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
|
definition
module Main
imports Fix
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Top level syntax.
module Fix
imports Fix-Exprs Fix-Layout
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Expressions.
module Fix-Exprs
imports Fix-Lexicals URI
exports
sorts Expr Bind Formal
context-free syntax
Id -> Expr {cons("Var")}
Int -> Expr {cons("Int")}
Str -> Expr {cons("Str")}
Uri -> Expr {cons("Uri")}
Path -> Expr {cons("Path")}
"(" Expr ")" -> Expr {bracket}
Expr Expr -> Expr {cons("Call"), left}
"{" {Formal ","}* "}" ":" Expr -> Expr {cons("Function"), right}
Id -> Formal {cons("NoDefFormal")}
Id "?" Expr -> Formal {cons("DefFormal")}
"assert" Expr ";" Expr -> Expr {cons("Assert"), right}
"rec" "{" Binds "}" -> Expr {cons("Rec")}
"let" "{" Binds "}" -> Expr {cons("LetRec")}
"{" Binds "}" -> Expr {cons("Attrs")}
Id "=" Expr -> Bind {cons("Bind")}
{Bind ";"}* -> Binds
Bind ";" -> BindSemi
BindSemi* -> Binds
"[" ExprList "]" -> Expr {cons("List")}
"" -> ExprList {cons("ExprNil")}
Expr ExprList -> ExprList {cons("ExprCons")}
Expr "." Id -> Expr {cons("Select")}
"if" Expr "then" Expr "else" Expr -> Expr {cons("If")}
Expr "==" Expr -> Expr {cons("OpEq"), non-assoc}
Expr "!=" Expr -> Expr {cons("OpNEq"), non-assoc}
"!" Expr -> Expr {cons("OpNot")}
Expr "&&" Expr -> Expr {cons("OpAnd"), right}
Expr "||" Expr -> Expr {cons("OpOr"), right}
Expr "->" Expr -> Expr {cons("OpImpl"), right}
Bool -> Expr {cons("Bool")}
context-free priorities
Expr "." Id -> Expr
> Expr ExprList -> ExprList
> Expr Expr -> Expr
> "!" Expr -> Expr
> Expr "==" Expr -> Expr
> Expr "!=" Expr -> Expr
> Expr "&&" Expr -> Expr
> Expr "||" Expr -> Expr
> Expr "->" Expr -> Expr
> "assert" Expr ";" Expr -> Expr
> "{" {Formal ","}* "}" ":" Expr -> Expr
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Lexical syntax.
module Fix-Lexicals
exports
sorts Id Path
lexical syntax
[a-zA-Z\_][a-zA-Z0-9\_\']* -> Id
"rec" -> Id {reject}
"let" -> Id {reject}
"if" -> Id {reject}
"then" -> Id {reject}
"else" -> Id {reject}
"true" -> Id {reject}
"false" -> Id {reject}
"assert" -> Id {reject}
[0-9]+ -> Int
"\"" ~[\n\"]* "\"" -> Str
PathComp ("/" PathComp)+ -> Path
[a-zA-Z0-9\.\_\-\+]+ -> PathComp
"true" -> Bool
"false" -> Bool
lexical restrictions
Id -/- [a-zA-Z0-9\_\']
Int -/- [0-9]
Path -/- [a-zA-Z0-9\.\_\-\+\/]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% URIs (RFC 2396, appendix A).
module URI
exports
sorts Uri
lexical syntax
Uscheme ":" (Uhierpath | Uopaquepath) -> Uri
(Unetpath | Uabspath) ("?" Uquery)? -> Uhierpath
Uuricnoslash Uuric* -> Uopaquepath
Uunreserved | Uescaped | [\;\?\:\@\&\=\+\$\,] -> Uuricnoslash
"//" Uauthority Uabspath? -> Unetpath
"/" Upathsegments -> Uabspath
"//" Uuric* -> Uabspath {reject}
Urelsegment Uabspath? -> Urelpath
(Uunreserved | Uescaped | [\;\@\&\=\+\$\,])+ -> Urelsegment
Ualpha (Ualpha | Udigit | [\+\-\.])* -> Uscheme
Userver | Uregname -> Uauthority
(Uunreserved | Uescaped | [\$\,\;\:\@\&\=\+])+ -> Uregname
((Uuserinfo "@") Uhostport) -> Userver
(Uunreserved | Uescaped | [\;\:\&\=\+\$\,])* -> Uuserinfo
Uhost (":" Uport)? -> Uhostport
Uhostname | UIPv4address -> Uhost
(Udomainlabel ".")+ Utoplabel "."? -> Uhostname
Ualphanum | Ualphanum (Ualphanum | "-")* Ualphanum -> Udomainlabel
Ualpha | Ualpha (Ualphanum | "-")* Ualphanum -> Utoplabel
Udigit+ "." Udigit+ "." Udigit+ "." Udigit+ -> UIPv4address
Udigit* -> Uport
Uabspath | Uopaquepart -> Upath
Usegment ("/" Usegment)* -> Upathsegments
Upchar* (";" Uparam)* -> Usegment
Upchar* -> Uparam
Uunreserved | Uescaped | [\:\@\&\=\+\$\,] -> Upchar
Uuric* -> Uquery
Uuric* -> Ufragment
Ureserved | Uunreserved | Uescaped -> Uuric
[\;\/\?\:\@\&\=\+\$\,] -> Ureserved
Ualphanum | Umark -> Uunreserved
[\-\_\.\!\~\*\'\(\)] -> Umark
"%" Uhex Uhex -> Uescaped
Udigit | [A-Fa-f] -> Uhex
Ualpha | Udigit -> Ualphanum
Ulowalpha | Uupalpha -> Ualpha
[a-z] -> Ulowalpha
[A-Z] -> Uupalpha
[0-9] -> Udigit
lexical restrictions
Uri -/- [a-zA-Z0-9\-\_\.\!\~\*\'\(\)]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Layout.
module Fix-Layout
exports
lexical syntax
[\ \t\n] -> LAYOUT
HashComment -> LAYOUT
Comment -> LAYOUT
"#" ~[\n]* [\n] -> HashComment
"//" ~[\n]* [\n] -> HashComment
"/*" ( ~[\*] | Asterisk )* "*/" -> Comment
[\*] -> Asterisk
lexical restrictions
Asterisk -/- [\/]
context-free restrictions
LAYOUT? -/- [\ \t\n] | [\#]
syntax
HashComment <START> -> <START>
|
