1 /** 2 * Copyright 2007 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.tonicsystems.jarjar; 18 19 import java.io.*; 20 import java.util.*; 21 22 class RulesFileParser 23 { RulesFileParser()24 private RulesFileParser() { 25 } 26 parse(File file)27 public static List<PatternElement> parse(File file) throws IOException { 28 return parse(new FileReader(file)); 29 } 30 parse(String value)31 public static List<PatternElement> parse(String value) throws IOException { 32 return parse(new java.io.StringReader(value)); 33 } 34 stripComment(String in)35 private static String stripComment(String in) { 36 int p = in.indexOf("#"); 37 return p < 0 ? in : in.substring(0, p); 38 } 39 parse(Reader r)40 private static List<PatternElement> parse(Reader r) throws IOException { 41 try { 42 List<PatternElement> patterns = new ArrayList<PatternElement>(); 43 BufferedReader br = new BufferedReader(r); 44 int c = 1; 45 String line; 46 while ((line = br.readLine()) != null) { 47 line = stripComment(line); 48 if (line.isEmpty()) 49 continue; 50 String[] parts = line.split("\\s+"); 51 if (parts.length < 2) 52 error(c, parts); 53 String type = parts[0]; 54 PatternElement element = null; 55 if (type.equals("rule")) { 56 if (parts.length < 3) 57 error(c, parts); 58 Rule rule = new Rule(); 59 rule.setResult(parts[2]); 60 element = rule; 61 } else if (type.equals("zap")) { 62 element = new Zap(); 63 } else if (type.equals("keep")) { 64 element = new Keep(); 65 } else { 66 error(c, parts); 67 } 68 element.setPattern(parts[1]); 69 patterns.add(element); 70 c++; 71 } 72 return patterns; 73 } finally { 74 r.close(); 75 } 76 } 77 error(int line, String[] parts)78 private static void error(int line, String[] parts) { 79 throw new IllegalArgumentException("Error on line " + line + ": " + Arrays.asList(parts)); 80 } 81 } 82