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@ -1,4 +1,7 @@
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<?php
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class InvalidDirectionException extends UnexpectedValueException{
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}
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class Direction
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{
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private static $top = 0;
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@ -27,6 +30,28 @@ class Direction
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break;
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}
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}
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public static function make($str){
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$dir = new Direction();
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switch((string)$str){
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case "x+":
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$dir->value = Direction::$right;
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break;
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case "x-":
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$dir->value = Direction::$left;
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break;
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case "y+":
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$dir->value = Direction::$top;
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break;
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case "y-":
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$dir->value = Direction::$bottom;
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break;
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default:
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throw new InvalidDirectionException("expected 'x+', 'x-', 'y+' or 'y-'". (string)$str."received.");
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break;
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}
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return $dir;
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}
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public function opposite(){
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$opposites = array(
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Direction::$top => Direction::$bottom,
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