add doc and test

gitlab-pages/docs/language-basics/functions.md

@@ -299,3 +299,43 @@ gitlab-pages/docs/language-basics/src/functions/incr_map.religo incr_map
 
 </Syntax>
 
+## Recursive function
+
+LIGO function are not recursive by default, the user need to indicate that the function is recursive.
+
+At the moment, recursive function are limited to one (possibly tupled) parameter and recursion is
+limited to tail recursion (i.e the recursive call should be the last expression of the function)
+
+<Syntax syntax="pascaligo">
+In PascaLigo recursive funciton are defined using the "recursive" keyword
+
+```pascaligo group=d
+recursive function sum (const n : int; const acc: int) : int is
+  if n<1 then acc else sum(n-1,acc+n)
+
+recursive function fibo (const n: int; const n_1: int; const n_0 :int) : int is
+  if n<2 then n_1 else fibo(n-1,n_1+n_0,n_1)
+```
+</Syntax>
+<Syntax syntax="cameligo">
+In CameLigo recursive funciton are defined using the "rec" keyword
+
+```cameligo group=d
+let rec sum ((n,acc):int * int) : int =
+    if (n < 1) then acc else sum (n-1, acc+n)
+ 
+let rec fibo ((n,n_1,n_0):int*int*int) : int = 
+    if (n < 2) then n_1 else fibo (n-1, n_1 + n_0, n_1)
+```
+</Syntax>
+<Syntax syntax="reasonligo">
+In ReasonLigo recursive funciton are defined using the "rec" keyword
+
+```reasonligo group=d
+let rec sum = ((n, acc) : (int,int)): int =>
+    if (n < 1) {acc;} else {sum ((n-1,acc+n));};
+
+let rec fibo = ((n, n_1, n_0) : (int,int,int)): int =>
+    if (n < 2) {n_1;} else {fibo ((n-1,n_1+n_0,n_1));};
+```
+</Syntax>

src/test/contracts/recursion.ligo

@@ -1,4 +1,7 @@
 // Test while loops in PascaLIGO
 
-recursive function fibo (const n : int; const acc: int) : int is
-  if n<1 then acc else fibo(n-1,acc+n)
+recursive function sum (const n : int; const acc: int) : int is
+  if n<1 then acc else sum(n-1,acc+n)
+
+recursive function fibo (const n: int; const n_1: int; const n_0 :int) : int is
+  if n<2 then n_1 else fibo(n-1,n_1+n_0,n_1)

src/test/contracts/recursion.mligo

@@ -1,5 +1,7 @@
 // Test while loops in PascaLIGO
 
-let rec fibo ((n,acc):int * int) : int =
-    if (n < 1) then acc
-    else fibo (n-1, acc+n)
+let rec sum ((n,acc):int * int) : int =
+    if (n < 1) then acc else sum (n-1, acc+n)
+ 
+let rec fibo ((n,n_1,n_0):int*int*int) : int = 
+    if (n < 2) then n_1 else fibo (n-1, n_1 + n_0, n_1)

src/test/contracts/recursion.religo

@@ -1,5 +1,7 @@
 // Test while loops in PascaLIGO
 
-let rec fibo = ((n, acc) : (int,int)): int =>
-    if (n < 1) {acc;}
-    else {fibo ((n-1,acc+n));};
+let rec sum = ((n, acc) : (int,int)): int =>
+    if (n < 1) {acc;} else {sum ((n-1,acc+n));};
+
+let rec fibo = ((n, n_1, n_0) : (int,int,int)): int =>
+    if (n < 2) {n_1;} else {fibo ((n-1,n_1+n_0,n_1));};

src/test/integration_tests.ml

@@ -1495,24 +1495,43 @@ let assert_religo () : unit result =
 
 let recursion_ligo () : unit result =
   let%bind program = type_file "./contracts/recursion.ligo" in
-  let make_input = e_pair (e_int 10) (e_int 0) in
-  let make_expected = e_int 55 in
-  let%bind _ = expect_eq program "fibo" make_input make_expected in
-  ok ()
+  let%bind _ =
+    let make_input = e_pair (e_int 10) (e_int 0) in
+    let make_expected = e_int 55 in
+    expect_eq program "sum" make_input make_expected 
+  in
+  let%bind _ =
+    let make_input = e_tuple [(e_int 10); (e_int 1); (e_int 1)] in
+    let make_expected = e_int 89 in
+    expect_eq program "fibo" make_input make_expected
+  in ok ()
+  
 
 let recursion_mligo () : unit result =
   let%bind program = mtype_file "./contracts/recursion.mligo" in
-  let make_input = e_pair (e_int 10) (e_int 0) in
-  let make_expected = e_int 55 in
-  let%bind _ = expect_eq program "fibo" make_input make_expected in
-  ok ()
+  let%bind _ =
+    let make_input = e_pair (e_int 10) (e_int 0) in
+    let make_expected = e_int 55 in
+    expect_eq program "sum" make_input make_expected 
+  in
+  let%bind _ =
+    let make_input = e_tuple [(e_int 10); (e_int 1); (e_int 1)] in
+    let make_expected = e_int 89 in
+    expect_eq program "fibo" make_input make_expected
+  in ok ()
 
 let recursion_religo () : unit result =
   let%bind program = retype_file "./contracts/recursion.religo" in
-  let make_input = e_pair (e_int 10) (e_int 0) in
-  let make_expected = e_int 55 in
-  let%bind _ = expect_eq program "fibo" make_input make_expected in
-  ok ()
+  let%bind _ =
+    let make_input = e_pair (e_int 10) (e_int 0) in
+    let make_expected = e_int 55 in
+    expect_eq program "sum" make_input make_expected 
+  in
+  let%bind _ =
+    let make_input = e_tuple [(e_int 10); (e_int 1); (e_int 1)] in
+    let make_expected = e_int 89 in
+    expect_eq program "fibo" make_input make_expected
+  in ok ()
 
 let guess_string_mligo () : unit result =
   let%bind program = type_file "./contracts/guess_string.mligo" in