tomasmikula / pascal Goto Github PK

View Code? Open in Web Editor NEW

53.0 53.0 7.0 46 KB

Concise syntax for polymorphic values in Scala.

License: MIT License

Scala 100.00%

pascal's People

Contributors

Stargazers

Watchers

Forkers

barambani bunyod xuwei-k nequissimus philippus scalacommunitybuild sethtisue

pascal's Issues

inner vs outer scope convention

I don't know if this sounds crazy, or if it's even possible, but I find that the biggest amount of boilerplate I see in kind-projector comes from the lambda syntax. e.g.

    def states[S1, S2]: λ[α => State[S1, State[S2, α]]] ~> State[(S1, S2), ?] = ...

I wonder if there could perhaps be an opportunity for further syntax sugar in pascal to have some other symbol, maybe ??, that binds to the most outer type, or a pair of enclosing brackets ( ... ) provided by the user. The above would then be

    def states[S1, S2]: State[S1, State[S2, ??]] ~> State[(S1, S2), ?] = ...

too much magic?

and we could even use it to clarify ambiguous ?, e.g.

    def states[S1, S2]: (State[S1, State[S2, ??]]) ~> (State[(S1, S2), ??]) = ...

Override polymorphic methods

Ideally, given this Functor definition -

trait Functor[F[_]] {
  def map[A, B](f: A => B)(fa: F[A]): F[B]
}

We could create an instance with pascal via -

  implicit val functorOption: Functor[Option] =
    ν[Functor[Option]].map[A, B](f => fa => fa.map(f))

However, this doesn't work. We have to define Functor like this instead -

trait Functor[F[_]] {
  def map[A, B]: (A => B) => F[A] => F[B]
}

Then the instance compiles. Ideally, we should be able to define it as a polymorphic method and the rewrites should be able to handle it accordingly via an override. Maybe this becomes difficult since I believe this all happens before typer, which means we can't easily access the method signature to override. In that case, maybe there's an alternate way to represent such an override?

2.13.1: NoSuchMethodError: scala.tools.nsc.Global.reporter()Lscala/tools/nsc/reporters/Reporter

To reproduce:

git clone https://github.com/cosmin33/exo.git
cd exo
sbt ++2.13.1 compile

Produces exception:

[error] java.lang.NoSuchMethodError: scala.tools.nsc.Global.reporter()Lscala/tools/nsc/reporters/Reporter;
[error] pascal.Rewriter$$anon$1.parse(PascalPlugin.scala:40)
[error] pascal.Rewriter$$anon$1.makeTypeParamFromName(PascalPlugin.scala:60)
[error] pascal.Rewriter$$anon$1.typeArgToTypeParam(PascalPlugin.scala:68)
[error] pascal.Rewriter$$anon$1.$anonfun$typeArgToTypeParam$2(PascalPlugin.scala:75)
[error] scala.collection.immutable.List.map(List.scala:219)
[error] pascal.Rewriter$$anon$1.typeArgToTypeParam(PascalPlugin.scala:75)
[error] pascal.Rewriter$$anon$1.$anonfun$polyVal$1(PascalPlugin.scala:95)
[error] scala.collection.immutable.List.map(List.scala:219)
[error] pascal.Rewriter$$anon$1.polyVal(PascalPlugin.scala:95)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:104)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:25)
[error] scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2583)
[error] scala.reflect.internal.Trees$Apply.transform(Trees.scala:759)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:51)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:104)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:25)
[error] scala.reflect.internal.Trees$ValDef.$anonfun$transform$4(Trees.scala:407)
[error] scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2625)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:37)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:32)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:24)
[error] scala.reflect.internal.Trees$ValDef.transform(Trees.scala:406)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:51)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:104)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:25)
[error] scala.reflect.api.Trees$Transformer.$anonfun$transformStats$1(Trees.scala:2614)
[error] scala.reflect.api.Trees$Transformer.transformStats(Trees.scala:2612)
[error] scala.reflect.internal.Trees$Template.transform(Trees.scala:517)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.$anonfun$transform$1(TypingTransformers.scala:47)
[error] scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2625)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:37)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:32)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:104)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:25)
[error] scala.reflect.api.Trees$Transformer.transformTemplate(Trees.scala:2587)
[error] scala.reflect.internal.Trees$ModuleDef.$anonfun$transform$3(Trees.scala:370)
[error] scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2625)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:37)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:32)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:24)
[error] scala.reflect.internal.Trees$ModuleDef.transform(Trees.scala:369)
[error] scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:51)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:104)
[error] pascal.Rewriter$$anon$1.transform(PascalPlugin.scala:25)
...

The same compilation for scala 2.13.0 works.
this looks the same like the issue kindprojector had: typelevel/kind-projector#116

Recommend Projects

React

A declarative, efficient, and flexible JavaScript library for building user interfaces.
Vue.js

🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
Typescript

TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
TensorFlow

An Open Source Machine Learning Framework for Everyone
Django

The Web framework for perfectionists with deadlines.
Laravel

A PHP framework for web artisans
D3

Bring data to life with SVG, Canvas and HTML. 📊📈🎉

Recommend Topics

javascript

JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
web

Some thing interesting about web. New door for the world.
server

A server is a program made to process requests and deliver data to clients.
Machine learning

Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Visualization

Some thing interesting about visualization, use data art
Game

Some thing interesting about game, make everyone happy.

Recommend Org

Facebook

We are working to build community through open source technology. NB: members must have two-factor auth.
Microsoft

Open source projects and samples from Microsoft.
Google

Google ❤️ Open Source for everyone.
Alibaba

Alibaba Open Source for everyone
D3

Data-Driven Documents codes.
Tencent

China tencent open source team.