Mercurial Hosting > luan
annotate src/luan/lib/json/JsonToString.java @ 1132:b70102bab110
add json_compressed_string()
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Tue, 02 Jan 2018 21:30:41 -0700 |
parents | 9a1aa6fc0b4e |
children | 9dca1e912658 |
rev | line source |
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1113 | 1 package luan.lib.json; |
720 | 2 |
3 import java.util.List; | |
4 import java.util.Map; | |
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5 import java.util.Iterator; |
720 | 6 |
7 | |
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8 public class JsonToString { |
720 | 9 |
1113 | 10 public static final class JsonException extends RuntimeException { |
11 private JsonException(String msg) { | |
12 super(msg); | |
13 } | |
14 } | |
15 | |
16 public static String toString(Object obj) throws JsonException { | |
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17 StringBuilder sb = new StringBuilder(); |
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18 new JsonToString().toString(obj,sb,0); |
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19 sb.append('\n'); |
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20 return sb.toString(); |
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21 } |
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22 |
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23 public static String toCompressedString(Object obj) throws JsonException { |
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24 StringBuilder sb = new StringBuilder(); |
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25 JsonToString jts = new JsonToString() { |
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26 void indent(StringBuilder sb,int indented) {} |
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27 }; |
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28 jts.toString(obj,sb,0); |
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29 return sb.toString(); |
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30 } |
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31 |
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32 private void toString(Object obj,StringBuilder sb,int indented) throws JsonException { |
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33 if( obj == null || obj instanceof Boolean || obj instanceof Number ) { |
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34 sb.append(obj); |
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35 return; |
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36 } |
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37 if( obj instanceof String ) { |
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38 toString((String)obj,sb); |
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39 return; |
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40 } |
1113 | 41 if( obj instanceof List ) { |
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42 toString((List)obj,sb,indented); |
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43 return; |
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44 } |
1113 | 45 if( obj instanceof Map ) { |
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46 toString((Map)obj,sb,indented); |
1113 | 47 return; |
48 } | |
49 throw new JsonException("can't handle type "+obj.getClass().getName()); | |
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50 } |
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51 |
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52 private void toString(final String s,StringBuilder sb) { |
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53 sb.append('"'); |
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54 for( int i=0; i<s.length(); i++ ) { |
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55 char c = s.charAt(i); |
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56 switch(c) { |
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57 case '"': |
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58 sb.append("\\\""); |
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59 break; |
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60 case '\\': |
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61 sb.append("\\\\"); |
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62 break; |
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63 case '\b': |
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64 sb.append("\\b"); |
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65 break; |
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66 case '\f': |
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67 sb.append("\\f"); |
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68 break; |
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69 case '\n': |
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70 sb.append("\\n"); |
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71 break; |
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72 case '\r': |
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73 sb.append("\\r"); |
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74 break; |
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75 case '\t': |
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76 sb.append("\\t"); |
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77 break; |
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78 default: |
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79 sb.append(c); |
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80 } |
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81 } |
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82 sb.append('"'); |
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83 } |
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84 |
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85 private void toString(List list,StringBuilder sb,int indented) { |
1116 | 86 sb.append('['); |
87 if( !list.isEmpty() ) { | |
88 indent(sb,indented+1); | |
89 toString(list.get(0),sb,indented+1); | |
90 for( int i=1; i<list.size(); i++ ) { | |
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91 sb.append(", "); |
1116 | 92 toString(list.get(i),sb,indented+1); |
93 } | |
94 indent(sb,indented); | |
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95 } |
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96 sb.append(']'); |
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97 return; |
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98 } |
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99 |
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100 private void toString(Map map,StringBuilder sb,int indented) throws JsonException { |
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101 sb.append('{'); |
1116 | 102 if( !map.isEmpty() ) { |
103 Iterator<Map.Entry> i = map.entrySet().iterator(); | |
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104 indent(sb,indented+1); |
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105 toString(i.next(),sb,indented+1); |
1116 | 106 while( i.hasNext() ) { |
107 sb.append(','); | |
108 indent(sb,indented+1); | |
109 toString(i.next(),sb,indented+1); | |
110 } | |
111 indent(sb,indented); | |
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112 } |
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113 sb.append('}'); |
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114 } |
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115 |
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116 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException { |
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117 Object key = entry.getKey(); |
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118 if( !(key instanceof String) ) |
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119 throw new JsonException("table keys must be strings"); |
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120 toString((String)key,sb); |
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121 sb.append(": "); |
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122 toString(entry.getValue(),sb,indented); |
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123 } |
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124 |
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125 void indent(StringBuilder sb,int indented) { |
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126 sb.append('\n'); |
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127 for( int i=0; i<indented; i++ ) { |
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128 sb.append('\t'); |
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129 } |
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130 } |
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131 |
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132 private JsonToString() {} |
720 | 133 } |