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|
(* $Id$ *)
{
open Util
type error =
| Illegal_character
| Unterminated_comment
| Unterminated_string
exception Error of error * int * int
let add_keyword,is_keyword =
let table = Hashtbl.create 149 in
List.iter (fun kw -> Hashtbl.add table kw ())
[ "Grammar"; "Syntax"; "Quit"; "Load"; "Compile";
"of"; "with"; "end"; "as"; "in"; "using";
"Cases"; "Fixpoint"; "CoFixpoint";
"Definition"; "Inductive"; "CoInductive";
"Theorem"; "Variable"; "Axiom"; "Parameter"; "Hypothesis";
"Orelse"; "Proof"; "Qed";
"Prop"; "Set"; "Type" ];
(fun s -> Hashtbl.add table s ()),
(fun s -> try Hashtbl.find table s; true with Not_found -> false)
let char_for_backslash =
match Sys.os_type with
| "Unix" | "Win32" ->
begin function
| 'n' -> '\010'
| 'r' -> '\013'
| 'b' -> '\008'
| 't' -> '\009'
| c -> c
end
| "MacOS" ->
begin function
| 'n' -> '\013'
| 'r' -> '\010'
| 'b' -> '\008'
| 't' -> '\009'
| c -> c
end
| x -> error "Lexer: unknown system type"
let char_for_decimal_code lexbuf i =
let c = 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) in
Char.chr(c land 0xFF)
let string_buffer = Buffer.create 80
let string_start_pos = ref 0
let comment_depth = ref 0
let comment_start_pos = ref 0
}
let blank = [' ' '\010' '\013' '\009' '\012']
let firstchar =
['A'-'Z' 'a'-'z' '\192'-'\214' '\216'-'\246' '\248'-'\255']
let identchar =
['A'-'Z' 'a'-'z' '_' '\192'-'\214' '\216'-'\246' '\248'-'\255' '\'' '0'-'9']
let symbolchar =
['!' '$' '%' '&' '*' '+' '-' '<' '>' '/' ':' '=' '?' '@' '^' '|' '~']
let decimal_literal = ['0'-'9']+
let hex_literal = '0' ['x' 'X'] ['0'-'9' 'A'-'F' 'a'-'f']+
let oct_literal = '0' ['o' 'O'] ['0'-'7']+
let bin_literal = '0' ['b' 'B'] ['0'-'1']+
rule token = parse
| blank+
{ token lexbuf }
| firstchar identchar*
{ let s = Lexing.lexeme lexbuf in
if is_keyword s then ("",s) else ("IDENT",s) }
| decimal_literal | hex_literal | oct_literal | bin_literal
{ ("INT", Lexing.lexeme lexbuf) }
| "(" | ")" | "[" | "]" | "{" | "}" | "<" | ">" | "." | "_"
{ ("", Lexing.lexeme lexbuf) }
| symbolchar+
{ ("", Lexing.lexeme lexbuf) }
| '`' [^'`']* '`'
{ let s = Lexing.lexeme lexbuf in
("QUOTED", String.sub s 1 (String.length s - 2)) }
| "\""
{ Buffer.reset string_buffer;
let string_start = Lexing.lexeme_start lexbuf in
string_start_pos := string_start;
string lexbuf;
("STRING", Buffer.contents string_buffer) }
| "(*"
{ comment_depth := 1;
comment_start_pos := Lexing.lexeme_start lexbuf;
comment lexbuf;
token lexbuf }
| eof
{ ("EOI","") }
and comment = parse
| "(*"
{ comment_depth := succ !comment_depth; comment lexbuf }
| "*)"
{ comment_depth := pred !comment_depth;
if !comment_depth > 0 then comment lexbuf }
| "\""
{ Buffer.reset string_buffer;
string_start_pos := Lexing.lexeme_start lexbuf;
string lexbuf;
comment lexbuf }
| "''"
{ comment lexbuf }
| "'" [^ '\\' '\''] "'"
{ comment lexbuf }
| "'\\" ['\\' '\'' 'n' 't' 'b' 'r'] "'"
{ comment lexbuf }
| "'\\" ['0'-'9'] ['0'-'9'] ['0'-'9'] "'"
{ comment lexbuf }
| eof
{ raise (Error (Unterminated_comment,
!comment_start_pos, !comment_start_pos+2)) }
| _
{ comment lexbuf }
and string = parse
| '"'
{ () }
| '\\' ("\010" | "\013" | "\013\010") [' ' '\009'] *
{ string lexbuf }
| '\\' ['\\' '"' 'n' 't' 'b' 'r']
{ let c = char_for_backslash (Lexing.lexeme_char lexbuf 1) in
Buffer.add_char string_buffer c;
string lexbuf }
| '\\' ['0'-'9'] ['0'-'9'] ['0'-'9']
{ Buffer.add_char string_buffer (char_for_decimal_code lexbuf 1);
string lexbuf }
| eof
{ raise (Error (Unterminated_string,
!string_start_pos, !string_start_pos+1)) }
| _
{ Buffer.add_char string_buffer (Lexing.lexeme_char lexbuf 0);
string lexbuf }
{
let create_loc_table () = ref (Array.create 1024 None)
let find_loc t i =
if i < 0 || i >= Array.length !t then invalid_arg "find_loc";
match Array.unsafe_get !t i with
| None -> invalid_arg "find_loc"
| Some l -> l
let add_loc t i l =
while i >= Array.length !t do
let new_t = Array.create (2 * Array.length !t) None in
Array.blit !t 0 new_t 0 (Array.length !t);
t := new_t
done;
!t.(i) <- Some l
let func cs =
let loct = create_loc_table () in
let lexbuf =
Lexing.from_function
(fun s _ -> match cs with parser
| [< 'c >] -> String.unsafe_set s 0 c; 1
| [< >] -> 0)
in
let next_token i =
let tok = token lexbuf in
let loc = (Lexing.lexeme_start lexbuf, Lexing.lexeme_end lexbuf) in
add_loc loct i loc; Some tok
in
let ts = Stream.from next_token in
(ts, find_loc loct)
let add_token = function
| ("",kw) -> add_keyword kw
| _ -> ()
let token_text = function
| ("", t) -> "'" ^ t ^ "'"
| ("IDENT", "") -> "identifier"
| ("IDENT", t) -> "'" ^ t ^ "'"
| ("INT", "") -> "integer"
| ("INT", s) -> "'" ^ s ^ "'"
| ("STRING", "") -> "string"
| ("EOI", "") -> "end of input"
| (con, "") -> con
| (con, prm) -> con ^ " \"" ^ prm ^ "\""
let tparse (p_con, p_prm) =
if p_prm = "" then
parser [< '(con, prm) when con = p_con >] -> prm
else
parser [< '(con, prm) when con = p_con && prm = p_prm >] -> prm
}
|
