Module: Premailer::Adapter

Defined in:
lib/premailer/adapter.rb,
lib/premailer/adapter/hpricot.rb,
lib/premailer/adapter/nokogiri.rb

Defined Under Namespace

Modules: Hpricot, Nokogiri

Constant Summary collapse

REQUIREMENT_MAP = 
[
  ["hpricot",  :hpricot],
  ["nokogiri", :nokogiri],
]

Class Method Summary collapse

Class Method Details

.default ⇒ Object

The default adapter based on what you currently have loaded and installed. First checks to see if any adapters are already loaded, then ckecks to see which are installed if none are loaded.



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# File 'lib/premailer/adapter.rb', line 28

def self.default
  return :hpricot  if defined?(::Hpricot)
  return :nokogiri if defined?(::Nokogiri)

  REQUIREMENT_MAP.each do |(library, adapter)|
    begin
      require library
      return adapter
    rescue LoadError
      next
    end
  end

  raise "No suitable adapter for Premailer was found, please install hpricot or nokogiri"
end

.find(adapter) ⇒ Object

Returns an adapter. Raises an ArgumentError unless the adapter exists.



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# File 'lib/premailer/adapter.rb', line 50

def self.find(adapter)
  return adapter if adapter.is_a?(Module)

  Premailer::Adapter.const_get("#{adapter.to_s.split('_').map{|s| s.capitalize}.join('')}")
rescue NameError
  raise ArgumentError, "Invalid adapter: #{adapter}"
end

.use ⇒ Object

Returns the adapter to use.



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# File 'lib/premailer/adapter.rb', line 19

def self.use
  return @use if @use
  self.use = self.default
  @use
end

.use=(new_adapter) ⇒ Object

Sets the adapter to use. Raises an ArgumentError unless the adapter exists.



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# File 'lib/premailer/adapter.rb', line 45

def self.use=(new_adapter)
  @use = find(new_adapter)
end