Examples with IsConstructor com.github.anba.es6draft.runtime.AbstractOperations.IsConstructor used on opensource projects

Example 1 with IsConstructor

use of com.github.anba.es6draft.runtime.AbstractOperations.IsConstructor in project es6draft by anba.

the class ArrayBufferConstructor method CloneArrayBuffer.

/**
     * 24.1.1.4 CloneArrayBuffer (srcBuffer, srcByteOffset)
     * 
     * @param cx
     *            the execution context
     * @param srcBuffer
     *            the source buffer
     * @param srcByteOffset
     *            the source offset
     * @param cloneConstructor
     *            the intrinsic constructor function
     * @return the new array buffer object
     */
public static ArrayBufferObject CloneArrayBuffer(ExecutionContext cx, ArrayBuffer srcBuffer, long srcByteOffset, Intrinsics cloneConstructor) {
    /* step 1 (implicit) */
    /* steps 2-3 */
    Constructor bufferConstructor;
    if (cloneConstructor == null) {
        /* steps 2.a-b */
        bufferConstructor = SpeciesConstructor(cx, srcBuffer, Intrinsics.ArrayBuffer);
        /* step 2.c */
        if (IsDetachedBuffer(srcBuffer)) {
            throw newTypeError(cx, Messages.Key.BufferDetached);
        }
    } else {
        /* step 3 */
        assert IsConstructor(cx.getIntrinsic(cloneConstructor));
        bufferConstructor = (Constructor) cx.getIntrinsic(cloneConstructor);
    }
    /* step 4 */
    ByteBuffer srcBlock = srcBuffer.getData();
    /* step 5 */
    long srcLength = srcBuffer.getByteLength();
    /* step 6 */
    assert srcByteOffset <= srcLength;
    /* step 7 */
    long cloneLength = srcLength - srcByteOffset;
    /* steps 8-9 */
    ArrayBufferObject targetBuffer = AllocateArrayBuffer(cx, bufferConstructor, cloneLength);
    /* step 10 */
    if (IsDetachedBuffer(srcBuffer)) {
        throw newTypeError(cx, Messages.Key.BufferDetached);
    }
    /* step 11 */
    ByteBuffer targetBlock = targetBuffer.getData();
    /* step 12 */
    CopyDataBlockBytes(targetBlock, 0, srcBlock, srcByteOffset, cloneLength);
    /* step 13 */
    return targetBuffer;
}