Remove the -rs suffix of jid, minidom and xmpp

We know those are Rust libraries, no need to add it to the path.  This
synchronises their directory with the crate name, hopefully reducing
confusion.

minidom/src/prefixes.rs

@@ -0,0 +1,101 @@
+// Copyright (c) 2020 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+// Copyright (c) 2020 Astro <astro@spaceboyz.net>
+// Copyright (c) 2020 Maxime “pep” Buquet <pep@bouah.net>
+// Copyright (c) 2020 Xidorn Quan <me@upsuper.org>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+use std::collections::BTreeMap;
+use std::fmt;
+
+pub type Prefix = Option<String>;
+pub type Namespace = String;
+
+#[derive(Clone, PartialEq, Eq)]
+pub struct Prefixes {
+    prefixes: BTreeMap<Prefix, Namespace>,
+}
+
+impl Default for Prefixes {
+    fn default() -> Self {
+        Prefixes {
+            prefixes: BTreeMap::new(),
+        }
+    }
+}
+
+impl fmt::Debug for Prefixes {
+    // TODO: Fix end character
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Prefixes(")?;
+        for (prefix, namespace) in &self.prefixes {
+            write!(
+                f,
+                "xmlns{}={:?} ",
+                match prefix {
+                    None => String::new(),
+                    Some(prefix) => format!(":{}", prefix),
+                },
+                namespace
+            )?;
+        }
+        write!(f, ")")
+    }
+}
+
+impl Prefixes {
+    pub fn declared_prefixes(&self) -> &BTreeMap<Prefix, Namespace> {
+        &self.prefixes
+    }
+
+    pub fn get(&self, prefix: &Prefix) -> Option<&Namespace> {
+        self.prefixes.get(prefix)
+    }
+
+    pub(crate) fn insert<S: Into<Namespace>>(&mut self, prefix: Prefix, namespace: S) {
+        self.prefixes.insert(prefix, namespace.into());
+    }
+}
+
+impl From<BTreeMap<Prefix, Namespace>> for Prefixes {
+    fn from(prefixes: BTreeMap<Prefix, Namespace>) -> Self {
+        Prefixes { prefixes }
+    }
+}
+
+impl From<Option<String>> for Prefixes {
+    fn from(namespace: Option<String>) -> Self {
+        match namespace {
+            None => Self::default(),
+            Some(namespace) => Self::from(namespace),
+        }
+    }
+}
+
+impl From<Namespace> for Prefixes {
+    fn from(namespace: Namespace) -> Self {
+        let mut prefixes = BTreeMap::new();
+        prefixes.insert(None, namespace);
+
+        Prefixes { prefixes }
+    }
+}
+
+impl From<(Prefix, Namespace)> for Prefixes {
+    fn from(prefix_namespace: (Prefix, Namespace)) -> Self {
+        let (prefix, namespace) = prefix_namespace;
+        let mut prefixes = BTreeMap::new();
+        prefixes.insert(prefix, namespace);
+
+        Prefixes { prefixes }
+    }
+}
+
+impl From<(String, String)> for Prefixes {
+    fn from(prefix_namespace: (String, String)) -> Self {
+        let (prefix, namespace) = prefix_namespace;
+        Self::from((Some(prefix), namespace))
+    }
+}