class IsoDoc::Iso::Xref

def annex_names(clause, num)
  appendix_names(clause, num)
  super
end

def annex_names1(clause, num, level)
  @anchors[clause["id"]] = { label: num, xref: num, level: level }
  clause.xpath(ns("./clause | ./references")).each_with_index do |c, i|
    annex_names1(c, "#{num}.#{i + 1}", level + 1)
  end
end

def appendix_names(clause, num)
  clause.xpath(ns("./appendix")).each_with_index do |c, i|
    @anchors[c["id"]] = anchor_struct(i + 1, nil, @labels["appendix"], "clause")
    @anchors[c["id"]][:level] = 2
    @anchors[c["id"]][:container] = clause["id"]
  end
end

def figure_anchor(t, sublabel, label)
  @anchors[t["id"]] = anchor_struct(
    (sublabel ? "#{label} #{sublabel}" : label),
    nil, @labels["figure"], "figure", t["unnumbered"])
  sublabel && t["unnumbered"] != "true" and
    @anchors[t["id"]][:label] = sublabel
end

def hierarchical_figure_names(clause, num)
  c = IsoDoc::XrefGen::Counter.new
  j = 0
  clause.xpath(ns(".//figure |  .//sourcecode[not(ancestor::example)]")).
    each do |t|
    j = subfigure_increment(j, c, t)
    label = "#{num}#{hiersep}#{c.print}"
    sublabel = j.zero? ? nil : "#{(j+96).chr})"
    next if t["id"].nil? || t["id"].empty?
    figure_anchor(t, sublabel, label)
  end
end

def hierarchical_formula_names(clause, num)
  c = IsoDoc::XrefGen::Counter.new
  clause.xpath(ns(".//formula")).each do |t|
    next if t["id"].nil? || t["id"].empty?
    @anchors[t["id"]] =
      anchor_struct("#{num}#{hiersep}#{c.increment(t).print}", t,
                    t["inequality"] ? @labels["inequality"] : @labels["formula"],
                    "formula", t["unnumbered"])
  end
end

def initial_anchor_names(d)
  super
  introduction_names(d.at(ns("//introduction")))
end

def introduction_names(clause)
  return if clause.nil?
  clause.at(ns("./clause")) and @anchors[clause["id"]] = 
    { label: "0", level: 1, xref: clause.at(ns("./title"))&.text, type: "clause" }
  clause.xpath(ns("./clause")).each_with_index do |c, i|
    section_names1(c, "0.#{i + 1}", 2)
  end
end

def parse(docxml)
  if @klass.amd(docxml)
    back_anchor_names(docxml)
    note_anchor_names(docxml.xpath(ns("//annex//table | //annex//figure")))
    note_anchor_names(docxml.xpath(ns("//annex")))
    example_anchor_names(docxml.xpath(ns("//annex")))
    list_anchor_names(docxml.xpath(ns("//annex")))
  else
    super
  end
end

def reference_names(ref)
  super
  @anchors[ref["id"]] = { xref: @anchors[ref["id"]][:xref].
                          sub(/ \(All Parts\)/i, "") }
end

def section_names1(clause, num, level)
  @anchors[clause["id"]] =
    { label: num, level: level, xref: num }
  # subclauses are not prefixed with "Clause"
  clause.xpath(ns("./clause | ./terms | ./term | ./definitions | "\
                  "./references")).
                 each_with_index do |c, i|
    section_names1(c, "#{num}.#{i + 1}", level + 1)
  end
end

def sequential_figure_names(clause)
  c = IsoDoc::XrefGen::Counter.new
  j = 0
  clause.xpath(ns(".//figure | .//sourcecode[not(ancestor::example)]")).
    each do |t|
    j = subfigure_increment(j, c, t)
    sublabel = j.zero? ? nil : "#{(j+96).chr})"
    next if t["id"].nil? || t["id"].empty?
    figure_anchor(t, sublabel, c.print)
  end
end