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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.debugger.impl;
import com.intellij.debugger.SourcePosition;
import com.intellij.debugger.engine.ContextUtil;
import com.intellij.debugger.engine.StackFrameContext;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Computable;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.text.CharArrayUtil;
import org.jetbrains.annotations.Nullable;
/**
* User: lex
* Date: Oct 29, 2003
* Time: 9:29:36 PM
*/
public class PositionUtil extends ContextUtil {
public static SourcePosition getSourcePosition(final StackFrameContext context) {
if(context instanceof DebuggerContextImpl) return ((DebuggerContextImpl)context).getSourcePosition();
return ContextUtil.getSourcePosition(context);
}
@Nullable
public static PsiElement getContextElement(final StackFrameContext context) {
if(context instanceof DebuggerContextImpl) return ((DebuggerContextImpl) context).getContextElement();
return ContextUtil.getContextElement(context);
}
@Nullable
public static <T extends PsiElement> T getPsiElementAt(final Project project, final Class<T> expectedPsiElementClass, final SourcePosition sourcePosition) {
return ApplicationManager.getApplication().runReadAction(new Computable<T>() {
public T compute() {
final PsiFile psiFile = sourcePosition.getFile();
final Document document = PsiDocumentManager.getInstance(project).getDocument(psiFile);
if(document == null) {
return null;
}
final int spOffset = sourcePosition.getOffset();
if (spOffset < 0) {
return null;
}
final int offset = CharArrayUtil.shiftForward(document.getCharsSequence(), spOffset, " \t");
return PsiTreeUtil.getParentOfType(psiFile.findElementAt(offset), expectedPsiElementClass, false);
}
});
}
}
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