SafeTypesMacros

SafeTypesMacros is a Swift package that extends SafeTypes by adding macro literal initializers for its types.

By ensuring conditions at compile time, SafeTypes allows developers to write safer, more robust and expressive code with reduced boilerplate, increased performance, and improved documentation through its constrained types.

SafeTypes is awesome and Macros makes it even more so.

Features

Macros for non optional initializers for SafeTypes custom data types through literals (values checked at compile time).
Type-safe containers that prevent invalid states
Enforced runtime constraints at compile time
Enhanced code readability and maintainability
Simplified method interfaces and APIs
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 simply Select File > Add Package Dependencies, and enter the following URL:

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

If you are manipulating the resulting data type I recommend installing the SafeTypes library itself 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

Fork the Project
Create your Branch (git checkout -b your_branch_name)
Commit your Changes (git commit -m 'Add some amazing feature')
Push to the Branch (git push origin your_branch_name)
Open a Pull Request
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:

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!