Feb 15th 2023 update

external/graphqlparser/ast/ast.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+# Copyright 2019-present, GraphQL Foundation
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+from importlib import import_module
+
+def load_lang(lang):
+  return import_module(lang).Printer()
+
+
+def print_ast(lang_module, input_file):
+  lang_module.start_file()
+  line = input_file.readline()
+  while line:
+    line = line.strip()
+    if line.startswith('#') or not line:
+      line = input_file.readline()
+      continue
+
+    code, rest = line.split(None, 1)
+    if code[0] == 'T':
+      lang_module.start_type(rest)
+      field_line = input_file.readline().strip()
+      while field_line:
+        if field_line.startswith('#'):
+          field_line = input_file.readline().strip()
+          continue
+        field_kind, field_type, field_name = field_line.split()
+        nullable = len(field_kind) > 1 and field_kind[1] == '?'
+        if field_kind[0] == 'S':
+          plural = False
+        elif field_kind[0] == 'P':
+          plural = True
+        else:
+          raise Error('Unknown field kind: ' + field_kind)
+        lang_module.field(field_type, field_name, nullable, plural)
+        field_line = input_file.readline().strip()
+      lang_module.end_type(rest)
+    elif code[0] == 'U':
+      lang_module.start_union(rest)
+      field_line = input_file.readline().strip()
+      while field_line:
+        option_code, option_type = field_line.split()
+        if option_code != 'O':
+          raise Error('Unknown code in union: ' + option_code)
+        lang_module.union_option(option_type)
+        field_line = input_file.readline().strip()
+      lang_module.end_union(rest)
+    line = input_file.readline()
+
+  lang_module.end_file()
+if __name__ == '__main__':
+  import sys
+  lang = sys.argv[1]
+  filename = sys.argv[2]
+
+  lang_module = load_lang(lang)
+
+  print_ast(lang_module, open(filename, 'r'))