Impl Parse::parse for Date

libimagtimeui/src/date.rs

@@ -26,8 +26,68 @@ impl Into<ChronoNaiveDate> for Date {
 
 impl Parse for Date {
 
+    /// Parse the date part of the full string into a Date object
     fn parse(s: &str) -> Option<Date> {
-        unimplemented!()
+        use std::str::FromStr;
+        use regex::Regex;
+        use parse::time_parse_regex;
+
+        lazy_static! {
+            static ref R: Regex = Regex::new(time_parse_regex()).unwrap();
+        }
+
+        R.captures(s)
+            .and_then(|capts| {
+                let year  = capts.name("Y").and_then(|o| FromStr::from_str(o).ok());
+                let month = capts.name("M").and_then(|o| FromStr::from_str(o).ok());
+                let day   = capts.name("D").and_then(|o| FromStr::from_str(o).ok());
+
+                if year.is_none() {
+                    debug!("No year");
+                    return None;
+                }
+                if month.is_none() {
+                    debug!("No month");
+                    return None;
+                }
+                if day.is_none() {
+                    debug!("No day");
+                    return None;
+                }
+
+                Some(Date::new(year.unwrap(), month.unwrap(), day.unwrap()))
+            })
+
+    }
+
+}
+
+#[cfg(test)]
+mod test {
+    use super::Date;
+    use parse::Parse;
+
+    #[test]
+    fn test_valid() {
+        let s = "2016-02-01";
+        let d = Date::parse(s);
+
+        assert!(d.is_some());
+        let d = d.unwrap();
+
+        assert_eq!(2016, d.year());
+        assert_eq!(2, d.month());
+        assert_eq!(1, d.day());
+    }
+
+    #[test]
+    fn test_invalid() {
+        assert!(Date::parse("2016-021-01").is_none());
+        assert!(Date::parse("2016-02-012").is_none());
+        assert!(Date::parse("2016-02-0").is_none());
+        assert!(Date::parse("2016-0-02").is_none());
+        assert!(Date::parse("2016-02").is_none());
+        assert!(Date::parse("2016-2").is_none());
     }
 
 }