CountNodes

Beschreibung

Die Funktion countNodes ruft die Methode getNumberOfNodes des entsprechenden OpenMathObjektes auf und zählt die Knoten des OpenMathObjektes. (In den implementierten OpenMathObjekten ist jedoch diese Funktion nicht implementiert)

Syntax

countNodes(Expression argument)

Parameter

• argument - die Expression, dessen Knoten gezählt werden sollen

Return Value

• Gibt die Anzahl der Knoten zurück

Beispiele

Benutzung mit Variablen

countNodes([pos=1])
countNodes([var=a])

JUnit Tests

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@Before 
public void beforeTest() {
  placeFillInVariable(1, OMParser.parse("0"));
  placeFillInVariable(2, OMParser.parse("1"));
		
  placeExerciseVariable("a", OMParser.parse("0"));
  placeExerciseVariable("b", OMParser.parse("1"));
}
	
@Test 
public void testCountNodes() {
  assertTrue(3 == getEvaluator().getNumberResult("countNodes(2+2)"));
  assertTrue(5 == getEvaluator().getNumberResult("countNodes(3*(2+2))"));
  assertTrue(5 == getEvaluator().getNumberResult("countNodes(3*(a+2))"));
  assertFalse(1 ==getEvaluator().getNumberResult("countNodes(2+2)"));
}
	
@Test 
public void testCountNodesWithInput() {
  assertTrue(1 == getEvaluator().getNumberResult("countNodes([pos=2])"));
  assertTrue(5 == getEvaluator().getNumberResult("countNodes(3*([pos=1]+2))"));
}
	
@Test 
public void testCountNodesWithVariables() {
  assertTrue(1 == getEvaluator().getNumberResult("countNodes([var=a])"));
  assertTrue(5 == getEvaluator().getNumberResult("countNodes(3*([var=a]+2))"));
}
	
@Test 
public void testCountNodesWithExpressions() {
  assertTrue(1 == getEvaluator().getNumberResult("countNodes('countNodes(2+2)')"));
}
	
@Test (expected=InvalidEvaluatorFunctionArgumentException.class)
public void testCountNodesWithWrongInputCharacter() {
  getEvaluator().getNumberResult("countNodes(a)");
}
	
@Test (expected=UnsupportedEvaluatorFunctionException.class)
public void testCountNodesWithTwoArguments() {
  getEvaluator().getNumberResult("countNodes(3, 2)");
}
	
@Test (expected=UnsupportedEvaluatorFunctionException.class)
public void testCountNodesWithThreeArguments() {
  getEvaluator().getNumberResult("countNodes(1, 2, 3)");
}
	
@Test (expected=UndefinedExerciseVariableException.class)
public void testCountNodesWithMissingExcerciseVariable() {
  getEvaluator().getNumberResult("countNodes('[var=j]')");
}
	
@Test (expected=UndefinedFillInVariableException.class)
public void testCountNodesWithMissingInput() {
  getEvaluator().getNumberResult("countNodes('[pos=42]')");
}