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annotate src/goodjava/json/JsonToString.java @ 1541:dc23c96f5021

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 13 Sep 2020 15:50:52 -0600
parents f989778ca9e1
children 99a8ac891914
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 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 }
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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 }
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38 if( obj instanceof Map ) {
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39 toString((Map)obj,sb,indented);
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40 return;
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41 }
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42 throw new JsonException("can't handle type "+obj.getClass().getName());
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43 }
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44
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45 private static void toString(final String s,StringBuilder sb) {
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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;
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53 case '\\':
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54 sb.append("\\\\");
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55 break;
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56 case '\b':
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57 sb.append("\\b");
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58 break;
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59 case '\f':
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60 sb.append("\\f");
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61 break;
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62 case '\n':
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63 sb.append("\\n");
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64 break;
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65 case '\r':
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66 sb.append("\\r");
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67 break;
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68 case '\t':
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69 sb.append("\\t");
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70 break;
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71 default:
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72 sb.append(c);
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73 }
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74 }
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75 sb.append('"');
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76 }
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77
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78 public static String javascriptEncode(String s) {
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79 StringBuilder sb = new StringBuilder();
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80 for( int i=0; i<s.length(); i++ ) {
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81 char c = s.charAt(i);
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82 switch(c) {
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83 case '"':
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84 sb.append("\\\"");
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85 break;
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86 case '\'': // added for javascript
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87 sb.append("\\'");
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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 }
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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) {
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115 sb.append('[');
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116 if( !list.isEmpty() ) {
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117 indent(sb,indented+1);
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118 toString(list.get(0),sb,indented+1);
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119 final int n = list.size();
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120 for( int i=1; i<n; i++ ) {
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121 sb.append(',');
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122 indent(sb,indented+1);
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123 toString(list.get(i),sb,indented+1);
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124 }
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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('{');
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133 if( !map.isEmpty() ) {
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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);
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137 while( i.hasNext() ) {
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138 sb.append(',');
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139 indent(sb,indented+1);
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140 toString(i.next(),sb,indented+1);
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141 }
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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) )
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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');
9a1aa6fc0b4e remove json_pretty_string and make json_string somewhat pretty
Franklin Schmidt <fschmidt@gmail.com>
parents: 1116
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160 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
161 sb.append('\t');
9a1aa6fc0b4e remove json_pretty_string and make json_string somewhat pretty
Franklin Schmidt <fschmidt@gmail.com>
parents: 1116
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162 }
9a1aa6fc0b4e remove json_pretty_string and make json_string somewhat pretty
Franklin Schmidt <fschmidt@gmail.com>
parents: 1116
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163 }
1115
809d74db1415 add json_pretty_string
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parents: 1113
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164
720
bdd766df1c17 add json parser
Franklin Schmidt <fschmidt@gmail.com>
parents:
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165 }