add bitwise AND (&) operator (#7415)

Author: cometkim

CHANGELOG.md

@@ -19,6 +19,7 @@
 #### :rocket: New Feature
 
 - Add shift (`<<`, `>>`, `>>>`) operators for `int` and `bigint`. https://github.com/rescript-lang/rescript/pull/7183
+- Add bitwise AND (`&`) operator for `int` and `bigint`. https://github.com/rescript-lang/rescript/pull/7415
 - Significantly reduced the download size by splitting binaries into optional platform-specific dependencies (e.g, `@rescript/linux-x64`). https://github.com/rescript-lang/rescript/pull/7395
 
 #### :bug: Bug fix

compiler/ml/unified_ops.ml

@@ -207,6 +207,19 @@ let entries =
           string = None;
         };
     };
+    {
+      path = builtin "&";
+      name = "%bitand";
+      form = Binary;
+      specialization =
+        {
+          int = Pandint;
+          bool = None;
+          float = None;
+          bigint = Some Pandbigint;
+          string = None;
+        };
+    };
     {
       path = builtin "^";
       name = "%bitxor";

compiler/syntax/src/res_parsetree_viewer.ml

@@ -273,12 +273,13 @@ let operator_precedence operator =
   | "||" -> 2
   | "&&" -> 3
   | "^" -> 4
-  | "==" | "===" | "<" | ">" | "!=" | "<>" | "!==" | "<=" | ">=" | "|>" -> 5
-  | "<<" | ">>" | ">>>" -> 6
-  | "+" | "+." | "-" | "-." | "++" -> 7
-  | "*" | "*." | "/" | "/." | "%" -> 8
-  | "**" -> 9
-  | "#" | "##" | "->" -> 10
+  | "&" -> 5
+  | "==" | "===" | "<" | ">" | "!=" | "<>" | "!==" | "<=" | ">=" | "|>" -> 6
+  | "<<" | ">>" | ">>>" -> 7
+  | "+" | "+." | "-" | "-." | "++" -> 8
+  | "*" | "*." | "/" | "/." | "%" -> 9
+  | "**" -> 10
+  | "#" | "##" | "->" -> 11
   | _ -> 0
 
 let is_unary_operator operator =
@@ -301,7 +302,7 @@ let is_binary_operator operator =
   match operator with
   | ":=" | "||" | "&&" | "==" | "===" | "<" | ">" | "!=" | "!==" | "<=" | ">="
   | "|>" | "+" | "+." | "-" | "-." | "++" | "*" | "*." | "/" | "/." | "**"
-  | "->" | "<>" | "%" | "^" | "<<" | ">>" | ">>>" ->
+  | "->" | "<>" | "%" | "&" | "^" | "<<" | ">>" | ">>>" ->
     true
   | _ -> false
 

compiler/syntax/src/res_token.ml

@@ -107,15 +107,16 @@ let precedence = function
   | Lor -> 2
   | Land -> 3
   | Caret -> 4
+  | Band -> 5
   | Equal | EqualEqual | EqualEqualEqual | LessThan | GreaterThan | BangEqual
   | BangEqualEqual | LessEqual | GreaterEqual | BarGreater ->
-    5
-  | LeftShift | RightShift | RightShiftUnsigned -> 6
-  | Plus | PlusDot | Minus | MinusDot | PlusPlus -> 7
-  | Asterisk | AsteriskDot | Forwardslash | ForwardslashDot | Percent -> 8
-  | Exponentiation -> 9
-  | MinusGreater -> 10
-  | Dot -> 11
+    6
+  | LeftShift | RightShift | RightShiftUnsigned -> 7
+  | Plus | PlusDot | Minus | MinusDot | PlusPlus -> 8
+  | Asterisk | AsteriskDot | Forwardslash | ForwardslashDot | Percent -> 9
+  | Exponentiation -> 10
+  | MinusGreater -> 11
+  | Dot -> 12
   | _ -> 0
 
 let to_string = function

runtime/Pervasives.res

@@ -68,6 +68,7 @@ external \"%": ('a, 'a) => 'a = "%mod"
 external \"<<": ('a, 'a) => 'a = "%lsl"
 external mod: ('a, 'a) => 'a = "%mod"
 external \"**": ('a, 'a) => 'a = "%pow"
+external \"&": ('a, 'a) => 'a = "%bitand"
 external \"^": ('a, 'a) => 'a = "%bitxor"
 external \">>": ('a, 'a) => 'a = "%asr"
 external \">>>": ('a, 'a) => 'a = "%lsr"

tests/syntax_tests/data/parsing/grammar/expressions/binary.res

@@ -29,6 +29,7 @@ let x = a + -1 + -2
 let x = a + @attr -1 + @attr -2
 let x = a % a == 0
 let x = a ^ a == 0
+let x = a & a == 0
 let x = a << a == 0
 let x = a >> a == 0
 let x = a >>> a == 0

tests/syntax_tests/data/parsing/grammar/expressions/expected/binary.res.txt

@@ -15,6 +15,7 @@ let x = (a + (-1)) + (-2)
 let x = (a + (((-1))[@attr ])) + (((-2))[@attr ])
 let x = (a % a) == 0
 let x = a ^ (a == 0)
+let x = a & (a == 0)
 let x = (a << a) == 0
 let x = (a >> a) == 0
 let x = (a >>> a) == 0

tests/syntax_tests/data/printer/expr/binary.res

@@ -50,11 +50,11 @@ let () = x.left = value |> logMutation
 let () = x.left = (value |> process) |> x.right = value |> process
 let () = (x: int) |> (print_int: int => unit)
 
-// math
 x + y / z
 x / y + z
 x % y * z
 x ^ y + z
+x & y + z
 x << y + z
 x >> y + z
 x >>> y + z

tests/syntax_tests/data/printer/expr/expected/binary.res.txt

@@ -81,11 +81,11 @@ let () = x.left = logMutation(value)
 let () = x.left = (x.right = process(value))(process(value))
 let () = (print_int: int => unit)((x: int))
 
-// math
 x + y / z
 x / y + z
 x % y * z
 x ^ y + z
+x & y + z
 x << y + z
 x >> y + z
 x >>> y + z

tests/tests/src/unified_ops_test.mjs

@@ -75,6 +75,14 @@ function bxor_bigint(a, b) {
   return a ^ b;
 }
 
+function band_int(a, b) {
+  return a & b;
+}
+
+function band_bigint(a, b) {
+  return a & b;
+}
+
 let bigintShiftLeft = (1n << 2n);
 
 let bigintShiftRight = (8n >> 2n);
@@ -111,6 +119,8 @@ export {
   pow_overflow,
   bxor_int,
   bxor_bigint,
+  band_int,
+  band_bigint,
   intShiftLeft,
   intShiftRight,
   intShiftRightUnsigned,