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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.codeInsight.editorActions;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.CodeStyleManager;
import com.intellij.psi.search.LocalSearchScope;
import com.intellij.psi.search.searches.ReferencesSearch;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.util.PsiUtil;
import com.intellij.util.IncorrectOperationException;
public class DeclarationJoinLinesHandler implements JoinLinesHandlerDelegate {
private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.editorActions.DeclarationJoinLinesHandler");
@Override
public int tryJoinLines(final Document document, final PsiFile file, final int start, final int end) {
PsiElement elementAtStartLineEnd = file.findElementAt(start);
PsiElement elementAtNextLineStart = file.findElementAt(end);
if (elementAtStartLineEnd == null || elementAtNextLineStart == null) return -1;
// first line.
if (!(elementAtStartLineEnd instanceof PsiJavaToken)) return -1;
PsiJavaToken lastFirstLineToken = (PsiJavaToken)elementAtStartLineEnd;
if (lastFirstLineToken.getTokenType() != JavaTokenType.SEMICOLON) return -1;
if (!(lastFirstLineToken.getParent() instanceof PsiLocalVariable)) return -1;
PsiLocalVariable var = (PsiLocalVariable)lastFirstLineToken.getParent();
if (!(var.getParent() instanceof PsiDeclarationStatement)) return -1;
PsiDeclarationStatement decl = (PsiDeclarationStatement)var.getParent();
if (decl.getDeclaredElements().length > 1) return -1;
//second line.
if (!(elementAtNextLineStart instanceof PsiJavaToken)) return -1;
PsiJavaToken firstNextLineToken = (PsiJavaToken)elementAtNextLineStart;
if (firstNextLineToken.getTokenType() != JavaTokenType.IDENTIFIER) return -1;
if (!(firstNextLineToken.getParent() instanceof PsiReferenceExpression)) return -1;
PsiReferenceExpression ref = (PsiReferenceExpression)firstNextLineToken.getParent();
PsiElement refResolved = ref.resolve();
PsiManager psiManager = ref.getManager();
if (!psiManager.areElementsEquivalent(refResolved, var)) return -1;
if (!(ref.getParent() instanceof PsiAssignmentExpression)) return -1;
PsiAssignmentExpression assignment = (PsiAssignmentExpression)ref.getParent();
if (!(assignment.getParent() instanceof PsiExpressionStatement)) return -1;
if (ReferencesSearch.search(var, new LocalSearchScope(assignment.getRExpression()), false).findFirst() != null) {
return -1;
}
final PsiElementFactory factory = JavaPsiFacade.getInstance(psiManager.getProject()).getElementFactory();
PsiExpression initializerExpression;
final IElementType originalOpSign = assignment.getOperationTokenType();
if (originalOpSign == JavaTokenType.EQ) {
initializerExpression = assignment.getRExpression();
}
else {
if (var.getInitializer() == null) return -1;
String opSign = null;
if (originalOpSign == JavaTokenType.ANDEQ) {
opSign = "&";
}
else if (originalOpSign == JavaTokenType.ASTERISKEQ) {
opSign = "*";
}
else if (originalOpSign == JavaTokenType.DIVEQ) {
opSign = "/";
}
else if (originalOpSign == JavaTokenType.GTGTEQ) {
opSign = ">>";
}
else if (originalOpSign == JavaTokenType.GTGTGTEQ) {
opSign = ">>>";
}
else if (originalOpSign == JavaTokenType.LTLTEQ) {
opSign = "<<";
}
else if (originalOpSign == JavaTokenType.MINUSEQ) {
opSign = "-";
}
else if (originalOpSign == JavaTokenType.OREQ) {
opSign = "|";
}
else if (originalOpSign == JavaTokenType.PERCEQ) {
opSign = "%";
}
else if (originalOpSign == JavaTokenType.PLUSEQ) {
opSign = "+";
}
else if (originalOpSign == JavaTokenType.XOREQ) {
opSign = "^";
}
try {
initializerExpression =
factory.createExpressionFromText(var.getInitializer().getText() + opSign + assignment.getRExpression().getText(), var);
initializerExpression = (PsiExpression)CodeStyleManager.getInstance(psiManager).reformat(initializerExpression);
}
catch (IncorrectOperationException e) {
LOG.error(e);
return -1;
}
}
PsiExpressionStatement statement = (PsiExpressionStatement)assignment.getParent();
int startOffset = decl.getTextRange().getStartOffset();
try {
PsiDeclarationStatement newDecl = factory.createVariableDeclarationStatement(var.getName(), var.getType(), initializerExpression);
PsiVariable newVar = (PsiVariable)newDecl.getDeclaredElements()[0];
if (var.getModifierList().getText().length() > 0) {
PsiUtil.setModifierProperty(newVar, PsiModifier.FINAL, true);
}
newVar.getModifierList().replace(var.getModifierList());
PsiVariable variable = (PsiVariable)newDecl.getDeclaredElements()[0];
final int offsetBeforeEQ = variable.getNameIdentifier().getTextRange().getEndOffset();
final int offsetAfterEQ = variable.getInitializer().getTextRange().getStartOffset() + 1;
newDecl = (PsiDeclarationStatement)CodeStyleManager.getInstance(psiManager).reformatRange(newDecl, offsetBeforeEQ, offsetAfterEQ);
PsiElement child = statement.getLastChild();
while (child instanceof PsiComment || child instanceof PsiWhiteSpace) {
child = child.getPrevSibling();
}
if (child != null && child.getNextSibling() != null) {
newDecl.addRangeBefore(child.getNextSibling(), statement.getLastChild(), null);
}
decl.replace(newDecl);
statement.delete();
return startOffset + newDecl.getTextRange().getEndOffset() - newDecl.getTextRange().getStartOffset();
}
catch (IncorrectOperationException e) {
LOG.error(e);
return -1;
}
}
}
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