| /* |
| * 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.ig.psiutils; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.tree.IElementType; |
| import org.jetbrains.annotations.Contract; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| public class BoolUtils { |
| |
| private BoolUtils() {} |
| |
| public static boolean isNegation(@NotNull PsiExpression expression) { |
| if (!(expression instanceof PsiPrefixExpression)) { |
| return false; |
| } |
| final PsiPrefixExpression prefixExp = (PsiPrefixExpression)expression; |
| final IElementType tokenType = prefixExp.getOperationTokenType(); |
| return JavaTokenType.EXCL.equals(tokenType); |
| } |
| |
| @Nullable |
| private static PsiExpression getNegated(@NotNull PsiExpression expression) { |
| final PsiPrefixExpression prefixExp = (PsiPrefixExpression)expression; |
| final PsiExpression operand = prefixExp.getOperand(); |
| return ParenthesesUtils.stripParentheses(operand); |
| } |
| |
| @NotNull |
| public static String getNegatedExpressionText(@Nullable PsiExpression condition) { |
| if (condition == null) { |
| return ""; |
| } |
| if (condition instanceof PsiParenthesizedExpression) { |
| final PsiParenthesizedExpression parenthesizedExpression = |
| (PsiParenthesizedExpression)condition; |
| final PsiExpression contentExpression = |
| parenthesizedExpression.getExpression(); |
| return '(' + getNegatedExpressionText(contentExpression) + ')'; |
| } |
| else if (isNegation(condition)) { |
| final PsiExpression negated = getNegated(condition); |
| if (negated == null) { |
| return ""; |
| } |
| return negated.getText(); |
| } |
| else if (ComparisonUtils.isComparison(condition)) { |
| final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)condition; |
| final String negatedComparison = ComparisonUtils.getNegatedComparison(polyadicExpression.getOperationTokenType()); |
| final StringBuilder result = new StringBuilder(); |
| final PsiExpression[] operands = polyadicExpression.getOperands(); |
| final boolean isEven = (operands.length & 1) != 1; |
| for (int i = 0, length = operands.length; i < length; i++) { |
| final PsiExpression operand = operands[i]; |
| if (i > 0) { |
| if (isEven && (i & 1) != 1) { |
| final PsiJavaToken token = polyadicExpression.getTokenBeforeOperand(operand); |
| if (token != null) { |
| result.append(token.getText()); |
| } |
| } |
| else { |
| result.append(negatedComparison); |
| } |
| } |
| result.append(operand.getText()); |
| } |
| return result.toString(); |
| } |
| else if (ParenthesesUtils.getPrecedence(condition) > ParenthesesUtils.PREFIX_PRECEDENCE) { |
| return "!(" + condition.getText() + ')'; |
| } |
| else { |
| return '!' + condition.getText(); |
| } |
| } |
| |
| @Contract(value = "null -> false", pure = true) |
| public static boolean isTrue(@Nullable PsiExpression expression) { |
| expression = ParenthesesUtils.stripParentheses(expression); |
| if (expression == null) { |
| return false; |
| } |
| return PsiKeyword.TRUE.equals(expression.getText()); |
| } |
| |
| @Contract(value ="null -> false", pure = true) |
| public static boolean isFalse(@Nullable PsiExpression expression) { |
| expression = ParenthesesUtils.stripParentheses(expression); |
| if (expression == null) { |
| return false; |
| } |
| return PsiKeyword.FALSE.equals(expression.getText()); |
| } |
| } |