Primix (Under Development)

Run command mix init to initialize a primix project.

$ mix init

Initiating Primix for current project

Adding default annotation processors
  -> Using json processor

This command will add Mix and Postmix group into your project and make a new folder in project root path.

Primix uses a simple approach to extract struct or class information before compile time, and generate swift or run commands with ruby script. The code below is a simple usage of primix.

//@json
struct Person {
    let id: Int
    let name: String

    static let JSONKeyPathByPropertyKey: [String: String] = ["name": "nickname.haha"]

    static func nameTransformer(value: Any) -> String? {
        return value as? String
    }
}

//@json is command which marks the struct/class below is needed to be pass into a parser, extract information and send to an annotation processor as instance variable meta.

class Json < Primix::Processor
  self.command = "json"

  def run!
"""extension #{meta.name} {
    static func parse(json: Any) -> #{meta.name}? {
        guard let json = json as? [String: Any] else { return nil }
        guard #{json_extraction_lists.join(",\n\t\t\t")} else { return nil }
        return #{meta.name}(#{key_paths.map { |a| "#{a.name}: #{a.name}" }.join(", ") })
    }
}"""
  end
  ...
end

After running mx install in command line:

$ mx install

Installing primix annotations

Clearing previous postmix files

Requiring all mix ruby scripts
  -> Using `json_mix.rb`

Analyzing annotations
  -> Analyzing `Model/Person.swift`

Json annotation processor would generate swift files according to the class/struct information meta which gives us an automatically generated swift file:

extension Person {
    static func parse(json: Any) -> Person? {
        guard let json = json as? [String: Any] else { return nil }
        guard let id = json["id"] as? Int,
			let name = json["nickname"].flatMap(Person.nameTransformer) else { return nil }
        return Person(id: id, name: name)
    }
}

This swift file is automatically added to current project and target.

Add this line to your application's Gemfile:

gem 'primix'

And then execute:

$ bundle

Or install it yourself as:

$ gem install primix

Bug reports and pull requests are welcome on GitHub at https://github.com/primix/primix. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the Apache 2.0 License