use Identifier for FuncArg

src/args.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::mem;
 
 use codemap::{Span, Spanned};
 
@@ -20,7 +21,7 @@ pub(crate) struct FuncArgs(pub Vec<FuncArg>);
 
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub(crate) struct FuncArg {
-    pub name: String,
+    pub name: Identifier,
     pub default: Option<Vec<Token>>,
     pub is_variadic: bool,
 }
@@ -128,10 +129,10 @@ impl CallArgs {
         }
     }
 
-    pub fn get(
+    pub fn get<T: Into<Identifier>>(
         &mut self,
         position: usize,
-        name: String,
+        name: T,
         scope: &Scope,
         super_selector: &Selector,
     ) -> Option<SassResult<Spanned<Value>>> {
@@ -244,7 +245,7 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
                         ',' => {
                             toks.next();
                             args.push(FuncArg {
-                                name: name.replace('_', "-"),
+                                name: name.node.into(),
                                 default: Some(default),
                                 is_variadic,
                             });
@@ -252,7 +253,7 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
                         }
                         ')' => {
                             args.push(FuncArg {
-                                name: name.replace('_', "-"),
+                                name: name.node.into(),
                                 default: Some(default),
                                 is_variadic,
                             });
@@ -285,7 +286,7 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
                 is_variadic = true;
 
                 args.push(FuncArg {
-                    name: name.replace('_', "-"),
+                    name: name.node.into(),
                     default: Some(default),
                     is_variadic,
                 });
@@ -294,7 +295,7 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
             ')' => {
                 close_paren_span = span;
                 args.push(FuncArg {
-                    name: name.replace('_', "-"),
+                    name: name.node.into(),
                     default: if default.is_empty() {
                         None
                     } else {
@@ -305,7 +306,7 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
                 break;
             }
             ',' => args.push(FuncArg {
-                name: name.replace('_', "-"),
+                name: name.node.into(),
                 default: None,
                 is_variadic,
             }),
@@ -399,9 +400,8 @@ pub(crate) fn eat_call_args<I: Iterator<Item = Token>>(
             } else {
                 CallArg::Named(name.as_str().into())
             },
-            val.clone(),
+            mem::take(&mut val),
         );
-        val.clear();
         devour_whitespace(toks);
 
         if toks.peek().is_none() {

src/atrule/function.rs

@@ -1,3 +1,5 @@
+use std::mem;
+
 use super::eat_stmts;
 
 use codemap::{Span, Spanned};
@@ -75,7 +77,7 @@ impl Function {
                 let span = args.span();
                 let arg_list = Value::ArgList(args.get_variadic(&scope, super_selector)?);
                 self.scope.insert_var(
-                    &arg.name,
+                    arg.name.clone(),
                     Spanned {
                         node: arg_list,
                         span,
@@ -87,7 +89,7 @@ impl Function {
                 Some(v) => v?,
                 None => match arg.default.as_mut() {
                     Some(v) => Value::from_tokens(
-                        &mut std::mem::take(v).into_iter().peekmore(),
+                        &mut mem::take(v).into_iter().peekmore(),
                         &scope,
                         super_selector,
                     )?,
@@ -98,8 +100,8 @@ impl Function {
                     }
                 },
             };
-            scope.insert_var(&arg.name, val.clone())?;
+            scope.insert_var(arg.name.clone(), val.clone())?;
-            self.scope.insert_var(&arg.name, val)?;
+            self.scope.insert_var(mem::take(&mut arg.name), val)?;
         }
         Ok(())
     }

src/atrule/mixin.rs

@@ -1,3 +1,4 @@
+use std::mem;
 use std::vec::IntoIter;
 
 use codemap::{Span, Spanned};
@@ -67,7 +68,7 @@ impl Mixin {
             if arg.is_variadic {
                 let span = args.span();
                 self.scope.insert_var(
-                    &arg.name,
+                    mem::take(&mut arg.name),
                     Spanned {
                         node: Value::ArgList(args.get_variadic(scope, super_selector)?),
                         span,
@@ -90,7 +91,7 @@ impl Mixin {
                     }
                 },
             };
-            self.scope.insert_var(&arg.name, val)?;
+            self.scope.insert_var(mem::take(&mut arg.name), val)?;
         }
         Ok(self)
     }

src/common.rs

@@ -146,3 +146,9 @@ impl Display for Identifier {
         write!(f, "{}", self.0)
     }
 }
+
+impl Default for Identifier {
+    fn default() -> Self {
+        Self(String::new())
+    }
+}