rails源码ActionView（待续）

不小心看到这里。

module ActionView
  class Base
    include Helpers, Partials, ::ERB::Util

    attr_reader :helpers

    class ProxyModule < Module
      def initialize(receiver)
        @receiver = receiver
      end

      def include(*args)
        super(*args)
        @receiver.extend(*args)
      end
    end

    def initialize(view_paths = [], assigns_for_first_render = {}, controller = nil)#:nodoc:
      @assigns = assigns_for_first_render
      @assigns_added = nil
      @controller = controller
      @helpers = ProxyModule.new(self)
      self.view_paths = view_paths

      @_first_render = nil
      @_current_render = nil
    end

  end
end

在Base里有一个ProxyModule < Module，然后在initialize方法里，调用@helpers = ProxyModule.new(self),实际上，是每一个Base的实例extend了Basem include的module

class CGI < SimpleDelegator
  # escape url encode
  def CGI::escape(str)
    str.gsub(/[^a-zA-Z0-9_\-.]/n){ sprintf("%%%02X", $&.unpack("C")[0]) }
  end

  # unescape url encoded
  def CGI::unescape(str)
    str.gsub(/\+/, ' ').gsub(/%([0-9a-fA-F]{2})/){ [$1.hex].pack("c") }
  end

  # escape HTML
  def CGI::escapeHTML(str)
    str.gsub(/&/, "&amp;").gsub(/\"/, "&quot;").gsub(/>/, "&gt;").gsub(/</, "&lt;")
  end
end

module ActionView
  module Helpers
    module JavaScriptHelper
      JS_ESCAPE_MAP = {
        '\\'    => '\\\\',
        '</'    => '<\/',
        "\r\n"  => '\n',
        "\n"    => '\n',
        "\r"    => '\n',
        '"'     => '\\"',
        "'"     => "\\'" }

      # Escape carrier returns and single and double quotes for JavaScript segments.
      def escape_javascript(javascript)
        if javascript
          javascript.gsub(/(\\|<\/|\r\n|[\n\r"'])/) { JS_ESCAPE_MAP[$1] }
        else
          ''
        end
      end
    end
  end
end