| Line No. | Rev | Author | Line |
|---|---|---|---|
| 1 | 1 | paulosilva | |
| 2 | {-# LANGUAGE TypeOperators, FlexibleContexts #-} | ||
| 3 | {-# OPTIONS_GHC -Wall #-} | ||
| 4 | |||
| 5 | ------------------------------------------------------------------------------- | ||
| 6 | |||
| 7 | {- | | ||
| 8 | Module : Language.Combinator.Parser | ||
| 9 | Description : | ||
| 10 | Copyright : (c) Paulo Silva | ||
| 11 | License : LGPL | ||
| 12 | |||
| 13 | Maintainer : paufil@di.uminho.pt | ||
| 14 | Stability : experimental | ||
| 15 | Portability : portable | ||
| 16 | |||
| 17 | <description of the module> | ||
| 18 | -} | ||
| 19 | |||
| 20 | ------------------------------------------------------------------------------- | ||
| 21 | |||
| 22 | module Language.Combinator.Parser ( | ||
| 23 | parser, | ||
| 24 | parseComb | ||
| 25 | ) where | ||
| 26 | |||
| 27 | import Control.GalcError | ||
| 28 | import Control.Monad.Error | ||
| 29 | import Language.Combinator.Syntax | ||
| 30 | import qualified Language.Derivation.Parser as D | ||
| 31 | import Text.ParserCombinators.Parsec | ||
| 32 | import Text.ParserCombinators.Parsec.Language | ||
| 33 | import qualified Text.ParserCombinators.Parsec.Token as P | ||
| 34 | |||
| 35 | ------------------------------------------------------------------------------- | ||
| 36 | |||
| 37 | type CombParser = Parser Combinator | ||
| 38 | |||
| 39 | ------------------------------------------------------------------------------- | ||
| 40 | |||
| 41 | reservNames :: [String] | ||
| 42 | reservNames = combinators | ||
| 43 | |||
| 44 | ------------------------------------------------------------------------------- | ||
| 45 | |||
| 46 | lexer :: P.TokenParser st | ||
| 47 | lexer = P.makeTokenParser $ emptyDef { P.reservedNames = reservNames } | ||
| 48 | |||
| 49 | ------------------------------------------------------------------------------- | ||
| 50 | |||
| 51 | reserved :: String -> CharParser st () | ||
| 52 | reserved = P.reserved lexer | ||
| 53 | |||
| 54 | whiteSpace :: CharParser st () | ||
| 55 | whiteSpace = P.whiteSpace lexer | ||
| 56 | |||
| 57 | parens :: CharParser st Combinator -> CharParser st Combinator | ||
| 58 | parens = P.parens lexer | ||
| 59 | |||
| 60 | ------------------------------------------------------------------------------- | ||
| 61 | |||
| 62 | parser :: MonadError GalcError m => String -> m Combinator | ||
| 63 | parser = either2error (ParsingError . show) . parse mainCombParser "" | ||
| 64 | |||
| 65 | ------------------------------------------------------------------------------- | ||
| 66 | |||
| 67 | mainCombParser :: CombParser | ||
| 68 | mainCombParser = do | ||
| 69 | whiteSpace | ||
| 70 | t <- parseComb | ||
| 71 | eof | ||
| 72 | return t | ||
| 73 | |||
| 74 | ------------------------------------------------------------------------------- | ||
| 75 | |||
| 76 | parseComb :: CombParser | ||
| 77 | parseComb = | ||
| 78 | parens parseComb <|> | ||
| 79 | parseNop <|> | ||
| 80 | parseFail <|> | ||
| 81 | parseSeq <|> | ||
| 82 | parseChoice <|> | ||
| 83 | parseLChoice <|> | ||
| 84 | parseMany <|> | ||
| 85 | parseMany1 <|> | ||
| 86 | parseTry <|> | ||
| 87 | parseOnce <|> | ||
| 88 | parseEverywhere <|> | ||
| 89 | parseEverywhere' <|> | ||
| 90 | parseInnermost <|> | ||
| 91 | parseAll <|> | ||
| 92 | parseOne <|> | ||
| 93 | parseRule | ||
| 94 | |||
| 95 | ------------------------------------------------------------------------------- | ||
| 96 | |||
| 97 | parseNop :: CombParser | ||
| 98 | parseNop = do | ||
| 99 | reserved "nop" | ||
| 100 | return Nop | ||
| 101 | |||
| 102 | ------------------------------------------------------------------------------- | ||
| 103 | |||
| 104 | parseFail :: CombParser | ||
| 105 | parseFail = do | ||
| 106 | reserved "fail" | ||
| 107 | return Fail | ||
| 108 | |||
| 109 | ------------------------------------------------------------------------------- | ||
| 110 | |||
| 111 | parseSeq :: CombParser | ||
| 112 | parseSeq = do | ||
| 113 | reserved "seq" | ||
| 114 | c1 <- parseComb | ||
| 115 | c2 <- parseComb | ||
| 116 | return $ Seq c1 c2 | ||
| 117 | |||
| 118 | ------------------------------------------------------------------------------- | ||
| 119 | |||
| 120 | parseChoice :: CombParser | ||
| 121 | parseChoice = do | ||
| 122 | reserved "choice" | ||
| 123 | c1 <- parseComb | ||
| 124 | c2 <- parseComb | ||
| 125 | return $ Choice c1 c2 | ||
| 126 | |||
| 127 | ------------------------------------------------------------------------------- | ||
| 128 | |||
| 129 | parseLChoice :: CombParser | ||
| 130 | parseLChoice = do | ||
| 131 | reserved "lchoice" | ||
| 132 | c1 <- parseComb | ||
| 133 | c2 <- parseComb | ||
| 134 | return $ LChoice c1 c2 | ||
| 135 | |||
| 136 | ------------------------------------------------------------------------------- | ||
| 137 | |||
| 138 | parseMany :: CombParser | ||
| 139 | parseMany = do | ||
| 140 | reserved "many" | ||
| 141 | c <- parseComb | ||
| 142 | return $ Many c | ||
| 143 | |||
| 144 | ------------------------------------------------------------------------------- | ||
| 145 | |||
| 146 | parseMany1 :: CombParser | ||
| 147 | parseMany1 = do | ||
| 148 | reserved "many1" | ||
| 149 | c <- parseComb | ||
| 150 | return $ Many1 c | ||
| 151 | |||
| 152 | ------------------------------------------------------------------------------- | ||
| 153 | |||
| 154 | parseTry :: CombParser | ||
| 155 | parseTry = do | ||
| 156 | reserved "try" | ||
| 157 | c <- parseComb | ||
| 158 | return $ Try c | ||
| 159 | |||
| 160 | ------------------------------------------------------------------------------- | ||
| 161 | |||
| 162 | parseOnce :: CombParser | ||
| 163 | parseOnce = do | ||
| 164 | reserved "once" | ||
| 165 | c <- parseComb | ||
| 166 | return $ Once c | ||
| 167 | |||
| 168 | ------------------------------------------------------------------------------- | ||
| 169 | |||
| 170 | parseEverywhere :: CombParser | ||
| 171 | parseEverywhere = do | ||
| 172 | reserved "everywhere" | ||
| 173 | c <- parseComb | ||
| 174 | return $ Everywhere c | ||
| 175 | |||
| 176 | ------------------------------------------------------------------------------- | ||
| 177 | |||
| 178 | parseEverywhere' :: CombParser | ||
| 179 | parseEverywhere' = do | ||
| 180 | 7 | paulosilva | reserved "everywhere'" |
| 181 | 1 | paulosilva | c <- parseComb |
| 182 | return $ Everywhere' c | ||
| 183 | |||
| 184 | ------------------------------------------------------------------------------- | ||
| 185 | |||
| 186 | parseInnermost :: CombParser | ||
| 187 | parseInnermost = do | ||
| 188 | reserved "innermost" | ||
| 189 | c <- parseComb | ||
| 190 | return $ Innermost c | ||
| 191 | |||
| 192 | ------------------------------------------------------------------------------- | ||
| 193 | |||
| 194 | parseAll :: CombParser | ||
| 195 | parseAll = do | ||
| 196 | reserved "all" | ||
| 197 | c <- parseComb | ||
| 198 | return $ All c | ||
| 199 | |||
| 200 | ------------------------------------------------------------------------------- | ||
| 201 | |||
| 202 | parseOne :: CombParser | ||
| 203 | parseOne = do | ||
| 204 | reserved "one" | ||
| 205 | c <- parseComb | ||
| 206 | return $ One c | ||
| 207 | |||
| 208 | ------------------------------------------------------------------------------- | ||
| 209 | |||
| 210 | parseRule :: CombParser | ||
| 211 | parseRule = do | ||
| 212 | drv <- D.parseDeriv | ||
| 213 | return $ Rule drv | ||
| 214 | |||
| 215 | ------------------------------------------------------------------------------- |