Function _ParseValue

fire/core.py:959–988

Parses value, a string, into the appropriate type. The function used to parse value is determined by the remaining arguments. Args: value: The string value to be parsed, typically a command line argument. index: The index of the value in the function's argspec. arg: The name of the

(value, index, arg, metadata)

def _ParseValue(value, index, arg, metadata):
  """Parses value, a string, into the appropriate type.

  The function used to parse value is determined by the remaining arguments.

  Args:
    value: The string value to be parsed, typically a command line argument.
    index: The index of the value in the function's argspec.
    arg: The name of the argument the value is being parsed for.
    metadata: Metadata about the function, typically from Fire decorators.
  Returns:
    value, parsed into the appropriate type for calling a function.
  """
  parse_fn = parser.DefaultParseValue

  # We check to see if any parse function from the fn metadata applies here.
  parse_fns = metadata.get(decorators.FIRE_PARSE_FNS)
  if parse_fns:
    default = parse_fns['default']
    positional = parse_fns['positional']
    named = parse_fns['named']

    if index is not None and 0 <= index < len(positional):
      parse_fn = positional[index]
    elif arg in named:
      parse_fn = named[arg]
    elif default is not None:
      parse_fn = default

  return parse_fn(value)