root / src / Ganeti / Hs2Py / GenConstants.hs @ 9d049fb4
History | View | Annotate | Download (1.7 kB)
1 |
{-| Template Haskell code for Haskell to Python constants. |
---|---|
2 |
|
3 |
-} |
4 |
|
5 |
{- |
6 |
|
7 |
Copyright (C) 2013 Google Inc. |
8 |
|
9 |
This program is free software; you can redistribute it and/or modify |
10 |
it under the terms of the GNU General Public License as published by |
11 |
the Free Software Foundation; either version 2 of the License, or |
12 |
(at your option) any later version. |
13 |
|
14 |
This program is distributed in the hope that it will be useful, but |
15 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
16 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 |
General Public License for more details. |
18 |
|
19 |
You should have received a copy of the GNU General Public License |
20 |
along with this program; if not, write to the Free Software |
21 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
22 |
02110-1301, USA. |
23 |
|
24 |
-} |
25 |
{-# LANGUAGE TemplateHaskell #-} |
26 |
module Ganeti.Hs2Py.GenConstants (genPyConstants) where |
27 |
|
28 |
import Language.Haskell.TH |
29 |
|
30 |
import Ganeti.THH |
31 |
|
32 |
fileFromModule :: Maybe String -> String |
33 |
fileFromModule Nothing = "" |
34 |
fileFromModule (Just name) = "src/" ++ map dotToSlash name ++ ".hs" |
35 |
where dotToSlash '.' = '/' |
36 |
dotToSlash c = c |
37 |
|
38 |
comment :: Name -> String |
39 |
comment name = |
40 |
"# Generated automatically from Haskell constant '" ++ nameBase name ++ |
41 |
"' in file '" ++ fileFromModule (nameModule name) ++ "'" |
42 |
|
43 |
genList :: Name -> [Name] -> Q [Dec] |
44 |
genList name consNames = do |
45 |
let cons = listE $ map (\n -> tupE [mkString n, mkPyValueEx n]) consNames |
46 |
sig <- sigD name [t| [(String, String)] |] |
47 |
fun <- funD name [clause [] (normalB cons) []] |
48 |
return [sig, fun] |
49 |
where mkString n = stringE (comment n ++ "\n" ++ deCamelCase (nameBase n)) |
50 |
mkPyValueEx n = [| showValue $(varE n) |] |
51 |
|
52 |
genPyConstants :: String -> [Name] -> Q [Dec] |
53 |
genPyConstants name = genList (mkName name) |