rust-postgres-array/src/lib.rs at master · psqlpy-python/rust-postgres-array · GitHub

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//! Multi-dimensional arrays with per-dimension specifiable lower bounds

#![doc(html_root_url = "https://docs.rs/postgres_array/0.10")]

#[doc(inline)]

pub use crate::array::Array;

pub mod array;

mod impls;

/// Information about a dimension of an array.

#[derive(Debug, Clone, Copy, PartialEq, Eq)]

pub struct Dimension {

/// The length of the dimension.

pub len: i32,

/// The index of the first element of the dimension.

pub lower_bound: i32,

}

impl Dimension {

fn shift(&self, idx: i32) -> i32 {

let offset = self.lower_bound;

assert!(idx >= offset, "out of bounds array access");

assert!(

offset >= 0 || idx <= 0 || i32::max_value() - (-offset) >= idx,

"out of bounds array access"

);

match idx.checked_sub(offset) {

Some(shifted) => shifted,

None => panic!("out of bounds array access"),

}

#[cfg(test)]

mod tests {

use super::*;

#[test]

fn test_from_vec() {

let a = Array::from_vec(vec![0i32, 1, 2], -1);

assert!(

&[Dimension {

len: 3,

lower_bound: -1,

},][..]

== a.dimensions()

);

assert_eq!(0, a[-1]);

assert_eq!(1, a[0]);

assert_eq!(2, a[1]);

}

#[test]

fn test_into_inner() {

let a = Array::from_vec(vec![0i32, 1, 2], -1);

let a = a.into_inner();

assert_eq!(a.len(), 3);

assert_eq!(0, a[0]);

assert_eq!(1, a[1]);

assert_eq!(2, a[2]);

}

#[test]

fn test_2d_slice_get() {

let mut a = Array::from_vec(vec![0i32, 1, 2], -1);

a.wrap(1);

assert_eq!(0, a[(1, -1)]);

assert_eq!(1, a[(1, 0)]);

assert_eq!(2, a[(1, 1)]);

}

#[test]

#[should_panic]

fn test_push_wrong_lower_bound() {

let mut a = Array::from_vec(vec![1i32], -1);

a.push(Array::from_vec(vec![2], 0));

}

#[test]

#[should_panic]

fn test_push_wrong_dims() {

let mut a = Array::from_vec(vec![1i32], -1);

a.wrap(1);

a.push(Array::from_vec(vec![1, 2], -1));

}

#[test]

#[should_panic]

fn test_push_wrong_dim_count() {

let mut a = Array::from_vec(vec![1i32], -1);

a.wrap(1);

let mut b = Array::from_vec(vec![2], -1);

b.wrap(1);

a.push(b);

}

#[test]

fn test_push_ok() {

let mut a = Array::from_vec(vec![1i32, 2], 0);

a.wrap(0);

a.push(Array::from_vec(vec![3, 4], 0));

assert_eq!(1, a[(0, 0)]);

assert_eq!(2, a[(0, 1)]);

assert_eq!(3, a[(1, 0)]);

assert_eq!(4, a[(1, 1)]);

}

#[test]

fn test_3d() {

let mut a = Array::from_vec(vec![0i32, 1], 0);

a.wrap(0);

a.push(Array::from_vec(vec![2, 3], 0));

a.wrap(0);

let mut b = Array::from_vec(vec![4, 5], 0);

b.wrap(0);

b.push(Array::from_vec(vec![6, 7], 0));

a.push(b);

assert_eq!(0, a[(0, 0, 0)]);

assert_eq!(1, a[(0, 0, 1)]);

assert_eq!(2, a[(0, 1, 0)]);

assert_eq!(3, a[(0, 1, 1)]);

assert_eq!(4, a[(1, 0, 0)]);

assert_eq!(5, a[(1, 0, 1)]);

assert_eq!(6, a[(1, 1, 0)]);

assert_eq!(7, a[(1, 1, 1)]);

}

#[test]

fn test_mut() {

let mut a = Array::from_vec(vec![1i32, 2], 0);

a.wrap(0);

a[(0, 0)] = 3;

assert_eq!(3, a[(0, 0)]);

}

#[test]

fn test_display() {

let a = Array::from_vec(vec![0i32, 1, 2, 3, 4], 1);

assert_eq!("{0,1,2,3,4}", &format!("{}", a));

let a = Array::from_vec(vec![0i32, 1, 2, 3, 4], -3);

assert_eq!("[-3:1]={0,1,2,3,4}", &format!("{}", a));

let mut a = Array::from_vec(vec![1i32, 2, 3], 3);

a.wrap(-2);

a.push(Array::from_vec(vec![4, 5, 6], 3));

a.wrap(1);

assert_eq!("[1:1][-2:-1][3:5]={{{1,2,3},{4,5,6}}}", &format!("{}", a));

let a: Array<String> = Array::from_parts(vec![], vec![]);

assert_eq!("{}", &format!("{}", a));

}

rust-postgres-array/src/lib.rs at master · psqlpy-python/rust-postgres-array · GitHub

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