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use crate::errors::Result;
use crate::stringhandle::StringArray;
use std::borrow::Cow;
pub struct DataArray<'a, T>
where
[T]: ToOwned<Owned = Vec<T>>,
{
data: Cow<'a, [T]>,
sizes: Cow<'a, [i32]>,
}
impl<'a, T> DataArray<'a, T>
where
[T]: ToOwned<Owned = Vec<T>>,
{
pub fn new(dat: &'a [T], sizes: &'a [i32]) -> DataArray<'a, T> {
DataArray {
data: Cow::Borrowed(dat),
sizes: Cow::Borrowed(sizes),
}
}
pub(crate) fn new_owned(dat: Vec<T>, sizes: Vec<i32>) -> DataArray<'static, T> {
DataArray {
data: Cow::Owned(dat),
sizes: Cow::Owned(sizes),
}
}
pub fn data(&self) -> &[T] {
self.data.as_ref()
}
pub fn data_mut(&mut self) -> &mut [T] {
self.data.to_mut().as_mut()
}
pub fn sizes(&self) -> &[i32] {
self.sizes.as_ref()
}
pub fn iter(&'a self) -> ArrayIter<'a, T> {
ArrayIter {
sizes: self.sizes.iter(),
data: self.data.as_ref(),
cursor: 0,
}
}
pub fn iter_mut(&'a mut self) -> ArrayIterMut<'a, T> {
ArrayIterMut {
sizes: self.sizes.to_mut().iter_mut(),
data: self.data.to_mut().as_mut(),
cursor: 0,
}
}
}
pub struct StringMultiArray {
pub(crate) handles: Vec<i32>,
pub(crate) sizes: Vec<i32>,
pub(crate) session: crate::session::Session,
}
pub struct ArrayIter<'a, T> {
data: &'a [T],
sizes: std::slice::Iter<'a, i32>,
cursor: usize,
}
pub struct ArrayIterMut<'a, T> {
data: &'a mut [T],
sizes: std::slice::IterMut<'a, i32>,
cursor: usize,
}
pub struct MultiArrayIter<'a> {
handles: std::slice::Iter<'a, i32>,
sizes: std::slice::Iter<'a, i32>,
session: &'a crate::session::Session,
cursor: usize,
}
impl<'a, T> Iterator for ArrayIter<'a, T> {
type Item = &'a [T];
fn next(&mut self) -> Option<Self::Item> {
match self.sizes.next() {
None => None,
Some(size) => {
let start = self.cursor;
let end = self.cursor + (*size as usize);
self.cursor = end;
Some(&self.data[start..end])
}
}
}
}
impl<'a, T> Iterator for ArrayIterMut<'a, T> {
type Item = &'a mut [T];
fn next(&mut self) -> Option<Self::Item> {
match self.sizes.next() {
None => None,
Some(size) => {
let start = self.cursor;
let end = self.cursor + (*size as usize);
self.cursor = end;
let slice = unsafe { &mut *(self.data[start..end].as_mut() as *mut [T]) };
Some(slice)
}
}
}
}
impl StringMultiArray {
pub fn iter(&self) -> MultiArrayIter<'_> {
MultiArrayIter {
handles: self.handles.iter(),
sizes: self.sizes.iter(),
session: &self.session,
cursor: 0,
}
}
}
impl<'a> Iterator for MultiArrayIter<'a> {
type Item = Result<StringArray>;
fn next(&mut self) -> Option<Self::Item> {
match self.sizes.next() {
None => None,
Some(size) => {
let start = self.cursor;
let end = self.cursor + (*size as usize);
self.cursor = end;
let handles = &self.handles.as_slice()[start..end];
Some(crate::stringhandle::get_string_array(handles, self.session))
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn data_array_iter() {
let ar = DataArray::new_owned(vec![1, 2, 3, 4, 5, 6], vec![2, 1, 3]);
let mut iter = ar.iter();
assert_eq!(iter.next(), Some([1, 2].as_slice()));
assert_eq!(iter.next(), Some([3].as_slice()));
assert_eq!(iter.next(), Some([4, 5, 6].as_slice()));
}
#[test]
fn data_array_mutate() {
let mut ar = DataArray::new(&[1, 2, 3, 4, 5, 6], &[2, 1, 3]);
let mut iter = ar.iter_mut().map(|v| {
v.iter_mut().for_each(|v| *v *= 2);
v
});
assert_eq!(iter.next(), Some([2, 4].as_mut_slice()));
assert_eq!(iter.next(), Some([6].as_mut_slice()));
assert_eq!(iter.next(), Some([8, 10, 12].as_mut_slice()));
}
}