hashi 0.2.1

WASM utilities
Documentation 
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
74
75
76
77

use js_sys::{IntoIter, try_iter};
use std::marker::PhantomData;
use wasm_bindgen::prelude::*;

pub struct JsCastIter<T: JsCast> {
  iter: Option<IntoIter>,
  phantom: PhantomData<T>,
}

impl<T: JsCast> JsCastIter<T> {
  pub fn new(value: &JsValue) -> Self {
    Self {
      iter: try_iter(value).unwrap_or_default(),
      phantom: PhantomData,
    }
  }

  pub fn empty() -> Self {
    Self { iter: None, phantom: PhantomData }
  }
}

impl<T: JsCast> Iterator for JsCastIter<T> {
  type Item = T;

  fn next(&mut self) -> Option<Self::Item> {
    if let Some(iter) = &mut self.iter {
      for value in iter.by_ref() {
        if let Ok(value) = value.and_then(JsCast::dyn_into) {
          return Some(value);
        }
      }
    }

    None
  }
}

pub struct JsUncheckedCastIter<T: JsCast> {
  iter: Option<IntoIter>,
  phantom: PhantomData<T>,
}

impl<T: JsCast> JsUncheckedCastIter<T> {
  pub fn new(value: &JsValue) -> Self {
    Self {
      iter: try_iter(value).unwrap_or_default(),
      phantom: PhantomData,
    }
  }

  pub fn empty() -> Self {
    Self { iter: None, phantom: PhantomData }
  }
}

impl<T: JsCast> Iterator for JsUncheckedCastIter<T> {
  type Item = T;

  fn next(&mut self) -> Option<Self::Item> {
    if let Some(iter) = &mut self.iter
      && let Some(value) = iter.by_ref().flatten().next()
    {
      return Some(value.unchecked_into());
    }

    None
  }
}

pub fn cast_iter<T: JsCast>(value: &JsValue) -> JsCastIter<T> {
  JsCastIter::new(value)
}

pub fn unchecked_cast_iter<T: JsCast>(value: &JsValue) -> JsUncheckedCastIter<T> {
  JsUncheckedCastIter::new(value)
}