Implement conversion functinos for RoomIdOrAliasId

CHANGELOG.md

@@ -1,5 +1,19 @@
 # [unreleased]
 
+Breaking changes:
+
+* Update `RoomId::parse_with_server_name`s bounds from `Into<Cow<'_, str>>` to
+  `AsRef<str> + Into<String>`. While this is a breaking change, it is not expected to actually
+  require code changes.
+
+Improvements:
+
+* Add conversion functions for `RoomIdOrAliasId`
+  * `impl From<RoomId> for RoomIdOrAliasId`
+  * `impl From<RoomAliasId> for RoomIdOrAliasId`
+  * `impl TryFrom<RoomIdOrAliasId> for RoomId`
+  * `impl TryFrom<RoomIdOrAliasId> for RoomAliasId`
+
 # 0.15.1
 
 Bug fixes:

src/room_alias_id.rs

@@ -24,8 +24,8 @@ use crate::{error::Error, parse_id};
 #[cfg_attr(feature = "diesel", derive(FromSqlRow, QueryId, AsExpression, SqlType))]
 #[cfg_attr(feature = "diesel", sql_type = "Text")]
 pub struct RoomAliasId {
-    full_id: String,
+    pub(crate) full_id: String,
-    colon_idx: NonZeroU8,
+    pub(crate) colon_idx: NonZeroU8,
 }
 
 impl RoomAliasId {

src/room_id.rs

@@ -24,8 +24,8 @@ use crate::{error::Error, parse_id};
 #[cfg_attr(feature = "diesel", derive(FromSqlRow, QueryId, AsExpression, SqlType))]
 #[cfg_attr(feature = "diesel", sql_type = "Text")]
 pub struct RoomId {
-    full_id: String,
+    pub(crate) full_id: String,
-    colon_idx: NonZeroU8,
+    pub(crate) colon_idx: NonZeroU8,
 }
 
 impl RoomId {

src/room_id_or_room_alias_id.rs

@@ -5,7 +5,7 @@ use std::{borrow::Cow, convert::TryFrom, hint::unreachable_unchecked, num::NonZe
 #[cfg(feature = "diesel")]
 use diesel::sql_types::Text;
 
-use crate::{error::Error, parse_id};
+use crate::{error::Error, parse_id, RoomAliasId, RoomId};
 
 /// A Matrix room ID or a Matrix room alias ID.
 ///
@@ -89,6 +89,52 @@ impl TryFrom<Cow<'_, str>> for RoomIdOrAliasId {
 
 common_impls!(RoomIdOrAliasId, "a Matrix room ID or room alias ID");
 
+impl From<RoomId> for RoomIdOrAliasId {
+    fn from(RoomId { full_id, colon_idx }: RoomId) -> Self {
+        Self { full_id, colon_idx }
+    }
+}
+
+impl From<RoomAliasId> for RoomIdOrAliasId {
+    fn from(RoomAliasId { full_id, colon_idx }: RoomAliasId) -> Self {
+        Self { full_id, colon_idx }
+    }
+}
+
+impl TryFrom<RoomIdOrAliasId> for RoomId {
+    type Error = RoomAliasId;
+
+    fn try_from(id: RoomIdOrAliasId) -> Result<RoomId, RoomAliasId> {
+        match id.variant() {
+            Variant::RoomId => Ok(RoomId {
+                full_id: id.full_id,
+                colon_idx: id.colon_idx,
+            }),
+            Variant::RoomAliasId => Err(RoomAliasId {
+                full_id: id.full_id,
+                colon_idx: id.colon_idx,
+            }),
+        }
+    }
+}
+
+impl TryFrom<RoomIdOrAliasId> for RoomAliasId {
+    type Error = RoomId;
+
+    fn try_from(id: RoomIdOrAliasId) -> Result<RoomAliasId, RoomId> {
+        match id.variant() {
+            Variant::RoomAliasId => Ok(RoomAliasId {
+                full_id: id.full_id,
+                colon_idx: id.colon_idx,
+            }),
+            Variant::RoomId => Err(RoomId {
+                full_id: id.full_id,
+                colon_idx: id.colon_idx,
+            }),
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use std::convert::TryFrom;