language server over stdio, emacs mode with repl and eglot wiring

1 files changed, 13 insertions, 2 deletions

diff --git a/lib/front.mli b/lib/front.mli
index 00fa65f..a4e91e6 100644
--- a/lib/front.mli
+++ b/lib/front.mli
@@ -1,7 +1,18 @@
 (** Front door: text to statements.
 
     Wraps the generated lexer and parser so callers see one total
-    function from source text to syntax or a positioned message.
-    The REPL, the file runner, and the tests all enter here. *)
+    function from source text to syntax or a positioned error. The
+    REPL, the file runner, the LSP server, and the tests all enter
+    here. *)
+
+type error = {
+  line : int;  (** 1-based, as editors count *)
+  column : int;  (** 0-based character offset in the line *)
+  message : string;
+}
+
+val parse : string -> (Ast.statement list, error) result
 
 val parse_string : string -> (Ast.statement list, string) result
+(** [parse] with the position folded into the message, for callers
+    that only print. *)