Migrate the core module and tests to scala 3

.github/workflows/ci-scala3.yml

@@ -0,0 +1,55 @@
+# This file was based on ci.yml file, but is unmanaged by the sbt plugin
+# and was edited manually. Should be removed when sangria-derivation will
+# be merged for Scala 3
+
+name: Continuous Integration (Scala 3)
+
+on:
+  pull_request:
+    branches: ['**']
+  push:
+    branches: ['**']
+    tags: [v*]
+
+jobs:
+  build:
+    name: Build and Test on Scala 3
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        scala: [3.1.3]
+        java: [temurin@11]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout current branch (full)
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Setup Java (temurin@11)
+        if: matrix.java == 'temurin@11'
+        uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - name: Cache sbt
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.sbt
+            ~/.ivy2/cache
+            ~/.coursier/cache/v1
+            ~/.cache/coursier/v1
+            ~/AppData/Local/Coursier/Cache/v1
+            ~/Library/Caches/Coursier/v1
+          key: ${{ runner.os }}-sbt-cache-v2-${{ hashFiles('**/*.sbt') }}-${{ hashFiles('project/build.properties') }}
+
+      - name: Check binary compatibility
+        run: sbt ++${{ matrix.scala }} "sangria-ast/mimaReportBinaryIssues;sangria-parser/mimaReportBinaryIssues;sangria-core/mimaReportBinaryIssues"
+
+      - name: Check formatting
+        run: sbt ++${{ matrix.scala }} scalafmtCheckAll
+
+      - name: Build and test project
+        run: sbt ++${{ matrix.scala }} "sangria-parser/test;sangria-core/test"

.scalafmt.conf

@@ -2,6 +2,12 @@ version = 3.5.8
 
 runner.dialect = scala213
 
+fileOverride {
+  "glob:**/src/main/scala-3/**" {
+    runner.dialect = scala3
+  }
+}
+
 maxColumn = 100
 
 // Vertical alignment is pretty, but leads to bigger diffs

build.sbt

@@ -3,14 +3,21 @@ import sbt.Keys._
 
 import com.typesafe.tools.mima.core._
 
+val isScala3 = Def.setting(
+  CrossVersion.partialVersion(scalaVersion.value).exists(_._1 == 3)
+)
+
 // sbt-github-actions needs configuration in `ThisBuild`
-ThisBuild / crossScalaVersions := Seq("2.12.16", "2.13.8")
-ThisBuild / scalaVersion := crossScalaVersions.value.last
+ThisBuild / crossScalaVersions := Seq("2.12.16", "2.13.8", "3.1.3")
+ThisBuild / scalaVersion := "2.13.8"
 ThisBuild / githubWorkflowBuildPreamble ++= List(
   WorkflowStep.Sbt(List("mimaReportBinaryIssues"), name = Some("Check binary compatibility")),
   WorkflowStep.Sbt(List("scalafmtCheckAll"), name = Some("Check formatting"))
 )
 
+// For now we set up GH Actions manually for Scala 3
+ThisBuild / githubWorkflowScalaVersions := crossScalaVersions.value.filterNot(_.startsWith("3."))
+
 // Release
 ThisBuild / githubWorkflowTargetTags ++= Seq("v*")
 ThisBuild / githubWorkflowPublishTargetBranches :=
@@ -28,6 +35,10 @@ ThisBuild / githubWorkflowPublish := Seq(
   )
 )
 
+def emptyForScala3(isScala3: Boolean, module: ModuleID): Set[ModuleID] =
+  if (isScala3) Set.empty
+  else Set(module)
+
 lazy val root = project
   .in(file("."))
   .withId("sangria-root")
@@ -45,7 +56,9 @@ lazy val ast = project
   .settings(
     name := "sangria-ast",
     description := "Scala GraphQL AST representation",
-    mimaPreviousArtifacts := Set("org.sangria-graphql" %% "sangria-ast" % "3.0.0"),
+    mimaPreviousArtifacts := emptyForScala3(
+      isScala3.value,
+      "org.sangria-graphql" %% "sangria-ast" % "3.0.0"),
     mimaBinaryIssueFilters ++= Seq(
       ProblemFilters.exclude[IncompatibleResultTypeProblem]("sangria.ast.DirectiveDefinition.*"),
       ProblemFilters.exclude[DirectMissingMethodProblem]("sangria.ast.DirectiveDefinition.apply"),
@@ -67,7 +80,9 @@ lazy val parser = project
   .settings(
     name := "sangria-parser",
     description := "Scala GraphQL parser",
-    mimaPreviousArtifacts := Set("org.sangria-graphql" %% "sangria-parser" % "3.0.0"),
+    mimaPreviousArtifacts := emptyForScala3(
+      isScala3.value,
+      "org.sangria-graphql" %% "sangria-parser" % "3.0.0"),
     libraryDependencies ++= Seq(
       // AST Parser
       "org.parboiled" %% "parboiled" % "2.4.0",
@@ -87,7 +102,9 @@ lazy val core = project
   .settings(
     name := "sangria-core",
     description := "Scala GraphQL implementation",
-    mimaPreviousArtifacts := Set("org.sangria-graphql" %% "sangria-core" % "3.0.0"),
+    mimaPreviousArtifacts := emptyForScala3(
+      isScala3.value,
+      "org.sangria-graphql" %% "sangria-core" % "3.0.0"),
     mimaBinaryIssueFilters ++= Seq(
       ProblemFilters.exclude[DirectMissingMethodProblem](
         "sangria.introspection.IntrospectionDirective.apply"),
@@ -109,18 +126,17 @@ lazy val core = project
         "sangria.schema.Directive.copy$default$*"),
       ProblemFilters.exclude[DirectMissingMethodProblem]("sangria.schema.Directive.apply"),
       ProblemFilters.exclude[DirectMissingMethodProblem]("sangria.schema.Directive.this"),
-      ProblemFilters.exclude[MissingTypesProblem]("sangria.schema.Directive$")
+      ProblemFilters.exclude[MissingTypesProblem]("sangria.schema.Directive$"),
+      ProblemFilters.exclude[MissingTypesProblem]("sangria.schema.MappedAbstractType")
     ),
     Test / testOptions += Tests.Argument(TestFrameworks.ScalaTest, "-oF"),
     libraryDependencies ++= Seq(
       // AST Visitor
-      "org.sangria-graphql" %% "macro-visit" % "0.1.3",
+      "org.sangria-graphql" %% "macro-visit" % "0.2.0-RC1",
       // Marshalling
       "org.sangria-graphql" %% "sangria-marshalling-api" % "1.0.8",
       // Streaming
       "org.sangria-graphql" %% "sangria-streaming-api" % "1.0.3",
-      // Macros
-      "org.scala-lang" % "scala-reflect" % scalaVersion.value,
       // Testing
       "co.fs2" %% "fs2-core" % "2.5.11" % Test,
       "org.scalatest" %% "scalatest" % "3.2.13" % Test,
@@ -131,9 +147,11 @@ lazy val core = project
       "org.sangria-graphql" %% "sangria-monix" % "2.0.1" % Test,
       "eu.timepit" %% "refined" % "0.10.1" % Test,
       // CATs
-      "net.jcazevedo" %% "moultingyaml" % "0.4.2" % Test,
+      ("net.jcazevedo" %% "moultingyaml" % "0.4.2" % Test).cross(CrossVersion.for3Use2_13),
       "io.github.classgraph" % "classgraph" % "4.8.149" % Test
-    ),
+    ) ++ (if (isScala3.value) Seq.empty
+          else Seq("org.scala-lang" % "scala-reflect" % scalaVersion.value)), // Macros
+
     apiURL := {
       val ver = CrossVersion.binaryScalaVersion(scalaVersion.value)
       Some(url(s"https://www.javadoc.io/doc/org.sangria-graphql/sangria-core_$ver/latest/"))
@@ -148,11 +166,12 @@ lazy val derivation = project
   .settings(
     name := "sangria-derivation",
     Test / testOptions += Tests.Argument(TestFrameworks.ScalaTest, "-oF"),
-    mimaPreviousArtifacts := Set("org.sangria-graphql" %% "sangria-derivation" % "3.0.0"),
-    libraryDependencies ++= Seq(
-      // Macros
-      "org.scala-lang" % "scala-reflect" % scalaVersion.value
-    ),
+    mimaPreviousArtifacts := emptyForScala3(
+      isScala3.value,
+      "org.sangria-graphql" %% "sangria-derivation" % "3.0.0"),
+    // Macros
+    libraryDependencies ++= (if (isScala3.value) Seq.empty
+                             else Seq("org.scala-lang" % "scala-reflect" % scalaVersion.value)),
     apiURL := {
       val ver = CrossVersion.binaryScalaVersion(scalaVersion.value)
       Some(url(s"https://www.javadoc.io/doc/org.sangria-graphql/sangria-derivation_$ver/latest/"))
@@ -210,11 +229,12 @@ lazy val projectInfo = Seq(
 )
 
 lazy val scalacSettings = Seq(
-  scalacOptions ++= Seq("-deprecation", "-feature", "-Xlint:-missing-interpolator,_"),
+  scalacOptions ++= Seq("-deprecation", "-feature"),
+  scalacOptions ++= { if (!isScala3.value) Seq("-Xlint:-missing-interpolator,_") else Seq.empty },
   scalacOptions ++= {
     if (scalaVersion.value.startsWith("2.12")) Seq("-language:higherKinds") else List.empty[String]
   },
-  scalacOptions += "-target:jvm-1.8",
+  scalacOptions += { if (isScala3.value) "-Xtarget:8" else "-target:jvm-1.8" },
   autoAPIMappings := true,
   Compile / doc / scalacOptions ++= // scaladoc options
     Opts.doc.title("Sangria") ++ Seq(

modules/core/src/main/scala-3/sangria/macros/ParseMacro.scala

@@ -0,0 +1,36 @@
+package sangria.macros
+
+import scala.quoted._
+import sangria.parser.{QueryParser, SyntaxError}
+
+object ParseMacro extends ToExprGivens {
+  def impl(using Quotes)(strCtxExpr: Expr[StringContext]): Expr[sangria.ast.Document] =
+    val parts = strCtxExpr.valueOrAbort.parts
+    if parts.length > 1 then
+      throw new Exception(
+        "String interpolation is not supported for `graphql`/`gql` macro at the moment.")
+    parts.headOption match
+      case Some(str) =>
+        Expr(QueryParser.parse(str).get)
+      case None => throw new Exception("Invalid `graphql` invocation syntax.")
+
+  def implInput(using Quotes)(strCtxExpr: Expr[StringContext]): Expr[sangria.ast.Value] =
+    val parts = strCtxExpr.valueOrAbort.parts
+    if parts.length > 1 then
+      throw new Exception(
+        "String interpolation is not supported for `graphqlInput`/`gqlInp` macro at the moment.")
+    parts.headOption match
+      case Some(str) =>
+        Expr(QueryParser.parseInput(str).get)
+      case None => throw new Exception("Invalid `graphql` invocation syntax.")
+
+  def implInputDoc(using Quotes)(strCtxExpr: Expr[StringContext]): Expr[sangria.ast.InputDocument] =
+    val parts = strCtxExpr.valueOrAbort.parts
+    if parts.length > 1 then
+      throw new Exception(
+        "String interpolation is not supported for `gqlInpDoc` macro at the moment.")
+    parts.headOption match
+      case Some(str) =>
+        Expr(QueryParser.parseInputDocument(str).get)
+      case None => throw new Exception("Invalid `graphql` invocation syntax.")
+}