code: def visitFunction(self, ctx: OverrideParser.FunctionContext) -> Any:
      args = []
      kwargs = {}
      children = ctx.getChildren()
      func_name = next(children).getText()
      popen = next(children)
      assert self.is_matching_terminal(popen, OverrideLexer.POPEN)
      in_kwargs = False
      while True:
          cur = next(children)
          if self.is_matching_terminal(cur, OverrideLexer.PCLOSE):
              break
  
          if isinstance(cur, OverrideParser.ArgNameContext):
              in_kwargs = True
              name = cur.getChild(0).getText()
              cur = next(children)
              value = self.visitElement(cur)
              kwargs[name] = value
          else:
              if self.is_matching_terminal(cur, OverrideLexer.COMMA):
                  continue
              if in_kwargs:
                  raise HydraException(
                      "positional argument follows keyword argument"
                  )
              value = self.visitElement(cur)
              args.append(value)
  
      function = FunctionCall(name=func_name, args=args, kwargs=kwargs)
      try:
          return self.functions.eval(function)
      except Exception as e:
          raise HydraException(
              f"{type(e).__name__} while evaluating '{ctx.getText()}': {e}"
          ) from e
  
imports: import sys
  import warnings
  from typing import Any, Dict, List, Optional, Tuple, Union
  from antlr4 import ParserRuleContext, TerminalNode, Token
  from antlr4.error.ErrorListener import ErrorListener
  from antlr4.tree.Tree import TerminalNodeImpl
  from hydra._internal.grammar.functions import FunctionCall, Functions
  from hydra._internal.grammar.utils import _ESC_QUOTED_STR
  from hydra.core.override_parser.types import ChoiceSweep, Glob, IntervalSweep, Key, Override, OverrideType, ParsedElementType, Quote, QuotedString, RangeSweep, ValueType
  from hydra.errors import HydraException
label_desc: Use image node_id 16 for calling the HydraOverrideVisitor obj's underlying member method code with example usage: obj.visitFunction(ctx) and returns: self