add bytes.makertans

Author: jgirardet

tests/snippets/bytes.py

@@ -232,3 +232,12 @@
 assert b"abcd".find(b"b", 3, 4) == -1
 assert b"abcd".find(1) == -1
 assert b"abcd".find(99) == 2
+
+
+# make trans
+# fmt: off
+assert ( 
+    bytes.maketrans(memoryview(b"abc"), bytearray(b"zzz"))
+    == bytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 122, 122, 122, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255])
+)
+# fmt: on

vm/src/obj/objbyteinner.rs

@@ -590,6 +590,30 @@ impl PyByteInner {
         }
         Ok(-1isize)
     }
+
+    pub fn maketrans(from: PyObjectRef, to: PyObjectRef, vm :&VirtualMachine) -> PyResult{
+        let mut res =  vec![];
+
+        let from = match try_as_bytes_like(&from) {
+            Some(value) => value,
+            None => {return Err(vm.new_type_error(format!("a bytes-like object is required, not {}", from)));},
+        };
+
+        let to = match try_as_bytes_like(&to) {
+            Some(value) => value,
+            None => {return Err(vm.new_type_error(format!("a bytes-like object is required, not {}", to)));},
+        };
+
+        for i in 0..=255 {
+            res.push(if let Some(position) = from.iter().position(|&x| x ==i) {
+                to[position]
+            }  else {
+                i
+            });
+        }
+
+        Ok(vm.ctx.new_bytes(res))
+    }
 }
 
 pub fn try_as_byte(obj: &PyObjectRef) -> Option<Vec<u8>> {

vm/src/obj/objbytes.rs

@@ -62,6 +62,8 @@ pub fn init(context: &PyContext) {
     let bytes_type = &context.bytes_type;
     extend_class!(context, bytes_type, {
     "fromhex" => context.new_rustfunc(PyBytesRef::fromhex),
+    "maketrans" => context.new_rustfunc(PyByteInner::maketrans),
+
     });
     let bytesiterator_type = &context.bytesiterator_type;
     extend_class!(context, bytesiterator_type, {