Mercurial > pub > ImplabNet
annotate Implab/JSON/JSONGrammar.cs @ 158:130781364799 v2
refactoring, code cleanup
| author | cin |
|---|---|
| date | Thu, 18 Feb 2016 14:34:02 +0300 |
| parents | 97fbbf816844 |
| children |
| rev | line source |
|---|---|
| 55 | 1 using Implab.Parsing; |
| 2 using System.Linq; | |
| 3 | |
| 4 namespace Implab.JSON { | |
|
156
97fbbf816844
Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
72
diff
changeset
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5 class JSONGrammar : Grammar<JSONGrammar> { |
|
97fbbf816844
Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
72
diff
changeset
|
6 public enum TokenType { |
| 55 | 7 None, |
| 8 BeginObject, | |
| 9 EndObject, | |
| 10 BeginArray, | |
| 11 EndArray, | |
| 12 String, | |
| 13 Number, | |
| 14 Literal, | |
| 15 NameSeparator, | |
| 16 ValueSeparator, | |
| 17 | |
| 18 StringBound, | |
| 19 EscapedChar, | |
| 20 UnescapedChar, | |
| 21 EscapedUnicode, | |
| 22 | |
| 23 Minus, | |
| 24 Plus, | |
| 25 Sign, | |
| 26 Integer, | |
| 27 Dot, | |
| 28 Exp | |
| 29 } | |
| 30 | |
| 31 readonly CDFADefinition m_jsonDFA; | |
| 32 readonly CDFADefinition m_stringDFA; | |
| 33 | |
| 34 public JSONGrammar() { | |
| 35 DefineAlphabet(Enumerable.Range(0, 0x20).Select(x => (char)x)); | |
| 36 var hexDigit = SymbolRangeToken('a','f').Or(SymbolRangeToken('A','F')).Or(SymbolRangeToken('0','9')); | |
| 37 var digit9 = SymbolRangeToken('1', '9'); | |
| 38 var zero = SymbolToken('0'); | |
| 39 var digit = zero.Or(digit9); | |
| 40 var dot = SymbolToken('.'); | |
| 41 var minus = SymbolToken('-'); | |
| 42 var sign = SymbolSetToken('-', '+'); | |
| 43 var expSign = SymbolSetToken('e', 'E'); | |
| 44 var letters = SymbolRangeToken('a', 'z'); | |
| 45 var integer = zero.Or(digit9.Cat(digit.EClosure())); | |
| 46 var frac = dot.Cat(digit.Closure()); | |
| 47 var exp = expSign.Cat(sign.Optional()).Cat(digit.Closure()); | |
| 48 var quote = SymbolToken('"'); | |
| 49 var backSlash = SymbolToken('\\'); | |
| 50 var specialEscapeChars = SymbolSetToken('\\', '"', '/', 'b', 'f', 't', 'n', 'r'); | |
| 51 var unicodeEspace = SymbolToken('u').Cat(hexDigit.Repeat(4)); | |
| 52 var whitespace = SymbolSetToken('\n', '\r', '\t', ' ').EClosure(); | |
| 53 var beginObject = whitespace.Cat(SymbolToken('{')).Cat(whitespace); | |
| 54 var endObject = whitespace.Cat(SymbolToken('}')).Cat(whitespace); | |
| 55 var beginArray = whitespace.Cat(SymbolToken('[')).Cat(whitespace); | |
| 56 var endArray = whitespace.Cat(SymbolToken(']')).Cat(whitespace); | |
| 57 var nameSep = whitespace.Cat(SymbolToken(':')).Cat(whitespace); | |
| 58 var valueSep = whitespace.Cat(SymbolToken(',')).Cat(whitespace); | |
| 59 | |
| 60 var number = minus.Optional().Cat(integer).Cat(frac.Optional()).Cat(exp.Optional()); | |
| 61 var literal = letters.Closure(); | |
| 62 var unescaped = SymbolTokenExcept(Enumerable.Range(0, 0x20).Union(new int[] { '\\', '"' }).Select(x => (char)x)); | |
| 63 | |
| 64 var jsonExpression = | |
| 65 number.Tag(TokenType.Number) | |
| 66 .Or(literal.Tag(TokenType.Literal)) | |
| 67 .Or(quote.Tag(TokenType.StringBound)) | |
| 68 .Or(beginObject.Tag(TokenType.BeginObject)) | |
| 69 .Or(endObject.Tag(TokenType.EndObject)) | |
| 70 .Or(beginArray.Tag(TokenType.BeginArray)) | |
| 71 .Or(endArray.Tag(TokenType.EndArray)) | |
| 72 .Or(nameSep.Tag(TokenType.NameSeparator)) | |
| 73 .Or(valueSep.Tag(TokenType.ValueSeparator)); | |
| 74 | |
| 75 | |
| 76 var jsonStringExpression = | |
| 77 quote.Tag(TokenType.StringBound) | |
| 78 .Or(backSlash.Cat(specialEscapeChars).Tag(TokenType.EscapedChar)) | |
| 79 .Or(backSlash.Cat(unicodeEspace).Tag(TokenType.EscapedUnicode)) | |
| 80 .Or(unescaped.Closure().Tag(TokenType.UnescapedChar)); | |
| 72 | 81 |
| 55 | 82 |
| 83 m_jsonDFA = BuildDFA(jsonExpression); | |
| 84 m_stringDFA = BuildDFA(jsonStringExpression); | |
| 85 } | |
| 86 | |
| 87 public CDFADefinition JsonDFA { | |
| 88 get { | |
| 89 return m_jsonDFA; | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 public CDFADefinition JsonStringDFA { | |
| 94 get { | |
| 95 return m_stringDFA; | |
| 96 } | |
| 97 } | |
| 98 } | |
| 99 } |