| /* |
| * Copyright 2003-2011 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.performance; |
| |
| import com.intellij.codeInspection.ProblemDescriptor; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.openapi.util.text.StringUtil; |
| import com.intellij.psi.*; |
| import com.intellij.util.IncorrectOperationException; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.InspectionGadgetsFix; |
| import com.siyeh.ig.PsiReplacementUtil; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import com.siyeh.ig.psiutils.TypeUtils; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class LengthOneStringsInConcatenationInspection |
| extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message( |
| "length.one.strings.in.concatenation.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String getID() { |
| return "SingleCharacterStringConcatenation"; |
| } |
| |
| @Override |
| @NotNull |
| public String buildErrorString(Object... infos) { |
| final String string = (String)infos[0]; |
| final String escapedString = StringUtil.escapeStringCharacters(string); |
| return InspectionGadgetsBundle.message( |
| "expression.can.be.replaced.problem.descriptor", |
| escapedString); |
| } |
| |
| @Override |
| public InspectionGadgetsFix buildFix(Object... infos) { |
| return new ReplaceStringsWithCharsFix(); |
| } |
| |
| private static class ReplaceStringsWithCharsFix |
| extends InspectionGadgetsFix { |
| |
| @Override |
| @NotNull |
| public String getName() { |
| return InspectionGadgetsBundle.message( |
| "length.one.strings.in.concatenation.replace.quickfix"); |
| } |
| |
| @NotNull |
| @Override |
| public String getFamilyName() { |
| return getName(); |
| } |
| |
| @Override |
| public void doFix(Project project, ProblemDescriptor descriptor) |
| throws IncorrectOperationException { |
| final PsiExpression expression = |
| (PsiExpression)descriptor.getPsiElement(); |
| final String text = expression.getText(); |
| final int length = text.length(); |
| final String character = text.substring(1, length - 1); |
| final String charLiteral; |
| if ("\'".equals(character)) { |
| charLiteral = "'\\''"; |
| } |
| else if ("\\\"".equals(character)) { |
| charLiteral = "'\"'"; |
| } |
| else { |
| charLiteral = '\'' + character + '\''; |
| } |
| PsiReplacementUtil.replaceExpression(expression, charLiteral); |
| } |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new LengthOneStringsInConcatenationVisitor(); |
| } |
| |
| private static class LengthOneStringsInConcatenationVisitor |
| extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitLiteralExpression( |
| @NotNull PsiLiteralExpression expression) { |
| super.visitLiteralExpression(expression); |
| final PsiType type = expression.getType(); |
| if (!TypeUtils.isJavaLangString(type)) { |
| return; |
| } |
| final String value = (String)expression.getValue(); |
| if (value == null || value.length() != 1) { |
| return; |
| } |
| if (!ExpressionUtils.isStringConcatenationOperand(expression) && |
| !isArgumentOfStringAppend(expression)) { |
| return; |
| } |
| registerError(expression, value); |
| } |
| |
| static boolean isArgumentOfStringAppend(PsiExpression expression) { |
| final PsiElement parent = expression.getParent(); |
| if (parent == null) { |
| return false; |
| } |
| if (!(parent instanceof PsiExpressionList)) { |
| return false; |
| } |
| final PsiElement grandparent = parent.getParent(); |
| if (!(grandparent instanceof PsiMethodCallExpression)) { |
| return false; |
| } |
| final PsiMethodCallExpression call = |
| (PsiMethodCallExpression)grandparent; |
| final PsiReferenceExpression methodExpression = |
| call.getMethodExpression(); |
| @NonNls final String name = methodExpression.getReferenceName(); |
| if (!"append".equals(name) && !"insert".equals(name)) { |
| return false; |
| } |
| final PsiMethod method = call.resolveMethod(); |
| if (method == null) { |
| return false; |
| } |
| final PsiClass methodClass = method.getContainingClass(); |
| if (methodClass == null) { |
| return false; |
| } |
| final String className = methodClass.getQualifiedName(); |
| return CommonClassNames.JAVA_LANG_STRING_BUFFER.equals(className) || |
| CommonClassNames.JAVA_LANG_STRING_BUILDER.equals(className); |
| } |
| } |
| } |