module Erubis::SimplifyEnhancer

def self.desc   # :nodoc:
  "get convert faster but leave spaces around '<% %>'"
end

def convert(input)
  src = ""
  add_preamble(src)
  #regexp = pattern_regexp(@pattern)
  pos = 0
  input.scan(SIMPLE_REGEXP) do |indicator, code|
    match = Regexp.last_match
    index = match.begin(0)
    text  = input[pos, index - pos]
    pos   = match.end(0)
    add_text(src, text)
    if !indicator              # <% %>
      add_stmt(src, code)
    elsif indicator[0] == ?\#  # <%# %>
      n = code.count("\n")
      add_stmt(src, "\n" * n)
    else                       # <%= %>
      add_expr(src, code, indicator)
    end
  end
  #rest = $' || input                      # ruby1.8
  rest = pos == 0 ? input : input[pos..-1]  # ruby1.9
  add_text(src, rest)
  add_postamble(src)
  return src
end