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/*
* Copyright 2003-2012 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.psiutils;
import com.intellij.psi.*;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.Nullable;
public class BoolUtils {
private BoolUtils() {}
public static boolean isNegated(PsiExpression exp) {
PsiExpression ancestor = exp;
PsiElement parent = ancestor.getParent();
while (parent instanceof PsiParenthesizedExpression) {
ancestor = (PsiExpression)parent;
parent = ancestor.getParent();
}
if (parent instanceof PsiPrefixExpression) {
final PsiPrefixExpression prefixAncestor = (PsiPrefixExpression)parent;
final IElementType tokenType = prefixAncestor.getOperationTokenType();
if (tokenType.equals(JavaTokenType.EXCL)) {
return true;
}
}
return false;
}
@Nullable
public static PsiExpression findNegation(PsiExpression expression) {
PsiExpression ancestor = expression;
PsiElement parent = ancestor.getParent();
while (parent instanceof PsiParenthesizedExpression) {
ancestor = (PsiExpression)parent;
parent = ancestor.getParent();
}
if (parent instanceof PsiPrefixExpression) {
final PsiPrefixExpression prefixAncestor = (PsiPrefixExpression)parent;
if (JavaTokenType.EXCL.equals(prefixAncestor.getOperationTokenType())) {
return prefixAncestor;
}
}
return null;
}
public static boolean isNegation(PsiExpression exp) {
if (!(exp instanceof PsiPrefixExpression)) {
return false;
}
final PsiPrefixExpression prefixExp = (PsiPrefixExpression)exp;
final IElementType tokenType = prefixExp.getOperationTokenType();
return tokenType.equals(JavaTokenType.EXCL);
}
@Nullable
public static PsiExpression getNegated(PsiExpression expression) {
if (!(expression instanceof PsiPrefixExpression)) {
return null;
}
final PsiPrefixExpression prefixExpression = (PsiPrefixExpression)expression;
final IElementType tokenType = prefixExpression.getOperationTokenType();
if (!JavaTokenType.EXCL.equals(tokenType)) {
return null;
}
final PsiExpression operand = prefixExpression.getOperand();
return ParenthesesUtils.stripParentheses(operand);
}
public static boolean isBooleanLiteral(PsiExpression expression) {
if (!(expression instanceof PsiLiteralExpression)) {
return false;
}
final PsiLiteralExpression literalExpression = (PsiLiteralExpression)expression;
@NonNls final String text = literalExpression.getText();
return PsiKeyword.TRUE.equals(text) || PsiKeyword.FALSE.equals(text);
}
public static String getNegatedExpressionText(@Nullable PsiExpression condition) {
if (condition == null) {
return "";
}
if (condition instanceof PsiParenthesizedExpression) {
final PsiParenthesizedExpression parenthesizedExpression = (PsiParenthesizedExpression)condition;
final PsiExpression expression = parenthesizedExpression.getExpression();
return '(' + getNegatedExpressionText(expression) + ')';
}
else if (isNegation(condition)) {
final PsiExpression negated = getNegated(condition);
if (negated == null) {
return "";
}
return negated.getText();
}
else if (ComparisonUtils.isComparison(condition)) {
final PsiBinaryExpression binaryExpression = (PsiBinaryExpression)condition;
final String negatedComparison = ComparisonUtils.getNegatedComparison(binaryExpression.getOperationTokenType());
final PsiExpression lhs = binaryExpression.getLOperand();
final PsiExpression rhs = binaryExpression.getROperand();
if (rhs == null) {
return lhs.getText() + negatedComparison;
}
return lhs.getText() + negatedComparison + rhs.getText();
}
else if (ParenthesesUtils.getPrecedence(condition) > ParenthesesUtils.PREFIX_PRECEDENCE) {
return "!(" + condition.getText() + ')';
}
else {
return '!' + condition.getText();
}
}
}
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