1 files changed, 51 insertions, 0 deletions
diff --git a/vendor/chalk-solve-0.87.0/src/display/utils.rs b/vendor/chalk-solve-0.87.0/src/display/utils.rs
new file mode 100644
index 000000000..306605616
--- /dev/null
+++ b/vendor/chalk-solve-0.87.0/src/display/utils.rs
@@ -0,0 +1,51 @@
+//! 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(), "_")
+}