Add key-value-splitter helper

libimagutil/src/key_value_split.rs

@@ -0,0 +1,53 @@
+use regex::Regex;
+
+pub fn split_into_key_value(s: String) -> Option<(String, String)> {
+    let r = "^(?P<KEY>(.*))=((\"(?P<DOUBLE_QVAL>(.*))\")|(\'(?P<SINGLE_QVAL>(.*)))\'|(?P<VAL>[^\'\"](.*)[^\'\"]))$";
+    let regex = Regex::new(r).unwrap();
+    regex.captures(&s[..]).and_then(|cap| {
+        cap.name("KEY")
+            .map(|name| {
+                cap.name("SINGLE_QVAL")
+                    .or(cap.name("DOUBLE_QVAL"))
+                    .or(cap.name("VAL"))
+                    .map(|value| (String::from(name), String::from(value)))
+            }).unwrap_or(None)
+    })
+}
+
+#[cfg(test)]
+mod test {
+    use super::split_into_key_value;
+
+    #[test]
+    fn test_single_quoted() {
+        let s = String::from("foo='bar'");
+        assert_eq!(Some((String::from("foo"), String::from("bar"))), split_into_key_value(s));
+    }
+
+    #[test]
+    fn test_double_quoted() {
+        let s = String::from("foo=\"bar\"");
+        assert_eq!(Some((String::from("foo"), String::from("bar"))), split_into_key_value(s));
+    }
+
+    #[test]
+    fn test_double_and_single_quoted() {
+        let s = String::from("foo=\"bar\'");
+        assert!(split_into_key_value(s).is_none());
+    }
+
+    #[test]
+    fn test_single_and_double_quoted() {
+        let s = String::from("foo=\'bar\"");
+        assert!(split_into_key_value(s).is_none());
+    }
+
+    #[test]
+    fn test_not_quoted() {
+        let s = String::from("foo=bar");
+        assert_eq!(Some((String::from("foo"), String::from("bar"))), split_into_key_value(s));
+    }
+
+}
+
+

libimagutil/src/lib.rs

@@ -1,3 +1,4 @@
 extern crate regex;
 
+pub mod key_value_split;
 pub mod variants;