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annotate src/luan/lib/json/JsonToString.java @ 1113:22652f4020fb

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add JsonToString
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 02 Aug 2017 19:00:24 -0600
parents src/luan/modules/parsers/Json.java@490f77bb2ad1
children 809d74db1415
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package luan.lib.json;
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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);
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19 return sb.toString();
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20 }
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21
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22 private static void toString(Object obj,StringBuilder sb) throws JsonException {
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23 if( obj == null || obj instanceof Boolean || obj instanceof Number ) {
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24 sb.append(obj);
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25 return;
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26 }
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27 if( obj instanceof String ) {
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28 toString((String)obj,sb);
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29 return;
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30 }
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31 if( obj instanceof List ) {
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32 toString((List)obj,sb);
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33 return;
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34 }
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35 if( obj instanceof Map ) {
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36 toString((Map)obj,sb);
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37 return;
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38 }
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39 throw new JsonException("can't handle type "+obj.getClass().getName());
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40 }
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41
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42 private static void toString(final String s,StringBuilder sb) {
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43 sb.append('"');
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44 for( int i=0; i<s.length(); i++ ) {
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45 char c = s.charAt(i);
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46 switch(c) {
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47 case '"':
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48 sb.append("\\\"");
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49 break;
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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 '\b':
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54 sb.append("\\b");
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55 break;
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56 case '\f':
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57 sb.append("\\f");
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58 break;
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59 case '\n':
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60 sb.append("\\n");
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61 break;
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62 case '\r':
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63 sb.append("\\r");
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64 break;
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65 case '\t':
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66 sb.append("\\t");
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67 break;
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68 default:
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69 sb.append(c);
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70 }
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71 }
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72 sb.append('"');
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73 }
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75 private static void toString(List list,StringBuilder sb) {
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76 if( list.isEmpty() ) {
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77 sb.append("{}");
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78 return;
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79 }
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80 sb.append('[');
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81 toString(list.get(0),sb);
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82 for( int i=1; i<list.size(); i++ ) {
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83 sb.append(',');
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84 toString(list.get(i),sb);
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85 }
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86 sb.append(']');
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87 return;
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88 }
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90 private static void toString(Map map,StringBuilder sb) throws JsonException {
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91 sb.append('{');
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92 Iterator<Map.Entry> i = map.entrySet().iterator();
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93 toString(i.next(),sb);
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94 while( i.hasNext() ) {
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95 sb.append(',');
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96 toString(i.next(),sb);
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97 }
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98 sb.append('}');
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99 }
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100
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101 private static void toString(Map.Entry entry,StringBuilder sb) throws JsonException {
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102 Object key = entry.getKey();
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103 if( !(key instanceof String) )
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104 throw new JsonException("table keys must be strings");
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105 toString((String)key,sb);
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106 sb.append(':');
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107 toString(entry.getValue(),sb);
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108 }
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109
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110 }