Struct Delta 

pub struct Delta {
    pub changed: HashMap<String, ValueWord>,
    pub removed: Vec<String>,
}

A delta between two values, keyed by content path.

Paths use dot-separated notation:

• "field_name" for top-level fields of a TypedObject
• "field_name.nested" for nested fields
• "[0]", "[1]" for array indices
• "frames.[0].locals.[2]" for deeply nested paths

Fields

changed: HashMap<String, ValueWord>

Fields/paths that changed, mapped to their new values.

removed: Vec<String>

Paths that were removed (present in old, absent in new).

Implementations

impl Delta

pub fn empty() -> Self

Create an empty delta (no changes).

pub fn is_empty(&self) -> bool

True if this delta represents no change.

pub fn change_count(&self) -> usize

Number of changes (additions + modifications + removals).

pub fn patch( &self, base: &ValueWord, schemas: &TypeSchemaRegistry, ) -> (ValueWord, Vec<String>)

Apply this delta to a base value, producing the updated value.

This is a convenience wrapper around patch_value that validates delta paths before applying. Invalid paths (empty segments, leading or trailing dots) are silently skipped.

Path validation

Each path in changed and removed is checked for basic structural validity:

• Must not be empty (except the root sentinel ".").
• Must not contain empty segments (e.g. "a..b").
• Must not start or end with "." (except the root sentinel).

Paths that fail validation are excluded from the applied delta and collected into the returned Vec of rejected path strings.

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.