1 files changed, 165 insertions, 0 deletions
diff --git a/third_party/rust/semver/src/display.rs b/third_party/rust/semver/src/display.rs
new file mode 100644
index 0000000000..3c2871bb97
--- /dev/null
+++ b/third_party/rust/semver/src/display.rs
@@ -0,0 +1,165 @@
+use crate::{BuildMetadata, Comparator, Op, Prerelease, Version, VersionReq};
+use core::fmt::{self, Alignment, Debug, Display, Write};
+
+impl Display for Version {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        let do_display = |formatter: &mut fmt::Formatter| -> fmt::Result {
+            write!(formatter, "{}.{}.{}", self.major, self.minor, self.patch)?;
+            if !self.pre.is_empty() {
+                write!(formatter, "-{}", self.pre)?;
+            }
+            if !self.build.is_empty() {
+                write!(formatter, "+{}", self.build)?;
+            }
+            Ok(())
+        };
+
+        let do_len = || -> usize {
+            digits(self.major)
+                + 1
+                + digits(self.minor)
+                + 1
+                + digits(self.patch)
+                + !self.pre.is_empty() as usize
+                + self.pre.len()
+                + !self.build.is_empty() as usize
+                + self.build.len()
+        };
+
+        pad(formatter, do_display, do_len)
+    }
+}
+
+impl Display for VersionReq {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        if self.comparators.is_empty() {
+            return formatter.write_str("*");
+        }
+        for (i, comparator) in self.comparators.iter().enumerate() {
+            if i > 0 {
+                formatter.write_str(", ")?;
+            }
+            write!(formatter, "{}", comparator)?;
+        }
+        Ok(())
+    }
+}
+
+impl Display for Comparator {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        let op = match self.op {
+            Op::Exact => "=",
+            Op::Greater => ">",
+            Op::GreaterEq => ">=",
+            Op::Less => "<",
+            Op::LessEq => "<=",
+            Op::Tilde => "~",
+            Op::Caret => "^",
+            Op::Wildcard => "",
+            #[cfg(no_non_exhaustive)]
+            Op::__NonExhaustive => unreachable!(),
+        };
+        formatter.write_str(op)?;
+        write!(formatter, "{}", self.major)?;
+        if let Some(minor) = &self.minor {
+            write!(formatter, ".{}", minor)?;
+            if let Some(patch) = &self.patch {
+                write!(formatter, ".{}", patch)?;
+                if !self.pre.is_empty() {
+                    write!(formatter, "-{}", self.pre)?;
+                }
+            } else if self.op == Op::Wildcard {
+                formatter.write_str(".*")?;
+            }
+        } else if self.op == Op::Wildcard {
+            formatter.write_str(".*")?;
+        }
+        Ok(())
+    }
+}
+
+impl Display for Prerelease {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str(self.as_str())
+    }
+}
+
+impl Display for BuildMetadata {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str(self.as_str())
+    }
+}
+
+impl Debug for Version {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        let mut debug = formatter.debug_struct("Version");
+        debug
+            .field("major", &self.major)
+            .field("minor", &self.minor)
+            .field("patch", &self.patch);
+        if !self.pre.is_empty() {
+            debug.field("pre", &self.pre);
+        }
+        if !self.build.is_empty() {
+            debug.field("build", &self.build);
+        }
+        debug.finish()
+    }
+}
+
+impl Debug for Prerelease {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "Prerelease(\"{}\")", self)
+    }
+}
+
+impl Debug for BuildMetadata {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "BuildMetadata(\"{}\")", self)
+    }
+}
+
+fn pad(
+    formatter: &mut fmt::Formatter,
+    do_display: impl FnOnce(&mut fmt::Formatter) -> fmt::Result,
+    do_len: impl FnOnce() -> usize,
+) -> fmt::Result {
+    let min_width = match formatter.width() {
+        Some(min_width) => min_width,
+        None => return do_display(formatter),
+    };
+
+    let len = do_len();
+    if len >= min_width {
+        return do_display(formatter);
+    }
+
+    let default_align = Alignment::Left;
+    let align = formatter.align().unwrap_or(default_align);
+    let padding = min_width - len;
+    let (pre_pad, post_pad) = match align {
+        Alignment::Left => (0, padding),
+        Alignment::Right => (padding, 0),
+        Alignment::Center => (padding / 2, (padding + 1) / 2),
+    };
+
+    let fill = formatter.fill();
+    for _ in 0..pre_pad {
+        formatter.write_char(fill)?;
+    }
+
+    do_display(formatter)?;
+
+    for _ in 0..post_pad {
+        formatter.write_char(fill)?;
+    }
+    Ok(())
+}
+
+fn digits(val: u64) -> usize {
+    if val < 10 {
+        1
+    } else {
+        1 + digits(val / 10)
+    }
+}