1 /*
   2  * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package build.tools.projectcreator;
  26 
  27 class ArgIterator {
  28     String[] args;
  29     int i;
  30     ArgIterator(String[] args) {
  31         this.args = args;
  32         this.i = 0;
  33     }
  34     String get() { return args[i]; }
  35     boolean hasMore() { return args != null && i  < args.length; }
  36     boolean next() { return ++i < args.length; }
  37 }
  38 
  39 abstract class ArgHandler {
  40     public abstract void handle(ArgIterator it);
  41 
  42 }
  43 
  44 class ArgRule {
  45     String arg;
  46     ArgHandler handler;
  47     ArgRule(String arg, ArgHandler handler) {
  48         this.arg = arg;
  49         this.handler = handler;
  50     }
  51 
  52     boolean process(ArgIterator it) {
  53         if (match(it.get(), arg)) {
  54             handler.handle(it);
  55             return true;
  56         }
  57         return false;
  58     }
  59     boolean match(String rule_pattern, String arg) {
  60         return arg.equals(rule_pattern);
  61     }
  62 }
  63 
  64 class ArgsParser {
  65     ArgsParser(String[] args,
  66                ArgRule[] rules,
  67                ArgHandler defaulter) {
  68         ArgIterator ai = new ArgIterator(args);
  69         while (ai.hasMore()) {
  70             boolean processed = false;
  71             for (int i=0; i<rules.length; i++) {
  72                 processed |= rules[i].process(ai);
  73                 if (processed) {
  74                     break;
  75                 }
  76             }
  77             if (!processed) {
  78                 if (defaulter != null) {
  79                     defaulter.handle(ai);
  80                 } else {
  81                     System.err.println("ERROR: unparsed \""+ai.get()+"\"");
  82                     ai.next();
  83                 }
  84             }
  85         }
  86     }
  87 }