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
|
(*************************************************************************)
(* *)
(* Objective Caml LablTk library *)
(* *)
(* Francois Rouaix, Francois Pessaux and Jun Furuse *)
(* projet Cristal, INRIA Rocquencourt *)
(* Jacques Garrigue, Kyoto University RIMS *)
(* *)
(* Copyright 1999 Institut National de Recherche en Informatique et *)
(* en Automatique and Kyoto University. All rights reserved. *)
(* This file is distributed under the terms of the GNU Library *)
(* General Public License. *)
(* *)
(*************************************************************************)
(* $Id$ *)
{
open StdLabels
open Lexing
open Parser
open Support
exception Lexical_error of string
let current_line = ref 1
(* The table of keywords *)
let keyword_table = (Hashtbl.create 149 : (string, token) Hashtbl.t)
let _ = List.iter
~f:(fun (str,tok) -> Hashtbl'.add keyword_table ~key:str ~data:tok)
[
"int", TYINT;
"float", TYFLOAT;
"bool", TYBOOL;
"char", TYCHAR;
"string", TYSTRING;
"list", LIST;
"as", AS;
"variant", VARIANT;
"widget", WIDGET;
"option", OPTION;
"type", TYPE;
"subtype", SUBTYPE;
"function", FUNCTION;
"module", MODULE;
"external", EXTERNAL;
"sequence", SEQUENCE;
"unsafe", UNSAFE
]
(* To buffer string literals *)
let initial_string_buffer = String.create 256
let string_buff = ref initial_string_buffer
let string_index = ref 0
let reset_string_buffer () =
string_buff := initial_string_buffer;
string_index := 0;
()
let store_string_char c =
if !string_index >= String.length (!string_buff) then begin
let new_buff = String.create (String.length (!string_buff) * 2) in
String.blit ~src:(!string_buff) ~src_pos:0 ~dst:new_buff ~dst_pos:0
~len:(String.length (!string_buff));
string_buff := new_buff
end;
String.set (!string_buff) (!string_index) c;
incr string_index
let get_stored_string () =
let s = String.sub (!string_buff) ~pos:0 ~len:(!string_index) in
string_buff := initial_string_buffer;
s
(* To translate escape sequences *)
let char_for_backslash = function
'n' -> '\010'
| 'r' -> '\013'
| 'b' -> '\008'
| 't' -> '\009'
| c -> c
let char_for_decimal_code lexbuf i =
Char.chr(100 * (Char.code(Lexing.lexeme_char lexbuf i) - 48) +
10 * (Char.code(Lexing.lexeme_char lexbuf (i+1)) - 48) +
(Char.code(Lexing.lexeme_char lexbuf (i+2)) - 48))
let saved_string_start = ref 0
}
rule main = parse
'\010' { incr current_line; main lexbuf }
| [' ' '\013' '\009' '\026' '\012'] +
{ main lexbuf }
| ['A'-'Z' 'a'-'z' '\192'-'\214' '\216'-'\246' '\248'-'\255' ]
( '_' ? ['A'-'Z' 'a'-'z' '\192'-'\214' '\216'-'\246' '\248'-'\255' (*'*) '0'-'9' ] ) *
{ let s = Lexing.lexeme lexbuf in
try
Hashtbl.find keyword_table s
with Not_found ->
IDENT s }
| "\""
{ reset_string_buffer();
(* Start of token is start of string. *)
saved_string_start := lexbuf.lex_start_pos;
string lexbuf;
lexbuf.lex_start_pos <- !saved_string_start;
STRING (get_stored_string()) }
| "(" { LPAREN }
| ")" { RPAREN }
| "[" { LBRACKET }
| "]" { RBRACKET }
| "{" { LBRACE }
| "}" { RBRACE }
| "," { COMMA }
| ";" { SEMICOLON }
| ":" {COLON}
| "?" {QUESTION}
| "#" { comment lexbuf; main lexbuf }
| eof { EOF }
| _
{ raise (Lexical_error("illegal character")) }
and string = parse
'"'
{ () }
| '\\' [' ' '\010' '\013' '\009' '\026' '\012'] +
{ string lexbuf }
| '\\' ['\\' '"' 'n' 't' 'b' 'r']
{ store_string_char(char_for_backslash(Lexing.lexeme_char lexbuf 1));
string lexbuf }
| '\\' ['0'-'9'] ['0'-'9'] ['0'-'9']
{ store_string_char(char_for_decimal_code lexbuf 1);
string lexbuf }
| eof
{ raise (Lexical_error("string not terminated")) }
| '\010'
{ incr current_line;
store_string_char(Lexing.lexeme_char lexbuf 0);
string lexbuf }
| _
{ store_string_char(Lexing.lexeme_char lexbuf 0);
string lexbuf }
and comment = parse
'\010' { incr current_line }
| eof { () }
| _ { comment lexbuf }
|
