1 files changed, 87 insertions, 0 deletions
diff --git a/vendor/number_prefix/src/parse.rs b/vendor/number_prefix/src/parse.rs
new file mode 100644
index 0000000..cfb37af
--- /dev/null
+++ b/vendor/number_prefix/src/parse.rs
@@ -0,0 +1,87 @@
+use std::{error::Error, fmt, str};
+
+use super::{NumberPrefix, Prefix};
+
+
+impl<T: str::FromStr> str::FromStr for NumberPrefix<T> {
+    type Err = NumberPrefixParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let splitted = s.find(|p| {
+            p == 'k' || p == 'K' || p == 'M' || p == 'G' || p == 'T' ||
+            p == 'P' || p == 'E' || p == 'Z' || p == 'Y'
+        });
+
+        let num_prefix = s.split_at(splitted.unwrap_or(s.len()));
+        let num = match num_prefix.0.trim().parse::<T>() {
+            Ok(n)  => n,
+            Err(_) => return Err(NumberPrefixParseError(())),
+        };
+
+        let prefix_unit = num_prefix.1.trim_matches(|p|
+                p == 'b' || p == 'B' || p == 'm'
+            );
+
+        let prefix = match prefix_unit {
+            "k"  |
+            "K"  => Prefix::Kilo,
+            "M"  => Prefix::Mega,
+            "G"  => Prefix::Giga,
+            "T"  => Prefix::Tera,
+            "P"  => Prefix::Peta,
+            "E"  => Prefix::Exa,
+            "Z"  => Prefix::Zetta,
+            "Y"  => Prefix::Yotta,
+            "Ki" => Prefix::Kibi,
+            "Mi" => Prefix::Mebi,
+            "Gi" => Prefix::Gibi,
+            "Ti" => Prefix::Tebi,
+            "Pi" => Prefix::Pebi,
+            "Ei" => Prefix::Exbi,
+            "Zi" => Prefix::Zebi,
+            "Yi" => Prefix::Yobi,
+            ""   => return Ok(NumberPrefix::Standalone(num)),
+            _    => return Err(NumberPrefixParseError(())),
+        };
+
+        Ok(NumberPrefix::Prefixed(prefix, num))
+    }
+}
+
+
+/// The error returned when a `NumberPrefix` is failed to be parsed.
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub struct NumberPrefixParseError(());
+
+impl fmt::Display for NumberPrefixParseError {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.write_str("invalid prefix syntax")
+    }
+}
+
+impl Error for NumberPrefixParseError {
+}
+
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn parse_examples() {
+        let parse_example_a = "7.05E".parse::<NumberPrefix<f64>>();
+        let parse_example_b = "7.05".parse::<NumberPrefix<f64>>();
+        let parse_example_c = "7.05 GiB".parse::<NumberPrefix<f64>>();
+
+        assert_eq!(parse_example_a, Ok(NumberPrefix::Prefixed(Prefix::Exa, 7.05_f64)));
+        assert_eq!(parse_example_b, Ok(NumberPrefix::Standalone(7.05_f64)));
+        assert_eq!(parse_example_c, Ok(NumberPrefix::Prefixed(Prefix::Gibi, 7.05_f64)));
+    }
+
+    #[test]
+    fn bad_parse() {
+        let parsed = "bogo meters per second".parse::<NumberPrefix<f64>>();
+
+        assert_ne!(parsed, Ok(NumberPrefix::Prefixed(Prefix::Kilo, 7.05_f64)));
+    }
+}