private static int calculateValue(UastAndroidContext context, UExpression expression) {
// This function assumes that the only inputs to the expression are static integer
// flags that combined via bitwise operands.
if (UastLiteralUtils.isIntegralLiteral(expression)) {
return (int) UastLiteralUtils.getLongValue((ULiteralExpression) expression);
}
if (expression instanceof UResolvable) {
UDeclaration resolvedNode = ((UResolvable) expression).resolve(context);
if (resolvedNode instanceof UVariable) {
UExpression initializer = ((UVariable) resolvedNode).getInitializer();
if (initializer != null) {
Object value = initializer.evaluate();
if (value instanceof Integer) {
return (Integer) value;
}
}
}
}
if (expression instanceof UBinaryExpression) {
UBinaryExpression binaryExpression = (UBinaryExpression) expression;
UastBinaryOperator operator = binaryExpression.getOperator();
int leftValue = calculateValue(context, binaryExpression.getLeftOperand());
int rightValue = calculateValue(context, binaryExpression.getRightOperand());
if (operator == UastBinaryOperator.BITWISE_OR) {
return leftValue | rightValue;
}
if (operator == UastBinaryOperator.BITWISE_AND) {
return leftValue & rightValue;
}
if (operator == UastBinaryOperator.BITWISE_XOR) {
return leftValue ^ rightValue;
}
}
return 0;
}
@Nullable
private static String getLhs(@NonNull UCallExpression call) {
UElement parent = call.getParent();
if (UastBinaryExpressionWithTypeUtils.isTypeCast(parent)) {
assert parent != null;
parent = parent.getParent();
}
if (parent instanceof UVariable) {
UVariable vde = (UVariable) parent;
return vde.getName();
} else if (parent instanceof UBinaryExpression) {
UBinaryExpression be = (UBinaryExpression) parent;
UExpression left = be.getLeftOperand();
if (left instanceof USimpleReferenceExpression || left instanceof UQualifiedExpression) {
return be.getLeftOperand().toString();
} else if (left instanceof UArrayAccessExpression) {
UArrayAccessExpression aa = (UArrayAccessExpression) left;
return aa.getReceiver().toString();
}
}
return null;
}
