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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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3
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4 namespace Implab.Formats.JSON {
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5 class JSONGrammar : Grammar<JSONGrammar> {
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6 public enum TokenType {
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7 None,
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8 BeginObject,
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9 EndObject,
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10 BeginArray,
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11 EndArray,
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12 String,
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13 Number,
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14 Literal,
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15 NameSeparator,
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16 ValueSeparator,
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17
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18 StringBound,
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19 EscapedChar,
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20 UnescapedChar,
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21 EscapedUnicode,
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22
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23 Minus,
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24 Plus,
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25 Sign,
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26 Integer,
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27 Dot,
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28 Exp
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29 }
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30
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31 readonly CDFADefinition m_jsonDFA;
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32 readonly CDFADefinition m_stringDFA;
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33
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34 public JSONGrammar() {
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35 DefineAlphabet(Enumerable.Range(0, 0x20).Select(x => (char)x));
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36 var hexDigit = SymbolRangeToken('a','f').Or(SymbolRangeToken('A','F')).Or(SymbolRangeToken('0','9'));
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37 var digit9 = SymbolRangeToken('1', '9');
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38 var zero = SymbolToken('0');
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39 var digit = zero.Or(digit9);
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40 var dot = SymbolToken('.');
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41 var minus = SymbolToken('-');
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42 var sign = SymbolSetToken('-', '+');
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43 var expSign = SymbolSetToken('e', 'E');
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44 var letters = SymbolRangeToken('a', 'z');
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45 var integer = zero.Or(digit9.Cat(digit.EClosure()));
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46 var frac = dot.Cat(digit.Closure());
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47 var exp = expSign.Cat(sign.Optional()).Cat(digit.Closure());
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48 var quote = SymbolToken('"');
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49 var backSlash = SymbolToken('\\');
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50 var specialEscapeChars = SymbolSetToken('\\', '"', '/', 'b', 'f', 't', 'n', 'r');
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51 var unicodeEspace = SymbolToken('u').Cat(hexDigit.Repeat(4));
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52 var whitespace = SymbolSetToken('\n', '\r', '\t', ' ').EClosure();
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53 var beginObject = whitespace.Cat(SymbolToken('{')).Cat(whitespace);
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54 var endObject = whitespace.Cat(SymbolToken('}')).Cat(whitespace);
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55 var beginArray = whitespace.Cat(SymbolToken('[')).Cat(whitespace);
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56 var endArray = whitespace.Cat(SymbolToken(']')).Cat(whitespace);
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57 var nameSep = whitespace.Cat(SymbolToken(':')).Cat(whitespace);
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58 var valueSep = whitespace.Cat(SymbolToken(',')).Cat(whitespace);
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59
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60 var number = minus.Optional().Cat(integer).Cat(frac.Optional()).Cat(exp.Optional());
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61 var literal = letters.Closure();
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62 var unescaped = SymbolTokenExcept(Enumerable.Range(0, 0x20).Union(new int[] { '\\', '"' }).Select(x => (char)x));
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63
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64 var jsonExpression =
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65 number.Tag(TokenType.Number)
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66 .Or(literal.Tag(TokenType.Literal))
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67 .Or(quote.Tag(TokenType.StringBound))
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68 .Or(beginObject.Tag(TokenType.BeginObject))
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69 .Or(endObject.Tag(TokenType.EndObject))
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70 .Or(beginArray.Tag(TokenType.BeginArray))
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71 .Or(endArray.Tag(TokenType.EndArray))
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72 .Or(nameSep.Tag(TokenType.NameSeparator))
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73 .Or(valueSep.Tag(TokenType.ValueSeparator));
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74
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75
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76 var jsonStringExpression =
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77 quote.Tag(TokenType.StringBound)
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78 .Or(backSlash.Cat(specialEscapeChars).Tag(TokenType.EscapedChar))
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79 .Or(backSlash.Cat(unicodeEspace).Tag(TokenType.EscapedUnicode))
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80 .Or(unescaped.Closure().Tag(TokenType.UnescapedChar));
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81
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82
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83 m_jsonDFA = BuildDFA(jsonExpression);
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84 m_stringDFA = BuildDFA(jsonStringExpression);
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85 }
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86
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87 public CDFADefinition JsonDFA {
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88 get {
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89 return m_jsonDFA;
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90 }
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91 }
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92
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93 public CDFADefinition JsonStringDFA {
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94 get {
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95 return m_stringDFA;
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96 }
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97 }
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98 }
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99 }
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