@Nullable
public static PsiExpression stripParentheses(@Nullable PsiExpression expression) {
while (expression instanceof PsiParenthesizedExpression) {
final PsiParenthesizedExpression parenthesizedExpression =
(PsiParenthesizedExpression) expression;
expression = parenthesizedExpression.getExpression();
}
return expression;
}
public static boolean areParenthesesNeeded(
PsiParenthesizedExpression expression, boolean ignoreClarifyingParentheses) {
final PsiElement parent = expression.getParent();
if (!(parent instanceof PsiExpression)) {
return false;
}
final PsiExpression child = expression.getExpression();
if (child == null) {
return true;
}
if (parent instanceof PsiArrayAccessExpression) {
final PsiArrayAccessExpression arrayAccessExpression = (PsiArrayAccessExpression) parent;
final PsiExpression indexExpression = arrayAccessExpression.getIndexExpression();
if (expression == indexExpression) {
return false;
}
}
return areParenthesesNeeded(child, (PsiExpression) parent, ignoreClarifyingParentheses);
}
@Nullable
private static PsiReferenceExpression getReferenceFromInstanceofExpression(
PsiExpression expression) {
if (expression instanceof PsiParenthesizedExpression) {
final PsiParenthesizedExpression parenthesizedExpression =
(PsiParenthesizedExpression) expression;
return getReferenceFromInstanceofExpression(parenthesizedExpression.getExpression());
} else if (expression instanceof PsiInstanceOfExpression) {
final PsiInstanceOfExpression instanceOfExpression = (PsiInstanceOfExpression) expression;
final PsiExpression operand =
ParenthesesUtils.stripParentheses(instanceOfExpression.getOperand());
if (!(operand instanceof PsiReferenceExpression)) {
return null;
}
return (PsiReferenceExpression) operand;
} else if (expression instanceof PsiPolyadicExpression) {
final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression) expression;
final IElementType tokenType = polyadicExpression.getOperationTokenType();
if (JavaTokenType.OROR != tokenType) {
return null;
}
final PsiExpression[] operands = polyadicExpression.getOperands();
final PsiReferenceExpression referenceExpression =
getReferenceFromInstanceofExpression(operands[0]);
if (referenceExpression == null) {
return null;
}
for (int i = 1, operandsLength = operands.length; i < operandsLength; i++) {
if (!referencesEqual(
referenceExpression, getReferenceFromInstanceofExpression(operands[i]))) {
return null;
}
}
return referenceExpression;
} else {
return null;
}
}
private static void removeParensFromParenthesizedExpression(
@NotNull PsiParenthesizedExpression parenthesizedExpression,
boolean ignoreClarifyingParentheses) {
final PsiExpression body = parenthesizedExpression.getExpression();
if (body == null) {
parenthesizedExpression.delete();
return;
}
final PsiElement parent = parenthesizedExpression.getParent();
if (!(parent instanceof PsiExpression)
|| parent instanceof PsiParenthesizedExpression
|| parent instanceof PsiArrayInitializerExpression) {
final PsiExpression newExpression = (PsiExpression) parenthesizedExpression.replace(body);
removeParentheses(newExpression, ignoreClarifyingParentheses);
return;
} else if (parent instanceof PsiArrayAccessExpression) {
final PsiArrayAccessExpression arrayAccessExpression = (PsiArrayAccessExpression) parent;
if (parenthesizedExpression == arrayAccessExpression.getIndexExpression()) {
// use addAfter() + delete() instead of replace() to
// workaround automatic insertion of parentheses by psi
final PsiExpression newExpression =
(PsiExpression) parent.addAfter(body, parenthesizedExpression);
parenthesizedExpression.delete();
removeParentheses(newExpression, ignoreClarifyingParentheses);
return;
}
}
final PsiExpression parentExpression = (PsiExpression) parent;
final int parentPrecedence = getPrecedence(parentExpression);
final int childPrecedence = getPrecedence(body);
if (parentPrecedence < childPrecedence) {
final PsiElement bodyParent = body.getParent();
final PsiParenthesizedExpression newParenthesizedExpression =
(PsiParenthesizedExpression) parenthesizedExpression.replace(bodyParent);
final PsiExpression expression = newParenthesizedExpression.getExpression();
if (expression != null) {
removeParentheses(expression, ignoreClarifyingParentheses);
}
} else if (parentPrecedence == childPrecedence) {
if (parentExpression instanceof PsiPolyadicExpression
&& body instanceof PsiPolyadicExpression) {
final PsiPolyadicExpression parentPolyadicExpression =
(PsiPolyadicExpression) parentExpression;
final IElementType parentOperator = parentPolyadicExpression.getOperationTokenType();
final PsiPolyadicExpression bodyPolyadicExpression = (PsiPolyadicExpression) body;
final IElementType bodyOperator = bodyPolyadicExpression.getOperationTokenType();
final PsiType parentType = parentPolyadicExpression.getType();
final PsiType bodyType = body.getType();
if (parentType != null
&& parentType.equals(bodyType)
&& parentOperator.equals(bodyOperator)) {
final PsiExpression[] parentOperands = parentPolyadicExpression.getOperands();
if (PsiTreeUtil.isAncestor(parentOperands[0], body, true)
|| isCommutativeOperator(bodyOperator)) {
// use addAfter() + delete() instead of replace() to
// workaround automatic insertion of parentheses by psi
final PsiExpression newExpression =
(PsiExpression) parent.addAfter(body, parenthesizedExpression);
parenthesizedExpression.delete();
removeParentheses(newExpression, ignoreClarifyingParentheses);
return;
}
}
if (ignoreClarifyingParentheses) {
if (parentOperator.equals(bodyOperator)) {
removeParentheses(body, ignoreClarifyingParentheses);
}
} else {
final PsiExpression newExpression = (PsiExpression) parenthesizedExpression.replace(body);
removeParentheses(newExpression, ignoreClarifyingParentheses);
}
} else {
final PsiExpression newExpression = (PsiExpression) parenthesizedExpression.replace(body);
removeParentheses(newExpression, ignoreClarifyingParentheses);
}
} else {
if (ignoreClarifyingParentheses
&& parent instanceof PsiPolyadicExpression
&& (body instanceof PsiPolyadicExpression || body instanceof PsiInstanceOfExpression)) {
removeParentheses(body, ignoreClarifyingParentheses);
} else {
final PsiExpression newExpression = (PsiExpression) parenthesizedExpression.replace(body);
removeParentheses(newExpression, ignoreClarifyingParentheses);
}
}
}