Rust Composition and Inheritance comparison in Language Server Protocol Text Modules Architectures Context https://www.youtube.com/watch?v=X_weppAAQBs

LSPRustTestModuleRelationShipsDoc.rs

/*
let htlm = HtmlRichText(path="index.html")
html.load
let mutableRichText = MutableRichText(richText)
mutableRichText.append("Hello, ")
mutableRichTextInheritance

RichText
└── MutableRichText
└── FileRichText
    └── HtmlRichText
    └── MarkdownRichText

Composition
RichText + HtmlRichText + MutableRichText

Inheritance
class Implementation: Parent() {...}

Composition
class Class:
  Behaviour1,
  Behavior2,
  Behavior3,
{...}
*/
/* Inheritance */
class MutableRichText: RichText() {
  let rightTextTree = RichTextTree()
  let currentStyle = SpanStyle()
  
  fn append(text: String) {
    let node = RichTextNode(currentStyle, text)
    richTextTree.addNode(node)
  }
}

abstract class RichText {
  abstract let richTextTree: RichTextTree
  
  fn getText(): String {
    return richTextTree.getText()
  }

  fn getNodes(): List<RichTextNode> {
    return richTextTree.getNodes() 
  }
    
  abstract fn save {}
  abstract fn load {}
}
    
class HtmlRichText(
  path: String,
): RichText() {
  override let: RichTextTree = RichTextTree()
  
  override fn save() {
    let html = getHtmlFromRichTextFile(richTextTree)
    
    val file = File(path)
    file.write(html)
  }
  
  override fn load() {
    val file = File(path)
    val htmlText = file.read()
    
    richTextTree = getRichTextTreeFromHtml(htmlText)
  }
}
    
class MarkdownRichText(
    private val path: String
): RichText() {
  override var richTextTree = RichTextTree()
    private set
  
  override fn save() {
    val markdown = getMarkdownFromRichTextTree(richTextTree)
    val file = File(path)
    file.write(markdown)
  }
  
  override fn load() {
    val file = File(path)
    val markdown = file.read()
    
    richTextTree = getRichTextTreeFromMarkdown(markdown)
  }
    
}

fn main() {
   val richText = RichText()
    
   val html = HtmlRichText(path = "index.html")
   html.load(richText)
    

   val mutableRichText = MutableRichText(richText)
    mutableRichTe3xt.appen("Hello, ")
    mutableRichText.changeStyle(SpanStyle(color = Color.red))
    mutableRichText.append("World!")
 
    html.save(richText)
}