Advanced TypeScript Programming Projects

Applying the visitor pattern to our code

Now that we know what the visitor pattern is, let's take a look at how we are going to apply it to our code:

1. First, we are going to create the IVisitor and IVisitable interfaces as follows:

interface IVisitor {    Visit(token : ParseElement, markdownDocument : IMarkdownDocument) : void;}interface IVisitable {    Accept(visitor : IVisitor, token : ParseElement, markdownDocument : IMarkdownDocument) : void;}

2. When our code reaches the point where Visit is called, we are going to use the TagTypeToHtml class to add the relevant opening HTML tag, the line of text, and then the matching closing HTML tag to our MarkdownDocument. As this is common to each of our tag types, we can implement a base class that encapsulates ...