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annotate core/src/luan/LuanTable.java @ 419:8fbb961aabd5

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improve repr() to check metamethod recursively
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 30 Apr 2015 23:15:40 -0600
parents d2ab2240cc65
children af82b266fe89
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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1 package luan;
2df768b926aa start Luan
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2
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3 import java.util.Iterator;
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4 import java.util.ListIterator;
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2df768b926aa start Luan
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5 import java.util.Map;
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b76fcb72d97d add AbstractLuanTable and improve HttpLuan
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6 import java.util.AbstractMap;
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7 import java.util.LinkedHashMap;
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8 import java.util.List;
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9 import java.util.ArrayList;
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10 import java.util.Collections;
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11 import java.util.Comparator;
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12 import java.util.Set;
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13 import java.util.HashSet;
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cd9dbd7477ca prevent stack overflow when printing table with circular references
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14 import java.util.IdentityHashMap;
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15 import java.util.regex.Pattern;
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2df768b926aa start Luan
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2df768b926aa start Luan
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17
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18 public final class LuanTable implements Iterable<Map.Entry<Object,Object>>, LuanRepr, DeepCloneable<LuanTable> {
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19 private Map<Object,Object> map = null;
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20 private List<Object> list = null;
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21 private LuanTable metatable = null;
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22 private boolean hasJava = false;
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23
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24 public LuanTable() {}
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25
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23b99a5039b5 remove Luan.newTable()
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26 public LuanTable(List<Object> list) {
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27 this.list = list;
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28 this.map = newMap();
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29 map.put("n",list.size());
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30 for( int i=0; i<list.size(); i++ ) {
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31 if( list.get(i) == null ) {
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32 listToMap(i);
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33 break;
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34 }
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35 }
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36 }
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2df768b926aa start Luan
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37
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38 LuanTable(Map<Object,Object> map) {
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39 map.remove(null);
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40 for( Iterator<Object> i=map.values().iterator(); i.hasNext(); ) {
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41 if( i.next() == null )
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42 i.remove();
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43 }
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44 this.map = map;
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45 }
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46
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47 LuanTable(Set<Object> set) {
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48 map = newMap();
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49 for( Object obj : set ) {
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50 if( obj != null )
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51 map.put(obj,Boolean.TRUE);
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52 }
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53 }
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54
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55 @Override public LuanTable shallowClone() {
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56 return new LuanTable();
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57 }
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58
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59 @Override public void deepenClone(LuanTable clone,DeepCloner cloner) {
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60 if( map != null ) {
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61 clone.map = newMap();
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62 for( Map.Entry<Object,Object> entry : map.entrySet() ) {
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63 clone.map.put( cloner.get(entry.getKey()), cloner.get(entry.getValue()) );
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64 }
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65 }
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66 if( list != null ) {
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67 clone.list = new ArrayList<Object>();
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68 for( Object obj : list ) {
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69 clone.list.add( cloner.get(obj) );
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70 }
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71 }
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72 if( metatable != null )
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73 clone.metatable = cloner.get(metatable);
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74 clone.hasJava = hasJava;
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75 }
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76
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77 public boolean isList() {
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78 return map==null || map.isEmpty();
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79 }
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80
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81 public List<Object> asList() {
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82 return list!=null ? list : Collections.emptyList();
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83 }
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84
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85 private Map<Object,Object> map() {
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86 return map!=null ? map : Collections.emptyMap();
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87 }
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88 /*
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89 @Override public boolean isSet() {
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90 if( list != null ) {
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91 for( Object obj : list ) {
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92 if( obj!=null && !obj.equals(Boolean.TRUE) )
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93 return false;
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94 }
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95 }
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96 if( map != null ) {
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97 for( Object obj : map.values() ) {
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98 if( !obj.equals(Boolean.TRUE) )
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99 return false;
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100 }
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101 }
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102 return true;
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103 }
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104
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105 @Override public Set<Object> asSet() {
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106 if( list == null || list.isEmpty() )
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107 return map!=null ? map.keySet() : Collections.emptySet();
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108 Set<Object> rtn = map!=null ? new HashSet<Object>(map.keySet()) : new HashSet<Object>();
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109 for( int i=1; i<=list.size(); i++ ) {
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110 rtn.add(i);
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111 }
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112 return rtn;
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113 }
397
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114 */
84
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115
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116 public Object get(Object key) {
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117 if( list != null ) {
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118 Integer iT = Luan.asInteger(key);
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119 if( iT != null ) {
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120 int i = iT - 1;
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121 if( i>=0 && i<list.size() )
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122 return list.get(i);
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123 }
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124 }
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125 if( map==null )
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126 return null;
1
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127 return map.get(key);
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128 }
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129
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130 public void put(Object key,Object val) {
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131 Integer iT = Luan.asInteger(key);
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132 if( iT != null ) {
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133 int i = iT - 1;
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134 if( list != null || i == 0 ) {
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135 if( i == list().size() ) {
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136 if( val != null ) {
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137 list.add(val);
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138 mapToList();
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139 }
224
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140 return;
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141 } else if( i>=0 && i<list.size() ) {
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142 list.set(i,val);
118
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143 if( val == null ) {
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144 listToMap(i);
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145 }
224
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146 return;
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147 }
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148 }
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149 }
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150 if( map==null ) {
284
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151 map = newMap();
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152 }
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153 if( key instanceof Number && !(key instanceof Double) ) {
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154 Number n = (Number)key;
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155 key = Double.valueOf(n.doubleValue());
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156 }
1
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157 if( val == null ) {
224
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diff changeset
158 map.remove(key);
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159 } else {
224
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diff changeset
160 map.put(key,val);
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161 }
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162 }
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163
47
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164 private void mapToList() {
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165 if( map != null ) {
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166 while(true) {
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167 Object v = map.remove(Double.valueOf(list.size()+1));
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168 if( v == null )
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169 break;
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170 list.add(v);
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171 }
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172 }
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173 }
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174
118
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175 private void listToMap(int from) {
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176 if( list != null ) {
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diff changeset
177 while( list.size() > from ) {
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178 int i = list.size() - 1;
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179 Object v = list.remove(i);
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180 if( v != null ) {
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181 if( map==null )
284
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182 map = newMap();
118
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183 map.put(i+1,v);
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184 }
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185 }
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186 }
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187 }
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188
47
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189 private List<Object> list() {
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190 if( list == null ) {
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191 list = new ArrayList<Object>();
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192 mapToList();
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193 }
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194 return list;
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195 }
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196
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diff changeset
197 public void insert(int pos,Object value) {
108
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198 if( value==null )
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diff changeset
199 throw new IllegalArgumentException("can't insert a nil value");
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200 list().add(pos-1,value);
108
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201 mapToList();
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202 }
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diff changeset
203
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diff changeset
204 public void add(Object value) {
108
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205 if( value==null )
222
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diff changeset
206 throw new IllegalArgumentException("can't add a nil value");
108
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diff changeset
207 list().add(value);
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208 mapToList();
44
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209 }
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diff changeset
210
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diff changeset
211 public Object remove(int pos) {
47
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212 return list().remove(pos-1);
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213 }
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214
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diff changeset
215 public void sort(Comparator<Object> cmp) {
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diff changeset
216 Collections.sort(list(),cmp);
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217 }
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218
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219 public int length() {
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220 return list==null ? 0 : list.size();
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221 }
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222
221
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223 @Override public Iterator<Map.Entry<Object,Object>> iterator() {
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224 if( list == null ) {
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225 if( map == null )
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226 return Collections.<Map.Entry<Object,Object>>emptyList().iterator();
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227 return map.entrySet().iterator();
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228 }
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229 if( map == null )
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230 return listIterator();
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231 return new Iterator<Map.Entry<Object,Object>>() {
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232 Iterator<Map.Entry<Object,Object>> iter = listIterator();
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233 boolean isList = true;
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234 public boolean hasNext() {
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235 boolean b = iter.hasNext();
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236 if( !b && isList ) {
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237 iter = map.entrySet().iterator();
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238 isList = false;
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239 b = iter.hasNext();
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240 }
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241 return b;
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242 }
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243 public Map.Entry<Object,Object> next() {
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244 return iter.next();
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245 }
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246 public void remove() {
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247 throw new UnsupportedOperationException();
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248 }
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249 };
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250 }
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251
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252 private Iterator<Map.Entry<Object,Object>> listIterator() {
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253 if( list == null )
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254 return Collections.<Map.Entry<Object,Object>>emptyList().iterator();
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255 final ListIterator iter = list.listIterator();
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256 return new Iterator<Map.Entry<Object,Object>>() {
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257 public boolean hasNext() {
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258 return iter.hasNext();
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259 }
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260 public Map.Entry<Object,Object> next() {
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261 Double key = Double.valueOf(iter.nextIndex()+1);
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262 return new AbstractMap.SimpleEntry<Object,Object>(key,iter.next());
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263 }
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264 public void remove() {
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265 throw new UnsupportedOperationException();
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266 }
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267 };
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268 }
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269
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270 public LuanTable subList(int from,int to) {
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271 LuanTable tbl = shallowClone();
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272 tbl.list = new ArrayList<Object>(list().subList(from-1,to-1));
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273 return tbl;
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274 }
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275
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276 public LuanTable getMetatable() {
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277 return metatable;
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278 }
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279
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280 public void setMetatable(LuanTable metatable) {
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281 this.metatable = metatable;
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282 }
300
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283
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284 public Object getHandler(String op) {
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285 LuanTable t = getMetatable();
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286 return t==null ? null : t.get(op);
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287 }
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288
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289 public boolean hasJava() {
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290 return hasJava;
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291 }
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292
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293 public void setJava() {
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294 hasJava = true;
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295 }
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296
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297
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298 // from AbstractLuanTable
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299
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300 protected final Map<Object,Object> newMap() {
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301 return new LinkedHashMap<Object,Object>();
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302 }
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303
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304 public boolean isEmpty() {
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305 return isList() && length()==0;
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306 }
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307
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308 public boolean isSet() {
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309 for( Map.Entry<Object,Object> entry : this ) {
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310 if( !entry.getValue().equals(Boolean.TRUE) )
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311 return false;
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312 }
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313 return true;
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314 }
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315
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316 public Set<Object> asSet() {
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317 Set<Object> set = new HashSet<Object>();
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318 for( Map.Entry<Object,Object> entry : this ) {
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319 set.add(entry.getKey());
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320 }
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321 return set;
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322 }
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323
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324 public Map<Object,Object> asMap() {
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325 Map<Object,Object> map = newMap();
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326 for( Map.Entry<Object,Object> entry : this ) {
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327 map.put(entry.getKey(),entry.getValue());
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328 }
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329 return map;
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330 }
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331
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332 public LuanTable cloneTable() {
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333 return isList() ? new LuanTable(new ArrayList<Object>(asList())) : new LuanTable(asMap());
406
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334 }
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335
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336 @Override public String repr(LuanState luan) throws LuanException {
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337 LuanFunction fn = luan.JAVA.getHandlerFunction("__repr",this);
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338 if( fn != null )
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339 return luan.JAVA.checkString( Luan.first( luan.call(fn,"__repr",new Object[]{this}) ) );
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340 return repr( luan, Collections.newSetFromMap(new IdentityHashMap<LuanTable,Boolean>()) );
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341 }
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342
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343 private String repr(LuanState luan,Set<LuanTable> set) throws LuanException {
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344 if( !set.add(this) ) {
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345 return "\"<circular reference>\"";
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346 }
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347 StringBuilder sb = new StringBuilder();
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348 sb.append('{');
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349 boolean isFirst = true;
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350 for( Object obj : asList() ) {
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351 if( isFirst ) {
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352 isFirst = false;
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353 } else {
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354 sb.append(", ");
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355 }
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356 sb.append(repr(luan,set,obj));
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357 }
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358 for( Map.Entry<Object,Object> entry : map().entrySet() ) {
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359 if( isFirst ) {
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360 isFirst = false;
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361 } else {
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362 sb.append(", ");
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363 }
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364 sb.append(reprKey(luan,set,entry.getKey())).append('=').append(repr(luan,set,entry.getValue()));
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365 }
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366 sb.append('}');
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367 return sb.toString();
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368 }
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369
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370 private static final Pattern namePtn = Pattern.compile("[a-zA-Z_][a-zA-Z_0-9]*");
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371
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372 private String reprKey(LuanState luan,Set<LuanTable> set,Object obj) throws LuanException {
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373 if( obj instanceof String ) {
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374 String s = (String)obj;
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375 if( namePtn.matcher(s).matches() )
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376 return s;
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377 }
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378 return "[" + repr(luan,set,obj) + "]";
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379 }
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380
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381 private String repr(LuanState luan,Set<LuanTable> set,Object obj) throws LuanException {
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382 if( obj instanceof LuanTable ) {
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383 LuanTable t = (LuanTable)obj;
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384 return t.repr(luan,set);
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385 } else {
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386 String s = luan.repr(obj);
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387 if( s == null )
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388 s = "<couldn't repr: " + Luan.stringEncode(Luan.toString(obj)) + ">";
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389 return s;
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390 }
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391 }
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392
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393 @Override public final String toString() {
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394 return "table:" + Integer.toHexString(hashCode());
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395 }
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396
1
2df768b926aa start Luan
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397 }