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PsiNavigationDemoAction.java
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PsiNavigationDemoAction.java
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// Copyright 2000-2023 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package org.intellij.sdk.psi;
import com.intellij.openapi.actionSystem.ActionUpdateThread;
import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.ui.Messages;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTreeUtil;
import org.jetbrains.annotations.NotNull;
public class PsiNavigationDemoAction extends AnAction {
@Override
public @NotNull ActionUpdateThread getActionUpdateThread() {
return ActionUpdateThread.BGT;
}
@Override
public void actionPerformed(AnActionEvent anActionEvent) {
Editor editor = anActionEvent.getData(CommonDataKeys.EDITOR);
PsiFile psiFile = anActionEvent.getData(CommonDataKeys.PSI_FILE);
if (editor == null || psiFile == null) {
return;
}
int offset = editor.getCaretModel().getOffset();
final StringBuilder infoBuilder = new StringBuilder();
PsiElement element = psiFile.findElementAt(offset);
infoBuilder.append("Element at caret: ").append(element).append("\n");
if (element != null) {
PsiMethod containingMethod = PsiTreeUtil.getParentOfType(element, PsiMethod.class);
infoBuilder
.append("Containing method: ")
.append(containingMethod != null ? containingMethod.getName() : "none")
.append("\n");
if (containingMethod != null) {
PsiClass containingClass = containingMethod.getContainingClass();
infoBuilder
.append("Containing class: ")
.append(containingClass != null ? containingClass.getName() : "none")
.append("\n");
infoBuilder.append("Local variables:\n");
containingMethod.accept(new JavaRecursiveElementVisitor() {
@Override
public void visitLocalVariable(@NotNull PsiLocalVariable variable) {
super.visitLocalVariable(variable);
infoBuilder.append(variable.getName()).append("\n");
}
});
}
}
Messages.showMessageDialog(anActionEvent.getProject(), infoBuilder.toString(), "PSI Info", null);
}
@Override
public void update(AnActionEvent e) {
Editor editor = e.getData(CommonDataKeys.EDITOR);
PsiFile psiFile = e.getData(CommonDataKeys.PSI_FILE);
e.getPresentation().setEnabled(editor != null && psiFile != null);
}
}