Add an attention parser.

src/attention.rs

@@ -0,0 +1,44 @@
+use minidom::Element;
+
+use error::Error;
+
+use ns;
+
+#[derive(Debug, Clone)]
+pub enum Attention {
+    Attention,
+}
+
+pub fn parse_attention(root: &Element) -> Result<Attention, Error> {
+    if !root.is("attention", ns::ATTENTION) {
+        return Err(Error::ParseError("This is not an attention element."));
+    }
+    for _ in root.children() {
+        return Err(Error::ParseError("Unknown child in attention element."));
+    }
+    Ok(Attention::Attention)
+}
+
+#[cfg(test)]
+mod tests {
+    use minidom::Element;
+    use error::Error;
+    use attention;
+
+    #[test]
+    fn test_simple() {
+        let elem: Element = "<attention xmlns='urn:xmpp:attention:0'/>".parse().unwrap();
+        attention::parse_attention(&elem).unwrap();
+    }
+
+    #[test]
+    fn test_invalid_child() {
+        let elem: Element = "<attention xmlns='urn:xmpp:attention:0'><coucou/></attention>".parse().unwrap();
+        let error = attention::parse_attention(&elem).unwrap_err();
+        let message = match error {
+            Error::ParseError(string) => string,
+            _ => panic!(),
+        };
+        assert_eq!(message, "Unknown child in attention element.");
+    }
+}