Struct Delta 

pub struct Delta {
    pub start: usize,
    pub old: String,
    pub new: String,
}

A reversible edit between two adjacent buffer states, expressed as a single spanning replacement in char-offset space on the rope.

The index space is ropey char offsets throughout — never bytes — so multi-byte UTF-8 round-trips (a byte offset could split a codepoint). In the PARENT state chars[start .. start + old.chars().count()] == old; replacing that region with new yields the CHILD state, and swapping the two inverts it. A whole undo group collapses to the one region spanning its edits (common-prefix / common-suffix diff); a Vec<Delta> for disjoint regions is an acceptable future generalization, but one spanning region is all Phase 3a needs.

Fields

start: usize

Char offset of the first differing char (the common-prefix length).

old: String

Chars present in the PARENT but not the CHILD (removed going forward).

new: String

Chars present in the CHILD but not the PARENT (inserted going forward).

Trait Implementations

impl Clone for Delta

fn clone(&self) -> Delta

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Delta

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Delta

fn default() -> Delta

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Delta

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Delta

impl PartialEq for Delta

fn eq(&self, other: &Delta) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for Delta

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Delta