Merge pull request #15 from MaxGoryunov/feature/13

Feature/13

Author: MaxGoryunov

README.md

@@ -1,2 +1,82 @@
-# saving-iterator
-True Caching Iterator for PHP.
+[![EO principles respected here](https://www.elegantobjects.org/badge.svg)](https://www.elegantobjects.org)
+
+![PHP-Composer-Build](https://github.com/MaxGoryunov/saving-iterator/actions/workflows/php.yml/badge.svg)
+[![Latest Stable Version](http://poser.pugx.org/maxgoryunov/saving-iterator/v)](https://packagist.org/packages/maxgoryunov/saving-iterator)
+[![Maintainability](https://api.codeclimate.com/v1/badges/d721a5fca4901010520e/maintainability)](https://codeclimate.com/github/MaxGoryunov/saving-iterator/maintainability)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/MaxGoryunov/saving-iterator/badges/quality-score.png?b=main)](https://scrutinizer-ci.com/g/MaxGoryunov/saving-iterator/?branch=main)
+[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://github.com/MaxGoryunov/saving-iterator/blob/main/LICENSE)
+
+[![Hits-of-Code](https://hitsofcode.com/github/MaxGoryunov/saving-iterator?branch=main)](https://hitsofcode.com/github/MaxGoryunov/saving-iterator/view)
+![Lines-of-Code](https://tokei.rs/b1/github/MaxGoryunov/saving-iterator?branch=main)
+
+**Saving Iterator** is a true caching iterator for PHP. It aims to solve the same problems as PHP's [Caching Iterator](https://www.php.net/manual/ru/class.cachingiterator.php) but with a [better encapsulation of data](https://www.yegor256.com/2016/11/21/naked-data.html) in mind. It has properties of both `Iterator` and `array`.
+
+## How to use
+
+Require it with Composer:
+
+```bash
+composer require maxgoryunov/saving-iterator
+```
+
+Then include this in your `index.php` or any other main file:
+
+```PHP
+require __DIR__ . "./vendor/autoload.php";
+```
+
+If you have any questions, ask them at [Discussions](https://github.com/MaxGoryunov/saving-iterator/discussions).
+
+## Decorating Iterators
+
+Any object with `Iterator` interface is suitable:
+
+```PHP
+$squares = new SavingIterator(
+    new SquaringIterator(
+        [1, 2, 3, 4, 5, 6]
+    )
+);
+```
+
+If the origin object is not an `Iterator` then wrap it in `TransparentIterator`:
+
+```PHP
+$wrapped = new SavingIterator(
+    new TransparentIterator($origin)
+);
+```
+
+## Decorating Generators
+
+You can also use it with `Generators`. If the iterator is called twice, rewind exception will **not** be thrown.
+
+**Attention**: it is not (currently) possible to pass callable as a parameter. You have to manually invoke `Generator` function:
+
+```PHP
+function numerals(): Generator {
+    for ($i = 0; $i < 10; $i++) {
+        yield $i;
+    }
+}
+
+$numerals = new SavingIterator(numerals());
+```
+
+## How to contribute
+
+[Fork this repository](https://docs.github.com/en/get-started/quickstart/fork-a-repo), then create a folder for it and install [Composer](https://getcomposer.org/download/) if you do not have it.
+
+Clone this repository:
+
+```git
+git clone https://github.com/MaxGoryunov/saving-iterator
+```
+
+Then run:
+
+```bash
+composer install
+```
+
+This command will install all dependencies required for development. Make changes and [open a pull request](https://github.com/MaxGoryunov/saving-iterator/pulls). Your PR will be reviewed and accepted if it does not fail our build.