open Printf
+let debug = false
+let debug_print s =
+ if debug then prerr_endline ("Helm_registry debugging: " ^ s)
+
exception Malformed_key of string
exception Key_not_found of string
+exception Cyclic_definition of string
exception Type_error of string * string * string (* expected type, value, msg *)
-exception Parse_error of string * int (* file, lineno *)
+exception Parse_error of string * int * int * string (* file, line, col, msg *)
exception Invalid_value of (string * string) * string (* key, value, descr *)
-exception Unescape_failure
-
type validator_id = int
+ (* root XML tag: used by save_to, ignored by load_from *)
+let root_tag = "helm_registry"
+
let get_next_validator_id =
let next_id = ref 0 in
fun () ->
Hashtbl.clear registry;
Hashtbl.iter (fun key value -> Hashtbl.replace registry key value) backup
-let valid_key_rex_raw = "\\w+(\\.\\w+)*"
-let config_line_raw = sprintf "\\s*(%s)\\s*=\\s*\"(.*)\"\\s*" valid_key_rex_raw
-let comment_rex = Pcre.regexp "^\\s*(#|$)"
-let valid_key_rex = Pcre.regexp ("^" ^ valid_key_rex_raw ^ "$")
-let config_line_rex = Pcre.regexp ("^" ^ config_line_raw ^ "$")
+ (* as \\w but:
+ * - no sequences of '_' longer than 1 are permitted
+ * - no uppercase letter are permitted
+ *)
+let valid_step_rex_raw = "[a-z0-9]+\\(_[a-z0-9]+\\)*"
+let valid_key_rex_raw =
+ sprintf "%s\(\\.%s\)*" valid_step_rex_raw valid_step_rex_raw
+let valid_key_rex = Str.regexp ("^" ^ valid_key_rex_raw ^ "$")
+let interpolated_key_rex = Str.regexp ("\\$(" ^ valid_key_rex_raw ^ ")")
+let dot_rex = Str.regexp "\\."
+let spaces_rex = Str.regexp "[ \t\n\r]+"
+let heading_spaces_rex = Str.regexp "^[ \t\n\r]+"
-let is_comment s = Pcre.pmatch ~rex:comment_rex s
+let split s =
+ (* trailing blanks are removed per default by split *)
+ Str.split spaces_rex (Str.global_replace heading_spaces_rex "" s)
+let merge l = String.concat " " l
-let escape = String.escaped
-let unescape =
- let lexer = lazy (Genlex.make_lexer []) in
- fun s ->
- let tok_stream = Lazy.force lexer (Stream.of_string ("\"" ^ s ^ "\"")) in
- match Stream.peek tok_stream with
- | Some (Genlex.String s) -> s
- | _ -> raise Unescape_failure
+ (* escapes for xml configuration file *)
+let (escape, unescape) =
+ let (in_enc, out_enc) = (`Enc_utf8, `Enc_utf8) in
+ (Netencoding.Html.encode ~in_enc ~out_enc (),
+ Netencoding.Html.decode ~in_enc ~out_enc ~entity_base:`Xml ())
let key_is_valid key =
- if not (Pcre.pmatch ~rex:valid_key_rex key) then
+(* if not (Pcre.pmatch ~rex:valid_key_rex key) then *)
+ if not (Str.string_match valid_key_rex key 0) then
raise (Malformed_key key)
let value_is_valid ~key ~value =
(Hashtbl.find_all validators key)
let set' registry ~key ~value =
+ debug_print (sprintf "Setting %s = %s" key value);
key_is_valid key;
value_is_valid ~key ~value;
Hashtbl.replace registry key value
+let unset = Hashtbl.remove registry
+
+let env_var_of_key key =
+(* Pcre.replace ~rex:dot_rex ~templ:"__" (String.uppercase key) *)
+ Str.global_replace dot_rex "__" (String.uppercase key)
+
let get key =
- key_is_valid key;
- try
- Hashtbl.find registry key
- with Not_found -> raise (Key_not_found key)
+ let rec aux stack key =
+ key_is_valid key;
+ if List.mem key stack then begin
+ let msg = (String.concat " -> " (List.rev stack)) ^ " -> " ^ key in
+ raise (Cyclic_definition msg)
+ end;
+ let registry_value = (* internal value *)
+ try
+ Some (Hashtbl.find registry key)
+ with Not_found -> None
+ in
+ let env_value = (* environment value *)
+ try
+ Some (Sys.getenv (env_var_of_key key))
+ with Not_found -> None
+ in
+ let value = (* resulting value *)
+ match (registry_value, env_value) with
+ | Some reg, Some env -> env
+ | Some reg, None -> reg
+ | None, Some env -> env
+ | None, None -> raise (Key_not_found key)
+ in
+ interpolate (key :: stack) value
+ and interpolate stack value =
+ Str.global_substitute interpolated_key_rex
+ (fun s ->
+ let matched = Str.matched_string s in
+ (* "$(var)" -> "var" *)
+ let key = String.sub matched 2 (String.length matched - 3) in
+ aux stack key)
+ value
+ in
+ aux [] key
let set = set' registry
-let string_list_of_string s =
- (* trailing blanks are removed per default by Pcre.split *)
- Pcre.split ~pat:"\\s+" (Pcre.replace ~pat:"^\\s+" s)
-let string_of_string_list l = String.concat " " l
-
let mk_get_set type_name (from_string: string -> 'a) (to_string: 'a -> string) =
let getter key =
let value = get key in
let setter ~key ~value = set ~key ~value:(to_string value) in
(getter, setter)
+let (get_string, set_string) = (get, set)
let (get_int, set_int) = mk_get_set "int" int_of_string string_of_int
let (get_float, set_float) = mk_get_set "float" float_of_string string_of_float
-let (get_string_list, set_string_list) =
- mk_get_set "string list" string_list_of_string string_of_string_list
+let (get_bool, set_bool) = mk_get_set "bool" bool_of_string string_of_bool
+let (get_string_list, set_string_list) = mk_get_set "string list" split merge
+
+let get_opt getter key =
+ try
+ Some (getter key)
+ with Key_not_found _ -> None
+let set_opt setter ~key ~value =
+ match value with
+ | None -> unset key
+ | Some value -> setter ~key ~value
+
+(*
+let save_to =
+ let dtd = new dtd default_config.warner `Enc_utf8 in
+ let rec create_key node sections key value =
+ match sections with
+ | [] -> create_element_node ~valcheck:false default_spec dtd
+*)
let save_to fname =
+ debug_print ("Saving configuration to " ^ fname);
let oc = open_out fname in
+ output_string oc "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
+ output_string oc "<helm_registry>\n";
try
Hashtbl.iter
(fun key value ->
- output_string oc (sprintf "%s = \"%s\"" key (escape value)))
+ fprintf oc " <value key=\"%s\">%s</value>\n" key (escape value))
registry;
+ output_string oc "</helm_registry>";
close_out oc
with e ->
close_out oc;
raise e
-let load_from fname =
- let backup = backup_registry () in
- Hashtbl.clear registry;
- let ic = open_in fname in
- let lineno = ref 0 in
- try
- while true do
- incr lineno;
- let line = input_line ic in
- if not (is_comment line) then
- let subs = Pcre.extract ~rex:config_line_rex line in
- let (key, value) = (subs.(1), unescape subs.(3)) in
- set ~key ~value
- done
- with
- | End_of_file -> close_in ic
- | Malformed_key _ | Unescape_failure | Not_found ->
- restore_registry backup;
- raise (Parse_error (fname, !lineno))
- | e ->
- close_in ic;
- restore_registry backup;
- raise e
-
let add_validator ~key ~validator ~descr =
let id = get_next_validator_id () in
Hashtbl.add validators key (validator, descr);
id
-(*
- (* DEBUGGING *)
+open Pxp_document
+open Pxp_types
+open Pxp_yacc
+
+let load_from_absolute =
+ let config = default_config in
+ let entry = `Entry_document [ `Extend_dtd_fully; `Parse_xml_decl ] in
+ let fold_key key_stack key =
+ match key_stack with
+ | [] -> key
+ | _ -> String.concat "." key_stack ^ "." ^ key
+ in
+ fun fname ->
+ debug_print ("Loading configuration from " ^ fname);
+ let document =
+ parse_wfdocument_entity config (from_file fname) default_spec
+ in
+ let rec aux key_stack node =
+ node#iter_nodes (fun n ->
+ try
+ (match n#node_type with
+ | T_element "section" ->
+ let section = n#required_string_attribute "name" in
+ aux (key_stack @ [section]) n
+ | T_element "key" ->
+ let key = n#required_string_attribute "name" in
+ let value = n#data in
+ set ~key:(fold_key key_stack key) ~value
+ | _ -> ())
+ with exn ->
+ let (fname, line, pos) = n#position in
+ raise (Parse_error (fname, line, pos,
+ "Uncaught exception: " ^ Printexc.to_string exn)))
+ in
+ let backup = backup_registry () in
+ Hashtbl.clear registry;
+ try
+ aux [] document#root
+ with exn ->
+ restore_registry backup;
+ raise exn
+
+let load_from ?path fname =
+ if Filename.is_relative fname then begin
+ let no_file_found = ref true in
+ let path =
+ match path with
+ | Some path -> path (* path given as argument *)
+ | None -> [ Sys.getcwd () ] (* no path given, try with cwd *)
+ in
+ List.iter
+ (fun dir ->
+ let conffile = dir ^ "/" ^ fname in
+ if Sys.file_exists conffile then begin
+ no_file_found := false;
+ load_from_absolute conffile
+ end)
+ path;
+ if !no_file_found then
+ failwith (sprintf
+ "Helm_registry.init: no configuration file named %s in [ %s ]"
+ fname (String.concat "; " path))
+ end else
+ load_from_absolute fname
+
+ (* DEBUGGING ONLY *)
+
let dump () = Hashtbl.iter (fun k v -> printf "%s = %s\n" k v) registry
-*)
projects / helm.git / blobdiff