PNET.hs 5.96 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
module Parser.PNET
    (parseContent)
where

import Control.Applicative ((<*),(*>),(<*>),(<$>))
import Text.Parsec
import Text.Parsec.Language (LanguageDef, emptyDef)
import qualified Text.Parsec.Token as Token

import Parser
import PetriNet (PetriNet,makePetriNet)
import Property

languageDef :: LanguageDef ()
languageDef =
        emptyDef {
                 Token.commentStart    = "/*",
                 Token.commentEnd      = "*/",
                 Token.commentLine     = "//",
                 Token.identStart      = letter <|> char '_',
                 Token.identLetter     = alphaNum <|> char '_',
22
                 Token.reservedNames   = ["true", "false"],
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
                 Token.reservedOpNames = ["->", "<", "<=", "=", ">=", ">",
                                          "+", "-", "*", "&&", "||", "!"]
                 }

lexer :: Token.TokenParser ()
lexer = Token.makeTokenParser languageDef

identifier :: Parser String
identifier = Token.identifier lexer -- parses an identifier
stringLiteral :: Parser String
stringLiteral = Token.stringLiteral lexer -- parses a string literal
reserved :: String -> Parser ()
reserved   = Token.reserved   lexer -- parses a reserved name
reservedOp :: String -> Parser ()
reservedOp = Token.reservedOp lexer -- parses an operator
brackets :: Parser a -> Parser a
brackets   = Token.brackets   lexer -- parses p surrounded by brackets
braces :: Parser a -> Parser a
braces     = Token.braces     lexer -- parses p surrounded by braces
parens :: Parser a -> Parser a
parens     = Token.parens     lexer -- parses p surrounded by parenthesis
natural :: Parser Integer
natural    = Token.natural    lexer -- parses a natural number
integer :: Parser Integer
integer    = Token.integer    lexer -- parses an integer
comma :: Parser String
comma      = Token.comma       lexer -- parses a comma
whiteSpace :: Parser ()
whiteSpace = Token.whiteSpace lexer -- parses whitespace


optionalCommaSep :: Parser a -> Parser [a]
optionalCommaSep p = many (p <* optional comma)

singleOrList :: Parser a -> Parser [a]
singleOrList p = braces (optionalCommaSep p) <|> (:[]) <$> p

numberOption :: Parser Integer
numberOption = option 1 (brackets natural)

ident :: Parser String
ident = (identifier <|> stringLiteral) <?> "identifier"

identList :: Parser [String]
identList = singleOrList ident

places :: Parser [String]
places = reserved "places" *> identList

transitions :: Parser [String]
transitions = reserved "transitions" *> identList

initial :: Parser [(String,Integer)]
initial = reserved "initial" *> singleOrList (do
            n <- ident
            i <- numberOption
            return (n,i)
          )

arc :: Parser [(String,String,Integer)]
arc = do
        lhs <- identList
        rhsList <- many1 (do
                reservedOp "->"
                w <- numberOption
                ids <- identList
                return (ids,w)
            )
        return $ fst $ foldl makeArc ([],lhs) rhsList
      where
        makeArc (as,lhs) (rhs,w) = ([(l,r,w) | l <- lhs, r <- rhs] ++ as, rhs)

arcs :: Parser [(String,String,Integer)]
arcs = do
        reserved "arcs"
        as <- singleOrList arc
        return $ concat as

data Statement = Places [String] | Transitions [String] |
                 Arcs [(String,String,Integer)] | Initial [(String,Integer)]

statement :: Parser Statement
statement = Places <$> places <|>
            Transitions <$> transitions <|>
            Arcs <$> arcs <|>
            Initial <$> initial

petriNet :: Parser PetriNet
petriNet = do
            reserved "petri"
            reserved "net"
            name <- option "" ident
            statements <- braces (many statement)
            let (p,t,a,i) = foldl splitStatement ([],[],[],[]) statements
            return $ makePetriNet name p t a i
        where
            splitStatement (ps,ts,as,is) stmnt = case stmnt of
                  Places p -> (p ++ ps,ts,as,is)
                  Transitions t -> (ps,t ++ ts,as,is)
                  Arcs a -> (ps,ts,a ++ as,is)
                  Initial i -> (ps,ts,as,i ++ is)

preFactor :: Parser Integer
preFactor = (reservedOp "-" *> return (-1)) <|>
            (reservedOp "+" *> return 1)

linAtom :: Integer -> Parser LinAtom
linAtom fac = ( integer >>= \lhs ->
                option (Const (fac*lhs)) $ Var (fac*lhs) <$> (reservedOp "*" *> ident)
              ) <|> Var fac <$> ident

term :: Parser Term
term = Term <$> ((:) <$> (option 1 preFactor >>= linAtom) <*>
                         many (preFactor >>= linAtom))

parseOp :: Parser Op
parseOp = (reservedOp "<" *> return Lt) <|>
          (reservedOp "<=" *> return Le) <|>
          (reservedOp "=" *> return Eq) <|>
          (reservedOp ">" *> return Gt) <|>
          (reservedOp ">=" *> return Ge)

145
146
linIneq :: Parser Formula
linIneq = do
147
148
149
150
151
        lhs <- term
        op <- parseOp
        rhs <- term
        return (Atom (LinIneq lhs op rhs))

152
153
154
155
156
atom :: Parser Formula
atom = (reserved "true" *> return FTrue) <|>
       (reserved "false" *> return FFalse) <|>
       linIneq

157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
parensForm :: Parser Formula
parensForm = atom <|> parens formula

negation :: Parser Formula
negation = (Neg <$> (reservedOp "!" *> negation)) <|> parensForm

conjunction :: Parser Formula
conjunction = do
        lhs <- negation
        option lhs ((lhs :&:) <$> (reservedOp "&&" *> conjunction))

disjunction :: Parser Formula
disjunction = do
        lhs <- conjunction
        option lhs ((lhs :|:) <$> (reservedOp "||" *> disjunction))

formula :: Parser Formula
formula = disjunction

propertyType :: Parser PropertyType
propertyType =
        (reserved "safety" *> return Safety) <|>
        (reserved "liveness" *> return Liveness)

property :: Parser Property
property = do
        pt <- propertyType
        reserved "property"
        name <- option "" ident
        form <- braces formula
        return Property { pname=name, ptype=pt, pformula=form }

parseContent :: Parser (PetriNet,[Property])
parseContent = do
        whiteSpace
        net <- petriNet
        properties <- many property
        eof
        return (net, properties)