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https://github.com/broomburgo/Narratore
A library to create interactive stories
https://github.com/broomburgo/Narratore
Last synced: about 2 months ago
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A library to create interactive stories
- Host: GitHub
- URL: https://github.com/broomburgo/Narratore
- Owner: broomburgo
- License: mit
- Created: 2022-04-21T12:18:36.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2024-01-01T15:24:34.000Z (9 months ago)
- Last Synced: 2024-07-24T07:43:49.833Z (2 months ago)
- Language: Swift
- Size: 431 KB
- Stars: 45
- Watchers: 2
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-result-builders - Narratore - A library to generate interactive stories and narrative games, that uses a DSL to write the story. (Other)
README
# Narratore
`Narratore` is a Swift library that can be used to create and run interactive stories and narrative games.
With `Narratore` you can create stories using a DSL that allows to focus on the narration, with very few lines of code. In `Narratore` __a story is a Swift Package__.
The library also makes it easy to run a story, with a callback-based handler.
Here's a taste of a minimal definition for a game with `Narratore`:
```swift
import Narratore
// ------ Define a game setting ------ //
enum MyGame: Setting {
enum Generate: Generating {
static func randomRatio() -> Double {
Double((0...1000).randomElement()!)/1000
}
static func uniqueString() -> String {
UUID().uuidString
}
}
struct Message: Messaging {
var id: String?
var text: String
init(id: ID?, text: String) {
self.id = id
self.text = text
}
}
struct Tag: Tagging {
var value: String
init(_ value: String) {
self.value = value
}
}
struct World: Codable {
var isEnjoyable = true
}
}
// ------ Write a story ------ //
extension SceneType {
typealias Game = MyGame
}
extension MyGame: Story {
static let scenes: [RawScene] = [
MyFirstScene.raw,
MySecondScene.Main.raw,
MySecondScene.Other.raw,
]
}
struct MyFirstScene: SceneType {
typealias Anchor = String
var steps: Steps {
"Welcome"
"This is your new game, built with narratore".with(tags: [.init("Let's play some sound effect!")])
check {
if $0.world.isEnjoyable {
"Enjoy!"
}
}
"Now choose".with(anchor: "We could jump right here from anywhere")
choose { _ in
"Go to second scene, main path".onSelect {
"Let's go to the second scene!"
.with(id: "We can keep track of this message")
.then {
.transitionTo(MySecondScene.Main(magicNumber: 42))
}
}
"Go to second scene, alternate path".onSelect {
"Going to the alternate path of the second scene".then {
.transitionTo(MySecondScene.Other())
}
}
}
}
}
enum MySecondScene {
struct Main: SceneType {
var magicNumber: Int
var steps: [SceneStep] {
"Welcome to the second scene"
if magicNumber == 42 {
"The magic number is \(magicNumber)"
} else {
"The magic number doesn't look right..."
}
"Hope you'll find this useful!"
}
}
struct Other: SceneType {
var steps: [SceneStep] {
"I see you chose the alternate path"
"Bad luck!"
}
}
}
// ------ Run the game ------ //
final class MyHandler: Handler {
typealias Game = MyGame
func handle(event: Event) {
if case .gameEnded = event {
print("Thanks for playing!")
}
}
func acknowledge(narration: Narration) async -> Next {
for message in narration.messages {
print(message)
_ = readLine()
}
return .advance
}
func make(choice: Choice) async -> Next> {
for (index, option) in choice.options.enumerated() {
print(index, option.message)
}
while true {
guard
let captured = readLine(),
let selected = Int(captured),
choice.options.indices.contains(selected)
else {
print("Invalid input")
continue
}
return .advance(with: choice.options[selected])
}
}
func answer(request: Player.TextRequest) async -> Next.ValidatedText> {
if let message = request.message {
print(message)
}
guard let text = readLine() else {
return .replay
}
switch request.validate(text) {
case .valid(let validatedText):
return .advance(with: validatedText)
case .invalid(let optionalMessage):
if let optionalMessage {
print(optionalMessage)
}
return .replay
}
}
}
@main
enum Main {
static func main() async {
await Runner.init(
handler: MyHandler.init(),
status: .init(
world: .init(),
scene: MyFirstScene.init()
)
).start()
}
}
```
To learn about the detail of each main component of `Narratore`, check the following docs:
- [Defining a game setting](Docs/DEFINING_A_GAME_SETTING.md)
- [Writing a story](Docs/WRITING_A_STORY.md)
- [Running the game](Docs/RUNNING_THE_GAME.md)
`Narratore` is designed to be modular and extensible. In fact, each main component can be defined and implemented in a separate Swift package. For example:
- a specific game setting could be defined in a library;
- several stories could be created for a certain game setting;
- a game handler for that setting could be created for each platform (command line, iOS, macOS, Linux...);
- the final game would mix the game handler with one or more stories.
To learn how to extend `Narratore` and define modular components, check out [Extending Narratore](Docs/EXTENDING_NARRATORE.md).
The linked docs progressively build a basic game setting, a short story, a simple command-line runner, and some extension, each of which can be found in a companion package called [SimpleGame](https://github.com/broomburgo/SimpleGame), whose purpose is to show the basics of `Narratore` in practice via the construction of an actual story that can be run from the command line.
The main purpose of the companion package is to document the features of `Narratore`; nevertheless, most of its code is generic and reusable, and can be used to create games: please refer to the companion package [README](https://github.com/broomburgo/SimpleGame) to learn how to use it in your projects.
Finally, [DSL reference](Docs/DSL_REFERENCE.md) contains a quick reference to the `Narratore` DSL, that is, the possible commands that one can use to write a story.
Thanks for checking out `Narratore`, I hope you'll have fun with it!
## Requirements
`Narratore` requires `iOS 13` and `macOS 10.15`, and has no third-party dependencies.
## Acknowledgments
`Narratore` was heavily inspired by [Ink](https://www.inklestudios.com/ink/), and its initial purpose was to be a similar story creation engine, but with the possibility of defining stories in Swift, instead of using a markup language. Nevertheless, the Ink specification was a strong inspiration for the features of `Narratore`.