add simple form of bytes.replace

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/bytes/BytesBuiltins.java

@@ -44,6 +44,7 @@
 import static com.oracle.graal.python.nodes.SpecialMethodNames.__SETITEM__;
 import static com.oracle.graal.python.runtime.exception.PythonErrorType.TypeError;
 
+import java.io.UnsupportedEncodingException;
 import java.nio.charset.CodingErrorAction;
 import java.util.List;
 
@@ -540,6 +541,27 @@ public PDict maketrans(PBytes from, PBytes to,
             }
 
             return translation;
+    @Builtin(name = "replace", fixedNumOfPositionalArgs = 3)
+    @GenerateNodeFactory
+    abstract static class ReplaceNode extends PythonTernaryBuiltinNode {
+        @Child BytesNodes.ToBytesNode toBytes = BytesNodes.ToBytesNode.create();
+
+        @Specialization
+        @TruffleBoundary
+        PBytes replace(PBytes self, PBytes substr, PBytes replacement) {
+            byte[] bytes = toBytes.execute(self);
+            byte[] subBytes = toBytes.execute(substr);
+            byte[] replacementBytes = toBytes.execute(replacement);
+            try {
+                String string = new String(bytes, "ASCII");
+                String subString = new String(subBytes, "ASCII");
+                String replacementString = new String(replacementBytes, "ASCII");
+                byte[] newBytes = string.replace(subString, replacementString).getBytes("ASCII");
+                return factory().createBytes(newBytes);
+            } catch (UnsupportedEncodingException e) {
+                CompilerDirectives.transferToInterpreter();
+                throw new IllegalStateException();
+            }
         }
     }
 }