question: @ Nullable public static List < PsiElement > searchForWrappingMethod ( PsiElement start , boolean deep ) { PsiElement seeker = start ; List < PsiElement > ret = new ArrayList < PsiElement > ( 2 ) ; while ( seeker != null ) { PyFunction func = PsiTreeUtil . getParentOfType ( seeker , PyFunction . class , true , PyClass . class ) ; if ( func != null ) { PyClass cls = func . getContainingClass ( ) ; if ( cls != null ) { ret . add ( func ) ; ret . add ( cls ) ; return ret ; } else if ( deep ) { ret . add ( func ) ; seeker = func ; } else { return null ; } } else { return null ; } } return null ; }
target:  Searhes for a method wrapping given element.