Delta class Null safety

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.
read-only
hashCode int
The hash code for this object. [...]
read-only, override
isEmpty bool
Returns true if this delta is empty.
read-only
isNotEmpty bool
Returns true if this delta is not empty.
read-only
last Operation
Returns the last Operation in this delta.
read-only
length int
Returns number of operations in this delta.
read-only
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

compose(Delta other) Delta
Composes this delta with other and returns new Delta. [...]
concat(Delta other, {bool trimNewLine = false}) 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 non-existent 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.