99 lines
3.0 KiB
Markdown
99 lines
3.0 KiB
Markdown
composer/semver
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===============
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Semver (Semantic Versioning) library that offers utilities, version constraint parsing and validation.
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Originally written as part of [composer/composer](https://github.com/composer/composer),
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now extracted and made available as a stand-alone library.
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[](https://github.com/composer/semver/actions)
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Installation
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------------
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Install the latest version with:
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```bash
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$ composer require composer/semver
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```
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Requirements
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------------
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* PHP 5.3.2 is required but using the latest version of PHP is highly recommended.
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Version Comparison
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------------------
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For details on how versions are compared, refer to the [Versions](https://getcomposer.org/doc/articles/versions.md)
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article in the documentation section of the [getcomposer.org](https://getcomposer.org) website.
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Basic usage
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-----------
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### Comparator
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The [`Composer\Semver\Comparator`](https://github.com/composer/semver/blob/main/src/Comparator.php) class provides the following methods for comparing versions:
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* greaterThan($v1, $v2)
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* greaterThanOrEqualTo($v1, $v2)
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* lessThan($v1, $v2)
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* lessThanOrEqualTo($v1, $v2)
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* equalTo($v1, $v2)
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* notEqualTo($v1, $v2)
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Each function takes two version strings as arguments and returns a boolean. For example:
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```php
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use Composer\Semver\Comparator;
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Comparator::greaterThan('1.25.0', '1.24.0'); // 1.25.0 > 1.24.0
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```
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### Semver
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The [`Composer\Semver\Semver`](https://github.com/composer/semver/blob/main/src/Semver.php) class provides the following methods:
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* satisfies($version, $constraints)
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* satisfiedBy(array $versions, $constraint)
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* sort($versions)
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* rsort($versions)
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### Intervals
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The [`Composer\Semver\Intervals`](https://github.com/composer/semver/blob/main/src/Intervals.php) static class provides
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a few utilities to work with complex constraints or read version intervals from a constraint:
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```php
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use Composer\Semver\Intervals;
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// Checks whether $candidate is a subset of $constraint
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Intervals::isSubsetOf(ConstraintInterface $candidate, ConstraintInterface $constraint);
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// Checks whether $a and $b have any intersection, equivalent to $a->matches($b)
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Intervals::haveIntersections(ConstraintInterface $a, ConstraintInterface $b);
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// Optimizes a complex multi constraint by merging all intervals down to the smallest
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// possible multi constraint. The drawbacks are this is not very fast, and the resulting
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// multi constraint will have no human readable prettyConstraint configured on it
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Intervals::compactConstraint(ConstraintInterface $constraint);
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// Creates an array of numeric intervals and branch constraints representing a given constraint
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Intervals::get(ConstraintInterface $constraint);
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// Clears the memoization cache when you are done processing constraints
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Intervals::clear()
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```
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See the class docblocks for more details.
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License
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-------
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composer/semver is licensed under the MIT License, see the LICENSE file for details.
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