code: def _suite_or_file_input_is_valid(pgen_grammar, stack):
      if not _flows_finished(pgen_grammar, stack):
          return False
  
      for stack_node in reversed(stack):
          if stack_node.nonterminal == "decorator":
              # A decorator is only valid with the upcoming function.
              return False
  
          if stack_node.nonterminal == "suite":
              # If only newline is in the suite, the suite is not valid, yet.
              return len(stack_node.nodes) > 1
      # Not reaching a suite means that we're dealing with file_input levels
      # where there's no need for a valid statement in it. It can also be empty.
      return True
  
imports: import re
  import difflib
  from collections import namedtuple
  import logging
  from parso.utils import split_lines
  from parso.python.parser import Parser
  from parso.python.tree import EndMarker
  from parso.python.tokenize import PythonToken, BOM_UTF8_STRING
  from parso.python.token import PythonTokenTypes
label_desc: Use image node_id 14 for calling a global function with example usage: _suite_or_file_input_is_valid(pgen_grammar, stack) and returns: True, False, False, unknown