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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
use crate::page::Page;
use serde::Deserialize;
/// Abstracts away the `next_page` logic into a single stream of items
///
/// ```no_run
/// # extern crate elefren;
/// # use elefren::prelude::*;
/// # use std::error::Error;
/// # fn main() -> Result<(), Box<dyn Error>> {
/// # let data = Data {
/// # base: "".into(),
/// # client_id: "".into(),
/// # client_secret: "".into(),
/// # redirect: "".into(),
/// # token: "".into(),
/// # };
/// let client = Mastodon::from(data);
/// let statuses = client.statuses("user-id", None)?;
/// for status in statuses.items_iter() {
/// // do something with `status`
/// }
/// # Ok(())
/// # }
/// ```
#[derive(Debug, Clone)]
pub(crate) struct ItemsIter<'a, T: Clone + for<'de> Deserialize<'de>> {
page: Page<'a, T>,
buffer: Vec<T>,
cur_idx: usize,
use_initial: bool,
}
impl<'a, T: Clone + for<'de> Deserialize<'de>> ItemsIter<'a, T> {
pub(crate) fn new(page: Page<'a, T>) -> ItemsIter<'a, T> {
ItemsIter {
page,
buffer: vec![],
cur_idx: 0,
use_initial: true,
}
}
fn need_next_page(&self) -> bool {
self.buffer.is_empty() || self.cur_idx == self.buffer.len()
}
fn fill_next_page(&mut self) -> Option<()> {
let items = if let Ok(items) = self.page.next_page() {
items
} else {
return None;
};
if let Some(items) = items {
if items.is_empty() {
return None;
}
self.buffer = items;
self.cur_idx = 0;
Some(())
} else {
None
}
}
}
impl<'a, T: Clone + for<'de> Deserialize<'de>> Iterator for ItemsIter<'a, T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
if self.use_initial {
if self.page.initial_items.is_empty() || self.cur_idx == self.page.initial_items.len() {
return None;
}
let idx = self.cur_idx;
if self.cur_idx == self.page.initial_items.len() - 1 {
self.cur_idx = 0;
self.use_initial = false;
} else {
self.cur_idx += 1;
}
Some(self.page.initial_items[idx].clone())
} else {
if self.need_next_page() && self.fill_next_page().is_none() {
return None;
}
let idx = self.cur_idx;
self.cur_idx += 1;
Some(self.buffer[idx].clone())
}
}
}
|
