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Make mentioned_users somewhat less terrible

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This commit is contained in:
Maybe Waffle 2023-07-29 14:42:31 +04:00
parent 10846e19fd
commit 86a145e805
1 changed files with 27 additions and 8 deletions
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35
crates/teloxide-core/src/types/update.rs
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@ -154,16 +154,35 @@ impl Update {
/// replies, pinned messages, message entities, "via bot" fields and more. /// replies, pinned messages, message entities, "via bot" fields and more.
/// Also note that this function can return duplicate users. /// Also note that this function can return duplicate users.
pub fn mentioned_users(&self) -> impl Iterator<Item = &User> { pub fn mentioned_users(&self) -> impl Iterator<Item = &User> {
use either::Either::{Left, Right}; use either::Either::{Left as L, Right as R};
use std::iter::{empty, once}; use std::iter::{empty, once};
let i0 = Left; // [root]
let i1 = |x| Right(Left(x)); // / \
let i2 = |x| Right(Right(Left(x))); // left - / \ - right
let i3 = |x| Right(Right(Right(Left(x)))); // / \
let i4 = |x| Right(Right(Right(Right(Left(x))))); // /\ /\
let i5 = |x| Right(Right(Right(Right(Right(Left(x)))))); // / \ / \
let i6 = |x| Right(Right(Right(Right(Right(Right(x)))))); // / \ / \
// 0 /\ /\ /\
// / \ / \ / \
// 1 2 3 4 5 6
//
// 0 = LL
// 1 = LRL
// 2 = LRR
// 3 = RLL
// 4 = RLR
// 5 = RRL
// 6 = RRR
let i0 = |x| L(L(x));
let i1 = |x| L(R(L(x)));
let i2 = |x| L(R(R(x)));
let i3 = |x| R(L(L(x)));
let i4 = |x| R(L(R(x)));
let i5 = |x| R(R(L(x)));
let i6 = |x| R(R(R(x)));
match &self.kind { match &self.kind {
UpdateKind::Message(message) UpdateKind::Message(message)