Defining dependencies with arguments

[brototyp]

This PR is a draft to have a discussion if this is a thing we want to add at all and how.

This PR adds support for dependencies with arguments. I am looking forward for any feedback and thoughts about this.

Usage

// Defining a resolvable
factory { LocalStorage(name: "default") as LocalStorageProtocol }
factory { name in LocalStorage(name: name) as LocalStorageProtocol }
factory { (args: (name: String, other: Int)) in LocalStorage(name: args.name) as LocalStorageProtocol }

// Resolving a depdendency
@Inject var defaultLocalStorage: LocalStorageProtocol
@Inject("With just one parameter") var localStorageWithJustOneParameter: LocalStorageProtocol
@Inject((name: "Local Storage with multiple parameters", other: 1)) var localStorageWithMultipleParameters: LocalStorageProtocol

let localStorage: LocalStorageProtocol = resolve("The name of the storage")

func doSomething(_ storage: LocalStorageProtocol = resolve("storage name")) { }

Implementation details

• Only factories can have an argument
• One cannot define a resolvable with a tag and arguments
• It is possible to define multiple resolvables of the same type with different arguments
• resolvables can only have a single argument. Multiple arguments can be resolved using tuples
• The type of the resolvable at definition time must match exactly the one at resolution time. E.g. String != String?or (String, Int) != (name: String, age: Int).

Todos

• Add documentation in code
• Add documentation in the Readme

[brototyp]

Hey @benjohnde, is this something interesting for DIKit?