1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
module Boilerplater where
import Test.Framework.Providers.QuickCheck2
import Language.Haskell.TH
testProperties :: [Name] -> Q Exp
testProperties nms = fmap ListE $ sequence [[| testProperty $(stringE prop_name) $(varE nm) |]
| nm <- nms
, Just prop_name <- [stripPrefix_maybe "prop_" (nameBase nm)]]
-- This nice clean solution doesn't quite work since I need to use lexically-scoped type
-- variables, which aren't supported by Template Haskell. Argh!
-- testProperties :: Q [Dec] -> Q Exp
-- testProperties mdecs = do
-- decs <- mdecs
-- property_exprs <- sequence [[| testProperty "$prop_name" $(return $ VarE nm) |]
-- | FunD nm _clauses <- decs
-- , Just prop_name <- [stripPrefix_maybe "prop_" (nameBase nm)]]
-- return $ LetE decs (ListE property_exprs)
stripPrefix_maybe :: String -> String -> Maybe String
stripPrefix_maybe prefix what
| what_start == prefix = Just what_end
| otherwise = Nothing
where (what_start, what_end) = splitAt (length prefix) what
|
