Delta class

Delta represents a document or a modification of a document as a sequence of insert, delete and retain operations.

Delta consisting of only "insert" operations is usually referred to as "document delta". When delta includes also "retain" or "delete" operations it is a "change delta".

Constructors

Delta()
Creates new empty Delta.
factory
Delta.from(Delta other)
Creates new Delta from other.
factory

Properties

first Operation
Returns the first Operation in this delta.
no setter
hashCode int
The hash code for this object.
no setteroverride
isEmpty bool
Returns true if this delta is empty.
no setter
isNotEmpty bool
Returns true if this delta is not empty.
no setter
last Operation
Returns the last Operation in this delta.
no setter
length int
Returns number of operations in this delta.
no setter
runtimeType Type
A representation of the runtime type of the object.
no setterinherited

Methods

compose(Delta other) Delta
Composes this delta with other and returns new Delta.
concat(Delta other) Delta
Concatenates other with this delta and returns the result.
delete(int count) → void
Delete count characters from current position.
diff(Delta other, {bool cleanupSemantic = true}) Delta
Returns a Delta containing differences between 2 Deltas. If cleanupSemantic is true (default), applies the following:
elementAt(int index) Operation
Returns Operation at specified index in this delta.
insert(dynamic data, [Map<String, dynamic>? attributes]) → void
Insert data at current position.
invert(Delta base) Delta
Inverts this delta against base.
map<T>(T f(Operation)) Iterable<T>
Returns a new lazy Iterable with elements that are created by calling f on each element of this Iterable in iteration order.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
push(Operation operation) → void
Pushes new operation into this delta.
retain(int count, [Map<String, dynamic>? attributes]) → void
Retain count of characters from current position.
slice(int start, [int? end]) Delta
Returns slice of this delta from start index (inclusive) to end (exclusive).
toJson() List
Returns JSON-serializable version of this delta.
toList() List<Operation>
Returns list of operations in this delta.
toString() String
A string representation of this object.
override
transform(Delta other, bool priority) Delta
Transforms other delta against operations in this delta.
transformPosition(int index, {bool force = true}) int
Transforms index against this delta.
trim() → void
Removes trailing retain operation with empty attributes, if present.

Operators

operator ==(dynamic other) bool
The equality operator.
override
operator [](int index) Operation
Returns Operation at specified index in this delta.

Static Methods

composeAttributes(Map<String, dynamic>? a, Map<String, dynamic>? b, {bool keepNull = false}) Map<String, dynamic>?
Composes two attribute sets.
diffAttributes(Map<String, dynamic>? a, Map<String, dynamic>? b) Map<String, dynamic>?
Returns diff between two attribute sets
fromJson(List data, {DataDecoder? dataDecoder}) Delta
Creates Delta from de-serialized JSON representation.
invertAttributes(Map<String, dynamic>? attr, Map<String, dynamic>? base) Map<String, dynamic>
get anti-attr result base on base
transformAttributes(Map<String, dynamic>? a, Map<String, dynamic>? b, bool priority) Map<String, dynamic>?
Transforms two attribute sets.