public static boolean isAssociativeOperation(PsiPolyadicExpression expression) {
final IElementType tokenType = expression.getOperationTokenType();
final PsiType type = expression.getType();
final PsiPrimitiveType primitiveType;
if (type instanceof PsiClassType) {
primitiveType = PsiPrimitiveType.getUnboxedType(type);
if (primitiveType == null) {
return false;
}
} else if (type instanceof PsiPrimitiveType) {
primitiveType = (PsiPrimitiveType) type;
} else {
return false;
}
if (JavaTokenType.PLUS == tokenType || JavaTokenType.ASTERISK == tokenType) {
return !PsiType.FLOAT.equals(primitiveType) && !PsiType.DOUBLE.equals(primitiveType);
} else if (JavaTokenType.EQEQ == tokenType || JavaTokenType.NE == tokenType) {
return PsiType.BOOLEAN.equals(primitiveType);
} else if (JavaTokenType.AND == tokenType
|| JavaTokenType.OR == tokenType
|| JavaTokenType.XOR == tokenType) {
return true;
} else if (JavaTokenType.OROR == tokenType || JavaTokenType.ANDAND == tokenType) {
return true;
}
return false;
}
@Override
public boolean satisfiedBy(PsiElement element) {
final PsiJavaToken token;
if (element instanceof PsiJavaToken) {
token = (PsiJavaToken) element;
} else {
final PsiElement prevSibling = element.getPrevSibling();
if (prevSibling instanceof PsiJavaToken) {
token = (PsiJavaToken) prevSibling;
} else {
return false;
}
}
final PsiElement parent = element.getParent();
if (!(parent instanceof PsiPolyadicExpression)) {
return false;
}
final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression) parent;
final PsiType type = polyadicExpression.getType();
if (type == null || type.equalsToText("java.lang.String")) {
// handled by JoinConcatenatedStringLiteralsIntention
return false;
}
final PsiPolyadicExpression subexpression = getSubexpression(polyadicExpression, token);
if (subexpression == null) {
return false;
}
if (!isPartOfLargerExpression(polyadicExpression)) {
// handled by ConstantExpressionIntention
return false;
}
if (!PsiUtil.isConstantExpression(subexpression)) {
return false;
}
final Object value = ExpressionUtils.computeConstantExpression(subexpression);
return value != null;
}
private static boolean isInConcatenationContext(PsiElement element) {
final PsiElement parent = element.getParent();
if (parent instanceof PsiPolyadicExpression) {
final PsiPolyadicExpression parentExpression = (PsiPolyadicExpression) parent;
final PsiType parentType = parentExpression.getType();
if (parentType == null) {
return false;
}
final String parentTypeText = parentType.getCanonicalText();
return JAVA_LANG_STRING.equals(parentTypeText);
} else if (parent instanceof PsiAssignmentExpression) {
final PsiAssignmentExpression parentExpression = (PsiAssignmentExpression) parent;
final IElementType tokenType = parentExpression.getOperationTokenType();
if (!JavaTokenType.PLUSEQ.equals(tokenType)) {
return false;
}
final PsiType parentType = parentExpression.getType();
if (parentType == null) {
return false;
}
final String parentTypeText = parentType.getCanonicalText();
return JAVA_LANG_STRING.equals(parentTypeText);
} else if (parent instanceof PsiExpressionList) {
final PsiElement grandParent = parent.getParent();
if (!(grandParent instanceof PsiMethodCallExpression)) {
return false;
}
final PsiMethodCallExpression methodCall = (PsiMethodCallExpression) grandParent;
final PsiReferenceExpression methodExpression = methodCall.getMethodExpression();
final PsiExpression qualifierExpression = methodExpression.getQualifierExpression();
final PsiType type;
if (qualifierExpression == null) {
// to use the intention inside the source of
// String and StringBuffer
type = methodExpression.getType();
} else {
type = qualifierExpression.getType();
}
if (type == null) {
return false;
}
final String className = type.getCanonicalText();
if (CommonClassNames.JAVA_LANG_STRING_BUFFER.equals(className)
|| CommonClassNames.JAVA_LANG_STRING_BUILDER.equals(className)) {
@NonNls final String methodName = methodExpression.getReferenceName();
if (!"append".equals(methodName) && !"insert".equals(methodName)) {
return false;
}
final PsiElement method = methodExpression.resolve();
return method != null;
} else if (JAVA_LANG_STRING.equals(className)) {
@NonNls final String methodName = methodExpression.getReferenceName();
if (!"indexOf".equals(methodName)
&& !"lastIndexOf".equals(methodName)
&& !"replace".equals(methodName)) {
return false;
}
final PsiElement method = methodExpression.resolve();
return method != null;
}
}
return false;
}
public static boolean areParenthesesNeeded(
PsiExpression expression,
PsiExpression parentExpression,
boolean ignoreClarifyingParentheses) {
if (parentExpression instanceof PsiParenthesizedExpression
|| parentExpression instanceof PsiArrayInitializerExpression) {
return false;
}
final int parentPrecedence = getPrecedence(parentExpression);
final int childPrecedence = getPrecedence(expression);
if (parentPrecedence > childPrecedence) {
if (ignoreClarifyingParentheses) {
if (expression instanceof PsiPolyadicExpression) {
if (parentExpression instanceof PsiPolyadicExpression
|| parentExpression instanceof PsiConditionalExpression
|| parentExpression instanceof PsiInstanceOfExpression) {
return true;
}
} else if (expression instanceof PsiInstanceOfExpression) {
return true;
}
}
return false;
}
if (parentExpression instanceof PsiPolyadicExpression
&& expression instanceof PsiPolyadicExpression) {
final PsiPolyadicExpression parentPolyadicExpression =
(PsiPolyadicExpression) parentExpression;
final PsiType parentType = parentPolyadicExpression.getType();
if (parentType == null) {
return true;
}
final PsiPolyadicExpression childPolyadicExpression = (PsiPolyadicExpression) expression;
final PsiType childType = childPolyadicExpression.getType();
if (!parentType.equals(childType)) {
return true;
}
if (childType.equalsToText(CommonClassNames.JAVA_LANG_STRING)
&& !PsiTreeUtil.isAncestor(
parentPolyadicExpression.getOperands()[0], childPolyadicExpression, true)) {
final PsiExpression[] operands = childPolyadicExpression.getOperands();
for (PsiExpression operand : operands) {
if (!childType.equals(operand.getType())) {
return true;
}
}
} else if (childType.equals(PsiType.BOOLEAN)) {
final PsiExpression[] operands = childPolyadicExpression.getOperands();
for (PsiExpression operand : operands) {
if (!PsiType.BOOLEAN.equals(operand.getType())) {
return true;
}
}
}
final IElementType parentOperator = parentPolyadicExpression.getOperationTokenType();
final IElementType childOperator = childPolyadicExpression.getOperationTokenType();
if (ignoreClarifyingParentheses) {
if (!childOperator.equals(parentOperator)) {
return true;
}
}
final PsiExpression[] parentOperands = parentPolyadicExpression.getOperands();
if (!PsiTreeUtil.isAncestor(parentOperands[0], expression, false)) {
if (!isAssociativeOperation(parentPolyadicExpression)
|| JavaTokenType.DIV == childOperator
|| JavaTokenType.PERC == childOperator) {
return true;
}
}
} else if (parentExpression instanceof PsiConditionalExpression
&& expression instanceof PsiConditionalExpression) {
final PsiConditionalExpression conditionalExpression =
(PsiConditionalExpression) parentExpression;
final PsiExpression condition = conditionalExpression.getCondition();
return PsiTreeUtil.isAncestor(condition, expression, true);
}
return parentPrecedence < childPrecedence;
}
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);
}
}
}