parameters: (self, source)
docstring: Initialize a source.
  
      Args:
        source: str, The JavaScript source.
docstring_summary: Initialize a source.
docstring_tokens: Initialize a source .
function: def __init__(self, source):
      """Initialize a source.
  
      Args:
        source: str, The JavaScript source.
      """
  
      self.provides = set()
      self.requires = set()
  
      self._source = source
      self._ScanSource()
function_tokens: def __init__ ( self , source ) : self . provides = set ( ) self . requires = set ( ) self . _source = source self . _ScanSource ( )