| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| part of dart.ui; |
| |
| // Examples can assume: |
| // // ignore_for_file: deprecated_member_use |
| // int foo = 0; |
| // int bar = 0; |
| // List<int> quux = <int>[]; |
| // int baz = 0; |
| |
| class _HashEnd { const _HashEnd(); } |
| const _HashEnd _hashEnd = _HashEnd(); |
| |
| // ignore: avoid_classes_with_only_static_members |
| /// Jenkins hash function, optimized for small integers. |
| // |
| // Borrowed from the dart sdk: sdk/lib/math/jenkins_smi_hash.dart. |
| class _Jenkins { |
| static int combine(int hash, Object? o) { |
| assert(o is! Iterable); |
| hash = 0x1fffffff & (hash + o.hashCode); |
| hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10)); |
| return hash ^ (hash >> 6); |
| } |
| |
| static int finish(int hash) { |
| hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3)); |
| hash = hash ^ (hash >> 11); |
| return 0x1fffffff & (hash + ((0x00003fff & hash) << 15)); |
| } |
| } |
| |
| /// Combine up to twenty objects' hash codes into one value. |
| /// |
| /// If you only need to handle one object's hash code, then just refer to its |
| /// [Object.hashCode] getter directly. |
| /// |
| /// If you need to combine an arbitrary number of objects from a [List] or other |
| /// [Iterable], use [hashList]. The output of [hashList] can be used as one of |
| /// the arguments to this function. |
| /// |
| /// For example: |
| /// |
| /// ```dart |
| /// int get hashCode => hashValues(foo, bar, hashList(quux), baz); |
| /// ``` |
| /// |
| /// ## Deprecation |
| /// |
| /// This function has been replaced by [Object.hash], so that it can be used |
| /// outside of Flutter as well. The new function is a drop-in replacement. |
| /// |
| /// The [hashList] function has also been replaced, [Object.hashAll] is the new |
| /// function. The example above therefore is better written as: |
| /// |
| /// ```dart |
| /// int get hashCode => Object.hash(foo, bar, Object.hashAll(quux), baz); |
| /// ``` |
| /// |
| /// If `quux` in this example was nullable, then it would need special handling, |
| /// because [Object.hashAll]'s argument is not nullable: |
| /// |
| /// ```dart |
| /// int get hashCode => Object.hash(foo, bar, quux == null ? null : Object.hashAll(quux), baz); |
| /// ``` |
| @Deprecated( |
| 'Use Object.hash() instead. ' |
| 'This feature was deprecated in v3.1.0-0.0.pre.897' |
| ) |
| int hashValues( |
| Object? arg01, Object? arg02, [ Object? arg03 = _hashEnd, |
| Object? arg04 = _hashEnd, Object? arg05 = _hashEnd, Object? arg06 = _hashEnd, |
| Object? arg07 = _hashEnd, Object? arg08 = _hashEnd, Object? arg09 = _hashEnd, |
| Object? arg10 = _hashEnd, Object? arg11 = _hashEnd, Object? arg12 = _hashEnd, |
| Object? arg13 = _hashEnd, Object? arg14 = _hashEnd, Object? arg15 = _hashEnd, |
| Object? arg16 = _hashEnd, Object? arg17 = _hashEnd, Object? arg18 = _hashEnd, |
| Object? arg19 = _hashEnd, Object? arg20 = _hashEnd ]) { |
| int result = 0; |
| result = _Jenkins.combine(result, arg01); |
| result = _Jenkins.combine(result, arg02); |
| if (!identical(arg03, _hashEnd)) { |
| result = _Jenkins.combine(result, arg03); |
| if (!identical(arg04, _hashEnd)) { |
| result = _Jenkins.combine(result, arg04); |
| if (!identical(arg05, _hashEnd)) { |
| result = _Jenkins.combine(result, arg05); |
| if (!identical(arg06, _hashEnd)) { |
| result = _Jenkins.combine(result, arg06); |
| if (!identical(arg07, _hashEnd)) { |
| result = _Jenkins.combine(result, arg07); |
| if (!identical(arg08, _hashEnd)) { |
| result = _Jenkins.combine(result, arg08); |
| if (!identical(arg09, _hashEnd)) { |
| result = _Jenkins.combine(result, arg09); |
| if (!identical(arg10, _hashEnd)) { |
| result = _Jenkins.combine(result, arg10); |
| if (!identical(arg11, _hashEnd)) { |
| result = _Jenkins.combine(result, arg11); |
| if (!identical(arg12, _hashEnd)) { |
| result = _Jenkins.combine(result, arg12); |
| if (!identical(arg13, _hashEnd)) { |
| result = _Jenkins.combine(result, arg13); |
| if (!identical(arg14, _hashEnd)) { |
| result = _Jenkins.combine(result, arg14); |
| if (!identical(arg15, _hashEnd)) { |
| result = _Jenkins.combine(result, arg15); |
| if (!identical(arg16, _hashEnd)) { |
| result = _Jenkins.combine(result, arg16); |
| if (!identical(arg17, _hashEnd)) { |
| result = _Jenkins.combine(result, arg17); |
| if (!identical(arg18, _hashEnd)) { |
| result = _Jenkins.combine(result, arg18); |
| if (!identical(arg19, _hashEnd)) { |
| result = _Jenkins.combine(result, arg19); |
| if (!identical(arg20, _hashEnd)) { |
| result = _Jenkins.combine(result, arg20); |
| // I can see my house from here! |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| return _Jenkins.finish(result); |
| } |
| |
| /// Combine the [Object.hashCode] values of an arbitrary number of objects from |
| /// an [Iterable] into one value. This function will return the same value if |
| /// given null as if given an empty list. |
| /// |
| /// ## Deprecation |
| /// |
| /// This function has been replaced by [Object.hashAll], so that it can be used |
| /// outside of Flutter as well. The new function is a drop-in replacement, except |
| /// that the argument must not be null. |
| /// |
| /// There is also a new function, [Object.hashAllUnordered], which is similar |
| /// but returns the same hash code regardless of the order of the elements in |
| /// the provided iterable. |
| @Deprecated( |
| 'Use Object.hashAll() or Object.hashAllUnordered() instead. ' |
| 'This feature was deprecated in v3.1.0-0.0.pre.897' |
| ) |
| int hashList(Iterable<Object?>? arguments) { |
| int result = 0; |
| if (arguments != null) { |
| for (final Object? argument in arguments) { |
| result = _Jenkins.combine(result, argument); |
| } |
| } |
| return _Jenkins.finish(result); |
| } |
