json: support tuple types ([number, string])

examples/json-schema-to-grammar.py

@@ -86,7 +86,17 @@ class SchemaConverter:
 
         elif schema_type == 'array' and 'items' in schema:
             # TODO `prefixItems` keyword
-            item_rule_name = self.visit(schema['items'], f'{name}{"-" if name else ""}item')
+            items = schema['items']
+            if isinstance(items, list):
+                return self._add_rule(
+                    rule_name,
+                    '"[" space ' +
+                    ' "," space '.join(
+                        self.visit(item, f'{name}-{i}')
+                        for i, item in enumerate(items)) +
+                    ' "]" space')
+            else:
+                item_rule_name = self.visit(items, f'{name}{"-" if name else ""}item')
                 list_item_operator = f'("," space {item_rule_name})'
                 successive_items = ""
                 min_items = schema.get("minItems", 0)
@@ -103,7 +113,6 @@ class SchemaConverter:
                 else:
                     rule = f'"[" space {item_rule_name} {successive_items} "]" space'
                 return self._add_rule(rule_name, rule)
-
         else:
             assert schema_type in PRIMITIVE_RULES, f'Unrecognized schema: {schema}'
             return self._add_rule(