Merge pull request #79 from homura/custom-union-id

add custom union id in ebnf definition
nervosnetwork · Jan 8, 2024 · c03e59c · c03e59c
2 parents 3b277d8 + a6f3f96
commit c03e59c
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/docs/grammar/grammar.ebnf b/docs/grammar/grammar.ebnf
@@ -15,6 +15,7 @@ newline                 =   "\n" | "\r\n";
 
 identifier              =   letter, { letter | digit | "_" };
 number                  =   nonzero, { digit };
+number_greater_or_equal_than_zero = zero | { number };
 
 whitespace              =   ifs | newline;
 break                   =   whitespace, { whitespace };
@@ -29,15 +30,18 @@ item_decl               =   identifier, break_opt,
 field_decl              =   identifier, break_opt, ":", break_opt,
                             identifier, break_opt,
                             field_end;
+custom_union_item_decl  =   identifier, break_opt, ":", break_opt,
+                            number_greater_or_equal_than_zero, break_opt,
+                            field_end;
 option_decl             =   "option", break, identifier, break_opt,
                             "(", break_opt,
                                 identifier, break_opt,
                             ")", break_opt,
                             stmt_end;
 union_decl              =   "union", break, identifier, break_opt,
                             "{", break_opt,
-                                item_decl, break_opt,
-                                { item_decl, break_opt },
+                                (item_decl | custom_union_item_decl), break_opt,
+                                { (item_decl | custom_union_item_decl), break_opt },
                             "}";
 array_decl              =   "array", break, identifier, break_opt,
                             "[", break_opt,