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// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
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package org.jetbrains.java.decompiler.modules.renamer;
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import org.jetbrains.java.decompiler.code.CodeConstants;
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import org.jetbrains.java.decompiler.main.extern.IIdentifierRenamer;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.Locale;
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import java.util.Set;
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public class ConverterHelper implements IIdentifierRenamer {
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private static final Set<String> KEYWORDS = new HashSet<>(Arrays.asList(
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"abstract", "do", "if", "package", "synchronized", "boolean", "double", "implements", "private", "this", "break", "else", "import",
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"protected", "throw", "byte", "extends", "instanceof", "public", "throws", "case", "false", "int", "return", "transient", "catch",
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"final", "interface", "short", "true", "char", "finally", "long", "static", "try", "class", "float", "native", "strictfp", "void",
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"const", "for", "new", "super", "volatile", "continue", "goto", "null", "switch", "while", "default", "assert", "enum"));
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private static final Set<String> RESERVED_WINDOWS_NAMESPACE = new HashSet<>(Arrays.asList(
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"con", "prn", "aux", "nul",
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"com1", "com2", "com3", "com4", "com5", "com6", "com7", "com8", "com9",
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"lpt1", "lpt2", "lpt3", "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9"));
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private int classCounter = 0;
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private int fieldCounter = 0;
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private int methodCounter = 0;
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private final Set<String> setNonStandardClassNames = new HashSet<>();
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@Override
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public boolean toBeRenamed(Type elementType, String className, String element, String descriptor) {
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String value = elementType == Type.ELEMENT_CLASS ? className : element;
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return value == null ||
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value.length() <= 2 ||
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!isValidIdentifier(elementType == Type.ELEMENT_METHOD, value) ||
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KEYWORDS.contains(value) ||
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elementType == Type.ELEMENT_CLASS && (
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RESERVED_WINDOWS_NAMESPACE.contains(value.toLowerCase(Locale.US)) ||
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value.length() > 255 - ".class".length());
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}
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/**
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* Return {@code true} if, and only if identifier passed is compliant to JLS9 section 3.8 AND DOES NOT CONTAINS so-called "ignorable" characters.
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* Ignorable characters are removed by javac silently during compilation and thus may appear only in specially crafted obfuscated classes.
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* For more information about "ignorable" characters see <a href="https://bugs.openjdk.java.net/browse/JDK-7144981">JDK-7144981</a>.
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*
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* @param identifier Identifier to be checked
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* @return {@code true} in case {@code identifier} passed can be used as an identifier; {@code false} otherwise.
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*/
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private static boolean isValidIdentifier(boolean isMethod, String identifier) {
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assert identifier != null : "Null identifier passed to the isValidIdentifier() method.";
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assert !identifier.isEmpty() : "Empty identifier passed to the isValidIdentifier() method.";
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if (isMethod && (identifier.equals(CodeConstants.INIT_NAME) || identifier.equals(CodeConstants.CLINIT_NAME))) {
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return true;
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}
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if (!Character.isJavaIdentifierStart(identifier.charAt(0))) {
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return false;
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}
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char[] chars = identifier.toCharArray();
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for(int i = 1; i < chars.length; i++) {
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char ch = chars[i];
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if ((!Character.isJavaIdentifierPart(ch)) || Character.isIdentifierIgnorable(ch)) {
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return false;
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}
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}
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return true;
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}
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// TODO: consider possible conflicts with not renamed classes, fields and methods!
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// We should get all relevant information here.
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@Override
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public String getNextClassName(String fullName, String shortName) {
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if (shortName == null) {
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return "class_" + (classCounter++);
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}
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int index = 0;
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while (index < shortName.length() && Character.isDigit(shortName.charAt(index))) {
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index++;
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}
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if (index == 0 || index == shortName.length()) {
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return "class_" + (classCounter++);
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}
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else {
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String name = shortName.substring(index);
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if (setNonStandardClassNames.contains(name)) {
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return "Inner" + name + "_" + (classCounter++);
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}
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else {
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setNonStandardClassNames.add(name);
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return "Inner" + name;
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}
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}
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}
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@Override
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public String getNextFieldName(String className, String field, String descriptor) {
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return "field_" + (fieldCounter++);
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}
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@Override
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public String getNextMethodName(String className, String method, String descriptor) {
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return "method_" + (methodCounter++);
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}
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// *****************************************************************************
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// static methods
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// *****************************************************************************
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public static String getSimpleClassName(String fullName) {
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return fullName.substring(fullName.lastIndexOf('/') + 1);
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}
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public static String replaceSimpleClassName(String fullName, String newName) {
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return fullName.substring(0, fullName.lastIndexOf('/') + 1) + newName;
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}
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}
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