1// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
 2//
 3// This Source Code Form is subject to the terms of the Mozilla Public
 4// License, v. 2.0. If a copy of the MPL was not distributed with this
 5// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 6
 7use std::convert::TryFrom;
 8
 9use minidom::Element;
10
11use error::Error;
12
13use ns;
14
15#[derive(Debug, Clone)]
16pub struct Replace {
17    pub id: String,
18}
19
20impl<'a> TryFrom<&'a Element> for Replace {
21    type Error = Error;
22
23    fn try_from(elem: &'a Element) -> Result<Replace, Error> {
24        if !elem.is("replace", ns::MESSAGE_CORRECT) {
25            return Err(Error::ParseError("This is not a replace element."));
26        }
27        for _ in elem.children() {
28            return Err(Error::ParseError("Unknown child in replace element."));
29        }
30        let id = match elem.attr("id") {
31            Some(id) => id.to_owned(),
32            None => return Err(Error::ParseError("No 'id' attribute present in replace.")),
33        };
34        Ok(Replace { id: id })
35    }
36}
37
38impl<'a> Into<Element> for &'a Replace {
39    fn into(self) -> Element {
40        Element::builder("replace")
41                .ns(ns::MESSAGE_CORRECT)
42                .attr("id", self.id.clone())
43                .build()
44    }
45}
46
47#[cfg(test)]
48mod tests {
49    use super::*;
50
51    #[test]
52    fn test_simple() {
53        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0' id='coucou'/>".parse().unwrap();
54        Replace::try_from(&elem).unwrap();
55    }
56
57    #[test]
58    fn test_invalid_child() {
59        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'><coucou/></replace>".parse().unwrap();
60        let error = Replace::try_from(&elem).unwrap_err();
61        let message = match error {
62            Error::ParseError(string) => string,
63            _ => panic!(),
64        };
65        assert_eq!(message, "Unknown child in replace element.");
66    }
67
68    #[test]
69    fn test_invalid_id() {
70        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
71        let error = Replace::try_from(&elem).unwrap_err();
72        let message = match error {
73            Error::ParseError(string) => string,
74            _ => panic!(),
75        };
76        assert_eq!(message, "No 'id' attribute present in replace.");
77    }
78
79    #[test]
80    fn test_serialise() {
81        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0' id='coucou'/>".parse().unwrap();
82        let replace = Replace { id: String::from("coucou") };
83        let elem2 = (&replace).into();
84        assert_eq!(elem, elem2);
85    }
86}