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annotate core/src/luan/AbstractLuanTable.java @ 364:1a464e090538 0.3

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simplify table code
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 16 Apr 2015 11:51:21 -0600
parents 1bce334a816b
children 5e0acdeaea93
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1 package luan;
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3 import java.util.Iterator;
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4 import java.util.ListIterator;
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5 import java.util.Map;
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6 import java.util.LinkedHashMap;
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7 import java.util.List;
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8 import java.util.ArrayList;
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9 import java.util.Collections;
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10 import java.util.Comparator;
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11 import java.util.Set;
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12 import java.util.HashSet;
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13 import java.util.IdentityHashMap;
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14 import java.util.regex.Pattern;
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17 public abstract class AbstractLuanTable implements LuanTable, LuanRepr {
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19 protected final Map<Object,Object> newMap() {
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20 return new LinkedHashMap<Object,Object>();
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21 }
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23 @Override public boolean isEmpty() {
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24 return isList() && length()==0;
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25 }
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27 @Override public boolean isList() {
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28 return asList().size() == asMap().size();
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29 }
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31 @Override public List<Object> asList() {
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32 return Collections.emptyList();
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33 }
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35 @Override public Map<Object,Object> asMap() {
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36 Map<Object,Object> map = newMap();
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37 for( Map.Entry<Object,Object> entry : this ) {
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38 map.put(entry.getKey(),entry.getValue());
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39 }
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40 return map;
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41 }
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43 // shouldn't include list
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44 protected Map<Object,Object> map() {
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45 return asMap();
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46 }
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47
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48 protected abstract String type();
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50 @Override public final String toString() {
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51 return type() + ": " + Integer.toHexString(hashCode());
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52 }
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54 @Override public void put(Object key,Object val) {
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55 throw new UnsupportedOperationException("can't put into a "+type());
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56 }
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58 @Override public void insert(int pos,Object value) {
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59 throw new UnsupportedOperationException("can't insert into a "+type());
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60 }
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62 @Override public void add(Object value) {
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63 throw new UnsupportedOperationException("can't add to a "+type());
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64 }
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66 @Override public Object remove(int pos) {
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67 throw new UnsupportedOperationException("can't remove from a "+type());
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68 }
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70 @Override public void sort(Comparator<Object> cmp) {
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71 }
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73 @Override public int length() {
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74 return 0;
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75 }
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77 @Override public LuanTable subList(int from,int to) {
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78 throw new UnsupportedOperationException("can't get a sub-list of a "+type());
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79 }
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81 @Override public LuanTable getMetatable() {
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82 return null;
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83 }
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85 @Override public void setMetatable(LuanTable metatable) {
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86 throw new UnsupportedOperationException("can't set a metatable on a "+type());
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87 }
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89 @Override public LuanTable cloneTable() {
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90 return isList() ? new LuanTableImpl(new ArrayList<Object>(asList())) : new LuanTableImpl(asMap());
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91 }
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93 @Override public boolean hasJava() {
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94 throw new UnsupportedOperationException();
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95 }
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97 @Override public void setJava() {
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98 throw new UnsupportedOperationException();
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99 }
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101 @Override public String repr() {
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102 return repr( Collections.newSetFromMap(new IdentityHashMap<AbstractLuanTable,Boolean>()) );
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103 }
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104
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105 private String repr(Set<AbstractLuanTable> set) {
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106 if( !set.add(this) ) {
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107 return "\"<circular reference>\"";
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108 }
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109 StringBuilder sb = new StringBuilder();
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110 sb.append('{');
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111 boolean isFirst = true;
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112 for( Object obj : asList() ) {
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113 if( isFirst ) {
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114 isFirst = false;
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115 } else {
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116 sb.append(", ");
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117 }
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118 sb.append(repr(set,obj));
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119 }
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120 for( Map.Entry<Object,Object> entry : map().entrySet() ) {
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121 if( isFirst ) {
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122 isFirst = false;
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123 } else {
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124 sb.append(", ");
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125 }
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126 sb.append(reprKey(set,entry.getKey())).append('=').append(repr(set,entry.getValue()));
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127 }
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128 sb.append('}');
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129 return sb.toString();
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130 }
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131
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132 private static final Pattern namePtn = Pattern.compile("[a-zA-Z_][a-zA-Z_0-9]*");
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133
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134 private String reprKey(Set<AbstractLuanTable> set,Object obj) {
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135 if( obj instanceof String ) {
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136 String s = (String)obj;
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137 if( namePtn.matcher(s).matches() )
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138 return s;
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139 }
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140 return "[" + repr(set,obj) + "]";
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141 }
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142
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143 String repr(Set<AbstractLuanTable> set,Object obj) {
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144 if( obj instanceof AbstractLuanTable ) {
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145 AbstractLuanTable t = (AbstractLuanTable)obj;
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146 return t.repr(set);
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147 } else {
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148 String s = Luan.repr(obj);
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149 if( s == null )
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150 s = "<couldn't repr: " + Luan.stringEncode(Luan.toString(obj)) + ">";
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151 return s;
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152 }
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153 }
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154
222
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155 }