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1 using Implab.Parsing;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.Linq;
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5 using System.Text;
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6 using System.Threading.Tasks;
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7
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8 namespace Implab.JSON {
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9 internal class JSONGrammar : Grammar<JSONGrammar> {
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10 public enum TokenType : int{
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11 None,
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12 BeginObject,
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13 EndObject,
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14 BeginArray,
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15 EndArray,
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16 String,
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17 Number,
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18 Literal,
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19 NameSeparator,
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20 ValueSeparator,
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21
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22 StringBound,
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23 EscapedChar,
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24 UnescapedChar,
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25 EscapedUnicode,
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26
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27 Minus,
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28 Plus,
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29 Sign,
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30 Integer,
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31 Dot,
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32 Exp
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33 }
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34
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35 readonly CDFADefinition m_jsonDFA;
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36 readonly CDFADefinition m_stringDFA;
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37
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38 public JSONGrammar() {
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39 DefineAlphabet(Enumerable.Range(0, 0x20).Select(x => (char)x));
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40 var hexDigit = SymbolRangeToken('a','f').Or(SymbolRangeToken('A','F')).Or(SymbolRangeToken('0','9'));
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41 var digit9 = SymbolRangeToken('1', '9');
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42 var zero = SymbolToken('0');
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43 var digit = zero.Or(digit9);
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44 var dot = SymbolToken('.');
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45 var minus = SymbolToken('-');
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46 var sign = SymbolSetToken('-', '+');
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47 var expSign = SymbolSetToken('e', 'E');
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48 var letters = SymbolRangeToken('a', 'z');
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49 var integer = zero.Or(digit9.Cat(digit.EClosure()));
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50 var frac = dot.Cat(digit.Closure());
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51 var exp = expSign.Cat(sign.Optional()).Cat(digit.Closure());
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52 var quote = SymbolToken('"');
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53 var backSlash = SymbolToken('\\');
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54 var specialEscapeChars = SymbolSetToken('\\', '"', '/', 'b', 'f', 't', 'n', 'r');
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55 var unicodeEspace = SymbolToken('u').Cat(hexDigit.Repeat(4));
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56 var escape = backSlash.Cat(specialEscapeChars.Or(unicodeEspace));
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57 var whitespace = SymbolSetToken('\n', '\r', '\t', ' ').EClosure();
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58 var beginObject = whitespace.Cat(SymbolToken('{')).Cat(whitespace);
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59 var endObject = whitespace.Cat(SymbolToken('}')).Cat(whitespace);
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60 var beginArray = whitespace.Cat(SymbolToken('[')).Cat(whitespace);
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61 var endArray = whitespace.Cat(SymbolToken(']')).Cat(whitespace);
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62 var nameSep = whitespace.Cat(SymbolToken(':')).Cat(whitespace);
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63 var valueSep = whitespace.Cat(SymbolToken(',')).Cat(whitespace);
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64
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65 var number = minus.Optional().Cat(integer).Cat(frac.Optional()).Cat(exp.Optional());
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66 var literal = letters.Closure();
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67 var unescaped = SymbolTokenExcept(Enumerable.Range(0, 0x20).Union(new int[] { '\\', '"' }).Select(x => (char)x));
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68 var character = unescaped.Or(escape);
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69 var str = quote.Cat(character.EClosure()).Cat(quote);
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70
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71
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72 var jsonExpression =
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73 number.Tag(TokenType.Number)
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74 .Or(literal.Tag(TokenType.Literal))
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75 .Or(quote.Tag(TokenType.StringBound))
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76 .Or(beginObject.Tag(TokenType.BeginObject))
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77 .Or(endObject.Tag(TokenType.EndObject))
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78 .Or(beginArray.Tag(TokenType.BeginArray))
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79 .Or(endArray.Tag(TokenType.EndArray))
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80 .Or(nameSep.Tag(TokenType.NameSeparator))
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81 .Or(valueSep.Tag(TokenType.ValueSeparator));
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82
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83
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84 var jsonStringExpression =
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85 quote.Tag(TokenType.StringBound)
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86 .Or(backSlash.Cat(specialEscapeChars).Tag(TokenType.EscapedChar))
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87 .Or(backSlash.Cat(unicodeEspace).Tag(TokenType.EscapedUnicode))
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88 .Or(unescaped.Closure().Tag(TokenType.UnescapedChar));
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89
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90 var jsonNumberExpression =
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91 minus.Tag(TokenType.Minus)
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92 .Or(SymbolToken('+').Tag(TokenType.Plus))
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93 .Or(digit.Closure().Tag(TokenType.Integer))
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94 .Or(dot.Tag(TokenType.Dot))
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95 .Or(expSign.Tag(TokenType.Exp));
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96
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97 m_jsonDFA = BuildDFA(jsonExpression);
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98 m_stringDFA = BuildDFA(jsonStringExpression);
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99 }
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100
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101 public CDFADefinition JsonDFA {
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102 get {
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103 return m_jsonDFA;
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104 }
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105 }
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106
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107 public CDFADefinition JsonStringDFA {
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108 get {
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109 return m_stringDFA;
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110 }
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111 }
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112 }
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113 }
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