It seemed like it could match pretty darned closely.įor processing expressions, I think it’s been a complete win for me. I had already known about, and enjoyed using, enumerations with associated types. I am trying to recreate this Java Code in Swift related to Multiple. That really pushed me to consider that kind of thing for what in Java were structural classes. Java code to swift converter Java to Swift code conversion Fatal Error: Not enough bits to represent the passed value RSA encryption/decryption implementing in Swift from Android Java code Web service request in swift corresponding to java code Swift Multiple Inheritance. I have to admit, the section in The Swift Programming Language on enumerations had an interior section on Recursive Enumerations that used arithmetic expressions as an example. This may not have been the wisest choice, but I went for hand-coding these classes, and while I was in there I tried using Enumerations. The author used a bit of code to generate the classes from a basic grammar (and then re-uses it as the grammar evolves within the book while we’re implementing things). There are a number of “representation” classes that make up the tree structure that you build while parsing and interpreting. I approached this one with the initial thought of “I’ve no idea if this’ll work”. I think the end result is far easier to understand and read, which is huge for me – as this is not something I’ve tried before and I find a lot of the elements difficult to understand to start with. It makes it extremely easy to define an interface that you’d otherwise wrap into a visitor pattern (using a protocol), and use an extension to conform classes to the protocol. A clear translation win is leveraging Swift’s protocols and extensions to accommodate the same kind of setup. The author tackles some of the awkwardness of that by aggressively using a visitor pattern over Java classes. Replacing the Visitor Pattern with Protocols and ExtensionsĪ lot of the example code takes advantage of classes and uses a fair number recursive calls. I thought I’d write about what’s worked, and where I think I might have painted myself into a corner. This is not something I’m very familiar with, so I’m trying a couple different ways of tackling the development. While going through it, I’m making a stab at translating the example code in the book (which is in Java) into Swift. I’m working through the online book Crafting Interpreters, (which I highly recommend, if you’re curious about how such things are built).
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