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
|
--
-- Haddock - A Haskell Documentation Tool
--
-- (c) Simon Marlow 2002
--
{
module HaddockLex (
Token(..),
tokenise
) where
import Char
import HsSyn
import HsLexer hiding (Token)
import HsParseMonad
import Debug.Trace
}
$ws = $white # \n
$digit = [0-9]
$special = [\"\@\/]
$alphanum = [A-Za-z0-9]
$ident = [$alphanum \_\.\!\#\$\%\&\*\+\/\<\=\>\?\@\\\\\^\|\-\~]
:-
-- beginning of a paragraph
<0,para> {
$ws* \n ;
$ws* \> { begin birdtrack }
$ws* [\*\-] { token TokBullet }
$ws* \( $digit+ \) { token TokNumber }
$ws* { begin string }
}
-- beginning of a line
<line> {
$ws* \> { begin birdtrack }
$ws* \n { token TokPara `andBegin` para }
$ws* { begin string }
}
<birdtrack> .* \n? { strtoken TokBirdTrack `andBegin` line }
<string> {
$special { strtoken $ \s -> TokSpecial (head s) }
\<.*\> { strtoken $ \s -> TokURL (init (tail s)) }
\#.*\# { strtoken $ \s -> TokAName (init (tail s)) }
[\'\`] $ident+ [\'\`] { ident }
\\ . { strtoken (TokString . tail) }
-- allow special characters through if they don't fit one of the previous
-- patterns.
[\'\`\<\#\\] { strtoken TokString }
[^ $special \< \# \n \'\` \\]* \n { strtoken TokString `andBegin` line }
[^ $special \< \# \n \'\` \\]+ { strtoken TokString }
}
{
data Token
= TokPara
| TokNumber
| TokBullet
| TokSpecial Char
| TokIdent [HsQName]
| TokString String
| TokURL String
| TokAName String
| TokBirdTrack String
deriving Show
-- -----------------------------------------------------------------------------
-- Alex support stuff
type StartCode = Int
type Action = String -> StartCode -> (StartCode -> [Token]) -> [Token]
type AlexInput = (Char,String)
alexGetChar (_, []) = Nothing
alexGetChar (_, c:cs) = Just (c, (c,cs))
alexInputPrevChar (c,_) = c
tokenise :: String -> [Token]
tokenise str = let toks = go ('\n',str) para in {-trace (show toks)-} toks
where go inp@(_,str) sc =
case alexScan inp sc of
AlexEOF -> []
AlexError _ -> error "lexical error"
AlexSkip inp' len -> go inp' sc
AlexToken inp' len act -> act (take len str) sc (\sc -> go inp' sc)
andBegin :: Action -> StartCode -> Action
andBegin act new_sc = \str sc cont -> act str new_sc cont
token :: Token -> Action
token t = \str sc cont -> t : cont sc
strtoken :: (String -> Token) -> Action
strtoken t = \str sc cont -> t str : cont sc
begin :: StartCode -> Action
begin sc = \str _ cont -> cont sc
-- -----------------------------------------------------------------------------
-- Lex a string as a Haskell identifier
ident :: Action
ident str sc cont =
case strToHsQNames id of
Just names -> TokIdent names : cont sc
Nothing -> TokString str : cont sc
where id = init (tail str)
strToHsQNames :: String -> Maybe [HsQName]
strToHsQNames str0
= case lexer (\t -> returnP t) str0 (SrcLoc 1 1) 1 1 [] of
Ok _ (VarId str)
-> Just [ UnQual (HsVarName (HsIdent str)) ]
Ok _ (QVarId (mod0,str))
-> Just [ Qual (Module mod0) (HsVarName (HsIdent str)) ]
Ok _ (ConId str)
-> Just [ UnQual (HsTyClsName (HsIdent str)),
UnQual (HsVarName (HsIdent str)) ]
Ok _ (QConId (mod0,str))
-> Just [ Qual (Module mod0) (HsTyClsName (HsIdent str)),
Qual (Module mod0) (HsVarName (HsIdent str)) ]
Ok _ (VarSym str)
-> Just [ UnQual (HsVarName (HsSymbol str)) ]
Ok _ (ConSym str)
-> Just [ UnQual (HsTyClsName (HsSymbol str)),
UnQual (HsVarName (HsSymbol str)) ]
Ok _ (QVarSym (mod0,str))
-> Just [ Qual (Module mod0) (HsVarName (HsSymbol str)) ]
Ok _ (QConSym (mod0,str))
-> Just [ Qual (Module mod0) (HsTyClsName (HsSymbol str)),
Qual (Module mod0) (HsVarName (HsSymbol str)) ]
_other
-> Nothing
}
|
