final polishing for coqide bindings

1 files changed, 131 insertions, 0 deletions

diff --git a/ide/unicode_bindings.ml b/ide/unicode_bindings.ml
new file mode 100644
index 0000000000..e2f98302ea
--- /dev/null
+++ b/ide/unicode_bindings.ml
@@ -0,0 +1,131 @@
+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+
+let all_bindings = ref []
+  (* example unicode bindings table:
+  [ ("\\pi", "π", None);
+    ("\\lambdas", "λs", Some 4);
+    ("\\lambda", "λ", Some 3);
+    ("\\lake", "0", Some 2);
+    ("\\lemma", "Lemma foo : x. Proof. Qed", Some 1); ] *)
+
+(** Auxiliary function used by [load_files].
+    Takes as argument a valid path. *)
+
+let process_file filename =
+  if not (Sys.file_exists filename) then begin
+    Ideutils.warning (Printf.sprintf "Warning: unicode bindings file '%s' was not found." filename)
+  end else begin
+    let ch = open_in filename in
+    begin try while true do
+      let line = input_line ch in
+      begin try
+        let chline = Scanf.Scanning.from_string line in
+        let (key,value) =
+          Scanf.bscanf chline "%s %s" (fun x y -> (x,y)) in
+        let prio =
+          try Scanf.bscanf chline " %d" (fun x -> Some x)
+          with Scanf.Scan_failure _ | Failure _ | End_of_file -> None
+          in
+        all_bindings := (key,value,prio)::!all_bindings;
+        (* Note: storing bindings in reverse order, flipping is done later *)
+        Scanf.Scanning.close_in chline;
+      with End_of_file -> () end;
+    done with End_of_file -> () end;
+    close_in ch
+  end
+
+let load_files filenames =
+  let selected_filenames = ref [] in
+  let add f =
+    selected_filenames := f::!selected_filenames in
+  let warn_default_not_found () =
+    Ideutils.warning (Printf.sprintf
+      "Warning: the file 'ide/default.bindings' was not found in %s."
+      (Envars.coqlib())) in
+  let warn_local_not_found () =
+    Ideutils.warning (Printf.sprintf
+      "Warning: the local configuration file 'coqide.bindings' was not found.") in
+  if filenames = [] then begin
+    (* If no argument is provided using [-unicode-bindings],
+       then use the default file and the local file, if it exists *)
+    begin match Preferences.get_unicode_bindings_default_file() with
+    | Some f -> add f
+    | None -> warn_default_not_found()
+    end;
+    begin match Preferences.get_unicode_bindings_local_file() with
+    | Some f -> add f
+    | None -> ()
+    end;
+  end else begin
+    (* If [-unicode-bindings] is used with a list of file, consider
+       these files in order, with a special treatment for the tokens
+       "default" and "local", which are replaced by the appropriate path. *)
+    let add_arg f =
+      match f with
+      | "default" ->
+        begin match Preferences.get_unicode_bindings_default_file() with
+        | Some f -> add f
+        | None -> warn_default_not_found()
+        end
+      | "local" ->
+        begin match Preferences.get_unicode_bindings_local_file() with
+        | Some f -> add f
+        | None -> warn_local_not_found()
+        end
+      | _ -> add f
+      in
+    List.iter add_arg filenames
+  end;
+  (* Files must be processed in order, to build the list of bindings
+     by iteratively consing entry to its head, the list being reversed
+     at the very end *)
+  let real_filenames = List.rev !selected_filenames in
+  List.iter process_file real_filenames;
+  all_bindings := List.rev !all_bindings
+  (* For debugging the list of unicode files loaded:
+     List.iter (fun f -> Printf.eprintf "%s\n" f) real_filenames; *)
+
+(** Auxiliary function to test whether [s] is a prefix of [str];
+    Note that there might be overlap with wg_Completion::is_substring *)
+
+let string_is_prefix s str =
+  let n = String.length s in
+  let m = String.length str in
+  if m < n
+    then false
+    else (s = String.sub str 0 n)
+
+let lookup prefix =
+  let max_priority = 100000000 in
+  let cur_word = ref None in
+  let cur_prio = ref (max_priority+1) in
+  let test_binding (key, word, prio_opt) =
+    let prio =
+      match prio_opt with
+      | None -> max_priority
+      | Some p -> p
+      in
+    if string_is_prefix prefix key && prio < !cur_prio then begin
+      cur_word := Some word;
+      cur_prio := prio;
+    end in
+  List.iter test_binding !all_bindings;
+  !cur_word
+
+
+(* For debugging the list of unicode bindings loaded:
+  let print_unicode_bindings () =
+    List.iter (fun (x,y,p) ->
+      Printf.eprintf "%s %s %d\n" x y (match p with None -> -1 | Some n -> n))
+     !all_bindings;
+    prerr_newline()
+*)