Function text_string_at

src/repr/src/explain/text.rs:274–288

Apply `f: F` to create a rendering context of type `C` and render the given tree `t: T` within that context. # Panics Panics if the [`DisplayText::fmt_text`] call returns a [`fmt::Error`].

(t: &'a T, f: F)

///
/// Panics if the [`DisplayText::fmt_text`] call returns a [`fmt::Error`].
pub fn text_string_at<'a, T: DisplayText<C>, C, F: Fn() -> C>(t: &'a T, f: F) -> String {
    struct TextStringAt<'a, T, C, F: Fn() -> C> {
        t: &'a T,
        f: F,
    }

    impl<T: DisplayText<C>, C, F: Fn() -> C> DisplayText<()> for TextStringAt<'_, T, C, F> {
        fn fmt_text(&self, f: &mut fmt::Formatter<'_>, _ctx: &mut ()) -> fmt::Result {
            let mut ctx = (self.f)();
            self.t.fmt_text(f, &mut ctx)
        }
    }

    text_string(&TextStringAt { t, f })
}