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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2026 metamuffin <metamuffin.org>
*/
use crate::{Object, Tag, TypedTag};
use std::{fmt::Display, marker::PhantomData, str::FromStr};
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Path(pub Vec<Tag>);
impl Path {
pub fn get_matching_value<'a>(&self, ob: Object<'a>) -> Option<&'a [u8]> {
fn recurse<'a>(ob: Object<'a>, path: &[Tag]) -> Option<&'a [u8]> {
if path.len() > 1 {
recurse(ob.get(TypedTag(path[0], PhantomData))?, &path[1..])
} else {
ob.get(TypedTag(path[0], PhantomData))
}
}
recurse(ob, &self.0)
}
pub fn get_matching_values<'a>(&self, ob: Object<'a>) -> Vec<&'a [u8]> {
fn recurse<'a>(ob: Object<'a>, out: &mut Vec<&'a [u8]>, path: &[Tag]) {
if path.len() > 1 {
for nested in ob.iter(TypedTag(path[0], PhantomData::<Object>)) {
recurse(nested, out, &path[1..]);
}
} else {
out.extend(ob.iter(TypedTag(path[0], PhantomData::<&[u8]>)));
}
}
let mut out = Vec::new();
recurse(ob, &mut out, &self.0);
out
}
}
impl Display for Path {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
for (i, c) in self.0.iter().enumerate() {
if i > 0 {
write!(f, ".")?;
}
write!(f, "{c}")?;
}
Ok(())
}
}
impl FromStr for Path {
type Err = &'static str;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Ok(Self(
s.split(".")
.map(|e| {
e.as_bytes()
.try_into()
.map_err(|_| "path component not 4 bytes")
.map(Tag::new)
})
.collect::<Result<Vec<Tag>, &'static str>>()?,
))
}
}
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