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Informations about the package specification-php

Specification Pattern

Encapsulate your business decisions for readable, clear, and maintainable purposes. In simpler words: encapsulate your business's IF's and ELSE's, and speak with clients on the same language.

Read it if you are not familiar with Specification pattern [http://www.martinfowler.com/apsupp/spec.pdf].

This library has no dependencies on any external libs and works on PHP 5.5+. Why? Because legacy projects still exists, and they also want some structure.

Install

Usage

Let's imagine that we have the specification of an Adult Person.

Now let's check if the user is actually an adult.

Use TypedSpecification decorator/wrapper if you want typed specification.

TypedSpecification VS public function isSatisfiedBy(User $candidate)

Of course, you can create your own specification interfaces with type hinting in isSatisfiedBy, but sooner or later you will see a lot of interfaces that are similar by 99%.

Or you can use TypedSpecification decorator to achieve the same goal.

Autocompletion

Use the doc-block type hinting in your end specifications for autocompletion, like @param User $candidate.

TypedSpecification guaranty that $candidate will be an instance of User class, and doc-block @param User $candidate helps your IDE to autocomplete $candidate methods.

Composition

This lib provides useful builtin specifications like NotSpecification, AndSpecification, OrSpecification, etc. (https://en.wikipedia.org/wiki/Logical_connective) that helps you to group up your specifications and create a new one.

Here is another example that shows how highly composable specifications could be.

Remainders

Method isSatisfiedBy returns bool, and sometimes in case of false you want to know what exactly has gone wrong. Use remainderUnsatisfiedBy method for that. It returns a remainder of unsatisfied specifications.

You can use Utils to convert it to useful array.

For example, you can use strings inside $remainder like high_value_parcel as a translation key to show meaningful error message.

License

Use as you want. No liability or warranty from me. Can be considered as MIT.

All versions of specification-php with dependencies

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Requires php Version >=5.5|^7|^8
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