parser: allow functions without parameters

Fixes #55
usagi-coffee · Sep 4, 2024 · 15a4858 · 15a4858
1 parent 2d35336
commit 15a4858
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/grammar.js b/grammar.js
@@ -455,7 +455,7 @@ module.exports = grammar({
           choice(kw("RETURNS"), kw("RETURN")),
           field("return_type", choice($.primitive_type, $.identifier))
         ),
-        seq("(", optional(_list($.function_parameter, ",")), ")"),
+        optional(seq("(", optional(_list($.function_parameter, ",")), ")")),
         choice(":", $._terminator),
         optional($.body),
         $._function_terminator

diff --git a/test/corpus/basic.txt b/test/corpus/basic.txt
@@ -767,6 +767,10 @@ FUNCTION fn-no-mode RETURNS INTEGER (par1 AS INTEGER).
   RETURN par1.
 END.
 
+FUNCTION fn-no-parameters RETURNS INTEGER:
+  RETURN 0.
+END.
+
 fn(INPUT somepar, OUTPUT otherpar).
 fn-no-mode(somerpar).
 fn-no-mode(somerpar) NO-ERROR.
@@ -799,6 +803,12 @@ PersonData:GetById(id, output table ttPerson by-reference).
     (body
       (return_statement
         (identifier))))
+  (function_statement
+    name: (identifier)
+    return_type: (primitive_type)
+    (body
+      (return_statement
+        (number_literal))))
   (function_call_statement
     (function_call
       function: (identifier)