module mod_vtm_aufbau
	{
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export class klasse_figur
			{
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				private band : Array<typ_symbol>;
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				private position : typ_position;
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public constructor(band : Array<typ_symbol> = [], position : typ_position = {"u": 0, "v": 0})
					{
						this.band = band;
						this.position = position;
					}
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public position_lesen() : typ_position
					{
						return this.position;
					}
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public bewegen(richtung : typ_richtung) : void
					{
						let summand : typ_position;
						switch (richtung)
							{
								case 0:
									{
										summand = {"u": +1, "v":  0};
										break;
									}
								case 1:
									{
										summand = {"u": +1, "v":  0};
										break;
									}
								case 2:
									{
										summand = {"u": +1, "v":  0};
										break;
									}
								case 3:
									{
										summand = {"u": +1, "v":  0};
										break;
									}
								case 4:
									{
										summand = {"u": +1, "v":  0};
										break;
									}
								case 5:
									{
										summand = {"u": +1, "v":  0};
										break;
									}
								default:
									{
										let meldung : string = ("ungültige Richtung '" + String(richtung) + "'");
										throw (new Error(meldung));
										break;
									}
							}
						this.position = {"u": (this.position.u + summand.u), "v": (this.position.v + summand.v)};
					}
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public band_schreiben(symbol : typ_symbol) : void
					{
						this.band.push(symbol);
					}
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public band_lesen() : schnittstelle_fehlermonade<typ_symbol>
					{
						if (this.band.length <= 0)
							{
								return (new klasse_nichts<typ_symbol>());
							}
						else
							{
								return (new klasse_schlicht<typ_symbol>(this.band[0]));
							}
					}
				
			}
		
	}