Add a Last Message Correction parser.

src/message_correct.rs

@@ -0,0 +1,45 @@
+use minidom::Element;
+
+use error::Error;
+
+use ns;
+
+#[derive(Debug, Clone)]
+pub enum MessageCorrect {
+    Replace(String),
+}
+
+pub fn parse_message_correct(root: &Element) -> Result<MessageCorrect, Error> {
+    if !root.is("replace", ns::MESSAGE_CORRECT) {
+        return Err(Error::ParseError("This is not a replace element."));
+    }
+    for _ in root.children() {
+        return Err(Error::ParseError("Unknown child in replace element."));
+    }
+    let id = root.attr("id").unwrap_or("").to_owned();
+    Ok(MessageCorrect::Replace(id))
+}
+
+#[cfg(test)]
+mod tests {
+    use minidom::Element;
+    use error::Error;
+    use message_correct;
+
+    #[test]
+    fn test_simple() {
+        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
+        message_correct::parse_message_correct(&elem).unwrap();
+    }
+
+    #[test]
+    fn test_invalid_child() {
+        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'><coucou/></replace>".parse().unwrap();
+        let error = message_correct::parse_message_correct(&elem).unwrap_err();
+        let message = match error {
+            Error::ParseError(string) => string,
+            _ => panic!(),
+        };
+        assert_eq!(message, "Unknown child in replace element.");
+    }
+}