Procedural Generation: Passages + JavaScript

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There are many different ways to approach procedural generation of content in Twine. This example covers using //passages// as storage and JavaScript functions as a method of generating content. <blockquote> This example uses the SugarCube 2.21.0 story format. It also heavily based on the work of Tony Veale from the following paper: Veale, T. (2016). A Rap on the Knuckles and a Twist in the Tale: From Tweeting Affective Metaphors to Generating Stories with a Moral. In Proceedings of the AAAI Spring Symposium on Ethical and Moral Considerations in Non-Human Agents. Additional information can be found on the GitHub page: <a href="https://github.com/prosecconetwork/Scealextric">Scealextric</a> </blockquote> [[Using Story.get()]]

In SugarCube, the //Story.get()// function is used to get a Passage object representing the passage by name. Passage objects have properties like //text// and //title// to get their contents. <<set $storyContent to Story.get("A and B Story")>> <<set $passageText to $storyContent.text>> $passageText [[Using Passage.text]]

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The //text// property of Passage object is a string. Using the //split()// function, a string can be broken into an array containing the contents of the string "split" according to some other string. <<set $contents to Story.get("Before Actions")>> <<set $passageText to $contents.text>> <<set $splitContents to $passageText.split("\n")>> Using the third entry in the array: A $splitContents[3] B Using the 125th entry of the array: A $splitContents[125] B [[Random array entries]]

This is a story about A and B.

To get a random entry within an array, use the length of the array as a maximum when using the //random()// function in SugarCube. <<set $contents to Story.get("Before Actions")>> <<set $passageText to $contents.text>> <<set $splitContents to $passageText.split("\n")>> <<set $randomNumber to random(0, $splitContents.length)>> <<set $randomEntry to $splitContents[$randomNumber]>> Using a random entry: A $randomEntry B [[Using the Include macro]]

The include macro is used to "call" or "include" the contents of one passage in another. In Twine, it is a common way to create modular content. <<include "Before Action Generation">> Before action: A $randomBeforeAction B <<include "After Action Generation">> After action: B $randomAfterAction A <<include "Closure Point Generation">> Closure Point: A $randomClosurePoint B

<<set $contents to Story.get("Before Actions")>> <<set $passageText to $contents.text>> <<set $splitContents to $passageText.split("\n")>> <<set $randomNumber to random(0, $splitContents.length)>> <<set $randomBeforeAction to $splitContents[$randomNumber]>>

<<set $contents to Story.get("After Actions")>> <<set $passageText to $contents.text>> <<set $splitContents to $passageText.split("\n")>> <<set $randomNumber to random(0, $splitContents.length)>> <<set $randomAfterAction to $splitContents[$randomNumber]>>

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<<set $contents to Story.get("Closure Points")>> <<set $passageText to $contents.text>> <<set $splitContents to $passageText.split("\n")>> <<set $randomNumber to random(0, $splitContents.length)>> <<set $randomClosurePoint to $splitContents[$randomNumber]>>