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annotate src/luan/lib/TableLib.java @ 130:0594c132888b

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cleanup git-svn-id: https://luan-java.googlecode.com/svn/trunk@131 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 10 Jun 2014 02:43:40 +0000
parents f537ff5e511d
children 3119326260ea
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rev   line source
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1 package luan.lib;
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3 import java.util.Comparator;
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4 import java.util.List;
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5 import java.util.ArrayList;
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6 import java.util.Arrays;
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7 import luan.Luan;
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8 import luan.LuanState;
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9 import luan.LuanTable;
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10 import luan.LuanFunction;
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11 import luan.LuanJavaFunction;
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12 import luan.LuanElement;
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13 import luan.LuanException;
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14 import luan.LuanRuntimeException;
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17 public final class TableLib {
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18
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19 public static void load(LuanState luan) throws LuanException {
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20 luan.load("Table",LOADER);
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21 }
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23 public static final LuanFunction LOADER = new LuanFunction() {
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24 @Override public Object call(LuanState luan,Object[] args) {
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25 LuanTable module = new LuanTable();
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26 try {
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27 add( module, "concat", LuanState.class, LuanTable.class, String.class, Integer.class, Integer.class );
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28 add( module, "insert", LuanState.class, LuanTable.class, Integer.TYPE, Object.class );
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29 add( module, "pack", new Object[0].getClass() );
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30 add( module, "remove", LuanState.class, LuanTable.class, Integer.TYPE );
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31 add( module, "sort", LuanState.class, LuanTable.class, LuanFunction.class );
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32 add( module, "sub_list", LuanTable.class, Integer.TYPE, Integer.TYPE );
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33 add( module, "unpack", LuanTable.class, Integer.class, Integer.class );
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34 } catch(NoSuchMethodException e) {
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35 throw new RuntimeException(e);
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36 }
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37 return module;
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38 }
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39 };
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41 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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42 t.put( method, new LuanJavaFunction(TableLib.class.getMethod(method,parameterTypes),null) );
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43 }
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45 public static String concat(LuanState luan,LuanTable list,String sep,Integer i,Integer j) throws LuanException {
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46 int first = i==null ? 1 : i;
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47 int last = j==null ? list.length() : j;
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48 StringBuilder buf = new StringBuilder();
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49 for( int k=first; k<=last; k++ ) {
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50 Object val = list.get(k);
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51 if( val==null )
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52 break;
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53 if( sep!=null && k > first )
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54 buf.append(sep);
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55 String s = Luan.asString(val);
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56 if( s==null )
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57 throw luan.exception( "invalid value ("+Luan.type(val)+") at index "+k+" in table for 'concat'" );
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58 buf.append(val);
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59 }
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60 return buf.toString();
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61 }
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63 public static void insert(LuanState luan,LuanTable list,int pos,Object value) throws LuanException {
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64 try {
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65 list.insert(pos,value);
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66 } catch(IndexOutOfBoundsException e) {
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67 throw luan.exception(e);
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68 }
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69 }
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71 public static Object remove(LuanState luan,LuanTable list,int pos) throws LuanException {
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72 try {
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73 return list.remove(pos);
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74 } catch(IndexOutOfBoundsException e) {
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75 throw luan.exception(e);
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76 }
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77 }
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79 private static interface LessThan {
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80 public boolean isLessThan(Object o1,Object o2);
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81 }
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83 public static void sort(final LuanState luan,LuanTable list,final LuanFunction comp) throws LuanException {
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84 final LessThan lt;
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85 if( comp==null ) {
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86 lt = new LessThan() {
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87 public boolean isLessThan(Object o1,Object o2) {
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88 try {
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89 return luan.isLessThan(o1,o2);
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90 } catch(LuanException e) {
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91 throw new LuanRuntimeException(e);
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92 }
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93 }
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94 };
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95 } else {
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96 lt = new LessThan() {
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97 public boolean isLessThan(Object o1,Object o2) {
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98 try {
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99 return Luan.toBoolean(Luan.first(luan.call(comp,"comp-arg",new Object[]{o1,o2})));
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100 } catch(LuanException e) {
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101 throw new LuanRuntimeException(e);
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102 }
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103 }
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104 };
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105 }
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106 try {
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107 list.sort( new Comparator<Object>() {
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108 public int compare(Object o1,Object o2) {
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109 return lt.isLessThan(o1,o2) ? -1 : lt.isLessThan(o2,o1) ? 1 : 0;
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110 }
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111 } );
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112 } catch(LuanRuntimeException e) {
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113 throw (LuanException)e.getCause();
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114 }
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115 }
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116
118
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117 public static LuanTable pack(Object... args) {
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118 return new LuanTable(new ArrayList<Object>(Arrays.asList(args)));
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119 }
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120
118
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121 public static Object[] unpack(LuanTable tbl,Integer iFrom,Integer iTo) {
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122 int from = iFrom!=null ? iFrom : 1;
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123 int to = iTo!=null ? iTo : tbl.length();
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124 List<Object> list = new ArrayList<Object>();
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125 for( int i=from; i<=to; i++ ) {
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126 list.add( tbl.get(i) );
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127 }
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128 return list.toArray();
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129 }
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130
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131 public static LuanTable sub_list(LuanTable list,int from,int to) {
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132 return list.subList(from,to);
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133 }
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134
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135 }