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163
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1 using System.Linq;
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2 using Implab.Automaton.RegularExpressions;
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165
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3 using System;
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172
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4 using Implab.Automaton;
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163
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5
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6 namespace Implab.Formats.JSON {
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178
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7 class JSONGrammar : Grammar<char> {
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163
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8 public enum TokenType {
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9 None,
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10 BeginObject,
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11 EndObject,
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12 BeginArray,
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13 EndArray,
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14 String,
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15 Number,
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16 Literal,
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17 NameSeparator,
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18 ValueSeparator,
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19
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20 StringBound,
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21 EscapedChar,
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22 UnescapedChar,
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23 EscapedUnicode
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24 }
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25
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26 static Lazy<JSONGrammar> _instance = new Lazy<JSONGrammar>();
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27
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28 public static JSONGrammar Instance {
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29 get { return _instance.Value; }
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30 }
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31
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32 readonly ScannerContext<TokenType> m_jsonExpression;
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33 readonly ScannerContext<TokenType> m_stringExpression;
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34
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35 public JSONGrammar() {
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36 DefineAlphabet(Enumerable.Range(0, 0x20).Select(x => (char)x));
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37 var hexDigit = SymbolRangeToken('a','f').Or(SymbolRangeToken('A','F')).Or(SymbolRangeToken('0','9'));
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38 var digit9 = SymbolRangeToken('1', '9');
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39 var zero = SymbolToken('0');
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40 var digit = zero.Or(digit9);
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41 var dot = SymbolToken('.');
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42 var minus = SymbolToken('-');
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43 var sign = SymbolSetToken('-', '+');
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44 var expSign = SymbolSetToken('e', 'E');
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45 var letters = SymbolRangeToken('a', 'z');
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46 var integer = zero.Or(digit9.Cat(digit.EClosure()));
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47 var frac = dot.Cat(digit.Closure());
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48 var exp = expSign.Cat(sign.Optional()).Cat(digit.Closure());
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49 var quote = SymbolToken('"');
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50 var backSlash = SymbolToken('\\');
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51 var specialEscapeChars = SymbolSetToken('\\', '"', '/', 'b', 'f', 't', 'n', 'r');
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52 var unicodeEspace = SymbolToken('u').Cat(hexDigit.Repeat(4));
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53 var whitespace = SymbolSetToken('\n', '\r', '\t', ' ').EClosure();
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54 var beginObject = whitespace.Cat(SymbolToken('{')).Cat(whitespace);
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55 var endObject = whitespace.Cat(SymbolToken('}')).Cat(whitespace);
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56 var beginArray = whitespace.Cat(SymbolToken('[')).Cat(whitespace);
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57 var endArray = whitespace.Cat(SymbolToken(']')).Cat(whitespace);
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58 var nameSep = whitespace.Cat(SymbolToken(':')).Cat(whitespace);
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59 var valueSep = whitespace.Cat(SymbolToken(',')).Cat(whitespace);
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60
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61 var number = minus.Optional().Cat(integer).Cat(frac.Optional()).Cat(exp.Optional());
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62 var literal = letters.Closure();
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63 var unescaped = SymbolTokenExcept(Enumerable.Range(0, 0x20).Union(new int[] { '\\', '"' }).Select(x => (char)x));
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64
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65 var jsonExpression =
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66 number.Tag(TokenType.Number)
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67 .Or(literal.Tag(TokenType.Literal))
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68 .Or(quote.Tag(TokenType.StringBound))
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69 .Or(beginObject.Tag(TokenType.BeginObject))
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70 .Or(endObject.Tag(TokenType.EndObject))
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71 .Or(beginArray.Tag(TokenType.BeginArray))
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72 .Or(endArray.Tag(TokenType.EndArray))
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73 .Or(nameSep.Tag(TokenType.NameSeparator))
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74 .Or(valueSep.Tag(TokenType.ValueSeparator));
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75
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76
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77 var jsonStringExpression =
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78 quote.Tag(TokenType.StringBound)
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79 .Or(backSlash.Cat(specialEscapeChars).Tag(TokenType.EscapedChar))
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80 .Or(backSlash.Cat(unicodeEspace).Tag(TokenType.EscapedUnicode))
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81 .Or(unescaped.Closure().Tag(TokenType.UnescapedChar));
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82
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83
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84 m_jsonExpression = BuildScannerContext<TokenType>(jsonExpression);
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85 m_stringExpression = BuildScannerContext<TokenType>(jsonStringExpression);
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86
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87
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163
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88 }
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89
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178
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90 public ScannerContext<TokenType> JsonExpression {
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163
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91 get {
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92 return m_jsonExpression;
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93 }
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94 }
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95
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178
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96 public ScannerContext<TokenType> JsonStringExpression {
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163
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97 get {
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98 return m_stringExpression;
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99 }
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100 }
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101
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102 Token SymbolRangeToken(char start, char stop) {
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103 return SymbolToken(Enumerable.Range(start,stop - start).Cast<char>());
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104 }
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172
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105
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106 protected override IAlphabetBuilder<char> CreateAlphabet() {
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107 return new CharAlphabet();
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108 }
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109
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110 }
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111 }
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