Prepare for merge: Move all minidom-rs files into minidom-rs/

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

minidom-rs/src/convert.rs

@@ -0,0 +1,69 @@
+//! A module which exports a few traits for converting types to elements and attributes.
+
+/// A trait for types which can be converted to an attribute value.
+pub trait IntoAttributeValue {
+    /// Turns this into an attribute string, or None if it shouldn't be added.
+    fn into_attribute_value(self) -> Option<String>;
+}
+
+macro_rules! impl_into_attribute_value {
+    ($t:ty) => {
+        impl IntoAttributeValue for $t {
+            fn into_attribute_value(self) -> Option<String> {
+                Some(format!("{}", self))
+            }
+        }
+    }
+}
+
+macro_rules! impl_into_attribute_values {
+    ($($t:ty),*) => {
+        $(impl_into_attribute_value!($t);)*
+    }
+}
+
+impl_into_attribute_values!(usize, u64, u32, u16, u8, isize, i64, i32, i16, i8, ::std::net::IpAddr);
+
+impl IntoAttributeValue for String {
+    fn into_attribute_value(self) -> Option<String> {
+        Some(self)
+    }
+}
+
+impl<'a> IntoAttributeValue for &'a String {
+    fn into_attribute_value(self) -> Option<String> {
+        Some(self.to_owned())
+    }
+}
+
+impl<'a> IntoAttributeValue for &'a str {
+    fn into_attribute_value(self) -> Option<String> {
+        Some(self.to_owned())
+    }
+}
+
+impl<T: IntoAttributeValue> IntoAttributeValue for Option<T> {
+    fn into_attribute_value(self) -> Option<String> {
+        self.and_then(IntoAttributeValue::into_attribute_value)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::IntoAttributeValue;
+    use std::net::IpAddr;
+    use std::str::FromStr;
+
+    #[test]
+    fn test_into_attribute_value_on_ints() {
+        assert_eq!(16u8.into_attribute_value().unwrap()    , "16");
+        assert_eq!(17u16.into_attribute_value().unwrap()   , "17");
+        assert_eq!(18u32.into_attribute_value().unwrap()   , "18");
+        assert_eq!(19u64.into_attribute_value().unwrap()   , "19");
+        assert_eq!(   16i8.into_attribute_value().unwrap() , "16");
+        assert_eq!((-17i16).into_attribute_value().unwrap(), "-17");
+        assert_eq!(   18i32.into_attribute_value().unwrap(), "18");
+        assert_eq!((-19i64).into_attribute_value().unwrap(), "-19");
+        assert_eq!(IpAddr::from_str("127.000.0.1").unwrap().into_attribute_value().unwrap(), "127.0.0.1");
+    }
+}