Parslet::Atoms::Repetition

# File lib/parslet/atoms/repetition.rb, line 11
def initialize(parslet, min, max, tag=:repetition)
  super()

  @parslet = parslet
  @min, @max = min, max
  @tag = tag
  @error_msgs = {
    :minrep  => "Expected at least #{min} of #{parslet.inspect}"
  }
end

# File lib/parslet/atoms/visitor.rb, line 51
def accept(visitor)
  visitor.visit_repetition(@tag, min, max, parslet)
end

# File lib/parslet/atoms/repetition.rb, line 56
def to_s_inner(prec)
  minmax = "{#{min}, #{max}}"
  minmax = '?' if min == 0 && max == 1

  parslet.to_s(prec) + minmax
end

# File lib/parslet/atoms/repetition.rb, line 22
def try(source, context)
  occ = 0
  accum = [@tag]   # initialize the result array with the tag (for flattening)
  start_pos = source.pos
  
  break_on = nil
  loop do
    success, value = parslet.apply(source, context)

    break_on = value
    break unless success

    occ += 1
    accum << value
    
    # If we're not greedy (max is defined), check if that has been reached. 
    return succ(accum) if max && occ>=max
  end
  
  # Last attempt to match parslet was a failure, failure reason in break_on.
  
  # Greedy matcher has produced a failure. Check if occ (which will
  # contain the number of sucesses) is >= min.
  return context.err_at(
    self, 
    source, 
    @error_msgs[:minrep], 
    start_pos, 
    [break_on]) if occ < min
    
  return succ(accum)
end