d2c0fd674e
This used to work by adding a magic prefix to the error message, but it appears that doesn't work with the GHC 6.6 version of Parsec. It now searches for a magic substring anywhere in the error message. It uses // as a delimeter rather than \0 now, since including nulls in Strings causes problems -- for example, putStr "a\0b" will only print "a".
81 lines
2.5 KiB
Haskell
81 lines
2.5 KiB
Haskell
{-
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Tock: a compiler for parallel languages
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Copyright (C) 2007, 2008 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 Numeric
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import Text.Printf
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import Text.Regex
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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, Ord, Eq)
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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 -> s ++ ":" ++ show (metaLine m) ++ ":" ++ show (metaColumn m)
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Nothing -> "no source position"
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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 "//pos:%d:%d:%s//%s"
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(metaLine m) (metaColumn m) (unslash fn) s
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where
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-- | Remove doubled slashes from a string, so we can unambiguously encode it.
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unslash :: String -> String
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unslash s = subRegex (mkRegex "//+") s "/"
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-- | Extract a Meta (encoded by packMeta) from a String.
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unpackMeta :: String -> (Maybe Meta, String)
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unpackMeta s
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= case matchRegex metaRE s of
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Just [before, line, col, file, after] ->
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(Just $ Meta (Just file) (getInt line) (getInt col), before ++ after)
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Nothing -> (Nothing, s)
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where
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metaRE = mkRegex "^(.*)//pos:([0-9]*):([0-9]*):(.*)//(.*)$"
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getInt s = case readDec s of [(v, "")] -> v
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-- | Find the first Meta value in some part of the AST.
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findMeta :: (Data t, Typeable t) => t -> Meta
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findMeta e = case cast e of
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Just m -> m
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Nothing -> if null (concat metaList) then emptyMeta else head (concat metaList)
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where
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metaList = gmapQ (mkQ [] findMeta') e
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findMeta' :: Meta -> [Meta]
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findMeta' m = [m]
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