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|
(* $Id: metascanner.src,v 1.4 2001/10/12 15:02:57 gerd Exp $
* ----------------------------------------------------------------------
*
*)
open Metatoken;;
let scan ch =
let buf = Lexing.from_channel ch in
let rec next line pos0 =
let t = Meta.token buf in
match t with
Space -> next line pos0
| Newline -> next (line + 1) (Lexing.lexeme_end buf)
| Eof ->
let pos = Lexing.lexeme_start buf - pos0 in
Stream.lsing (fun _ -> line, pos, Eof)
| _ ->
let pos = Lexing.lexeme_start buf - pos0 in
Stream.lcons (fun _ -> line, pos, t)
(Stream.slazy (fun _ -> next line pos0))
in
next 1 0
;;
let parse ch =
let rec mk_set l =
match l with
x :: l' -> if List.mem x l' then mk_set l' else x :: mk_set l'
| [] -> []
in
let rec parse_all stream =
let (strm__ : _ Stream.t) = stream in
match Stream.peek strm__ with
Some (line, col, Name n) ->
Stream.junk strm__;
let props =
try parse_properties strm__ with
Stream.Failure ->
raise
(Stream.Error
("Error in 'name = value' clause in line " ^
string_of_int line ^ " position " ^ string_of_int col))
in
let rest =
try parse_all strm__ with
Stream.Failure ->
raise
(Stream.Error
("Error in 'name = value' clause in line " ^
string_of_int line ^ " position " ^ string_of_int col))
in
let (args, value) = props in
(n, (Sort.list ( <= ) (mk_set args), value)) :: rest
| Some (_, _, Eof) -> Stream.junk strm__; []
| Some (line, col, _) ->
Stream.junk strm__;
raise
(Stream.Error
("Expected 'name = value' clause in line " ^
string_of_int line ^ " position " ^ string_of_int col))
| _ -> raise Stream.Failure
and parse_properties stream =
let (strm__ : _ Stream.t) = stream in
match Stream.peek strm__ with
Some (line, col, LParen) ->
Stream.junk strm__;
begin match Stream.peek strm__ with
Some (line1, col1, Name n) ->
Stream.junk strm__;
let args =
try parse_arguments strm__ with
Stream.Failure -> raise (Stream.Error "")
in
begin match Stream.peek strm__ with
Some (line2, col2, Equal) ->
Stream.junk strm__;
begin match Stream.peek strm__ with
Some (line3, col3, String s) ->
Stream.junk strm__; n :: args, s
| _ ->
raise
(Stream.Error
("Expected string constant after '=' in line " ^
string_of_int line2 ^ " position " ^
string_of_int col2))
end
| _ ->
raise
(Stream.Error
("'=' expected after '(arguments)' clause in line " ^
string_of_int line ^ " position " ^
string_of_int col))
end
| _ ->
raise
(Stream.Error
("After a '(' there must be an argument name in line " ^
string_of_int line ^ " position " ^ string_of_int col))
end
| Some (line, col, Equal) ->
Stream.junk strm__;
begin match Stream.peek strm__ with
Some (_, _, String s) -> Stream.junk strm__; [], s
| _ ->
raise
(Stream.Error
("'=' must be followed by a string constant in line " ^
string_of_int line ^ " position " ^ string_of_int col))
end
| Some (line, col, _) ->
Stream.junk strm__;
raise
(Stream.Error
("Expected a '=' or a '(arguments,...)=' clause in line " ^
string_of_int line ^ " position " ^ string_of_int col))
| _ -> raise Stream.Failure
and parse_arguments stream =
let (strm__ : _ Stream.t) = stream in
match Stream.peek strm__ with
Some (line, col, Comma) ->
Stream.junk strm__;
begin match Stream.peek strm__ with
Some (line1, col1, Name n) ->
Stream.junk strm__;
let args =
try parse_arguments strm__ with
Stream.Failure -> raise (Stream.Error "")
in
n :: args
| _ ->
raise
(Stream.Error
("Expected argument name after ',' in line " ^
string_of_int line ^ " position " ^ string_of_int col))
end
| Some (_, _, RParen) -> Stream.junk strm__; []
| Some (line, col, _) ->
Stream.junk strm__;
raise
(Stream.Error
("Another argument or a ')' expected in line " ^
string_of_int line ^ " position " ^ string_of_int col))
| _ -> raise Stream.Failure
in
let rec check l =
match l with
[] -> ()
| (n, (args, value)) :: l' ->
List.iter
(fun (n', (args', value')) ->
if n = n' & args = args' then
raise
(Stream.Error
("Double definition of '" ^ n ^ "'" ^
(if args = [] then ""
else "(" ^ String.concat "," args ^ ")"))))
l';
check l'
in
let l = parse_all (scan ch) in check l; l
;;
let lookup name predicate_list parsed_file =
let rec search best_n best_value l =
match l with
[] -> if best_n >= 0 then best_value else raise Not_found
| (name', (predicates, value)) :: l' ->
if name = name' &
List.for_all (fun p -> List.mem p predicate_list) predicates &
List.length predicates > best_n then
search (List.length predicates) value l'
else search best_n best_value l'
in
search (-1) "" parsed_file
;;
(* ======================================================================
* History:
*
* $Log: metascanner.src,v $
* Revision 1.4 2001/10/12 15:02:57 gerd
* Reverted from '??' syntax to '?' syntax for stream parsers.
*
* Revision 1.3 2001/03/06 20:12:54 gerd
* Dropping O'Caml 2 support
*
* Revision 1.1 2000/04/26 00:09:20 gerd
* O'Caml 3 changes.
*
*
* Orginal log from metascanner.ml:
*
* Revision 1.1 1999/06/20 19:26:26 gerd
* Major change: Added support for META files. In META files, knowlege
* about compilation options, and dependencies on other packages can be stored.
* The "ocamlfind query" subcommand has been extended in order to have a
* direct interface for that. "ocamlfind ocamlc/ocamlopt/ocamlmktop/ocamlcp"
* subcommands have been added to simplify the invocation of the compiler.
*
*
*)
|
