WIP if-branches in chats

src/chat.rs

@@ -18,6 +18,7 @@ pub const TOKEN_WARN: &str = "warn";
 pub const TOKEN_SLEEP: &str = "sleep";
 pub const TOKEN_SET: &str = "set";
 pub const TOKEN_IF: &str = "if";
+pub const TOKEN_THEN: &str = "then";
 pub const TOKEN_GOTO: &str = "goto";
 pub const TOKEN_LABEL: &str = "label";
 pub const TOKEN_SCRIPT: &str = "script";
@@ -43,6 +44,7 @@ pub const NON_CHOICE_TOKENS: &[&str] = &[
     TOKEN_SLEEP,
     TOKEN_SET,
     TOKEN_IF,
+    TOKEN_THEN,
     TOKEN_GOTO,
     TOKEN_LABEL,
     TOKEN_SCRIPT,
@@ -118,6 +120,7 @@ pub enum ChatEvent {
     RunScript(String),
     SleepSeconds(f64),
     SetVariable(String),
+    GotoIf(String, ChatPos),
 }
 
 // This is the only place where any YAML interaction should be happening.
@@ -351,7 +354,11 @@ impl ChatDB {
                         result = Some(Value::String(value_string.into()));
                     }
                     Some(Value::Mapping(mapping)) => {
-                        if let Some((_choicetext, subconversation, _)) = self.search_choice(value) {
+                        if let Some(branch) = mapping.get(TOKEN_THEN) {
+                            result = Some(Value::Mapping(mapping.clone()));
+                            next_pointer = Some(branch.clone());
+                        }
+                        else if let Some((_choicetext, subconversation, _)) = self.search_choice(value) {
                             result = Some(Value::Mapping(mapping.clone()));
                             next_pointer = Some(subconversation);
                         }
@@ -430,7 +437,11 @@ impl ChatDB {
                 for (key, value) in &map {
                     let key = key.as_str();
                     match (key, value) {
-                        (Some(TOKEN_IF), _) => {} // TODO
+                        (Some(TOKEN_IF), Value::String(condition)) => {
+                            let mut pos = chat.position.clone();
+                            pos.push(0);
+                            event.send(ChatEvent::GotoIf(condition.into(), pos));
+                        }
                         (Some(TOKEN_SOUND), Value::String(sound_name)) => {
                             sound = sound_name.clone();
                         }
@@ -667,6 +678,11 @@ pub fn handle_chat_events(
                     vars.set_in_scope(&chat.talker.actor_id, string, "".into());
                 }
             }
+            ChatEvent::GotoIf(condition, goto) => {
+                if condition != "" {
+                    chat.position = goto.clone();
+                }
+            }
         }
     }
 }

src/chats/serenity.yaml

@@ -17,8 +17,14 @@
 
 
 - chat: Icarus
+- if:
+  then:
+  - Oh hey, you're back!
+  - Nice to see you again!
+  - goto: back
 - Oh hey, you're awake!
 - set: talked_before
+- label: back
 - I found you drifting out cold, and thought, I better watch over you.
 - Took us here behind that moonlet, to shield you from the micros.
 - Thank you!: