add MessageTextFilter

src/dispatching/dispatchers/filter/filters/mod.rs

@@ -0,0 +1,3 @@
+pub use text::*;
+
+mod text;

src/dispatching/dispatchers/filter/filters/text.rs

@@ -0,0 +1,82 @@
+use crate::dispatching::Filter;
+use crate::types::Message;
+
+pub struct MessageTextFilter {
+    text: String,
+}
+
+impl Filter<Message> for MessageTextFilter {
+    fn test(&self, value: &Message) -> bool {
+        match value.text() {
+            Some(text) => self.text == text,
+            None => false
+        }
+    }
+}
+
+impl MessageTextFilter {
+    pub fn new(text: String) -> Self {
+        Self {
+            text
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn texts_are_equal() {
+        let filter = MessageTextFilter::new("text".to_string());
+        let json = r#"{
+          "message_id": 199785,
+          "from": {
+           "id": 250918540,
+           "is_bot": false,
+           "first_name": "Андрей",
+           "last_name": "Власов",
+           "username": "aka_dude",
+           "language_code": "en"
+          },
+          "chat": {
+           "id": 250918540,
+           "first_name": "Андрей",
+           "last_name": "Власов",
+           "username": "aka_dude",
+           "type": "private"
+          },
+          "date": 1568289890,
+          "text": "text"
+         }"#;
+        let message = serde_json::from_str::<Message>(json).unwrap();
+        assert!(filter.test(&message));
+    }
+
+    #[test]
+    fn texts_are_not_equal() {
+        let filter = MessageTextFilter::new("text".to_string());
+        let json = r#"{
+          "message_id": 199785,
+          "from": {
+           "id": 250918540,
+           "is_bot": false,
+           "first_name": "Андрей",
+           "last_name": "Власов",
+           "username": "aka_dude",
+           "language_code": "en"
+          },
+          "chat": {
+           "id": 250918540,
+           "first_name": "Андрей",
+           "last_name": "Власов",
+           "username": "aka_dude",
+           "type": "private"
+          },
+          "date": 1568289890,
+          "text": "not equal text"
+         }"#;
+        let message = serde_json::from_str::<Message>(json).unwrap();
+        assert_eq!(filter.test(&message), false);
+    }
+}

src/dispatching/dispatchers/filter/mod.rs

@@ -10,6 +10,7 @@ use crate::{
     types::{CallbackQuery, ChosenInlineResult, Message, Update, UpdateKind},
 };
 
+pub mod filters;
 pub mod error_policy;
 
 type Handlers<'a, T, E> =