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package
{
import flash.display.Sprite;
import flash.events.Event;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFieldType;
import flash.text.TextFormat;
import flash.utils.Dictionary;
public class Morse extends Sprite
{
// general mapping of chars to morse code
private var baseMap:Object;
// map of letters and integers regualr expressions to Morse code conventions
private var charMap:Dictionary;
// map of morse to characters
private var morseMap:Dictionary;
// five spaces per convention
private var wordSeparator:String = " ";
// three spaces per convention
private var letterSeparator:String = " ";
private var alphaInput:TextField;
private var morseOutput:TextField;
private var morseInput:TextField;
private var alphaOutput:TextField;
private var alphaPrompt:TextField;
private var morsePrompt:TextField;
public function Morse()
{
init();
}
private function init():void
{
createMaps();
drawUI();
}
private function drawUI():void
{
drawInputs();
drawOutputs();
drawPrompts();
placeUI();
}
private function drawPrompts():void
{
alphaPrompt = drawPrompt("enter alphanumerical text:");
morsePrompt = drawPrompt("enter morse sequences (letters must be separated by 3 spaces; words - by 5 spaces):");
}
/**
* Creates alphaPrompt test field
*/
private function drawPrompt(text:String):TextField
{
var textField:TextField = new TextField();
textField.defaultTextFormat = new TextFormat("Arial", 11, 0x004040);
textField.multiline = morseOutput.wordWrap = false;
textField.autoSize = TextFieldAutoSize.LEFT;
textField.text = text;
return textField;
}
private function drawOutputs():void
{
alphaOutput = drawOutput();
morseOutput = drawOutput();
}
/**
* Creates output text field
*/
private function drawOutput():TextField
{
var textField:TextField = new TextField();
textField.defaultTextFormat = new TextFormat("Arial", 12, 0x000000, "bold");
textField.multiline = textField.wordWrap = false;
textField.border = true;
textField.borderColor = 0x005329;
textField.background = true;
textField.backgroundColor = 0xF4FFFA;
textField.width = 500;
textField.height = 22;
return textField;
}
private function drawInputs():void
{
alphaInput = drawInput("A-Z 0-9", onAlphaInput);
morseInput = drawInput("-. ", onMorseInput);
}
/**
* Creates input text field
* @param restrict - charachters allowed for intput
* @param handler - function that hsndles Event.CHANGE
* @return
*/
private function drawInput(restrict:String, handler:Function):TextField
{
var textField:TextField = new TextField();
textField.defaultTextFormat = new TextFormat("Arial", 12);
textField.type = TextFieldType.INPUT;
textField.restrict = restrict;
textField.multiline = textField.wordWrap = false;
textField.border = true;
textField.borderColor = 0x808080;
textField.background = true;
textField.backgroundColor = 0xF0F0F0;
textField.width = 500;
textField.height = 22;
textField.addEventListener(Event.CHANGE, handler);
return textField;
}
/**
* Places UI elements and positions them relative to each other
*/
private function placeUI():void
{
var children:Array = [alphaPrompt, alphaInput, morseOutput, morsePrompt, morseInput, alphaOutput];
var nextY:Number = 20;
for each (var textField:TextField in children)
{
addChild(textField);
textField.x = 20;
textField.y = nextY;
nextY += textField.height + 10 * int(textField != alphaPrompt && textField != morsePrompt);
}
}
/**
* Handles alphaInput text field change event
* @param e
*/
private function onAlphaInput(e:Event):void
{
var outString:String = alphaInput.text;
// append word separator to words
outString = outString.replace(/\b\w+\b/g, addWordSeparator);
// append letter separator to letters
outString = outString.replace(/\w/g, addLetterSeparator);
// loop through the map and replace characers with corresponding Morse codes
for (var prop:Object in charMap)
outString = outString.replace(RegExp(prop), charMap[prop]);
morseOutput.text = outString;
}
/**
* Handles morseInput text field change event.
* @param e
*/
private function onMorseInput(e:Event):void
{
var outputString:String = morseInput.text;
for each (var result:String in morseInput.text.match(/[\.\-]+\s\s\s/g))
{
if (morseMap[result])
{
outputString = outputString.replace(result, morseMap[result]);
}
else
{
// if this is not a valid code - remove it from the text input
morseInput.text = morseInput.text.replace(result, "");
outputString = outputString.replace(result, "");
}
}
alphaOutput.text = outputString.replace(/[\.\-]/g, "").replace(/\s+/g, " ");
}
/**
* Used in String.replace() to inject word separator
* @return
*/
private function addWordSeparator():String
{
return [arguments[0], wordSeparator].join("");
}
/**
* Used in String.replace() to inject letter separator
* @return
*/
private function addLetterSeparator():String
{
return [arguments[0], letterSeparator].join("");
}
private function createMaps():void
{
createBaseMap();
createCharMap();
}
/**
* Creates chars to morse code relations
*/
private function createBaseMap():void
{
// international convention
baseMap = {};
baseMap["A"] = ".-";
baseMap["B"] = "-...";
baseMap["C"] = "-.-.";
baseMap["D"] = "-..";
baseMap["E"] = ".";
baseMap["F"] = "..-.";
baseMap["G"] = "--.";
baseMap["H"] = "....";
baseMap["I"] = "..";
baseMap["J"] = ".---";
baseMap["K"] = "-.-";
baseMap["L"] = ".-..";
baseMap["M"] = "--";
baseMap["N"] = "-.";
baseMap["O"] = "---";
baseMap["P"] = ".--.";
baseMap["Q"] = "--.-";
baseMap["R"] = ".-.";
baseMap["S"] = "...";
baseMap["T"] = "-";
baseMap["U"] = "..-";
baseMap["V"] = "...-";
baseMap["W"] = ".--";
baseMap["X"] = "-..-";
baseMap["Y"] = "-.--";
baseMap["Z"] = "--..";
baseMap["0"] = "-----";
baseMap["1"] = ".----";
baseMap["2"] = "..---";
baseMap["3"] = "...--";
baseMap["4"] = "....-";
baseMap["5"] = ".....";
baseMap["6"] = "-....";
baseMap["7"] = "--...";
baseMap["8"] = "---..";
baseMap["9"] = "----.";
}
/**
* Creates mapping of alphanumerical characters to Morse code conventions
*/
private function createCharMap():void
{
charMap = new Dictionary();
morseMap = new Dictionary();
for (var prop:String in baseMap)
{
// create chars to morse map
charMap[new RegExp(prop, "g")] = baseMap[prop];
// create morse to chars map
morseMap[baseMap[prop] + letterSeparator] = prop;
}
}
}
}
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