ecki commented on code in PR #589: URL: https://github.com/apache/commons-text/pull/589#discussion_r2656512300
########## src/main/java/org/apache/commons/text/translate/HexUnescaper.java: ########## @@ -0,0 +1,53 @@ +/* + * 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.commons.text.translate; + +import java.io.IOException; +import java.io.Writer; + +/** + * Translates escaped ASCII values of the form \\x\[0-9A-Fa-f][0-9A-Fa-f] back to ASCII. + */ +public class HexUnescaper extends CharSequenceTranslator { + + /** + * {@inheritDoc} + */ + @Override + public int translate(final CharSequence input, final int index, final Writer writer) throws IOException { + final int prefixLength = 2; // "\\x".length() + final int escapeLength = 4; // "\\xHH".length() + if (input.charAt(index) == '\\' && index + 1 < input.length() && input.charAt(index + 1) == 'x') { + if (index + escapeLength <= input.length()) { + // Get 2 hex digits + final CharSequence hex = input.subSequence(index + prefixLength, index + escapeLength); + + try { + final int value = Integer.parseInt(hex.toString(), 16); + writer.write((char) value); + } catch (final NumberFormatException nfe) { + throw new IllegalArgumentException("Unable to parse ASCII value: " + hex, nfe); Review Comment: We probably need to document the IAE for the unescape functions and translator objects. An Abort is valid, it is a Syntax error in ECMAScript (need to verify the same for Java) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
