| /* |
| * Copyright 2007-2008 Dave Griffith |
| * |
| * 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 org.jetbrains.annotations.NotNull; |
| import org.jetbrains.plugins.groovy.codeInspection.BaseInspection; |
| import org.jetbrains.plugins.groovy.codeInspection.BaseInspectionVisitor; |
| import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElement; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.*; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.blocks.GrOpenBlock; |
| import org.jetbrains.plugins.groovy.lang.psi.util.PsiUtil; |
| |
| public class GroovyEmptyStatementBodyInspection extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return "Statement with empty body"; |
| } |
| |
| @Override |
| @NotNull |
| public String getGroupDisplayName() { |
| return CONFUSING_CODE_CONSTRUCTS; |
| } |
| |
| @Override |
| public boolean isEnabledByDefault() { |
| return true; |
| } |
| |
| @Override |
| public String buildErrorString(Object... args) { |
| if (args[0] instanceof GrIfStatement) { |
| return "'#ref' statement has empty branch"; |
| } |
| else { |
| return "'#ref' statement has empty body"; |
| } |
| } |
| |
| @NotNull |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new Visitor(); |
| } |
| |
| private static class Visitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitWhileStatement(@NotNull GrWhileStatement statement) { |
| super.visitWhileStatement(statement); |
| final GrStatement body = statement.getBody(); |
| if (body == null) { |
| return; |
| } |
| if (!isEmpty(body)) { |
| return; |
| } |
| registerStatementError(statement, statement); |
| } |
| |
| @Override |
| public void visitForStatement(@NotNull GrForStatement statement) { |
| super.visitForStatement(statement); |
| final GrStatement body = statement.getBody(); |
| if (body == null) { |
| return; |
| } |
| if (!isEmpty(body)) { |
| return; |
| } |
| registerStatementError(statement, statement); |
| } |
| |
| |
| @Override |
| public void visitIfStatement(@NotNull GrIfStatement statement) { |
| super.visitIfStatement(statement); |
| final GrStatement thenBranch = statement.getThenBranch(); |
| if (thenBranch != null) { |
| if (isEmpty(thenBranch)) { |
| registerStatementError(statement, statement); |
| return; |
| } |
| } |
| final GrStatement elseBranch = statement.getElseBranch(); |
| |
| if (elseBranch != null) { |
| if (isEmpty(elseBranch)) { |
| registerStatementError(statement, statement); |
| } |
| } |
| } |
| |
| private static boolean isEmpty(GroovyPsiElement body) { |
| if (!(body instanceof GrBlockStatement)) { |
| return false; |
| } |
| final GrBlockStatement block = (GrBlockStatement)body; |
| final GrOpenBlock openBlock = block.getBlock(); |
| |
| final PsiElement brace = openBlock.getLBrace(); |
| if (brace == null) return false; |
| final PsiElement nextNonWhitespace = PsiUtil.skipWhitespaces(brace.getNextSibling(), true); |
| return nextNonWhitespace == openBlock.getRBrace(); |
| } |
| } |
| } |