Refactor handling of quotes inside interpolation

src/utils.rs

@@ -41,32 +41,47 @@ pub(crate) fn devour_whitespace_or_comment<I: Iterator<Item = W>, W: IsWhitespac
     found_whitespace
 }
 
-pub(crate) fn parse_interpolation<I: Iterator<Item = Token>>(
-    tokens: &mut I,
+fn _parse_interpolation<I: Iterator<Item = Token>>(
+    tokens: &mut Peekable<I>,
     scope: &Scope,
 ) -> SassResult<Vec<Token>> {
-    let mut val = Vec::new();
+    let mut val = String::new();
     while let Some(tok) = tokens.next() {
         match tok.kind {
             TokenKind::Symbol(Symbol::CloseCurlyBrace) => break,
             TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
                 todo!("invalid character in interpolation")
             }
-            TokenKind::Variable(ref v) => {
-                val.extend(Lexer::new(&scope.get_var(v)?.to_string()).collect::<Vec<Token>>())
+            q @ TokenKind::Symbol(Symbol::DoubleQuote)
+            | q @ TokenKind::Symbol(Symbol::SingleQuote) => {
+                val.push_str(&parse_quoted_string(tokens, scope, q)?.to_string())
             }
-            TokenKind::Interpolation => val.extend(parse_interpolation(tokens, scope)?),
-            _ => val.push(tok),
+            TokenKind::Variable(ref v) => {
+                val.push_str(&scope.get_var(v)?.clone().unquote().to_string())
+            }
+            TokenKind::Interpolation => val.push_str(
+                &_parse_interpolation(tokens, scope)?
+                    .iter()
+                    .map(|x| x.kind.to_string())
+                    .collect::<String>(),
+            ),
+            _ => val.push_str(&tok.kind.to_string()),
         }
     }
     Ok(Lexer::new(
-        &Value::from_tokens(&mut val.into_iter().peekable(), scope)
-            .unwrap()
-            .to_string()
-            .replace("\"", "")
-            .replace("'", ""),
+        &Value::from_tokens(&mut Lexer::new(&val).peekable(), scope)?
+            .eval()?
+            .unquote()
+            .to_string(),
     )
-    .collect::<Vec<Token>>())
+    .collect())
+}
+
+pub(crate) fn parse_interpolation<I: Iterator<Item = Token>>(
+    tokens: &mut Peekable<I>,
+    scope: &Scope,
+) -> SassResult<Vec<Token>> {
+    _parse_interpolation(tokens, scope)
 }
 
 pub(crate) struct VariableDecl {

src/value/mod.rs

@@ -66,7 +66,7 @@ impl Value {
     pub fn unquote(self) -> Self {
         match self {
             Self::Ident(s1, _) => Self::Ident(s1, QuoteKind::None),
-            _ => todo!(),
+            v => v,
         }
     }
 

tests/interpolation.rs

@@ -23,3 +23,8 @@ test!(
     "a {\n  --#{foo}: red;\n}\n",
     "a {\n  --foo: red;\n}\n"
 );
+test!(
+    preserves_inner_single_quotes,
+    "a {\n  color:  #{\"''\"};\n}\n",
+    "a {\n  color: '';\n}\n"
+);