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
|
{-# OPTIONS -fno-warn-incomplete-patterns #-}
module GF.Canon.GFCC.PrintGFCC where
-- pretty-printer generated by the BNF converter
import GF.Canon.GFCC.AbsGFCC
import Char
-- the top-level printing method
printTree :: Print a => a -> String
printTree = render . prt 0
type Doc = [ShowS] -> [ShowS]
doc :: ShowS -> Doc
doc = (:)
render :: Doc -> String
render d = rend 0 (map ($ "") $ d []) "" where
rend i ss = case ss of
"[" :ts -> showChar '[' . rend i ts
"(" :ts -> showChar '(' . rend i ts
"{" :ts -> showChar '{' . new (i+1) . rend (i+1) ts
"}" : ";":ts -> new (i-1) . space "}" . showChar ';' . new (i-1) . rend (i-1) ts
"}" :ts -> new (i-1) . showChar '}' . new (i-1) . rend (i-1) ts
";" :ts -> showChar ';' . new i . rend i ts
t : "," :ts -> showString t . space "," . rend i ts
t : ")" :ts -> showString t . showChar ')' . rend i ts
t : "]" :ts -> showString t . showChar ']' . rend i ts
t :ts -> space t . rend i ts
_ -> id
new i = showChar '\n' . replicateS (2*i) (showChar ' ') . dropWhile isSpace
space t = showString t ---- . (\s -> if null s then "" else (' ':s))
parenth :: Doc -> Doc
parenth ss = doc (showChar '(') . ss . doc (showChar ')')
concatS :: [ShowS] -> ShowS
concatS = foldr (.) id
concatD :: [Doc] -> Doc
concatD = foldr (.) id
replicateS :: Int -> ShowS -> ShowS
replicateS n f = concatS (replicate n f)
-- the printer class does the job
class Print a where
prt :: Int -> a -> Doc
prtList :: [a] -> Doc
prtList = concatD . map (prt 0)
instance Print a => Print [a] where
prt _ = prtList
instance Print Char where
prt _ s = doc (showChar '\'' . mkEsc '\'' s . showChar '\'')
prtList s = doc (showChar '"' . concatS (map (mkEsc '"') s) . showChar '"')
mkEsc :: Char -> Char -> ShowS
mkEsc q s = case s of
_ | s == q -> showChar '\\' . showChar s
'\\'-> showString "\\\\"
'\n' -> showString "\\n"
'\t' -> showString "\\t"
_ -> showChar s
prPrec :: Int -> Int -> Doc -> Doc
prPrec i j = if j<i then parenth else id
instance Print Integer where
prt _ x = doc (shows x)
instance Print Int where
prt _ x = doc (shows x)
instance Print Double where
prt _ x = doc (shows x)
instance Print CId where
prt _ (CId i) = doc (showString i)
prtList es = case es of
[] -> (concatD [])
[x] -> (concatD [prt 0 x])
x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
instance Print Grammar where
prt i e = case e of
Grm header abstract concretes -> prPrec i 0 (concatD [prt 0 header , doc (showString ";") , prt 0 abstract , doc (showString ";") , prt 0 concretes])
instance Print Header where
prt i e = case e of
Hdr cid cids -> prPrec i 0 (concatD [doc (showString "grammar ") , prt 0 cid , doc (showString "(") , prt 0 cids , doc (showString ")")])
instance Print Abstract where
prt i e = case e of
Abs absdefs -> prPrec i 0 (concatD [doc (showString "abstract ") , doc (showString "{") , prt 0 absdefs , doc (showString "}")])
instance Print Concrete where
prt i e = case e of
Cnc cid cncdefs -> prPrec i 0 (concatD [doc (showString "concrete ") , prt 0 cid , doc (showString "{") , prt 0 cncdefs , doc (showString "}")])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
instance Print AbsDef where
prt i e = case e of
Fun cid type' exp -> prPrec i 0 (concatD [prt 0 cid , doc (showString ":") , prt 0 type' , doc (showString "=") , prt 0 exp])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
instance Print CncDef where
prt i e = case e of
Lin cid term -> prPrec i 0 (concatD [prt 0 cid , doc (showString "=") , prt 0 term])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
instance Print Type where
prt i e = case e of
Typ cids cid -> prPrec i 0 (concatD [prt 0 cids , doc (showString "->") , prt 0 cid])
instance Print Exp where
prt i e = case e of
Tr atom exps -> prPrec i 0 (concatD [doc (showString "(") , prt 0 atom , prt 0 exps , doc (showString ")")])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , prt 0 xs])
instance Print Atom where
prt i e = case e of
AC cid -> prPrec i 0 (concatD [prt 0 cid])
AS str -> prPrec i 0 (concatD [prt 0 str])
AI n -> prPrec i 0 (concatD [prt 0 n])
AF d -> prPrec i 0 (concatD [prt 0 d])
AM -> prPrec i 0 (concatD [doc (showString "?")])
instance Print Term where
prt i e = case e of
R terms -> prPrec i 0 (concatD [doc (showString "[") , prt 0 terms , doc (showString "]")])
P term0 term -> prPrec i 0 (concatD [doc (showString "(") , prt 0 term0 , doc (showString "!") , prt 0 term , doc (showString ")")])
S terms -> prPrec i 0 (concatD [doc (showString "(") , prt 0 terms , doc (showString ")")])
K tokn -> prPrec i 0 (concatD [prt 0 tokn])
V n -> prPrec i 0 (concatD [doc (showString "$") , prt 0 n])
C n -> prPrec i 0 (concatD [prt 0 n])
F cid -> prPrec i 0 (concatD [prt 0 cid])
FV terms -> prPrec i 0 (concatD [doc (showString "[|") , prt 0 terms , doc (showString "|]")])
W str term -> prPrec i 0 (concatD [doc (showString "(") , prt 0 str , doc (showString "+") , prt 0 term , doc (showString ")")])
RP term0 term -> prPrec i 0 (concatD [doc (showString "(") , prt 0 term0 , doc (showString "@") , prt 0 term , doc (showString ")")])
TM -> prPrec i 0 (concatD [doc (showString "?")])
L cid term -> prPrec i 0 (concatD [doc (showString "(") , prt 0 cid , doc (showString "->") , prt 0 term , doc (showString ")")])
BV cid -> prPrec i 0 (concatD [doc (showString "#") , prt 0 cid])
prtList es = case es of
[] -> (concatD [])
[x] -> (concatD [prt 0 x])
x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
instance Print Tokn where
prt i e = case e of
KS str -> prPrec i 0 (concatD [prt 0 str])
KP strs variants -> prPrec i 0 (concatD [doc (showString "[") , doc (showString "pre") , prt 0 strs , doc (showString "[") , prt 0 variants , doc (showString "]") , doc (showString "]")])
instance Print Variant where
prt i e = case e of
Var strs0 strs -> prPrec i 0 (concatD [prt 0 strs0 , doc (showString "/") , prt 0 strs])
prtList es = case es of
[] -> (concatD [])
[x] -> (concatD [prt 0 x])
x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
|
