https://github.com/pschiffmann/lookaround-iterator.dart

Provides an iterator class with lookbehind and lookahead buffer.
https://github.com/pschiffmann/lookaround-iterator.dart

Last synced: 8 months ago
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Provides an iterator class with lookbehind and lookahead buffer.

• Host: GitHub
• URL: https://github.com/pschiffmann/lookaround-iterator.dart
• Owner: pschiffmann
• License: mit
• Created: 2017-08-13T01:05:22.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2018-11-08T18:14:21.000Z (over 7 years ago)
• Last Synced: 2025-10-22T23:54:24.705Z (8 months ago)
• Language: Dart
• Homepage: https://pub.dartlang.org/packages/lookaround_iterator
• Size: 7.81 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

          
Dart lookaround iterator

========================

[![Build Status](https://travis-ci.com/pschiffmann/lookaround-iterator.dart.svg?branch=master)](https://travis-ci.com/pschiffmann/lookaround-iterator.dart)

The `LookaroundIterator` class exposes a fixed number of elements in the past and future of the current iteration element.

```Dart

// `it` is an iterator over a list of the numbers 1..10, currently

// pointing at `4`.

final it = LookaroundIterator(

    List.generate(10, (n) => n + 1).iterator,

    lookbehind: 2,

    lookahead: 3)

  ..moveNext()

  ..moveNext()

  ..moveNext()

  ..moveNext();

// Prints _2, 3, 4, 5, 6, 7_.

// Notice the negative start index and the inclusive range `<=`.

for (int i = -it.lookbehind; i <= it.lookahead; i++) {

  print(it[i]);

}

```