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|
(***********************************************************************)
(* *)
(* MLTk, Tcl/Tk interface of OCaml *)
(* *)
(* Francois Rouaix, Francois Pessaux, Jun Furuse and Pierre Weis *)
(* projet Cristal, INRIA Rocquencourt *)
(* Jacques Garrigue, Kyoto University RIMS *)
(* *)
(* Copyright 2002 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, with the special exception on linking *)
(* described in file ../LICENSE. *)
(* *)
(***********************************************************************)
(* $Id$ *)
{
open StdLabels
open Lexing
open Parser
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 str 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 = Bytes.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 >= Bytes.length (!string_buff) then begin
let new_buff = Bytes.create (Bytes.length (!string_buff) * 2) in
Bytes.blit ~src:(!string_buff) ~src_pos:0 ~dst:new_buff ~dst_pos:0
~len:(Bytes.length (!string_buff));
string_buff := new_buff
end;
Bytes.set (!string_buff) (!string_index) c;
incr string_index
let get_stored_string () =
let s = Bytes.sub_string (!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}
| "/" {SLASH}
| "%" { comment lexbuf; main lexbuf }
| "##line" { line 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 }
and linenum = parse
| ['0'-'9']+ {
let next_line = int_of_string (Lexing.lexeme lexbuf) in
current_line := next_line - 1
}
| _ { raise (Lexical_error("illegal ##line directive: no line number"))}
and line = parse
| [' ' '\t']* { linenum lexbuf }
|
