Trying out a thing

experiments/tree-sitter-test/grammar.js

@@ -6,9 +6,33 @@ module.exports = grammar({
         _definition: $ => choice(
             $.function_definition
             //TODO others
-        )
+        ),
 
+        function_definition: $ => seq(
+            "fn",
+            $.identifier,
+            $.parameter_list,
+            $._type,
+            $.block,
+        ),
+        parameter_list: $ => seq("(", /* TODO */ ")"),
 
+        block: $ => seq(
+            "{",
+            repeat($._statement),
+            "}"
+        ),
 
+        _statement: $ => choice(
+            $._return_statement
+        ),
+
+        _return_statement: $ => seq("return", $._expression, ";"),
+
+        _expression: $ => choice($.identifier),
+
+        _type: $ => "bool",
+
+        identifier: $ => /[a-z]+/,
     }
 });

experiments/tree-sitter-test/test/corpus/test.txt

@@ -7,3 +7,13 @@ hello
 ----
 
 (source_file)
+
+
+=====
+Another
+====
+
+fn main() { }
+
+------
+()