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|
(*
Analysateur lexicographiquep pour maxi-C++
*)
{
open Lexing
open Parser
exception Lexing_error of string
exception End_of_file
let keywordz_l = [
"class", CLASS;
"else", ELSE;
"false", FALSE;
"for", FOR;
"if", IF;
"int", INT;
"new", NEW;
"NULL", NULL;
"public", PUBLIC;
"return", RETURN;
"this", THIS;
"true", TRUE;
"virtual", VIRTUAL;
"void", VOID;
"while", WHILE;
]
let id_or_kwd =
let h = Hashtbl.create 20 in
List.iter (fun (s, t) -> Hashtbl.add h s t) keywordz_l;
fun s ->
try Hashtbl.find h s with _ -> IDENT s
}
let digit = ['0'-'9']
let alpha = ['a'-'z' 'A'-'Z']
let ident = ('_' | alpha) ('_' | alpha | digit)*
let octal = ['0'-'7']
let hexa = ['0'-'9' 'a'-'f' 'A'-'F']
rule token = parse
| ['\n' ' ' '\t']+ { token lexbuf }
| ident as id { id_or_kwd id }
| "//" { short_comment lexbuf; token lexbuf }
| "/*" { long_comment lexbuf; token lexbuf }
| "0x" (hexa+ as n) { INTVAL(int_of_string("0x" ^ n)) }
| ['1'-'9'] digit* as n { INTVAL(int_of_string(n)) }
| '0' (octal+ as n) { INTVAL(int_of_string("0o" ^ n)) }
| "0" { INTVAL(0) }
| digit ('_' | alpha | digit)+
{ raise (Lexing_error "Missing separators") }
| "\"" { STRVAL(strval "" lexbuf) }
| "=" { ASSIGN }
| "||" { LOR }
| "&&" { LAND }
| "==" { EQ }
| "!=" { NE }
| "<" { LT }
| "<=" { LE }
| ">" { GT }
| ">=" { GE }
| "+" { PLUS }
| "-" { MINUS }
| "*" { TIMES }
| "/" { DIV }
| "%" { MOD }
| "!" { NOT }
| "++" { INCR }
| "--" { DECR }
| "&" { REF }
| "(" { LPAREN }
| ")" { RPAREN }
| "->" { RARROW }
| "." { DOT }
| ";" { SEMICOLON }
| "::" { DOUBLECOLON }
| "<<" { LFLOW }
| "{" { LBRACE }
| "}" { RBRACE }
| eof { raise End_of_file }
| _ as c
{ raise
(Lexing_error
("illegal character: " ^ String.make 1 c)) }
and strval s = parse
| "\"" { s }
| "\\\\" { strval (s ^ "\\") lexbuf }
| "\\\"" { strval (s ^ "\"") lexbuf }
| "\\n" { strval (s ^ "\n") lexbuf }
| "\\t" { strval (s ^ "\t") lexbuf }
| "\\x" (hexa hexa as x)
{ strval (s ^
(String.make 1 (char_of_int (int_of_string("0x" ^ x)))))
lexbuf }
| "\\"
{ raise (Lexing_error "Invalid escape sequence") }
| '\n' { raise (Lexing_error "Invalid character (newline) in string litteral.") }
| _ as c { strval (s ^ (String.make 1 c)) lexbuf }
| eof { raise (Lexing_error "Unfinished string") }
and short_comment = parse
| '\n' {}
| _ { short_comment lexbuf }
| eof {}
and long_comment = parse
| "*/" {}
| _ { long_comment lexbuf }
| eof { raise (Lexing_error "Unclosed comment") }
|
