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annotate src/luan/CmdLine.java @ 29:9bc66d09ea48

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CmdLine improvements git-svn-id: https://luan-java.googlecode.com/svn/trunk@30 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 07 Dec 2012 09:33:31 +0000
parents 409871b33355
children 8d8f4f5caef4
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
1 package luan;
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2
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3 import java.io.InputStreamReader;
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4 import java.util.Arrays;
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5 import java.util.Scanner;
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6 import luan.lib.BasicLib;
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9 public class CmdLine {
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10 static final String version = "Luan 0.0";
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12 public static void main(String[] args) throws Exception {
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13 LuaState lua = new LuaState();
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14 BasicLib.register(lua);
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15 boolean interactive = false;
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16 boolean showVersion = false;
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17 int i = 0;
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18 if( args.length == 0 ) {
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19 interactive = true;
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20 showVersion = true;
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21 } else {
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22 while( i < args.length ) {
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23 String arg = args[i++];
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24 if( !arg.startsWith("-") || arg.equals("--") )
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25 break;
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26 if( arg.equals("-i") ) {
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27 interactive = true;
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28 } else if( arg.equals("-v") ) {
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29 showVersion = true;
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30 } else if( arg.equals("-e") ) {
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31 if( i == args.length )
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32 error("'-e' needs argument");
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33 String cmd = args[i++];
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34 try {
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35 LuaFunction fn = BasicLib.load(lua,cmd);
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36 fn.call(lua);
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37 } catch(LuaException e) {
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38 System.err.println("command line error: "+e.getMessage());
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39 System.exit(-1);
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40 }
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41 } else if( arg.equals("-") ) {
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42 String cmd = BasicLib.readAll(new InputStreamReader(System.in));
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43 try {
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44 LuaFunction fn = BasicLib.load(lua,cmd);
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45 fn.call(lua);
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46 } catch(LuaException e) {
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47 System.err.println(e.getMessage());
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48 System.exit(-1);
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49 }
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50 System.exit(0);
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51 } else {
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52 error("unrecognized option '"+arg+"'");
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53 }
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54 }
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55 }
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56 if( showVersion )
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57 System.out.println(version);
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58 if( i < args.length ) {
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59 String file = args[i++];
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60 Object[] varArgs = new Object[args.length-1];
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61 System.arraycopy(args,1,varArgs,0,varArgs.length);
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62 LuaTable argsTable = new LuaTable();
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63 for( int j=0; j<args.length; j++ ) {
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64 argsTable.set( new LuaNumber(j), args[j] );
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65 }
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66 lua.env().set("arg",argsTable);
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67 try {
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68 LuaFunction fn = BasicLib.loadfile(lua,file);
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69 fn.call(lua,varArgs);
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70 } catch(LuaException e) {
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71 // System.err.println(e.getMessage());
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72 e.printStackTrace();
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73 System.exit(-1);
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74 }
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75 }
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76 if( interactive )
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77 interactive(lua);
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78 }
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79
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80 private static void error(String msg) {
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81 System.err.println(msg);
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82 System.err.println("usage: java luan.CmdLine [options] [script [args]]");
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83 System.err.println("Available options are:");
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84 System.err.println(" -e stat execute string 'stat'");
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85 System.err.println(" -i enter interactive mode after executing 'script'");
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86 // System.err.println(" -l name require library 'name'");
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87 System.err.println(" -v show version information");
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88 // System.err.println(" -E ignore environment variables");
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89 System.err.println(" -- stop handling options");
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90 System.err.println(" - stop handling options and execute stdin");
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91 System.exit(-1);
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92 }
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93
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94 static void interactive(LuaState lua) {
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95 while( true ) {
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96 System.out.print("> ");
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97 String input = new Scanner(System.in).nextLine();
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98 try {
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99 LuaFunction fn = BasicLib.load(lua,input);
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100 Object[] rtn = fn.call(lua);
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101 if( rtn.length > 0 )
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102 BasicLib.print(rtn);
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103 } catch(LuaException e) {
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104 System.out.println(e.getMessage());
11
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105 }
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106 }
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107 }
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108 }