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!(Ok(Value::range(0, 100)), result);
+    assert_eq!(interpret("0..100"), Ok(Value::range(0, 100)));
 }

tree-sitter-dust/grammar.js

@@ -263,20 +263,23 @@ module.exports = grammar({
       ),
 
     map: $ =>
-      seq(
-        '{',
-        repeat1(
-          seq(
-            $.identifier,
-            optional(
-              $.type_specification,
+      prec(
+        1,
+        seq(
+          '{',
+          repeat(
+            seq(
+              $.identifier,
+              optional(
+                $.type_specification,
+              ),
+              '=',
+              $.statement,
+              optional(','),
             ),
-            '=',
-            $.statement,
-            optional(','),
           ),
+          '}',
         ),
-        '}',
       ),
 
     option: $ =>

tree-sitter-dust/src/grammar.json

@@ -769,61 +769,65 @@
       ]
     },
     "map": {
-      "type": "SEQ",
-      "members": [
-        {
-          "type": "STRING",
-          "value": "{"
-        },
-        {
-          "type": "REPEAT1",
-          "content": {
-            "type": "SEQ",
-            "members": [
-              {
-                "type": "SYMBOL",
-                "name": "identifier"
-              },
-              {
-                "type": "CHOICE",
-                "members": [
-                  {
-                    "type": "SYMBOL",
-                    "name": "type_specification"
-                  },
-                  {
-                    "type": "BLANK"
-                  }
-                ]
-              },
-              {
-                "type": "STRING",
-                "value": "="
-              },
-              {
-                "type": "SYMBOL",
-                "name": "statement"
-              },
-              {
-                "type": "CHOICE",
-                "members": [
-                  {
-                    "type": "STRING",
-                    "value": ","
-                  },
-                  {
-                    "type": "BLANK"
-                  }
-                ]
-              }
-            ]
+      "type": "PREC",
+      "value": 1,
+      "content": {
+        "type": "SEQ",
+        "members": [
+          {
+            "type": "STRING",
+            "value": "{"
+          },
+          {
+            "type": "REPEAT",
+            "content": {
+              "type": "SEQ",
+              "members": [
+                {
+                  "type": "SYMBOL",
+                  "name": "identifier"
+                },
+                {
+                  "type": "CHOICE",
+                  "members": [
+                    {
+                      "type": "SYMBOL",
+                      "name": "type_specification"
+                    },
+                    {
+                      "type": "BLANK"
+                    }
+                  ]
+                },
+                {
+                  "type": "STRING",
+                  "value": "="
+                },
+                {
+                  "type": "SYMBOL",
+                  "name": "statement"
+                },
+                {
+                  "type": "CHOICE",
+                  "members": [
+                    {
+                      "type": "STRING",
+                      "value": ","
+                    },
+                    {
+                      "type": "BLANK"
+                    }
+                  ]
+                }
+              ]
+            }
+          },
+          {
+            "type": "STRING",
+            "value": "}"
           }
-        },
-        {
-          "type": "STRING",
-          "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",