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annotate src/luan/lib/json/JsonToString.java @ 1117:9a1aa6fc0b4e

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remove json_pretty_string and make json_string somewhat pretty
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 04 Aug 2017 11:15:53 -0600
parents 633ca24d4d6e
children b70102bab110
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 final 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 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 private static 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 default:
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70 sb.append(c);
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71 }
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72 }
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73 sb.append('"');
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74 }
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75
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76 private static void toString(List list,StringBuilder sb,int indented) {
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77 sb.append('[');
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78 if( !list.isEmpty() ) {
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79 indent(sb,indented+1);
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80 toString(list.get(0),sb,indented+1);
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81 for( int i=1; i<list.size(); i++ ) {
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82 sb.append(", ");
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83 toString(list.get(i),sb,indented+1);
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84 }
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85 indent(sb,indented);
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86 }
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87 sb.append(']');
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88 return;
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89 }
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90
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91 private static void toString(Map map,StringBuilder sb,int indented) throws JsonException {
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92 sb.append('{');
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93 if( !map.isEmpty() ) {
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94 Iterator<Map.Entry> i = map.entrySet().iterator();
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95 indent(sb,indented+1);
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96 toString(i.next(),sb,indented+1);
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97 while( i.hasNext() ) {
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98 sb.append(',');
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99 indent(sb,indented+1);
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100 toString(i.next(),sb,indented+1);
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101 }
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102 indent(sb,indented);
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103 }
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104 sb.append('}');
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105 }
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106
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107 private static void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException {
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108 Object key = entry.getKey();
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109 if( !(key instanceof String) )
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110 throw new JsonException("table keys must be strings");
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111 toString((String)key,sb);
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112 sb.append(": ");
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113 toString(entry.getValue(),sb,indented);
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114 }
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115
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116 private static void indent(StringBuilder sb,int indented) {
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117 sb.append('\n');
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118 for( int i=0; i<indented; i++ ) {
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119 sb.append('\t');
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120 }
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121 }
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122
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123 private JsonToString() {} // never
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124 }