org.jetbrains.kotlin.psi.KtPsiUtil Maven / Gradle / Ivy
/*
* Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.psi;
import com.google.common.collect.Lists;
import com.intellij.lang.ASTNode;
import com.intellij.psi.PsiComment;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiWhiteSpace;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.codeInsight.CommentUtilCore;
import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.KtNodeTypes;
import org.jetbrains.kotlin.builtins.StandardNames;
import org.jetbrains.kotlin.kdoc.psi.api.KDocElement;
import org.jetbrains.kotlin.lexer.KtToken;
import org.jetbrains.kotlin.lexer.KtTokens;
import org.jetbrains.kotlin.name.Name;
import org.jetbrains.kotlin.name.SpecialNames;
import org.jetbrains.kotlin.parsing.KotlinExpressionParsing;
import org.jetbrains.kotlin.psi.psiUtil.KtPsiUtilKt;
import org.jetbrains.kotlin.resolve.StatementFilter;
import org.jetbrains.kotlin.resolve.StatementFilterKt;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.function.Predicate;
public class KtPsiUtil {
private KtPsiUtil() {
}
public interface KtExpressionWrapper {
KtExpression getBaseExpression();
}
public static void visitChildren(@NotNull KtElement element, @NotNull KtVisitor visitor, D data) {
PsiElement child = element.getFirstChild();
while (child != null) {
if (child instanceof KtElement) {
((KtElement) child).accept(visitor, data);
}
child = child.getNextSibling();
}
}
@NotNull
public static KtExpression safeDeparenthesize(@NotNull KtExpression expression) {
return safeDeparenthesize(expression, false);
}
@NotNull
public static KtExpression safeDeparenthesize(@NotNull KtExpression expression, boolean keepAnnotations) {
KtExpression deparenthesized = deparenthesize(expression, keepAnnotations);
return deparenthesized != null ? deparenthesized : expression;
}
@Nullable
public static KtExpression deparenthesize(@Nullable KtExpression expression) {
return deparenthesize(expression, false);
}
@Nullable
public static KtExpression deparenthesize(@Nullable KtExpression expression, boolean keepAnnotations) {
while (true) {
KtExpression baseExpression = deparenthesizeOnce(expression, keepAnnotations);
if (baseExpression == expression) return baseExpression;
expression = baseExpression;
}
}
@Nullable
public static KtExpression deparenthesizeOnce(
@Nullable KtExpression expression
) {
return deparenthesizeOnce(expression, false);
}
@Nullable
public static KtExpression deparenthesizeOnce(
@Nullable KtExpression expression, boolean keepAnnotations
) {
if (expression instanceof KtAnnotatedExpression && !keepAnnotations) {
return ((KtAnnotatedExpression) expression).getBaseExpression();
}
else if (expression instanceof KtLabeledExpression) {
return ((KtLabeledExpression) expression).getBaseExpression();
}
else if (expression instanceof KtExpressionWrapper) {
return ((KtExpressionWrapper) expression).getBaseExpression();
}
else if (expression instanceof KtParenthesizedExpression) {
return ((KtParenthesizedExpression) expression).getExpression();
}
return expression;
}
@NotNull
public static Name safeName(@Nullable String name) {
return name == null ? SpecialNames.NO_NAME_PROVIDED : Name.identifier(name);
}
@NotNull
public static Set findRootExpressions(@NotNull Collection unreachableElements) {
Set rootElements = new HashSet<>();
Set shadowedElements = new HashSet<>();
KtVisitorVoid shadowAllChildren = new KtVisitorVoid() {
@Override
public void visitKtElement(@NotNull KtElement element) {
if (shadowedElements.add(element)) {
element.acceptChildren(this);
}
}
};
for (KtElement element : unreachableElements) {
if (shadowedElements.contains(element)) continue;
element.acceptChildren(shadowAllChildren);
rootElements.removeAll(shadowedElements);
rootElements.add(element);
}
return rootElements;
}
@NotNull
public static String unquoteIdentifier(@NotNull String quoted) {
if (quoted.indexOf('`') < 0) {
return quoted;
}
if (quoted.startsWith("`") && quoted.endsWith("`") && quoted.length() >= 2) {
return quoted.substring(1, quoted.length() - 1);
}
else {
return quoted;
}
}
@NotNull
public static String unquoteIdentifierOrFieldReference(@NotNull String quoted) {
if (quoted.indexOf('`') < 0) {
return quoted;
}
if (quoted.startsWith("$")) {
return "$" + unquoteIdentifier(quoted.substring(1));
}
else {
return unquoteIdentifier(quoted);
}
}
public static boolean isDeprecated(@NotNull KtModifierListOwner owner) {
KtModifierList modifierList = owner.getModifierList();
if (modifierList != null) {
List annotationEntries = modifierList.getAnnotationEntries();
for (KtAnnotationEntry annotation : annotationEntries) {
Name shortName = annotation.getShortName();
if (StandardNames.FqNames.deprecated.shortName().equals(shortName)) {
return true;
}
}
}
return false;
}
@Nullable
public static T getDirectParentOfTypeForBlock(@NotNull KtBlockExpression block, @NotNull Class aClass) {
T parent = PsiTreeUtil.getParentOfType(block, aClass);
if (parent instanceof KtIfExpression) {
KtIfExpression ifExpression = (KtIfExpression) parent;
if (ifExpression.getElse() == block || ifExpression.getThen() == block) {
return parent;
}
}
if (parent instanceof KtWhenExpression) {
KtWhenExpression whenExpression = (KtWhenExpression) parent;
for (KtWhenEntry whenEntry : whenExpression.getEntries()) {
if (whenEntry.getExpression() == block) {
return parent;
}
}
}
if (parent instanceof KtFunctionLiteral) {
KtFunctionLiteral functionLiteral = (KtFunctionLiteral) parent;
if (functionLiteral.getBodyExpression() == block) {
return parent;
}
}
if (parent instanceof KtTryExpression) {
KtTryExpression tryExpression = (KtTryExpression) parent;
if (tryExpression.getTryBlock() == block) {
return parent;
}
for (KtCatchClause clause : tryExpression.getCatchClauses()) {
if (clause.getCatchBody() == block) {
return parent;
}
}
}
return null;
}
@Nullable
public static KtSimpleNameExpression getLastReference(@NotNull KtExpression importedReference) {
KtElement selector = KtPsiUtilKt.getQualifiedElementSelector(importedReference);
return selector instanceof KtSimpleNameExpression ? (KtSimpleNameExpression) selector : null;
}
public static boolean isSelectorInQualified(@NotNull KtSimpleNameExpression nameExpression) {
KtElement qualifiedElement = KtPsiUtilKt.getQualifiedElement(nameExpression);
return qualifiedElement instanceof KtQualifiedExpression
|| ((qualifiedElement instanceof KtUserType) && ((KtUserType) qualifiedElement).getQualifier() != null);
}
public static boolean isLHSOfDot(@NotNull KtExpression expression) {
PsiElement parent = expression.getParent();
if (!(parent instanceof KtQualifiedExpression)) return false;
KtQualifiedExpression qualifiedParent = (KtQualifiedExpression) parent;
return qualifiedParent.getReceiverExpression() == expression || isLHSOfDot(qualifiedParent);
}
public static boolean isScriptDeclaration(@NotNull KtDeclaration namedDeclaration) {
return getScript(namedDeclaration) != null;
}
@Nullable
public static KtScript getScript(@NotNull KtDeclaration namedDeclaration) {
PsiElement parent = namedDeclaration.getParent();
if (parent != null && parent.getParent() instanceof KtScript) {
return (KtScript) parent.getParent();
}
else {
return null;
}
}
public static boolean isRemovableVariableDeclaration(@NotNull KtDeclaration declaration) {
if (!(declaration instanceof KtVariableDeclaration)) return false;
if (declaration instanceof KtProperty) return true;
assert declaration instanceof KtDestructuringDeclarationEntry;
// We can always replace destructuring entry with _
return true;
}
@Nullable
@SafeVarargs
@Contract("null, _ -> null")
public static PsiElement getTopmostParentOfTypes(
@Nullable PsiElement element,
@NotNull Class... parentTypes
) {
if (element instanceof PsiFile) return null;
PsiElement answer = PsiTreeUtil.getParentOfType(element, parentTypes);
if (answer instanceof PsiFile) return answer;
do {
PsiElement next = PsiTreeUtil.getParentOfType(answer, parentTypes);
if (next == null) break;
answer = next;
}
while (true);
return answer;
}
public static boolean isNullConstant(@NotNull KtExpression expression) {
KtExpression deparenthesized = deparenthesize(expression);
return deparenthesized instanceof KtConstantExpression && deparenthesized.getNode().getElementType() == KtNodeTypes.NULL;
}
public static boolean isTrueConstant(@Nullable KtExpression condition) {
return isBooleanConstant(condition) && condition.getNode().findChildByType(KtTokens.TRUE_KEYWORD) != null;
}
public static boolean isFalseConstant(@Nullable KtExpression condition) {
return isBooleanConstant(condition) && condition.getNode().findChildByType(KtTokens.FALSE_KEYWORD) != null;
}
public static boolean isBooleanConstant(@Nullable KtExpression condition) {
return condition != null && condition.getNode().getElementType() == KtNodeTypes.BOOLEAN_CONSTANT;
}
public static boolean isAbstract(@NotNull KtDeclarationWithBody declaration) {
return declaration.getBodyExpression() == null;
}
@Nullable
public static KtExpression getExpressionOrLastStatementInBlock(@Nullable KtExpression expression) {
if (expression instanceof KtBlockExpression) {
return getLastStatementInABlock((KtBlockExpression) expression);
}
return expression;
}
@Nullable
public static KtExpression getLastStatementInABlock(@Nullable KtBlockExpression blockExpression) {
if (blockExpression == null) return null;
List statements = blockExpression.getStatements();
return statements.isEmpty() ? null : statements.get(statements.size() - 1);
}
public static boolean isTrait(@NotNull KtClassOrObject classOrObject) {
return classOrObject instanceof KtClass && ((KtClass) classOrObject).isInterface();
}
@Nullable
public static KtClassOrObject getOutermostClassOrObject(@NotNull KtClassOrObject classOrObject) {
KtClassOrObject current = classOrObject;
while (true) {
PsiElement parent = current.getParent();
assert parent != null : "Class with no parent: " + current.getText();
if (parent instanceof PsiFile) {
return current;
}
if (!(parent instanceof KtClassBody)) {
// It is a local class, no legitimate outer
return current;
}
current = (KtClassOrObject) parent.getParent();
}
}
@Nullable
public static KtClassOrObject getClassIfParameterIsProperty(@NotNull KtParameter ktParameter) {
if (ktParameter.hasValOrVar()) {
PsiElement grandParent = ktParameter.getParent().getParent();
if (grandParent instanceof KtPrimaryConstructor) {
return ((KtPrimaryConstructor) grandParent).getContainingClassOrObject();
}
}
return null;
}
@Nullable
private static IElementType getOperation(@NotNull KtExpression expression) {
if (expression instanceof KtQualifiedExpression) {
return ((KtQualifiedExpression) expression).getOperationSign();
}
else if (expression instanceof KtOperationExpression) {
return ((KtOperationExpression) expression).getOperationReference().getReferencedNameElementType();
}
return null;
}
private static int getPriority(@NotNull KtExpression expression) {
int maxPriority = KotlinExpressionParsing.Precedence.values().length + 1;
// same as postfix operations
if (expression instanceof KtPostfixExpression ||
expression instanceof KtQualifiedExpression ||
expression instanceof KtCallExpression ||
expression instanceof KtArrayAccessExpression ||
expression instanceof KtDoubleColonExpression) {
return maxPriority - 1;
}
if (expression instanceof KtPrefixExpression || expression instanceof KtLabeledExpression) return maxPriority - 2;
if (expression instanceof KtIfExpression) {
return KotlinExpressionParsing.Precedence.ASSIGNMENT.ordinal();
}
if (expression instanceof KtSuperExpression) {
return maxPriority;
}
if (expression instanceof KtDeclaration || expression instanceof KtStatementExpression) {
return 0;
}
IElementType operation = getOperation(expression);
for (KotlinExpressionParsing.Precedence precedence : KotlinExpressionParsing.Precedence.values()) {
if (precedence != KotlinExpressionParsing.Precedence.PREFIX && precedence != KotlinExpressionParsing.Precedence.POSTFIX &&
precedence.getOperations().contains(operation)) {
return maxPriority - precedence.ordinal() - 1;
}
}
return maxPriority;
}
@SuppressWarnings("unused") // used in intellij repo
public static boolean areParenthesesUseless(@NotNull KtParenthesizedExpression expression) {
KtExpression innerExpression = expression.getExpression();
if (innerExpression == null) return true;
PsiElement parent = expression.getParent();
if (!(parent instanceof KtElement)) return true;
return !areParenthesesNecessary(innerExpression, expression, (KtElement) parent);
}
public static boolean areParenthesesNecessary(
@NotNull KtExpression innerExpression,
@NotNull KtExpression currentInner,
@NotNull KtElement parentElement
) {
if (parentElement instanceof KtDelegatedSuperTypeEntry) return true;
if (parentElement instanceof KtParenthesizedExpression || innerExpression instanceof KtParenthesizedExpression) {
return false;
}
if (parentElement instanceof KtPackageDirective) return false;
if (parentElement instanceof KtWhenExpression || innerExpression instanceof KtWhenExpression) {
return false;
}
if (parentElement instanceof KtCollectionLiteralExpression) return false;
if (innerExpression instanceof KtIfExpression) {
if (parentElement instanceof KtQualifiedExpression) return true;
PsiElement current = parentElement;
while (!(current instanceof KtBlockExpression || current instanceof KtDeclaration || current instanceof KtStatementExpression || current instanceof KtFile)) {
if (current.getTextRange().getEndOffset() != currentInner.getTextRange().getEndOffset()) {
return !(current instanceof KtParenthesizedExpression) && !(current instanceof KtValueArgumentList); // if current expression is "guarded" by parenthesis, no extra parenthesis is necessary
}
current = current.getParent();
}
}
if (innerExpression instanceof KtLambdaExpression) {
PsiElement prevSibling = PsiTreeUtil.skipWhitespacesAndCommentsBackward(currentInner);
if (endWithParenthesisOrCallExpression(prevSibling)) return true;
}
if (parentElement instanceof KtCallExpression && currentInner == ((KtCallExpression) parentElement).getCalleeExpression()) {
KtCallExpression parentCall = (KtCallExpression) parentElement;
KtExpression targetInnerExpression = innerExpression;
if (targetInnerExpression instanceof KtDotQualifiedExpression) {
KtExpression selector = ((KtDotQualifiedExpression) targetInnerExpression).getSelectorExpression();
if (selector != null) {
targetInnerExpression = selector;
}
}
if (targetInnerExpression instanceof KtSimpleNameExpression) return false;
if (KtPsiUtilKt.getQualifiedExpressionForSelector(parentElement) != null) return true;
if (targetInnerExpression instanceof KtCallExpression && parentCall.getValueArgumentList() == null) return true;
return !(targetInnerExpression instanceof KtThisExpression
|| targetInnerExpression instanceof KtArrayAccessExpression
|| targetInnerExpression instanceof KtConstantExpression
|| targetInnerExpression instanceof KtStringTemplateExpression
|| targetInnerExpression instanceof KtCallExpression);
}
if (parentElement instanceof KtValueArgument) {
// a(___, d > (e + f)) => a((b < c), d > (e + f)) to prevent parsing < c, d > as type argument list
KtValueArgument nextArg = PsiTreeUtil.getNextSiblingOfType(parentElement, KtValueArgument.class);
PsiElement nextExpression = nextArg != null ? nextArg.getArgumentExpression() : null;
if (innerExpression instanceof KtBinaryExpression &&
((KtBinaryExpression) innerExpression).getOperationToken() == KtTokens.LT &&
nextExpression instanceof KtBinaryExpression &&
((KtBinaryExpression) nextExpression).getOperationToken() == KtTokens.GT) return true;
}
IElementType innerOperation = getOperation(innerExpression);
if (innerExpression instanceof KtBinaryExpression) {
// '(x operator return [...]) operator ...' case
if (parentElement instanceof KtBinaryExpression) {
KtBinaryExpression innerBinary = (KtBinaryExpression) innerExpression;
if (innerBinary.getRight() instanceof KtReturnExpression) {
return true;
}
}
// '(x operator y)' case
if (innerOperation != KtTokens.ELVIS &&
!(parentElement instanceof KtValueArgument) &&
!(parentElement instanceof KtParameter) &&
!(parentElement instanceof KtBlockStringTemplateEntry) &&
!(parentElement instanceof KtContainerNode &&
// for `if` branch, `else` branch, loops body and `when` entry parentheses are required
!(parentElement instanceof KtContainerNodeForControlStructureBody)) &&
isKeepBinaryExpressionParenthesized((KtBinaryExpression) innerExpression)) {
return true;
}
}
if (!(parentElement instanceof KtExpression)) return false;
IElementType parentOperation = getOperation((KtExpression) parentElement);
// 'return (@label{...})' case
if (parentElement instanceof KtReturnExpression
&& (innerExpression instanceof KtLabeledExpression || innerExpression instanceof KtAnnotatedExpression)) return true;
// '(x: Int) < y' case
if (innerExpression instanceof KtBinaryExpressionWithTypeRHS && parentOperation == KtTokens.LT) {
return true;
}
if (parentElement instanceof KtLabeledExpression) return false;
// 'x ?: ...' case
if (parentElement instanceof KtBinaryExpression &&
parentOperation == KtTokens.ELVIS &&
!(innerExpression instanceof KtBinaryExpression) &&
currentInner == ((KtBinaryExpression) parentElement).getRight()) {
return false;
}
// 'x = fun {}' case
if (parentElement instanceof KtBinaryExpression &&
parentOperation == KtTokens.EQ &&
innerExpression instanceof KtNamedFunction &&
currentInner == ((KtBinaryExpression) parentElement).getRight()) {
return false;
}
int innerPriority = getPriority(innerExpression);
int parentPriority = getPriority((KtExpression) parentElement);
if (innerPriority == parentPriority) {
if (parentElement instanceof KtBinaryExpression) {
if (innerOperation == KtTokens.ANDAND || innerOperation == KtTokens.OROR) {
return false;
}
return ((KtBinaryExpression) parentElement).getRight() == currentInner;
}
if (parentElement instanceof KtPrefixExpression && innerExpression instanceof KtPrefixExpression) {
// +(++x) or +(+x) case
if (parentOperation == KtTokens.PLUS) {
return innerOperation == KtTokens.PLUS || innerOperation == KtTokens.PLUSPLUS;
}
// -(--x) or -(-x) case
if (parentOperation == KtTokens.MINUS) {
return innerOperation == KtTokens.MINUS || innerOperation == KtTokens.MINUSMINUS;
}
}
return false;
}
return innerPriority < parentPriority;
}
private static boolean endWithParenthesisOrCallExpression(PsiElement element) {
if (element == null) return false;
if (element.getText().endsWith(KtTokens.RPAR.getValue()) || element instanceof KtCallExpression) return true;
PsiElement[] children = element.getChildren();
int length = children.length;
if (length == 0) return false;
return endWithParenthesisOrCallExpression(children[length - 1]);
}
private static boolean isKeepBinaryExpressionParenthesized(KtBinaryExpression expression) {
PsiElement expr = expression.getFirstChild();
while (expr != null) {
if (expr instanceof PsiWhiteSpace && expr.textContains('\n')) {
return true;
}
if (expr instanceof KtOperationReferenceExpression) {
break;
}
expr = expr.getNextSibling();
}
return (expression.getRight() instanceof KtBinaryExpression && isKeepBinaryExpressionParenthesized((KtBinaryExpression) expression.getRight())) ||
(expression.getLeft() instanceof KtBinaryExpression && isKeepBinaryExpressionParenthesized((KtBinaryExpression) expression.getLeft()));
}
public static boolean isAssignment(@NotNull PsiElement element) {
return element instanceof KtBinaryExpression &&
KtTokens.ALL_ASSIGNMENTS.contains(((KtBinaryExpression) element).getOperationToken());
}
public static boolean isOrdinaryAssignment(@NotNull PsiElement element) {
return element instanceof KtBinaryExpression &&
((KtBinaryExpression) element).getOperationToken().equals(KtTokens.EQ);
}
public static boolean isCast(@NotNull KtBinaryExpressionWithTypeRHS expression) {
return isSafeCast(expression) || isUnsafeCast(expression);
}
public static boolean isSafeCast(@NotNull KtBinaryExpressionWithTypeRHS expression) {
return expression.getOperationReference().getReferencedNameElementType() == KtTokens.AS_SAFE;
}
public static boolean isUnsafeCast(@NotNull KtBinaryExpressionWithTypeRHS expression) {
return expression.getOperationReference().getReferencedNameElementType() == KtTokens.AS_KEYWORD;
}
public static boolean checkVariableDeclarationInBlock(@NotNull KtBlockExpression block, @NotNull String varName) {
for (KtExpression element : block.getStatements()) {
if (element instanceof KtVariableDeclaration) {
if (((KtVariableDeclaration) element).getNameAsSafeName().asString().equals(varName)) {
return true;
}
}
}
return false;
}
public static boolean checkWhenExpressionHasSingleElse(@NotNull KtWhenExpression whenExpression) {
int elseCount = 0;
for (KtWhenEntry entry : whenExpression.getEntries()) {
if (entry.isElse()) {
elseCount++;
}
}
return (elseCount == 1);
}
@Nullable
public static PsiElement skipTrailingWhitespacesAndComments(@Nullable PsiElement element) {
return PsiTreeUtil.skipSiblingsForward(element, PsiWhiteSpace.class, PsiComment.class);
}
@Nullable
public static PsiElement prevLeafIgnoringWhitespaceAndComments(@NotNull PsiElement element) {
PsiElement prev = PsiTreeUtil.prevLeaf(element, true);
while (prev != null && KtTokens.WHITE_SPACE_OR_COMMENT_BIT_SET.contains(prev.getNode().getElementType())) {
prev = PsiTreeUtil.prevLeaf(prev, true);
}
return prev;
}
@Nullable
public static PsiElement getPreviousWord(@NotNull PsiElement element, @NotNull String word) {
PsiElement prev = prevLeafIgnoringWhitespaceAndComments(element);
if (prev != null && prev.getNode().getElementType() == KtTokens.IDENTIFIER && word.equals(prev.getText())) {
return prev;
}
return null;
}
@NotNull
public static String getText(@Nullable PsiElement element) {
return element != null ? element.getText() : "";
}
@Nullable
public static String getNullableText(@Nullable PsiElement element) {
return element != null ? element.getText() : null;
}
/**
* CommentUtilCore.isComment fails if element inside comment.
*
* Also, we can not add KDocTokens to COMMENTS TokenSet, because it is used in KotlinParserDefinition.getCommentTokens(),
* and therefor all COMMENTS tokens will be ignored by PsiBuilder.
*
* @param element
* @return
*/
public static boolean isInComment(PsiElement element) {
return CommentUtilCore.isComment(element) || element instanceof KDocElement;
}
@Nullable
public static PsiElement getOutermostParent(@NotNull PsiElement element, @NotNull PsiElement upperBound, boolean strict) {
PsiElement parent = strict ? element.getParent() : element;
while (parent != null && parent.getParent() != upperBound) {
parent = parent.getParent();
}
return parent;
}
@SafeVarargs
@SuppressWarnings("unchecked")
public static T getLastChildByType(@NotNull PsiElement root, @NotNull Class... elementTypes) {
PsiElement[] children = root.getChildren();
for (int i = children.length - 1; i >= 0; i--) {
if (PsiTreeUtil.instanceOf(children[i], elementTypes)) {
return (T) children[i];
}
}
return null;
}
@Nullable
public static KtElement getOutermostDescendantElement(
@Nullable PsiElement root,
boolean first,
@NotNull Predicate predicate
) {
if (!(root instanceof KtElement)) return null;
List results = Lists.newArrayList();
root.accept(
new KtVisitorVoid() {
@Override
public void visitKtElement(@NotNull KtElement element) {
if (predicate.test(element)) {
//noinspection unchecked
results.add(element);
}
else {
element.acceptChildren(this);
}
}
}
);
if (results.isEmpty()) return null;
return first ? results.get(0) : results.get(results.size() - 1);
}
@Nullable
public static PsiElement findChildByType(@NotNull PsiElement element, @NotNull IElementType type) {
ASTNode node = element.getNode().findChildByType(type);
return node == null ? null : node.getPsi();
}
@Nullable
public static PsiElement skipSiblingsBackwardByPredicate(@Nullable PsiElement element, Predicate elementsToSkip) {
if (element == null) return null;
for (PsiElement e = element.getPrevSibling(); e != null; e = e.getPrevSibling()) {
if (elementsToSkip.test(e)) continue;
return e;
}
return null;
}
public static PsiElement ascendIfPropertyAccessor(PsiElement element) {
if (element instanceof KtPropertyAccessor) {
return element.getParent();
}
return element;
}
@Nullable
@Contract("_, !null -> !null")
public static KtModifierList replaceModifierList(@NotNull KtModifierListOwner owner, @Nullable KtModifierList modifierList) {
KtModifierList oldModifierList = owner.getModifierList();
if (modifierList == null) {
if (oldModifierList != null) oldModifierList.delete();
return null;
}
else {
if (oldModifierList == null) {
PsiElement firstChild = owner.getFirstChild();
return (KtModifierList) owner.addBefore(modifierList, firstChild);
}
else {
return (KtModifierList) oldModifierList.replace(modifierList);
}
}
}
@Nullable
public static String getPackageName(@NotNull KtElement element) {
KtFile file = element.getContainingKtFile();
KtPackageDirective header = PsiTreeUtil.findChildOfType(file, KtPackageDirective.class);
return header != null ? header.getQualifiedName() : null;
}
@Nullable
public static KtElement getEnclosingElementForLocalDeclaration(@NotNull KtDeclaration declaration) {
return getEnclosingElementForLocalDeclaration(declaration, true);
}
private static boolean isMemberOfObjectExpression(@NotNull KtCallableDeclaration propertyOrFunction) {
PsiElement parent = PsiTreeUtil.getStubOrPsiParent(propertyOrFunction);
if (!(parent instanceof KtClassBody)) return false;
PsiElement grandparent = PsiTreeUtil.getStubOrPsiParent(parent);
if (!(grandparent instanceof KtObjectDeclaration)) return false;
return PsiTreeUtil.getStubOrPsiParent(grandparent) instanceof KtObjectLiteralExpression;
}
private static boolean isNonLocalCallable(@Nullable KtDeclaration declaration) {
if (declaration instanceof KtProperty) {
return !((KtProperty) declaration).isLocal();
}
else if (declaration instanceof KtFunction) {
return !((KtFunction) declaration).isLocal();
}
return false;
}
@Nullable
public static KtElement getEnclosingElementForLocalDeclaration(@NotNull KtDeclaration declaration, boolean skipParameters) {
if (declaration instanceof KtTypeParameter && skipParameters) {
declaration = PsiTreeUtil.getParentOfType(declaration, KtNamedDeclaration.class);
}
else if (declaration instanceof KtParameter) {
KtFunctionType functionType = PsiTreeUtil.getParentOfType(declaration, KtFunctionType.class);
if (functionType != null) {
return functionType;
}
PsiElement parent = declaration.getParent();
// val/var parameter of primary constructor should be considered as local according to containing class
if (((KtParameter) declaration).hasValOrVar() && parent != null && parent.getParent() instanceof KtPrimaryConstructor) {
return getEnclosingElementForLocalDeclaration(((KtPrimaryConstructor) parent.getParent()).getContainingClassOrObject(), skipParameters);
}
else if (skipParameters && parent != null &&
!(parent instanceof KtForExpression) &&
parent.getParent() instanceof KtNamedFunction) {
declaration = (KtNamedFunction) parent.getParent();
}
}
if (declaration instanceof PsiFile) {
return declaration;
}
// No appropriate stub-tolerant method in PsiTreeUtil, nor JetStubbedPsiUtil, writing manually
PsiElement current = PsiTreeUtil.getStubOrPsiParent(declaration);
boolean isNonLocalCallable = isNonLocalCallable(declaration);
while (current != null) {
PsiElement parent = PsiTreeUtil.getStubOrPsiParent(current);
if (parent instanceof KtScript) return null;
if (current instanceof KtAnonymousInitializer) {
return ((KtAnonymousInitializer) current).getBody();
}
if (current instanceof KtProperty || current instanceof KtFunction) {
if (parent instanceof KtFile) {
return (KtElement) current;
}
else if (parent instanceof KtClassBody && !isMemberOfObjectExpression((KtCallableDeclaration) current)) {
return (KtElement) parent;
}
else if (parent instanceof KtBlockExpression) {
PsiElement grandParent = parent.getParent();
if (grandParent instanceof KtScript) {
return (KtElement) parent;
}
}
}
if (current instanceof KtParameter) {
return (KtElement) current;
}
if (current instanceof KtValueArgument) {
// for members, value argument is never enough, see KT-10546
if (!isNonLocalCallable) {
return (KtElement) current;
}
}
if (current instanceof KtBlockExpression) {
// For members also not applicable if has function literal parent
if (!isNonLocalCallable || !(current.getParent() instanceof KtFunctionLiteral)) {
return (KtElement) current;
}
}
if (current instanceof KtDelegatedSuperTypeEntry || current instanceof KtSuperTypeCallEntry) {
PsiElement grandParent = current.getParent().getParent();
if (grandParent instanceof KtClassOrObject && !(grandParent.getParent() instanceof KtObjectLiteralExpression)) {
return (KtElement) grandParent;
}
}
current = parent;
}
return null;
}
public static boolean isLocal(@NotNull KtDeclaration declaration) {
return getEnclosingElementForLocalDeclaration(declaration) != null;
}
@Nullable
public static KtToken getOperationToken(@NotNull KtOperationExpression expression) {
KtSimpleNameExpression operationExpression = expression.getOperationReference();
IElementType elementType = operationExpression.getReferencedNameElementType();
assert elementType == null || elementType instanceof KtToken :
"KtOperationExpression should have operation token of type KtToken: " +
expression;
return (KtToken) elementType;
}
public static boolean isLabelIdentifierExpression(PsiElement element) {
return element instanceof KtLabelReferenceExpression;
}
@Nullable
public static KtExpression getParentCallIfPresent(@NotNull KtExpression expression) {
PsiElement parent = expression.getParent();
while (parent != null) {
if (parent instanceof KtBinaryExpression ||
parent instanceof KtUnaryExpression ||
parent instanceof KtLabeledExpression ||
parent instanceof KtDotQualifiedExpression ||
parent instanceof KtCallExpression ||
parent instanceof KtArrayAccessExpression ||
parent instanceof KtDestructuringDeclaration) {
if (parent instanceof KtLabeledExpression) {
parent = parent.getParent();
continue;
}
//check that it's in inlineable call would be in resolve call of parent
return (KtExpression) parent;
}
else if (parent instanceof KtParenthesizedExpression || parent instanceof KtBinaryExpressionWithTypeRHS) {
parent = parent.getParent();
}
else if (parent instanceof KtValueArgument || parent instanceof KtValueArgumentList) {
parent = parent.getParent();
}
else if (parent instanceof KtLambdaExpression || parent instanceof KtAnnotatedExpression) {
parent = parent.getParent();
}
else {
return null;
}
}
return null;
}
public static boolean isLabeledFunctionLiteral(@NotNull KtFunctionLiteral functionLiteral) {
// KtFunctionLiteral -> KtLambdaExpression -> KtLabeledExpression
return functionLiteral.getParent().getParent() instanceof KtLabeledExpression;
}
@Nullable
public static KtExpression getLastElementDeparenthesized(
@Nullable KtExpression expression,
@NotNull StatementFilter statementFilter
) {
KtExpression deparenthesizedExpression = deparenthesize(expression);
if (deparenthesizedExpression instanceof KtBlockExpression) {
KtBlockExpression blockExpression = (KtBlockExpression) deparenthesizedExpression;
// todo
// This case is a temporary hack for 'if' branches.
// The right way to implement this logic is to interpret 'if' branches as function literals with explicitly-typed signatures
// (no arguments and no receiver) and therefore analyze them straight away (not in the 'complete' phase).
KtExpression lastStatementInABlock = StatementFilterKt.getLastStatementInABlock(statementFilter, blockExpression);
if (lastStatementInABlock != null) {
return getLastElementDeparenthesized(lastStatementInABlock, statementFilter);
}
}
return deparenthesizedExpression;
}
public static boolean isStatementContainer(@Nullable PsiElement container) {
return container instanceof KtBlockExpression ||
container instanceof KtContainerNodeForControlStructureBody ||
container instanceof KtWhenEntry;
}
public static boolean isStatement(@NotNull PsiElement element) {
return isStatementContainer(element.getParent());
}
public static boolean isInOrNotInOperation(@NotNull KtBinaryExpression binaryExpression) {
return isInOperation(binaryExpression) || isNotInOperation(binaryExpression);
}
public static boolean isNotInOperation(@NotNull KtBinaryExpression binaryExpression) {
return (binaryExpression.getOperationToken() == KtTokens.NOT_IN);
}
private static boolean isInOperation(@NotNull KtBinaryExpression binaryExpression) {
return (binaryExpression.getOperationToken() == KtTokens.IN_KEYWORD);
}
}
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