org.teavm.codegen.MinifyingAliasProvider Maven / Gradle / Ivy
/*
* Copyright 2013 Alexey Andreev.
*
* 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.teavm.codegen;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import org.teavm.model.FieldReference;
import org.teavm.model.MethodDescriptor;
import org.teavm.model.MethodReference;
/**
*
* @author Alexey Andreev
*/
public class MinifyingAliasProvider implements AliasProvider {
private static Set keywords = new HashSet<>(Arrays.asList("do", "if", "else", "for", "case",
"goto", "in", "let", "new", "this", "try", "var", "void", "with"));
private static String startLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static String letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
private static String startVirtualLetters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
private int lastSuffix;
private int lastVirtual;
private Set usedAliases = new HashSet<>();
@Override
public String getAlias(FieldReference field) {
String result;
do {
result = getNewAlias(lastVirtual++, startVirtualLetters);
} while (!usedAliases.add(result) || keywords.contains(result));
return result;
}
@Override
public String getAlias(MethodReference method) {
return getNewAlias(lastSuffix++, startLetters);
}
@Override
public String getAlias(MethodDescriptor method) {
String result;
do {
result = getNewAlias(lastVirtual++, startVirtualLetters);
} while (!usedAliases.add(result) || keywords.contains(result));
return result;
}
@Override
public String getAlias(String className) {
return getNewAlias(lastSuffix++, startLetters);
}
@Override
public String getFunctionAlias(String className) {
return getNewAlias(lastSuffix++, startLetters);
}
private String getNewAlias(int index, String startLetters) {
StringBuilder sb = new StringBuilder();
sb.append(startLetters.charAt(index % startLetters.length()));
index /= startLetters.length();
while (index > 0) {
sb.append(letters.charAt(index % letters.length()));
index /= letters.length();
}
return sb.toString();
}
}
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