json: fix arrays (disallow [,1])

examples/commit.txt

@@ -0,0 +1,10 @@
+- Adds support for `required` vs. optional properties, without the risk for repetitions.
+- Adds support for `additionalProperties`
+- Fixes handling of Arrays (`[ , 1]` no longer possible)
+- Fixes ordering: retain original order unless overridden (rather than alphabetical)
+- Add support for `$ref`
+
+https://github.com/vega/ts-json-schema-generator
+
+
+Before

examples/json-schema-to-grammar.py

@@ -90,18 +90,18 @@ class SchemaConverter:
             list_item_operator = f'("," space {item_rule_name})'
             successive_items = ""
             min_items = schema.get("minItems", 0)
+            max_items = schema.get("maxItems")
             if min_items > 0:
-               first_item = f"({item_rule_name})"
                 successive_items = list_item_operator * (min_items - 1)
                 min_items -= 1
-            else:
-               first_item = f"({item_rule_name})?"
-            max_items = schema.get("maxItems")
             if max_items is not None and max_items > min_items:
                 successive_items += (list_item_operator + "?") * (max_items - min_items - 1)
             else:
                 successive_items += list_item_operator + "*"
-            rule = f'"[" space {first_item} {successive_items} "]" space'
+            if min_items == 0:
+                rule = f'"[" space ({item_rule_name} {successive_items})? "]" space'
+            else:
+                rule = f'"[" space {item_rule_name} {successive_items} "]" space'
             return self._add_rule(rule_name, rule)
 
         else: