blob: 0455e3653ac6dab080835151a43fd8058e2078af (
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
65
66
67
68
69
70
71
72
|
----------------------------------------------------------------------
-- |
-- Module : PrGSL
-- Maintainer : BB
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/04/15 09:45:32 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.17 $
--
-- This module prints a CFG as a Nuance GSL 2.0 grammar.
--
-- FIXME: remove \/ warn \/ fail if there are int \/ string literal
-- categories in the grammar
-----------------------------------------------------------------------------
module PrGSL (gslPrinter) where
import SRG
import Ident
import GF.Formalism.CFG
import GF.Formalism.Utilities (Symbol(..))
import GF.Conversion.Types
import GF.Infra.Print
import Option
import Data.Char (toUpper,toLower)
gslPrinter :: Ident -- ^ Grammar name
-> Options -> CGrammar -> String
gslPrinter name opts cfg = prGSL srg ""
where srg = makeSRG name opts cfg
prGSL :: SRG -> ShowS
prGSL (SRG{grammarName=name,startCat=start,origStartCat=origStart,rules=rs})
= header . mainCat . unlinesS (map prRule rs)
where
header = showString ";GSL2.0" . nl
. comments ["Nuance speech recognition grammar for " ++ name,
"Generated by GF"] . nl . nl
mainCat = showString ("; Start category: " ++ origStart) . nl
. showString ".MAIN " . prCat start . nl . nl
prRule (SRGRule cat origCat rhs) =
showString "; " . prtS origCat . nl
. prCat cat . sp . wrap "[" (unwordsS (map prAlt rhs)) "]" . nl
prAlt rhs = wrap "(" (unwordsS (map prSymbol rhs')) ")"
where rhs' = rmPunct rhs
prSymbol (Cat c) = prCat c
prSymbol (Tok t) = wrap "\"" (showString (showToken t)) "\""
-- GSL requires an upper case letter in category names
prCat c = showString (firstToUpper c)
firstToUpper :: String -> String
firstToUpper [] = []
firstToUpper (x:xs) = toUpper x : xs
rmPunct :: [Symbol String Token] -> [Symbol String Token]
rmPunct [] = []
rmPunct (Tok t:ss) | all isPunct (prt t) = rmPunct ss
rmPunct (s:ss) = s : rmPunct ss
-- Nuance does not like upper case characters in tokens
showToken :: Token -> String
showToken t = map toLower (prt t)
isPunct :: Char -> Bool
isPunct c = c `elem` "-_.;.,?!()[]{}"
comments :: [String] -> ShowS
comments = unlinesS . map (showString . ("; " ++))
|
