Method: RDoc::Parser::C#rb_scan_args

Defined in:
lib/rdoc/parser/c.rb

#rb_scan_args(method_body) ⇒ Object

Extracts parameters from the method_body and returns a method parameter string. Follows 1.9.3dev’s scan-arg-spec, see README.EXT



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# File 'lib/rdoc/parser/c.rb', line 1144

def rb_scan_args method_body
  method_body =~ /rb_scan_args\((.*?)\)/m
  return '(*args)' unless $1

  $1.split(/,/)[2] =~ /"(.*?)"/ # format argument
  format = $1.split(//)

  lead = opt = trail = 0

  if format.first =~ /\d/ then
    lead = $&.to_i
    format.shift
    if format.first =~ /\d/ then
      opt = $&.to_i
      format.shift
      if format.first =~ /\d/ then
        trail = $&.to_i
        format.shift
        block_arg = true
      end
    end
  end

  if format.first == '*' and not block_arg then
    var = true
    format.shift
    if format.first =~ /\d/ then
      trail = $&.to_i
      format.shift
    end
  end

  if format.first == ':' then
    hash = true
    format.shift
  end

  if format.first == '&' then
    block = true
    format.shift
  end

  # if the format string is not empty there's a bug in the C code, ignore it

  args = []
  position = 1

  (1...(position + lead)).each do |index|
    args << "p#{index}"
  end

  position += lead

  (position...(position + opt)).each do |index|
    args << "p#{index} = v#{index}"
  end

  position += opt

  if var then
    args << '*args'
    position += 1
  end

  (position...(position + trail)).each do |index|
    args << "p#{index}"
  end

  position += trail

  if hash then
    args << "p#{position} = {}"
  end

  args << '&block' if block

  "(#{args.join ', '})"
end