def GetTemplateArgs()

in build-support/cpplint.py [0:0]

• 43 lines of code
• 15 McCabe index (conditional complexity)

def GetTemplateArgs(clean_lines, linenum):
  """Find list of template arguments associated with this function declaration.

  Args:
    clean_lines: A CleansedLines instance containing the file.
    linenum: Line number containing the start of the function declaration,
             usually one line after the end of the template-argument-list.
  Returns:
    Set of type names, or empty set if this does not appear to have
    any template parameters.
  """
  # Find start of function
  func_line = linenum
  while func_line > 0:
    line = clean_lines.elided[func_line]
    if Match(r'^\s*$', line):
      return set()
    if line.find('(') >= 0:
      break
    func_line -= 1
  if func_line == 0:
    return set()

  # Collapse template-argument-list into a single string
  argument_list = ''
  match = Match(r'^(\s*template\s*)<', clean_lines.elided[func_line])
  if match:
    # template-argument-list on the same line as function name
    start_col = len(match.group(1))
    _, end_line, end_col = CloseExpression(clean_lines, func_line, start_col)
    if end_col > -1 and end_line == func_line:
      start_col += 1  # Skip the opening bracket
      argument_list = clean_lines.elided[func_line][start_col:end_col]

  elif func_line > 1:
    # template-argument-list one line before function name
    match = Match(r'^(.*)>\s*$', clean_lines.elided[func_line - 1])
    if match:
      end_col = len(match.group(1))
      _, start_line, start_col = ReverseCloseExpression(
          clean_lines, func_line - 1, end_col)
      if start_col > -1:
        start_col += 1  # Skip the opening bracket
        while start_line < func_line - 1:
          argument_list += clean_lines.elided[start_line][start_col:]
          start_col = 0
          start_line += 1
        argument_list += clean_lines.elided[func_line - 1][start_col:end_col]

  if not argument_list:
    return set()

  # Extract type names
  typenames = set()
  while True:
    match = Match(r'^[,\s]*(?:typename|class)(?:\.\.\.)?\s+(\w+)(.*)$',
                  argument_list)
    if not match:
      break
    typenames.add(match.group(1))
    argument_list = match.group(2)
  return typenames