forwarding: Switch to Into/TryFrom.

src/forwarding.rs

@@ -22,52 +22,56 @@ pub struct Forwarded {
     pub stanza: Option<message::Message>,
 }
 
-pub fn parse_forwarded(root: &Element) -> Result<Forwarded, Error> {
-    if !root.is("forwarded", ns::FORWARD) {
-        return Err(Error::ParseError("This is not a forwarded element."));
-    }
-    let mut delay = None;
-    let mut stanza = None;
-    for child in root.children() {
-        if child.is("delay", ns::DELAY) {
-            delay = Some(Delay::try_from(child)?);
-        } else if child.is("message", ns::JABBER_CLIENT) {
-            stanza = Some(message::parse_message(child)?);
-        // TODO: also handle the five other possibilities.
-        } else {
-            return Err(Error::ParseError("Unknown child in forwarded element."));
+impl<'a> TryFrom<&'a Element> for Forwarded {
+    type Error = Error;
+
+    fn try_from(elem: &'a Element) -> Result<Forwarded, Error> {
+        if !elem.is("forwarded", ns::FORWARD) {
+            return Err(Error::ParseError("This is not a forwarded element."));
         }
+        let mut delay = None;
+        let mut stanza = None;
+        for child in elem.children() {
+            if child.is("delay", ns::DELAY) {
+                delay = Some(Delay::try_from(child)?);
+            } else if child.is("message", ns::JABBER_CLIENT) {
+                stanza = Some(message::parse_message(child)?);
+            // TODO: also handle the five other possibilities.
+            } else {
+                return Err(Error::ParseError("Unknown child in forwarded element."));
+            }
+        }
+        Ok(Forwarded {
+            delay: delay,
+            stanza: stanza,
+        })
     }
-    Ok(Forwarded {
-        delay: delay,
-        stanza: stanza,
-    })
 }
 
-pub fn serialise(forwarded: &Forwarded) -> Element {
-    Element::builder("forwarded")
-            .ns(ns::FORWARD)
-            .append(match forwarded.delay { Some(ref delay) => { let elem: Element = delay.into(); Some(elem) }, None => None })
-            .append(forwarded.stanza.clone())
-            .build()
+impl<'a> Into<Element> for &'a Forwarded {
+    fn into(self) -> Element {
+        Element::builder("forwarded")
+                .ns(ns::FORWARD)
+                .append(match self.delay { Some(ref delay) => { let elem: Element = delay.into(); Some(elem) }, None => None })
+                .append(self.stanza.clone())
+                .build()
+    }
 }
 
 #[cfg(test)]
 mod tests {
-    use minidom::Element;
-    use error::Error;
-    use forwarding;
+    use super::*;
 
     #[test]
     fn test_simple() {
         let elem: Element = "<forwarded xmlns='urn:xmpp:forward:0'/>".parse().unwrap();
-        forwarding::parse_forwarded(&elem).unwrap();
+        Forwarded::try_from(&elem).unwrap();
     }
 
     #[test]
     fn test_invalid_child() {
         let elem: Element = "<forwarded xmlns='urn:xmpp:forward:0'><coucou/></forwarded>".parse().unwrap();
-        let error = forwarding::parse_forwarded(&elem).unwrap_err();
+        let error = Forwarded::try_from(&elem).unwrap_err();
         let message = match error {
             Error::ParseError(string) => string,
             _ => panic!(),
@@ -78,8 +82,8 @@ mod tests {
     #[test]
     fn test_serialise() {
         let elem: Element = "<forwarded xmlns='urn:xmpp:forward:0'/>".parse().unwrap();
-        let forwarded = forwarding::Forwarded { delay: None, stanza: None };
-        let elem2 = forwarding::serialise(&forwarded);
+        let forwarded = Forwarded { delay: None, stanza: None };
+        let elem2 = (&forwarded).into();
         assert_eq!(elem, elem2);
     }
 }

src/mam.rs

@@ -13,7 +13,6 @@ use error::Error;
 
 use data_forms::DataForm;
 use rsm::Set;
-use forwarding;
 use forwarding::Forwarded;
 
 use ns;
@@ -86,7 +85,7 @@ pub fn parse_result(root: &Element) -> Result<Result_, Error> {
     let mut forwarded = None;
     for child in root.children() {
         if child.is("forwarded", ns::FORWARD) {
-            forwarded = Some(forwarding::parse_forwarded(child)?);
+            forwarded = Some(Forwarded::try_from(child)?);
         } else {
             return Err(Error::ParseError("Unknown child in result element."));
         }
@@ -190,7 +189,7 @@ pub fn serialise_result(result: &Result_) -> Element {
                            .attr("queryid", result.queryid.clone())
                            .attr("id", result.id.clone())
                            .build();
-    elem.append_child(forwarding::serialise(&result.forwarded));
+    elem.append_child((&result.forwarded).into());
     elem
 }