3 files changed, 112 insertions, 1 deletions
diff --git a/lib/syntax/dead_end.ml b/lib/syntax/dead_end.ml
new file mode 100644
index 0000000..78eadda
--- /dev/null
+++ b/lib/syntax/dead_end.ml
@@ -0,0 +1,49 @@
+open StdLabels
+
+type pos = Lexing.position * Lexing.position
+type ('a, 'b) variable = { pos : 'a; name : string; index : 'b option }
+
+module Expression = Default.Expression
+
+module Instruction = struct
+  type repr = unit
+  type expression = Expression.repr
+  type variable = Expression.variable
+
+  (** Call for an instruction like [GT] or [*CLR] *)
+  let call : pos -> string -> expression list -> repr = fun _ _ _ -> ()
+
+  (** Label for a loop *)
+  let location : pos -> string -> repr = fun _ _ -> ()
+
+  (** Comment *)
+  let comment : pos -> repr = fun _ -> ()
+
+  (** Raw expression *)
+  let expression : expression -> repr = fun _ -> ()
+
+  type clause = pos * expression * repr list
+
+  let if_ : pos -> clause -> elifs:clause list -> else_:repr list -> repr =
+   fun _ _ ~elifs ~else_ ->
+    ignore elifs;
+    ignore else_;
+    ()
+
+  let act : pos -> label:expression -> repr list -> repr =
+   fun _ ~label _ ->
+    ignore label;
+    ()
+
+  let assign : pos -> variable -> T.assignation_operator -> expression -> repr =
+   fun _ _ _ _ -> ()
+end
+
+module Location = struct
+  type repr = Instruction.repr
+  type instruction = Instruction.repr
+
+  let location : pos -> instruction list -> repr =
+   fun _pos instructions ->
+    List.fold_left instructions ~init:() ~f:(fun () instruction -> instruction)
+end
diff --git a/lib/syntax/default.ml b/lib/syntax/default.ml
index f4bc34e..9c5073c 100644
--- a/lib/syntax/default.ml
+++ b/lib/syntax/default.ml
@@ -1,3 +1,8 @@
+(** Default implementation which does nothing. 
+
+This module is expected to be used when you only need to implement an analyze
+over a limited part of the whole syntax. *)
+
 type pos = Lexing.position * Lexing.position
 type ('a, 'b) variable = { pos : 'a; name : string; index : 'b option }
 
@@ -5,7 +10,7 @@ module Expression = struct
   type 'a obs
   type repr = unit
 
-  type variable = { pos : pos; name : string; index : repr option }
+  type variable
   (** 
       Describe a variable, using the name in capitalized text, and an optionnal
       index.
diff --git a/lib/syntax/t.ml b/lib/syntax/t.ml
index 9c25647..e9a901d 100644
--- a/lib/syntax/t.ml
+++ b/lib/syntax/t.ml
@@ -76,3 +76,60 @@ type function_ =
   | Ucase'
   | Val
 [@@deriving eq, show]
+
+type keywords =
+  | Inclib
+  | Addobj
+  | Cla
+  | Clear
+  | Clear'
+  | Close
+  | CloseAll
+  | Cls
+  | CmdClear
+  | CopyArr
+  | CurActs
+  | CurActs'
+  | CurLoc
+  | CurLoc'
+  | DelAct
+  | FreeLib
+  | DelObj
+  | Dynamic
+  | Exec
+  | Exit
+  | Gosub
+  | Goto
+  | IncLib
+  | Jump
+  | KillAll
+  | KillObj
+  | KillVar
+  | MainTxt
+  | MainTxt'
+  | Menu
+  | Msg
+  | Nl
+  | Nl'
+  | P
+  | P'
+  | Play
+  | Play'
+  | RefInt
+  | SaveGame
+  | SelAct'
+  | SelObj
+  | SelObj'
+  | SetTimer
+  | ShowActs
+  | ShowInput
+  | ShowObjs
+  | ShowStat
+  | Unselect
+  | UseHTML
+  | UserCom'
+  | UserText
+  | UserText'
+  | View
+  | Wait
+  | XGoto