Mercurial Hosting > luan
annotate src/goodjava/json/JsonToString.java @ 1625:57c8baadb357
handle UnsupportedClassVersionError
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sun, 05 Sep 2021 12:32:27 -0600 |
parents | 99a8ac891914 |
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1 package goodjava.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 final class JsonToString { |
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9 public boolean compressed = false; |
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10 |
1113 | 11 public static final class JsonException extends RuntimeException { |
12 private JsonException(String msg) { | |
13 super(msg); | |
14 } | |
15 } | |
16 | |
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17 public String toString(Object obj) throws JsonException { |
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18 StringBuilder sb = new StringBuilder(); |
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19 toString(obj,sb,0); |
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20 return sb.toString(); |
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21 } |
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22 |
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23 private void toString(Object obj,StringBuilder sb,int indented) throws JsonException { |
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24 if( obj == null || obj instanceof Boolean || obj instanceof Number ) { |
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25 sb.append(obj); |
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26 return; |
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27 } |
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28 if( obj instanceof String ) { |
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29 toString((String)obj,sb); |
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30 return; |
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31 } |
1113 | 32 if( obj instanceof List ) { |
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33 toString((List)obj,sb,indented); |
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34 return; |
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35 } |
1113 | 36 if( obj instanceof Map ) { |
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37 toString((Map)obj,sb,indented); |
1113 | 38 return; |
39 } | |
40 throw new JsonException("can't handle type "+obj.getClass().getName()); | |
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41 } |
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42 |
1295 | 43 private static void toString(final String s,StringBuilder sb) { |
44 sb.append('"'); | |
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45 for( int i=0; i<s.length(); i++ ) { |
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46 char c = s.charAt(i); |
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47 switch(c) { |
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48 case '"': |
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49 sb.append("\\\""); |
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50 break; |
1307 | 51 case '\\': |
52 sb.append("\\\\"); | |
53 break; | |
54 case '\b': | |
55 sb.append("\\b"); | |
56 break; | |
57 case '\f': | |
58 sb.append("\\f"); | |
59 break; | |
60 case '\n': | |
61 sb.append("\\n"); | |
62 break; | |
63 case '\r': | |
64 sb.append("\\r"); | |
65 break; | |
66 case '\t': | |
67 sb.append("\\t"); | |
68 break; | |
69 default: | |
70 sb.append(c); | |
71 } | |
72 } | |
73 sb.append('"'); | |
74 } | |
75 | |
76 public static String javascriptEncode(String s) { | |
77 StringBuilder sb = new StringBuilder(); | |
78 for( int i=0; i<s.length(); i++ ) { | |
79 char c = s.charAt(i); | |
80 switch(c) { | |
81 case '"': | |
82 sb.append("\\\""); | |
83 break; | |
84 case '\'': // added for javascript | |
1295 | 85 sb.append("\\'"); |
86 break; | |
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87 case '\\': |
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88 sb.append("\\\\"); |
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89 break; |
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90 case '\b': |
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91 sb.append("\\b"); |
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92 break; |
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93 case '\f': |
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94 sb.append("\\f"); |
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95 break; |
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96 case '\n': |
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97 sb.append("\\n"); |
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98 break; |
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99 case '\r': |
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100 sb.append("\\r"); |
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101 break; |
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102 case '\t': |
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103 sb.append("\\t"); |
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104 break; |
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105 default: |
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106 sb.append(c); |
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107 } |
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108 } |
1307 | 109 return sb.toString(); |
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110 } |
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111 |
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112 private void toString(List list,StringBuilder sb,int indented) { |
1116 | 113 sb.append('['); |
114 if( !list.isEmpty() ) { | |
115 indent(sb,indented+1); | |
116 toString(list.get(0),sb,indented+1); | |
1485 | 117 final int n = list.size(); |
118 for( int i=1; i<n; i++ ) { | |
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119 sb.append(','); |
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120 indent(sb,indented+1); |
1116 | 121 toString(list.get(i),sb,indented+1); |
122 } | |
123 indent(sb,indented); | |
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124 } |
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125 sb.append(']'); |
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126 return; |
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127 } |
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128 |
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129 private void toString(Map map,StringBuilder sb,int indented) throws JsonException { |
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130 sb.append('{'); |
1116 | 131 if( !map.isEmpty() ) { |
132 Iterator<Map.Entry> i = map.entrySet().iterator(); | |
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133 indent(sb,indented+1); |
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134 toString(i.next(),sb,indented+1); |
1116 | 135 while( i.hasNext() ) { |
136 sb.append(','); | |
137 indent(sb,indented+1); | |
138 toString(i.next(),sb,indented+1); | |
139 } | |
140 indent(sb,indented); | |
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141 } |
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142 sb.append('}'); |
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143 } |
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144 |
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145 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException { |
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146 Object key = entry.getKey(); |
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147 if( !(key instanceof String) ) |
1477 | 148 throw new JsonException("table keys must be strings but got "+key.getClass().getSimpleName()+" ("+key+"="+entry.getValue()+")"); |
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149 toString((String)key,sb); |
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150 sb.append( compressed ? ":" : ": " ); |
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151 toString(entry.getValue(),sb,indented); |
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152 } |
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153 |
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154 private void indent(StringBuilder sb,int indented) { |
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155 if( compressed ) |
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156 return; |
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157 sb.append('\n'); |
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158 for( int i=0; i<indented; i++ ) { |
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159 sb.append('\t'); |
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160 } |
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161 } |
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162 |
720 | 163 } |