Revise function syntax

src/abstract_tree/function_call.rs

@@ -25,7 +25,7 @@ impl AbstractTree for FunctionCall {
     fn from_syntax_node(source: &str, node: Node, context: &Map) -> Result<Self> {
         Error::expect_syntax_node(source, "function_call", node)?;
 
-        let function_node = node.child(1).unwrap();
+        let function_node = node.child(0).unwrap();
         let function_expression =
             FunctionExpression::from_syntax_node(source, function_node, context)?;
         let function_type = function_expression.expected_type(context)?;
@@ -170,8 +170,8 @@ mod tests {
         assert_eq!(
             interpret(
                 "
-                foobar = (fn message <str>) <str> { message }
+                foobar = (message <str>) -> <str> { message }
-                (foobar 'Hiya')
+                foobar('Hiya')
                 ",
             ),
             Ok(Value::String("Hiya".to_string()))
@@ -183,11 +183,10 @@ mod tests {
         assert_eq!(
             interpret(
                 "
-                foobar = (fn cb <() -> str>) <str> {
+                foobar = (cb <() -> str>) <str> {
-                    (cb)
+                    cb()
                 }
-
+                foobar(() <str> { 'Hiya' })
-                (foobar (fn) <str> { 'Hiya' })
                 ",
             ),
             Ok(Value::String("Hiya".to_string()))
@@ -196,6 +195,6 @@ mod tests {
 
     #[test]
     fn evaluate_built_in_function_call() {
-        assert_eq!(interpret("(output 'Hiya')"), Ok(Value::Option(None)));
+        assert_eq!(interpret("output('Hiya')"), Ok(Value::Option(None)));
     }
 }

src/abstract_tree/index.rs

@@ -121,8 +121,8 @@ mod tests {
         let test = interpret(
             "
             x = [1 2 3]
-            y = (fn) <int> { 0 }
+            y = () -> <int> { 0 }
-            x:(y)
+            x:y()
             ",
         )
         .unwrap();

src/abstract_tree/type_definition.rs

@@ -279,10 +279,10 @@ mod tests {
     fn callback_type_check() {
         let result = interpret(
             "
-            x = (fn cb <() -> bool>) <bool> {
+            x = (cb <() -> bool>) <bool> {
-                (cb)
+                cb()
             }
-            (x (fn) <int> { 1 })
+            x(() <int> { 1 })
             ",
         );
 

src/abstract_tree/value_node.rs

@@ -33,7 +33,7 @@ impl AbstractTree for ValueNode {
                 let mut parameters = Vec::new();
                 let mut parameter_types = Vec::new();
 
-                for index in 2..child_count - 2 {
+                for index in 1..child_count - 3 {
                     let child = child.child(index).unwrap();
 
                     if child.kind() == "identifier" {
@@ -338,14 +338,14 @@ mod tests {
 
     #[test]
     fn evaluate_function() {
-        let result = interpret("(fn) <int> { 1 }");
+        let result = interpret("() -> <int> { 1 }");
         let value = result.unwrap();
         let function = value.as_function().unwrap();
 
         assert_eq!(&Vec::<Identifier>::with_capacity(0), function.parameters());
         assert_eq!(Ok(&Type::Integer), function.return_type());
 
-        let result = interpret("(fn x <bool>) <bool> {true}");
+        let result = interpret("(x <bool>) -> <bool> {true}");
         let value = result.unwrap();
         let function = value.as_function().unwrap();
 

tree-sitter-dust/corpus/async.txt

@@ -2,7 +2,7 @@
 Simple Async Statements
 ================================================================================
 
-async { (output 'Whaddup') }
+async { output ('Whaddup') }
 
 --------------------------------------------------------------------------------
 

tree-sitter-dust/corpus/for.txt

@@ -3,7 +3,7 @@ Simple For Loop
 ================================================================================
 
 for i in [1, 2, 3] {
-  (output i)
+  output(i)
 }
 
 --------------------------------------------------------------------------------
@@ -40,7 +40,7 @@ Nested For Loop
 
 for list in list_of_lists {
   for item in list {
-    (output item)
+    output(item)
   }
 }
 

tree-sitter-dust/corpus/functions.txt

@@ -2,7 +2,7 @@
 Anonymous Function
 ================================================================================
 
-(fn) <str> { "Hiya" }
+() <str> { "Hiya" }
 
 --------------------------------------------------------------------------------
 
@@ -20,10 +20,10 @@ Anonymous Function
                   (string))))))))))
 
 ================================================================================
-Function Declaration
+Function Assignment
 ================================================================================
 
-foobar = (fn x <int>, y <int>) <int> {
+foobar = (x <int>, y <int>) <int> {
   x + y
 }
 
@@ -57,10 +57,10 @@ foobar = (fn x <int>, y <int>) <int> {
                         (identifier)))))))))))))
 
 ================================================================================
-Function Call
+Identifier Function Call
 ================================================================================
 
-(foobar "Hiya")
+foobar("Hiya")
 
 --------------------------------------------------------------------------------
 
@@ -75,37 +75,36 @@ Function Call
             (string)))))))
 
 ================================================================================
-Function Expressions
+Index Function Call
 ================================================================================
 
-(foobar "Hiya")
+foo:bar("Hiya")
-(foo:bar "Hiya")
+
-((foobar) "Hiya")
+--------------------------------------------------------------------------------
-((fn msg <str>) <str> { msg } "Hiya")
+
+(root
+  (statement
+    (expression
+      (index
+        (expression
+          (identifier))
+        (expression
+          (function_call
+            (function_expression
+              (identifier))
+            (expression
+              (value
+                (string)))))))))
+
+================================================================================
+Double Function Call
+================================================================================
+
+foobar()("Hiya")
 
 --------------------------------------------------------------------------------
 
 (root
-  (statement
-    (expression
-      (function_call
-        (function_expression
-          (identifier))
-        (expression
-          (value
-            (string))))))
-  (statement
-    (expression
-      (function_call
-        (function_expression
-          (index
-            (expression
-              (identifier))
-            (expression
-              (identifier))))
-        (expression
-          (value
-            (string))))))
   (statement
     (expression
       (function_call
@@ -115,12 +114,21 @@ Function Expressions
               (identifier))))
         (expression
           (value
-            (string))))))
+            (string)))))))
+
+================================================================================
+Anonymous Function Call
+================================================================================
+
+(msg <str>) <str> { msg } ("Hiya");
+
+--------------------------------------------------------------------------------
+
+(root
   (statement
     (expression
       (function_call
         (function_expression
-          (value
           (function
             (identifier)
             (type_definition
@@ -130,7 +138,7 @@ Function Expressions
             (block
               (statement
                 (expression
-                    (identifier)))))))
+                  (identifier))))))
         (expression
           (value
             (string)))))))
@@ -139,7 +147,7 @@ Function Expressions
 Complex Function Call
 ================================================================================
 
-(foobar
+foobar(
     "hi"
     42
     {
@@ -180,35 +188,11 @@ Complex Function Call
 Callback Function Call
 ================================================================================
 
-x = (fn cb <() -> bool>) <bool> {
+x(() <bool> { true })
-    (cb)
-}
-
-(x (fn) <bool> { true })
 
 --------------------------------------------------------------------------------
 
 (root
-  (statement
-    (assignment
-      (identifier)
-      (assignment_operator)
-      (statement
-        (expression
-          (value
-            (function
-              (identifier)
-              (type_definition
-                (type
-                  (type)))
-              (type_definition
-                (type))
-              (block
-                (statement
-                  (expression
-                    (function_call
-                      (function_expression
-                        (identifier))))))))))))
   (statement
     (expression
       (function_call
@@ -229,7 +213,7 @@ x = (fn cb <() -> bool>) <bool> {
 Nested Function Call
 ================================================================================
 
-(from_json (read 'file.json'))
+from_json(read('file.json'))
 
 --------------------------------------------------------------------------------
 

tree-sitter-dust/corpus/index.txt

@@ -95,7 +95,7 @@ Nested Indexes
 Function Call Index
 ================================================================================
 
-x:(y):0
+x:y():0
 
 --------------------------------------------------------------------------------
 

tree-sitter-dust/corpus/while.txt

@@ -3,7 +3,7 @@ While Loop
 ================================================================================
 
 while true {
-  (output "This is a bad idea...")
+  output ("This is a bad idea...")
 }
 
 --------------------------------------------------------------------------------

tree-sitter-dust/grammar.js

@@ -78,7 +78,7 @@ module.exports = grammar({
         $.boolean,
         $.list,
         $.map,
-        $.option
+        $.option,
       ),
 
     integer: $ =>
@@ -177,7 +177,6 @@ module.exports = grammar({
         '}',
       ),
 
-
     option: $ =>
       choice(
         'none',
@@ -191,7 +190,7 @@ module.exports = grammar({
 
     index: $ =>
       prec.left(
-        1,
+        2,
         seq(
           $.expression,
           ':',
@@ -366,14 +365,13 @@ module.exports = grammar({
             '(',
             $.type,
             ')',
-          )
+          ),
         ),
       ),
 
     function: $ =>
       seq(
         '(',
-        'fn',
         repeat(
           seq(
             $.identifier,
@@ -387,18 +385,21 @@ module.exports = grammar({
       ),
 
     function_expression: $ =>
+      prec(
+        1,
         choice(
+          $.function,
           $.function_call,
           $.identifier,
           $.index,
-        $.value,
+        ),
       ),
 
     function_call: $ =>
       prec.right(
         seq(
-          '(',
           $.function_expression,
+          '(',
           optional($._expression_list),
           ')',
         ),

tree-sitter-dust/src/grammar.json

@@ -573,7 +573,7 @@
     },
     "index": {
       "type": "PREC_LEFT",
-      "value": 1,
+      "value": 2,
       "content": {
         "type": "SEQ",
         "members": [
@@ -1222,10 +1222,6 @@
           "type": "STRING",
           "value": "("
         },
-        {
-          "type": "STRING",
-          "value": "fn"
-        },
         {
           "type": "REPEAT",
           "content": {
@@ -1269,8 +1265,15 @@
       ]
     },
     "function_expression": {
+      "type": "PREC",
+      "value": 1,
+      "content": {
         "type": "CHOICE",
         "members": [
+          {
+            "type": "SYMBOL",
+            "name": "function"
+          },
           {
             "type": "SYMBOL",
             "name": "function_call"
@@ -1282,12 +1285,9 @@
           {
             "type": "SYMBOL",
             "name": "index"
-        },
-        {
-          "type": "SYMBOL",
-          "name": "value"
           }
         ]
+      }
     },
     "function_call": {
       "type": "PREC_RIGHT",
@@ -1295,14 +1295,14 @@
       "content": {
         "type": "SEQ",
         "members": [
-          {
-            "type": "STRING",
-            "value": "("
-          },
           {
             "type": "SYMBOL",
             "name": "function_expression"
           },
+          {
+            "type": "STRING",
+            "value": "("
+          },
           {
             "type": "CHOICE",
             "members": [

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

@@ -202,6 +202,10 @@
       "multiple": false,
       "required": true,
       "types": [
+        {
+          "type": "function",
+          "named": true
+        },
         {
           "type": "function_call",
           "named": true
@@ -213,10 +217,6 @@
         {
           "type": "index",
           "named": true
-        },
-        {
-          "type": "value",
-          "named": true
         }
       ]
     }
@@ -784,10 +784,6 @@
     "type": "float",
     "named": false
   },
-  {
-    "type": "fn",
-    "named": false
-  },
   {
     "type": "for",
     "named": false