support for start/length in buffer methods

libs/microbit/buffer.cpp

@@ -123,21 +123,25 @@ namespace BufferMethods {
     /**
      * Shift buffer left in place, with zero padding.
      * @param offset number of bytes to shift; use negative value to shift right
+     * @param start start offset in buffer. Default is 0.
+     * @param length number of elements in buffer. If negative, length is set as the buffer length minus start. eg: -1
      */
     //%
-    void shift(Buffer buf, int offset)
+    void shift(Buffer buf, int offset, int start = 0, int length = -1)
     {
-        ManagedBuffer(buf).shift(offset);
+        ManagedBuffer(buf).shift(offset, start, length);
     }
 
     /**
      * Rotate buffer left in place.
      * @param offset number of bytes to shift; use negative value to shift right
+     * @param start start offset in buffer. Default is 0.
+     * @param length number of elements in buffer. If negative, length is set as the buffer length minus start. eg: -1
      */
     //%
-    void rotate(Buffer buf, int offset)
+    void rotate(Buffer buf, int offset, int start = 0, int length = -1)
     {
-        ManagedBuffer(buf).rotate(offset);
+        ManagedBuffer(buf).rotate(offset, start, length);
     }
 
     // int readBytes(uint8_t *dst, int offset, int length, bool swapBytes = false) const;

libs/microbit/shims.d.ts

@@ -635,16 +635,20 @@ declare interface Buffer {
     /**
      * Shift buffer left in place, with zero padding.
      * @param offset number of bytes to shift; use negative value to shift right
+     * @param start start offset in buffer. Default is 0.
+     * @param length number of elements in buffer. If negative, length is set as the buffer length minus start. eg: -1
      */
-    //% shim=BufferMethods::shift
+    //% start.defl=0 length.defl=-1 shim=BufferMethods::shift
-    shift(offset: number): void;
+    shift(offset: number, start?: number, length?: number): void;
 
     /**
      * Rotate buffer left in place.
      * @param offset number of bytes to shift; use negative value to shift right
+     * @param start start offset in buffer. Default is 0.
+     * @param length number of elements in buffer. If negative, length is set as the buffer length minus start. eg: -1
      */
-    //% shim=BufferMethods::rotate
+    //% start.defl=0 length.defl=-1 shim=BufferMethods::rotate
-    rotate(offset: number): void;
+    rotate(offset: number, start?: number, length?: number): void;
 
     /**
      * Write contents of `src` at `dstOffset` in current buffer.

pxtarget.json

@@ -70,7 +70,7 @@
         "yottaTarget": "bbc-microbit-classic-gcc",
         "yottaCorePackage": "pxt-microbit-core",
         "githubCorePackage": "microsoft/pxt-microbit-core",
-        "gittag": "v0.1.11",
+        "gittag": "v0.2.2",
         "serviceId": "ws"
     },
     "serial": {