@Override
public SemanticContext evalPrecedence(Recognizer<?, ?> parser, RuleContext parserCallStack) {
boolean differs = false;
List<SemanticContext> operands = new ArrayList<SemanticContext>();
for (SemanticContext context : opnds) {
SemanticContext evaluated = context.evalPrecedence(parser, parserCallStack);
differs |= (evaluated != context);
if (evaluated == null) {
// The AND context is false if any element is false
return null;
} else if (evaluated != NONE) {
// Reduce the result by skipping true elements
operands.add(evaluated);
}
}
if (!differs) {
return this;
}
if (operands.isEmpty()) {
// all elements were true, so the AND context is true
return NONE;
}
SemanticContext result = operands.get(0);
for (int i = 1; i < operands.size(); i++) {
result = SemanticContext.and(result, operands.get(i));
}
return result;
}
