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
|
(* Copyright (c) 2008, Adam Chlipala
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - The names of contributors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*)
(* Lexing info for Laconic/Web programs *)
type pos = int
type svalue = Tokens.svalue
type ('a,'b) token = ('a,'b) Tokens.token
type lexresult = (svalue,pos) Tokens.token
local
val commentLevel = ref 0
val commentPos = ref 0
in
fun enterComment pos =
(if !commentLevel = 0 then
commentPos := pos
else
();
commentLevel := !commentLevel + 1)
fun exitComment () =
(ignore (commentLevel := !commentLevel - 1);
!commentLevel = 0)
fun eof () =
let
val pos = ErrorMsg.lastLineStart ()
in
if !commentLevel > 0 then
ErrorMsg.errorAt' (!commentPos, !commentPos) "Unterminated comment"
else
();
Tokens.EOF (pos, pos)
end
end
val str = ref ([] : char list)
val strStart = ref 0
%%
%header (functor LacwebLexFn(structure Tokens : Lacweb_TOKENS));
%full
%s COMMENT STRING;
id = [a-z_][A-Za-z0-9_]*;
cid = [A-Z][A-Za-z0-9_]*;
ws = [\ \t\012];
intconst = [0-9]+;
realconst = [0-9]+\.[0-9]*;
%%
<INITIAL> \n => (ErrorMsg.newline yypos;
continue ());
<COMMENT> \n => (ErrorMsg.newline yypos;
continue ());
<INITIAL> {ws}+ => (lex ());
<INITIAL> "(*" => (YYBEGIN COMMENT;
enterComment yypos;
continue ());
<INITIAL> "*)" => (ErrorMsg.errorAt' (yypos, yypos) "Unbalanced comments";
continue ());
<COMMENT> "(*" => (enterComment yypos;
continue ());
<COMMENT> "*)" => (if exitComment () then YYBEGIN INITIAL else ();
continue ());
<INITIAL> "\"" => (YYBEGIN STRING; strStart := yypos; str := []; continue());
<STRING> "\\\"" => (str := #"\"" :: !str; continue());
<STRING> "\"" => (YYBEGIN INITIAL;
Tokens.STRING (String.implode (List.rev (!str)), !strStart, yypos + 1));
<STRING> "\n" => (ErrorMsg.newline yypos;
str := #"\n" :: !str; continue());
<STRING> . => (str := String.sub (yytext, 0) :: !str; continue());
<INITIAL> "(" => (Tokens.LPAREN (yypos, yypos + size yytext));
<INITIAL> ")" => (Tokens.RPAREN (yypos, yypos + size yytext));
<INITIAL> "[" => (Tokens.LBRACK (yypos, yypos + size yytext));
<INITIAL> "]" => (Tokens.RBRACK (yypos, yypos + size yytext));
<INITIAL> "{" => (Tokens.LBRACE (yypos, yypos + size yytext));
<INITIAL> "}" => (Tokens.RBRACE (yypos, yypos + size yytext));
<INITIAL> "->" => (Tokens.ARROW (yypos, yypos + size yytext));
<INITIAL> "=>" => (Tokens.DARROW (yypos, yypos + size yytext));
<INITIAL> "++" => (Tokens.PLUSPLUS (yypos, yypos + size yytext));
<INITIAL> "=" => (Tokens.EQ (yypos, yypos + size yytext));
<INITIAL> "," => (Tokens.COMMA (yypos, yypos + size yytext));
<INITIAL> ":::" => (Tokens.TCOLON (yypos, yypos + size yytext));
<INITIAL> "::" => (Tokens.DCOLON (yypos, yypos + size yytext));
<INITIAL> ":" => (Tokens.COLON (yypos, yypos + size yytext));
<INITIAL> "." => (Tokens.DOT (yypos, yypos + size yytext));
<INITIAL> "$" => (Tokens.DOLLAR (yypos, yypos + size yytext));
<INITIAL> "#" => (Tokens.HASH (yypos, yypos + size yytext));
<INITIAL> "__" => (Tokens.UNDERUNDER (yypos, yypos + size yytext));
<INITIAL> "_" => (Tokens.UNDER (yypos, yypos + size yytext));
<INITIAL> "con" => (Tokens.CON (yypos, yypos + size yytext));
<INITIAL> "type" => (Tokens.LTYPE (yypos, yypos + size yytext));
<INITIAL> "val" => (Tokens.VAL (yypos, yypos + size yytext));
<INITIAL> "fn" => (Tokens.FN (yypos, yypos + size yytext));
<INITIAL> "structure" => (Tokens.STRUCTURE (yypos, yypos + size yytext));
<INITIAL> "signature" => (Tokens.SIGNATURE (yypos, yypos + size yytext));
<INITIAL> "struct" => (Tokens.STRUCT (yypos, yypos + size yytext));
<INITIAL> "sig" => (Tokens.SIG (yypos, yypos + size yytext));
<INITIAL> "end" => (Tokens.END (yypos, yypos + size yytext));
<INITIAL> "Type" => (Tokens.TYPE (yypos, yypos + size yytext));
<INITIAL> "Name" => (Tokens.NAME (yypos, yypos + size yytext));
<INITIAL> {id} => (Tokens.SYMBOL (yytext, yypos, yypos + size yytext));
<INITIAL> {cid} => (Tokens.CSYMBOL (yytext, yypos, yypos + size yytext));
<INITIAL> {intconst} => (case Int64.fromString yytext of
SOME x => Tokens.INT (x, yypos, yypos + size yytext)
| NONE => (ErrorMsg.errorAt' (yypos, yypos)
("Expected int, received: " ^ yytext);
continue ()));
<INITIAL> {realconst} => (case Real64.fromString yytext of
SOME x => Tokens.FLOAT (x, yypos, yypos + size yytext)
| NONE => (ErrorMsg.errorAt' (yypos, yypos)
("Expected float, received: " ^ yytext);
continue ()));
<COMMENT> . => (continue());
<INITIAL> . => (ErrorMsg.errorAt' (yypos, yypos)
("illegal character: \"" ^ yytext ^ "\"");
continue ());
|
