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| 1 // Copyright 2014 Google Inc. All Rights Reserved. |
| 2 // |
| 3 // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 // you may not use this file except in compliance with the License. |
| 5 // You may obtain a copy of the License at |
| 6 // |
| 7 // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 // |
| 9 // Unless required by applicable law or agreed to in writing, software |
| 10 // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 // See the License for the specific language governing permissions and |
| 13 // limitations under the License. |
| 14 |
| 15 part of quiver.iterables; |
| 16 |
| 17 /// Partitions the input iterable into lists of the specified size. |
| 18 Iterable<List> partition(Iterable iterable, int size) { |
| 19 if (size <= 0) throw new ArgumentError(size); |
| 20 return _partition(iterable, size); |
| 21 } |
| 22 |
| 23 Iterable<List> _partition(Iterable iterable, int size) sync* { |
| 24 if (iterable.isEmpty) return; |
| 25 var iterator = iterable.iterator; |
| 26 iterator.moveNext(); |
| 27 var first = iterator.current; |
| 28 while (true) { |
| 29 var part = [first]; |
| 30 for (var i = 0; i < size - 1; i++) { |
| 31 if (!iterator.moveNext()) { |
| 32 yield part; |
| 33 return; |
| 34 } |
| 35 part.add(iterator.current); |
| 36 } |
| 37 yield part; |
| 38 if (iterator.moveNext()) { |
| 39 first = iterator.current; |
| 40 } else { |
| 41 return; |
| 42 } |
| 43 } |
| 44 } |
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