class ReverseMarkdown::Converters::Text

def convert(node, options = {})
  if node.text.strip.empty?
    treat_empty(node)
  else
    treat_text(node)
  end
end

def preserve_keychars_within_backticks(text)
  text.gsub(/`.*?`/) do |match|
    match.gsub('\_', '_').gsub('\*', '*')
  end
end

def preserve_nbsp(text)
  text.gsub(/\u00A0/, " ")
end

def preserve_tags(text)
  text.gsub(/[<>]/, '>' => '\>', '<' => '\<')
end

def remove_border_newlines(text)
  text.gsub(/\A\n+/, '').gsub(/\n+\z/, '')
end

def remove_inner_newlines(text)
  text.tr("\r\n\t", ' ').squeeze(' ')
end

def treat_empty(node)
  parent = node.parent.name.to_sym
  if [:ol, :ul].include?(parent)  # Otherwise the identation is broken
    ''
  elsif node.text == ' '          # Regular whitespace text node
    ' '
  else
    ''
  end
end

def treat_text(node)
  text = node.text
  text = preserve_nbsp(text)
  text = remove_border_newlines(text)
  text = remove_inner_newlines(text)
  text = escape_keychars(text)
  text = preserve_keychars_within_backticks(text)
  text = preserve_tags(text)
  text
end