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annotate src/luan/modules/parsers/Json.java @ 1112:490f77bb2ad1

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add JsonParser
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 02 Aug 2017 17:37:59 -0600
parents 88b5b81cad4a
children
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1 package luan.modules.parsers;
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2
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import java.util.Map;
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6 import java.util.LinkedHashMap;
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7 import java.util.Iterator;
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8 import luan.LuanTable;
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9 import luan.LuanException;
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10 import luan.lib.parser.Parser;
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11 import luan.lib.parser.ParseException;
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12
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13
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14 public final class Json {
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15
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16 public static String toString(Object obj) throws LuanException {
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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 LuanException {
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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 LuanTable ) {
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32 toString((LuanTable)obj,sb);
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33 return;
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34 }
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35 throw new LuanException("can't handle type "+obj.getClass().getName());
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36 }
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37
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38 private static void toString(final String s,StringBuilder sb) {
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39 sb.append('"');
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40 for( int i=0; i<s.length(); i++ ) {
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41 char c = s.charAt(i);
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42 switch(c) {
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43 case '"':
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44 sb.append("\\\"");
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45 break;
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46 case '\\':
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47 sb.append("\\\\");
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48 break;
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49 case '\b':
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50 sb.append("\\b");
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51 break;
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52 case '\f':
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53 sb.append("\\f");
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54 break;
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55 case '\n':
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56 sb.append("\\n");
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57 break;
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58 case '\r':
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59 sb.append("\\r");
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60 break;
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61 case '\t':
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62 sb.append("\\t");
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63 break;
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64 default:
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65 sb.append(c);
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66 }
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67 }
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68 sb.append('"');
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69 }
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70
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71 private static void toString(LuanTable t,StringBuilder sb) throws LuanException {
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72 if( t.isList() ) {
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73 final List list = t.asList();
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74 if( list.isEmpty() ) {
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75 sb.append("{}");
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76 return;
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77 }
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78 sb.append('[');
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79 toString(list.get(0),sb);
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80 for( int i=1; i<list.size(); i++ ) {
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81 sb.append(',');
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82 toString(list.get(i),sb);
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83 }
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84 sb.append(']');
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85 return;
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86 }
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87 sb.append('{');
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88 Iterator<Map.Entry<Object,Object>> i = t.rawIterator();
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89 toString(i.next(),sb);
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90 while( i.hasNext() ) {
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91 sb.append(',');
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92 toString(i.next(),sb);
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93 }
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94 sb.append('}');
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95 }
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96
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97 private static void toString(Map.Entry<Object,Object> entry,StringBuilder sb) throws LuanException {
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98 Object key = entry.getKey();
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99 if( !(key instanceof String) )
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100 throw new LuanException("table keys must be strings");
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101 toString((String)key,sb);
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102 sb.append(':');
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103 toString(entry.getValue(),sb);
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104 }
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105
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106 }