Modify enum variant syntax

src/abstract_tree/value_node.rs

@@ -88,13 +88,13 @@ impl AbstractTree for ValueNode {
                 ValueNode::Range(start..=end)
             }
             "enum_instance" => {
-                let name_node = child.child(1).unwrap();
+                let name_node = child.child(0).unwrap();
                 let name = Identifier::from_syntax(name_node, source, context)?;
                 
-                let variant_node = child.child(3).unwrap();
+                let variant_node = child.child(2).unwrap();
                 let variant = Identifier::from_syntax(variant_node, source, context)?;
              
-                let expression = if let Some(expression_node) = child.child(5) {                
+                let expression = if let Some(expression_node) = child.child(4) {                
                     Some(Box::new(Expression::from_syntax(expression_node, source, context)?))
                 } else {
                     None

tests/built_in_type_definitions.rs

@@ -3,7 +3,7 @@ use dust_lang::*;
 #[test]
 fn option() {
     assert_eq!(
-        interpret("new Option:None"),
+        interpret("Option::None"),
         Ok(Value::Enum(EnumInstance::new(
             "Option".to_string(),
             "None".to_string(),
@@ -13,7 +13,7 @@ fn option() {
     assert_eq!(
         interpret(
             "
-            opt <Option<int>> = new Option:Some(1);
+            opt <Option<int>> = Option::Some(1);
 
             opt
             "
@@ -29,7 +29,7 @@ fn option() {
 #[test]
 fn result() {
     assert_eq!(
-        interpret("new Result:Ok(1)"),
+        interpret("Result::Ok(1)"),
         Ok(Value::Enum(EnumInstance::new(
             "Result".to_string(),
             "Ok".to_string(),
@@ -39,7 +39,7 @@ fn result() {
     assert_eq!(
         interpret(
             "
-            result = new Result:Error('uh-oh!')
+            result <Result<int, str>> = Result::Error('uh-oh!')
             result
             "
         ),

tree-sitter-dust/corpus/enums.txt

@@ -49,7 +49,7 @@ enum Foobar {
 Simple Enum Instance
 ================================================================================
 
-new Foobar:Foo
+Foobar::Foo
 
 --------------------------------------------------------------------------------
 
@@ -65,7 +65,7 @@ new Foobar:Foo
 Nested Enum Instance
 ================================================================================
 
-new Foobar:Bar(new BazBuf:Baz(123))
+FooBar::Bar(BazBuf::Baz(123))
 
 --------------------------------------------------------------------------------
 

tree-sitter-dust/grammar.js

@@ -339,7 +339,14 @@ module.exports = grammar({
           $.identifier,
           seq(
             $.identifier,
-            $.type_specification,
+            '<',
+            repeat1(
+              seq(          
+                $.type,
+                optional(','),
+              ),
+            ),
+            '>',
           ),
           seq('[', $.type, ']'),
           seq(
@@ -447,9 +454,8 @@ module.exports = grammar({
     enum_instance: $ =>
       prec.right(
         seq(
-          'new',
           $.identifier,
-          ':',
+          '::',
           $.identifier,
           optional(
             seq('(', $.expression, ')'),

tree-sitter-dust/src/grammar.json

@@ -1037,9 +1037,37 @@
                 "type": "SYMBOL",
                 "name": "identifier"
               },
+              {
+                "type": "STRING",
+                "value": "<"
+              },
+              {
+                "type": "REPEAT1",
+                "content": {
+                  "type": "SEQ",
+                  "members": [
                     {
                       "type": "SYMBOL",
-                "name": "type_specification"
+                      "name": "type"
+                    },
+                    {
+                      "type": "CHOICE",
+                      "members": [
+                        {
+                          "type": "STRING",
+                          "value": ","
+                        },
+                        {
+                          "type": "BLANK"
+                        }
+                      ]
+                    }
+                  ]
+                }
+              },
+              {
+                "type": "STRING",
+                "value": ">"
               }
             ]
           },
@@ -1385,17 +1413,13 @@
       "content": {
         "type": "SEQ",
         "members": [
-          {
-            "type": "STRING",
-            "value": "new"
-          },
           {
             "type": "SYMBOL",
             "name": "identifier"
           },
           {
             "type": "STRING",
-            "value": ":"
+            "value": "::"
           },
           {
             "type": "SYMBOL",

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

@@ -696,10 +696,6 @@
         {
           "type": "type",
           "named": true
-        },
-        {
-          "type": "type_specification",
-          "named": true
         }
       ]
     }
@@ -864,6 +860,10 @@
     "type": ":",
     "named": false
   },
+  {
+    "type": "::",
+    "named": false
+  },
   {
     "type": ";",
     "named": false