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annotate src/luan/lib/TableLib.java @ 44:57054fa43189

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implement table lib git-svn-id: https://luan-java.googlecode.com/svn/trunk@45 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 26 Dec 2012 23:53:25 +0000
parents
children b1b14d09fc98
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44
57054fa43189 implement table lib
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1 package luan.lib;
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2
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3 import java.util.Comparator;
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4 import java.util.ArrayList;
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5 import java.util.Arrays;
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6 import luan.Lua;
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7 import luan.LuaState;
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8 import luan.LuaTable;
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9 import luan.LuaNumber;
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10 import luan.LuaFunction;
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11 import luan.LuaJavaFunction;
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12 import luan.LuaElement;
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13 import luan.LuaException;
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16 public final class TableLib {
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18 public static void register(LuaState lua) {
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19 LuaTable module = new LuaTable();
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20 LuaTable global = lua.global();
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21 global.put("table",module);
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22 try {
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23 add( module, "concat", LuaState.class, LuaTable.class, String.class, Integer.class, Integer.class );
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24 add( module, "insert", LuaState.class, LuaTable.class, Integer.TYPE, Object.class );
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25 add( module, "pack", new Object[0].getClass() );
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26 add( module, "remove", LuaState.class, LuaTable.class, Integer.TYPE );
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27 add( module, "sort", LuaState.class, LuaTable.class, LuaFunction.class );
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28 add( module, "sub_list", LuaTable.class, Integer.TYPE, Integer.TYPE );
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29 add( module, "unpack", LuaTable.class );
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30 } catch(NoSuchMethodException e) {
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31 throw new RuntimeException(e);
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32 }
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33 }
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35 private static void add(LuaTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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36 t.put( method, new LuaJavaFunction(TableLib.class.getMethod(method,parameterTypes),null) );
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37 }
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39 public static String concat(LuaState lua,LuaTable list,String sep,Integer i,Integer j) throws LuaException {
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40 int first = i==null ? 1 : i;
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41 int last = j==null ? list.length() : j;
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42 StringBuilder buf = new StringBuilder();
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43 for( int k=first; k<=last; k++ ) {
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44 Object val = list.get(LuaNumber.of(k));
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45 if( val==null )
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46 break;
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47 if( sep!=null && k > first )
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48 buf.append(sep);
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49 String s = Lua.asString(val);
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50 if( s==null )
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51 throw new LuaException( lua, LuaElement.JAVA, "invalid value ("+Lua.type(val)+") at index "+k+" in table for 'concat'" );
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52 buf.append(val);
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53 }
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54 return buf.toString();
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55 }
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56
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57 public static void insert(LuaState lua,LuaTable list,int pos,Object value) throws LuaException {
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58 try {
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59 list.insert(pos,value);
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60 } catch(IndexOutOfBoundsException e) {
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61 throw new LuaException( lua, LuaElement.JAVA, e);
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62 }
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63 }
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64
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65 public static Object remove(LuaState lua,LuaTable list,int pos) throws LuaException {
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66 try {
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67 return list.remove(pos);
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68 } catch(IndexOutOfBoundsException e) {
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69 throw new LuaException( lua, LuaElement.JAVA, e);
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70 }
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71 }
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73 private static interface LessThan {
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74 public boolean isLessThan(Object o1,Object o2);
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75 }
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76
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77 public static void sort(final LuaState lua,LuaTable list,final LuaFunction comp) throws LuaException {
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78 final LessThan lt;
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79 if( comp==null ) {
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80 lt = new LessThan() {
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81 public boolean isLessThan(Object o1,Object o2) {
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82 try {
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83 return lua.isLessThan(LuaElement.JAVA,o1,o2);
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84 } catch(LuaException e) {
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85 throw new LuaRuntimeException(e);
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86 }
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87 }
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88 };
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89 } else {
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90 lt = new LessThan() {
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91 public boolean isLessThan(Object o1,Object o2) {
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92 try {
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93 return Lua.toBoolean(lua.call(comp,LuaElement.JAVA,"comp-arg",o1,o2));
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94 } catch(LuaException e) {
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95 throw new LuaRuntimeException(e);
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96 }
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97 }
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98 };
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99 }
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100 try {
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101 list.sort( new Comparator<Object>() {
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102 public int compare(Object o1,Object o2) {
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103 return lt.isLessThan(o1,o2) ? -1 : lt.isLessThan(o2,o1) ? 1 : 0;
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104 }
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105 } );
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106 } catch(LuaRuntimeException e) {
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107 throw (LuaException)e.getCause();
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108 }
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109 }
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110
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111 public static LuaTable pack(Object[] args) {
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112 return new LuaTable(new ArrayList<Object>(Arrays.asList(args)));
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113 }
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114
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115 public static Object[] unpack(LuaTable list) {
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116 return list.listToArray();
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117 }
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118
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119 public static LuaTable sub_list(LuaTable list,int from,int to) {
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120 return list.subList(from,to);
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121 }
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122
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123 }