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# 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
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