
use alloc::vec;

#[test]
fn test_into_ranges() {
    let dims = [2, 3, 4, 5];
    let shape = Shape::new(dims);
    assert_eq!(shape.into_ranges(), vec![0..2, 0..3, 0..4, 0..5]);
}

#[allow(clippy::single_range_in_vec_init)]
#[test]
fn test_into_slices() {
    let slices = Shape::new([3]).into_slices(1..4);
    assert_eq!(slices[0].to_range(3), 1..3);

    let slices = Shape::new([3, 4]).into_slices(s![1..4, 0..2]);
    assert_eq!(slices[0].to_range(3), 1..3);
    assert_eq!(slices[1].to_range(4), 0..2);

    let slices = Shape::new([3]).into_slices(..-2);
    assert_eq!(slices[0].to_range(3), 0..1);

    let slices = Shape::new([2, 3, 4]).into_slices(s![.., 1..-1]);
    assert_eq!(slices[0].to_range(2), 0..2);
    assert_eq!(slices[1].to_range(3), 1..2);

    let slices = Shape::new([2, 3, 4]).into_slices(s![..20, 2]);
    assert_eq!(slices[0].to_range(2), 0..2);
    assert_eq!(slices[1].to_range(3), 2..3);
}

#[test]
fn test_shape_as_slice() {
    let dims = [2, 3, 4, 5];
    let shape = Shape::new(dims);

    assert_eq!(shape.as_slice(), dims.as_slice());

    // Deref coercion
    let shape_slice: &[usize] = &shape;
    assert_eq!(shape_slice, *&[2, 3, 4, 5]);
}

#[test]
fn test_shape_as_mut_slice() {
    let mut dims = [2, 3, 4, 5];
    let mut shape = Shape::new(dims);

    let shape_mut = shape.as_mut_slice();
    assert_eq!(shape_mut, dims.as_mut_slice());
    shape_mut[1] = 6;

    assert_eq!(shape_mut, &[2, 6, 4, 5]);

    let mut shape = Shape::new(dims);
    let shape = &mut shape[..];
    shape[1] = 6;

    assert_eq!(shape, shape_mut)
}

#[test]
fn test_shape_slice_output_shape_basic() {
    // Test basic slicing with step=1
    let slices = [
        Slice::new(0, Some(5), 1), // 5 elements
        Slice::new(2, Some(8), 1), // 6 elements
    ];
    let original_shape = Shape::new([10, 10, 10]);
    let result = original_shape.slice(&slices).unwrap();
    assert_eq!(result, Shape::new([5, 6, 10]));
}

#[test]
fn test_shape_slice_output_shape_with_positive_steps() {
    // Test slicing with various positive steps
    let slices = [
        Slice::new(0, Some(10), 2), // [0,2,4,6,8] -> 5 elements
        Slice::new(1, Some(9), 3),  // [1,4,7] -> 3 elements
        Slice::new(0, Some(7), 4),  // [0,4] -> 2 elements
    ];
    let original_shape = Shape::new([20, 20, 20, 30]);
    let result = original_shape.slice(&slices).unwrap();
    assert_eq!(result, Shape::new([5, 3, 2, 30]));
}

#[test]
fn test_shape_slice_output_shape_with_negative_steps() {
    // Test slicing with negative steps (backward iteration)
    let slices = [
        Slice::new(0, Some(10), -1), // 10 elements traversed backward
        Slice::new(2, Some(8), -2),  // [7,5,3] -> 3 elements
    ];
    let original_shape = Shape::new([20, 20, 20]);
    let result = original_shape.slice(&slices).unwrap();
    assert_eq!(result, Shape::new([10, 3, 20]));
}

#[test]
fn test_shape_slice_output_shape_mixed_steps() {
    // Test with a mix of positive, negative, and unit steps
    let slices = [
        Slice::from_range_stepped(1..6, 1),   // 5 elements
        Slice::from_range_stepped(0..10, -3), // [9,6,3,0] -> 4 elements
        Slice::from_range_stepped(2..14, 4),  // [2,6,10] -> 3 elements
    ];
    let original_shape = Shape::new([20, 20, 20]);
    let result = original_shape.slice(&slices).unwrap();
    assert_eq!(result, Shape::new([5, 4, 3]));
}

#[test]
fn test_shape_slice_output_shape_partial_dims() {
    // Test when slices has fewer dimensions than original shape
    let slices = [
        Slice::from_range_stepped(2..7, 2), // [2,4,6] -> 3 elements
    ];
    let original_shape = Shape::new([10, 20, 30, 40]);
    let result = original_shape.slice(&slices).unwrap();
    assert_eq!(result, Shape::new([3, 20, 30, 40]));
}

#[test]
fn test_shape_slice_output_shape_edge_cases() {
    // Test edge cases with small ranges and large steps
    let slices = [
        Slice::from_range_stepped(0..1, 1),    // Single element
        Slice::from_range_stepped(0..10, 100), // Step larger than range -> 1 element
        Slice::from_range_stepped(5..5, 1),    // Empty range -> 0 elements
    ];
    let original_shape = Shape::new([10, 20, 30]);
    let result = original_shape.slice(&slices).unwrap();
    assert_eq!(result, Shape::new([1, 1, 0]));
}

#[test]
fn test_shape_slice_output_shape_empty() {
    // Test with no slice infos (should return original shape)
    let slices = [];
    let original_shape = Shape::new([10, 20, 30]);
    let result = original_shape.slice(&slices).unwrap();
    assert_eq!(result, Shape::new([10, 20, 30]));
}

#[test]
fn test_shape_slice_output_shape_uneven_division() {
    // Test cases where range size doesn't divide evenly by step
    let slices = [
        Slice::from_range_stepped(0..7, 3), // ceil(7/3) = 3 elements: [0,3,6]
        Slice::from_range_stepped(0..11, 4), // ceil(11/4) = 3 elements: [0,4,8]
        Slice::from_range_stepped(1..10, 5), // ceil(9/5) = 2 elements: [1,6]
    ];
    let original_shape = Shape::new([20, 20, 20]);
    let result = original_shape.slice(&slices).unwrap();
    assert_eq!(result, Shape::new([3, 3, 2]));
}