refactor(xatu): use conversion traits in parser

src/xatu/parser.rs

@@ -61,7 +61,7 @@ fn convert_node(node: rnix::SyntaxNode) -> Option<ast::Node> {
 fn convert_apply(node: rnix::SyntaxNode) -> Option<ast::Node> {
     let apply = rnix::ast::Apply::cast(node)?;
     let range = apply.syntax().text_range().into();
-    let data = convert_apply_data(apply)?;
+    let data = apply.try_into().ok()?;
 
     Some(ast::Node {
         range,
@@ -74,49 +74,66 @@ fn convert_inherit(node: rnix::SyntaxNode) -> Option<ast::Node> {
 
     Some(ast::Node {
         range: inherit.syntax().text_range().into(),
-        data: ast::NodeData::Inherit(convert_inherit_data(inherit)),
+        data: ast::NodeData::Inherit(inherit.into()),
     })
 }
 
-fn convert_apply_data(apply: rnix::ast::Apply) -> Option<ast::Apply> {
-    Some(ast::Apply {
-        function: convert_expr(apply.lambda()?)?,
-    })
-}
+impl TryFrom<rnix::ast::Apply> for ast::Apply {
+    type Error = ();
 
-fn convert_expr(expr: rnix::ast::Expr) -> Option<ast::Expr> {
-    match expr {
-        rnix::ast::Expr::Ident(ident) => Some(ast::Expr::Ident(convert_ident(ident)?)),
-        rnix::ast::Expr::Select(select) => {
-            Some(ast::Expr::Select(Box::new(convert_select(select)?)))
-        }
-        _ => None,
+    fn try_from(apply: rnix::ast::Apply) -> Result<Self, Self::Error> {
+        Ok(Self {
+            function: apply.lambda().ok_or(())?.try_into()?,
+        })
     }
 }
 
-fn convert_ident(ident: rnix::ast::Ident) -> Option<ast::Ident> {
-    Some(ast::Ident {
-        name: ident.ident_token()?.text().to_owned(),
-    })
+impl TryFrom<rnix::ast::Expr> for ast::Expr {
+    type Error = ();
+
+    fn try_from(expr: rnix::ast::Expr) -> Result<Self, Self::Error> {
+        match expr {
+            rnix::ast::Expr::Ident(ident) => Ok(Self::Ident(ident.try_into()?)),
+            rnix::ast::Expr::Select(select) => Ok(Self::Select(Box::new(select.try_into()?))),
+            _ => Err(()),
+        }
+    }
 }
 
-fn convert_select(select: rnix::ast::Select) -> Option<ast::Select> {
-    Some(ast::Select {
-        receiver: convert_expr(select.expr()?)?,
-        attrs: select
-            .attrpath()?
-            .attrs()
-            .map(|attr| match attr {
-                rnix::ast::Attr::Ident(ident) => convert_ident(ident),
-                _ => None,
-            })
-            .collect::<Option<Vec<_>>>()?,
-    })
+impl TryFrom<rnix::ast::Ident> for ast::Ident {
+    type Error = ();
+
+    fn try_from(ident: rnix::ast::Ident) -> Result<Self, Self::Error> {
+        Ok(Self {
+            name: ident.ident_token().ok_or(())?.text().to_owned(),
+        })
+    }
 }
 
-fn convert_inherit_data(inherit: rnix::ast::Inherit) -> ast::Inherit {
-    ast::Inherit {
-        attr_count: inherit.attrs().count(),
+impl TryFrom<rnix::ast::Select> for ast::Select {
+    type Error = ();
+
+    fn try_from(select: rnix::ast::Select) -> Result<Self, Self::Error> {
+        Ok(Self {
+            receiver: select.expr().ok_or(())?.try_into()?,
+            attrs: select
+                .attrpath()
+                .ok_or(())?
+                .attrs()
+                .map(|attr| match attr {
+                    rnix::ast::Attr::Ident(ident) => ident.try_into(),
+                    _ => Err(()),
+                })
+                .collect::<Result<Vec<_>, _>>()?,
+        })
+    }
+}
+
+impl From<rnix::ast::Inherit> for ast::Inherit {
+    fn from(inherit: rnix::ast::Inherit) -> Self {
+        Self {
+            attr_count: inherit.attrs().count(),
+        }
     }
 }