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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE DefaultSignatures #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Coalpit where
import Data.List
import GHC.Generics
import Text.Megaparsec
import Text.Megaparsec.Char
import Data.Maybe
import Data.Char
import Data.Proxy
import Data.Semigroup
import Data.Either
advance :: Pos -> SourcePos -> t -> SourcePos
advance width (SourcePos n l c) t = SourcePos n l (c <> pos1)
instance Stream [String] where
type Token [String] = String
type Tokens [String] = [String]
tokenToChunk Proxy = pure
tokensToChunk Proxy = id
chunkToTokens Proxy = id
chunkLength Proxy = length
chunkEmpty Proxy = null
advance1 Proxy = advance
advanceN Proxy w = foldl' (advance w)
take1_ [] = Nothing
take1_ (t:ts) = Just (t, ts)
takeN_ n s
| n <= 0 = Just ([], s)
| null s = Nothing
| otherwise = Just (splitAt n s)
takeWhile_ = span
type Parser = Parsec String [String]
pS :: Parsec String String a -> Parsec String [String] a
pS p = try $ do
x <- token Right Nothing
case parse p "argument" x of
Left e -> fail $ show e
Right x -> pure x
data Modifiers = Modifiers { conNameMod :: String -> String
, selNameMod :: String -> String }
defMod :: Modifiers
defMod = Modifiers (map toLower) (("--" ++) . map toLower)
-- Core classes
class ArgParser a where
argParser :: Modifiers -> Parser a
default argParser :: (Generic a, GArgParser (Rep a)) => Modifiers -> Parser a
argParser m = to <$> gArgParser m
class GArgParser f where
gArgParser :: Modifiers -> Parser (f a)
class ToArgs a where
toArgs :: Modifiers -> a -> [String]
default toArgs :: (Generic a, GToArgs (Rep a)) => Modifiers -> a -> [String]
toArgs m a = gToArgs m (from a)
class GToArgs f where
gToArgs :: Modifiers -> f a -> [String]
-- Units
instance GArgParser U1 where
gArgParser _ = pure U1
instance GToArgs U1 where
gToArgs _ U1 = []
-- Products
instance (GArgParser a, GArgParser b) => GArgParser (a :*: b) where
gArgParser m = (:*:) <$> gArgParser m <*> gArgParser m
instance (GToArgs a, GToArgs b) => GToArgs (a :*: b) where
gToArgs m (a :*: b) = gToArgs m a ++ gToArgs m b
-- Sums
instance (Constructor c1, GArgParser f1, GArgParser (f :+: g)) =>
GArgParser ((f :+: g) :+: C1 c1 f1) where
gArgParser m =
L1 <$> gArgParser m
<|>
R1 <$> (pS (string (conNameMod m $ conName (undefined :: C1 c1 f a)))
*> gArgParser m)
instance (Constructor c1, GArgParser f1, GArgParser (f :+: g)) =>
GArgParser (C1 c1 f1 :+: (f :+: g)) where
gArgParser m =
L1 <$> (pS (string (conNameMod m $ conName (undefined :: C1 c1 f a)))
*> gArgParser m)
<|>
R1 <$> gArgParser m
instance (Constructor c1, Constructor c2, GArgParser f1, GArgParser f2) =>
GArgParser (C1 c1 f1 :+: C1 c2 f2) where
gArgParser m =
L1 <$> (pS (string (conNameMod m $ conName (undefined :: C1 c1 f a)))
*> gArgParser m)
<|>
R1 <$> (pS (string (conNameMod m $ conName (undefined :: C1 c2 f a)))
*> gArgParser m)
instance (Constructor c1, GToArgs f1, GToArgs (f :+: g)) =>
GToArgs ((f :+: g) :+: C1 c1 f1) where
gToArgs m (L1 x) = gToArgs m x
gToArgs m (R1 x) = conNameMod m (conName x) : gToArgs m x
instance (Constructor c1, GToArgs f1, GToArgs (f :+: g)) =>
GToArgs (C1 c1 f1 :+: (f :+: g)) where
gToArgs m (L1 x) = conNameMod m (conName x) : gToArgs m x
gToArgs m (R1 x) = gToArgs m x
instance (Constructor c1, Constructor c2, GToArgs f1, GToArgs f2) =>
GToArgs (C1 c1 f1 :+: C1 c2 f2) where
gToArgs m (L1 x) = conNameMod m (conName x) : gToArgs m x
gToArgs m (R1 x) = conNameMod m (conName x) : gToArgs m x
-- Record Selectors
instance (GArgParser a, Selector c) => GArgParser (S1 c a) where
gArgParser m = M1 <$> do
let sname = case selName (undefined :: S1 c a f) of
"" -> pure ()
name -> pS (string (selNameMod m name) >> pure ())
sname *> gArgParser m
instance (GToArgs a, Selector c) => GToArgs (S1 c a) where
gToArgs m s@(M1 x) = case selName s of
"" -> gToArgs m x
name -> selNameMod m name : gToArgs m x
-- Optional arguments
instance {-#OVERLAPPING#-}
(ArgParser a, Selector c) => GArgParser (S1 c (Rec0 (Maybe a))) where
gArgParser m =
case selName (undefined :: S1 c (Rec0 (Maybe a)) f) of
"" -> M1 <$> gArgParser m
name -> do
x <- optional $ pS (string (selNameMod m name)) *> argParser m
pure $ M1 $ K1 x
instance {-#OVERLAPPING#-}
(ToArgs a, Selector c) => GToArgs (S1 c (Rec0 (Maybe a))) where
gToArgs m s@(M1 (K1 x)) = case (selName s, x) of
("", _) -> toArgs m x
(_, Nothing) -> []
(name, Just x') -> selNameMod m name : toArgs m x'
-- Constructors
instance (GArgParser a, Constructor c) => GArgParser (C1 c a) where
gArgParser m = M1 <$> gArgParser m
instance (GToArgs a, Constructor c) => GToArgs (C1 c a) where
gToArgs m c@(M1 x) = gToArgs m x
-- Data types
instance (GArgParser a, Datatype c) => GArgParser (D1 c a) where
gArgParser m = M1 <$> gArgParser m
instance (GToArgs a, Datatype c) => GToArgs (D1 c a) where
gToArgs m d@(M1 x) = gToArgs m x
-- Constraints and such
instance (ArgParser a) => GArgParser (K1 i a) where
gArgParser m = K1 <$> argParser m
instance (ToArgs a) => GToArgs (K1 i a) where
gToArgs m (K1 x) = toArgs m x
-- Basic types
instance ArgParser Int where
argParser _ = do
x <- token Right Nothing
case reads x of
[(n, "")] -> pure n
_ -> fail "Failed to read an Int"
instance ToArgs Int where
toArgs _ i = [show i]
instance {-#OVERLAPPING#-} ArgParser String where
argParser _ = token Right Nothing
instance {-#OVERLAPPING#-} ToArgs String where
toArgs _ i = [i]
instance ArgParser Double where
argParser _ = do
x <- token Right Nothing
case reads x of
[(n, "")] -> pure n
_ -> fail $ "Failed to read a Double: " ++ x
instance ToArgs Double where
toArgs _ i = [show i]
instance ArgParser a => ArgParser (Maybe a)
instance ToArgs a => ToArgs (Maybe a)
instance ArgParser a => ArgParser [a]
instance ToArgs a => ToArgs [a]
instance (ArgParser a, ArgParser b) => ArgParser (Either a b)
instance (ToArgs a, ToArgs b) => ToArgs (Either a b)
|