lib/temple/html/attribute_merger.rb
# frozen_string_literal: true module Temple module HTML # This filter merges html attributes (e.g. used for id and class) # @api public class AttributeMerger < Filter define_options merge_attrs: {'id' => '_', 'class' => ' '} def on_html_attrs(*attrs) values = {} attrs.each do |_, _, name, value| name = name.to_s if values[name] raise(FilterError, "Multiple #{name} attributes specified") unless options[:merge_attrs][name] values[name] << value else values[name] = [value] end end attrs = values.map do |name, value| if (delimiter = options[:merge_attrs][name]) && value.size > 1 exp = [:multi] if value.all? {|v| contains_nonempty_static?(v) } exp << value.first value[1..-1].each {|v| exp << [:static, delimiter] << v } else captures = unique_name exp << [:code, "#{captures} = []"] value.each_with_index {|v, i| exp << [:capture, "#{captures}[#{i}]", v] } exp << [:dynamic, "#{captures}.reject(&:empty?).join(#{delimiter.inspect})"] end else exp = value.first end [:html, :attr, name, exp] end [:html, :attrs, *attrs] end end end end