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/*
* Copyright 2003-2013 Dave Griffith, 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.constant;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiUtil;
import com.siyeh.ig.psiutils.ExpressionUtils;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.Nullable;
import static com.intellij.psi.CommonClassNames.JAVA_LANG_STRING;
class ConstantSubexpressionPredicate implements PsiElementPredicate {
@Override
public boolean satisfiedBy(PsiElement element) {
final PsiJavaToken token;
if (element instanceof PsiJavaToken) {
token = (PsiJavaToken)element;
}
else {
final PsiElement prevSibling = element.getPrevSibling();
if (prevSibling instanceof PsiJavaToken) {
token = (PsiJavaToken)prevSibling;
}
else {
return false;
}
}
final PsiElement parent = element.getParent();
if (!(parent instanceof PsiPolyadicExpression)) {
return false;
}
final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)parent;
final PsiType type = polyadicExpression.getType();
if (type == null || type.equalsToText(JAVA_LANG_STRING)) {
// handled by JoinConcatenatedStringLiteralsIntention
return false;
}
final PsiPolyadicExpression subexpression = getSubexpression(polyadicExpression, token);
if (subexpression == null) {
return false;
}
if (!isPartOfLargerExpression(polyadicExpression)) {
// handled by ConstantExpressionIntention
return false;
}
if (!PsiUtil.isConstantExpression(subexpression)) {
return false;
}
final Object value = ExpressionUtils.computeConstantExpression(subexpression);
return value != null;
}
@Nullable
static PsiPolyadicExpression getSubexpression(PsiPolyadicExpression expression, PsiJavaToken token) {
final PsiExpression[] operands = expression.getOperands();
if (operands.length == 2) {
return expression;
}
for (int i = 1; i < operands.length; i++) {
final PsiExpression operand = operands[i];
final PsiJavaToken currentToken = expression.getTokenBeforeOperand(operand);
if (currentToken == token) {
final String binaryExpressionText = operands[i - 1].getText() + ' ' + token.getText() + ' ' + operand.getText();
final PsiElementFactory factory = JavaPsiFacade.getElementFactory(expression.getProject());
return (PsiPolyadicExpression)factory.createExpressionFromText(binaryExpressionText, expression);
}
}
return null;
}
private static boolean isPartOfLargerExpression(PsiPolyadicExpression expression) {
if (expression.getOperands().length > 2) {
return true;
}
final PsiElement containingElement = expression.getParent();
if (containingElement instanceof PsiExpression) {
final PsiExpression containingExpression =
(PsiExpression)containingElement;
if (!PsiUtil.isConstantExpression(containingExpression)) {
return false;
}
}
else {
return false;
}
return true;
}
}
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