class Liquid::Variable

def disabled?(_context)
  false
end

def disabled_tags
  []
end

def evaluate_filter_expressions(context, filter_args, filter_kwargs)
  parsed_args = filter_args.map { |expr| context.evaluate(expr) }
  if filter_kwargs
    parsed_kwargs = {}
    filter_kwargs.each do |key, expr|
      parsed_kwargs[key] = context.evaluate(expr)
    end
    parsed_args << parsed_kwargs
  end
  parsed_args
end

def initialize(markup, parse_context)
  @markup        = markup
  @name          = nil
  @parse_context = parse_context
  @line_number   = parse_context.line_number
  strict_parse_with_error_mode_fallback(markup)
end

def lax_parse(markup)
  @filters = []
  return unless markup =~ MarkupWithQuotedFragment
  name_markup   = Regexp.last_match(1)
  filter_markup = Regexp.last_match(2)
  @name         = parse_context.parse_expression(name_markup)
  if filter_markup =~ FilterMarkupRegex
    filters = Regexp.last_match(1).scan(FilterParser)
    filters.each do |f|
      next unless f =~ /\w+/
      filtername = Regexp.last_match(0)
      filterargs = f.scan(FilterArgsRegex).flatten
      @filters << parse_filter_expressions(filtername, filterargs)
    end
  end
end

def markup_context(markup)
  "in \"{{#{markup}}}\""
end

def parse_filter_expressions(filter_name, unparsed_args)
  filter_args  = []
  keyword_args = nil
  unparsed_args.each do |a|
    if (matches = a.match(JustTagAttributes))
      keyword_args           ||= {}
      keyword_args[matches[1]] = parse_context.parse_expression(matches[2])
    else
      filter_args << parse_context.parse_expression(a)
    end
  end
  result = [filter_name, filter_args]
  result << keyword_args if keyword_args
  result
end

def parse_filterargs(p)
  # first argument
  filterargs = [p.argument]
  # followed by comma separated others
  filterargs << p.argument while p.consume?(:comma)
  filterargs
end

def raw
  @markup
end

def render(context)
  obj = context.evaluate(@name)
  @filters.each do |filter_name, filter_args, filter_kwargs|
    filter_args = evaluate_filter_expressions(context, filter_args, filter_kwargs)
    obj = context.invoke(filter_name, obj, *filter_args)
  end
  context.apply_global_filter(obj)
end

def render_to_output_buffer(context, output)
  obj = render(context)
  if obj.is_a?(Array)
    output << obj.join
  elsif obj.nil?
  else
    output << obj.to_s
  end
  output
end

def strict_parse(markup)
  @filters = []
  p = Parser.new(markup)
  return if p.look(:end_of_string)
  @name = parse_context.parse_expression(p.expression)
  while p.consume?(:pipe)
    filtername = p.consume(:id)
    filterargs = p.consume?(:colon) ? parse_filterargs(p) : []
    @filters << parse_filter_expressions(filtername, filterargs)
  end
  p.consume(:end_of_string)
end