investigate feature complete inspect()

src/value/mod.rs

@@ -109,15 +109,16 @@ fn visit_quoted_string(buf: &mut String, force_double_quote: bool, string: &str)
 
 impl Value {
     pub fn is_null(&self, span: Span) -> SassResult<bool> {
-        match self {
-            &Value::Null => Ok(true),
-            Value::Ident(i, QuoteKind::None) if i.is_empty() => Ok(true),
+        Ok(match self {
+            &Value::Null => true,
+            Value::Ident(i, QuoteKind::None) if i.is_empty() => true,
             Self::BinaryOp(..) | Self::Paren(..) | Self::UnaryOp(..) => {
-                self.clone().eval(span)?.is_null(span)
-            }
-            Self::List(v, _, Brackets::None) => Ok(v.iter().all(|f| f.is_null(span).unwrap())),
-            _ => Ok(false),
+                self.clone().eval(span)?.is_null(span)?
             }
+            Self::List(v, _, Brackets::Bracketed) if v.is_empty() => false,
+            Self::List(v, ..) => v.iter().all(|f| f.is_null(span).unwrap()),
+            _ => false,
+        })
     }
 
     pub fn to_css_string(&self, span: Span) -> SassResult<String> {
@@ -136,6 +137,7 @@ impl Value {
                 )
                     .into())
             }
+            // TODO: should to_css_string on function fail?
             Self::Function(func) => format!("get-function(\"{}\")", func.name()),
             Self::List(vals, sep, brackets) => match brackets {
                 Brackets::None => vals
@@ -253,6 +255,8 @@ impl Value {
         }
     }
 
+    // TODO:
+    // https://github.com/sass/dart-sass/blob/d4adea7569832f10e3a26d0e420ae51640740cfb/lib/src/ast/sass/expression/list.dart#L39
     pub fn inspect(&self, span: Span) -> SassResult<String> {
         Ok(match self {
             Value::List(v, _, brackets) if v.is_empty() => match brackets {
@@ -296,7 +300,7 @@ impl Value {
                     .collect::<SassResult<Vec<String>>>()?
                     .join(", ")
             ),
-            Value::Paren(v) => format!("({})", v.inspect(span)?),
+            Value::Paren(v) => v.inspect(span)?,
             v => v.to_css_string(span)?,
         })
     }

tests/inspect.rs

@@ -0,0 +1,112 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    inspect_unquoted_string,
+    "a {\n  color: inspect(foo)\n}\n",
+    "a {\n  color: foo;\n}\n"
+);
+test!(
+    inspect_dbl_quoted_string,
+    "a {\n  color: inspect(\"foo\")\n}\n",
+    "a {\n  color: \"foo\";\n}\n"
+);
+test!(
+    inspect_sgl_quoted_string,
+    "a {\n  color: inspect(\"foo\")\n}\n",
+    "a {\n  color: \"foo\";\n}\n"
+);
+test!(
+    inspect_unitless_number,
+    "a {\n  color: inspect(1)\n}\n",
+    "a {\n  color: 1;\n}\n"
+);
+test!(
+    inspect_px_number,
+    "a {\n  color: inspect(1px)\n}\n",
+    "a {\n  color: 1px;\n}\n"
+);
+test!(
+    inspect_color_3_hex,
+    "a {\n  color: inspect(#fff)\n}\n",
+    "a {\n  color: #fff;\n}\n"
+);
+test!(
+    inspect_color_6_hex,
+    "a {\n  color: inspect(#ffffff)\n}\n",
+    "a {\n  color: #ffffff;\n}\n"
+);
+test!(
+    inspect_color_name,
+    "a {\n  color: inspect(red)\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    inspect_true,
+    "a {\n  color: inspect(true)\n}\n",
+    "a {\n  color: true;\n}\n"
+);
+test!(
+    inspect_false,
+    "a {\n  color: inspect(false)\n}\n",
+    "a {\n  color: false;\n}\n"
+);
+test!(
+    inspect_null,
+    "a {\n  color: inspect(null)\n}\n",
+    "a {\n  color: null;\n}\n"
+);
+test!(
+    inspect_empty_brackets,
+    "a {\n  color: inspect([]);\n}\n",
+    "a {\n  color: [];\n}\n"
+);
+test!(
+    inspect_comma_separated_one_val,
+    "a {\n  color: inspect((1, ));\n}\n",
+    "a {\n  color: (1,);\n}\n"
+);
+test!(
+    inspect_comma_separated_one_val_bracketed,
+    "a {\n  color: inspect([1, ]);\n}\n",
+    "a {\n  color: [1,];\n}\n"
+);
+test!(
+    inspect_space_separated_one_val_bracketed,
+    "a {\n  color: inspect(append((), 1, space));\n}\n",
+    "a {\n  color: 1;\n}\n"
+);
+test!(
+    inspect_list_of_empty_list,
+    "a {\n  color: inspect(((), ()));\n}\n",
+    "a {\n  color: (), ();\n}\n"
+);
+test!(
+    #[ignore]
+    inspect_comma_separated_list_of_comma_separated_lists,
+    "a {\n  color: inspect([(1, 2), (3, 4)]);\n}\n",
+    "a {\n  color: [(1, 2), (3, 4)];\n}\n"
+);
+test!(
+    inspect_empty_list,
+    "a {\n  color: inspect(())\n}\n",
+    "a {\n  color: ();\n}\n"
+);
+test!(
+    inspect_spaced_list,
+    "a {\n  color: inspect(1 2 3)\n}\n",
+    "a {\n  color: 1 2 3;\n}\n"
+);
+test!(
+    #[ignore]
+    inspect_comma_list,
+    "a {\n  color: inspect(1, 2, 3)\n}\n",
+    "a {\n  color: 1, 2, 3;\n}\n"
+);
+test!(
+    inspect_parens,
+    "a {\n  color: inspect((((a))));\n}\n",
+    "a {\n  color: a;\n}\n"
+);

tests/meta.rs

@@ -187,91 +187,6 @@ test!(
     "a {\n  color: unitless(foo)\n}\n",
     "a {\n  color: true;\n}\n"
 );
-test!(
-    inspect_unquoted_string,
-    "a {\n  color: inspect(foo)\n}\n",
-    "a {\n  color: foo;\n}\n"
-);
-test!(
-    inspect_dbl_quoted_string,
-    "a {\n  color: inspect(\"foo\")\n}\n",
-    "a {\n  color: \"foo\";\n}\n"
-);
-test!(
-    inspect_sgl_quoted_string,
-    "a {\n  color: inspect(\"foo\")\n}\n",
-    "a {\n  color: \"foo\";\n}\n"
-);
-test!(
-    inspect_unitless_number,
-    "a {\n  color: inspect(1)\n}\n",
-    "a {\n  color: 1;\n}\n"
-);
-test!(
-    inspect_px_number,
-    "a {\n  color: inspect(1px)\n}\n",
-    "a {\n  color: 1px;\n}\n"
-);
-test!(
-    inspect_color_3_hex,
-    "a {\n  color: inspect(#fff)\n}\n",
-    "a {\n  color: #fff;\n}\n"
-);
-test!(
-    inspect_color_6_hex,
-    "a {\n  color: inspect(#ffffff)\n}\n",
-    "a {\n  color: #ffffff;\n}\n"
-);
-test!(
-    inspect_color_name,
-    "a {\n  color: inspect(red)\n}\n",
-    "a {\n  color: red;\n}\n"
-);
-test!(
-    inspect_true,
-    "a {\n  color: inspect(true)\n}\n",
-    "a {\n  color: true;\n}\n"
-);
-test!(
-    inspect_false,
-    "a {\n  color: inspect(false)\n}\n",
-    "a {\n  color: false;\n}\n"
-);
-test!(
-    inspect_null,
-    "a {\n  color: inspect(null)\n}\n",
-    "a {\n  color: null;\n}\n"
-);
-test!(
-    inspect_empty_brackets,
-    "a {\n  color: inspect([]);\n}\n",
-    "a {\n  color: [];\n}\n"
-);
-test!(
-    inspect_comma_separated_one_val,
-    "a {\n  color: inspect((1, ));\n}\n",
-    "a {\n  color: (1,);\n}\n"
-);
-test!(
-    inspect_comma_separated_one_val_bracketed,
-    "a {\n  color: inspect([1, ]);\n}\n",
-    "a {\n  color: [1,];\n}\n"
-);
-test!(
-    inspect_space_separated_one_val_bracketed,
-    "a {\n  color: inspect(append((), 1, space));\n}\n",
-    "a {\n  color: 1;\n}\n"
-);
-test!(
-    inspect_list_of_empty_list,
-    "a {\n  color: inspect(((), ()));\n}\n",
-    "a {\n  color: (), ();\n}\n"
-);
-test!(
-    inspect_comma_separated_list_of_comma_separated_lists,
-    "a {\n  color: inspect([(1, 2), (3, 4)]);\n}\n",
-    "a {\n  color: [(1, 2), (3, 4)];\n}\n"
-);
 test!(
     variable_does_exist,
     "$a: red; a {\n  color: variable-exists(a)\n}\n",
@@ -339,19 +254,3 @@ error!(
     mixin_exists_non_string,
     "a {color: mixin-exists(12px)}", "Error: $name: 12px is not a string."
 );
-test!(
-    inspect_empty_list,
-    "a {\n  color: inspect(())\n}\n",
-    "a {\n  color: ();\n}\n"
-);
-test!(
-    inspect_spaced_list,
-    "a {\n  color: inspect(1 2 3)\n}\n",
-    "a {\n  color: 1 2 3;\n}\n"
-);
-test!(
-    #[ignore]
-    inspect_comma_list,
-    "a {\n  color: inspect(1, 2, 3)\n}\n",
-    "a {\n  color: 1, 2, 3;\n}\n"
-);