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annotate src/goodjava/json/JsonToString.java @ 2021:b8e5d53c4fc9

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 20 Oct 2025 14:45:27 -0600
parents e4440c286af6
children
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rev   line source
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1 package goodjava.json;
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2
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3 import java.util.List;
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4 import java.util.Map;
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5 import java.util.Iterator;
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6
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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
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11 public static final class JsonException extends RuntimeException {
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12 private JsonException(String msg) {
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13 super(msg);
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14 }
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15 }
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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 }
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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 }
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36 if( obj instanceof Map ) {
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37 toString((Map)obj,sb,indented);
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38 return;
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39 }
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40 throw new JsonException("can't handle type "+obj.getClass().getName());
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41 }
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42
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43 private static void toString(final String s,StringBuilder sb) {
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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;
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51 case '\\':
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52 sb.append("\\\\");
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53 break;
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54 case '\b':
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55 sb.append("\\b");
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56 break;
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57 case '\f':
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58 sb.append("\\f");
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59 break;
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60 case '\n':
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61 sb.append("\\n");
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62 break;
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63 case '\r':
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64 sb.append("\\r");
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65 break;
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66 case '\t':
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67 sb.append("\\t");
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68 break;
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69 case 0:
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70 sb.append("\\u0000");
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71 break;
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72 default:
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73 sb.append(c);
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74 }
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75 }
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76 sb.append('"');
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77 }
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78
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79 public static String javascriptEncode(String s) {
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80 StringBuilder sb = new StringBuilder();
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81 for( int i=0; i<s.length(); i++ ) {
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82 char c = s.charAt(i);
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83 switch(c) {
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84 case '"':
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85 sb.append("\\\"");
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86 break;
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87 case '\'': // added for javascript
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88 sb.append("\\'");
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89 break;
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90 case '\\':
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91 sb.append("\\\\");
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92 break;
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93 case '\b':
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94 sb.append("\\b");
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95 break;
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96 case '\f':
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97 sb.append("\\f");
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98 break;
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99 case '\n':
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100 sb.append("\\n");
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101 break;
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102 case '\r':
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103 sb.append("\\r");
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104 break;
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105 case '\t':
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106 sb.append("\\t");
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107 break;
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108 default:
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109 sb.append(c);
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110 }
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111 }
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112 return sb.toString();
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113 }
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114
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115 private void toString(List list,StringBuilder sb,int indented) {
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116 sb.append('[');
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117 if( !list.isEmpty() ) {
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118 indent(sb,indented+1);
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119 toString(list.get(0),sb,indented+1);
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120 final int n = list.size();
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121 for( int i=1; i<n; i++ ) {
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122 sb.append(',');
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123 indent(sb,indented+1);
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124 toString(list.get(i),sb,indented+1);
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125 }
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126 indent(sb,indented);
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127 }
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128 sb.append(']');
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129 return;
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130 }
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131
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132 private void toString(Map map,StringBuilder sb,int indented) throws JsonException {
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133 sb.append('{');
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134 if( !map.isEmpty() ) {
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135 Iterator<Map.Entry> i = map.entrySet().iterator();
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136 indent(sb,indented+1);
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137 toString(i.next(),sb,indented+1);
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138 while( i.hasNext() ) {
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139 sb.append(',');
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140 indent(sb,indented+1);
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141 toString(i.next(),sb,indented+1);
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142 }
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143 indent(sb,indented);
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144 }
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145 sb.append('}');
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146 }
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147
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148 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException {
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149 Object key = entry.getKey();
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150 if( !(key instanceof String) )
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151 throw new JsonException("table keys must be strings but got "+key.getClass().getSimpleName()+" ("+key+"="+entry.getValue()+")");
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152 toString((String)key,sb);
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153 sb.append( compressed ? ":" : ": " );
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154 toString(entry.getValue(),sb,indented);
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155 }
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156
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157 private void indent(StringBuilder sb,int indented) {
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158 if( compressed )
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159 return;
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Franklin Schmidt <fschmidt@gmail.com>
parents: 1116
diff changeset
160 sb.append('\n');
9a1aa6fc0b4e remove json_pretty_string and make json_string somewhat pretty
Franklin Schmidt <fschmidt@gmail.com>
parents: 1116
diff changeset
161 for( int i=0; i<indented; i++ ) {
9a1aa6fc0b4e remove json_pretty_string and make json_string somewhat pretty
Franklin Schmidt <fschmidt@gmail.com>
parents: 1116
diff changeset
162 sb.append('\t');
9a1aa6fc0b4e remove json_pretty_string and make json_string somewhat pretty
Franklin Schmidt <fschmidt@gmail.com>
parents: 1116
diff changeset
163 }
9a1aa6fc0b4e remove json_pretty_string and make json_string somewhat pretty
Franklin Schmidt <fschmidt@gmail.com>
parents: 1116
diff changeset
164 }
1115
809d74db1415 add json_pretty_string
Franklin Schmidt <fschmidt@gmail.com>
parents: 1113
diff changeset
165
720
bdd766df1c17 add json parser
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
166 }