class_docstr: Convert keywords to lowercase or uppercase or capitalize them, which
  means first letter uppercase, rest lowercase.
  
  This can be useful e.g. if you highlight Pascal code and want to adapt the
  code to your styleguide.
  
  Options accepted:
  
  `case` : string
     The casing to convert keywords to. Must be one of ``'lower'``,
     ``'upper'`` or ``'capitalize'``.  The default is ``'lower'``.
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code: def __init__(self, **options):
      Filter.__init__(self, **options)
      case = get_choice_opt(
          options, "case", ["lower", "upper", "capitalize"], "lower"
      )
      self.convert = getattr(text_type, case)
  
imports: import re
  from pygments.token import String, Comment, Keyword, Name, Error, Whitespace, string_to_tokentype
  from pygments.filter import Filter
  from pygments.util import get_list_opt, get_int_opt, get_bool_opt, get_choice_opt, ClassNotFound, OptionError, text_type, string_types
  from pygments.plugin import find_plugin_filters
label_desc: Use image node_id 1 to create a new KeywordCaseFilter object from inherited base classes: Filter with example: obj = KeywordCaseFilter()