public void testInferInCall1() throws Exception {
PsiReferenceExpression ref = configure();
PsiType type = ref.getType();
assertTrue(type instanceof PsiClassType);
PsiType[] paramTypes = ((PsiClassType) type).getParameters();
assertEquals(1, paramTypes.length);
assertEquals(CommonClassNames.JAVA_LANG_OBJECT, paramTypes[0].getCanonicalText());
}
public void testInferInAssign1() throws Exception {
PsiReferenceExpression ref = configure();
PsiType type = ref.getType();
assertTrue(type instanceof PsiClassType);
PsiType[] paramTypes = ((PsiClassType) type).getParameters();
assertEquals(1, paramTypes.length);
assertEquals("java.lang.String", paramTypes[0].getCanonicalText());
}
/** @return true, if a declaration was introduced, false otherwise */
private static boolean replaceVariableName(
PsiElement element,
PsiReferenceExpression firstReference,
String newName,
String originalName,
StringBuilder out) {
if (element instanceof PsiReferenceExpression) {
final PsiReferenceExpression referenceExpression = (PsiReferenceExpression) element;
if (element.equals(firstReference) && isLeftSideOfSimpleAssignment(referenceExpression)) {
final PsiType type = firstReference.getType();
if (type != null) {
out.append(type.getCanonicalText());
out.append(' ');
out.append(newName);
return true;
}
}
final String text = element.getText();
if (text.equals(originalName)) {
out.append(newName);
return false;
}
}
final PsiElement[] children = element.getChildren();
if (children.length == 0) {
final String text = element.getText();
out.append(text);
} else {
boolean result = false;
for (final PsiElement child : children) {
if (result) {
out.append(child.getText());
} else {
result = replaceVariableName(child, firstReference, newName, originalName, out);
}
}
return result;
}
return false;
}
private void checkResolvesTo(@NonNls String typeName) throws Exception {
PsiReferenceExpression ref = configure();
PsiType type = ref.getType();
assertNotNull(type);
assertEquals(typeName, type.getCanonicalText());
}
@Nullable
private String createListIterationText(@NotNull PsiForStatement forStatement) {
final PsiBinaryExpression condition =
(PsiBinaryExpression) ParenthesesUtils.stripParentheses(forStatement.getCondition());
if (condition == null) {
return null;
}
final PsiExpression lhs = ParenthesesUtils.stripParentheses(condition.getLOperand());
if (lhs == null) {
return null;
}
final PsiExpression rhs = ParenthesesUtils.stripParentheses(condition.getROperand());
if (rhs == null) {
return null;
}
final IElementType tokenType = condition.getOperationTokenType();
final String indexName;
PsiExpression collectionSize;
if (JavaTokenType.LT.equals(tokenType)) {
indexName = lhs.getText();
collectionSize = rhs;
} else if (JavaTokenType.GT.equals(tokenType)) {
indexName = rhs.getText();
collectionSize = lhs;
} else {
return null;
}
if (collectionSize instanceof PsiReferenceExpression) {
final PsiReferenceExpression referenceExpression = (PsiReferenceExpression) collectionSize;
final PsiElement target = referenceExpression.resolve();
if (target instanceof PsiVariable) {
final PsiVariable variable = (PsiVariable) target;
collectionSize = ParenthesesUtils.stripParentheses(variable.getInitializer());
}
}
if (!(collectionSize instanceof PsiMethodCallExpression)) {
return null;
}
final PsiMethodCallExpression methodCallExpression =
(PsiMethodCallExpression) ParenthesesUtils.stripParentheses(collectionSize);
if (methodCallExpression == null) {
return null;
}
final PsiReferenceExpression listLengthExpression =
methodCallExpression.getMethodExpression();
final PsiExpression qualifier =
ParenthesesUtils.stripParentheses(listLengthExpression.getQualifierExpression());
final PsiReferenceExpression listReference;
if (qualifier instanceof PsiReferenceExpression) {
listReference = (PsiReferenceExpression) qualifier;
} else {
listReference = null;
}
PsiType parameterType;
if (listReference == null) {
parameterType = extractListTypeFromContainingClass(forStatement);
} else {
final PsiType type = listReference.getType();
if (type == null) {
return null;
}
parameterType = extractContentTypeFromType(type);
}
if (parameterType == null) {
parameterType = TypeUtils.getObjectType(forStatement);
}
final String typeString = parameterType.getCanonicalText();
final PsiVariable listVariable;
if (listReference == null) {
listVariable = null;
} else {
final PsiElement target = listReference.resolve();
if (!(target instanceof PsiVariable)) {
return null;
}
listVariable = (PsiVariable) target;
}
final PsiStatement body = forStatement.getBody();
final PsiStatement firstStatement = getFirstStatement(body);
final boolean isDeclaration =
isListElementDeclaration(firstStatement, listVariable, indexName, parameterType);
final String contentVariableName;
@NonNls final String finalString;
final PsiStatement statementToSkip;
if (isDeclaration) {
final PsiDeclarationStatement declarationStatement =
(PsiDeclarationStatement) firstStatement;
assert declarationStatement != null;
final PsiElement[] declaredElements = declarationStatement.getDeclaredElements();
final PsiElement declaredElement = declaredElements[0];
if (!(declaredElement instanceof PsiVariable)) {
return null;
}
final PsiVariable variable = (PsiVariable) declaredElement;
contentVariableName = variable.getName();
statementToSkip = declarationStatement;
if (variable.hasModifierProperty(PsiModifier.FINAL)) {
finalString = "final ";
} else {
finalString = "";
}
} else {
final String collectionName;
if (listReference == null) {
collectionName = null;
} else {
collectionName = listReference.getReferenceName();
}
contentVariableName = createNewVariableName(forStatement, parameterType, collectionName);
finalString = "";
statementToSkip = null;
}
@NonNls final StringBuilder out = new StringBuilder();
out.append("for(");
out.append(finalString);
out.append(typeString);
out.append(' ');
out.append(contentVariableName);
out.append(": ");
@NonNls final String listName;
if (listReference == null) {
listName = "this";
} else {
listName = listReference.getText();
}
out.append(listName);
out.append(')');
if (body != null) {
replaceCollectionGetAccess(
body, contentVariableName, listVariable, indexName, statementToSkip, out);
}
return out.toString();
}
@Nullable
private String createArrayIterationText(@NotNull PsiForStatement forStatement) {
final PsiExpression condition = forStatement.getCondition();
final PsiBinaryExpression strippedCondition =
(PsiBinaryExpression) ParenthesesUtils.stripParentheses(condition);
if (strippedCondition == null) {
return null;
}
final PsiExpression lhs = ParenthesesUtils.stripParentheses(strippedCondition.getLOperand());
if (lhs == null) {
return null;
}
final PsiExpression rhs = ParenthesesUtils.stripParentheses(strippedCondition.getROperand());
if (rhs == null) {
return null;
}
final IElementType tokenType = strippedCondition.getOperationTokenType();
final PsiReferenceExpression arrayLengthExpression;
final String indexName;
if (tokenType.equals(JavaTokenType.LT)) {
arrayLengthExpression = (PsiReferenceExpression) ParenthesesUtils.stripParentheses(rhs);
indexName = lhs.getText();
} else if (tokenType.equals(JavaTokenType.GT)) {
arrayLengthExpression = (PsiReferenceExpression) ParenthesesUtils.stripParentheses(lhs);
indexName = rhs.getText();
} else {
return null;
}
if (arrayLengthExpression == null) {
return null;
}
PsiReferenceExpression arrayReference =
(PsiReferenceExpression) arrayLengthExpression.getQualifierExpression();
if (arrayReference == null) {
final PsiElement target = arrayLengthExpression.resolve();
if (!(target instanceof PsiVariable)) {
return null;
}
final PsiVariable variable = (PsiVariable) target;
final PsiExpression initializer = variable.getInitializer();
if (!(initializer instanceof PsiReferenceExpression)) {
return null;
}
final PsiReferenceExpression referenceExpression = (PsiReferenceExpression) initializer;
arrayReference = (PsiReferenceExpression) referenceExpression.getQualifierExpression();
if (arrayReference == null) {
return null;
}
}
final PsiType type = arrayReference.getType();
if (!(type instanceof PsiArrayType)) {
return null;
}
final PsiArrayType arrayType = (PsiArrayType) type;
final PsiType componentType = arrayType.getComponentType();
final String typeText = componentType.getCanonicalText();
final PsiElement target = arrayReference.resolve();
if (!(target instanceof PsiVariable)) {
return null;
}
final PsiVariable arrayVariable = (PsiVariable) target;
final PsiStatement body = forStatement.getBody();
final PsiStatement firstStatement = getFirstStatement(body);
final boolean isDeclaration =
isArrayElementDeclaration(firstStatement, arrayVariable, indexName);
final String contentVariableName;
@NonNls final String finalString;
final PsiStatement statementToSkip;
if (isDeclaration) {
final PsiDeclarationStatement declarationStatement =
(PsiDeclarationStatement) firstStatement;
assert declarationStatement != null;
final PsiElement[] declaredElements = declarationStatement.getDeclaredElements();
final PsiElement declaredElement = declaredElements[0];
if (!(declaredElement instanceof PsiVariable)) {
return null;
}
final PsiVariable variable = (PsiVariable) declaredElement;
if (VariableAccessUtils.variableIsAssigned(variable, forStatement)) {
final String collectionName = arrayReference.getReferenceName();
contentVariableName = createNewVariableName(forStatement, componentType, collectionName);
final Project project = forStatement.getProject();
final CodeStyleSettings codeStyleSettings = CodeStyleSettingsManager.getSettings(project);
if (codeStyleSettings.GENERATE_FINAL_LOCALS) {
finalString = "final ";
} else {
finalString = "";
}
statementToSkip = null;
} else {
contentVariableName = variable.getName();
statementToSkip = declarationStatement;
if (variable.hasModifierProperty(PsiModifier.FINAL)) {
finalString = "final ";
} else {
finalString = "";
}
}
} else {
final String collectionName = arrayReference.getReferenceName();
contentVariableName = createNewVariableName(forStatement, componentType, collectionName);
final Project project = forStatement.getProject();
final CodeStyleSettings codeStyleSettings = CodeStyleSettingsManager.getSettings(project);
if (codeStyleSettings.GENERATE_FINAL_LOCALS) {
finalString = "final ";
} else {
finalString = "";
}
statementToSkip = null;
}
@NonNls final StringBuilder out = new StringBuilder();
out.append("for(");
out.append(finalString);
out.append(typeText);
out.append(' ');
out.append(contentVariableName);
out.append(": ");
final String arrayName = arrayReference.getText();
out.append(arrayName);
out.append(')');
if (body != null) {
replaceArrayAccess(
body, contentVariableName, arrayVariable, indexName, statementToSkip, out);
}
return out.toString();
}
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;
}
@Override
public void doFix(Project project, ProblemDescriptor descriptor)
throws IncorrectOperationException {
final PsiReferenceExpression parameterReference =
(PsiReferenceExpression) descriptor.getPsiElement();
final PsiElement target = parameterReference.resolve();
if (!(target instanceof PsiParameter)) {
return;
}
final PsiParameter parameter = (PsiParameter) target;
final PsiElement declarationScope = parameter.getDeclarationScope();
final PsiElement body;
if (declarationScope instanceof PsiMethod) {
final PsiMethod method = (PsiMethod) declarationScope;
body = method.getBody();
} else if (declarationScope instanceof PsiCatchSection) {
final PsiCatchSection catchSection = (PsiCatchSection) declarationScope;
body = catchSection.getCatchBlock();
} else if (declarationScope instanceof PsiLoopStatement) {
final PsiLoopStatement forStatement = (PsiLoopStatement) declarationScope;
final PsiStatement forBody = forStatement.getBody();
if (forBody instanceof PsiBlockStatement) {
final PsiBlockStatement blockStatement = (PsiBlockStatement) forBody;
body = blockStatement.getCodeBlock();
} else {
body = forBody;
}
} else {
return;
}
if (body == null) {
return;
}
final CodeStyleManager codeStyleManager = CodeStyleManager.getInstance(project);
final String parameterName = parameterReference.getText();
final JavaCodeStyleManager javaCodeStyleManager = JavaCodeStyleManager.getInstance(project);
final String variableName =
javaCodeStyleManager.suggestUniqueVariableName(parameterName, parameterReference, true);
final SearchScope scope = parameter.getUseScope();
final Query<PsiReference> search = ReferencesSearch.search(parameter, scope);
final PsiReference reference = search.findFirst();
if (reference == null) {
return;
}
final PsiElement element = reference.getElement();
if (!(element instanceof PsiReferenceExpression)) {
return;
}
final PsiReferenceExpression firstReference = (PsiReferenceExpression) element;
final PsiElement[] children = body.getChildren();
final int startIndex;
final int endIndex;
if (body instanceof PsiCodeBlock) {
startIndex = 1;
endIndex = children.length - 1;
} else {
startIndex = 0;
endIndex = children.length;
}
boolean newDeclarationCreated = false;
final StringBuilder buffer = new StringBuilder();
for (int i = startIndex; i < endIndex; i++) {
final PsiElement child = children[i];
newDeclarationCreated |=
replaceVariableName(child, firstReference, variableName, parameterName, buffer);
}
final String replacementText;
if (newDeclarationCreated) {
replacementText = "{" + buffer + '}';
} else {
final PsiType type = parameterReference.getType();
if (type == null) {
return;
}
final String className = type.getCanonicalText();
replacementText =
'{' + className + ' ' + variableName + " = " + parameterName + ';' + buffer + '}';
}
final PsiElementFactory elementFactory = JavaPsiFacade.getInstance(project).getElementFactory();
final PsiCodeBlock block = elementFactory.createCodeBlockFromText(replacementText, null);
body.replace(block);
codeStyleManager.reformat(declarationScope);
}