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use super::Nesting;
use std::{
fmt::{self, Display, Formatter, Write},
ops::Deref,
};
pub const ESCAPED_TEXT_CHARACTERS: [(char, &str); 3] =
[('<', "<"), ('>', ">"), ('&', "&")];
pub trait Formattable {
#[allow(clippy::missing_errors_doc)]
fn format(&self, formatter: &mut Formatter, _: Nesting) -> fmt::Result;
}
impl_primitives!(Formattable);
impl_tuples!(Formattable);
impl Formattable for char {
fn format(&self, formatter: &mut Formatter, _: Nesting) -> fmt::Result {
if let Some((_, escaped)) =
ESCAPED_TEXT_CHARACTERS.iter().find(|(c, _)| *c == *self)
{
formatter.write_str(escaped)
} else {
formatter.write_char(*self)
}
}
}
impl Formattable for &'_ str {
fn format(
&self,
formatter: &mut Formatter,
nesting: Nesting,
) -> fmt::Result {
self.chars()
.map(|character| character.format(formatter, nesting))
.collect()
}
}
impl Formattable for String {
fn format(
&self,
formatter: &mut Formatter,
nesting: Nesting,
) -> fmt::Result {
self.as_str().format(formatter, nesting)
}
}
impl<T: Formattable> Formattable for &'_ [T] {
fn format(
&self,
formatter: &mut Formatter,
nesting: Nesting,
) -> fmt::Result {
self.iter().map(|x| x.format(formatter, nesting)).collect()
}
}
impl<T: Formattable> Formattable for Vec<T> {
fn format(
&self,
formatter: &mut Formatter,
nesting: Nesting,
) -> fmt::Result {
self.as_slice().format(formatter, nesting)
}
}
impl<T: Formattable + ?Sized> Formattable for Box<T> {
fn format(
&self,
formatter: &mut Formatter,
nesting: Nesting,
) -> fmt::Result {
self.deref().format(formatter, nesting)
}
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
#[must_use = "HTML needs to be turned into a String with `.to_string()`"]
pub struct Html<T>(T);
pub fn html<T: Formattable>(content: T) -> Html<T> {
Html(content)
}
impl<T: Formattable> Formattable for Html<T> {
fn format(
&self,
formatter: &mut Formatter,
nesting: Nesting,
) -> fmt::Result {
self.0.format(formatter, nesting)
}
}
impl<T: Formattable> Display for Html<T> {
fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
self.format(formatter, Nesting::default())
}
}