class Primer::Classify

:nodoc:

def call(args = {})


extract_css_attrs(classes: "d-flex", style: "float: left", mt: 4, py: 2) => { classes: "d-flex mt-4 py-2", style: "float: left" }
extract_css_attrs(classes: "d-flex", mt: 4, py: 2) => { classes: "d-flex mt-4 py-2", style: nil }
extract_css_attrs({ mt: 4, py: 2 }) => { classes: "mt-4 py-2", style: nil }
Example usage:


**args.
in **args. The :style entry is the value of the given :style entry given in
Primer CSS class names, including any classes given in the :classes entry
Returns a hash containing two entries. The :classes entry is a string of

and :style.
https://github.com/primer/components, as well as the special entries :classes
**args can contain utility keys that mimic the interface used by

Utility for mapping component configuration into Primer CSS class names. 
def call(args = {})
  style = nil
  classes = [].tap do |result|
    args.each do |key, val|
      case key
      when :classes
        # insert :classes first to avoid huge doc diffs
        if (class_names = validated_class_names(val))
          result.unshift(class_names)
        end
        next
      when :style
        style = val
        next
      end
      next unless LOOKUP[key]
      if val.is_a?(Array)
        # A while loop is ~3.5x faster than Array#each.
        brk = 0
        while brk < val.size
          item = val[brk]
          if item.nil?
            brk += 1
            next
          end
          # Believe it or not, three calls to Hash#[] and an inline rescue
          # are about 30% faster than Hash#dig. It also ensures validate is
          # only called when necessary, i.e. when the class can't be found
          # in the lookup table.
          found = (LOOKUP[key][item][brk] rescue nil) || validate(key, item, brk)
          # rubocop:enable Style/RescueModifier
          result << found if found
          brk += 1
        end
      else
        next if val.nil?
        # rubocop:disable Style/RescueModifier
        found = (LOOKUP[key][val][0] rescue nil) || validate(key, val, 0)
        # rubocop:enable Style/RescueModifier
        result << found if found
      end
    end
  end.join(" ")
  # This is much faster than Rails' presence method.
  {
    class: !classes || classes.empty? ? nil : classes,
    style: !style || style.empty? ? nil : style
  }
  # rubocop:enable Rails/Blank
end

def raise_on_invalid_options? 

def raise_on_invalid_options?
  Rails.application.config.primer_view_components.raise_on_invalid_options
end

def validate(key, val, brk) 

def validate(key, val, brk)
  brk_str = Primer::Classify::Utilities::BREAKPOINTS[brk]
  Primer::Classify::Utilities.validate(key, val, brk_str)
end

def validated_class_names(classes) 

def validated_class_names(classes)
  return if classes.blank?
  if raise_on_invalid_options? && !ENV["PRIMER_WARNINGS_DISABLED"]
    invalid_class_names =
      classes.split.each_with_object([]) do |class_name, memo|
        memo << class_name if Primer::Classify::Validation.invalid?(class_name)
      end
    if invalid_class_names.any?
      raise ArgumentError, "Use System Arguments (https://primer.style/view-components/system-arguments) "\
        "instead of Primer CSS class #{'name'.pluralize(invalid_class_names.length)} #{invalid_class_names.to_sentence}. "\
        "This warning will not be raised in production. Set PRIMER_WARNINGS_DISABLED=1 to disable this warning."
    end
  end
  classes
end