Scala macro modify object

Question

I have a next macro annotation

 class Foo(obj: String) extends StaticAnnotation {
    def macroTransform(annottees: Any*) = macro MacroImpl.impl
 }

 object MacroImpl {
    def impl(c: Context)(annottees: c.Expr[Any]*): c.Expr[Any] = {
      import c.universe._

      // i want find `obj` and modify body
    } 

 }

 // usage
 @Foo("pkg.myObject") class SomeClass {}

Is it possible with macro find object by name and modify body of object?

Eugene Burmako · Accepted Answer · 2015-08-03 07:46:41Z

2

This is currently impossible, because macros in Scala can't modify anything outside their scope. E.g. def macros can only rewrite their applications, not the code around, and macro annotations can only rewrite their annottees, not the code around.

answered Aug 3, 2015 at 7:46

Eugene Burmako

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