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use crate::{
core::prelude::*,
errors::prelude::*,
};
impl <N: ArrayElement> IntoIterator for Array<N> {
type Item = N;
type IntoIter = std::vec::IntoIter<N>;
fn into_iter(self) -> Self::IntoIter {
self.elements.into_iter()
}
}
impl<'a, N: ArrayElement> IntoIterator for &'a Array<N> {
type Item = &'a N;
type IntoIter = std::slice::Iter<'a, N>;
fn into_iter(self) -> Self::IntoIter {
self.elements.iter()
}
}
impl <N: ArrayElement> FromIterator<N> for Array<N> {
fn from_iter<T: IntoIterator<Item=N>>(iter: T) -> Self {
Self::flat(iter.into_iter().collect()).unwrap()
}
}
/// `ArrayTrait` - Array Iterable functions
pub trait ArrayIter<T: ArrayElement> where Self: Sized + Clone {
/// Loop over array elements
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.for_each(|item| println!("{item}")).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn for_each<F: FnMut(&T)>(&self, f: F) -> Result<(), ArrayError>;
/// Loop over enumerated array elements
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.for_each_e(|idx, item| println!("{idx}:{item}")).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn for_each_e<F: FnMut(usize, &T)>(&self, f: F) -> Result<(), ArrayError>;
/// Filter over array elements
/// Returns a flat filtered array
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr: Array<i32> = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.filter(|item| item % 2 == 0).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn filter<F: FnMut(&T) -> bool>(&self, f: F)-> Result<Array<T>, ArrayError>;
/// Filter over enumerated array elements
/// Returns a flat filtered array
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr: Array<i32> = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.filter_e(|idx, item| item % (idx + 1) as i32 == 0).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn filter_e<F: FnMut(usize, &T) -> bool>(&self, f: F)-> Result<Array<T>, ArrayError>;
}
impl <T: ArrayElement> ArrayIter<T> for Array<T> {
fn for_each<F: FnMut(&T)>(&self, f: F) -> Result<(), ArrayError> {
self.elements.iter().for_each(f);
Ok(())
}
fn for_each_e<F: FnMut(usize, &T)>(&self, mut f: F) -> Result<(), ArrayError> {
self.elements.iter().enumerate().for_each(|(idx, item)| f(idx, item));
Ok(())
}
fn filter<F: FnMut(&T) -> bool>(&self, mut f: F) -> Result<Self, ArrayError> {
self.elements.clone().into_iter()
.filter(|item| f(item))
.collect::<Self>()
.ravel()
}
fn filter_e<F: FnMut(usize, &T) -> bool>(&self, mut f: F) -> Result<Self, ArrayError> {
self.elements.clone().into_iter().enumerate()
.filter(|(idx, item)| f(*idx, item))
.map(|i| i.1)
.collect::<Self>()
.ravel()
}
}
/// `ArrayTrait` - Array Iterable functions
pub trait ArrayIterMut<S: ArrayElement, T: ArrayElement> where Self: Sized + Clone {
/// Map over array elements
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr: Array<i32> = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.map(|item| item * 2).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn map<F: FnMut(&T) -> S>(&self, f: F)-> Result<Array<S>, ArrayError>;
/// Map over enumerated array elements
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr: Array<i32> = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.map_e(|idx, item| item * idx as i32).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn map_e<F: FnMut(usize, &T) -> S>(&self, f: F)-> Result<Array<S>, ArrayError>;
/// Filter and map over array elements
/// Returns a flat filtered array
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr: Array<i32> = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.filter_map(|item| if item % 2 == 0 { Some(*item) } else { None }).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn filter_map<F: FnMut(&T) -> Option<S>>(&self, f: F)-> Result<Array<S>, ArrayError>;
/// Filter and map over enumerated array elements
/// Returns a flat filtered array
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr: Array<i32> = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.filter_map_e(|idx, item| if item % (idx + 1) as i32 == 0 { Some(*item) } else { None }).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn filter_map_e<F: FnMut(usize, &T) -> Option<S>>(&self, f: F)-> Result<Array<S>, ArrayError>;
/// Fold elements of array elements
///
/// # Arguments
///
/// * `f` - function to be called on each array element
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr: Array<i32> = Array::new(vec![1, 2, 3, 4, 5, 6, 7, 8], vec![2, 4]).unwrap();
/// arr.fold(0, |a, b| a + b).unwrap();
/// arr.fold(1, |a, b| a * b).unwrap();
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn fold<F: FnMut(&S, &T) -> S>(&self, init: S, f: F) -> Result<S, ArrayError>;
/// 'Zips up' two iterators into a single iterator of pairs
///
/// # Arguments
///
/// * `other` - array to zip with
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr_1: Array<i32> = Array::flat(vec![1, 2]).unwrap();
/// let arr_2: Array<i32> = Array::flat(vec![5, 6]).unwrap();
/// assert_eq!(Array::flat(vec![Tuple2(1, 5), Tuple2(2, 6)]), arr_1.zip(&arr_2));
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn zip(&self, other: &Array<S>) -> Result<Array<Tuple2<T, S>>, ArrayError>;
}
impl <S: ArrayElement, T: ArrayElement> ArrayIterMut<S, T> for Array<T> {
fn map<F: FnMut(&T) -> S>(&self, f: F) -> Result<Array<S>, ArrayError> {
self.elements.iter()
.map(f)
.collect::<Array<S>>()
.reshape(&self.get_shape()?)
}
fn map_e<F: FnMut(usize, &T) -> S>(&self, mut f: F) -> Result<Array<S>, ArrayError> {
self.elements.iter().enumerate()
.map(|(idx, item)| f(idx, item))
.collect::<Array<S>>()
.reshape(&self.get_shape()?)
}
fn filter_map<F: FnMut(&T) -> Option<S>>(&self, f: F) -> Result<Array<S>, ArrayError> {
self.elements.clone().iter()
.filter_map(f)
.collect::<Array<S>>()
.ravel()
}
fn filter_map_e<F: FnMut(usize, &T) -> Option<S>>(&self, mut f: F) -> Result<Array<S>, ArrayError> {
self.elements.clone().iter().enumerate()
.filter_map(|(idx, item)| f(idx, item))
.collect::<Array<S>>()
.ravel()
}
fn fold<F: FnMut(&S, &T) -> S>(&self, init: S, mut f: F) -> Result<S, ArrayError> {
let result = self.elements.iter().fold(init, |a, b| f(&a, b));
Ok(result)
}
fn zip(&self, other: &Array<S>) -> Result<Array<Tuple2<T, S>>, ArrayError> {
let other = other.broadcast_to(self.get_shape()?)?;
self.get_elements()?.into_iter()
.zip(other.get_elements()?)
.map(|item| Tuple2(item.0, item.1))
.collect::<Array<Tuple2<T, S>>>()
.reshape(&self.get_shape()?)
}
}