fix: Support Ron values

- `Char` variant needed to be converted to `String`.
- `Option` variant could be introduced generically.

NOTE: With `v0.9` of Ron, more types are introduced. Without tests, if these
do not deserialize into a supported type they will be treated as `Nil` type.

Signed-off-by: Brennan Kinney <5098581+polarathene@users.noreply.github.com>

Author: polarathene

src/file/format/ron.rs

@@ -2,62 +2,12 @@ use std::error::Error;
 
 use crate::format;
 use crate::map::Map;
-use crate::value::{Value, ValueKind};
+use crate::value::Value;
 
 pub fn parse(
     uri: Option<&String>,
     text: &str,
 ) -> Result<Map<String, Value>, Box<dyn Error + Send + Sync>> {
-    let value = from_ron_value(uri, ron::from_str(text)?)?;
+    let value = format::from_parsed_value(uri, ron::from_str(text)?);
     format::extract_root_table(uri, value)
 }
-
-fn from_ron_value(
-    uri: Option<&String>,
-    value: ron::Value,
-) -> Result<Value, Box<dyn Error + Send + Sync>> {
-    let kind = match value {
-        ron::Value::Option(value) => match value {
-            Some(value) => from_ron_value(uri, *value)?.kind,
-            None => ValueKind::Nil,
-        },
-
-        ron::Value::Unit => ValueKind::Nil,
-
-        ron::Value::Bool(value) => ValueKind::Boolean(value),
-
-        ron::Value::Number(value) => match value {
-            ron::Number::Float(value) => ValueKind::Float(value.get()),
-            ron::Number::Integer(value) => ValueKind::I64(value),
-        },
-
-        ron::Value::Char(value) => ValueKind::String(value.to_string()),
-
-        ron::Value::String(value) => ValueKind::String(value),
-
-        ron::Value::Seq(values) => {
-            let array = values
-                .into_iter()
-                .map(|value| from_ron_value(uri, value))
-                .collect::<Result<Vec<_>, _>>()?;
-
-            ValueKind::Array(array)
-        }
-
-        ron::Value::Map(values) => {
-            let map = values
-                .iter()
-                .map(|(key, value)| -> Result<_, Box<dyn Error + Send + Sync>> {
-                    let key = key.clone().into_rust::<String>()?;
-                    let value = from_ron_value(uri, value.clone())?;
-
-                    Ok((key, value))
-                })
-                .collect::<Result<Map<_, _>, _>>()?;
-
-            ValueKind::Table(map)
-        }
-    };
-
-    Ok(Value::new(uri, kind))
-}

src/format.rs

@@ -64,6 +64,7 @@ pub enum ParsedValue {
     String(String),
     Table(Map<String, Self>),
     Array(Vec<Self>),
+    Option(Option<Box<Self>>),
     // If nothing else above matched, use Nil:
     #[serde(deserialize_with = "deserialize_ignore_any")]
     Nil,
@@ -97,6 +98,12 @@ pub fn from_parsed_value(uri: Option<&String>, value: ParsedValue) -> Value {
 
             ValueKind::Array(l)
         }
+
+        // Boxed value must be dereferenced:
+        ParsedValue::Option(v) => match v {
+            Some(boxed) => from_parsed_value(uri, *boxed).kind,
+            None => ValueKind::Nil,
+        }
     };
 
     Value::new(uri, vk)
@@ -115,11 +122,18 @@ where
         // Config specific support for types that need string conversion:
         #[cfg(feature = "toml")]
         TomlDateTime(toml::value::Datetime),
+        #[cfg(feature = "ron")]
+        RonChar(ron::Value),
     }
 
-    Ok(match ParsedString::deserialize(deserializer)? {
-        ParsedString::String(v) => v,
+    match ParsedString::deserialize(deserializer)? {
+        ParsedString::String(v) => Ok(v),
         #[cfg(feature = "toml")]
-        ParsedString::TomlDateTime(v) => v.to_string(),
-    })
+        ParsedString::TomlDateTime(v) => Ok(v.to_string()),
+        #[cfg(feature = "ron")]
+        ParsedString::RonChar(variant) => match variant {
+            ron::Value::Char(v) => Ok(v.to_string()),
+            _ => Err(serde::de::Error::custom("should not be serialized to string"))
+        }
+    }
 }