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# frozen_string_literal: true
module Temple
module HTML
# This filter removes empty attributes
# @api public
class AttributeRemover < Filter
define_options remove_empty_attrs: %w(id class)
def initialize(opts = {})
super
raise ArgumentError, "Option :remove_empty_attrs must be an Array of Strings" unless Array === options[:remove_empty_attrs] &&
options[:remove_empty_attrs].all? {|a| String === a }
end
def on_html_attrs(*attrs)
[:multi, *attrs.map {|attr| compile(attr) }]
end
def on_html_attr(name, value)
return super unless options[:remove_empty_attrs].include?(name.to_s)
if empty_exp?(value)
value
elsif contains_nonempty_static?(value)
[:html, :attr, name, value]
else
tmp = unique_name
[:multi,
[:capture, tmp, compile(value)],
[:if, "!#{tmp}.empty?",
[:html, :attr, name, [:dynamic, tmp]]]]
end
end
end
end
end
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