/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.el.parser;
import org.junit.Test;
/*
* The purpose of this class is to generate the ranges used in the JavaCC grammar for EL parsing.
*
* The ranges for Tomcat 11 were generated with Java 17.
*
* The generated ranges are unchanged from Java 17 to 18.
*
* The generated ranges change in Java 19.
*/
public class TesterGenerateIdentifierRanges {
/*
* Java Letter is all characters where Character.isJavaIdentifierStart() returns true.
*/
@Test
public void testGenerateJavaLetterRanges() {
int start = 0;
int end = 0;
boolean inRange = false;
for (int i = 0 ; i < 0xFFFF; i++) {
if (Character.isJavaIdentifierStart(i)) {
if (!inRange) {
inRange = true;
start = i;
}
} else {
if (inRange) {
end = i - 1;
inRange = false;
System.out.print(" \"" + asUnicodeEscape(start) + "\"");
if (start == end) {
System.out.println(",");
} else {
System.out.println("-\"" + asUnicodeEscape(end) + "\",");
}
}
}
}
}
/*
* Java Digit is all characters where Character.isJavaIdentifierPart() returns true that aren't included in Java
* Letter.
*/
@Test
public void testGenerateJavaDigitRanges() {
int start = 0;
int end = 0;
boolean inRange = false;
for (int i = 0 ; i < 0xFFFF; i++) {
if (Character.isJavaIdentifierPart(i) && !Character.isJavaIdentifierStart(i)) {
if (!inRange) {
inRange = true;
start = i;
}
} else {
if (inRange) {
end = i - 1;
inRange = false;
System.out.print(" \"" + asUnicodeEscape(start) + "\"");
if (start == end) {
System.out.println(",");
} else {
System.out.println("-\"" + asUnicodeEscape(end) + "\",");
}
}
}
}
}
private static String asUnicodeEscape(int input) {
return String.format("\\u%04x", Integer.valueOf(input));
}
}