Struct YDeltaIn 

#[repr(C)]
pub struct YDeltaIn {
    pub tag: u8,
    pub len: u32,
    pub attributes: *const YInput,
    pub insert: *const YInput,
}

A data type representing a single change to be performed in sequence of changes defined as parameter to a ytext_insert_delta function. A type of change can be detected using a tag field:

1. Y_EVENT_CHANGE_ADD marks a new characters added to a collection. In this case insert field contains a pointer to a list of newly inserted values, while len field informs about their count. Additionally attributes_len and attributes carry information about optional formatting attributes applied to edited blocks.
2. Y_EVENT_CHANGE_DELETE marks an existing elements removed from the collection. In this case len field informs about number of removed elements.
3. Y_EVENT_CHANGE_RETAIN marks a number of characters that have not been changed, counted from the previous element. len field informs about number of retained elements. Additionally attributes_len and attributes carry information about optional formatting attributes applied to edited blocks.

Fields

tag: u8

Tag field used to identify particular type of change made:

1. Y_EVENT_CHANGE_ADD marks a new elements added to a collection. In this case values field contains a pointer to a list of newly inserted values, while len field informs about their count.
2. Y_EVENT_CHANGE_DELETE marks an existing elements removed from the collection. In this case len field informs about number of removed elements.
3. Y_EVENT_CHANGE_RETAIN marks a number of elements that have not been changed, counted from the previous element. len field informs about number of retained elements.

len: u32

Number of element affected by current type of change. It can refer to a number of inserted values, number of deleted element or a number of retained (unchanged) values.

attributes: *const YInput

A nullable pointer to a list of formatting attributes assigned to an edited area represented by this delta.

insert: *const YInput

Used in case when current change is of Y_EVENT_CHANGE_ADD type. Contains a list (of length stored in len field) of newly inserted values.