// Copyright 2011 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 ``AS IS'' AND ANY EXPRESS OR IMPLIED // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND // FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 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 function Reverse(am, w, h) { this.init(am, w, h); } Reverse.prototype = new Recursive(); Reverse.prototype.constructor = Reverse; Reverse.superclass = Recursive.prototype; Reverse.ACTIVATION_FIELDS = ["word ", "subProblem ", "subSolution ", "solution "]; Reverse.CODE = [["def ","reverse(word)",":"], [" if ","(word == \"\"): "], [" return word"], [" else:"], [" subProblem = ", "word[1:]"], [" subSolution = ", "reverse(subProblem)"], [" solution = ", "subSolution + word[0]"], [" return = ", "solution"]]; Reverse.RECURSIVE_DELTA_Y = Reverse.ACTIVATION_FIELDS.length * Recursive.ACTIVATION_RECORD_HEIGHT; Reverse.ACTIVATION_RECORT_START_X = 375; Reverse.ACTIVATION_RECORT_START_Y = 20; Reverse.prototype.init = function(am, w, h) { Reverse.superclass.init.call(this, am, w, h); this.nextIndex = 0; this.addControls(); this.code = Reverse.CODE; this.addCodeToCanvas(this.code); this.animationManager.StartNewAnimation(this.commands); this.animationManager.skipForward(); this.animationManager.clearHistory(); this.initialIndex = this.nextIndex; this.oldIDs = []; this.commands = []; } Reverse.prototype.addControls = function() { this.controls = []; this.reverseField = addControlToAlgorithmBar("Text", ""); this.reverseField.onkeydown = this.returnSubmit(this.reverseField, this.reverseCallback.bind(this), 10, false); this.controls.push(this.reverseField); this.reverseButton = addControlToAlgorithmBar("Button", "Reverse"); this.reverseButton.onclick = this.reverseCallback.bind(this); this.controls.push(this.reverseButton); } Reverse.prototype.reverseCallback = function(event) { var factValue; if (this.reverseField.value != "") { var revValue =this.reverseField.value; this.implementAction(this.doReverse.bind(this),revValue); } } Reverse.prototype.doReverse = function(value) { this.commands = []; this.clearOldIDs(); this.currentY = Reverse.ACTIVATION_RECORT_START_Y; this.currentX = Reverse.ACTIVATION_RECORT_START_X; var final = this.reverse(value); var resultID = this.nextIndex++; this.oldIDs.push(resultID); this.cmd("CreateLabel", resultID, "reverse(" + String(value) + ") = " + String(final), Recursive.CODE_START_X, Recursive.CODE_START_Y + (this.code.length + 1) * Recursive.CODE_LINE_HEIGHT, 0); return this.commands; } Reverse.prototype.reverse = function(value) { var activationRec = this.createActivation("reverse ", Reverse.ACTIVATION_FIELDS, this.currentX, this.currentY); this.cmd("SetText", activationRec.fieldIDs[0], value); // this.cmd("CreateLabel", ID, "", 10, this.currentY, 0); var oldX = this.currentX; var oldY = this.currentY; this.currentY += Reverse.RECURSIVE_DELTA_Y; if (this.currentY + Recursive.RECURSIVE_DELTA_Y > this.canvasHeight) { this.currentY = Reverse.ACTIVATION_RECORT_START_Y; this.currentX += Recursive.ACTIVATION_RECORD_SPACING; } this.cmd("SetForegroundColor", this.codeID[0][1], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("Step"); this.cmd("SetForegroundColor", this.codeID[0][1], Recursive.CODE_STANDARD_COLOR); this.cmd("SetForegroundColor", this.codeID[1][1], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("Step"); this.cmd("SetForegroundColor", this.codeID[1][1], Recursive.CODE_STANDARD_COLOR); if (value != "") { this.cmd("SetForegroundColor", this.codeID[4][0], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("SetForegroundColor", this.codeID[4][1], Recursive.CODE_HIGHLIGHT_COLOR); var subProblem = value.substr(1); this.cmd("SetText", activationRec.fieldIDs[1], subProblem); this.cmd("Step"); this.cmd("SetForegroundColor", this.codeID[4][0], Recursive.CODE_STANDARD_COLOR); this.cmd("SetForegroundColor", this.codeID[4][1], Recursive.CODE_STANDARD_COLOR); this.cmd("SetForegroundColor", this.codeID[5][1], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("Step"); this.cmd("SetForegroundColor", this.codeID[5][1], Recursive.CODE_STANDARD_COLOR); var subSolution = this.reverse(subProblem); this.cmd("SetForegroundColor", this.codeID[5][0], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("SetForegroundColor", this.codeID[5][1], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("SetText", activationRec.fieldIDs[2], subSolution); this.cmd("Step"); this.cmd("SetForegroundColor", this.codeID[5][0], Recursive.CODE_STANDARD_COLOR); this.cmd("SetForegroundColor", this.codeID[5][1], Recursive.CODE_STANDARD_COLOR); this.cmd("SetForegroundColor", this.codeID[6][0], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("SetForegroundColor", this.codeID[6][1], Recursive.CODE_HIGHLIGHT_COLOR); var solution = subSolution + value[0]; this.cmd("SetText", activationRec.fieldIDs[3], solution); this.cmd("Step"); this.cmd("SetForegroundColor", this.codeID[6][0], Recursive.CODE_STANDARD_COLOR); this.cmd("SetForegroundColor", this.codeID[6][1], Recursive.CODE_STANDARD_COLOR); this.cmd("SetForegroundColor", this.codeID[7][0], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("SetForegroundColor", this.codeID[7][1], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("Step"); this.deleteActivation(activationRec); this.currentY = oldY; this.currentX = oldX; this.cmd("CreateLabel", this.nextIndex, "Return Value = \"" + solution + "\"", oldX, oldY); this.cmd("SetForegroundColor", this.nextIndex, Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("Step"); this.cmd("SetForegroundColor", this.codeID[7][0], Recursive.CODE_STANDARD_COLOR); this.cmd("SetForegroundColor", this.codeID[7][1], Recursive.CODE_STANDARD_COLOR); this.cmd("Delete",this.nextIndex); // this.cmd("SetForegroundColor", this.codeID[4][3], Recursive.CODE_HIGHLIGHT_COLOR); // this.cmd("Step"); return solution; } else { this.cmd("SetForegroundColor", this.codeID[2][0], Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("Step"); this.cmd("SetForegroundColor", this.codeID[2][0], Recursive.CODE_STANDARD_COLOR); this.currentY = oldY; this.currentX = oldX; this.deleteActivation(activationRec); this.cmd("CreateLabel", this.nextIndex, "Return Value = \"\"", oldX, oldY); this.cmd("SetForegroundColor", this.nextIndex, Recursive.CODE_HIGHLIGHT_COLOR); this.cmd("Step"); this.cmd("Delete",this.nextIndex); return ""; } } var currentAlg; function init() { var animManag = initCanvas(); currentAlg = new Reverse(animManag, canvas.width, canvas.height); }