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/*
* Copyright 2007-2013 Bas Leijdekkers
*
* 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.siyeh.ipp.opassign;
import com.intellij.psi.*;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.util.TypeConversionUtil;
import com.siyeh.IntentionPowerPackBundle;
import com.siyeh.ig.PsiReplacementUtil;
import com.siyeh.ig.psiutils.ParenthesesUtils;
import com.siyeh.ipp.base.MutablyNamedIntention;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.NotNull;
import java.util.HashMap;
import java.util.Map;
public class ReplaceOperatorAssignmentWithAssignmentIntention extends MutablyNamedIntention {
private static final Map<IElementType, IElementType> tokenMap = new HashMap<IElementType, IElementType>();
static {
tokenMap.put(JavaTokenType.PLUSEQ, JavaTokenType.PLUS);
tokenMap.put(JavaTokenType.MINUSEQ, JavaTokenType.MINUS);
tokenMap.put(JavaTokenType.ASTERISKEQ, JavaTokenType.ASTERISK);
tokenMap.put(JavaTokenType.DIVEQ, JavaTokenType.DIV);
tokenMap.put(JavaTokenType.ANDEQ, JavaTokenType.AND);
tokenMap.put(JavaTokenType.OREQ, JavaTokenType.OR);
tokenMap.put(JavaTokenType.XOREQ, JavaTokenType.XOR);
tokenMap.put(JavaTokenType.PERCEQ, JavaTokenType.PERC);
tokenMap.put(JavaTokenType.LTLTEQ, JavaTokenType.LTLT);
tokenMap.put(JavaTokenType.GTGTEQ, JavaTokenType.GTGT);
tokenMap.put(JavaTokenType.GTGTGTEQ, JavaTokenType.GTGTGT);
}
@Override
@NotNull
protected PsiElementPredicate getElementPredicate() {
return new OperatorAssignmentPredicate();
}
@Override
protected String getTextForElement(PsiElement element) {
final PsiAssignmentExpression assignmentExpression = (PsiAssignmentExpression)element;
final PsiJavaToken sign = assignmentExpression.getOperationSign();
final String operator = sign.getText();
return IntentionPowerPackBundle.message("replace.operator.assignment.with.assignment.intention.name", operator);
}
@Override
protected void processIntention(@NotNull PsiElement element) {
final PsiAssignmentExpression assignmentExpression = (PsiAssignmentExpression)element;
final PsiJavaToken sign = assignmentExpression.getOperationSign();
final PsiExpression lhs = assignmentExpression.getLExpression();
final PsiExpression rhs = assignmentExpression.getRExpression();
final String operator = sign.getText();
final String newOperator = operator.substring(0, operator.length() - 1);
final String lhsText = lhs.getText();
final String rhsText = (rhs == null) ? "" : rhs.getText();
final boolean parentheses;
if (rhs instanceof PsiPolyadicExpression) {
final PsiPolyadicExpression binaryExpression = (PsiPolyadicExpression)rhs;
final int precedence1 = ParenthesesUtils.getPrecedenceForOperator(binaryExpression.getOperationTokenType());
final IElementType signTokenType = sign.getTokenType();
final IElementType newOperatorToken = tokenMap.get(signTokenType);
final int precedence2 = ParenthesesUtils.getPrecedenceForOperator(newOperatorToken);
parentheses = precedence1 >= precedence2 || !ParenthesesUtils.isCommutativeOperator(newOperatorToken);
}
else {
parentheses = false;
}
final String cast = getCastString(lhs, rhs);
final StringBuilder newExpression = new StringBuilder(lhsText);
newExpression.append('=').append(cast);
if (!cast.isEmpty()) {
newExpression.append('(');
}
newExpression.append(lhsText).append(newOperator);
if (parentheses) {
newExpression.append('(').append(rhsText).append(')');
}
else {
newExpression.append(rhsText);
}
if (!cast.isEmpty()) {
newExpression.append(')');
}
PsiReplacementUtil.replaceExpression(assignmentExpression, newExpression.toString());
}
private static String getCastString(PsiExpression lhs, PsiExpression rhs) {
final PsiType lType = lhs.getType();
final PsiType rType = rhs.getType();
if (lType == null || rType == null ||
TypeConversionUtil.isAssignable(lType, rType) || !TypeConversionUtil.areTypesConvertible(lType, rType)) {
return "";
}
return '(' + lType.getCanonicalText() + ')';
}
}
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