~jojo/Carth

ref: ee5251b9b8bf725c1d5499fedf9c9671308fa476 Carth/src/Misc.hs -rw-r--r-- 2.6 KiB
ee5251b9JoJo Glob exports in AST modules -- minor refactor / cleanup 2 years ago
                                                                                
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
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances, LambdaCase, RankNTypes #-}

module Misc
    ( ice
    , nyi
    , precalate
    , indent
    , both
    , secondM
    , locally
    , locallySet
    , augment
    , scribe
    , (<<+=)
    , abort
    , splitOn
    , (.*)
    , (.**)
    , TopologicalOrder(..)
    )
where

import Data.List (intercalate)
import qualified Data.Map as Map
import Data.Map (Map)
import Data.Maybe
import Control.Monad.Reader
import Control.Monad.Writer
import Control.Monad.State
import Lens.Micro.Platform (Lens, Lens', over, set, use, modifying)
import Data.Bitraversable
import System.Exit
import qualified Text.Megaparsec as Mega
import Text.Megaparsec hiding (parse, match)
import Text.Megaparsec.Char hiding (space, space1)
import Data.Void

newtype TopologicalOrder a = Topo [a]
    deriving Show

ice :: String -> a
ice = error . ("Internal Compiler Error: " ++)

nyi :: String -> a
nyi = error . ("Not yet implemented: " ++)

-- | Like `intercalate`, but concatenate a list with a prefix before each
--   element, instead of an separator between each pair of elements.
precalate :: [a] -> [[a]] -> [a]
precalate prefix = \case
    [] -> []
    xs -> prefix ++ intercalate prefix xs

indent :: Int -> String
indent = flip replicate ' '

both :: (a -> b) -> (a, a) -> (b, b)
both f (a0, a1) = (f a0, f a1)

secondM
    :: (Bitraversable t, Applicative f) => (b -> f b') -> t a b -> f (t a b')
secondM = bimapM pure

locallySet :: MonadReader s m => Lens' s a -> a -> m r -> m r
locallySet l = locally l . const

locally :: MonadReader s m => Lens' s a -> (a -> a) -> m r -> m r
locally l f = local (over l f)

augment
    :: (MonadReader e m, Ord k) => Lens' e (Map k v) -> Map k v -> m a -> m a
augment l = locally l . Map.union

scribe :: (MonadWriter t m, Monoid s) => Lens s t a b -> b -> m ()
scribe l b = tell (set l b mempty)

(<<+=) :: (MonadState s m, Num a) => Lens' s a -> a -> m a
(<<+=) l n = use l <* modifying l (+ n)

(.*) :: (c -> d) -> (a -> b -> c) -> a -> b -> d
(.*) = (.) . (.)
infixr 8 .*

(.**) :: (d -> e) -> (a -> b -> c -> d) -> a -> b -> c -> e
(.**) = (.) . (.*)
infixr 8 .**

abort :: FilePath -> IO a
abort f = do
    putStrLn "Error: Aborting due to previous error."
    putStrLn $ "Error: Could not compile " ++ f ++ "."
    exitFailure

splitOn :: String -> String -> [String]
splitOn sep = fromMaybe [] . Mega.parseMaybe splitOn'
  where
    splitOn' :: Parsec Void String [String]
    splitOn' = do
        as <- many (try (manyTill anySingle (try (string sep))))
        a <- many anySingle
        pure $ (as ++) $ if not (null a) then [a] else []