a78fb8e917
These will be useful for passing source positions through Parsec's string error mechanism.
78 lines
2.3 KiB
Haskell
78 lines
2.3 KiB
Haskell
{-
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Tock: a compiler for parallel languages
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Copyright (C) 2007 University of Kent
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 2 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>.
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-}
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-- | Metadata -- i.e. source position.
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module Metadata where
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{-! global : Haskell2Xml !-}
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import Data.Generics
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import Text.Printf
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import Text.Read
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import Utils
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data Meta = Meta {
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metaFile :: Maybe String,
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metaLine :: Int,
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metaColumn :: Int
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}
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deriving (Typeable, Data)
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emptyMeta :: Meta
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emptyMeta = Meta {
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metaFile = Nothing,
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metaLine = 0,
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metaColumn = 0
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}
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instance Show Meta where
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show m =
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case metaFile m of
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Just s -> basenamePath s ++ ":" ++ show (metaLine m) ++ ":" ++ show (metaColumn m)
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Nothing -> "no source position"
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--emptyMeta is equal to any meta tag:
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instance Eq Meta where
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(==) a b =
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if ((metaFile a == Nothing) && (metaLine a == 0) && (metaColumn a == 0)) then True else
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if ((metaFile b == Nothing) && (metaLine b == 0) && (metaColumn b == 0)) then True else
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((metaFile a == metaFile b) && (metaLine a == metaLine b) && (metaColumn a == metaColumn b))
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-- | Encode a Meta as the prefix of a string.
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packMeta :: Meta -> String -> String
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packMeta m s
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= case metaFile m of
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Nothing -> s
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Just fn -> printf "~%d\0%d\0%s\0%s"
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(metaLine m) (metaColumn m) fn s
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-- | Extract a Meta (encoded by packMeta) from a String.
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unpackMeta :: String -> (Meta, String)
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unpackMeta ('~':s) = (m, rest)
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where
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(ls, _:s') = break (== '\0') s
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(cs, _:s'') = break (== '\0') s'
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(fn, _:rest) = break (== '\0') s''
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m = emptyMeta {
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metaFile = Just fn,
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metaLine = read ls,
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metaColumn = read cs
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}
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unpackMeta s = (emptyMeta, s)
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