[operators][2/2]feat: Add Assignment operation expr with xor assignemnt

src/main/java/com/google/api/generator/engine/ast/AssignmentOperationExpr.java

@@ -95,9 +95,8 @@ private AssignmentOperationExpr build() {
  }
 
  // Check type for XOR and assignment operator (^=).
- // TODO(summerji): Complete the type-checking for ^= and unit test.
  if (operator.equals(OperatorKind.ASSIGNMENT_XOR)) {
- Preconditions.checkState(isValidXORAssignmentType(lhsType, rhsType), errorMsg);
+ Preconditions.checkState(isValidXorAssignmentType(lhsType, rhsType), errorMsg);
  }
  return assignmentOperationExpr;
  }
@@ -130,9 +129,25 @@ private boolean isValidMultiplyAssignmentType(TypeNode variableType, TypeNode va
  return false;
  }
 
- // TODO(summerji): Complete the type-checking for ^= and unit test.
- private boolean isValidXORAssignmentType(TypeNode variableType, TypeNode valueType) {
- return true;
+ // isValidXorAssignmentType validates the types for LHS variable expr and RHS expr.
+ // ^= can be applied on boolean and non-floating-point numeric type.
+ private boolean isValidXorAssignmentType(TypeNode variableType, TypeNode valueType) {
+ // LHS is boolean or its boxed type, RHS should be boolean or its boxed type.
+ if (variableType.equals(TypeNode.BOOLEAN)) {
+ return valueType.equals(variableType);
+ }
+ // LHS is integer boxed type, RHS should be non-floating-point numeric types or their boxed
+ // types.
+ if (variableType.equals(TypeNode.INT)) {
+ return TypeNode.isNumericType(valueType) && !TypeNode.isFloatingPointType(valueType);
+ }
+ // LHS is non-floating-point numeric types, RHS should be non-float-point numeric types or
+ // their boxed types.
+ return TypeNode.isNumericType(variableType)
+ && TypeNode.isNumericType(valueType)
+ && !TypeNode.isFloatingPointType(variableType)
+ && !TypeNode.isFloatingPointType(valueType)
+ && !TypeNode.isBoxedType(variableType);
  }
  }
 }