| /* |
| * 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 |
| * |
| * https://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.tools.ant.util; |
| |
| /** |
| * Contains helper methods for Ant's built-in implementation of native2ascii. |
| * |
| * @since Ant 1.9.8 |
| */ |
| public class Native2AsciiUtils { |
| |
| private static final int MAX_ASCII = 127; |
| |
| /** |
| * Replaces non-ASCII characters with their Unicode-Escapes. |
| * <p>Expects to be called once per line if applied to a file.</p> |
| * @param line the input line |
| * @return the translated line |
| */ |
| public static String native2ascii(String line) { |
| StringBuilder sb = new StringBuilder(); |
| for (char c : line.toCharArray()) { |
| if (c <= MAX_ASCII) { |
| sb.append(c); |
| } else { |
| sb.append(String.format("\\u%04x", (int) c)); |
| } |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Replaces Unicode-Escapes. |
| * <p>Expects to be called once per line if applied to a file.</p> |
| * @param line the input line |
| * @return the translated line |
| */ |
| public static String ascii2native(String line) { |
| StringBuilder sb = new StringBuilder(); |
| int inputLen = line.length(); |
| for (int i = 0; i < inputLen; i++) { |
| char c = line.charAt(i); |
| if (c != '\\' || i >= inputLen - 5) { |
| sb.append(c); |
| } else { // backslash with enough remaining characters |
| char u = line.charAt(++i); |
| if (u == 'u') { |
| int unescaped = tryParse(line, i + 1); |
| if (unescaped >= 0) { |
| sb.append((char) unescaped); |
| i += 4; |
| continue; |
| } |
| } |
| // not a unicode escape |
| sb.append(c).append(u); |
| } |
| } |
| return sb.toString(); |
| } |
| |
| private static int tryParse(String line, int startIdx) { |
| try { |
| return Integer.parseInt(line.substring(startIdx, startIdx + 4), 16); |
| } catch (NumberFormatException ex) { |
| return -1; |
| } |
| } |
| } |