Mercurial Hosting > luan
annotate src/luan/lib/json/JsonToString.java @ 1116:633ca24d4d6e
fix JsonToString
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 04 Aug 2017 11:06:08 -0600 |
parents | 809d74db1415 |
children | 9a1aa6fc0b4e |
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 | |
1113 | 8 public final 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 toString(obj,sb); |
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19 return sb.toString(); |
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20 } |
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21 |
1113 | 22 private static void toString(Object obj,StringBuilder sb) throws JsonException { |
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23 if( obj == null || obj instanceof Boolean || obj instanceof Number ) { |
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24 sb.append(obj); |
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25 return; |
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26 } |
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27 if( obj instanceof String ) { |
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28 toString((String)obj,sb); |
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29 return; |
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30 } |
1113 | 31 if( obj instanceof List ) { |
32 toString((List)obj,sb); | |
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33 return; |
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34 } |
1113 | 35 if( obj instanceof Map ) { |
36 toString((Map)obj,sb); | |
37 return; | |
38 } | |
39 throw new JsonException("can't handle type "+obj.getClass().getName()); | |
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40 } |
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41 |
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42 private static void toString(final String s,StringBuilder sb) { |
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43 sb.append('"'); |
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44 for( int i=0; i<s.length(); i++ ) { |
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45 char c = s.charAt(i); |
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46 switch(c) { |
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47 case '"': |
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48 sb.append("\\\""); |
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49 break; |
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50 case '\\': |
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51 sb.append("\\\\"); |
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52 break; |
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53 case '\b': |
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54 sb.append("\\b"); |
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55 break; |
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56 case '\f': |
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57 sb.append("\\f"); |
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58 break; |
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59 case '\n': |
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60 sb.append("\\n"); |
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61 break; |
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62 case '\r': |
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63 sb.append("\\r"); |
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64 break; |
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65 case '\t': |
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66 sb.append("\\t"); |
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67 break; |
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68 default: |
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69 sb.append(c); |
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70 } |
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71 } |
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72 sb.append('"'); |
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73 } |
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74 |
1113 | 75 private static void toString(List list,StringBuilder sb) { |
76 sb.append('['); | |
1116 | 77 if( !list.isEmpty() ) { |
78 toString(list.get(0),sb); | |
79 for( int i=1; i<list.size(); i++ ) { | |
80 sb.append(','); | |
81 toString(list.get(i),sb); | |
82 } | |
1113 | 83 } |
84 sb.append(']'); | |
85 return; | |
86 } | |
87 | |
88 private static void toString(Map map,StringBuilder sb) throws JsonException { | |
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89 sb.append('{'); |
1116 | 90 if( !map.isEmpty() ) { |
91 Iterator<Map.Entry> i = map.entrySet().iterator(); | |
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92 toString(i.next(),sb); |
1116 | 93 while( i.hasNext() ) { |
94 sb.append(','); | |
95 toString(i.next(),sb); | |
96 } | |
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97 } |
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98 sb.append('}'); |
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99 } |
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100 |
1113 | 101 private static void toString(Map.Entry entry,StringBuilder sb) throws JsonException { |
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102 Object key = entry.getKey(); |
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103 if( !(key instanceof String) ) |
1113 | 104 throw new JsonException("table keys must be strings"); |
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105 toString((String)key,sb); |
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106 sb.append(':'); |
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107 toString(entry.getValue(),sb); |
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108 } |
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109 |
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110 |
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111 public static String toPrettyString(Object obj) throws JsonException { |
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112 StringBuilder sb = new StringBuilder(); |
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113 toString(obj,sb,0); |
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114 sb.append('\n'); |
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115 return sb.toString(); |
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116 } |
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117 |
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118 private static void toString(Object obj,StringBuilder sb,int indented) throws JsonException { |
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119 if( obj instanceof List ) { |
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120 toString((List)obj,sb,indented); |
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121 return; |
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122 } |
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123 if( obj instanceof Map ) { |
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124 toString((Map)obj,sb,indented); |
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125 return; |
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126 } |
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127 toString(obj,sb); |
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128 } |
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129 |
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130 private static void indent(StringBuilder sb,int indented) { |
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131 sb.append('\n'); |
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132 for( int i=0; i<indented; i++ ) { |
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133 sb.append('\t'); |
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134 } |
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135 } |
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136 |
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137 private static void toString(List list,StringBuilder sb,int indented) { |
1116 | 138 sb.append('['); |
139 if( !list.isEmpty() ) { | |
140 indent(sb,indented+1); | |
141 toString(list.get(0),sb,indented+1); | |
142 for( int i=1; i<list.size(); i++ ) { | |
143 sb.append(','); | |
144 indent(sb,indented+1); | |
145 toString(list.get(i),sb,indented+1); | |
146 } | |
147 indent(sb,indented); | |
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148 } |
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149 sb.append(']'); |
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150 return; |
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151 } |
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152 |
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153 private static void toString(Map map,StringBuilder sb,int indented) throws JsonException { |
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154 sb.append('{'); |
1116 | 155 if( !map.isEmpty() ) { |
156 Iterator<Map.Entry> i = map.entrySet().iterator(); | |
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157 indent(sb,indented+1); |
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158 toString(i.next(),sb,indented+1); |
1116 | 159 while( i.hasNext() ) { |
160 sb.append(','); | |
161 indent(sb,indented+1); | |
162 toString(i.next(),sb,indented+1); | |
163 } | |
164 indent(sb,indented); | |
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165 } |
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166 sb.append('}'); |
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167 } |
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168 |
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169 private static void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException { |
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170 Object key = entry.getKey(); |
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171 if( !(key instanceof String) ) |
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172 throw new JsonException("table keys must be strings"); |
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173 toString((String)key,sb); |
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174 sb.append(": "); |
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175 toString(entry.getValue(),sb,indented); |
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176 } |
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177 |
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178 |
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179 private JsonToString() {} // never |
720 | 180 } |