| /* |
| * 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 com.siyeh.ig.performance; |
| |
| import com.intellij.codeInspection.ui.SingleCheckboxOptionsPanel; |
| import com.intellij.openapi.util.WriteExternalException; |
| import com.intellij.psi.*; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import org.jdom.Element; |
| import org.jetbrains.annotations.Nls; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import javax.swing.*; |
| import java.util.Collection; |
| import java.util.HashSet; |
| |
| public class DynamicRegexReplaceableByCompiledPatternInspectionBase extends BaseInspection { |
| |
| @SuppressWarnings("UnusedDeclaration") |
| public boolean ignoreForSplitOptimization = true; |
| |
| @NonNls |
| protected static final Collection<String> regexMethodNames = new HashSet<String>(4); |
| static { |
| regexMethodNames.add("matches"); |
| regexMethodNames.add("replaceFirst"); |
| regexMethodNames.add("replaceAll"); |
| regexMethodNames.add("split"); |
| } |
| |
| @Override |
| @Nls |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message( |
| "dynamic.regex.replaceable.by.compiled.pattern.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| protected String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message( |
| "dynamic.regex.replaceable.by.compiled.pattern.problem.descriptor"); |
| } |
| |
| @Nullable |
| @Override |
| public JComponent createOptionsPanel() { |
| return new SingleCheckboxOptionsPanel("Ignore for String.split() optimizations (since Java 7)", this, "ignoreForSplitOptimization"); |
| } |
| |
| @Override |
| public void writeSettings(@NotNull Element node) throws WriteExternalException { |
| if (!ignoreForSplitOptimization) { |
| node.addContent(new Element("option").setAttribute("name", "ignoreForSplitOptimization").setAttribute("value", "false")); |
| } |
| } |
| |
| @Override |
| protected boolean buildQuickFixesOnlyForOnTheFlyErrors() { |
| return true; |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new DynamicRegexReplaceableByCompiledPatternVisitor(); |
| } |
| |
| private class DynamicRegexReplaceableByCompiledPatternVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitMethodCallExpression(PsiMethodCallExpression expression) { |
| super.visitMethodCallExpression(expression); |
| if (!isCallToRegexMethod(expression)) { |
| return; |
| } |
| registerMethodCallError(expression); |
| } |
| |
| private boolean isCallToRegexMethod(PsiMethodCallExpression expression) { |
| final PsiReferenceExpression methodExpression = expression.getMethodExpression(); |
| final String name = methodExpression.getReferenceName(); |
| if (!regexMethodNames.contains(name)) { |
| return false; |
| } |
| final PsiExpressionList argumentList = expression.getArgumentList(); |
| final PsiExpression[] arguments = argumentList.getExpressions(); |
| if (arguments.length == 0) { |
| return false; |
| } |
| final Object value = ExpressionUtils.computeConstantExpression(arguments[0]); |
| if (!(value instanceof String)) { |
| return false; |
| } |
| final String regex = (String)value; |
| if (ignoreForSplitOptimization && "split".equals(name) && isOptimizedPattern(regex)) { |
| return false; |
| } |
| final PsiMethod method = expression.resolveMethod(); |
| if (method == null) { |
| return false; |
| } |
| final PsiClass containingClass = method.getContainingClass(); |
| if (containingClass == null) { |
| return false; |
| } |
| final String className = containingClass.getQualifiedName(); |
| return CommonClassNames.JAVA_LANG_STRING.equals(className); |
| } |
| |
| private boolean isOptimizedPattern(String regex) { |
| // from String.split() |
| int ch; |
| return ((regex.length() == 1 && |
| ".$|()[{^?*+\\".indexOf(ch = regex.charAt(0)) == -1) || |
| (regex.length() == 2 && |
| regex.charAt(0) == '\\' && |
| (((ch = regex.charAt(1))-'0')|('9'-ch)) < 0 && |
| ((ch-'a')|('z'-ch)) < 0 && |
| ((ch-'A')|('Z'-ch)) < 0)) && |
| (ch < Character.MIN_HIGH_SURROGATE || |
| ch > Character.MAX_LOW_SURROGATE); |
| } |
| } |
| } |