| /* |
| * 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; |
| } |
| } |