Class: CompEx::Style

Inherits:
Object
  • Object
show all
Defined in:
lib/compex/style.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass, source, root_classes = nil) ⇒ Style 



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# File 'lib/compex/style.rb', line 12

def initialize(klass, source, root_classes = nil)
  @style = source
  @ast = MiniCSS.parse(@style)
  @root_classes = root_classes || []
  @component_prefix = klass.descriptor.css_prefix
end

Class Method Details

.compile(component_class, source, root_classes = nil) ⇒ Object 



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# File 'lib/compex/style.rb', line 8

def self.compile(component_class, source, root_classes = nil)
  new(component_class, source, root_classes).compile
end

Instance Method Details

#compile ⇒ Object 



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# File 'lib/compex/style.rb', line 19

def compile
  @ast.each do |v|
    case v
    when MiniCSS::AST::Rule
      next unless v.valid_selector?

      v.selector = prefix_selector(v.selector)
    when MiniCSS::AST::AtRule
      next unless %w[media supports].include?(v.name)

      v.child_rules = v.child_rules.map do |rule|
        next rule unless rule.is_a? MiniCSS::AST::Rule
        next rule unless rule.valid_selector?

        rule.selector = prefix_selector(rule.selector)
        rule
      end
    else
      raise "Unexpected AST element #{v}"
    end
  end
  MiniCSS.serialize(@ast)
end

#prefix_selector(sel) ⇒ Object 



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# File 'lib/compex/style.rb', line 43

def prefix_selector(sel)
  case sel[:type]
  when :class
    {
      type: :complex,
      combinator: @root_classes.include?(sel[:content].gsub(/^\./, "")) ? "" : " ",
      left: { type: :class, content: ".#{@component_prefix}" },
      right: sel
    }

  when :type, :attribute, :universal, :id
    {
      type: :complex,
      combinator: " ",
      left: { type: :class, content: ".#{@component_prefix}" },
      right: sel
    }

  when :list
    sel.tap do |s|
      s[:list].map! { prefix_selector(it) }
    end

  when :complex
    sel.tap do |s|
      s[:left] = prefix_selector(s[:left])
    end

  when :compound
    sel.tap do |s|
      s[:list][0] = prefix_selector(s[:list].first)
    end

  else
    raise "Unexpected selector type #{sel[:type]}"
  end
end