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Improved interval tree impl and add the ability to remove by id.

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Andrey Antukh 2016-06-11 18:30:06 +03:00
parent a01cbfa350
commit 461bdca375
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@ -4,11 +4,9 @@
* @author Andrey Antukh <niwi@niwi.nz>, 2016
* @license MIT License <https://opensource.org/licenses/MIT>
*/
"use strict";
goog.provide("intervaltree.core");
goog.provide("intervaltree.core.IntervalTree");
goog.require("goog.asserts");
goog.require("goog.array");
@ -16,6 +14,8 @@ goog.scope(function() {
const assert = goog.asserts.assert;
const every = goog.array.every;
const ID_SYM = Symbol.for("intervaltree.core:id-sym");
// --- Types Declaration
class Interval {
@ -43,38 +43,20 @@ goog.scope(function() {
class IntervalTree {
constructor() {
this.root = null;
}
add(item) {
// Coerce to interval
const interval = makeInterval(item);
const node = new Node(interval);
this.root = add(this.root, node);
return this;
}
remove(item) {
const interval = makeInterval(item)
this.root = remove(this.root, interval);
return this;
}
contains(point) {
assert(goog.isNumber(point));
assert(this.root !== null);
return contains(this.root, point);
}
search(item) {
const interval = makeInterval(item);
return search(this.root, interval);
this.byId = new Map();
}
}
// --- Private Api (Implementation)
function add(root, node) {
const nextId = (function() {
let counter = 0;
return function() {
return counter++;
};
})();
function addNode(root, node) {
if (root === null) {
return node;
}
@ -85,9 +67,9 @@ goog.scope(function() {
}
if (node.interval.start <= root.interval.start) {
root.left = add(root.left, node);
root.left = addNode(root.left, node);
} else {
root.right = add(root.right, node);
root.right = addNode(root.right, node);
}
root.maxEnd = calculateMaxEnd(root);
@ -115,11 +97,16 @@ goog.scope(function() {
return root;
}
function remove(root, interval) {
function removeInterval(root, index, interval) {
if (root === null) {
return root;
} else if (root.interval.start === interval.start &&
root.interval.end === interval.end) {
// Remove interval from the index.
const intervalId = root.interval[ID_SYM];
index.delete(intervalId);
if (root.left === null) {
return root.right;
} else if (root.right === null) {
@ -134,8 +121,8 @@ goog.scope(function() {
return newroot;
}
} else {
root.left = remove(root.left, interval);
root.right = remove(root.right, interval);
root.left = remove(root.left, index, interval);
root.right = remove(root.right, index, interval);
root.height = calculateHeight(root);
root.maxEnd = calculateMaxEnd(root);
@ -223,7 +210,7 @@ goog.scope(function() {
return y;
}
function contains(root, point) {
function containsPoint(root, point) {
if (root.interval.start <= point &&
root.interval.end >= point) {
return true;
@ -231,11 +218,11 @@ goog.scope(function() {
let result = false;
if (root.left && root.left.maxEnd >= point) {
result = result || contains(root.left, point);
result = result || containsPoint(root.left, point);
}
if (root.right && root.right.maxEnd >= point) {
result = result || contains(root.right, point);
result = result || containsPoint(root.right, point);
}
return result;
@ -249,8 +236,7 @@ goog.scope(function() {
(b.start <= a.end && b.end >= a.end));
}
function search(root, interval) {
console.log("1111");
function searchSingleInterval(root, interval) {
if (isIntervalIntersect(root.interval, interval)) {
return root.interval;
} else {
@ -268,9 +254,29 @@ goog.scope(function() {
}
}
// --- Public Api
function searchInterval(root, interval) {
const result = new Set();
function makeInterval(value) {
if (isIntervalIntersect(root.interval, interval)) {
result.add(root.interval);
}
if (root.left && root.left.maxEnd >= interval.start) {
for (let item of searchMany(root.left, interval)) {
result.add(item);
}
}
if (root.right && root.right.maxEnd >= interval.start) {
for (let item of searchMany(root.right, interval)) {
result.add(item);
}
}
return result;
}
function createInterval(value) {
if (value instanceof Interval) {
return value
} else if (goog.isArray(value)) {
@ -301,10 +307,12 @@ goog.scope(function() {
}
};
function makeTree(items) {
// --- Public Api
function create(items) {
const tree = new IntervalTree();
if (goog.isArrayLike(items)) {
if (goog.isArray(items)) {
for(let item of items) {
tree.add(item);
}
@ -313,18 +321,77 @@ goog.scope(function() {
return tree;
}
const module = intervaltree.core;
function add(tree, id, item) {
assert(tree instanceof IntervalTree);
// Types
module.IntervalTree = IntervalTree;
module.Interval = Interval;
module.Node = Node;
if (id && !item) {
item = id;
id = nextId();
}
// Constructors
module.interval = makeInterval;
module.create = makeTree;
// Coerce to interval
const interval = createInterval(item);
const node = new Node(interval);
interval[ID_SYM] = id;
tree.byId.set(id, interval);
tree.root = addNode(tree.root, node);
return tree;
}
function clear(tree) {
assert(tree instanceof IntervalTree);
this.root = null;
this.byId.clear();
}
function remove(tree, item) {
assert(tree instanceof IntervalTree);
const interval = createInterval(item);
tree.root = removeInterval(tree.root, tree.byId, interval);
return tree;
}
function removeById(tree, id) {
assert(tree instanceof IntervalTree);
if (tree.byId.has(id)) {
const interval = this.byId.get(id);
remove(tree, interval);
}
}
function contains(tree, point) {
assert(tree instanceof IntervalTree);
assert(goog.isNumber(point));
return containsPoint(tree.root, point);
}
function search(tree, item) {
assert(tree instanceof IntervalTree);
const interval = createInterval(item);
return Array.from(searchInterval(tree.root, interval));
}
function searchSingle(tree, item) {
assert(tree instanceof IntervalTree);
const interval = createInterval(item);
return searchSingleInterval(tree.root, interval);
}
// Api
intervaltree.core.create = create;
intervaltree.core.add = add;
intervaltree.core.remove = remove;
intervaltree.core.removeById = removeById;
intervaltree.core.contains = contains;
intervaltree.core.search = search;
intervaltree.core.searchSingle = searchSingle;
// Test
module.test = function() {
// const util = require('util');
@ -334,21 +401,22 @@ goog.scope(function() {
[10,14], [-10, 1], [9, 22],
]);
console.timeEnd("init");
console.dir(tree, { depth: 5});
const n = 6;
console.time("search")
console.log("result to", n, "=>", tree.search(n));
console.timeEnd("search")
const n = 2;
console.time("search");
console.log("SEARCH***********************************");
console.log(`RESULT searchMany(${n}):`);
console.log(tree.searchMany(n));
console.timeEnd("search");
console.time("remove");
// tree.remove([4,9]);
tree.remove([9, 22]);
// // tree.remove([4,9]);
// tree.remove([9, 22]);
tree.remove([-10, 1]);
console.dir(tree, { depth: 5});
console.timeEnd("remove");
// console.dir(tree, { depth: 5});
};
});