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.
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) Delta
Concatenates other with this delta and returns the result.
delete(int count) → void
Delete count characters from current position.
elementAt(int index) Operation
Returns Operation at specified index in this delta.
insert(String text, [Map<String, dynamic> attributes]) → void
Insert text at current position.
invert(Delta base) Delta
Inverts this delta against base. [...]
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
Returns 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.
fromJson(List data) 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.