classify_iana (flag.rs)

Email flag (a.k.a. keyword) shared across all protocols. ! ! A [`Flag`] carries two views of the same value: the original wire ! spelling as observed on the backend, and an optional [`IanaFlag`] ! classification when the wire string matches an IANA-registered ! keyword (case-in

// Source: https://github.com/pimalaya/himalaya | License: Apache-2.0 | Copyright 2022-2026 soywod <pimalaya.org@posteo.net>
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//! # Flag
//!
//! An email flag (keyword) shared across all protocols: its wire spelling
//! as observed on the backend, plus an [`IanaFlag`] classification when
//! that spelling matches a registered keyword.
//!
//! Equality, ordering and hashing are IANA-first, so `\Seen`, `$seen` and
//! `seen` collapse to one logical flag while custom keywords compare
//! case-insensitively. That is what makes a `BTreeSet<Flag>` a normalised
//! set across backends.

use std::{
    cmp::Ordering,
    hash::{Hash, Hasher},
};

use schemars::JsonSchema;
use serde::{Deserialize, Serialize};

/// A flag attached to an

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