Rework reflect SourceFile abstraction

* Change signature to `def sourceCode: Option[String]` in `PositionMethods`
* Change signature to `def content: Option[String]` in `SourceFileMethods`
* Replace `Source.path` with `SourceFile.current: SourceFile` and remove `Source`

Author: nicolasstucki

compiler/src/scala/quoted/runtime/impl/QuotesImpl.scala

@@ -2535,26 +2535,27 @@ class QuotesImpl private (using val ctx: Context) extends Quotes, QuoteUnpickler
         def endLine: Int = self.endLine
         def startColumn: Int = self.startColumn
         def endColumn: Int = self.endColumn
-        def sourceCode: String =
-          new String(self.source.content(), self.start, self.end - self.start)
+        def sourceCode: Option[String] =
+          // TODO detect when we do not have a source and return None
+          Some(new String(self.source.content(), self.start, self.end - self.start))
       end extension
     end PositionMethodsImpl
 
     type SourceFile = dotc.util.SourceFile
 
-    object SourceFile extends SourceFileModule
+    object SourceFile extends SourceFileModule {
+      def current: SourceFile = ctx.compilationUnit.source
+    }
 
     object SourceFileMethodsImpl extends SourceFileMethods:
       extension (self: SourceFile):
         def jpath: java.nio.file.Path = self.file.jpath
-        def content: String = new String(self.content())
+        def content: Option[String] =
+          // TODO detect when we do not have a source and return None
+          Some(new String(self.content()))
       end extension
     end SourceFileMethodsImpl
 
-    object Source extends SourceModule:
-      def path: java.nio.file.Path = ctx.compilationUnit.source.file.jpath
-    end Source
-
     object report extends reportModule:
 
       def error(msg: String): Unit =

library/src/scala/quoted/Quotes.scala

@@ -4104,7 +4104,7 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
         def endColumn: Int
 
         /** Source code within the position */
-        def sourceCode: String
+        def sourceCode: Option[String]
 
       end extension
     }
@@ -4116,7 +4116,10 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
     val SourceFile: SourceFileModule
 
     /** Methods of the module object `val SourceFile` */
-    trait SourceFileModule { this: SourceFile.type => }
+    trait SourceFileModule { this: SourceFile.type =>
+      /** Returns the source file being compiled. The path is relative to the current working directory. */
+      def current: SourceFile
+    }
 
     /** Makes extension methods on `SourceFile` available without any imports */
     given SourceFileMethods: SourceFileMethods = SourceFileMethodsImpl
@@ -4131,25 +4134,10 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
         def jpath: java.nio.file.Path
 
         /** Content of this source file */
-        def content: String
+        def content: Option[String]
       end extension
     }
 
-    ///////////////
-    //   Source  //
-    ///////////////
-
-    /** Module object of `type Source`  */
-    val Source: SourceModule
-
-    /** Methods of the module object `val Source` */
-    trait SourceModule { this: Source.type =>
-
-      /** Returns the source file being compiled. The path is relative to the current working directory. */
-      def path: java.nio.file.Path
-
-    }
-
     ///////////////
     // REPORTING //
     ///////////////

tests/run-macros/reflect-sourceCode/Macro_1.scala

@@ -6,6 +6,6 @@ object api {
 
   private def reflImpl[T](x: Expr[T])(implicit qctx: Quotes): Expr[String] = {
     import quotes.reflect._
-    Expr(Term.of(x).pos.sourceCode)
+    Expr(Term.of(x).pos.sourceCode.get)
   }
 }

tests/run-macros/tasty-getfile-implicit-by-name-fun-context/Macro_1.scala

@@ -8,6 +8,7 @@ object SourceFiles {
     ${getThisFileImpl}
 
   def getThisFileImpl: Macro[String] =
-    Expr(quotes.reflect.Source.path.getFileName.toString)
+    val q = quotes // Quotes is ByName and hence not stable (q stabilizes it)
+    Expr(q.reflect.SourceFile.current.jpath.getFileName.toString)
 
 }

tests/run-macros/tasty-getfile-implicit-fun-context/Macro_1.scala

@@ -10,7 +10,7 @@ object SourceFiles {
 
   def getThisFileImpl: Macro[String] = {
     val qctx = tastyContext
-    Expr(qctx.reflect.Source.path.getFileName.toString)
+    Expr(qctx.reflect.SourceFile.current.jpath.getFileName.toString)
   }
 
 }

tests/run-macros/tasty-getfile/Macro_1.scala

@@ -7,6 +7,6 @@ object SourceFiles {
     ${getThisFileImpl}
 
   private def getThisFileImpl(using Quotes) : Expr[String] =
-    Expr(quotes.reflect.Source.path.getFileName.toString)
+    Expr(quotes.reflect.SourceFile.current.jpath.getFileName.toString)
 
 }

tests/run-macros/tasty-original-source/Macros_1.scala

@@ -6,7 +6,7 @@ object Macros {
 
   private def impl(arg: Expr[Any])(using Quotes) : Expr[(String, Any)] = {
     import quotes.reflect._
-    val source = Expr(Term.of(arg).underlyingArgument.pos.sourceCode.toString)
+    val source = Expr(Term.of(arg).underlyingArgument.pos.sourceCode.get.toString)
     '{Tuple2($source, $arg)}
   }