Allow empty maps; Write tests

tests/value.rs

@@ -45,6 +45,11 @@ fn list() {
     );
 }
 
+#[test]
+fn empty_list() {
+    assert_eq!(interpret("[]"), Ok(Value::List(List::new())));
+}
+
 #[test]
 fn map() {
     let map = Map::new();
@@ -56,6 +61,11 @@ fn map() {
     assert_eq!(interpret("{ x = 1, foo = 'bar' }"), Ok(Value::Map(map)));
 }
 
+#[test]
+fn empty_map() {
+    assert_eq!(interpret("{}"), Ok(Value::Map(Map::new())));
+}
+
 #[test]
 fn map_types() {
     let map = Map::new();
@@ -119,7 +129,5 @@ fn option() {
 
 #[test]
 fn range() {
-    let result = interpret("0..100");
+    assert_eq!(interpret("0..100"), Ok(Value::range(0, 100)));
-
-    assert_eq!(Ok(Value::range(0, 100)), result);
 }

tree-sitter-dust/grammar.js

@@ -263,9 +263,11 @@ module.exports = grammar({
       ),
 
     map: $ =>
+      prec(
+        1,
         seq(
           '{',
-        repeat1(
+          repeat(
             seq(
               $.identifier,
               optional(
@@ -278,6 +280,7 @@ module.exports = grammar({
           ),
           '}',
         ),
+      ),
 
     option: $ =>
       choice(

tree-sitter-dust/src/grammar.json

@@ -769,6 +769,9 @@
       ]
     },
     "map": {
+      "type": "PREC",
+      "value": 1,
+      "content": {
         "type": "SEQ",
         "members": [
           {
@@ -776,7 +779,7 @@
             "value": "{"
           },
           {
-          "type": "REPEAT1",
+            "type": "REPEAT",
             "content": {
               "type": "SEQ",
               "members": [
@@ -824,6 +827,7 @@
             "value": "}"
           }
         ]
+      }
     },
     "option": {
       "type": "CHOICE",

tree-sitter-dust/src/node-types.json

@@ -413,7 +413,7 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": true,
+      "required": false,
       "types": [
         {
           "type": "identifier",