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/*
* Copyright 2000-2011 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.actions;
import com.intellij.debugger.SourcePosition;
import com.intellij.lang.java.JavaLanguage;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.*;
import com.intellij.util.Range;
import com.intellij.util.containers.OrderedSet;
import com.intellij.util.text.CharArrayUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Collections;
import java.util.List;
import java.util.Stack;
/**
* User: Alexander Podkhalyuzin
* Date: 22.11.11
*/
public class JavaSmartStepIntoHandler extends JvmSmartStepIntoHandler {
@Override
public boolean isAvailable(final SourcePosition position) {
final PsiFile file = position.getFile();
return file.getLanguage().isKindOf(JavaLanguage.INSTANCE);
}
@Override
@NotNull
public List<SmartStepTarget> findSmartStepTargets(final SourcePosition position) {
final int line = position.getLine();
if (line < 0) {
return Collections.emptyList(); // the document has been changed
}
final PsiFile file = position.getFile();
final VirtualFile vFile = file.getVirtualFile();
if (vFile == null) {
// the file is not physical
return Collections.emptyList();
}
final Document doc = FileDocumentManager.getInstance().getDocument(vFile);
if (doc == null) return Collections.emptyList();
if (line >= doc.getLineCount()) {
return Collections.emptyList(); // the document has been changed
}
final int startOffset = doc.getLineStartOffset(line);
final TextRange lineRange = new TextRange(startOffset, doc.getLineEndOffset(line));
final int offset = CharArrayUtil.shiftForward(doc.getCharsSequence(), startOffset, " \t");
PsiElement element = file.findElementAt(offset);
if (element != null && !(element instanceof PsiCompiledElement)) {
do {
final PsiElement parent = element.getParent();
if (parent == null || (parent.getTextOffset() < lineRange.getStartOffset())) {
break;
}
element = parent;
}
while(true);
//noinspection unchecked
final List<SmartStepTarget> targets = new OrderedSet<SmartStepTarget>();
final Range<Integer> lines = new Range<Integer>(doc.getLineNumber(element.getTextOffset()), doc.getLineNumber(element.getTextOffset() + element.getTextLength()));
final PsiElementVisitor methodCollector = new JavaRecursiveElementVisitor() {
final Stack<PsiMethod> myContextStack = new Stack<PsiMethod>();
final Stack<String> myParamNameStack = new Stack<String>();
private int myNextLambdaExpressionOrdinal = 0;
@Nullable
private String getCurrentParamName() {
return myParamNameStack.isEmpty() ? null : myParamNameStack.peek();
}
@Override
public void visitAnonymousClass(PsiAnonymousClass aClass) {
for (PsiMethod psiMethod : aClass.getMethods()) {
targets.add(new MethodSmartStepTarget(psiMethod, getCurrentParamName(), psiMethod.getBody(), true, lines));
}
}
public void visitLambdaExpression(PsiLambdaExpression expression) {
targets.add(new LambdaSmartStepTarget(expression, getCurrentParamName(), expression.getBody(), myNextLambdaExpressionOrdinal++, lines));
}
@Override
public void visitStatement(PsiStatement statement) {
if (lineRange.intersects(statement.getTextRange())) {
super.visitStatement(statement);
}
}
public void visitExpressionList(PsiExpressionList expressionList) {
final PsiMethod psiMethod = myContextStack.isEmpty()? null : myContextStack.peek();
if (psiMethod != null) {
final String methodName = psiMethod.getName();
final PsiExpression[] expressions = expressionList.getExpressions();
final PsiParameter[] parameters = psiMethod.getParameterList().getParameters();
for (int idx = 0; idx < expressions.length; idx++) {
final String paramName = (idx < parameters.length && !parameters[idx].isVarArgs())? parameters[idx].getName() : "arg"+(idx+1);
myParamNameStack.push(methodName + ": " + paramName + ".");
final PsiExpression argExpression = expressions[idx];
try {
argExpression.accept(this);
}
finally {
myParamNameStack.pop();
}
}
}
else {
super.visitExpressionList(expressionList);
}
}
@Override
public void visitCallExpression(final PsiCallExpression expression) {
final PsiMethod psiMethod = expression.resolveMethod();
if (psiMethod != null) {
myContextStack.push(psiMethod);
targets.add(new MethodSmartStepTarget(
psiMethod,
null,
expression instanceof PsiMethodCallExpression?
((PsiMethodCallExpression)expression).getMethodExpression().getReferenceNameElement()
: expression instanceof PsiNewExpression? ((PsiNewExpression)expression).getClassOrAnonymousClassReference() : expression,
false,
lines
));
}
try {
super.visitCallExpression(expression);
}
finally {
if (psiMethod != null) {
myContextStack.pop();
}
}
}
};
element.accept(methodCollector);
for (PsiElement sibling = element.getNextSibling(); sibling != null; sibling = sibling.getNextSibling()) {
if (!lineRange.intersects(sibling.getTextRange())) {
break;
}
sibling.accept(methodCollector);
}
return targets;
}
return Collections.emptyList();
}
}
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