add and test more ways to do function application in pascaligo

src/passes/1-parser/pascaligo/AST.ml

@@ -580,7 +580,7 @@ and selection =
 
 and tuple_expr = (expr, comma) nsepseq par reg
 
-and fun_call = (fun_name * arguments) reg
+and fun_call = (expr * arguments) reg
 
 and arguments = tuple_expr
 

src/passes/1-parser/pascaligo/AST.mli

@@ -570,7 +570,7 @@ and selection =
 
 and tuple_expr = (expr, comma) nsepseq par reg
 
-and fun_call = (fun_name * arguments) reg
+and fun_call = (expr * arguments) reg
 
 and arguments = tuple_expr
 

src/passes/1-parser/pascaligo/Parser.mly

@@ -863,14 +863,12 @@ core_expr:
 | Unit             { EUnit $1                     }
 | annot_expr       { EAnnot $1                    }
 | tuple_expr       { ETuple $1                    }
-| par(expr)        { EPar $1                      }
 | list_expr        { EList $1                     }
 | C_None           { EConstr (NoneExpr $1)        }
-| fun_call         { ECall $1                     }
+| fun_call_or_par_or_projection { $1              }
 | map_expr         { EMap $1                      }
 | set_expr         { ESet $1                      }
 | record_expr      { ERecord $1                   }
-| projection       { EProj $1                     }
 | Constr arguments {
     let region = cover $1.region $2.region in
     EConstr (ConstrApp {region; value = $1, Some $2})
@@ -882,6 +880,30 @@ core_expr:
     let region = cover $1 $2.region in
     EConstr (SomeApp {region; value = $1,$2})}
 
+
+fun_call_or_par_or_projection:
+| par(expr) option(arguments) {
+  let parenthesized = EPar $1 in
+  match $2 with
+  | None -> parenthesized
+  | Some args -> (
+    let region_1 = $1.region in
+    let region = cover region_1 args.region in
+    ECall {region; value = parenthesized,args}
+  )
+}
+| projection option(arguments) {
+  let project = EProj $1 in
+  match $2 with
+  | None -> project
+  | Some args -> (
+    let region_1 = $1.region in
+    let region = cover region_1 args.region in
+    ECall {region; value = project,args}
+  )
+}
+| fun_call { ECall $1 }
+
 annot_expr:
   LPAR disj_expr COLON type_expr RPAR {
     let start  = expr_to_region $2
@@ -956,7 +978,7 @@ field_assignment:
 fun_call:
   fun_name arguments {
     let region = cover $1.region $2.region
-    in {region; value = $1,$2}}
+    in {region; value = (EVar $1),$2}}
 
 tuple_expr:
   par(tuple_comp) { $1 }

src/passes/1-parser/pascaligo/ParserLog.ml

@@ -655,8 +655,8 @@ and print_nil buffer value = print_token buffer value "nil"
 and print_none_expr buffer value = print_token buffer value "None"
 
 and print_fun_call buffer {value; _} =
-  let fun_name, arguments = value in
-  print_var        buffer fun_name;
+  let expr, arguments = value in
+  print_expr       buffer expr;
   print_tuple_expr buffer arguments
 
 and print_constr_app buffer {value; _} =
@@ -1247,12 +1247,12 @@ and pp_var_binding buffer ~pad:(_,pc as pad) (source, image) =
   pp_ident buffer ~pad:(mk_pad 2 0 pc) source;
   pp_ident buffer ~pad:(mk_pad 2 1 pc) image
 
-and pp_fun_call buffer ~pad:(_,pc) (name, args) =
+and pp_fun_call buffer ~pad:(_,pc) (expr, args) =
   let args  = Utils.nsepseq_to_list args.value.inside in
   let arity = List.length args in
   let apply len rank =
     pp_expr buffer ~pad:(mk_pad len rank pc)
-  in pp_ident buffer ~pad:(mk_pad (1+arity) 0 pc) name;
+  in pp_expr buffer ~pad:(mk_pad (1+arity) 0 pc) expr;
      List.iteri (apply arity) args
 
 and pp_record_patch buffer ~pad:(_,pc as pad) patch =

src/passes/2-simplify/pascaligo.ml

@@ -263,18 +263,26 @@ let rec simpl_expression (t:Raw.expr) : expr result =
       | Some s -> return @@ e_constant ~loc s []
     )
   | ECall x -> (
-      let ((name, args) , loc) = r_split x in
-      let (f , f_loc) = r_split name in
+      let ((f, args) , loc) = r_split x in
       let (args , args_loc) = r_split args in
       let args' = npseq_to_list args.inside in
-      match List.assoc_opt f constants with
+      match f with
+      | EVar name -> (
+        let (f_name , f_loc) = r_split name in
+        match List.assoc_opt f_name constants with
         | None ->
            let%bind arg = simpl_tuple_expression ~loc:args_loc args' in
-          return @@ e_application ~loc (e_variable ~loc:f_loc f) arg
+           return @@ e_application ~loc (e_variable ~loc:f_loc f_name) arg
         | Some s ->
            let%bind lst = bind_map_list simpl_expression args' in
            return @@ e_constant ~loc s lst
       )
+      | f -> (
+        let%bind f' = simpl_expression f in
+        let%bind arg = simpl_tuple_expression ~loc:args_loc args' in
+        return @@ e_application ~loc f' arg
+      )
+    )
   | EPar x -> simpl_expression x.value.inside
   | EUnit reg ->
     let loc = Location.lift reg in
@@ -630,18 +638,26 @@ and simpl_single_instruction : Raw.instruction -> (_ -> expression result) resul
   fun t ->
   match t with
   | ProcCall x -> (
-      let ((name, args) , loc) = r_split x in
-      let (f , f_loc) = r_split name in
+    let ((f, args) , loc) = r_split x in
     let (args , args_loc) = r_split args in
     let args' = npseq_to_list args.inside in
-      match List.assoc_opt f constants with
+    match f with
+    | EVar name -> (
+      let (f_name , f_loc) = r_split name in
+      match List.assoc_opt f_name constants with
       | None ->
          let%bind arg = simpl_tuple_expression ~loc:args_loc args' in
-          return_statement @@ e_application ~loc (e_variable ~loc:f_loc f) arg
+         return_statement @@ e_application ~loc (e_variable ~loc:f_loc f_name) arg
       | Some s ->
          let%bind lst = bind_map_list simpl_expression args' in
          return_statement @@ e_constant ~loc s lst
     )
+    | f -> (
+      let%bind f' = simpl_expression f in
+      let%bind arg = simpl_tuple_expression ~loc:args_loc args' in
+      return_statement @@ e_application ~loc f' arg
+    )
+  )
   | Skip reg -> (
       let loc = Location.lift reg in
       return_statement @@ e_skip ~loc ()

src/test/contracts/application.ligo

@@ -0,0 +1,21 @@
+// Test different ways of calling functions in PascaLIGO
+
+type foo is record
+  bar : int -> int ;
+end
+
+function f (const i : int) : int is
+  begin
+    skip
+  end with i
+
+function g (const i : unit) : int -> int is
+  begin skip end with f
+
+const r : foo = record
+  bar = f ;
+end
+
+const x : int = f(42)
+const y : int = r.bar(42)
+const z : int = (g(unit))(42)

src/test/integration_tests.ml

@@ -52,6 +52,19 @@ let complex_function () : unit result =
   let make_expect = fun n -> (3 * n + 2) in
   expect_eq_n_int program "main" make_expect
 
+let application () : unit result =
+  let%bind program = type_file "./contracts/application.ligo" in
+  let%bind () =
+    let expected = e_int 42 in
+    expect_eq_evaluate program "x" expected in
+  let%bind () =
+    let expected = e_int 42 in
+    expect_eq_evaluate program "y" expected in
+  let%bind () =
+    let expected = e_int 42 in
+    expect_eq_evaluate program "z" expected in
+  ok ()
+
 let variant () : unit result =
   let%bind program = type_file "./contracts/variant.ligo" in
   let%bind () =
@@ -1164,6 +1177,7 @@ let main = test_suite "Integration (End to End)" [
     test "assign" assign ;
     test "declaration local" declaration_local ;
     test "complex function" complex_function ;
+    test "various applications" application ;
     test "closure" closure ;
     test "shared function" shared_function ;
     test "shared function (mligo)" shared_function_mligo ;