module Premailer::Adapter

Manages the adapter classes. Currently supports:

Constants

REQUIREMENT_MAP

adapter to required file mapping.

Public Class Methods

default() click to toggle source

The default adapter based on what you currently have loaded and installed. First checks to see if any adapters are already loaded, then checks to see which are installed if none are loaded. @raise [RuntimeError] unless suitable adapter found.

# File lib/premailer/adapter.rb, line 30
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 RuntimeError.new("No suitable adapter for Premailer was found, please install hpricot or nokogiri")
end
find(adapter) click to toggle source

Returns an adapter. @raise [ArgumentError] unless the adapter exists.

# File lib/premailer/adapter.rb, line 54
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() click to toggle source

Returns the adapter to use.

# File lib/premailer/adapter.rb, line 20
def self.use
  return @use if @use
  self.use = self.default
  @use
end
use=(new_adapter) click to toggle source

Sets the adapter to use. @raise [ArgumentError] unless the adapter exists.

# File lib/premailer/adapter.rb, line 48
def self.use=(new_adapter)
  @use = find(new_adapter)
end