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sc-resources/数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/Visualization/AlgorithmLibrary/Trie.js

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JavaScript
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// 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.
Trie.NODE_WIDTH = 30;
Trie.LINK_COLOR = "#007700";
Trie.HIGHLIGHT_CIRCLE_COLOR = "#007700";
Trie.FOREGROUND_COLOR = "#007700";
Trie.BACKGROUND_COLOR = "#CCFFCC";
Trie.TRUE_COLOR = "#CCFFCC";
Trie.PRINT_COLOR = Trie.FOREGROUND_COLOR;
Trie.FALSE_COLOR = "#FFFFFF"
Trie.WIDTH_DELTA = 50;
Trie.HEIGHT_DELTA = 50;
Trie.STARTING_Y = 80;
Trie.LeftMargin = 300;
Trie.NEW_NODE_Y = 100
Trie.NEW_NODE_X = 50;
Trie.FIRST_PRINT_POS_X = 50;
Trie.PRINT_VERTICAL_GAP = 20;
Trie.PRINT_HORIZONTAL_GAP = 50;
function Trie(am, w, h)
{
this.init(am, w, h);
}
Trie.prototype = new Algorithm();
Trie.prototype.constructor = Trie;
Trie.superclass = Algorithm.prototype;
Trie.prototype.init = function(am, w, h)
{
var sc = Trie.superclass;
this.startingX = w / 2;
this.first_print_pos_y = h - 2 * Trie.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();
}
Trie.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);
}
Trie.prototype.reset = function()
{
this.nextIndex = 3;
this.root = null;
}
Trie.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);
}
}
Trie.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);
}
}
Trie.prototype.printCallback = function(event)
{
this.implementAction(this.printTree.bind(this),"");
}
Trie.prototype.findCallback = function(event)
{
var findValue = this.findField.value.toUpperCase()
finndValue = findValue.replace(/[^a-z]/gi,'');
this.findField.value = "";
this.implementAction(this.findElement.bind(this),findValue);
}
Trie.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: ", Trie.FIRST_PRINT_POS_X, this.first_print_pos_y);
this.cmd("CreateHighlightCircle", this.highlightID, Trie.HIGHLIGHT_CIRCLE_COLOR, this.root.x, this.root.y);
this.cmd("SetWidth", this.highlightID, Trie.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 = Trie.FIRST_PRINT_POS_X;
this.yPosOfNextLabel = this.first_print_pos_y;
this.printTreeRec(this.root, "");
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;
}
Trie.prototype.printTreeRec = function(tree, stringSoFar)
{
if (tree.wordRemainder != "")
{
}
if (tree.isword)
{
var nextLabelID = this.nextIndex++;
this.cmd("CreateLabel", nextLabelID, stringSoFar + " ", 20, 10, 0);
this.cmd("SetForegroundColor", nextLabelID, Trie.PRINT_COLOR);
this.cmd("AlignRight", nextLabelID, this.printLabel1, Trie.PRINT_COLOR);
this.cmd("MoveToAlignRight", nextLabelID, nextLabelID - 1);
this.cmd("Step");
this.xPosOfNextLabel += Trie.PRINT_HORIZONTAL_GAP;
if (this.xPosOfNextLabel > this.print_max)
{
this.xPosOfNextLabel = Trie.FIRST_PRINT_POS_X;
this.yPosOfNextLabel += Trie.PRINT_VERTICAL_GAP;
}
}
for (var i = 0; i < 26; i++)
{
if (tree.children[i] != null)
{
var stringSoFar2 = stringSoFar + tree.children[i].wordRemainder;
var nextLabelID = this.nextIndex++;
var fromx = (tree.children[i].x + tree.x) / 2 + Trie.NODE_WIDTH / 2;
var fromy = (tree.children[i].y + tree.y) / 2;
this.cmd("CreateLabel", nextLabelID, tree.children[i].wordRemainder,fromx, fromy, 0);
this.cmd("MoveToAlignRight", nextLabelID, this.printLabel2);
this.cmd("Move", this.highlightID, tree.children[i].x, tree.children[i].y);
this.cmd("Step");
this.cmd("Delete", nextLabelID);
this.nextIndex--;
this.cmd("SetText", this.printLabel2, stringSoFar2);
this.printTreeRec(tree.children[i], stringSoFar2);
this.cmd("Move", this.highlightID, tree.x, tree.y);
this.cmd("SetText", this.printLabel2, stringSoFar);
this.cmd("Step");
}
}
}
Trie.prototype.findElement = function(word)
{
this.commands = [];
this.commands = new Array();
this.cmd("SetText", 0, "正在搜索： ");
this.cmd("SetText", 1, "\"" + word + "\"");
this.cmd("AlignRight", 1, 0);
this.cmd("Step");
var node = this.doFind(this.root, word);
if (node != null)
{
this.cmd("SetText", 0, "Found \""+word+"\"");
}
else
{
this.cmd("SetText", 0, "\""+word+"\" not Found");
}
this.cmd("SetText", 1, "");
this.cmd("SetText", 2, "");
return this.commands;
}
Trie.prototype.doFind = function(tree, s)
{
if (tree == null)
{
return null;
}
this.cmd("SetHighlight", tree.graphicID , 1);
if (s.length == 0)
{
if (tree.isword == true)
{
this.cmd("SetText", 2, "Reached the end of the string \nCurrent node is True\nWord is in the tree");
this.cmd("Step");
this.cmd("SetHighlight", tree.graphicID , 0);
return tree
}
else
{
this.cmd("SetText", 2, "Reached the end of the string \nCurrent node is False\nWord is Not the tree");
this.cmd("Step");
this.cmd("SetHighlight", tree.graphicID , 0);
return null
}
}
else
{
this.cmd("SetHighlightIndex", 1, 1);
var index = s.charCodeAt(0) - "A".charCodeAt(0);
if (tree.children[index] == null)
{
this.cmd("SetText", 2, "Child " + s.charAt(0) + " does not exist\nWord is Not the tree");
this.cmd("Step");
this.cmd("SetHighlight", tree.graphicID , 0);
return null
}
this.cmd("CreateHighlightCircle", this.highlightID, Trie.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
this.cmd("SetWidth", this.highlightID, Trie.NODE_WIDTH);
this.cmd("SetText", 2, "Making recursive call to " + s.charAt(0) + " child, passing in " + s.substring(1));
this.cmd("Step")
this.cmd("SetHighlight", tree.graphicID , 0);
this.cmd("SetHighlightIndex", 1, -1);
this.cmd("SetText", 1, "\"" + s.substring(1) + "\"");
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], s.substring(1))
}
}
Trie.prototype.insertElement = function(insertedValue)
{
this.cmd("SetText", 0, "");
return this.commands;
}
Trie.prototype.insert = function(elem, tree)
{
}
Trie.prototype.deleteElement = function(word)
{
this.commands = [];
this.cmd("SetText", 0, "正在刪除： ");
this.cmd("SetText", 1, "\"" + word + "\"");
this.cmd("AlignRight", 1, 0);
this.cmd("Step");
var node = this.doFind(this.root, word);
if (node != null)
{
this.cmd("SetHighlight", node.graphicID , 1);
this.cmd("SetText", 2, "Found \""+word+"\", setting value in tree to False");
this.cmd("step")
this.cmd("SetBackgroundColor", node.graphicID, Trie.FALSE_COLOR);
node.isword = false
this.cmd("SetHighlight", node.graphicID , 0);
this.cleanupAfterDelete(node)
this.resizeTree()
}
else
{
this.cmd("SetText", 2, "\""+word+"\" not in tree, nothing to delete");
this.cmd("step")
this.cmd("SetHighlightIndex", 1, -1)
}
this.cmd("SetText", 0, "");
this.cmd("SetText", 1, "");
this.cmd("SetText", 2, "");
return this.commands;
}
Trie.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;
}
Trie.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;
}
}
}
Trie.prototype.resizeTree = function()
{
this.resizeWidths(this.root);
if (this.root != null)
{
var startingPoint = this.root.width / 2 + 1 + Trie.LeftMargin;
this.setNewPositions(this.root, startingPoint, Trie.STARTING_Y);
this.animateNewPositions(this.root);
this.cmd("Step");
}
}
Trie.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");
if (this.root == null)
{
this.cmd("CreateCircle", this.nextIndex, "", Trie.NEW_NODE_X, Trie.NEW_NODE_Y);
this.cmd("SetForegroundColor", this.nextIndex, Trie.FOREGROUND_COLOR);
this.cmd("SetBackgroundColor", this.nextIndex, Trie.FALSE_COLOR);
this.cmd("SetWidth", this.nextIndex, Trie.NODE_WIDTH);
this.cmd("SetText", 2, "Creating a new root");
this.root = new TrieNode("", this.nextIndex, Trie.NEW_NODE_X, Trie.NEW_NODE_Y)
this.cmd("Step");
this.resizeTree();
this.cmd("SetText", 2, "" );
this.highlightID = this.nextIndex++;
this.nextIndex += 1;
}
this.addR(word.toUpperCase(), this.root);
this.cmd("SetText", 0, "");
this.cmd("SetText", 1, "");
this.cmd("SetText", 2, "");
return this.commands;
}
Trie.prototype.addR = function(s, tree)
{
this.cmd("SetHighlight", tree.graphicID , 1);
if (s.length == 0)
{
this.cmd("SetText", 2, "Reached the end of the string \nSet current node to true");
this.cmd("Step");
// this.cmd("SetText", tree.graphicID, "T");
this.cmd("SetBackgroundColor", tree.graphicID, Trie.TRUE_COLOR);
this.cmd("SetHighlight", tree.graphicID , 0);
tree.isword = true;
return;
}
else
{
this.cmd("SetHighlightIndex", 1, 1);
var index = s.charCodeAt(0) - "A".charCodeAt(0);
if (tree.children[index] == null)
{
this.cmd("CreateCircle", this.nextIndex, s.charAt(0), Trie.NEW_NODE_X, Trie.NEW_NODE_Y);
this.cmd("SetForegroundColor", this.nextIndex, Trie.FOREGROUND_COLOR);
this.cmd("SetBackgroundColor", this.nextIndex, Trie.FALSE_COLOR);
this.cmd("SetWidth", this.nextIndex, Trie.NODE_WIDTH);
this.cmd("SetText", 2, "Child " + s.charAt(0) + " does not exist. Creating ... ");
tree.children[index] = new TrieNode(s.charAt(0), this.nextIndex, Trie.NEW_NODE_X, Trie.NEW_NODE_Y)
tree.children[index].parent = tree;
this.cmd("Connect", tree.graphicID, tree.children[index].graphicID, Trie.FOREGROUND_COLOR, 0, false, s.charAt(0));
this.cmd("Step");
this.resizeTree();
this.cmd("SetText", 2, "" );
this.nextIndex += 1;
this.highlightID = this.nextIndex++;
}
this.cmd("CreateHighlightCircle", this.highlightID, Trie.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
this.cmd("SetWidth", this.highlightID, Trie.NODE_WIDTH);
this.cmd("SetText", 2, "Making recursive call to " + s.charAt(0) + " child, passing in \"" + s.substring(1) + "\"");
this.cmd("Step")
this.cmd("SetHighlight", tree.graphicID , 0);
this.cmd("SetHighlightIndex", 1, -1);
this.cmd("SetText", 1, "\"" + s.substring(1) + "\"");
this.cmd("Move", this.highlightID, tree.children[index].x, tree.children[index].y);
this.cmd("Step")
this.cmd("Delete", this.highlightID);
this.addR(s.substring(1), tree.children[index])
}
}
Trie.prototype.setNewPositions = function(tree, xPosition, yPosition)
{
if (tree != null)
{
tree.x = xPosition;
tree.y = yPosition;
var newX = xPosition - tree.width / 2;
var newY = yPosition + Trie.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;
}
}
}
}
Trie.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])
}
}
}
Trie.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, Trie.NODE_WIDTH + 4)
return tree.width;
}
function TrieNode(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;
}
Trie.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;
}
Trie.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 Trie(animManag, canvas.width, canvas.height);
}
新增問題並參考 檢視 Git Blame 複製固定連結