Mercurial Hosting > luan
annotate src/goodjava/json/JsonToString.java @ 1581:dbf63bef4b86
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 11 Feb 2021 00:51:47 -0700 |
parents | f989778ca9e1 |
children | 99a8ac891914 |
rev | line source |
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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; |
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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 if( !compressed ) |
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21 sb.append('\n'); |
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22 return sb.toString(); |
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23 } |
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24 |
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25 private void toString(Object obj,StringBuilder sb,int indented) throws JsonException { |
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26 if( obj == null || obj instanceof Boolean || obj instanceof Number ) { |
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27 sb.append(obj); |
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28 return; |
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29 } |
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30 if( obj instanceof String ) { |
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31 toString((String)obj,sb); |
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32 return; |
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33 } |
1113 | 34 if( obj instanceof List ) { |
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35 toString((List)obj,sb,indented); |
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36 return; |
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37 } |
1113 | 38 if( obj instanceof Map ) { |
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39 toString((Map)obj,sb,indented); |
1113 | 40 return; |
41 } | |
42 throw new JsonException("can't handle type "+obj.getClass().getName()); | |
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43 } |
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44 |
1295 | 45 private static void toString(final String s,StringBuilder sb) { |
46 sb.append('"'); | |
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47 for( int i=0; i<s.length(); i++ ) { |
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48 char c = s.charAt(i); |
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49 switch(c) { |
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50 case '"': |
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51 sb.append("\\\""); |
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52 break; |
1307 | 53 case '\\': |
54 sb.append("\\\\"); | |
55 break; | |
56 case '\b': | |
57 sb.append("\\b"); | |
58 break; | |
59 case '\f': | |
60 sb.append("\\f"); | |
61 break; | |
62 case '\n': | |
63 sb.append("\\n"); | |
64 break; | |
65 case '\r': | |
66 sb.append("\\r"); | |
67 break; | |
68 case '\t': | |
69 sb.append("\\t"); | |
70 break; | |
71 default: | |
72 sb.append(c); | |
73 } | |
74 } | |
75 sb.append('"'); | |
76 } | |
77 | |
78 public static String javascriptEncode(String s) { | |
79 StringBuilder sb = new StringBuilder(); | |
80 for( int i=0; i<s.length(); i++ ) { | |
81 char c = s.charAt(i); | |
82 switch(c) { | |
83 case '"': | |
84 sb.append("\\\""); | |
85 break; | |
86 case '\'': // added for javascript | |
1295 | 87 sb.append("\\'"); |
88 break; | |
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89 case '\\': |
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90 sb.append("\\\\"); |
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91 break; |
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92 case '\b': |
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93 sb.append("\\b"); |
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94 break; |
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95 case '\f': |
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96 sb.append("\\f"); |
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97 break; |
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98 case '\n': |
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99 sb.append("\\n"); |
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100 break; |
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101 case '\r': |
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102 sb.append("\\r"); |
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103 break; |
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104 case '\t': |
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105 sb.append("\\t"); |
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106 break; |
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107 default: |
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108 sb.append(c); |
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109 } |
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110 } |
1307 | 111 return sb.toString(); |
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112 } |
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113 |
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114 private void toString(List list,StringBuilder sb,int indented) { |
1116 | 115 sb.append('['); |
116 if( !list.isEmpty() ) { | |
117 indent(sb,indented+1); | |
118 toString(list.get(0),sb,indented+1); | |
1485 | 119 final int n = list.size(); |
120 for( int i=1; i<n; i++ ) { | |
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121 sb.append(','); |
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122 indent(sb,indented+1); |
1116 | 123 toString(list.get(i),sb,indented+1); |
124 } | |
125 indent(sb,indented); | |
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126 } |
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127 sb.append(']'); |
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128 return; |
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129 } |
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130 |
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131 private void toString(Map map,StringBuilder sb,int indented) throws JsonException { |
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132 sb.append('{'); |
1116 | 133 if( !map.isEmpty() ) { |
134 Iterator<Map.Entry> i = map.entrySet().iterator(); | |
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135 indent(sb,indented+1); |
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136 toString(i.next(),sb,indented+1); |
1116 | 137 while( i.hasNext() ) { |
138 sb.append(','); | |
139 indent(sb,indented+1); | |
140 toString(i.next(),sb,indented+1); | |
141 } | |
142 indent(sb,indented); | |
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143 } |
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144 sb.append('}'); |
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145 } |
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146 |
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147 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException { |
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148 Object key = entry.getKey(); |
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149 if( !(key instanceof String) ) |
1477 | 150 throw new JsonException("table keys must be strings but got "+key.getClass().getSimpleName()+" ("+key+"="+entry.getValue()+")"); |
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151 toString((String)key,sb); |
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152 sb.append( compressed ? ":" : ": " ); |
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153 toString(entry.getValue(),sb,indented); |
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154 } |
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155 |
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156 private void indent(StringBuilder sb,int indented) { |
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157 if( compressed ) |
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158 return; |
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159 sb.append('\n'); |
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160 for( int i=0; i<indented; i++ ) { |
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161 sb.append('\t'); |
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162 } |
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163 } |
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164 |
720 | 165 } |