transducer-machines | 易学教程

Using Scalaz Stream for parsing task (replacing Scalaz Iteratees)

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问题 Introduction I use Scalaz 7's iteratees in a number of projects, primarily for processing large-ish files. I'd like to start switching to Scalaz streams, which are designed to replace the iteratee package (which frankly is missing a lot of pieces and is kind of a pain to use). Streams are based on machines (another variation on the iteratee idea), which have also been implemented in Haskell. I've used the Haskell machines library a bit, but the relationship between machines and streams isn't

Using Scalaz Stream for parsing task (replacing Scalaz Iteratees)

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What's the conceptual difference between Machines and Conduits (or other similar libraries)?

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问题 I'd like to learn the concept, so that I'd be able to understand and use libraries such as machines. I tried to follow Rúnar Bjarnason's talk on machines, but there is too little information, basically just a bunch of data types. I can't even understand what k is in newtype Machine k o = Step k o (Machine k o) data Step k o r = Stop | Yield o r | forall t . Await (t -> r) (k t) r or what's t is and why it's quantified. Or, what's the conceptual difference between conduit -like libraries and

What's the conceptual difference between Machines and Conduits (or other similar libraries)?

阅读更多关于 What's the conceptual difference between Machines and Conduits (or other similar libraries)?

I'd like to learn the concept, so that I'd be able to understand and use libraries such as machines . I tried to follow Rúnar Bjarnason's talk on machines , but there is too little information, basically just a bunch of data types. I can't even understand what k is in newtype Machine k o = Step k o (Machine k o) data Step k o r = Stop | Yield o r | forall t . Await (t -> r) (k t) r or what's t is and why it's quantified. Or, what's the conceptual difference between conduit -like libraries and machines ? conduit and pipes are both far more mature than machines , but -- that said -- machines is