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|
(* lexer.mll *)
{
open Location
open Lexing
open Parser
open Errors
exception Lexical_error of lexical_error * location;;
let comment_depth = ref 0
let keyword_table = ((Hashtbl.create 149) : (string, token) Hashtbl.t);;
List.iter (fun (str,tok) -> Hashtbl.add keyword_table str tok) [
"ram", RAM;
"rom", ROM;
"where", WHERE;
"end", END;
"true", BOOL(true);
"false", BOOL(false);
"reg", REG;
"not", NOT;
"const", CONST;
"and", AND;
"nand", NAND;
"or", OR;
"xor", XOR;
"if", IF;
"then", THEN;
"else", ELSE;
"inlined", INLINED;
"probing", PROBING
]
(* 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 incr_linenum lexbuf =
let pos = lexbuf.Lexing.lex_curr_p in
lexbuf.Lexing.lex_curr_p <- { pos with
Lexing.pos_lnum = pos.Lexing.pos_lnum + 1;
Lexing.pos_bol = pos.Lexing.pos_cnum;
}
*)
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 (!string_buff) 0 new_buff 0 (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) 0 (!string_index) in
string_buff := initial_string_buffer;
s
let char_for_backslash = function
'n' -> '\010'
| 'r' -> '\013'
| 'b' -> '\008'
| 't' -> '\009'
| c -> c
let char_for_decimal_code lexbuf i =
let c =
100 * (int_of_char(Lexing.lexeme_char lexbuf i) - 48) +
10 * (int_of_char(Lexing.lexeme_char lexbuf (i+1)) - 48) +
(int_of_char(Lexing.lexeme_char lexbuf (i+2)) - 48) in
char_of_int(c land 0xFF)
}
let newline = '\n' | '\r' '\n'
rule token = parse
| newline { new_line lexbuf; token lexbuf }
| [' ' '\t'] + { token lexbuf }
| "(" { LPAREN }
| ")" { RPAREN }
| "*" { STAR }
| "+" { PLUS }
| "&" { AND }
| "/" { SLASH }
| "<" { LESS }
| ">" { GREATER }
| "[" { LBRACKET }
| "]" { RBRACKET }
| ":" { COLON }
| ";" { SEMICOL }
| "=" { EQUAL }
| "," { COMMA }
| "-" { MINUS }
| "^" { POWER }
| "<=" { LEQ }
| "." { DOT }
| ".." { DOTDOT }
| (['A'-'Z']('_' ? ['A'-'Z' 'a'-'z' ''' '0'-'9']) * as id)
{NAME id}
| (['A'-'Z' 'a'-'z']('_' ? ['A'-'Z' 'a'-'z' ''' '0'-'9']) * as id)
{ let s = Lexing.lexeme lexbuf in
try Hashtbl.find keyword_table s
with Not_found -> NAME id }
| '0' ['b' 'B'] (['0'-'1']+ as lit)
{ BOOL_INT lit }
| ['0'-'9']+
| '0' ['x' 'X'] ['0'-'9' 'A'-'F' 'a'-'f']+
| '0' ['o' 'O'] ['0'-'7']+
{ INT (int_of_string(Lexing.lexeme lexbuf)) }
| "\""
{ reset_string_buffer();
let string_start = lexbuf.lex_start_p in
(* string_start_loc := Location.curr lexbuf; *)
string lexbuf;
lexbuf.lex_start_p <- string_start;
STRING (get_stored_string()) }
| "(*"
{ let comment_start = lexbuf.lex_curr_p in
comment_depth := 1;
begin try
comment lexbuf
with Lexical_error(Unterminated_comment, (Loc (_, comment_end))) ->
raise(Lexical_error(Unterminated_comment,
Loc (comment_start, comment_end)))
end;
token lexbuf }
| eof {EOF}
| _ {raise (Lexical_error (Illegal_character,
Loc (Lexing.lexeme_start_p lexbuf,
Lexing.lexeme_end_p lexbuf)))}
and comment = parse
"(*"
{ comment_depth := succ !comment_depth; comment lexbuf }
| "*)"
{ comment_depth := pred !comment_depth;
if !comment_depth > 0 then comment lexbuf }
| "\""
{ reset_string_buffer();
let string_start = lexbuf.lex_curr_p in
begin try
string lexbuf
with Lexical_error(Unterminated_string, Loc (_, string_end)) ->
raise(Lexical_error
(Unterminated_string, Loc (string_start, string_end)))
end;
comment lexbuf }
| "''"
{ comment lexbuf }
| "'" [^ '\\' '\''] "'"
{ comment lexbuf }
| "'" '\\' ['\\' '\'' 'n' 't' 'b' 'r'] "'"
{ comment lexbuf }
| "'" '\\' ['0'-'9'] ['0'-'9'] ['0'-'9'] "'"
{ comment lexbuf }
| eof
{ raise(Lexical_error(Unterminated_comment, Loc(dummy_pos,
Lexing.lexeme_start_p lexbuf))) }
| _
{ comment lexbuf }
and string = parse
'"'
{ () }
| '\\' ("\010" | "\013" | "\013\010") [' ' '\009'] *
{ 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(Unterminated_string, Loc (dummy_pos,
Lexing.lexeme_start_p lexbuf))) }
| _
{ store_string_char(Lexing.lexeme_char lexbuf 0);
string lexbuf }
(* eof *)
|
