class Metanorma::Utils::LineStatus

def initialize
  # process as passthrough: init = true until hit end of document header
  @pass = true
  @delim = false
  @pass_delim = false
  @delimln = ""
end

def process(line)
  text = line.rstrip
  text == "++++" && !@delimln and @pass = !@pass
  if @middoc_docattr && !/^:[^ :]+:($| )/.match?(text)
    @middoc_docattr = false
    @pass = false
  elsif (@is_delim && /^(--+|\*\*+|==+|__+)$/.match?(text)) ||
      (!@is_delim && !@delimln && /^-----*$|^\.\.\.\.\.*$|^\/\/\/\/\/*$/
    .match?(text))
    @delimln = text
    @pass = true
  elsif @pass_delim
    @pass = true
    @delimln = "" # end of paragraph for paragraph with [pass]
  elsif @delimln && text == @delimln
    @pass = false
    @delimln = nil
  elsif /^:[^ :]+:($| )/.match?(text) &&
      (@prev_line.empty? || @middoc_docattr)
    @pass = true
    @middoc_docattr = true
  end
  @is_delim = /^\[(source|listing|literal|pass|comment)\b/.match?(text)
  @pass_delim = /^\[(pass)\b/.match?(text)
  @prev_line = text.strip
end