Interpolated string extension methods

[Guevara-chan]

Consider following sample:

import System.Runtime.CompilerServices
[Extension] def cap(text as string):
    print Char.ToUpper(text[0]) + text[1:].ToLower()
name = "tester"
"hello, $name !".cap()

Do you expect it to work ? Me too. However, compiler disagree:

BCE0043: Unexpected token: \<EOL>. BCE0043: Unexpected token: .

What could be done ? Is it bug or somewhat intended restriction ?

[masonwheeler]

This should work. You're seeing a parser error, which happens well before any interpretation of string interpolations, and one that doesn't reproduce on my end, so I'm not quite sure what's going on with your code.

[Guevara-chan]

Cool. That being said, enclosing interpolated string with brackets works for some reason: ("hello, $name !").cap() # No error here.

[masonwheeler]

Right. If it's a simple reference expression, no parens or brackets are needed. They're only needed if you're enclosing more than one identifier, like $(name.ToUpper), so the parser knows how much is interpolation and how much is the literal part of the string.

[Guevara-chan]

Um, cool... I guess. So, this was intended behavior ?

[masonwheeler]

Yeah. Did you ever figure out what was going on with the parse error?