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use std::{cmp::Ordering, num::NonZeroU32, ops::Range};
use crate::{Avltriee, AvltrieeAllocator, AvltrieeNode};
pub(crate) type Edge = (Option<NonZeroU32>, Ordering);
pub trait AvltrieeSearch<T, I: ?Sized, A: AvltrieeAllocator<T>>: AsRef<Avltriee<T, I, A>> {
fn cmp(left: &I, right: &I) -> Ordering;
fn value(&self, row: NonZeroU32) -> Option<&I>;
unsafe fn value_unchecked(&self, row: NonZeroU32) -> &I;
unsafe fn node_value_unchecked(&self, row: NonZeroU32) -> (&AvltrieeNode<T>, &I);
/// Search row of a value.
fn row(&self, value: &I) -> Option<NonZeroU32> {
let edge = self.edge(value);
(edge.1 == Ordering::Equal).then(|| edge.0).flatten()
}
/// Finds the edge of a node from the specified value.
fn edge(&self, value: &I) -> Edge {
let triee = self.as_ref();
let mut row: Option<NonZeroU32> = triee.root();
let mut ord = Ordering::Equal;
while let Some(row_inner) = row {
let (node, node_value) = unsafe { self.node_value_unchecked(row_inner) };
ord = Self::cmp(node_value, value);
match ord {
Ordering::Greater => {
if node.left.is_some() {
row = node.left;
} else {
break;
}
}
Ordering::Equal => {
break;
}
Ordering::Less => {
if node.right.is_some() {
row = node.right;
} else {
break;
}
}
}
}
(row, ord)
}
/// Search >= value.
fn ge(&self, value: &I) -> Option<NonZeroU32> {
let triee = self.as_ref();
let mut row = triee.root();
let mut keep = None;
while let Some(row_inner) = row {
let (node, node_value) = unsafe { self.node_value_unchecked(row_inner) };
match Self::cmp(node_value, value) {
Ordering::Greater => {
if node.left.is_some() {
keep = row;
row = node.left;
} else {
return row;
}
}
Ordering::Equal => {
return row;
}
Ordering::Less => {
if node.right.is_some() {
row = node.right;
} else {
break;
}
}
}
}
keep
}
/// Search <= value.
fn le(&self, value: &I) -> Option<NonZeroU32> {
let triee = self.as_ref();
let mut row = triee.root();
let mut keep = None;
while let Some(row_inner) = row {
let (node, node_value) = unsafe { self.node_value_unchecked(row_inner) };
match Self::cmp(node_value, value) {
Ordering::Greater => {
if node.left.is_some() {
row = node.left;
} else {
break;
}
}
Ordering::Equal => {
return row;
}
Ordering::Less => {
if node.right.is_some() {
keep = row;
row = node.right;
} else {
return row;
}
}
}
}
keep
}
/// Search > value.
fn gt(&self, value: &I) -> Option<NonZeroU32> {
let triee = self.as_ref();
let mut row = triee.root();
let mut keep = None;
while let Some(row_inner) = row {
let (node, node_value) = unsafe { self.node_value_unchecked(row_inner) };
match Self::cmp(node_value, value) {
Ordering::Greater => {
if node.left.is_some() {
keep = row;
row = node.left;
} else {
return row;
}
}
Ordering::Equal => {
if node.right.is_some() {
return triee.min(node.right);
}
if let Some(parent) = node.parent {
if unsafe { triee.node_unchecked(parent).left } == row {
return node.parent;
}
}
break;
}
Ordering::Less => {
if node.right.is_some() {
row = node.right;
} else {
break;
}
}
}
}
keep
}
/// Search < value.
fn lt(&self, value: &I) -> Option<NonZeroU32> {
let triee = self.as_ref();
let mut row = triee.root();
let mut keep = None;
while let Some(row_inner) = row {
let (node, node_value) = unsafe { self.node_value_unchecked(row_inner) };
match Self::cmp(node_value, value) {
Ordering::Greater => {
if node.left.is_some() {
row = node.left;
} else {
break;
}
}
Ordering::Equal => {
if node.left.is_some() {
return triee.max(node.left);
}
if let Some(parent) = node.parent {
if unsafe { triee.node_unchecked(parent) }.right == row {
return node.parent;
}
}
break;
}
Ordering::Less => {
if node.right.is_some() {
keep = row;
row = node.right;
} else {
return row;
}
}
}
}
keep
}
/// Search with range value with custom ord.
fn range(&self, start_value: &I, end_value: &I) -> Option<Range<NonZeroU32>> {
let triee = self.as_ref();
let mut row = triee.root();
let mut start = None;
while let Some(row_inner) = row {
let (node, node_value) = unsafe { self.node_value_unchecked(row_inner) };
match Self::cmp(node_value, start_value) {
Ordering::Greater => {
start = row;
if node.left.is_some() {
row = node.left;
} else {
break;
}
}
Ordering::Equal => {
start = row;
break;
}
Ordering::Less => {
if node.right.is_some() {
row = node.right;
} else {
break;
}
}
}
}
if let Some(start) = start {
if Self::cmp(unsafe { self.value_unchecked(start) }, end_value) != Ordering::Greater {
row = triee.root();
let mut end = None;
while let Some(row_inner) = row {
let (node, node_value) = unsafe { self.node_value_unchecked(row_inner) };
match Self::cmp(node_value, end_value) {
Ordering::Greater => {
if node.left.is_some() {
row = node.left;
} else {
break;
}
}
Ordering::Equal => {
end = row;
break;
}
Ordering::Less => {
end = row;
if node.right.is_some() {
row = node.right;
} else {
break;
}
}
}
}
if let Some(end) = end {
return Some(Range { start, end });
}
}
}
None
}
}