Move s.u.FromString to s.u.CommandLineParser.FromString.

library/src/scala/util/CommandLineParser.scala

@@ -41,4 +41,49 @@ object CommandLineParser {
       else s" after ${err.idx} arguments"
     println(s"Illegal command line$where: ${err.msg}")
   }
+
+  trait FromString[T] {
+    /** Can throw java.lang.IllegalArgumentException */
+    def fromString(s: String): T
+
+    def fromStringOption(s: String): Option[T] =
+      try Some(fromString(s))
+      catch {
+        case ex: IllegalArgumentException => None
+      }
+  }
+
+  object FromString {
+    given FromString[String] {
+      def fromString(s: String) = s
+    }
+
+    given FromString[Boolean] {
+      def fromString(s: String) = s.toBoolean
+    }
+
+    given FromString[Byte] {
+      def fromString(s: String) = s.toByte
+    }
+
+    given FromString[Short] {
+      def fromString(s: String) = s.toShort
+    }
+
+    given FromString[Int] {
+      def fromString(s: String) = s.toInt
+    }
+
+    given FromString[Long] {
+      def fromString(s: String) = s.toLong
+    }
+
+    given FromString[Float] {
+      def fromString(s: String) = s.toFloat
+    }
+
+    given FromString[Double] {
+      def fromString(s: String) = s.toDouble
+    }
+  }
 }

tests/neg/main-functions2.scala

@@ -8,6 +8,6 @@ class Foo {
 
 @main def g(x: Int*)(y: Int*) = () // error: varargs parameter of @main method must come last
 
-@main def h[T: util.FromString](x: T) = () // error: @main method cannot have type parameters
+@main def h[T: util.CommandLineParser.FromString](x: T) = () // error: @main method cannot have type parameters
 
 @main def i(x: Int)(using Foo) = () // error: @main method cannot have implicit parameters

tests/pos/main-method-scheme-class-based.scala

@@ -13,7 +13,7 @@ import collection.mutable
  */
 trait MainAnnotation extends StaticAnnotation:
 
-  /** The class used for argument string parsing. E.g. `scala.util.FromString`,
+  /** The class used for argument string parsing. E.g. `scala.util.CommandLineParser.FromString`,
    *  but could be something else
    */
   type ArgumentParser[T]
@@ -44,7 +44,7 @@ end MainAnnotation
 
 class main extends MainAnnotation:
 
-  type ArgumentParser[T] = util.FromString[T]
+  type ArgumentParser[T] = util.CommandLineParser.FromString[T]
   type MainResultType = Any
 
   def command(args: Array[String]): Command = new Command:
@@ -202,4 +202,4 @@ Error: invalid argument for num: binary
 Error: unused argument: 01
 Usage: add num inc?
 
-*/
+*/

tests/pos/main-method-scheme.scala

@@ -22,7 +22,7 @@ class main(progName: String, args: Array[String], docComment: String) extends Ma
 
   def this() = this("", Array(), "")
 
-  type ArgumentParser[T] = util.FromString[T]
+  type ArgumentParser[T] = util.CommandLineParser.FromString[T]
 
   /** A buffer of demanded argument names, plus
    *   "?"  if it has a default
@@ -167,4 +167,4 @@ Error: unknown argument name: --foo
 Usage: add num inc?
 Adds two numbers
 
-*/
+*/

tests/run/decorators/main.scala

@@ -5,7 +5,7 @@ import collection.mutable
  */
 class main extends EntryPoint.Annotation:
 
-  type ArgumentParser[T] = util.FromString[T]
+  type ArgumentParser[T] = util.CommandLineParser.FromString[T]
   type EntryPointResult  = Unit
 
   inline def wrapperName(entryPointName: String): String =

tests/semanticdb/expect/toplevel.expect.scala

@@ -3,4 +3,4 @@ extension (x/*<-_empty_::toplevel$package.extension_combine().(x)*/: Int/*->scal
 def combine/*<-_empty_::toplevel$package.combine().*/(x/*<-_empty_::toplevel$package.combine().(x)*/: Int/*->scala::Int#*/, y/*<-_empty_::toplevel$package.combine().(y)*/: Int/*->scala::Int#*/, z/*<-_empty_::toplevel$package.combine().(z)*/: Int/*->scala::Int#*/) = x/*->_empty_::toplevel$package.combine().(x)*/ +/*->scala::Int#`+`(+4).*/ y/*->_empty_::toplevel$package.combine().(y)*/ +/*->scala::Int#`+`(+4).*/ z/*->_empty_::toplevel$package.combine().(z)*/
 def combine/*<-_empty_::toplevel$package.combine(+1).*/ = 0
 def foo/*<-_empty_::toplevel$package.foo().*/ = "foo"
-/*<-_empty_::MyProgram#*//*->_empty_::toplevel$package.MyProgram().*//*->scala::util::CommandLineParser.parseArgument().*//*->_empty_::MyProgram#main().(args)*//*->scala::util::FromString.given_FromString_Int.*//*->scala::util::CommandLineParser.showError().*//*->local0*/@main/*->scala::main#*/ def MyProgram/*<-_empty_::toplevel$package.MyProgram().*/(times/*<-_empty_::toplevel$package.MyProgram().(times)*/: Int/*->scala::Int#*/): Unit/*->scala::Unit#*/ = (/*->scala::LowPriorityImplicits#intWrapper().*/1 to/*->scala::runtime::RichInt#to().*/ times/*->_empty_::toplevel$package.MyProgram().(times)*/) foreach/*->scala::collection::immutable::Range#foreach().*/ (_ => println/*->scala::Predef.println(+1).*/("hello"))
+/*<-_empty_::MyProgram#*//*->_empty_::toplevel$package.MyProgram().*//*->scala::util::CommandLineParser.parseArgument().*//*->_empty_::MyProgram#main().(args)*//*->scala::util::CommandLineParser.FromString.given_FromString_Int.*//*->scala::util::CommandLineParser.showError().*//*->local0*/@main/*->scala::main#*/ def MyProgram/*<-_empty_::toplevel$package.MyProgram().*/(times/*<-_empty_::toplevel$package.MyProgram().(times)*/: Int/*->scala::Int#*/): Unit/*->scala::Unit#*/ = (/*->scala::LowPriorityImplicits#intWrapper().*/1 to/*->scala::runtime::RichInt#to().*/ times/*->_empty_::toplevel$package.MyProgram().(times)*/) foreach/*->scala::collection::immutable::Range#foreach().*/ (_ => println/*->scala::Predef.println(+1).*/("hello"))

tests/semanticdb/metac.expect

@@ -3973,7 +3973,7 @@ Occurrences:
 [5:0..5:0): -> _empty_/toplevel$package.MyProgram().
 [5:0..5:0): -> scala/util/CommandLineParser.parseArgument().
 [5:0..5:0): -> _empty_/MyProgram#main().(args)
-[5:0..5:0): -> scala/util/FromString.given_FromString_Int.
+[5:0..5:0): -> scala/util/CommandLineParser.FromString.given_FromString_Int.
 [5:0..5:0): -> scala/util/CommandLineParser.showError().
 [5:0..5:0): -> local0
 [5:1..5:5): main -> scala/main#