First attempt at adding conditionals as expressions.

Warning: The simplifier is not done yet.

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

@@ -339,6 +339,16 @@ and record_patch = {
   record_inj : record_expr
 }
 
+and cond_expr = {
+  kwd_if     : kwd_if;
+  test       : expr;
+  kwd_then   : kwd_then;
+  ifso       : expr;
+  terminator : semi option;
+  kwd_else   : kwd_else;
+  ifnot      : expr
+}
+
 and conditional = {
   kwd_if     : kwd_if;
   test       : expr;
@@ -438,7 +448,8 @@ and collection =
 (* Expressions *)
 
 and expr =
-| ECase   of expr case reg
+  ECase   of expr case reg
+| ECond   of cond_expr reg
 | EAnnot  of annot_expr reg
 | ELogic  of logic_expr
 | EArith  of arith_expr
@@ -629,6 +640,7 @@ let rec expr_to_region = function
 | EBytes {region; _}
 | EUnit   region
 | ECase  {region;_}
+| ECond  {region; _}
 | EPar   {region; _} -> region
 
 and tuple_expr_to_region {region; _} = region

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

@@ -330,6 +330,16 @@ and record_patch = {
   record_inj : field_assign reg injection reg
 }
 
+and cond_expr = {
+  kwd_if     : kwd_if;
+  test       : expr;
+  kwd_then   : kwd_then;
+  ifso       : expr;
+  terminator : semi option;
+  kwd_else   : kwd_else;
+  ifnot      : expr
+}
+
 and conditional = {
   kwd_if     : kwd_if;
   test       : expr;
@@ -430,6 +440,7 @@ and collection =
 
 and expr =
   ECase   of expr case reg
+| ECond   of cond_expr reg
 | EAnnot  of annot_expr reg
 | ELogic  of logic_expr
 | EArith  of arith_expr

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

@@ -497,7 +497,7 @@ proc_call:
 conditional:
   If expr Then if_clause option(SEMI) Else if_clause {
     let region = cover $1 (if_clause_to_region $7) in
-    let value = {
+    let value : conditional = {
       kwd_if     = $1;
       test       = $2;
       kwd_then   = $3;
@@ -640,8 +640,22 @@ interactive_expr:
 
 expr:
   case(expr) { ECase ($1 expr_to_region) }
+| cond_expr  { $1                        }
 | disj_expr  { $1                        }
 
+cond_expr:
+  If expr Then expr option(SEMI) Else expr {
+    let region = cover $1 (expr_to_region $7) in
+    let value : cond_expr = {
+      kwd_if     = $1;
+      test       = $2;
+      kwd_then   = $3;
+      ifso       = $4;
+      terminator = $5;
+      kwd_else   = $6;
+      ifnot      = $7}
+    in ECond {region; value} }
+
 disj_expr:
   disj_expr Or conj_expr {
     let start  = expr_to_region $1

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

@@ -256,16 +256,23 @@ and print_instruction buffer = function
 | MapRemove   {value; _} -> print_map_remove buffer value
 | SetRemove   {value; _} -> print_set_remove buffer value
 
-and print_conditional buffer node =
-  let {kwd_if; test; kwd_then; ifso; terminator;
-       kwd_else; ifnot} = node in
-  print_token      buffer kwd_if "if";
-  print_expr       buffer test;
-  print_token      buffer kwd_then "then";
-  print_if_clause  buffer ifso;
-  print_terminator buffer terminator;
-  print_token      buffer kwd_else "else";
-  print_if_clause  buffer ifnot
+and print_cond_expr buffer (node: cond_expr) =
+  print_token      buffer node.kwd_if "if";
+  print_expr       buffer node.test;
+  print_token      buffer node.kwd_then "then";
+  print_expr       buffer node.ifso;
+  print_terminator buffer node.terminator;
+  print_token      buffer node.kwd_else "else";
+  print_expr       buffer node.ifnot
+
+and print_conditional buffer (node: conditional) =
+  print_token      buffer node.kwd_if "if";
+  print_expr       buffer node.test;
+  print_token      buffer node.kwd_then "then";
+  print_if_clause  buffer node.ifso;
+  print_terminator buffer node.terminator;
+  print_token      buffer node.kwd_else "else";
+  print_if_clause  buffer node.ifnot
 
 and print_if_clause buffer = function
   ClauseInstr instr -> print_instruction buffer instr
@@ -374,6 +381,7 @@ and print_bind_to buffer = function
 
 and print_expr buffer = function
   ECase   {value;_} -> print_case_expr buffer value
+| ECond   {value;_} -> print_cond_expr buffer value
 | EAnnot  {value;_} -> print_annot_expr buffer value
 | ELogic  e -> print_logic_expr buffer e
 | EArith  e -> print_arith_expr buffer e
@@ -919,7 +927,22 @@ and pp_instruction buffer ~pad:(_,pc as pad) = function
     pp_node buffer ~pad "SetRemove";
     pp_set_remove buffer ~pad value
 
-and pp_conditional buffer ~pad:(_,pc) cond =
+and pp_cond_expr buffer ~pad:(_,pc) (cond: cond_expr) =
+  let () =
+    let _, pc as pad = mk_pad 3 0 pc in
+    pp_node buffer ~pad "<condition>";
+    pp_expr buffer ~pad:(mk_pad 1 0 pc) cond.test in
+  let () =
+    let _, pc as pad = mk_pad 3 1 pc in
+    pp_node buffer ~pad "<true>";
+    pp_expr buffer ~pad:(mk_pad 1 0 pc) cond.ifso in
+  let () =
+    let _, pc as pad = mk_pad 3 2 pc in
+    pp_node buffer ~pad "<false>";
+    pp_expr buffer ~pad:(mk_pad 1 0 pc) cond.ifnot
+  in ()
+
+and pp_conditional buffer ~pad:(_,pc) (cond: conditional) =
   let () =
     let _, pc as pad = mk_pad 3 0 pc in
     pp_node buffer ~pad "<condition>";
@@ -1254,6 +1277,9 @@ and pp_expr buffer ~pad:(_,pc as pad) = function
   ECase {value; _} ->
     pp_node buffer ~pad "ECase";
     pp_case pp_expr buffer ~pad value
+| ECond {value; _} ->
+    pp_node buffer ~pad "ECond";
+    pp_cond_expr buffer ~pad value
 | EAnnot {value; _} ->
     pp_node buffer ~pad "EAnnot";
     pp_annotated buffer ~pad value

src/passes/2-simplify/pascaligo.ml

@@ -379,6 +379,28 @@ let rec simpl_expression (t:Raw.expr) : expr result =
   | ELogic l -> simpl_logic_expression l
   | EList l -> simpl_list_expression l
   | ESet s -> simpl_set_expression s
+  | ECond _ -> ( failwith "TODO"
+(*
+      let (c , loc) = r_split c in
+      let%bind expr = simpl_expression c.test in
+
+      let%bind match_true = simpl_expression c.ifso in
+      let%bind match_false = simpl_expression c.ifnot in
+
+      let%bind match_true = match_true None in
+      let%bind match_false = match_false None in
+      return @@ e_matching expr ~loc (Match_bool {match_true; match_false})
+*)
+
+(*
+      let%bind lst =
+        bind_list @@
+        [ok (Raw.PTrue Region.ghost, simpl_expression c.ifso);
+         ok (Raw.PFalse Region.ghost, simpl_expression c.ifnot)] in
+      let%bind cases = simpl_cases lst in
+      return @@ e_matching ~loc e cases
+*)
+    )
   | ECase c -> (
       let (c , loc) = r_split c in
       let%bind e = simpl_expression c.expr in