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module Contract.Names
( isSpecName, toSpecName, toSpecQName, fromSpecName
, isPreCondName, toPreCondName, toPreCondQName, fromPreCondName
, isPostCondName, toPostCondName, toPostCondQName, fromPostCondName
, isNonFailName, toNonFailName, toNonFailQName, fromNonFailName
, decodeContractQName, decodeContractName
, encodeContractQName, encodeContractName
) where
import Char ( isAlphaNum )
import List ( isPrefixOf, isSuffixOf )
import ReadNumeric ( readHex )
isSpecName :: String -> Bool
isSpecName f = "'spec" `isSuffixOf` f
toSpecName :: String -> String
toSpecName = (++"'spec")
toSpecQName :: (String,String) -> (String,String)
toSpecQName (mn,fn) = (mn, toSpecName fn)
fromSpecName :: String -> String
fromSpecName f =
let rf = reverse f
in reverse (drop (if take 5 rf == "ceps'" then 5 else 0) rf)
isPreCondName :: String -> Bool
isPreCondName f = "'pre" `isSuffixOf` f
toPreCondName :: String -> String
toPreCondName = (++ "'pre")
toPreCondQName :: (String,String) -> (String,String)
toPreCondQName (mn,fn) = (mn, toPreCondName fn)
fromPreCondName :: String -> String
fromPreCondName f =
let rf = reverse f
in reverse (drop (if take 4 rf == "erp'" then 4 else 0) rf)
isPostCondName :: String -> Bool
isPostCondName f = "'post" `isSuffixOf` f
toPostCondName :: String -> String
toPostCondName = (++"'post")
toPostCondQName :: (String,String) -> (String,String)
toPostCondQName (mn,fn) = (mn, toPostCondName fn)
fromPostCondName :: String -> String
fromPostCondName f =
let rf = reverse f
in reverse (drop (if take 5 rf == "tsop'" then 5 else 0) rf)
isNonFailName :: String -> Bool
isNonFailName f = "'nonfail" `isSuffixOf` f
toNonFailName :: String -> String
toNonFailName = (++"'nonfail")
toNonFailQName :: (String,String) -> (String,String)
toNonFailQName (mn,fn) = (mn, toNonFailName fn)
fromNonFailName :: String -> String
fromNonFailName f =
let rf = reverse f
in reverse (drop (if take 8 rf == "liafnon'" then 8 else 0) rf)
decodeContractQName :: (String,String) -> (String,String)
decodeContractQName (mn,fn) = (mn, decodeContractName fn)
decodeContractName :: String -> String
decodeContractName fn
| "op_x" `isPrefixOf` fn && not (null fntail) = fromHex [] (drop 4 fnop)
| otherwise = fn
where
(fnop,fntail) = break (=='\'')fn
fromHex s "" = reverse s ++ fntail
fromHex _ [_] = fn
fromHex s (c1:c2:cs) =
maybe fn
(\ (i,r) -> if null r then fromHex (chr i : s) cs else fn)
(readHex [c1,c2])
encodeContractQName :: (String,String) -> (String,String)
encodeContractQName (mn,fn) = (mn, encodeContractName fn)
encodeContractName :: String -> String
encodeContractName fn
| null rop || null rsuf ||
all (\c -> isAlphaNum c || c == '\''|| c == '_') rop
= fn
| otherwise
= "op_x" ++ concatMap toHex (reverse (tail rop)) ++ '\'': reverse rsuf
where
(rsuf,rop) = break (=='\'')(reverse fn)
toHex c = let n = ord c in [toHexDigit (n `div` 16), toHexDigit (n `mod` 16)]
toHexDigit i = if i<10 then chr (ord '0' + i)
else chr (ord 'A' + i - 10)
|