class_docstr: Lexer for `YAML <http://yaml.org/>`_, a human-friendly data serialization
  language.
  
  .. versionadded:: 0.11
docstr: Process indentation spaces in a plain scalar.
docstr_tok: ["Process","indentation","spaces","in","a","plain","scalar","."]
code: def parse_plain_scalar_indent(token_class):
      """Process indentation spaces in a plain scalar."""
  
      def callback(lexer, match, context):
          text = match.group()
          if len(text) <= context.indent:
              context.stack.pop()
              context.stack.pop()
              return
          if text:
              yield match.start(), token_class, text
              context.pos = match.end()
  
      return callback
  
imports: import re
  from pygments.lexer import RegexLexer, ExtendedRegexLexer, LexerContext, include, bygroups, inherit
  from pygments.token import Text, Comment, Keyword, Name, String, Number, Punctuation, Literal, Error
label_desc: Use image node_id 8 for calling the YamlLexer obj's underlying member method code with example usage: obj.parse_plain_scalar_indent(token_class) and returns: callback