Contents

lucaswkuipers/safetypesmacros

SafeTypesMacros is a _Swift_ package that extends [SafeTypes](https://github.com/lucaswkuipers/SafeTypes) by adding macro literal initializers for its types.

Features

  • Macros for non optional initializers for SafeTypes custom data types through literals (values checked at compile time).
  • [x] Type-safe containers that prevent invalid states
  • [x] Enforced runtime constraints at compile time
  • [x] Enhanced code readability and maintainability
  • [x] Simplified method interfaces and APIs
  • [x] Streamlined unit testing by eliminating redundant unhappy-path checks

Installation

Swift Package Manager

Add the following to your Package.swift file's dependencies:

.package(url: "https://github.com/lucaswkuipers/SafeTypesMacros.git", from: "1.0.0")

Or File > Add Package Dependencies, and enter the following URL:

https://github.com/lucaswkuipers/SafeTypesMacros.git

If you are manipulating the resulting data type it's recommended installing the SafeTypes base library too:

.package(url: "https://github.com/lucaswkuipers/SafeTypes.git", from: "1.0.0")

or File > Add Package Dependencies, and enter the following URL:

https://github.com/lucaswkuipers/SafeTypes.git

And then import wherever needed: 

import SafeTypesMacros
import SafeTypes // Optionally

Usage

Below are some of the Macros provided for SafeTypes and brief examples of their usage:

Collections

NonEmptyString

Macro for string that's guaranteed to contain at least one character (can be blank or invisible character).

// ✅ Compiles

#NonEmptyString("Alice") // NonEmptyString
#NonEmptyString(" Bob ") // NonEmptyString
#NonEmptyString(" ") // NonEmptyString

// ❌ Fails

#NonEmptyString("") // String can't be empty
#NonEmptyString() // No argument

Numbers

Where number is:

typealias Number = Numeric & Comparable
Positive

Macro for a number that is guaranteed to be greater than zero (value > 0)

// ✅ Compiles

#Positive(123) // Positive<Int>
#Positive(42.69) // Positive<Double>

// ❌ Fails

#Positive(-1) // Can't be negative
#Positive(0) // Can't be zero
#Positive() // No argument
Negative

Macro for A number that is guaranteed to be less than zero (value < 0)

// ✅ Compiles

#Negative(-123) // Negative<Int>
#Negative(-42.69) // Negative<Double>

// ❌ Fails

#Negative(1) // Can't be positive
#Negative(0) // Can't be zero
#Negative() // No argument
NonPositive

Macro for a number that is guaranteed to be less than or equal to zero (value <= 0)

// ✅ Compiles

#NonPositive(-123) // NonPositive<Int>
#NonPositive(-42.69) // NonPositive<Double>
#NonPositive(0) // NonPositive<Int>
#NonPositive(0.0) // NonPositive<Double>

// ❌ Fails

#NonPositive(1) // Can't be positive
#NonPositive() // No argument
NonNegative

Macro for number that is guaranteed to be greater than or equal to zero (value >= 0)

// ✅ Compiles

#NonNegative(123) // NonNegative<Int>
#NonNegative(42.69) // NonNegative<Double>
#NonNegative(0) // NonNegative<Int>
#NonNegative(0.0) // NonNegative<Double>

// ❌ Fails

#NonNegative(-273.15) // Can't be negative
#NonNegative() // No argument
NonZero

Macro for a number that is guaranteed to be different than zero (value != 0)

// ✅ Non Optional Initializers

#NonZero(123) // NonZero<Int>
#NonZero(42.69) // NonZero<Double>
#NonZero(-123) // NonZero<Int>
#NonZero(-42.69) // NonZero<Double>

// ❌ Fails to compile

#NonZero(0) // Can't be zero
#NonZero(0.0) // Can't be zero
#NonZero() // No argument
MinusOneToOne

Macro for number that's within the range of -1 to 1, inclusive. ([-1, 1])

// ✅ Compiles

#MinusOneToOne(-1) // MinusOneToOne<Int>
#MinusOneToOne(-1.0) // MinusOneToOne<Double>
#MinusOneToOne(-0.314159) // MinusOneToOne<Double>
#MinusOneToOne(0) // MinusOneToOne<Int>
#MinusOneToOne(0.0) // MinusOneToOne<Double>
#MinusOneToOne(0.1234) // MinusOneToOne<Double>
#MinusOneToOne(1) // MinusOneToOne<Double>

// ❌ Fails

#MinusOneToOne(-1.1) // Can't be less than -1
#MinusOneToOne(42.1) // Can't be greater than 1
#MinusOneToOne() // No Argument
ZeroToOne

Macro for number from 0 to 1, inclusive.

// ✅ Compiles
#ZeroToOne(0) // ZeroToOne<Int>
#ZeroToOne(0.0) // ZeroToOne<Double>
#ZeroToOne(0.1234) // ZeroToOne<Double>
#ZeroToOne(1) // ZeroToOne<Double>

// ❌ Fails

#ZeroToOne(-0.5) // Can't be less than 0
#ZeroToOne(42.1) // Can't be greater than 1
#ZeroToOne() // No argument

Each type guarantees compliance with its stated constraints so that your functions and methods can rely on those qualities and pass them on (preserving information).

Contributing

Contributions are what make the open-source community such a fantastic place to learn, inspire, and create. Any contributions you make are greatly appreciated.

What to contribute?

If you want to start contributing but don't know what to work on, try looking at the open Issues Tab

Steps to contribute

  1. Fork the Project
  2. Create your Branch (git checkout -b your_branch_name)
  3. Commit your Changes (git commit -m 'Add some amazing feature')
  4. Push to the Branch (git push origin your_branch_name)
  5. Open a Pull Request
  1. Oh and don't forget to add or update tests when applicable! :D

Thank you so much for contributing <3

License

Distributed under the MIT License. See LICENSE for more information.

Contact

Feel free to reach out to me:

[[image]](https://www.linkedin.com/in/lucaswk/)

Swift Package Iindex

SafeTypes can be found at Swift Package Index

Acknowledgements

Some of the relevant sources of inspiration:

Thank you so much for considering SafeTypes and SafeTypesMacros for your next Swift project – I hope you find it as enjoyable to use as I found it to write!

Package Metadata

Repository: lucaswkuipers/safetypesmacros

Default branch: master

README: README.md