compound-binary-file-js
Version:
This is an implementation of [Compound Binary File v.3](https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-cfb/53989ce4-7b05-4f8d-829b-d08d6148375b) \ Allows reading existing files, creation of the/write operation
209 lines • 8.77 kB
JavaScript
"use strict";
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
var UpdateHandler_1 = require("./UpdateHandler");
var Node_1 = require("./Node");
var DeleteHandler = /** @class */ (function (_super) {
__extends(DeleteHandler, _super);
function DeleteHandler(tree, comparator) {
var _this = _super.call(this, tree) || this;
_this.comparator = comparator;
return _this;
}
DeleteHandler.prototype.delete = function (node) {
if (!node.hasChildren()) {
if (this.tree.isRoot(node)) {
this.tree.setRoot(null);
}
else {
if (node.getColor() === Node_1.Color.BLACK) {
var sibling = node.sibling();
node.getParent().deleteChild(node);
this.recover(sibling);
}
else {
node.getParent().deleteChild(node);
}
}
}
else if (node.hasTwoChildren()) {
var substituteWith = this.inOrderPredecessor(node);
this.swap(node, substituteWith);
this.delete(node);
}
else {
var substituteWith = void 0;
if (node.getRightChild() == null) {
substituteWith = node.getLeftChild();
}
else {
substituteWith = node.getRightChild();
}
if (this.tree.isRoot(node)) {
this.tree.setRoot(substituteWith);
substituteWith.setColor(Node_1.Color.BLACK);
}
else if (substituteWith.getColor() === Node_1.Color.RED || node.getColor() === Node_1.Color.RED) {
node.getParent().substituteNode(node, substituteWith);
substituteWith.setColor(Node_1.Color.BLACK);
}
else {
var sibling = node.sibling();
node.getParent().substituteNode(node, substituteWith);
this.recover(sibling);
}
}
};
DeleteHandler.prototype.inOrderPredecessor = function (node) {
var _this = this;
if (node.getLeftChild() == null) {
return null;
}
else {
var allChildren = node.getLeftChild().getChildrenRecursive();
allChildren.push(node.getLeftChild());
allChildren.sort(function (a, b) { return _this.comparator(a.getValue(), b.getValue()); });
return allChildren[allChildren.length - 1];
}
};
DeleteHandler.prototype.recover = function (sibling) {
var siblingColor = sibling.getColor();
var siblingsLeftChild = sibling.getLeftChild();
var siblingsRightChild = sibling.getRightChild();
var siblingLeftChildColor = siblingsLeftChild == null ? Node_1.Color.BLACK : siblingsLeftChild.getColor();
var siblingRightChildColor = siblingsRightChild == null ? Node_1.Color.BLACK : siblingsRightChild.getColor();
var isSiblingLeftChild = sibling.getParent().isLeftChild(sibling);
if (siblingColor === Node_1.Color.BLACK) {
if (siblingLeftChildColor === Node_1.Color.RED || siblingRightChildColor === Node_1.Color.RED) {
if (sibling.getParent().isLeftChild(sibling)) {
if (siblingLeftChildColor === Node_1.Color.RED) {
this.rightRotate(sibling.getParent(), sibling);
siblingsLeftChild.setColor(Node_1.Color.BLACK);
}
else {
this.leftRotate(sibling, sibling.getRightChild());
this.rightRotate(sibling.grandParent(), sibling.getParent());
sibling.setColor(Node_1.Color.BLACK);
}
}
else {
if (siblingRightChildColor === Node_1.Color.RED) {
this.leftRotate(sibling.getParent(), sibling);
siblingsRightChild.setColor(Node_1.Color.BLACK);
}
else {
this.rightRotate(sibling, sibling.getLeftChild());
this.leftRotate(sibling.grandParent(), sibling.getParent());
sibling.setColor(Node_1.Color.BLACK);
}
}
}
else {
sibling.setColor(Node_1.Color.RED);
var parent_1 = sibling.getParent();
if (parent_1.getColor() === Node_1.Color.BLACK && !this.tree.isRoot(parent_1)) {
this.recover(parent_1.sibling());
}
else {
parent_1.setColor(Node_1.Color.BLACK);
}
}
}
else {
var parent_2 = sibling.getParent();
var newSibling = void 0;
sibling.setColor(Node_1.Color.BLACK);
parent_2.setColor(Node_1.Color.RED);
if (isSiblingLeftChild) {
newSibling = sibling.getRightChild();
this.rightRotate(sibling.getParent(), sibling);
}
else {
newSibling = sibling.getLeftChild();
this.leftRotate(sibling.getParent(), sibling);
}
this.recover(newSibling);
}
};
DeleteHandler.prototype.swap = function (node1, node2) {
if (node1.getParent() === node2) {
this.swapChildParent(node2, node1);
}
else if (node2.getParent() === node1) {
this.swapChildParent(node1, node2);
}
else {
var node1Parent = node1.getParent();
var node1LeftChild = node1.getLeftChild();
var node1RightChild = node1.getRightChild();
var node2Parent = node2.getParent();
var node2LeftChild = node2.getLeftChild();
var node2RightChild = node2.getRightChild();
var node1Color = node1.getColor();
var node2Color = node2.getColor();
node1.setLeftChild(node2LeftChild);
node1.setRightChild(node2RightChild);
node2.setLeftChild(node1LeftChild);
node2.setRightChild(node1RightChild);
node1.setColor(node2Color);
node2.setColor(node1Color);
if (node1Parent == null) {
this.tree.setRoot(node2);
}
else {
node1Parent.substituteNode(node1, node2);
}
if (node2Parent == null) {
this.tree.setRoot(node1);
}
else {
node2Parent.substituteNode(node2, node1);
}
}
};
DeleteHandler.prototype.swapChildParent = function (parent, child) {
var parentColor = parent.getColor();
var childColor = child.getColor();
var leftGrandChild = child.getLeftChild();
var rightGrandChild = child.getRightChild();
var grandParent = parent.getParent();
if (grandParent == null) {
this.tree.setRoot(child);
}
else if (grandParent.isLeftChild(parent)) {
grandParent.setLeftChild(child);
}
else {
grandParent.setRightChild(child);
}
if (parent.isLeftChild(child)) {
var rightChild = parent.getRightChild();
child.setLeftChild(parent);
child.setRightChild(rightChild);
}
else {
var leftChild = parent.getLeftChild();
child.setRightChild(parent);
child.setLeftChild(leftChild);
}
child.setColor(parentColor);
parent.setLeftChild(leftGrandChild);
parent.setRightChild(rightGrandChild);
parent.setColor(childColor);
};
return DeleteHandler;
}(UpdateHandler_1.UpdateHandler));
exports.DeleteHandler = DeleteHandler;
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