| /* |
| * 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.PsiType; |
| 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; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import static com.intellij.psi.CommonClassNames.JAVA_LANG_STRING; |
| |
| public class GroovyOverlyComplexArithmeticExpressionInspectionBase 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 arithmetic 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 arithmetic expression #loc"; |
| } |
| |
| @NotNull |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new Visitor(); |
| } |
| |
| private class Visitor extends BaseInspectionVisitor { |
| private final Set<IElementType> arithmeticTokens = new HashSet<IElementType>(5); |
| |
| { |
| arithmeticTokens.add(GroovyTokenTypes.mPLUS); |
| arithmeticTokens.add(GroovyTokenTypes.mMINUS); |
| arithmeticTokens.add(GroovyTokenTypes.mSTAR); |
| arithmeticTokens.add(GroovyTokenTypes.mDIV); |
| arithmeticTokens.add(GroovyTokenTypes.mMOD); |
| } |
| |
| @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 (isParentArithmetic(expression)) { |
| return; |
| } |
| if (!isArithmetic(expression)) { |
| return; |
| } |
| if (containsStringConcatenation(expression)) { |
| return; |
| } |
| final int numTerms = countTerms(expression); |
| if (numTerms <= getLimit()) { |
| return; |
| } |
| registerError(expression); |
| } |
| |
| private int countTerms(GrExpression expression) { |
| if (expression == null) { |
| return 0; |
| } |
| if (!isArithmetic(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 unaryExpression = (GrUnaryExpression) expression; |
| final GrExpression operand = unaryExpression.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 isParentArithmetic(GrExpression expression) { |
| final PsiElement parent = expression.getParent(); |
| if (!(parent instanceof GrExpression)) { |
| return false; |
| } |
| return isArithmetic((GrExpression) parent); |
| } |
| |
| private boolean isArithmetic(GrExpression expression) { |
| if (expression instanceof GrBinaryExpression) { |
| |
| final GrBinaryExpression binaryExpression = (GrBinaryExpression) expression; |
| final IElementType sign = binaryExpression.getOperationTokenType(); |
| return arithmeticTokens.contains(sign); |
| } else if (expression instanceof GrUnaryExpression) { |
| final GrUnaryExpression unaryExpression = (GrUnaryExpression) expression; |
| final IElementType sign = unaryExpression.getOperationTokenType(); |
| return arithmeticTokens.contains(sign); |
| } else if (expression instanceof GrParenthesizedExpression) { |
| final GrParenthesizedExpression parenthesizedExpression = (GrParenthesizedExpression) expression; |
| final GrExpression contents = parenthesizedExpression.getOperand(); |
| return isArithmetic(contents); |
| } |
| return false; |
| } |
| |
| private boolean containsStringConcatenation(GrExpression expression) { |
| if (isString(expression)) { |
| return true; |
| } |
| if (expression instanceof GrBinaryExpression) { |
| |
| final GrBinaryExpression binaryExpression = (GrBinaryExpression) expression; |
| final GrExpression lhs = binaryExpression.getLeftOperand(); |
| |
| if (containsStringConcatenation(lhs)) { |
| return true; |
| } |
| final GrExpression rhs = binaryExpression.getRightOperand(); |
| return containsStringConcatenation(rhs); |
| } else if (expression instanceof GrUnaryExpression) { |
| final GrUnaryExpression unaryExpression = (GrUnaryExpression) expression; |
| final GrExpression operand = unaryExpression.getOperand(); |
| return containsStringConcatenation(operand); |
| } else if (expression instanceof GrParenthesizedExpression) { |
| final GrParenthesizedExpression parenthesizedExpression = (GrParenthesizedExpression) expression; |
| final GrExpression contents = parenthesizedExpression.getOperand(); |
| return containsStringConcatenation(contents); |
| } |
| return false; |
| } |
| |
| private boolean isString(GrExpression expression) { |
| if (expression == null) { |
| return false; |
| } |
| final PsiType type = expression.getType(); |
| if (type == null) { |
| return false; |
| } |
| return type.equalsToText(JAVA_LANG_STRING); |
| } |
| } |
| } |