swift-casification

Package for tokenizing and case swapping for free strings

Usage

There are a bunch of predefined case modifiers that you can use out of the box

Basic

Modifiers	Examples
upper	string -> STRING
lower	STRING → string
upperFirst	strinG → StrinG
lowerFirst	STRINg → sTRINg
capital	some string → Some String
swap	Some String → sOME sTRING

Any case modifiers can be combined with other ones by calling combined(with:), keep in mind that the order matters and transformations are applied sequentially

"myString".case(.lower.combined(with: .upperFirst)) // Mystring

Programming

Those modifiers are a bit more compex and do support configuration

• String.Casification.PrefixPredicate allows to configure allowed prefixes, .swiftDeclarations is used by default allowing $ and _ symbols for prefixes
• You can also pass list of acronyms, default list can be found here String.Casification.standardAcronyms, there is no way to modify this list at least yet, but you can explicitly specify your own, we'll add modification mechanism in future versions of the library

Modifiers	Examples
camel(.camel)	some string → someString
camel(.pascal)	some string → SomeString
camel	some string → someString
pascal	some string → SomeString
camel(.automatic)	some string → someString
camel(.automatic)	Some string → SomeString
snake()	some string → some_string
kebab()	some string → some-string
dot()	some string → some.string

Note

Check out Tests for more examples

Creating custom modifiers

For simple modifiers conforming your types to String.Casification.Modifier should be enough

extension String.Casification.Modifiers {
  public struct Delete: String.Casification.Modifier {
    public init() {}
    
    @inlinable 
    public func transform(_ input: Substring) -> Substring {
      ""
    }
  }
}

extension String.Casification.Modifier
where Self == String.Casification.Modifiers.Delete {
  @inlinable
  public var delete: Self { .init() }
}

func test() {
  "myString".case(.delete) // ""
}

For complex processing you can process tokens instead of raw strings by creating a type conforming to String.Casification.TokensProcessor

extension String.Casification.TokensProcessors {
  public struct RemoveSeparators: String.Casification.TokensProcessor {
    public init() {}
    @inlinable
    public func processTokens(
      _ tokens: ArraySlice<String.Casification.Token>
    ) -> ArraySlice<String.Casification.Token> {
      return filter { $0.kind != .separator }[...]
    }
  }
}

// This declaration looks heavy, but allows to
// create a modifier from tokens processor without
// creating a separate modifier type
extension String.Casification.Modifier
where Self == String.Casification.Modifier.ProcessingTokens<
  String.Casification.TokensProcessors.RemoveSeparators
>{
  @inlinable
  public var noSeparators: Self {
    .init(using: .init())
  }
}

func test() {
  "my test-string".case(.noSeparators.combined(with: .upper)) // "MYTESTSTRING"
}

Installation

Basic

You can add Casification to an Xcode project by adding it as a package dependency.

1. From the File menu, select Swift Packages › Add Package Dependency…
2. Enter "https://github.com/capturecontext/swift-casification.git" into the package repository URL text field
3. Choose products you need to link them to your project.

Recommended

If you use SwiftPM for your project, you can add StandardExtensions to your package file.

.package(
  url: "https://github.com/capturecontext/swift-casification.git", 
  .upToNextMinor(from: "0.0.1")
)

Do not forget about target dependencies:

.product(
  name: "Casification", 
  package: "swift-casification"
)

License

This library is released under the MIT license. See LICENSE for details.