python (3.12.0)

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       1  """
       2      pygments.modeline
       3      ~~~~~~~~~~~~~~~~~
       4  
       5      A simple modeline parser (based on pymodeline).
       6  
       7      :copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
       8      :license: BSD, see LICENSE for details.
       9  """
      10  
      11  import re
      12  
      13  __all__ = ['get_filetype_from_buffer']
      14  
      15  
      16  modeline_re = re.compile(r'''
      17      (?: vi | vim | ex ) (?: [<=>]? \d* )? :
      18      .* (?: ft | filetype | syn | syntax ) = ( [^:\s]+ )
      19  ''', re.VERBOSE)
      20  
      21  
      22  def get_filetype_from_line(l):
      23      m = modeline_re.search(l)
      24      if m:
      25          return m.group(1)
      26  
      27  
      28  def get_filetype_from_buffer(buf, max_lines=5):
      29      """
      30      Scan the buffer for modelines and return filetype if one is found.
      31      """
      32      lines = buf.splitlines()
      33      for l in lines[-1:-max_lines-1:-1]:
      34          ret = get_filetype_from_line(l)
      35          if ret:
      36              return ret
      37      for i in range(max_lines, -1, -1):
      38          if i < len(lines):
      39              ret = get_filetype_from_line(lines[i])
      40              if ret:
      41                  return ret
      42  
      43      return None