| /* |
| * Copyright 2000-2014 JetBrains s.r.o. |
| * |
| * 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 org.jetbrains.plugins.groovy.codeInspection.confusing; |
| |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.tree.IElementType; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.plugins.groovy.codeInspection.BaseInspection; |
| import org.jetbrains.plugins.groovy.codeInspection.BaseInspectionVisitor; |
| import org.jetbrains.plugins.groovy.lang.lexer.GroovyTokenTypes; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrBinaryExpression; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrParenthesizedExpression; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrUnaryExpression; |
| |
| public class GroovyOverlyComplexBooleanExpressionInspectionBase extends BaseInspection { |
| private static final int TERM_LIMIT = 3; |
| /** |
| * @noinspection PublicField,WeakerAccess |
| */ |
| public int m_limit = TERM_LIMIT; |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return "Overly complex boolean expression"; |
| } |
| |
| @Override |
| @NotNull |
| public String getGroupDisplayName() { |
| return CONFUSING_CODE_CONSTRUCTS; |
| } |
| |
| private int getLimit() { |
| return m_limit; |
| } |
| |
| @Override |
| protected String buildErrorString(Object... args) { |
| return "Overly complex boolean expression #loc"; |
| } |
| |
| @NotNull |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new Visitor(); |
| } |
| |
| private class Visitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitBinaryExpression(@NotNull GrBinaryExpression expression) { |
| super.visitBinaryExpression(expression); |
| checkExpression(expression); |
| } |
| |
| @Override |
| public void visitUnaryExpression(@NotNull GrUnaryExpression expression) { |
| super.visitUnaryExpression(expression); |
| checkExpression(expression); |
| } |
| |
| @Override |
| public void visitParenthesizedExpression(GrParenthesizedExpression expression) { |
| super.visitParenthesizedExpression(expression); |
| checkExpression(expression); |
| } |
| |
| private void checkExpression(GrExpression expression) { |
| if (!isBoolean(expression)) { |
| return; |
| } |
| if (isParentBoolean(expression)) { |
| return; |
| } |
| final int numTerms = countTerms(expression); |
| if (numTerms <= getLimit()) { |
| return; |
| } |
| registerError(expression); |
| } |
| |
| private int countTerms(GrExpression expression) { |
| if (expression == null) { |
| return 0; |
| } |
| if (!isBoolean(expression)) { |
| return 1; |
| } |
| if (expression instanceof GrBinaryExpression) { |
| final GrBinaryExpression binaryExpression = (GrBinaryExpression) expression; |
| final GrExpression lhs = binaryExpression.getLeftOperand(); |
| final GrExpression rhs = binaryExpression.getRightOperand(); |
| return countTerms(lhs) + countTerms(rhs); |
| } else if (expression instanceof GrUnaryExpression) { |
| final GrUnaryExpression prefixExpression = (GrUnaryExpression) expression; |
| final GrExpression operand = prefixExpression.getOperand(); |
| return countTerms(operand); |
| } else if (expression instanceof GrParenthesizedExpression) { |
| final GrParenthesizedExpression parenthesizedExpression = (GrParenthesizedExpression) expression; |
| final GrExpression contents = parenthesizedExpression.getOperand(); |
| return countTerms(contents); |
| } |
| return 1; |
| } |
| |
| private boolean isParentBoolean(GrExpression expression) { |
| final PsiElement parent = expression.getParent(); |
| if (!(parent instanceof GrExpression)) { |
| return false; |
| } |
| return isBoolean((GrExpression) parent); |
| } |
| |
| private boolean isBoolean(GrExpression expression) { |
| if (expression instanceof GrBinaryExpression) { |
| final GrBinaryExpression binaryExpression = (GrBinaryExpression) expression; |
| final IElementType sign = binaryExpression.getOperationTokenType(); |
| return GroovyTokenTypes.mLAND.equals(sign) || |
| GroovyTokenTypes.mLOR.equals(sign); |
| } else if (expression instanceof GrUnaryExpression) { |
| final GrUnaryExpression prefixExpression = (GrUnaryExpression) expression; |
| final IElementType sign = prefixExpression.getOperationTokenType(); |
| return GroovyTokenTypes.mLNOT.equals(sign); |
| } else if (expression instanceof GrParenthesizedExpression) { |
| final GrParenthesizedExpression parenthesizedExpression = (GrParenthesizedExpression) expression; |
| final GrExpression contents = parenthesizedExpression.getOperand(); |
| return isBoolean(contents); |
| } |
| return false; |
| } |
| } |
| } |