package com.jetbrains.lang.dart.util;
import com.intellij.codeInsight.PsiEquivalenceUtil;
import com.intellij.lang.ASTNode;
import com.intellij.navigation.NavigationItem;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiWhiteSpace;
import com.intellij.psi.ResolveState;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.containers.ContainerUtil;
import com.jetbrains.lang.dart.DartComponentType;
import com.jetbrains.lang.dart.DartTokenTypes;
import com.jetbrains.lang.dart.psi.*;
import com.jetbrains.lang.dart.resolve.ComponentNameScopeProcessor;
import gnu.trove.THashSet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
public class DartRefactoringUtil {
public static Set<String> collectUsedNames(PsiElement context) {
return new THashSet<>(ContainerUtil.map(collectUsedComponents(context), NavigationItem::getName));
}
public static Set<DartComponentName> collectUsedComponents(PsiElement context) {
final Set<DartComponentName> usedComponentNames = new THashSet<>();
PsiTreeUtil.treeWalkUp(new ComponentNameScopeProcessor(usedComponentNames), context, null, ResolveState.initial());
return usedComponentNames;
}
@Nullable
public static DartExpression getSelectedExpression(@NotNull final Project project,
@NotNull PsiFile file,
@NotNull final PsiElement element1,
@NotNull final PsiElement element2) {
PsiElement parent = PsiTreeUtil.findCommonParent(element1, element2);
if (parent == null) {
return null;
}
if (parent instanceof DartExpression) {
return (DartExpression)parent;
}
return PsiTreeUtil.getParentOfType(parent, DartExpression.class);
}
@NotNull
public static List<PsiElement> getOccurrences(@NotNull final PsiElement pattern, @Nullable final PsiElement context) {
if (context == null) {
return Collections.emptyList();
}
final List<PsiElement> occurrences = new ArrayList<>();
context.acceptChildren(new DartRecursiveVisitor() {
@Override
public void visitElement(@NotNull final PsiElement element) {
if (DartComponentType.typeOf(element) == DartComponentType.PARAMETER) {
return;
}
if (PsiEquivalenceUtil.areElementsEquivalent(element, pattern)) {
occurrences.add(element);
return;
}
super.visitElement(element);
}
});
return occurrences;
}
@NotNull
public static PsiElement[] findStatementsInRange(PsiFile file, int startOffset, int endOffset) {
PsiElement element1 = file.findElementAt(startOffset);
PsiElement element2 = file.findElementAt(endOffset - 1);
if (element1 instanceof PsiWhiteSpace) {
startOffset = element1.getTextRange().getEndOffset();
element1 = file.findElementAt(startOffset);
}
if (element2 instanceof PsiWhiteSpace) {
endOffset = element2.getTextRange().getStartOffset();
element2 = file.findElementAt(endOffset - 1);
}
if (element1 != null && element2 != null) {
PsiElement commonParent = PsiTreeUtil.findCommonParent(element1, element2);
if (commonParent instanceof DartExpression) {
return new PsiElement[]{commonParent};
}
}
final DartStatements statements = PsiTreeUtil.getParentOfType(element1, DartStatements.class);
if (statements == null || element2 == null || !PsiTreeUtil.isAncestor(statements, element2, true)) {
return PsiElement.EMPTY_ARRAY;
}
// don't forget about leafs (ex. ';')
final ASTNode[] astResult = UsefulPsiTreeUtil.findChildrenRange(statements.getNode().getChildren(null), startOffset, endOffset);
return ContainerUtil.map2Array(astResult, PsiElement.class, ASTNode::getPsi);
}
@Nullable
public static DartExpression findExpressionInRange(PsiFile file, int startOffset, int endOffset) {
PsiElement element1 = file.findElementAt(startOffset);
PsiElement element2 = file.findElementAt(endOffset - 1);
if (element1 instanceof PsiWhiteSpace) {
startOffset = element1.getTextRange().getEndOffset();
}
if (element2 instanceof PsiWhiteSpace) {
endOffset = element2.getTextRange().getStartOffset();
}
DartExpression expression = PsiTreeUtil.findElementOfClassAtRange(file, startOffset, endOffset, DartExpression.class);
if (expression == null || expression.getTextRange().getEndOffset() != endOffset) return null;
if (expression instanceof DartReference && expression.getParent() instanceof DartCallExpression) return null;
return expression;
}
@NotNull
public static PsiElement[] findListExpressionInRange(@NotNull PsiFile file, int startOffset, int endOffset) {
// startOffset and endOffset are at the beginning of lines
// return an expression that spans those lines, plus optional comma if any
PsiElement element1 = file.findElementAt(startOffset);
PsiElement element2 = file.findElementAt(endOffset - 1);
if (element1 instanceof PsiWhiteSpace) {
startOffset = element1.getTextRange().getEndOffset();
}
if (element2 instanceof PsiWhiteSpace) {
endOffset = element2.getTextRange().getStartOffset();
}
DartExpression expression = PsiTreeUtil.findElementOfClassAtRange(file, startOffset, endOffset, DartExpression.class);
if (expression == null) {
return PsiElement.EMPTY_ARRAY;
}
if (expression.getTextRange().getEndOffset() != endOffset) {
element2 = file.findElementAt(endOffset - 1);
if (element2 != null && isComma(element2)) {
PsiElement prev = UsefulPsiTreeUtil.getPrevSiblingSkipWhiteSpacesAndComments(element2, true);
if (prev instanceof DartExpressionList) {
prev = prev.getLastChild();
}
else if (prev instanceof DartNamedArgument && prev == expression.getParent()) {
return new PsiElement[]{prev, element2};
}
if (prev == expression) {
return new PsiElement[]{expression, element2};
}
else {
return PsiElement.EMPTY_ARRAY;
}
}
else {
return PsiElement.EMPTY_ARRAY;
}
}
return new PsiElement[]{expression};
}
public static boolean isRightBracket(@NotNull PsiElement element) {
return element.getNode().getElementType() == DartTokenTypes.RBRACKET;
}
public static boolean isRightParen(@NotNull PsiElement element) {
return element.getNode().getElementType() == DartTokenTypes.RPAREN;
}
public static boolean isComma(@NotNull PsiElement element) {
return element.getNode().getElementType() == DartTokenTypes.COMMA;
}
}