Ellet
1 year ago
parent
2d84e72b3b
commit
358a13ffa5
20 changed files with 18 additions and 844 deletions
@ -1,3 +1,3 @@ |
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library flutter_quill.delta; |
library flutter_quill.delta; |
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export 'src/models/quill_delta.dart'; |
export 'package:dart_quill_delta/dart_quill_delta.dart'; |
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@ -1,829 +0,0 @@ |
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export 'package:dart_quill_delta/dart_quill_delta.dart'; |
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// /// Implementation of Quill Delta format in Dart. |
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// library; |
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// import 'dart:math' as math; |
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// import 'package:collection/collection.dart'; |
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// import 'package:diff_match_patch/diff_match_patch.dart' as dmp; |
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// import 'package:quiver/core.dart'; |
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// const _attributeEquality = DeepCollectionEquality(); |
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// const _valueEquality = DeepCollectionEquality(); |
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// /// Decoder function to convert raw `data` object into a user-defined data type. |
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// /// |
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// /// Useful with embedded content. |
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// typedef DataDecoder = Object? Function(Object data); |
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// /// Default data decoder which simply passes through the original value. |
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// Object? _passThroughDataDecoder(Object? data) => data; |
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// /// Operation performed on a rich-text document. |
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// class Operation { |
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// Operation._(this.key, this.length, this.data, Map? attributes) |
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// : assert(_validKeys.contains(key), 'Invalid operation key "$key".'), |
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// assert(() { |
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// if (key != Operation.insertKey) return true; |
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// return data is String ? data.length == length : length == 1; |
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// }(), 'Length of insert operation must be equal to the data length.'), |
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// _attributes = |
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// attributes != null ? Map<String, dynamic>.from(attributes) : null; |
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// /// Creates operation which deletes [length] of characters. |
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// factory Operation.delete(int length) => |
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// Operation._(Operation.deleteKey, length, '', null); |
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// /// Creates operation which inserts [text] with optional [attributes]. |
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// factory Operation.insert(dynamic data, [Map<String, dynamic>? attributes]) => |
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// Operation._(Operation.insertKey, data is String ? data.length : 1, data, |
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// attributes); |
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// /// Creates operation which retains [length] of characters and optionally |
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// /// applies attributes. |
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// factory Operation.retain(int? length, [Map<String, dynamic>? attributes]) => |
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// Operation._(Operation.retainKey, length, '', attributes); |
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// /// Key of insert operations. |
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// static const String insertKey = 'insert'; |
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// /// Key of delete operations. |
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// static const String deleteKey = 'delete'; |
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// /// Key of retain operations. |
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// static const String retainKey = 'retain'; |
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// /// Key of attributes collection. |
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// static const String attributesKey = 'attributes'; |
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// static const List<String> _validKeys = [insertKey, deleteKey, retainKey]; |
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// /// Key of this operation, can be "insert", "delete" or "retain". |
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// final String key; |
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// /// Length of this operation. |
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// final int? length; |
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// /// Payload of "insert" operation, for other types is set to empty string. |
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// final Object? data; |
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// /// Rich-text attributes set by this operation, can be `null`. |
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// Map<String, dynamic>? get attributes => |
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// _attributes == null ? null : Map<String, dynamic>.from(_attributes!); |
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// final Map<String, dynamic>? _attributes; |
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// /// Creates new [Operation] from JSON payload. |
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// /// |
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// /// If `dataDecoder` parameter is not null then it is used to additionally |
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// /// decode the operation's data object. Only applied to insert operations. |
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// static Operation fromJson(Map data, {DataDecoder? dataDecoder}) { |
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// dataDecoder ??= _passThroughDataDecoder; |
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// final map = Map<String, dynamic>.from(data); |
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// if (map.containsKey(Operation.insertKey)) { |
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// final data = dataDecoder(map[Operation.insertKey]); |
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// final dataLength = data is String ? data.length : 1; |
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// return Operation._( |
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// Operation.insertKey, dataLength, data, map[Operation.attributesKey]); |
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// } else if (map.containsKey(Operation.deleteKey)) { |
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// final int? length = map[Operation.deleteKey]; |
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// return Operation._(Operation.deleteKey, length, '', null); |
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// } else if (map.containsKey(Operation.retainKey)) { |
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// final int? length = map[Operation.retainKey]; |
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// return Operation._( |
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// Operation.retainKey, length, '', map[Operation.attributesKey]); |
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// } |
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// throw ArgumentError.value(data, 'Invalid data for Delta operation.'); |
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// } |
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// /// Returns JSON-serializable representation of this operation. |
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// Map<String, dynamic> toJson() { |
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// final json = {key: value}; |
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// if (_attributes != null) json[Operation.attributesKey] = attributes; |
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// return json; |
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// } |
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// /// Returns value of this operation. |
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// /// |
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// /// For insert operations this returns text, for delete and retain - length. |
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// dynamic get value => (key == Operation.insertKey) ? data : length; |
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// /// Returns `true` if this is a delete operation. |
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// bool get isDelete => key == Operation.deleteKey; |
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// /// Returns `true` if this is an insert operation. |
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// bool get isInsert => key == Operation.insertKey; |
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// /// Returns `true` if this is a retain operation. |
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// bool get isRetain => key == Operation.retainKey; |
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// /// Returns `true` if this operation has no attributes, e.g. is plain text. |
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// bool get isPlain => _attributes == null || _attributes!.isEmpty; |
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// /// Returns `true` if this operation sets at least one attribute. |
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// bool get isNotPlain => !isPlain; |
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// /// Returns `true` is this operation is empty. |
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// /// |
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// /// An operation is considered empty if its [length] is equal to `0`. |
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// bool get isEmpty => length == 0; |
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// /// Returns `true` is this operation is not empty. |
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// bool get isNotEmpty => length! > 0; |
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// @override |
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// bool operator ==(other) { |
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// if (identical(this, other)) return true; |
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// if (other is! Operation) return false; |
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// final typedOther = other; |
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// return key == typedOther.key && |
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// length == typedOther.length && |
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// _valueEquality.equals(data, typedOther.data) && |
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// hasSameAttributes(typedOther); |
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// } |
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// /// Returns `true` if this operation has attribute specified by [name]. |
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// bool hasAttribute(String name) => |
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// isNotPlain && _attributes!.containsKey(name); |
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// /// Returns `true` if [other] operation has the same attributes as this one. |
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// bool hasSameAttributes(Operation other) { |
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// // treat null and empty equal |
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// if ((_attributes?.isEmpty ?? true) && |
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// (other._attributes?.isEmpty ?? true)) { |
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// return true; |
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// } |
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// return _attributeEquality.equals(_attributes, other._attributes); |
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// } |
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// @override |
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// int get hashCode { |
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// if (_attributes != null && _attributes!.isNotEmpty) { |
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// final attrsHash = |
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// hashObjects(_attributes!.entries.map((e) => hash2(e.key, e.value))); |
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// return hash3(key, value, attrsHash); |
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// } |
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// return hash2(key, value); |
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// } |
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// @override |
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// String toString() { |
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// final attr = attributes == null ? '' : ' + $attributes'; |
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// final text = isInsert |
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// ? (data is String |
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// ? (data as String).replaceAll('\n', '⏎') |
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// : data.toString()) |
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// : '$length'; |
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// return '$key⟨ $text ⟩$attr'; |
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// } |
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// } |
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// /// Delta represents a document or a modification of a document as a sequence of |
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// /// insert, delete and retain operations. |
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// /// |
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// /// Delta consisting of only "insert" operations is usually referred to as |
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// /// "document delta". When delta includes also "retain" or "delete" operations |
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// /// it is a "change delta". |
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// class Delta { |
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// /// Creates new empty [Delta]. |
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// factory Delta() => Delta._(<Operation>[]); |
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// Delta._(List<Operation> operations) : _operations = operations; |
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// /// Creates new [Delta] from [other]. |
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// factory Delta.from(Delta other) => |
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// Delta._(List<Operation>.from(other._operations)); |
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// /// Creates new [Delta] from a List of Operation |
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// factory Delta.fromOperations(List<Operation> operations) => |
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// Delta._(operations.toList()); |
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// // Placeholder char for embed in diff() |
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// static final String _kNullCharacter = String.fromCharCode(0); |
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// /// Transforms two attribute sets. |
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// static Map<String, dynamic>? transformAttributes( |
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// Map<String, dynamic>? a, Map<String, dynamic>? b, bool priority) { |
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// if (a == null) return b; |
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// if (b == null) return null; |
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// if (!priority) return b; |
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// final result = b.keys.fold<Map<String, dynamic>>({}, (attributes, key) { |
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// if (!a.containsKey(key)) attributes[key] = b[key]; |
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// return attributes; |
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// }); |
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// return result.isEmpty ? null : result; |
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// } |
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// /// Composes two attribute sets. |
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// static Map<String, dynamic>? composeAttributes( |
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// Map<String, dynamic>? a, Map<String, dynamic>? b, |
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// {bool keepNull = false}) { |
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// a ??= const {}; |
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// b ??= const {}; |
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// final result = Map<String, dynamic>.from(a)..addAll(b); |
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// final keys = result.keys.toList(growable: false); |
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// if (!keepNull) { |
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// for (final key in keys) { |
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// if (result[key] == null) result.remove(key); |
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// } |
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// } |
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// return result.isEmpty ? null : result; |
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// } |
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// ///get anti-attr result base on base |
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// static Map<String, dynamic> invertAttributes( |
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// Map<String, dynamic>? attr, Map<String, dynamic>? base) { |
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// attr ??= const {}; |
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// base ??= const {}; |
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// final baseInverted = base.keys.fold({}, (dynamic memo, key) { |
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// if (base![key] != attr![key] && attr.containsKey(key)) { |
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// memo[key] = base[key]; |
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// } |
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// return memo; |
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// }); |
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// final inverted = |
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// Map<String, dynamic>.from(attr.keys.fold(baseInverted, (memo, key) { |
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// if (base![key] != attr![key] && !base.containsKey(key)) { |
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// memo[key] = null; |
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// } |
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// return memo; |
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// })); |
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// return inverted; |
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// } |
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// /// Returns diff between two attribute sets |
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// static Map<String, dynamic>? diffAttributes( |
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// Map<String, dynamic>? a, Map<String, dynamic>? b) { |
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// a ??= const {}; |
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// b ??= const {}; |
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// final attributes = <String, dynamic>{}; |
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// for (final key in (a.keys.toList()..addAll(b.keys))) { |
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// if (a[key] != b[key]) { |
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// attributes[key] = b.containsKey(key) ? b[key] : null; |
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// } |
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// } |
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// return attributes.keys.isNotEmpty ? attributes : null; |
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// } |
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// final List<Operation> _operations; |
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// int _modificationCount = 0; |
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// /// Creates [Delta] from de-serialized JSON representation. |
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// /// |
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// /// If `dataDecoder` parameter is not null then it is used to additionally |
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// /// decode the operation's data object. Only applied to insert operations. |
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// static Delta fromJson(List data, {DataDecoder? dataDecoder}) { |
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// return Delta._(data |
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// .map((op) => Operation.fromJson(op, dataDecoder: dataDecoder)) |
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// .toList()); |
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// } |
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// /// Returns list of operations in this delta. |
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// List<Operation> toList() => List.from(_operations); |
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// /// Returns JSON-serializable version of this delta. |
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// List toJson() => toList().map((operation) => operation.toJson()).toList(); |
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// /// Returns `true` if this delta is empty. |
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// bool get isEmpty => _operations.isEmpty; |
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// /// Returns `true` if this delta is not empty. |
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// bool get isNotEmpty => _operations.isNotEmpty; |
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// /// Returns number of operations in this delta. |
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// int get length => _operations.length; |
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// /// Returns [Operation] at specified [index] in this delta. |
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// Operation operator [](int index) => _operations[index]; |
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// /// Returns [Operation] at specified [index] in this delta. |
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// Operation elementAt(int index) => _operations.elementAt(index); |
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// /// Returns the first [Operation] in this delta. |
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// Operation get first => _operations.first; |
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// /// Returns the last [Operation] in this delta. |
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// Operation get last => _operations.last; |
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// @override |
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// bool operator ==(dynamic other) { |
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// if (identical(this, other)) return true; |
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// if (other is! Delta) return false; |
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// final typedOther = other; |
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// const comparator = ListEquality<Operation>(DefaultEquality<Operation>()); |
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// return comparator.equals(_operations, typedOther._operations); |
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// } |
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// @override |
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// int get hashCode => hashObjects(_operations); |
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// /// Retain [count] of characters from current position. |
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// void retain(int count, [Map<String, dynamic>? attributes]) { |
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// assert(count >= 0); |
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// if (count == 0) return; // no-op |
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// push(Operation.retain(count, attributes)); |
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// } |
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// /// Insert [data] at current position. |
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// void insert(dynamic data, [Map<String, dynamic>? attributes]) { |
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// if (data is String && data.isEmpty) return; // no-op |
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// push(Operation.insert(data, attributes)); |
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// } |
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// /// Delete [count] characters from current position. |
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// void delete(int count) { |
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// assert(count >= 0); |
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// if (count == 0) return; |
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// push(Operation.delete(count)); |
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// } |
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// void _mergeWithTail(Operation operation) { |
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// assert(isNotEmpty); |
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// assert(last.key == operation.key); |
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// assert(operation.data is String && last.data is String); |
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// final length = operation.length! + last.length!; |
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// final lastText = last.data as String; |
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// final opText = operation.data as String; |
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// final resultText = lastText + opText; |
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// final index = _operations.length; |
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// _operations.replaceRange(index - 1, index, [ |
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// Operation._(operation.key, length, resultText, operation.attributes), |
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// ]); |
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// } |
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// /// Pushes new operation into this delta. |
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// /// |
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// /// Performs compaction by composing [operation] with current tail operation |
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// /// of this delta, when possible. For instance, if current tail is |
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// /// `insert('abc')` and pushed operation is `insert('123')` then existing |
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// /// tail is replaced with `insert('abc123')` - a compound result of the two |
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// /// operations. |
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// void push(Operation operation) { |
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// if (operation.isEmpty) return; |
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// var index = _operations.length; |
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// final lastOp = _operations.isNotEmpty ? _operations.last : null; |
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// if (lastOp != null) { |
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// if (lastOp.isDelete && operation.isDelete) { |
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// _mergeWithTail(operation); |
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// return; |
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// } |
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// if (lastOp.isDelete && operation.isInsert) { |
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// index -= 1; // Always insert before deleting |
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// final nLastOp = (index > 0) ? _operations.elementAt(index - 1) : null; |
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// if (nLastOp == null) { |
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// _operations.insert(0, operation); |
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// return; |
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// } |
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// } |
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// if (lastOp.isInsert && operation.isInsert) { |
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// if (lastOp.hasSameAttributes(operation) && |
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// operation.data is String && |
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// lastOp.data is String) { |
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// _mergeWithTail(operation); |
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// return; |
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// } |
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// } |
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// if (lastOp.isRetain && operation.isRetain) { |
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// if (lastOp.hasSameAttributes(operation)) { |
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// _mergeWithTail(operation); |
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// return; |
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// } |
|
||||||
// } |
|
||||||
// } |
|
||||||
// if (index == _operations.length) { |
|
||||||
// _operations.add(operation); |
|
||||||
// } else { |
|
||||||
// final opAtIndex = _operations.elementAt(index); |
|
||||||
// _operations.replaceRange(index, index + 1, [operation, opAtIndex]); |
|
||||||
// } |
|
||||||
// _modificationCount++; |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Composes next operation from [thisIter] and [otherIter]. |
|
||||||
// /// |
|
||||||
// /// Returns new operation or `null` if operations from [thisIter] and |
|
||||||
// /// [otherIter] nullify each other. For instance, for the pair `insert('abc')` |
|
||||||
// /// and `delete(3)` composition result would be empty string. |
|
||||||
// Operation? _composeOperation( |
|
||||||
// DeltaIterator thisIter, DeltaIterator otherIter) { |
|
||||||
// if (otherIter.isNextInsert) return otherIter.next(); |
|
||||||
// if (thisIter.isNextDelete) return thisIter.next(); |
|
||||||
|
|
||||||
// final length = math.min(thisIter.peekLength(), otherIter.peekLength()); |
|
||||||
// final thisOp = thisIter.next(length); |
|
||||||
// final otherOp = otherIter.next(length); |
|
||||||
// assert(thisOp.length == otherOp.length); |
|
||||||
|
|
||||||
// if (otherOp.isRetain) { |
|
||||||
// final attributes = composeAttributes( |
|
||||||
// thisOp.attributes, |
|
||||||
// otherOp.attributes, |
|
||||||
// keepNull: thisOp.isRetain, |
|
||||||
// ); |
|
||||||
// if (thisOp.isRetain) { |
|
||||||
// return Operation.retain(thisOp.length, attributes); |
|
||||||
// } else if (thisOp.isInsert) { |
|
||||||
// return Operation.insert(thisOp.data, attributes); |
|
||||||
// } else { |
|
||||||
// throw StateError('Unreachable'); |
|
||||||
// } |
|
||||||
// } else { |
|
||||||
// // otherOp == delete && thisOp in [retain, insert] |
|
||||||
// assert(otherOp.isDelete); |
|
||||||
// if (thisOp.isRetain) return otherOp; |
|
||||||
// assert(thisOp.isInsert); |
|
||||||
// // otherOp(delete) + thisOp(insert) => null |
|
||||||
// } |
|
||||||
// return null; |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Composes this delta with [other] and returns new [Delta]. |
|
||||||
// /// |
|
||||||
// /// It is not required for this and [other] delta to represent a document |
|
||||||
// /// delta (consisting only of insert operations). |
|
||||||
// Delta compose(Delta other) { |
|
||||||
// final result = Delta(); |
|
||||||
// final thisIter = DeltaIterator(this); |
|
||||||
// final otherIter = DeltaIterator(other); |
|
||||||
|
|
||||||
// while (thisIter.hasNext || otherIter.hasNext) { |
|
||||||
// final newOp = _composeOperation(thisIter, otherIter); |
|
||||||
// if (newOp != null) result.push(newOp); |
|
||||||
// } |
|
||||||
// return result..trim(); |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Returns a new lazy Iterable with elements that are created by calling |
|
||||||
// /// f on each element of this Iterable in iteration order. |
|
||||||
// /// |
|
||||||
// /// Convenience method |
|
||||||
// Iterable<T> map<T>(T Function(Operation) f) { |
|
||||||
// return _operations.map<T>(f); |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Returns a [Delta] containing differences between 2 [Delta]s. |
|
||||||
// /// If [cleanupSemantic] is `true` (default), applies the following: |
|
||||||
// /// |
|
||||||
// /// The diff of "mouse" and "sofas" is |
|
||||||
// /// [delete(1), insert("s"), retain(1), |
|
||||||
// /// delete("u"), insert("fa"), retain(1), delete(1)]. |
|
||||||
// /// While this is the optimum diff, it is difficult for humans to understand. |
|
||||||
// /// Semantic cleanup rewrites the diff, |
|
||||||
// /// expanding it into a more intelligible format. |
|
||||||
// /// The above example would become: [(-1, "mouse"), (1, "sofas")]. |
|
||||||
// /// (source: https://github.com/google/diff-match-patch/wiki/API) |
|
||||||
// /// |
|
||||||
// /// Useful when one wishes to display difference between 2 documents |
|
||||||
// Delta diff(Delta other, {bool cleanupSemantic = true}) { |
|
||||||
// if (_operations.equals(other._operations)) { |
|
||||||
// return Delta(); |
|
||||||
// } |
|
||||||
// final stringThis = map((op) { |
|
||||||
// if (op.isInsert) { |
|
||||||
// return op.data is String ? op.data : _kNullCharacter; |
|
||||||
// } |
|
||||||
// final prep = this == other ? 'on' : 'with'; |
|
||||||
// throw ArgumentError('diff() call $prep non-document'); |
|
||||||
// }).join(); |
|
||||||
// final stringOther = other.map((op) { |
|
||||||
// if (op.isInsert) { |
|
||||||
// return op.data is String ? op.data : _kNullCharacter; |
|
||||||
// } |
|
||||||
// final prep = this == other ? 'on' : 'with'; |
|
||||||
// throw ArgumentError('diff() call $prep non-document'); |
|
||||||
// }).join(); |
|
||||||
|
|
||||||
// final retDelta = Delta(); |
|
||||||
// final diffResult = dmp.diff(stringThis, stringOther); |
|
||||||
// if (cleanupSemantic) { |
|
||||||
// dmp.DiffMatchPatch().diffCleanupSemantic(diffResult); |
|
||||||
// } |
|
||||||
|
|
||||||
// final thisIter = DeltaIterator(this); |
|
||||||
// final otherIter = DeltaIterator(other); |
|
||||||
|
|
||||||
// for (final component in diffResult) { |
|
||||||
// var length = component.text.length; |
|
||||||
// while (length > 0) { |
|
||||||
// var opLength = 0; |
|
||||||
// switch (component.operation) { |
|
||||||
// case dmp.DIFF_INSERT: |
|
||||||
// opLength = math.min(otherIter.peekLength(), length); |
|
||||||
// retDelta.push(otherIter.next(opLength)); |
|
||||||
// break; |
|
||||||
// case dmp.DIFF_DELETE: |
|
||||||
// opLength = math.min(length, thisIter.peekLength()); |
|
||||||
// thisIter.next(opLength); |
|
||||||
// retDelta.delete(opLength); |
|
||||||
// break; |
|
||||||
// case dmp.DIFF_EQUAL: |
|
||||||
// opLength = math.min( |
|
||||||
// math.min(thisIter.peekLength(), otherIter.peekLength()), |
|
||||||
// length, |
|
||||||
// ); |
|
||||||
// final thisOp = thisIter.next(opLength); |
|
||||||
// final otherOp = otherIter.next(opLength); |
|
||||||
// if (thisOp.data == otherOp.data) { |
|
||||||
// retDelta.retain( |
|
||||||
// opLength, |
|
||||||
// diffAttributes(thisOp.attributes, otherOp.attributes), |
|
||||||
// ); |
|
||||||
// } else { |
|
||||||
// retDelta |
|
||||||
// ..push(otherOp) |
|
||||||
// ..delete(opLength); |
|
||||||
// } |
|
||||||
// break; |
|
||||||
// } |
|
||||||
// length -= opLength; |
|
||||||
// } |
|
||||||
// } |
|
||||||
// return retDelta..trim(); |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Transforms next operation from [otherIter] against next operation in |
|
||||||
// /// [thisIter]. |
|
||||||
// /// |
|
||||||
// /// Returns `null` if both operations nullify each other. |
|
||||||
// Operation? _transformOperation( |
|
||||||
// DeltaIterator thisIter, DeltaIterator otherIter, bool priority) { |
|
||||||
// if (thisIter.isNextInsert && (priority || !otherIter.isNextInsert)) { |
|
||||||
// return Operation.retain(thisIter.next().length); |
|
||||||
// } else if (otherIter.isNextInsert) { |
|
||||||
// return otherIter.next(); |
|
||||||
// } |
|
||||||
|
|
||||||
// final length = math.min(thisIter.peekLength(), otherIter.peekLength()); |
|
||||||
// final thisOp = thisIter.next(length); |
|
||||||
// final otherOp = otherIter.next(length); |
|
||||||
// assert(thisOp.length == otherOp.length); |
|
||||||
|
|
||||||
// // At this point only delete and retain operations are possible. |
|
||||||
// if (thisOp.isDelete) { |
|
||||||
// // otherOp is either delete or retain, so they nullify each other. |
|
||||||
// return null; |
|
||||||
// } else if (otherOp.isDelete) { |
|
||||||
// return otherOp; |
|
||||||
// } else { |
|
||||||
// // Retain otherOp which is either retain or insert. |
|
||||||
// return Operation.retain( |
|
||||||
// length, |
|
||||||
// transformAttributes(thisOp.attributes, otherOp.attributes, priority), |
|
||||||
// ); |
|
||||||
// } |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Transforms [other] delta against operations in this delta. |
|
||||||
// Delta transform(Delta other, bool priority) { |
|
||||||
// final result = Delta(); |
|
||||||
// final thisIter = DeltaIterator(this); |
|
||||||
// final otherIter = DeltaIterator(other); |
|
||||||
|
|
||||||
// while (thisIter.hasNext || otherIter.hasNext) { |
|
||||||
// final newOp = _transformOperation(thisIter, otherIter, priority); |
|
||||||
// if (newOp != null) result.push(newOp); |
|
||||||
// } |
|
||||||
// return result..trim(); |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Removes trailing retain operation with empty attributes, if present. |
|
||||||
// void trim() { |
|
||||||
// if (isNotEmpty) { |
|
||||||
// final last = _operations.last; |
|
||||||
// if (last.isRetain && last.isPlain) _operations.removeLast(); |
|
||||||
// } |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Removes trailing '\n' |
|
||||||
// void _trimNewLine() { |
|
||||||
// if (isNotEmpty) { |
|
||||||
// final lastOp = _operations.last; |
|
||||||
// final lastOpData = lastOp.data; |
|
||||||
|
|
||||||
// if (lastOpData is String && lastOpData.endsWith('\n')) { |
|
||||||
// _operations.removeLast(); |
|
||||||
// if (lastOpData.length > 1) { |
|
||||||
// insert(lastOpData.substring(0, lastOpData.length - 1), |
|
||||||
// lastOp.attributes); |
|
||||||
// } |
|
||||||
// } |
|
||||||
// } |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Concatenates [other] with this delta and returns the result. |
|
||||||
// Delta concat(Delta other, {bool trimNewLine = false}) { |
|
||||||
// final result = Delta.from(this); |
|
||||||
// if (trimNewLine) { |
|
||||||
// result._trimNewLine(); |
|
||||||
// } |
|
||||||
// if (other.isNotEmpty) { |
|
||||||
// // In case first operation of other can be merged with last operation in |
|
||||||
// // our list. |
|
||||||
// result.push(other._operations.first); |
|
||||||
// result._operations.addAll(other._operations.sublist(1)); |
|
||||||
// } |
|
||||||
// return result; |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Inverts this delta against [base]. |
|
||||||
// /// |
|
||||||
// /// Returns new delta which negates effect of this delta when applied to |
|
||||||
// /// [base]. This is an equivalent of "undo" operation on deltas. |
|
||||||
// Delta invert(Delta base) { |
|
||||||
// final inverted = Delta(); |
|
||||||
// if (base.isEmpty) return inverted; |
|
||||||
|
|
||||||
// var baseIndex = 0; |
|
||||||
// for (final op in _operations) { |
|
||||||
// if (op.isInsert) { |
|
||||||
// inverted.delete(op.length!); |
|
||||||
// } else if (op.isRetain && op.isPlain) { |
|
||||||
// inverted.retain(op.length!); |
|
||||||
// baseIndex += op.length!; |
|
||||||
// } else if (op.isDelete || (op.isRetain && op.isNotPlain)) { |
|
||||||
// final length = op.length!; |
|
||||||
// final sliceDelta = base.slice(baseIndex, baseIndex + length); |
|
||||||
// sliceDelta.toList().forEach((baseOp) { |
|
||||||
// if (op.isDelete) { |
|
||||||
// inverted.push(baseOp); |
|
||||||
// } else if (op.isRetain && op.isNotPlain) { |
|
||||||
// final invertAttr = |
|
||||||
// invertAttributes(op.attributes, baseOp.attributes); |
|
||||||
// inverted.retain( |
|
||||||
// baseOp.length!, invertAttr.isEmpty ? null : invertAttr); |
|
||||||
// } |
|
||||||
// }); |
|
||||||
// baseIndex += length; |
|
||||||
// } else { |
|
||||||
// throw StateError('Unreachable'); |
|
||||||
// } |
|
||||||
// } |
|
||||||
// inverted.trim(); |
|
||||||
// return inverted; |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Returns slice of this delta from [start] index (inclusive) to [end] |
|
||||||
// /// (exclusive). |
|
||||||
// Delta slice(int start, [int? end]) { |
|
||||||
// final delta = Delta(); |
|
||||||
// var index = 0; |
|
||||||
// final opIterator = DeltaIterator(this); |
|
||||||
|
|
||||||
// final actualEnd = end ?? DeltaIterator.maxLength; |
|
||||||
|
|
||||||
// while (index < actualEnd && opIterator.hasNext) { |
|
||||||
// Operation op; |
|
||||||
// if (index < start) { |
|
||||||
// op = opIterator.next(start - index); |
|
||||||
// } else { |
|
||||||
// op = opIterator.next(actualEnd - index); |
|
||||||
// delta.push(op); |
|
||||||
// } |
|
||||||
// index += op.length!; |
|
||||||
// } |
|
||||||
// return delta; |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Transforms [index] against this delta. |
|
||||||
// /// |
|
||||||
// /// Any "delete" operation before specified [index] shifts it backward, as |
|
||||||
// /// well as any "insert" operation shifts it forward. |
|
||||||
// /// |
|
||||||
// /// The [force] argument is used to resolve scenarios when there is an |
|
||||||
// /// insert operation at the same position as [index]. If [force] is set to |
|
||||||
// /// `true` (default) then position is forced to shift forward, otherwise |
|
||||||
// /// position stays at the same index. In other words setting [force] to |
|
||||||
// /// `false` gives higher priority to the transformed position. |
|
||||||
// /// |
|
||||||
// /// Useful to adjust caret or selection positions. |
|
||||||
// int transformPosition(int index, {bool force = true}) { |
|
||||||
// final iter = DeltaIterator(this); |
|
||||||
// var offset = 0; |
|
||||||
// while (iter.hasNext && offset <= index) { |
|
||||||
// final op = iter.next(); |
|
||||||
// if (op.isDelete) { |
|
||||||
// index -= math.min(op.length!, index - offset); |
|
||||||
// continue; |
|
||||||
// } else if (op.isInsert && (offset < index || force)) { |
|
||||||
// index += op.length!; |
|
||||||
// } |
|
||||||
// offset += op.length!; |
|
||||||
// } |
|
||||||
// return index; |
|
||||||
// } |
|
||||||
|
|
||||||
// @override |
|
||||||
// String toString() => _operations.join('\n'); |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Specialized iterator for [Delta]s. |
|
||||||
// class DeltaIterator { |
|
||||||
// DeltaIterator(this.delta) : _modificationCount = delta._modificationCount; |
|
||||||
|
|
||||||
// static const int maxLength = 1073741824; |
|
||||||
|
|
||||||
// final Delta delta; |
|
||||||
// final int _modificationCount; |
|
||||||
// int _index = 0; |
|
||||||
// int _offset = 0; |
|
||||||
|
|
||||||
// bool get isNextInsert => nextOperationKey == Operation.insertKey; |
|
||||||
|
|
||||||
// bool get isNextDelete => nextOperationKey == Operation.deleteKey; |
|
||||||
|
|
||||||
// bool get isNextRetain => nextOperationKey == Operation.retainKey; |
|
||||||
|
|
||||||
// String? get nextOperationKey { |
|
||||||
// if (_index < delta.length) { |
|
||||||
// return delta.elementAt(_index).key; |
|
||||||
// } else { |
|
||||||
// return null; |
|
||||||
// } |
|
||||||
// } |
|
||||||
|
|
||||||
// bool get hasNext => peekLength() < maxLength; |
|
||||||
|
|
||||||
// /// Returns length of next operation without consuming it. |
|
||||||
// /// |
|
||||||
// /// Returns [maxLength] if there is no more operations left to iterate. |
|
||||||
// int peekLength() { |
|
||||||
// if (_index < delta.length) { |
|
||||||
// final operation = delta._operations[_index]; |
|
||||||
// return operation.length! - _offset; |
|
||||||
// } |
|
||||||
// return maxLength; |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Consumes and returns next operation. |
|
||||||
// /// |
|
||||||
// /// Optional [length] specifies maximum length of operation to return. Note |
|
||||||
// /// that actual length of returned operation may be less than specified value. |
|
||||||
// /// |
|
||||||
// /// If this iterator reached the end of the Delta then returns a retain |
|
||||||
// /// operation with its length set to [maxLength]. |
|
||||||
// // TODO: Note that we used double.infinity as the default value |
|
||||||
// // for length here |
|
||||||
// // but this can now cause a type error since operation length is |
|
||||||
// // expected to be an int. Changing default length to [maxLength] is |
|
||||||
// // a workaround to avoid breaking changes. |
|
||||||
// Operation next([int length = maxLength]) { |
|
||||||
// if (_modificationCount != delta._modificationCount) { |
|
||||||
// throw ConcurrentModificationError(delta); |
|
||||||
// } |
|
||||||
|
|
||||||
// if (_index < delta.length) { |
|
||||||
// final op = delta.elementAt(_index); |
|
||||||
// final opKey = op.key; |
|
||||||
// final opAttributes = op.attributes; |
|
||||||
// final currentOffset = _offset; |
|
||||||
// final actualLength = math.min(op.length! - currentOffset, length); |
|
||||||
// if (actualLength == op.length! - currentOffset) { |
|
||||||
// _index++; |
|
||||||
// _offset = 0; |
|
||||||
// } else { |
|
||||||
// _offset += actualLength; |
|
||||||
// } |
|
||||||
// final opData = op.isInsert && op.data is String |
|
||||||
// ? (op.data as String) |
|
||||||
// .substring(currentOffset, currentOffset + actualLength) |
|
||||||
// : op.data; |
|
||||||
// final opIsNotEmpty = |
|
||||||
// opData is String ? opData.isNotEmpty : true; // embeds are never empty |
|
||||||
// final opLength = opData is String ? opData.length : 1; |
|
||||||
// final opActualLength = opIsNotEmpty ? opLength : actualLength; |
|
||||||
// return Operation._(opKey, opActualLength, opData, opAttributes); |
|
||||||
// } |
|
||||||
// return Operation.retain(length); |
|
||||||
// } |
|
||||||
|
|
||||||
// /// Skips [length] characters in source delta. |
|
||||||
// /// |
|
||||||
// /// Returns last skipped operation, or `null` if there was nothing to skip. |
|
||||||
// Operation? skip(int length) { |
|
||||||
// var skipped = 0; |
|
||||||
// Operation? op; |
|
||||||
// while (skipped < length && hasNext) { |
|
||||||
// final opLength = peekLength(); |
|
||||||
// final skip = math.min(length - skipped, opLength); |
|
||||||
// op = next(skip); |
|
||||||
// skipped += op.length!; |
|
||||||
// } |
|
||||||
// return op; |
|
||||||
// } |
|
||||||
// } |
|
||||||
Loading…
Reference in new issue