1 files changed, 79 insertions, 0 deletions
diff --git a/crates/config/src/value.rs b/crates/config/src/value.rs
new file mode 100644
index 0000000..e59ccb9
--- /dev/null
+++ b/crates/config/src/value.rs
@@ -0,0 +1,79 @@
+use mlua::Value;
+
+/// A scalar (or short list of scalars) read from `srd.set(key, value)`.
+/// Deliberately simpler than the legacy C++ `LuaConfigValue`, which also had
+/// `Table`/`Function` variants that, per docs/PRIOR_ART.md, were never
+/// actually exercised by the flat dotted-key config style the example
+/// configs (and `docs/DEFAULTS.md`) actually use.
+#[derive(Debug, Clone, PartialEq)]
+pub enum ConfigValue {
+    String(String),
+    Number(f64),
+    Bool(bool),
+    List(Vec<String>),
+}
+
+impl ConfigValue {
+    pub fn from_lua(value: &Value) -> Option<Self> {
+        match value {
+            Value::String(s) => Some(ConfigValue::String(s.to_str().ok()?.to_string())),
+            Value::Number(n) => Some(ConfigValue::Number(*n)),
+            Value::Integer(i) => Some(ConfigValue::Number(*i as f64)),
+            Value::Boolean(b) => Some(ConfigValue::Bool(*b)),
+            Value::Table(t) => {
+                let mut items = Vec::new();
+                for pair in t.clone().sequence_values::<String>() {
+                    items.push(pair.ok()?);
+                }
+                Some(ConfigValue::List(items))
+            }
+            _ => None,
+        }
+    }
+
+    pub fn as_str(&self) -> Option<&str> {
+        match self {
+            ConfigValue::String(s) => Some(s),
+            _ => None,
+        }
+    }
+
+    pub fn as_f64(&self) -> Option<f64> {
+        match self {
+            ConfigValue::Number(n) => Some(*n),
+            _ => None,
+        }
+    }
+
+    pub fn as_bool(&self) -> Option<bool> {
+        match self {
+            ConfigValue::Bool(b) => Some(*b),
+            _ => None,
+        }
+    }
+
+    pub fn as_list(&self) -> Option<&[String]> {
+        match self {
+            ConfigValue::List(l) => Some(l),
+            _ => None,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use mlua::Lua;
+
+    #[test]
+    fn converts_string_number_bool_and_list() {
+        let lua = Lua::new();
+        assert_eq!(ConfigValue::from_lua(&lua.load("'hi'").eval().unwrap()), Some(ConfigValue::String("hi".into())));
+        assert_eq!(ConfigValue::from_lua(&lua.load("42").eval().unwrap()), Some(ConfigValue::Number(42.0)));
+        assert_eq!(ConfigValue::from_lua(&lua.load("true").eval().unwrap()), Some(ConfigValue::Bool(true)));
+        assert_eq!(
+            ConfigValue::from_lua(&lua.load("{'1','2','3'}").eval().unwrap()),
+            Some(ConfigValue::List(vec!["1".into(), "2".into(), "3".into()]))
+        );
+    }
+}