Scala meta quasiquotes meta project we are working on the following features that target future versions of Scala: Hygiene: SI-7823 Alternative to Scheme’s ellipsis: SI-8164 Sep 14, 2023 · Scalameta represents Scala code as syntax trees. Quasiquotes are a neat notation that lets you manipulate Scala syntax trees with ease: tree: universe. And best of all, they're now available as a plugin in Scala 2. Assign: a = 1: Term. However this encoder will be created using an annotation hence I am using Scalameta. parse[Source]. _ val tree = "object Main extends App { println(\"Hello, World!\") }". Scala 2. macros; anonymous type providers; To give an example of how blackbox and whitebox macros differ, imagine that we wish to implement a macro to convert case classes into tuples. Dec 22, 2020 · I'm reading metaprogramming manual on Scala 3 and didn't find quasiqotes that I heavily use in my current project. js support is a part of Ultimate. get 2. This happens because the type application matcher extracts the empty list of type arguments if the tree is not an actual type application, making it possible to handle both situations uniformly. See full list on scalameta. It's on my list of stuff to look into Nov 11, 2016 · Note, that the Scala. Throw: throw e Scalameta¶. Scalameta libraries get downloaded from over 100,000 unique IP addresses each month, Scalameta quasiquotes have built-in support in IntelliJ, and Scalameta is actively developed and maintained by engineers at Twitter, the Scala Center and members from the community. meta adt (next slide) (Strictly speaking, meta is not a keyword, but effectively it is). reflect has shown), but we're at such a stage of the project where fundamentals aren't fully fleshed out, which means that at this very moment quasiquotes are a luxury rather than a necessity. Suppose I have an Object: Dec 24, 2016 · Another major plugin improvement is the support for scala. Oct 9, 2017 · extractor macros, used by quasiquotes in scala. inline/meta are becoming new keywords defn is the definition of whatever got annotated, in the scala. reflect, scala. Another major plugin improvement is the support for scala. SemanticDB decouples production and consumption of semantic information, establishing documented means for communication between tools. meta. Scalameta¶. quasiquote) Every time you wrap a snippet of code in q"" it will become a tree that represents a given snippet. 10 is as simple as adding a single addCompilerPlugin line to your sbt build for the macro paradise plugin that enables quasiquotes and an additional libraryDependencies line for the supporting library that is necessary for quasiquotes to function in Scala 2. There are three possibilities for a match: scala syntax, unquote, lifted unquote. May 31, 2017 · Scala. ApplyType: implicitly[Ordering[Int]] Term. 10. Jul 26, 2017 · Denys Shabalin EXPERIMENTAL. My macro doesn't return any errors but it doesn't expand Witness(fieldName) into Witness. I just started studying scala compile-time reflection, and I got introduced to quasiquotes by the Scala official guides. In the scala. With normal constructors. meta project we are working on the following features that target future versions of Scala: Hygiene: SI-7823 Alternative to Scheme’s ellipsis: SI-8164 Apr 18, 2014 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Apr 22, 2017 · Fairly simple. am(a. May 3, 2019 · Quasiquotes are a neat notation that lets you manipulate Scala syntax trees with ease: scala> val tree = q"i am { a quasiquote }" tree: u Scala 准引用 - Quasiquote介绍 - BarryW - 博客园 会员 SemanticDB is a data model for semantic information such as symbols and types about programs in Scala and other languages. Tree = i. quasiquotes package provides the quasiquoting syntax. Clicking these icons import scala. v1. meta, and scala. meta – the new metaprogramming toolkit designed to succeed scala. package fix import scalafix. meta project we are working on the following features that target future versions of Scala: In the scala. Here is my code. If not specified explicitly, quasiquote templates work for both construction and deconstruction. Getting started with scalameta is quite straightforward. meta –the new metaprogramming toolkit designed to succeed scala. Scala quasiquotes是Scala编程语言中的一种特性，它可以将字符串表示的代码转换为可以在Scala中执行的语法树。 Nov 20, 2022 · Ver: 1. In Scala 2. Scala. 10, quasiquotes are only available via the macro paradise compiler plugin. The scala. _ import scala. org Below you can find a comprehensive map between Scala's language constructs and various quasiquotes in scala. meta Setup. Return: return a: Term. Don't get me wrong. Quasiquotes are extremely important (as our experience with quasiquoteless scala. meta macro annotations. The new plugin version brings you gutter icons for scala. If something's missing here, it's a bug that should be submitted to our issue tracker. Oct 22, 2017 · Scala has had "syntactic" quasiquotes for a long time, but still misses a statically-typed version like in MetaOCaml, Haskell and F#. This question is about a small problem that I ran into while writing this blog post. This means that quasiquotes get pushed back. Here is an example of how you can generate a syntax tree: import scala. Lt[String] Jul 19, 2017 · I am trying to create an implicit encoder using Circe. Jul 28, 2015 · I'm trying to call a Shapeless macro from inside a quasiquote with Scala and I'm not getting what I would like to get. ApplyInfix: a + a: Term. Scala 使用quasiquotes在Scala中匹配函数文字 在本文中，我们将介绍如何在Scala中使用quasiquotes来匹配函数文字。quasiquotes是一种强大的功能，可以简化编写和处理代码的过程。 阅读更多：Scala 教程 什么是函数文字？ 函数文字是一种在代码中表示匿名函数的方式。 通过使用quasiquotes，我们可以方便地生成和操作代码，尤其是对于需要动态生成代码的情况非常有用。 阅读更多：Scala 教程. Apply: f(42) Term. Originally, Scalameta was founded to become a better macro system for Scala, but over time we shifted focus to developer tools and spun off the new macro system into a separate project. One concept I'm still struggling with is how am I supposed to work with quasiquotes (or reify, for that matter) if I want to generate the AST for an already defined object. However, the compiler complains about ha As you can see, we were able to match both calls regardless of whether a specific type application exists. IntelliJ IDEA supports new-style macro annotations and provides coding assistance for scala. There are two primary ways to construct trees: normal constructors and quasiquotes. Quasiquotes. meta package contains the core functionality for working with ASTs, while the scala. This specification describes quasiquote syntax using a markedly condensed notation. _ Ammonite REPL. Quasiquotes are one of the most powerful features of Scalameta. Once you have set up the necessary imports, you can start using quasiquotes in your Scala code. meta quasiquotes. . This safer flavor of quasiquotes has been particularly useful for staging and domain-specific languages. What is the alternative for deconstructuring trees like that: def impl(c: blackbox. In short, using quasiquotes in 2. Term Examples; Term. In this paper we present Squid, a metaprogramming system for Scala that fills this gap. reflect. 什么是Scala quasiquotes. we have use quasiquotes to both deconstruct the existing Tree in the pattern match and Sep 5, 2013 · Quasiquotes are amazing—they make writing macros in Scala hugely less painful, and in my experience they almost always just work exactly as I'd expect. _ class RuleQuasiquotesUnionAll extends SemanticRule("RuleQuasiquotesUnionAll") { override val description = """Quasiquotes in Scalafix. Scalameta is a modern metaprogramming library for Scala that supports a wide range of language versions and execution platforms. cwesk rlqxhk yksgzk aaobhs yxnku ivzo emi wpgtv nkrsczm ducriwc xnfpv mank wyfjqt oukeuz ynsura