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//! Render utilities which don't belong anywhere else.
use std::fmt::{Display, Formatter, Result};
pub fn as_display<F: Fn(&mut Formatter<'_>) -> Result>(f: F) -> impl Display {
struct ClosureDisplay<F: Fn(&mut Formatter<'_>) -> Result>(F);
impl<F: Fn(&mut Formatter<'_>) -> Result> Display for ClosureDisplay<F> {
fn fmt(&self, f: &mut Formatter<'_>) -> Result {
self.0(f)
}
}
ClosureDisplay(f)
}
macro_rules! write_joined_non_empty_list {
($f:expr,$template:tt,$list:expr,$sep:expr) => {{
let mut x = $list.into_iter().peekable();
if x.peek().is_some() {
write!($f, $template, x.format($sep))
} else {
Ok(())
}
}};
}
/// Processes a name given by an [`Interner`][chalk_ir::interner::Interner] debug
/// method into something usable by the `display` module.
///
/// This is specifically useful when implementing
/// [`RustIrDatabase`][crate::RustIrDatabase] `name_*` methods.
pub fn sanitize_debug_name(func: impl Fn(&mut Formatter<'_>) -> Option<Result>) -> String {
use std::fmt::Write;
// First, write the debug method contents to a String.
let mut debug_out = String::new();
// ignore if the result is `None`, as we can just as easily tell by looking
// to see if anything was written to `debug_out`.
write!(
debug_out,
"{}",
as_display(|fmt| { func(fmt).unwrap_or(Ok(())) })
)
.expect("expected writing to a String to succeed");
if debug_out.is_empty() {
return "Unknown".to_owned();
}
// now the actual sanitization
debug_out.replace(|c: char| !c.is_ascii_alphanumeric(), "_")
}
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