841 行
25 KiB
JavaScript
841 行
25 KiB
JavaScript
// Copyright 2016 David Galles, University of San Francisco. All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without modification, are
|
|
// permitted provided that the following conditions are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright notice, this list of
|
|
// conditions and the following disclaimer.
|
|
//
|
|
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
|
// of conditions and the following disclaimer in the documentation and/or other materials
|
|
// provided with the distribution.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY David Galles ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
// WARRANTIES, INCLUDING, BUT NOT LIIBTED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
|
|
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
//
|
|
// The views and conclusions contained in the software and documentation are those of the
|
|
// authors and should not be interpreted as representing official policies, either expressed
|
|
// or implied, of the University of San Francisco
|
|
|
|
|
|
// Constants.
|
|
|
|
|
|
RadixTree.NODE_WIDTH = 60;
|
|
|
|
RadixTree.LINK_COLOR = "#007700";
|
|
RadixTree.HIGHLIGHT_CIRCLE_COLOR = "#007700";
|
|
RadixTree.FOREGROUND_COLOR = "#007700";
|
|
RadixTree.BACKGROUND_COLOR = "#CCFFCC";
|
|
RadixTree.PRINT_COLOR = RadixTree.FOREGROUND_COLOR;
|
|
RadixTree.FALSE_COLOR = "#FFFFFF"
|
|
RadixTree.WIDTH_DELTA = 50;
|
|
RadixTree.HEIGHT_DELTA = 80;
|
|
RadixTree.STARTING_Y = 80;
|
|
RadixTree.LeftMargin = 300;
|
|
RadixTree.NEW_NODE_Y = 100
|
|
RadixTree.NEW_NODE_X = 50;
|
|
RadixTree.FIRST_PRINT_POS_X = 50;
|
|
RadixTree.PRINT_VERTICAL_GAP = 20;
|
|
RadixTree.PRINT_HORIZONTAL_GAP = 50;
|
|
|
|
|
|
|
|
function RadixTree(am, w, h)
|
|
{
|
|
this.init(am, w, h);
|
|
}
|
|
|
|
RadixTree.prototype = new Algorithm();
|
|
RadixTree.prototype.constructor = RadixTree;
|
|
RadixTree.superclass = Algorithm.prototype;
|
|
|
|
RadixTree.prototype.init = function(am, w, h)
|
|
{
|
|
var sc = RadixTree.superclass;
|
|
this.startingX = w / 2;
|
|
this.first_print_pos_y = h - 2 * RadixTree.PRINT_VERTICAL_GAP;
|
|
this.print_max = w - 10;
|
|
|
|
var fn = sc.init;
|
|
fn.call(this,am);
|
|
this.addControls();
|
|
this.nextIndex = 0;
|
|
this.commands = [];
|
|
this.cmd("CreateLabel", 0, "", 20, 10, 0);
|
|
this.cmd("CreateLabel", 1, "", 20, 10, 0);
|
|
this.cmd("CreateLabel", 2, "", 20, 30, 0);
|
|
this.nextIndex = 3;
|
|
this.animationManager.StartNewAnimation(this.commands);
|
|
this.animationManager.skipForward();
|
|
this.animationManager.clearHistory();
|
|
}
|
|
|
|
|
|
|
|
RadixTree.prototype.findIndexDifference = function(s1, s2, id, wordIndex)
|
|
{
|
|
var index = 0;
|
|
this.cmd("SetText", 2, "Comparing next letter in search term \n to next letter in prefix of current node");
|
|
|
|
while (index < s1.length && index < s2.length)
|
|
{
|
|
this.cmd("SetHighlightIndex", 1, index);
|
|
this.cmd("SetHighlightIndex", id, index);
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlightIndex", 1, -1);
|
|
this.cmd("SetHighlightIndex", id, -1);
|
|
|
|
if (s1.charAt(index) == s2.charAt(index))
|
|
{
|
|
index++;
|
|
}
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
return index;
|
|
}
|
|
|
|
|
|
RadixTree.prototype.addControls = function()
|
|
{
|
|
this.insertField = addControlToAlgorithmBar("Text", "");
|
|
this.insertField.onkeypress = this.returnSubmit(this.insertField, this.insertCallback.bind(this), 12,false);
|
|
this.insertButton = addControlToAlgorithmBar("Button", "添加");
|
|
this.insertButton.onclick = this.insertCallback.bind(this);
|
|
this.deleteField = addControlToAlgorithmBar("Text", "");
|
|
this.deleteField.onkeydown = this.returnSubmit(this.deleteField, this.deleteCallback.bind(this), 12);
|
|
this.deleteButton = addControlToAlgorithmBar("Button", "删除");
|
|
this.deleteButton.onclick = this.deleteCallback.bind(this);
|
|
this.findField = addControlToAlgorithmBar("Text", "");
|
|
this.findField.onkeydown = this.returnSubmit(this.findField, this.findCallback.bind(this), 12);
|
|
this.findButton = addControlToAlgorithmBar("Button", "搜索");
|
|
this.findButton.onclick = this.findCallback.bind(this);
|
|
this.printButton = addControlToAlgorithmBar("Button", "打印");
|
|
this.printButton.onclick = this.printCallback.bind(this);
|
|
}
|
|
|
|
RadixTree.prototype.reset = function()
|
|
{
|
|
this.nextIndex = 3;
|
|
this.root = null;
|
|
}
|
|
|
|
RadixTree.prototype.insertCallback = function(event)
|
|
{
|
|
var insertedValue = this.insertField.value.toUpperCase()
|
|
insertedValue = insertedValue.replace(/[^a-z]/gi,'');
|
|
|
|
if (insertedValue != "")
|
|
{
|
|
// set text value
|
|
this.insertField.value = "";
|
|
this.implementAction(this.add.bind(this), insertedValue);
|
|
}
|
|
}
|
|
|
|
RadixTree.prototype.deleteCallback = function(event)
|
|
{
|
|
var deletedValue = this.deleteField.value.toUpperCase();
|
|
deletedValue = deletedValue.replace(/[^a-z]/gi,'');
|
|
if (deletedValue != "")
|
|
{
|
|
this.deleteField.value = "";
|
|
this.implementAction(this.deleteElement.bind(this),deletedValue);
|
|
}
|
|
}
|
|
|
|
|
|
RadixTree.prototype.printCallback = function(event)
|
|
{
|
|
this.implementAction(this.printTree.bind(this),"");
|
|
}
|
|
|
|
|
|
|
|
RadixTree.prototype.printTree = function(unused)
|
|
{
|
|
|
|
this.commands = [];
|
|
|
|
if (this.root != null)
|
|
{
|
|
this.highlightID = this.nextIndex++;
|
|
this.printLabel1 = this.nextIndex++;
|
|
this.printLabel2 = this.nextIndex++;
|
|
var firstLabel = this.nextIndex++;
|
|
this.cmd("CreateLabel", firstLabel, "Output: ", RadixTree.FIRST_PRINT_POS_X, this.first_print_pos_y);
|
|
this.cmd("CreateHighlightCircle", this.highlightID, RadixTree.HIGHLIGHT_CIRCLE_COLOR, this.root.x, this.root.y);
|
|
this.cmd("SetWidth", this.highlightID, RadixTree.NODE_WIDTH);
|
|
this.cmd("CreateLabel", this.printLabel1, "Current String: ", 20, 10, 0);
|
|
this.cmd("CreateLabel", this.printLabel2, "", 20, 10, 0);
|
|
this.cmd("AlignRight", this.printLabel2, this.printLabel1);
|
|
this.xPosOfNextLabel = RadixTree.FIRST_PRINT_POS_X;
|
|
this.yPosOfNextLabel = this.first_print_pos_y;
|
|
this.printTreeRec(this.root, "");
|
|
|
|
// this.cmd("SetText", this.printLabel1, "About to delete");
|
|
// this.cmd("Step")
|
|
|
|
this.cmd("Delete", this.highlightID);
|
|
this.cmd("Delete", this.printLabel1);
|
|
this.cmd("Delete", this.printLabel2);
|
|
this.cmd("Step")
|
|
|
|
for (var i = firstLabel; i < this.nextIndex; i++)
|
|
{
|
|
this.cmd("Delete", i);
|
|
}
|
|
this.nextIndex = this.highlightID; /// Reuse objects. Not necessary.
|
|
}
|
|
return this.commands;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
RadixTree.prototype.printTreeRec = function(tree, stringSoFar)
|
|
{
|
|
if (tree.wordRemainder != "")
|
|
{
|
|
stringSoFar = stringSoFar + tree.wordRemainder;
|
|
var nextLabelID = this.nextIndex++;
|
|
this.cmd("CreateLabel", nextLabelID, tree.wordRemainder, tree.x, tree.y, 0);
|
|
this.cmd("MoveToAlignRight", nextLabelID, this.printLabel2);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", nextLabelID);
|
|
this.nextIndex--;
|
|
this.cmd("SetText", this.printLabel2, stringSoFar);
|
|
}
|
|
if (tree.isword)
|
|
{
|
|
var nextLabelID = this.nextIndex++;
|
|
this.cmd("CreateLabel", nextLabelID, stringSoFar + " ", 20, 10, 0);
|
|
this.cmd("SetForegroundColor", nextLabelID, RadixTree.PRINT_COLOR);
|
|
this.cmd("AlignRight", nextLabelID, this.printLabel1, RadixTree.PRINT_COLOR);
|
|
this.cmd("MoveToAlignRight", nextLabelID, nextLabelID - 1);
|
|
this.cmd("Step");
|
|
|
|
this.xPosOfNextLabel += RadixTree.PRINT_HORIZONTAL_GAP;
|
|
if (this.xPosOfNextLabel > this.print_max)
|
|
{
|
|
this.xPosOfNextLabel = RadixTree.FIRST_PRINT_POS_X;
|
|
this.yPosOfNextLabel += RadixTree.PRINT_VERTICAL_GAP;
|
|
}
|
|
|
|
|
|
}
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
if (tree.children[i] != null)
|
|
{
|
|
this.cmd("Move", this.highlightID, tree.children[i].x, tree.children[i].y);
|
|
this.cmd("Step");
|
|
this.printTreeRec(tree.children[i], stringSoFar);
|
|
this.cmd("Move", this.highlightID, tree.x, tree.y);
|
|
this.cmd("SetText", this.printLabel2, stringSoFar);
|
|
this.cmd("Step");
|
|
|
|
}
|
|
|
|
|
|
}
|
|
}
|
|
|
|
RadixTree.prototype.findCallback = function(event)
|
|
{
|
|
var findValue;
|
|
|
|
var findValue = this.insertField.value.toUpperCase()
|
|
findValue = findValue.replace(/[^a-z]/gi,'');
|
|
this.findField.value = "";
|
|
|
|
this.implementAction(this.findElement.bind(this),findValue);
|
|
}
|
|
|
|
RadixTree.prototype.findElement = function(findValue)
|
|
{
|
|
this.commands = [];
|
|
this.cmd("SetText", 0, "Seaching for: ");
|
|
this.cmd("SetText", 1, findValue);
|
|
this.cmd("AlignRight", 1, 0);
|
|
this.cmd("Step");
|
|
this.highlightID = this.nextIndex++;
|
|
|
|
|
|
var res = this.doFind(this.root, findValue);
|
|
if (res)
|
|
{
|
|
this.cmd("SetText", 0, "String " + findValue + " found");
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "String " + findValue + " 未找到");
|
|
}
|
|
this.cmd("SetText", 1, "");
|
|
this.cmd("SetText", 2, "");
|
|
|
|
|
|
return this.commands;
|
|
}
|
|
|
|
|
|
RadixTree.prototype.doFind = function(tree, value)
|
|
{
|
|
if (tree == null)
|
|
{
|
|
this.cmd("SetText", 2, "Empty tree found. String not in the tree");
|
|
this.cmd("step");
|
|
return null;
|
|
}
|
|
|
|
this.cmd("SetHighlight", tree.graphicID , 1);
|
|
|
|
var remain = tree.wordRemainder
|
|
|
|
var indexDifference = this.findIndexDifference(value, remain, tree.graphicID, 0);
|
|
|
|
if (indexDifference == remain.length)
|
|
{
|
|
this.cmd("SetText", 2, "Reached the end of the prefix stored at this node");
|
|
this.cmd("Step");
|
|
|
|
if (value.length > indexDifference)
|
|
{
|
|
this.cmd("SetText", 2, "Recusively search remaining string \nin the '" +value.charAt(indexDifference) + "' child");
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", tree.graphicID , 0);
|
|
this.cmd("SetText", 1, value.substring(indexDifference));
|
|
|
|
var index = value.charCodeAt(indexDifference) - "A".charCodeAt(0);
|
|
var noChild = tree.children[index] == null;
|
|
|
|
|
|
if (noChild)
|
|
{
|
|
this.cmd("SetText", 2, "Child '" +value.charAt(indexDifference) + "' does not exit. \nString is not in the tree.");
|
|
this.cmd("Step");
|
|
return null;
|
|
|
|
} else {
|
|
|
|
|
|
this.cmd("CreateHighlightCircle", this.highlightID, RadixTree.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
|
|
this.cmd("SetWidth", this.highlightID, RadixTree.NODE_WIDTH);
|
|
|
|
this.cmd("Step")
|
|
this.cmd("Move", this.highlightID, tree.children[index].x, tree.children[index].y);
|
|
this.cmd("Step")
|
|
|
|
this.cmd("Delete", this.highlightID);
|
|
|
|
}
|
|
|
|
|
|
return this.doFind(tree.children[index], value.substring(indexDifference));
|
|
}
|
|
|
|
this.cmd("SetText", 2, "Reached the end of the string. Check if current node is \"True\"")
|
|
this.cmd("Step");
|
|
this.cmd("SetText", 2, "")
|
|
|
|
if (tree.isword)
|
|
{
|
|
this.cmd("SetText", 2, "Node is \"True\", string is in tree")
|
|
this.cmd("Step");
|
|
this.cmd("SetText", 2, "")
|
|
this.cmd("SetHighlight", tree.graphicID , 0);
|
|
return tree;
|
|
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 2, "Node is \"False\", string is not in tree")
|
|
this.cmd("Step");
|
|
this.cmd("SetText", 2, "")
|
|
this.cmd("SetHighlight", tree.graphicID , 0);
|
|
return null;
|
|
|
|
}
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 2, "Reached end of search string, \nStill characters remaining at node\nString not in tree")
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", tree.graphicID , 0);
|
|
this.cmd("SetText", 2, "")
|
|
return null;
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
RadixTree.prototype.deleteElement = function(deletedValue)
|
|
{
|
|
this.commands = [];
|
|
this.cmd("SetText", 0, "正在刪除： ");
|
|
this.cmd("SetText", 1, deletedValue);
|
|
this.cmd("AlignRight", 1, 0);
|
|
|
|
var node = this.doFind(this.root, deletedValue);
|
|
|
|
if (node == null)
|
|
{
|
|
this.cmd("SetText", 2, "String not in the tree, nothing to delete");
|
|
this.cmd("Step");
|
|
this.cmd("SetText", 0, "");
|
|
this.cmd("SetText", 1, "");
|
|
this.cmd("SetText", 2, "");
|
|
}
|
|
else
|
|
{
|
|
node.isword = false;
|
|
this.cmd("SetText", 2, "Found string to delete, setting node to \"False\"");
|
|
this.cmd("Step");
|
|
this.cmd("SetBackgroundColor", node.graphicID, RadixTree.FALSE_COLOR);
|
|
this.cmd("Step");
|
|
this.cleanupAfterDelete(node)
|
|
this.cmd("SetText", 0, "");
|
|
this.cmd("SetText", 1, "");
|
|
this.cmd("SetText", 2, "");
|
|
}
|
|
|
|
return this.commands;
|
|
}
|
|
|
|
|
|
|
|
RadixTree.prototype.numChildren = function(tree)
|
|
{
|
|
if (tree == null)
|
|
{
|
|
return 0;
|
|
}
|
|
var children = 0
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
if (tree.children[i] != null)
|
|
{
|
|
children++;
|
|
}
|
|
}
|
|
return children;
|
|
|
|
}
|
|
|
|
|
|
RadixTree.prototype.isLeaf = function(tree)
|
|
{
|
|
if (tree == null)
|
|
{
|
|
return false;
|
|
}
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
if (tree.children[i] != null)
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
RadixTree.prototype.getParentIndex = function(tree)
|
|
{
|
|
if (tree.parent == null)
|
|
{
|
|
return -1;
|
|
}
|
|
var par = tree.parent;
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
if (par.children[i] == tree)
|
|
{
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
RadixTree.prototype.cleanupAfterDelete = function(tree)
|
|
{
|
|
var children = this.numChildren(tree)
|
|
|
|
if (children == 0 && !tree.isword)
|
|
{
|
|
this.cmd("SetText", 2, "Deletion left us with a \"False\" leaf\nRemoving false leaf");
|
|
this.cmd("SetHighlight" ,tree.graphicID , 1);
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", tree.graphicID , 0);
|
|
if (tree.parent != null)
|
|
{
|
|
var index = 0
|
|
while (tree.parent.children[index] != tree)
|
|
{
|
|
index++;
|
|
}
|
|
this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
|
|
this.cmd("Delete", tree.graphicID , 0);
|
|
tree.parent.children[index] = null;
|
|
this.cleanupAfterDelete(tree.parent);
|
|
}
|
|
else
|
|
{
|
|
this.cmd("Delete", tree.graphicID , 0);
|
|
this.root = null;
|
|
}
|
|
}
|
|
else if (children == 1 && !tree.isword)
|
|
{
|
|
var childIndex = -1;
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
if (tree.children[i] != null)
|
|
{
|
|
childIndex = i;
|
|
break;
|
|
}
|
|
}
|
|
this.cmd("SetText", 2, "Deletion left us with a \"False\" node\nContaining one child. Combining ...");
|
|
this.cmd("SetHighlight" ,tree.graphicID , 1);
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", tree.graphicID , 0);
|
|
|
|
var child = tree.children[childIndex];
|
|
child.wordRemainder = tree.wordRemainder + child.wordRemainder;
|
|
this.cmd("SetText", child.graphicID, child.wordRemainder);
|
|
this.cmd("Disconnect", tree.graphicID , child.graphicID);
|
|
|
|
if (tree.parent == null)
|
|
{
|
|
child.parent = null
|
|
this.root = child;
|
|
this.cmd("Delete", tree.graphicID);
|
|
}
|
|
else
|
|
{
|
|
var parIndex = this.getParentIndex(tree);
|
|
this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
|
|
tree.parent.children[parIndex] = child;
|
|
child.parent = tree.parent
|
|
this.cmd("Connect", tree.parent.graphicID, child.graphicID, RadixTree.FOREGROUND_COLOR, 0, false, child.wordRemainder.charAt(0));
|
|
this.cmd("Delete", tree.graphicID);
|
|
|
|
}
|
|
this.resizeTree();
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
RadixTree.prototype.treeDelete = function(tree, valueToDelete)
|
|
{
|
|
|
|
}
|
|
|
|
RadixTree.prototype.resizeTree = function()
|
|
{
|
|
this.resizeWidths(this.root);
|
|
if (this.root != null)
|
|
{
|
|
var startingPoint = this.root.width / 2 + 1 + RadixTree.LeftMargin;
|
|
this.setNewPositions(this.root, startingPoint, RadixTree.STARTING_Y);
|
|
this.animateNewPositions(this.root);
|
|
this.cmd("Step");
|
|
}
|
|
|
|
}
|
|
|
|
|
|
RadixTree.prototype.add = function(word)
|
|
{
|
|
this.commands = new Array();
|
|
this.cmd("SetText", 0, "Inserting; ");
|
|
this.cmd("SetText", 1, word);
|
|
this.cmd("AlignRight", 1, 0);
|
|
this.cmd("Step");
|
|
this.highlightID = this.nextIndex++;
|
|
this.root = this.addR(word.toUpperCase(), this.root, RadixTree.LEFT_MARGIN + RadixTree.NODE_WIDTH / 2 + 1, RadixTree.STARTING_Y, 0);
|
|
this.resizeTree();
|
|
this.cmd("SetText", 0, "");
|
|
this.cmd("SetText", 1, "");
|
|
|
|
return this.commands;
|
|
}
|
|
|
|
|
|
RadixTree.prototype.addR = function(s, rt, startX, startY, wordIndex)
|
|
{
|
|
if (rt == null)
|
|
{
|
|
this.cmd("CreateCircle", this.nextIndex, s, RadixTree.NEW_NODE_X, RadixTree.NEW_NODE_Y);
|
|
this.cmd("SetForegroundColor", this.nextIndex, RadixTree.FOREGROUND_COLOR);
|
|
this.cmd("SetBackgroundColor", this.nextIndex, RadixTree.BACKGROUND_COLOR);
|
|
this.cmd("SetWidth", this.nextIndex, RadixTree.NODE_WIDTH);
|
|
this.cmd("SetText", 2, "Reached an empty tree. Creating a node containing " + s);
|
|
this.cmd("Step");
|
|
this.cmd("SetText", 2, "" );
|
|
rt = new RadixNode(s, this.nextIndex, startX, startY)
|
|
this.nextIndex += 1;
|
|
rt.isword = true;
|
|
return rt;
|
|
}
|
|
|
|
this.cmd("SetHighlight", rt.graphicID , 1);
|
|
|
|
|
|
|
|
|
|
var indexDifference = this.findIndexDifference(s, rt.wordRemainder, rt.graphicID, wordIndex);
|
|
|
|
// this.cmd("CreateHighlightCircle", this.highlightID, BST.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
|
|
// this.cmd("Move", this.highlightID, tree.left.x, tree.left.y);
|
|
// this.cmd("Step");
|
|
|
|
|
|
|
|
if (indexDifference == rt.wordRemainder.length)
|
|
{
|
|
|
|
this.cmd("SetText", 2, "Reached the end of the prefix stored at this node");
|
|
this.cmd("Step");
|
|
|
|
if (s.length > indexDifference)
|
|
{
|
|
this.cmd("SetText", 2, "Recusively insert remaining string \ninto the '" +s.charAt(indexDifference) + "' child");
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", rt.graphicID , 0);
|
|
this.cmd("SetText", 1, s.substring(indexDifference));
|
|
|
|
|
|
|
|
// TODO: HIGHLIGHT CIRCLE!
|
|
|
|
var index = s.charCodeAt(indexDifference) - "A".charCodeAt(0);
|
|
var noChild = rt.children[index] == null;
|
|
|
|
|
|
if (noChild)
|
|
{
|
|
this.cmd("SetText", 2, "Child '" +s.charAt(indexDifference) + "' does not exit. Creating ...");
|
|
this.cmd("Step");
|
|
|
|
} else {
|
|
|
|
|
|
this.cmd("CreateHighlightCircle", this.highlightID, RadixTree.HIGHLIGHT_CIRCLE_COLOR, rt.x, rt.y);
|
|
this.cmd("SetWidth", this.highlightID, RadixTree.NODE_WIDTH);
|
|
|
|
this.cmd("Step")
|
|
this.cmd("Move", this.highlightID, rt.children[index].x, rt.children[index].y);
|
|
this.cmd("Step")
|
|
|
|
this.cmd("Delete", this.highlightID);
|
|
// DO HIGHILIGHT CIRCLE THING HERE
|
|
}
|
|
|
|
|
|
var connect = rt.children[index] == null;
|
|
rt.children[index] = this.addR(s.substring(indexDifference), rt.children[index], rt.x, rt.y, wordIndex+indexDifference);
|
|
rt.children[index].parent = rt;
|
|
if (connect)
|
|
{
|
|
this.cmd("Connect", rt.graphicID, rt.children[index].graphicID, RadixTree.FOREGROUND_COLOR, 0, false, s.charAt(indexDifference));
|
|
}
|
|
return rt;
|
|
}
|
|
this.cmd("SetText", 2, "Reached the end of the string. Set Current node to \"True\"")
|
|
this.cmd("Step");
|
|
this.cmd("SetText", 2, "")
|
|
|
|
this.cmd("SetBackgroundColor", rt.graphicID, RadixTree.BACKGROUND_COLOR);
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", rt.graphicID , 0);
|
|
|
|
rt.isword = true;
|
|
return rt;
|
|
}
|
|
|
|
var firstRemainder = rt.wordRemainder.substring(0, indexDifference);
|
|
var secondRemainder = rt.wordRemainder.substring(indexDifference);
|
|
|
|
this.cmd("SetText", 2, "Reached a mismatch in prefix. \nCreate a new node with common prefix")
|
|
|
|
this.cmd("CreateCircle", this.nextIndex, firstRemainder, RadixTree.NEW_NODE_X, RadixTree.NEW_NODE_Y);
|
|
this.cmd("SetForegroundColor", this.nextIndex, RadixTree.FOREGROUND_COLOR);
|
|
this.cmd("SetBackgroundColor", this.nextIndex, RadixTree.FALSE_COLOR);
|
|
this.cmd("SetWidth", this.nextIndex, RadixTree.NODE_WIDTH);
|
|
this.cmd("Step")
|
|
|
|
var newNode = new RadixNode(firstRemainder, this.nextIndex, 0, 0);
|
|
this.nextIndex += 1;
|
|
|
|
newNode.wordRemainder = firstRemainder;
|
|
|
|
var index = rt.wordRemainder.charCodeAt(indexDifference) - "A".charCodeAt(0);
|
|
newNode.parent = rt.parent;
|
|
newNode.children[index] = rt;
|
|
if (rt.parent != null)
|
|
{
|
|
|
|
this.cmd("Disconnect", rt.parent.graphicID, rt.graphicID);
|
|
this.cmd("Connect", rt.parent.graphicID, newNode.graphicID, RadixTree.FOREGROUND_COLOR, 0, false, newNode.wordRemainder.charAt(0));
|
|
var childIndex = newNode.wordRemainder.charCodeAt(0) - 'A'.charCodeAt(0);
|
|
rt.parent.children[childIndex] = newNode;
|
|
rt.parent = newNode;
|
|
|
|
}
|
|
else
|
|
{
|
|
this.root = newNode;
|
|
}
|
|
this.cmd("SetHighlight", rt.graphicID, 0);
|
|
|
|
rt.parent = newNode;
|
|
|
|
this.cmd("SetText", 2, "Connect new node to the old, and reset prefix stored at previous node");
|
|
|
|
this.cmd("Connect", newNode.graphicID, newNode.children[index].graphicID, RadixTree.FOREGROUND_COLOR, 0, false, rt.wordRemainder.charAt(indexDifference));
|
|
rt.wordRemainder = secondRemainder;
|
|
this.cmd("SetText", rt.graphicID, rt.wordRemainder);
|
|
this.cmd("Step");
|
|
|
|
|
|
|
|
this.resizeTree();
|
|
|
|
if (indexDifference == s.length)
|
|
{
|
|
newNode.isword = true;
|
|
this.cmd("SetBackgroundColor", newNode.graphicID, RadixTree.BACKGROUND_COLOR);
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetBackgroundColor", newNode.graphicID, RadixTree.FALSE_COLOR);
|
|
index = s.charCodeAt(indexDifference) - "A".charCodeAt(0)
|
|
this.cmd("SetText", 1, s.substring(indexDifference));
|
|
|
|
newNode.children[index] = this.addR(s.substring(indexDifference), null, rt.x, rt.y, indexDifference+wordIndex);
|
|
newNode.children[index].parent = newNode;
|
|
this.cmd("Connect", newNode.graphicID, newNode.children[index].graphicID, RadixTree.FOREGROUND_COLOR, 0, false, s.charAt(indexDifference));
|
|
|
|
}
|
|
return newNode;
|
|
}
|
|
|
|
RadixTree.prototype.setNewPositions = function(tree, xPosition, yPosition)
|
|
{
|
|
if (tree != null)
|
|
{
|
|
tree.x = xPosition;
|
|
tree.y = yPosition;
|
|
var newX = xPosition - tree.width / 2;
|
|
var newY = yPosition + RadixTree.HEIGHT_DELTA;
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
if (tree.children[i] != null)
|
|
{
|
|
this.setNewPositions(tree.children[i], newX + tree.children[i].width / 2, newY);
|
|
newX = newX + tree.children[i].width;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
RadixTree.prototype.animateNewPositions = function(tree)
|
|
{
|
|
if (tree != null)
|
|
{
|
|
this.cmd("Move", tree.graphicID, tree.x, tree.y);
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
this.animateNewPositions(tree.children[i])
|
|
}
|
|
}
|
|
}
|
|
|
|
RadixTree.prototype.resizeWidths = function(tree)
|
|
{
|
|
if (tree == null)
|
|
{
|
|
return 0;
|
|
}
|
|
var size = 0;
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
tree.childWidths[i] = this.resizeWidths(tree.children[i]);
|
|
size += tree.childWidths[i]
|
|
}
|
|
tree.width = Math.max(size, RadixTree.NODE_WIDTH + 4)
|
|
return tree.width;
|
|
}
|
|
|
|
|
|
|
|
|
|
function RadixNode(val, id, initialX, initialY)
|
|
{
|
|
this.wordRemainder = val;
|
|
this.x = initialX;
|
|
this.y = initialY;
|
|
this.graphicID = id;
|
|
this.children = new Array(26);
|
|
this.childWidths = new Array(26);
|
|
for (var i = 0; i < 26; i++)
|
|
{
|
|
this.children[i] = null;
|
|
this.childWidths[i] =0;
|
|
}
|
|
this.width = 0;
|
|
this.parent = null;
|
|
this.isword = false;
|
|
}
|
|
|
|
RadixTree.prototype.disableUI = function(event)
|
|
{
|
|
this.insertField.disabled = true;
|
|
this.insertButton.disabled = true;
|
|
this.deleteField.disabled = true;
|
|
this.deleteButton.disabled = true;
|
|
this.findField.disabled = true;
|
|
this.findButton.disabled = true;
|
|
this.printButton.disabled = true;
|
|
}
|
|
|
|
RadixTree.prototype.enableUI = function(event)
|
|
{
|
|
this.insertField.disabled = false;
|
|
this.insertButton.disabled = false;
|
|
this.deleteField.disabled = false;
|
|
this.deleteButton.disabled = false;
|
|
this.findField.disabled = false;
|
|
this.findButton.disabled = false;
|
|
this.printButton.disabled = false;
|
|
}
|
|
|
|
|
|
var currentAlg;
|
|
|
|
function init()
|
|
{
|
|
var animManag = initCanvas();
|
|
currentAlg = new RadixTree(animManag, canvas.width, canvas.height);
|
|
|
|
}
|