blob: f48d0d444b094b22b0be0d708c9d2a2842096b0c (
plain)
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
|
module GF.Command.Parse(readCommandLine, pCommand) where
import PGF.CId
import PGF.Expr
import PGF.Data(Tree)
import GF.Command.Abstract
import Data.Char
import Control.Monad
import qualified Text.ParserCombinators.ReadP as RP
readCommandLine :: String -> Maybe CommandLine
readCommandLine s = case [x | (x,cs) <- RP.readP_to_S pCommandLine s, all isSpace cs] of
[x] -> Just x
_ -> Nothing
test s = RP.readP_to_S pCommandLine s
pCommandLine = RP.sepBy (RP.skipSpaces >> pPipe) (RP.skipSpaces >> RP.char ';')
pPipe = RP.sepBy1 (RP.skipSpaces >> pCommand) (RP.skipSpaces >> RP.char '|')
pCommand = (do
cmd <- pIdent RP.<++ (RP.char '%' >> pIdent >>= return . ('%':))
RP.skipSpaces
opts <- RP.sepBy pOption RP.skipSpaces
arg <- pArgument
return (Command cmd opts arg)
)
RP.<++ (do
RP.char '?'
c <- pSystemCommand
return (Command "sp" [OFlag "command" (VStr c)] ANoArg)
)
pOption = do
RP.char '-'
flg <- pIdent
RP.option (OOpt flg) (fmap (OFlag flg) (RP.char '=' >> pValue))
pValue = do
fmap (VInt . read) (RP.munch1 isDigit)
RP.<++
fmap VStr pStr
RP.<++
fmap VId pFilename
pFilename = liftM2 (:) (RP.satisfy isFileFirst) (RP.munch (not . isSpace)) where
isFileFirst c = not (isSpace c) && not (isDigit c)
pArgument =
RP.option ANoArg
(fmap ATree (pTree False)
RP.<++
(RP.munch isSpace >> RP.char '%' >> fmap AMacro pIdent))
pSystemCommand =
RP.munch isSpace >> (
(RP.char '"' >> (RP.manyTill (pEsc RP.<++ RP.get) (RP.char '"')))
RP.<++
RP.many RP.get
)
where
pEsc = RP.char '\\' >> RP.get
|
