implement goto token in chats

src/chat.rs

@@ -19,8 +19,10 @@ pub const TOKEN_IF: &str = "if";
 pub const TOKEN_GOTO: &str = "goto";
 pub const TOKEN_LABEL: &str = "label";
 pub const TOKEN_SCRIPT: &str = "script";
+pub const TOKEN_GOTO_EXIT: &str = "EXIT";
 
 pub const NAME_FALLBACK: &str = "Unknown";
+pub const MAX_BRANCH_DEPTH: usize = 64;
 
 pub const CHOICE_TIMER: f64 = 40.0 * settings::DEFAULT_CHAT_SPEED as f64;
 pub const LETTERS_PER_SECOND: f32 = 17.0;
@@ -168,6 +170,48 @@ impl ChatDB {
         return None;
     }
 
+    fn search_label_recursively(&self, sequence: &Value, label: &String, mut pos: ChatPos) -> Option<ChatPos> {
+        if pos.len() > MAX_BRANCH_DEPTH {
+            return None;
+        }
+        if let Some(vector) = sequence.as_sequence() {
+            for (index, item) in vector.iter().enumerate() {
+                match item {
+                    Value::String(_) => {}
+                    Value::Mapping(map) => {
+                        for (key, value) in map {
+                            if let Some(key) = key.as_str() {
+                                if key == TOKEN_LABEL {
+                                    if value == label {
+                                        pos.push(index);
+                                        return Some(pos);
+                                    }
+                                }
+                            }
+                            if value.is_sequence() {
+                                pos.push(index);
+                                if let Some(result) = self.search_label_recursively(
+                                        value, label, pos.clone()) {
+                                    return Some(result)
+                                }
+                                pos.pop();
+                            }
+                        }
+                    }
+                    _ => {}
+                }
+            }
+        }
+        return None;
+    }
+
+    fn search_label(&self, chat_id: usize, label: &String) -> Option<ChatPos> {
+        if label == TOKEN_GOTO_EXIT {
+            return Some(vec![]);
+        }
+        return self.search_label_recursively(&self.0[chat_id], label, vec![]);
+    }
+
     // returns true if we reached the end of a branch and possibly popped the position stack
     fn advance_pointer(&self, chat: &mut Chat) -> bool {
         let len = chat.position.len();
@@ -178,8 +222,6 @@ impl ChatDB {
 
         let mut popped = false;
         while chat.position.len() > 0 {
-            dbg!(&chat.position);
-            dbg!(self.at(chat.id, &chat.position));
             match self.at(chat.id, &chat.position) {
                 None => {
                     chat.position.pop();
@@ -276,7 +318,16 @@ impl ChatDB {
                         }
                         (Some(TOKEN_SET), _) => {}
                         (Some(TOKEN_IF), _) => {}
-                        (Some(TOKEN_GOTO), _) => {}
+                        (Some(TOKEN_GOTO), Value::String(label)) => {
+                            match self.search_label(chat.id, &label) {
+                                Some(pos) => {
+                                    chat.position = pos;
+                                }
+                                None => {
+                                    error!("Could not find goto label {label}!");
+                                }
+                            }
+                        }
                         (Some(TOKEN_SCRIPT), Value::String(script)) => {
                             event.send(ChatEvent::RunScript(script));
                         }