Building DSLs in Swift
So let’s take things one step further, and enable our above code to be used as a proper DSL. The first thing we’ll need is an execution context. One reason that DSLs can remove so much verbosity and cruft, is that they’re used in a very specific context, that itself already provides much of the information required to understand what the code does.
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For our context, we’ll take some inspiration from the
UIView.animateAPI, and use a closure to encapsulate the usage of our DSL. All we need to make that happen is a simple extension onUIViewthat adds a method that in turn calls our context closure.[…]
Let’s see how we can improve our DSL using operators - starting with overloading the plus and minus operators to enable us to combine a layout anchor and a constant into a tuple - which’ll later let us act on them as one unit[…]
