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Replace java reflection with a macro based solution
Necessary for cross compilation with scala native, since it does not offer any reflection functionalities. Instead of the previous method, we create a mapping between strings (pointed out by the dialectOverride in scalafmt.conf) and methods that allow us to replace dialect values.
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35 changes: 35 additions & 0 deletions
35
scalafmt-macros/shared/src/main/scala/org/scalafmt/config/DialectMacro.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| package org.scalafmt.config | ||
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| import scala.meta.Dialect | ||
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| import scala.language.experimental.macros | ||
| import scala.reflect.macros.blackbox | ||
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| // Builds a map between string (the scalafmt method name) | ||
| // and dialect method application | ||
| private[scalafmt] object DialectMacro { | ||
| def dialectMap: Map[String, ((Dialect, Any) => Dialect)] = | ||
| macro dialectMap_impl | ||
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| def dialectMap_impl( | ||
| c: blackbox.Context, | ||
| ): c.Expr[Map[String, ((Dialect, Any) => Dialect)]] = { | ||
| import c.universe._ | ||
| val methods = typeOf[Dialect].members.flatMap { | ||
| case v: MethodSymbol => v.paramLists match { | ||
| case (param :: Nil) :: Nil => // single parameter | ||
| val methodName = v.name | ||
| val methodNameStr = methodName.toString | ||
| if (methodNameStr.startsWith("with")) { | ||
| val tpe = param.typeSignature | ||
| Some(q"$methodNameStr -> ((dialect: scala.meta.Dialect, v: Any) => dialect.$methodName(v.asInstanceOf[$tpe]))") | ||
| } else None | ||
| case _ => None | ||
| } | ||
| case _ => None | ||
| } | ||
| c.Expr[Map[String, ((Dialect, Any) => Dialect)]]( | ||
| q"""scala.collection.immutable.Map(..$methods)""", | ||
| ) | ||
| } | ||
| } |
80 changes: 80 additions & 0 deletions
80
scalafmt-tests/src/test/scala/org/scalafmt/config/ConfigDialectOverrideTest.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| package org.scalafmt.config | ||
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| import scala.meta.Dialect | ||
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| import munit.FunSuite | ||
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| class ConfigDialectOverrideTest extends FunSuite { | ||
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| // toplevelSeparator is never actually used, | ||
| // but as the only non-boolean Dialect value it makes for a good test | ||
| test("dialect override - non boolean setting") { | ||
| ScalafmtConfig.fromHoconString( | ||
| """| | ||
| |runner.dialectOverride.toplevelSeparator = ">" | ||
| |runner.dialect = scala213 | ||
| |""".stripMargin, | ||
| ).get | ||
| } | ||
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| test("throws on an incorrect type of setting") { | ||
| intercept[java.util.NoSuchElementException] { | ||
| ScalafmtConfig.fromHoconString( | ||
| """| | ||
| |runner.dialectOverride.toplevelSeparator = true | ||
| |runner.dialect = scala213 | ||
| |""".stripMargin, | ||
| ).get | ||
| } | ||
| } | ||
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| def testBooleanFlag(methodName: String, getter: Dialect => Boolean): Unit = { | ||
| def makeBooleanConfig(setting: String, value: Boolean) = ScalafmtConfig | ||
| .fromHoconString( | ||
| s"""| | ||
| |runner.dialectOverride.$setting = $value | ||
| |runner.dialect = scala213 | ||
| |""".stripMargin, | ||
| ).get | ||
| Seq(true, false).foreach { flag => | ||
| test(s"boolean flag: $methodName($flag)") { | ||
| assertEquals( | ||
| getter(makeBooleanConfig(methodName, flag).runner.getDialect), | ||
| flag, | ||
| ) | ||
| } | ||
| } | ||
| } | ||
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| testBooleanFlag("allowFewerBraces", _.allowFewerBraces) | ||
| testBooleanFlag("withAllowFewerBraces", _.allowFewerBraces) | ||
| testBooleanFlag("useInfixTypePrecedence", _.useInfixTypePrecedence) | ||
| testBooleanFlag("withUseInfixTypePrecedence", _.useInfixTypePrecedence) | ||
| testBooleanFlag( | ||
| "allowImplicitByNameParameters", | ||
| _.allowImplicitByNameParameters, | ||
| ) | ||
| testBooleanFlag( | ||
| "withAllowImplicitByNameParameters", | ||
| _.allowImplicitByNameParameters, | ||
| ) | ||
| testBooleanFlag("allowSignificantIndentation", _.allowSignificantIndentation) | ||
| testBooleanFlag( | ||
| "withAllowSignificantIndentation", | ||
| _.allowSignificantIndentation, | ||
| ) | ||
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| test("applying generated boolean map elements does not result in errors") { | ||
| val omittedMethods = Set( | ||
| "withToplevelSeparator", // non-boolean | ||
| "withAllowMultilinePrograms", // unimplemented in scalameta (???) | ||
| "withAllowTermUnquotes", // unimplemented in scalameta (???) | ||
| "withAllowPatUnquotes", // unimplemented in scalameta (???) | ||
| ) | ||
| val generatedMap = DialectMacro.dialectMap | ||
| val baseDialect = scala.meta.dialects.Scala213 | ||
| generatedMap.keys.filter(!omittedMethods.contains(_)).foreach { key => | ||
| generatedMap(key)(baseDialect, true) | ||
| } | ||
| } | ||
| } |