https://github.com/devongovett/fontkit/blob/master/src/opentype/shapers/DefaultShaper.js <https://github.com/devongovett/fontkit/blob/master/src/opentype/shapers/DefaultShaper.js> https://github.com/devongovett/fontkit/blob/master/src/opentype/shapers/UniversalShaper.js <https://github.com/devongovett/fontkit/blob/master/src/opentype/shapers/UniversalShaper.js> https://github.com/devongovett/fontkit/blob/master/src/opentype/shapers/ArabicShaper.js <https://github.com/devongovett/fontkit/blob/master/src/opentype/shapers/ArabicShaper.js>
UniversalShaper and ArabicShaper extend DefaultShaper. All methods are static and the classes are never instantiated. The static “plan” method in the base class calls the static methods in the subclasses using “this”. I would not have guessed something like this would be possible, but Devon Govett makes very extensive use of ES6 features. I’ve learned quite a bit about ES6 just by reading his code… ;-) Harbs > On Apr 23, 2018, at 8:25 PM, Alex Harui <aha...@adobe.com> wrote: > > Harbs, > > Can you provide a link to more info on how 'this' works in statics? MDN > makes it sound like it points to the global object even in ES6. > > I saw an article that code duplication isn't a perfect emulation of ES6 > statics in ES5. > https://www.bennadel.com/blog/3300-static-methods-are-inherited-when-using-es6-extends-syntax-in-javascript-and-node-js.htm > > On 4/22/18, 11:46 PM, "Harbs" <harbs.li...@gmail.com> wrote: > > It seems like ES6 supports static inheritance. The means you can define a > class with static methods which can be called in subclasses. You can also use > “this” in static methods which will refer to the subclass methods if > overridden. This is obviously something which doesn’t work in AS3. > > I’m porting an ES6 library to AS3 and I’m trying to figure out the best > way to port this kind of code. I’m thinking that code duplication is probably > simplest, although I might just convert the static classes into singletons. > > Harbs >
