95 lines
3.8 KiB
Rust
95 lines
3.8 KiB
Rust
//! Pronoun selection & parsing for various version of user preferences
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//!
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//! There may be several possible representations of parsed prefstrings, each of which possibly
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//! with a different algorithm for selecting pronouns, and a different way of parsing itself. This
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//! module houses the implementations for each of these versions.
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pub mod v0;
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mod error;
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pub use error::ParseError;
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use crate::{InstanceSettings, WeightedTable};
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use data_encoding::BASE32_NOPAD;
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/// A user's preferences for the probabilities of certain pronouns
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///
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/// This is the parsed version of a prefstring. The actual implementation details may vary across
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/// versions, but universally they must be able to at least produce a weighted list of pronouns,
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/// representing the probabilities the user wants for each pronoun set.
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///
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/// To this end, all versions of the user preferences implement [`Preference`]. For convenience,
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/// `UserPreferences` also implements [`Preference`].
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///
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/// Because parsing a prefstring must be done in relation to an [`InstanceSettings`], the
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/// `UserPreferences` struct shares a lifetime with the settings it was created with.
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#[non_exhaustive]
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pub enum UserPreferences {
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V0(v0::UserPreferencesV0)
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}
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/// Functionality provided by any version of user preferences
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///
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/// See also: [`UserPreferences`]
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pub trait Preference {
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/// Produce a weighted list of pronouns based on these preferences
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///
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/// This is a one-directional conversion to a [`WeightedTable`]. This method is a
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/// crucial step to randomly selecting a pronoun set based on a user's preferences, as
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/// any selection is done by using a [`WeightedTable`]. All preference versions must
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/// implement this method.
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fn into_weighted_table<'a>(&self, settings: &'a InstanceSettings) -> WeightedTable<'a>;
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/// Parse a given prefstring, after it's extraction from base64
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///
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/// This should attempt to parse the data contained in a prefstring into the appropriate
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/// format. Prefstrings will already have been parsed from base64 before being passed to the
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/// implementation. Users looking to turn a b64 prefstring into a `Preference` should use
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/// [`Preference::from_prefstring()`]
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fn from_prefstring_bytes(bytes: &[u8]) -> Result<Self, ParseError> where Self: Sized;
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/// Serialize these preferences into as few bytes as possible
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///
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/// This should produce a series of bytes that, when passed to
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/// [`Preference::from_prefstring_bytes()`] should produce this `Preference` object again.
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/// This should be done in accordance with the [prefstring specification][1].
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///
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/// [1]: https://fem.mint.lgbt/Emi/PronounsToday/raw/branch/main/doc/User-Preference-String-Spec.txt
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fn into_prefstring_bytes(&self) -> Vec<u8>;
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/// Parse a base64 prefstring
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///
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/// This is the primary method of creating a `Preference` object from a prefstring. The
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/// default implementation calls the underlying [`Preference::from_prefstring_bytes()`] method.
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fn from_prefstring(prefstring: &str) -> Result<Self, ParseError> where Self: Sized {
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BASE32_NOPAD.decode(prefstring.as_ref())
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.map_err(ParseError::Base32Error)
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.and_then(|ps| Self::from_prefstring_bytes(&ps))
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}
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/// Serialize into a base64 prefstring
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///
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/// This is the primary method of creating a prefstring from a `Preference` object. The
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/// default implementation calls the underlying [`Preference::into_prefstring_bytes()`] method.
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fn into_prefstring(&self) -> String {
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BASE32_NOPAD.encode(&self.into_prefstring_bytes())
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}
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}
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impl Preference for UserPreferences {
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fn into_weighted_table<'a>(&self, settings: &'a InstanceSettings) -> WeightedTable<'a> {
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match self {
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UserPreferences::V0(pref) => pref,
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}.into_weighted_table(settings)
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}
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fn from_prefstring_bytes(bytes: &[u8]) -> Result<Self, ParseError> where Self: Sized {
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todo!()
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}
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fn into_prefstring_bytes(&self) -> Vec<u8> {
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todo!()
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}
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}
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