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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::{Filter, Value};
use jellyobject::{Object, Path};
/// Sorted list of components to bin objects by filtered values.
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Binning(pub Vec<BinningComponent>);
#[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
pub enum BinningComponent {
Has(Path),
Match(Path),
}
impl Binning {
pub fn new(mut comps: Vec<BinningComponent>) -> Self {
comps.sort();
Self(comps)
}
pub fn apply(&self, ob: &Object, keys: &mut Vec<Vec<u8>>) {
for f in &self.0 {
f.apply(ob, keys);
}
}
}
impl BinningComponent {
pub fn apply(&self, ob: &Object, keys: &mut Vec<Vec<u8>>) {
match self {
BinningComponent::Has(path) => {
if path.get_matching_value(ob).is_none() {
keys.clear();
}
}
BinningComponent::Match(path) => {
let mut new_out = Vec::new();
for value in path.get_matching_values(ob) {
for mut co in keys.clone() {
co.extend((value.len() as u32).to_be_bytes());
co.extend(value);
new_out.push(co);
}
}
*keys = new_out;
}
}
}
}
impl Filter<'_> {
pub fn get_binnings(&self) -> Vec<Binning> {
self.get_bins_inner()
.into_iter()
.map(|e| Binning(e.into_iter().map(|(e, _)| e).collect()))
.collect()
}
pub fn get_bins(&self) -> Vec<(Binning, Vec<u8>)> {
self.get_bins_inner()
.into_iter()
.map(|e| {
let (a, b): (Vec<BinningComponent>, Vec<Vec<u8>>) = e.into_iter().unzip();
(Binning(a), b.into_iter().flatten().collect())
})
.collect()
}
fn get_bins_inner(&self) -> Vec<Vec<(BinningComponent, Vec<u8>)>> {
match self {
Filter::True => vec![vec![]],
Filter::All(filters) => {
let mut o = vec![vec![]];
for filter in filters {
let mut new_o = Vec::new();
for par in filter.get_bins_inner() {
for mut prev in o.clone() {
prev.extend(par.clone());
new_o.push(prev);
}
}
o = new_o;
}
o
}
Filter::Any(filters) => filters.iter().flat_map(|f| f.get_bins_inner()).collect(),
Filter::Match(path, value) => {
vec![vec![(BinningComponent::Match(path.to_owned()), {
let mut co = Vec::new();
write_value_with_len(value, &mut co);
co
})]]
}
Filter::Has(path) => {
vec![vec![(BinningComponent::Has(path.to_owned()), vec![])]]
}
}
}
}
pub fn write_value_with_len(value: &Value, out: &mut Vec<u8>) {
match value {
Value::Tag(tag) => {
out.extend(4u32.to_be_bytes());
out.extend(tag.0.to_be_bytes());
}
Value::U32(x) => {
out.extend(4u32.to_be_bytes());
out.extend(x.to_be_bytes());
}
Value::U64(x) => {
out.extend(8u32.to_be_bytes());
out.extend(x.to_be_bytes());
}
Value::I64(x) => {
out.extend(8u32.to_be_bytes());
out.extend(x.to_be_bytes());
}
Value::String(s) => {
out.extend((s.len() as u32).to_be_bytes());
out.extend(s.as_bytes());
}
Value::Binary(s) => {
out.extend((s.len() as u32).to_be_bytes());
out.extend(&**s);
}
}
}
#[cfg(test)]
mod test {
use jellyobject::{Path, Tag};
use crate::{
Filter,
kv::binning::{Binning, BinningComponent},
};
#[test]
fn all() {
let f = Filter::All(vec![
Filter::Has(Path(vec![Tag(0)])),
Filter::Has(Path(vec![Tag(1)])),
]);
let bins = vec![Binning(vec![
BinningComponent::Has(Path(vec![Tag(0)])),
BinningComponent::Has(Path(vec![Tag(1)])),
])];
assert_eq!(f.get_binnings(), bins)
}
#[test]
fn any() {
let f = Filter::Any(vec![
Filter::Has(Path(vec![Tag(0)])),
Filter::Has(Path(vec![Tag(1)])),
]);
let bins = vec![
Binning::new(vec![BinningComponent::Has(Path(vec![Tag(0)]))]),
Binning::new(vec![BinningComponent::Has(Path(vec![Tag(1)]))]),
];
assert_eq!(f.get_binnings(), bins)
}
#[test]
fn nested() {
let f = Filter::All(vec![
Filter::Any(vec![
Filter::Has(Path(vec![Tag(0)])),
Filter::Has(Path(vec![Tag(1)])),
]),
Filter::Any(vec![
Filter::Has(Path(vec![Tag(2)])),
Filter::Has(Path(vec![Tag(3)])),
]),
]);
let bins = vec![
Binning::new(vec![
BinningComponent::Has(Path(vec![Tag(0)])),
BinningComponent::Has(Path(vec![Tag(2)])),
]),
Binning::new(vec![
BinningComponent::Has(Path(vec![Tag(1)])),
BinningComponent::Has(Path(vec![Tag(2)])),
]),
Binning::new(vec![
BinningComponent::Has(Path(vec![Tag(0)])),
BinningComponent::Has(Path(vec![Tag(3)])),
]),
Binning::new(vec![
BinningComponent::Has(Path(vec![Tag(1)])),
BinningComponent::Has(Path(vec![Tag(3)])),
]),
];
assert_eq!(f.get_binnings(), bins)
}
}
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