public static DialogueOperatorEffect createAssertion(DialogueKBFormula left) throws Exception {
DialogueOperatorEffect f = new DialogueOperatorEffect();
left = left.normalize();
if (left.isConstant()) {
f.type = EffectType.ASSIGNMENT;
f.left = left;
f.right = DialogueKBFormula.trueFormula;
return f;
} else if (left.isNegatedFormula()) {
DialogueKBFormula child = (DialogueKBFormula) left.getFirstChild();
if (child.isConstant()) {
f.type = EffectType.ASSIGNMENT;
f.left = child;
f.right = DialogueKBFormula.falseFormula;
return f;
}
}
f.type = EffectType.ASSERTION;
if (left.isNegatedFormula()) {
left = (DialogueKBFormula) left.getFirstChild();
f.right = DialogueKBFormula.falseFormula;
} else {
f.right = DialogueKBFormula.trueFormula;
}
f.left = left;
return f;
}
public static DialogueOperatorEffect createGoal(String goal, DialogueKBFormula value) {
DialogueOperatorEffect f = new DialogueOperatorEffect();
f.type = EffectType.GOAL;
f.goalName = goal;
f.left = value;
return f;
}
public static DialogueOperatorEffect createImplication(
DialogueKBFormula ante, DialogueOperatorEffect then, DialogueOperatorEffect elsePart)
throws Exception {
if (then == null) throw new Exception("invalid implication: null effect");
else {
DialogueOperatorEffect f = new DialogueOperatorEffect();
f.type = EffectType.IMPLICATION;
f.left = ante;
f.value = then;
f.implyElse = elsePart;
return f;
}
}
public static DialogueOperatorEffect createAssignment(
DialogueKBFormula left, Object value, boolean parseValue) throws Exception {
if (!left.isConstant()) throw new Exception("Invalid left hand side of assignment: " + left);
if (value != null) {
if (value instanceof String) {
String rightString = ((String) value).toLowerCase();
if (rightString.equals("true")) return DialogueOperatorEffect.createAssertion(left);
else if (rightString.equals("false"))
return DialogueOperatorEffect.createAssertion(left.negate());
} else if (value instanceof DialogueKBFormula) {
if (((DialogueKBFormula) value).isConstant()) {
String rightString = ((DialogueKBFormula) value).getName();
if (rightString.equals("true")) return DialogueOperatorEffect.createAssertion(left);
else if (rightString.equals("false"))
return DialogueOperatorEffect.createAssertion(left.negate());
}
} else if (value instanceof Boolean) {
if ((Boolean) value) return DialogueOperatorEffect.createAssertion(left);
else return DialogueOperatorEffect.createAssertion(left.negate());
}
}
DialogueOperatorEffect f = new DialogueOperatorEffect();
f.type = EffectType.ASSIGNMENT;
f.left = left;
if (value instanceof DialogueKBFormula) {
DialogueKBFormula right = (DialogueKBFormula) value;
// if (!right.isNumericFormula() && !right.isConstant()) throw new Exception("Right hand side
// of assignment is not a numeric expression or constant: "+right);
f.right = right;
} else {
if (parseValue && ((value instanceof String) || (value instanceof Number))) {
try {
if (value != null) {
if (value instanceof String && !DialogueKBFormula.isStringConstant((String) value)) {
value = DialogueKBFormula.generateStringConstantFromContent((String) value);
}
DialogueKBFormula nv = DialogueKBFormula.parse(value.toString());
f.right = nv;
}
} catch (Exception e) {
f.value = value;
}
} else f.value = value;
}
return f;
}