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use std::{fmt, string::String as StdString};
use sqlx::{
Database, Decode, Type,
encode::{Encode, IsNull},
};
pub trait Normalize: Clone + Default {
fn normalize(&self, value: &str) -> StdString;
}
#[derive(Clone, Debug, Default, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
#[serde(into = "StdString", from = "StdString")]
#[serde(bound = "N: Normalize")]
pub struct String<N>(StdString, N);
impl<N> fmt::Display for String<N> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let Self(value, _) = self;
value.fmt(f)
}
}
impl<S, N> From<S> for String<N>
where
S: AsRef<str>,
N: Normalize,
{
fn from(value: S) -> Self {
let normalizer = N::default();
let value = normalizer.normalize(value.as_ref());
Self(value, normalizer)
}
}
impl<N> From<String<N>> for StdString {
fn from(value: String<N>) -> Self {
let String(value, _) = value;
value
}
}
impl<N> std::ops::Deref for String<N> {
type Target = StdString;
fn deref(&self) -> &Self::Target {
let Self(value, _) = self;
value
}
}
// Type is manually implemented so that we can implement Decode to do
// normalization on read. Implementation is otherwise based on
// `#[derive(sqlx::Type)]` with the `#[sqlx(transparent)]` attribute.
impl<DB, N> Type<DB> for String<N>
where
DB: Database,
StdString: Type<DB>,
{
fn type_info() -> <DB as Database>::TypeInfo {
<StdString as Type<DB>>::type_info()
}
fn compatible(ty: &<DB as Database>::TypeInfo) -> bool {
<StdString as Type<DB>>::compatible(ty)
}
}
impl<'r, DB, N> Decode<'r, DB> for String<N>
where
DB: Database,
StdString: Decode<'r, DB>,
N: Normalize,
{
fn decode(value: <DB as Database>::ValueRef<'r>) -> Result<Self, sqlx::error::BoxDynError> {
let value = StdString::decode(value)?;
Ok(Self::from(value))
}
}
impl<'q, DB, N> Encode<'q, DB> for String<N>
where
DB: Database,
StdString: Encode<'q, DB>,
{
fn encode(
self,
buf: &mut <DB as Database>::ArgumentBuffer<'q>,
) -> Result<IsNull, sqlx::error::BoxDynError> {
let Self(value, _) = self;
value.encode(buf)
}
fn encode_by_ref(
&self,
buf: &mut <DB as Database>::ArgumentBuffer<'q>,
) -> Result<IsNull, sqlx::error::BoxDynError> {
let Self(value, _) = self;
value.encode_by_ref(buf)
}
fn produces(&self) -> Option<<DB as Database>::TypeInfo> {
let Self(value, _) = self;
value.produces()
}
fn size_hint(&self) -> usize {
let Self(value, _) = self;
value.size_hint()
}
}
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