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annotate src/luan/lib/json/JsonToString.java @ 1295:9dca1e912658

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improve web shell
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 10 Jan 2019 21:42:11 -0700
parents b70102bab110
children 6c8ceca4a10b
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1 package luan.lib.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 class JsonToString {
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9
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10 public static final class JsonException extends RuntimeException {
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11 private JsonException(String msg) {
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12 super(msg);
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13 }
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14 }
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16 public static String toString(Object obj) throws JsonException {
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17 StringBuilder sb = new StringBuilder();
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18 new JsonToString().toString(obj,sb,0);
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19 sb.append('\n');
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20 return sb.toString();
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21 }
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22
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23 public static String toCompressedString(Object obj) throws JsonException {
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24 StringBuilder sb = new StringBuilder();
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25 JsonToString jts = new JsonToString() {
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26 void indent(StringBuilder sb,int indented) {}
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27 };
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28 jts.toString(obj,sb,0);
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29 return sb.toString();
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30 }
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31
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32 public static String encodeString(String s) {
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33 StringBuilder sb = new StringBuilder();
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34 encodeString(s,sb);
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35 return sb.toString();
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36 }
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37
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38 private void toString(Object obj,StringBuilder sb,int indented) throws JsonException {
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39 if( obj == null || obj instanceof Boolean || obj instanceof Number ) {
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40 sb.append(obj);
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41 return;
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42 }
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43 if( obj instanceof String ) {
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44 toString((String)obj,sb);
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45 return;
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46 }
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47 if( obj instanceof List ) {
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48 toString((List)obj,sb,indented);
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49 return;
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50 }
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51 if( obj instanceof Map ) {
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52 toString((Map)obj,sb,indented);
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53 return;
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54 }
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55 throw new JsonException("can't handle type "+obj.getClass().getName());
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56 }
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57
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58 private static void toString(final String s,StringBuilder sb) {
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59 sb.append('"');
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60 encodeString(s,sb);
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61 sb.append('"');
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62 }
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63
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64 private static void encodeString(final String s,StringBuilder sb) {
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65 for( int i=0; i<s.length(); i++ ) {
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66 char c = s.charAt(i);
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67 switch(c) {
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68 case '"':
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69 sb.append("\\\"");
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70 break;
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71 case '\'':
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72 sb.append("\\'");
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73 break;
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74 case '\\':
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75 sb.append("\\\\");
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76 break;
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77 case '\b':
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78 sb.append("\\b");
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79 break;
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80 case '\f':
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81 sb.append("\\f");
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82 break;
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83 case '\n':
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84 sb.append("\\n");
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85 break;
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86 case '\r':
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87 sb.append("\\r");
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88 break;
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89 case '\t':
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90 sb.append("\\t");
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91 break;
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92 default:
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93 sb.append(c);
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94 }
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95 }
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96 }
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97
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98 private void toString(List list,StringBuilder sb,int indented) {
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99 sb.append('[');
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100 if( !list.isEmpty() ) {
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101 indent(sb,indented+1);
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102 toString(list.get(0),sb,indented+1);
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103 for( int i=1; i<list.size(); i++ ) {
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104 sb.append(", ");
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105 toString(list.get(i),sb,indented+1);
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106 }
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107 indent(sb,indented);
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108 }
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109 sb.append(']');
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110 return;
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111 }
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112
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113 private void toString(Map map,StringBuilder sb,int indented) throws JsonException {
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114 sb.append('{');
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115 if( !map.isEmpty() ) {
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116 Iterator<Map.Entry> i = map.entrySet().iterator();
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117 indent(sb,indented+1);
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118 toString(i.next(),sb,indented+1);
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119 while( i.hasNext() ) {
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120 sb.append(',');
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121 indent(sb,indented+1);
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122 toString(i.next(),sb,indented+1);
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123 }
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124 indent(sb,indented);
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125 }
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126 sb.append('}');
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127 }
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128
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129 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException {
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130 Object key = entry.getKey();
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131 if( !(key instanceof String) )
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132 throw new JsonException("table keys must be strings");
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133 toString((String)key,sb);
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134 sb.append(": ");
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135 toString(entry.getValue(),sb,indented);
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136 }
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137
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138 void indent(StringBuilder sb,int indented) {
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139 sb.append('\n');
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140 for( int i=0; i<indented; i++ ) {
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141 sb.append('\t');
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142 }
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143 }
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144
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145 private JsonToString() {}
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146 }