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|
(**************************************************************************)
(* Sail *)
(* *)
(* Copyright (c) 2013-2017 *)
(* Kathyrn Gray *)
(* Shaked Flur *)
(* Stephen Kell *)
(* Gabriel Kerneis *)
(* Robert Norton-Wright *)
(* Christopher Pulte *)
(* Peter Sewell *)
(* *)
(* All rights reserved. *)
(* *)
(* This software was developed by the University of Cambridge Computer *)
(* Laboratory as part of the Rigorous Engineering of Mainstream Systems *)
(* (REMS) project, funded by EPSRC grant EP/K008528/1. *)
(* *)
(* Redistribution and use in source and binary forms, with or without *)
(* modification, are permitted provided that the following conditions *)
(* are met: *)
(* 1. Redistributions of source code must retain the above copyright *)
(* notice, this list of conditions and the following disclaimer. *)
(* 2. Redistributions in binary form must reproduce the above copyright *)
(* notice, this list of conditions and the following disclaimer in *)
(* the documentation and/or other materials provided with the *)
(* distribution. *)
(* *)
(* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' *)
(* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *)
(* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *)
(* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR *)
(* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, *)
(* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *)
(* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF *)
(* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND *)
(* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, *)
(* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT *)
(* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF *)
(* SUCH DAMAGE. *)
(**************************************************************************)
{
open Pre_parser
module M = Map.Make(String)
exception LexError of string * Lexing.position
let r = fun s -> s (* Ulib.Text.of_latin1 *)
(* Available as Scanf.unescaped since OCaml 4.0 but 3.12 is still common *)
let unescaped s = Scanf.sscanf ("\"" ^ s ^ "\"") "%S%!" (fun x -> x)
let kw_table =
List.fold_left
(fun r (x,y) -> M.add x y r)
M.empty
[
("and", (fun _ -> Other));
("as", (fun _ -> Other));
("bits", (fun _ -> Other));
("by", (fun _ -> Other));
("case", (fun _ -> Other));
("clause", (fun _ -> Other));
("const", (fun _ -> Other));
("dec", (fun _ -> Other));
("default", (fun _ -> Other));
("deinfix", (fun _ -> Other));
("effect", (fun _ -> Other));
("Effects", (fun _ -> Other));
("end", (fun _ -> Other));
("enumerate", (fun _ -> Other));
("else", (fun _ -> Other));
("extern", (fun _ -> Other));
("false", (fun _ -> Other));
("forall", (fun _ -> Other));
("foreach", (fun _ -> Other));
("function", (fun x -> Other));
("if", (fun x -> Other));
("in", (fun x -> Other));
("IN", (fun x -> Other));
("Inc", (fun x -> Other));
("let", (fun x -> Other));
("member", (fun x -> Other));
("Nat", (fun x -> Other));
("Order", (fun x -> Other));
("pure", (fun x -> Other));
("rec", (fun x -> Other));
("register", (fun x -> Other));
("return", (fun x -> Other));
("scattered", (fun x -> Other));
("struct", (fun x -> Other));
("sizeof", (fun x -> Other));
("switch", (fun x -> Other));
("then", (fun x -> Other));
("true", (fun x -> Other));
("Type", (fun x -> Other));
("typedef", (fun x -> Typedef));
("def", (fun x -> Def));
("undefined", (fun x -> Other));
("union", (fun x -> Other));
("with", (fun x -> Other));
("val", (fun x -> Other));
("AND", (fun x -> Other));
("div", (fun x -> Other));
("EOR", (fun x -> Other));
("mod", (fun x -> Other));
("OR", (fun x -> Other));
("quot", (fun x -> Other));
("rem", (fun x -> Other));
]
}
let ws = [' ''\t']+
let letter = ['a'-'z''A'-'Z']
let digit = ['0'-'9']
let binarydigit = ['0'-'1']
let hexdigit = ['0'-'9''A'-'F''a'-'f']
let alphanum = letter|digit
let startident = letter|'_'
let ident = alphanum|['_''\'']
let tyvar_start = '\''
let oper_char = ['!''$''%''&''*''+''-''.''/'':''<''=''>''?''@''^''|''~']
let escape_sequence = ('\\' ['\\''\"''\'''n''t''b''r']) | ('\\' digit digit digit) | ('\\' 'x' hexdigit hexdigit)
rule token = parse
| ws
{ token lexbuf }
| "\n"
{ Lexing.new_line lexbuf;
token lexbuf }
| "2**" | "&" | "@" | "|" | "^" | ":" | "," | "." | "/" | "=" | "!" | ">" | "-" | "<" |
"+" | ";" | "*" | "~" | "_" | "{" | "}" | "(" | ")" | "[" | "]" | "&&" | "||" | "|]" | "||]" |
"^^" | "::" | ":>" | ":=" | ".." | "=/=" | "==" | "!=" | "!!" | ">=" | ">=+" | ">>" | ">>>" | ">+" |
"#>>" | "#<<" | "->" | "<:" | "<=" | "<=+" | "<>" | "<<" | "<<<" | "<+" | "**" | "~^" | ">=_s" |
">=_si" | ">=_u" | ">=_ui" | ">>_u" | ">_s" | ">_si" | ">_u" | ">_ui" | "<=_s" | "<=_si" |
"<=_u" | "<=_ui" | "<_s" | "<_si" | "<_u" | "<_ui" | "**_s" | "**_si" | "*_u" | "*_ui"| "2^" { Other }
| "(*" { comment (Lexing.lexeme_start_p lexbuf) 0 lexbuf; token lexbuf }
| "*)" { raise (LexError("Unbalanced comment", Lexing.lexeme_start_p lexbuf)) }
| startident ident* as i { if M.mem i kw_table then
(M.find i kw_table) ()
else
Id(r i) }
| tyvar_start startident ident* { Other }
| "&" oper_char+ | "@" oper_char+ | "^" oper_char+ | "/" oper_char+ | "=" oper_char+ |
"!" oper_char+ | ">" oper_char+ | "<" oper_char+ | "+" oper_char+ | "*" oper_char+ |
"~" oper_char+ | "&&" oper_char+ | "^^" oper_char+| "::" oper_char+| "=/=" oper_char+ |
"==" oper_char+ | "!=" oper_char+ | "!!" oper_char+ | ">=" oper_char+ | ">=+" oper_char+ |
">>" oper_char+ | ">>>" oper_char+ | ">+" oper_char+ | "#>>" oper_char+ | "#<<" oper_char+ |
"<=" oper_char+ | "<=+" oper_char+ | "<<" oper_char+ | "<<<" oper_char+ | "<+" oper_char+ |
"**" oper_char+ | "~^" oper_char+ | ">=_s" oper_char+ | ">=_si" oper_char+ | ">=_u" oper_char+ |
">=_ui" oper_char+ | ">>_u" oper_char+ | ">_s" oper_char+ | ">_si" oper_char+| ">_u" oper_char+ |
">_ui" oper_char+ | "<=_s" oper_char+ | "<=_si" oper_char+ | "<=_u" oper_char+ | "<=_ui" oper_char+ |
"<_s" oper_char+ | "<_si" oper_char+ | "<_u" oper_char+ | "<_ui" oper_char+ | "**_s" oper_char+ |
"**_si" oper_char+ | "*_u" oper_char+ | "*_ui" oper_char+ | "2^" oper_char+ { Other }
| digit+ { Other }
| "0b" (binarydigit+) { Other }
| "0x" (hexdigit+) { Other }
| '"' { let _ = string (Lexing.lexeme_start_p lexbuf) (Buffer.create 10) lexbuf in Other }
| eof { Eof }
| _ as c { raise (LexError(
Printf.sprintf "Unexpected character: %c" c,
Lexing.lexeme_start_p lexbuf)) }
and comment pos depth = parse
| "(*" { comment pos (depth+1) lexbuf }
| "*)" { if depth = 0 then ()
else if depth > 0 then comment pos (depth-1) lexbuf
else assert false }
| "\n" { Lexing.new_line lexbuf;
comment pos depth lexbuf }
| '"' { ignore(string (Lexing.lexeme_start_p lexbuf) (Buffer.create 10) lexbuf);
comment pos depth lexbuf }
| _ { comment pos depth lexbuf }
| eof { raise (LexError("Unbalanced comment", pos)) }
and string pos b = parse
| ([^'"''\n''\\']*'\n' as i) { Lexing.new_line lexbuf;
Buffer.add_string b i;
string pos b lexbuf }
| ([^'"''\n''\\']* as i) { Buffer.add_string b i; string pos b lexbuf }
| escape_sequence as i { Buffer.add_string b i; string pos b lexbuf }
| '\\' '\n' ws { Lexing.new_line lexbuf; string pos b lexbuf }
| '\\' { assert false (*raise (Reporting_basic.Fatal_error (Reporting_basic.Err_syntax (pos,
"illegal backslash escape in string"*) }
| '"' { let s = unescaped(Buffer.contents b) in
(*try Ulib.UTF8.validate s; s
with Ulib.UTF8.Malformed_code ->
raise (Reporting_basic.Fatal_error (Reporting_basic.Err_syntax (pos,
"String literal is not valid utf8"))) *) s }
| eof { assert false (*raise (Reporting_basic.Fatal_error (Reporting_basic.Err_syntax (pos,
"String literal not terminated")))*) }
|
