class BindingDemo
  def initialize
    @ivar = "wombat in instance variable"
  end
  def get_binding(param)
    lvar = "cat in local variable"
    binding
  end
end

b = BindingDemo.new

the_binding = b.get_binding("dog in paramater") { "elk in block" }

puts(eval("@ivar", the_binding))
puts(eval("lvar", the_binding))
puts(eval("param", the_binding))
puts(eval("yield", the_binding))

eval("lvar = 'new value'", the_binding)
puts(eval("lvar", the_binding))

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str = 'id=138313, store_id=40, sku=, url=http://www.shopping.hp.com/webapp/shopping/computer_can_series.do?storeName=computer_store&category=notebooks&a1=Usage&v1=Entertainment&series_name=dv6700tse_series, price=899.99, has_unidentified_coupon=1, title=HP Pavilion dv6700t Special Edition 15.4" Laptop: Core 2 Duo 2.4GHz,'

  str_hash = "{'id' => '138313','sku' => '','price => '899.99'}"

   hash = eval(str_hash)

 price = hash['price']

 
    info = str.gsub(/(\w+)=([^,]*)(?=\s*,)/,'\'\1\'=>\'\2\'')
    hash = eval("{#{info}}")
    title   = hash['title']
 

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class A
  end
  module M
  end

 A = Class.new
 M = Module.new

class A 
  @instance_vairable = 5 
end

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def seo_title
    case @seo_obj
    when "latest"
      return "latest coupon codes - #{SITE_NAME}"
    when "featured"
      return "featured coupon codes - #{SITE_NAME}"
    when "stores"
      return "coupon code of thousands of stores - #{SITE_NAME}"
    when "tags"
      return "tags coupons - #{SITE_NAME}"
    else
      if @seo_obj.kind_of?(Merchant)
           ....
        if @seo_obj.html_title && !(@seo_obj.html_title.blank?)
          ....
        elsif @seo_obj.printable == YES
          #printable
               ...
        else
                ....
        end
      elsif @seo_obj.kind_of?(Tag)

      else
       ...
      end
    end
  end

   def seo_keywords
    case @seo_obj
       ...
     end
     ...
   end

  Seo_Title = {'sodeal.index' => "hot deal 50% of",
    'sodeal.merchant_deals' => "IBM Deal,HP Deal,merchant  ?1, coupon  ?2",
    'index.merchants' => 'hot deals and coupons for many online stores'
    }
   Seo_Desc ={...}
   Seo_Keywords = {...}

def index_merchants_seo
    merchant_name = instance_eval {@merchant.merchant_name}
    coupon_name = instance_eval{@coupon.name}
    seo_title = Seo_Title["#{params[:controller]}.#{params[:action]}"]
    seo_title.gsub('?1',merchant_name).gsub('?2',coupon_name)
    set_seo_title seo_title
  end
  
  def default_seo
    set_seo_title Seo_Title["#{params[:controller]}.#{params[:action]}"]
    set_seo_desc Seo_Description["#{params[:controller]}.#{params[:action]}"]
    set_seo_keywords Seo_Keywords["#{params[:controller]}.#{params[:action]}"]
  end
  
  private
  def set_seo_title(title)
    instance_eval { @seo_title = title}
  end
  def set_seo_keywords(keywords)
     instance_eval { @seo_keywords = keywords}
  end
  def set_seo_desc(desc)
    instance_eval { @seo_desc = desc}
  end

def seo
    if respond_to?("#{params[:controller_name]}_#{params[:action]}_seo".to_sym)
       send("#{params[:action]}_seo") 
    else
      default_seo
    end
  end  

module Seo
  
  def self.included(helper)
    
  end
  
  Seo_Title = {'sodeal.index' => "hot deal 50% of",
    'sodeal.merchant_deals' => "IBM Deal,HP Deal,merchant  ?1, coupon  ?2",
    'index.merchants' => 'hot deals and coupons for many online stores'
    }
  
  Seo_Description = {'sodeal.index' => 'index desc'}
  Seo_Keywords = {'sodeal.index' => 'index keywords'}
  
  protected

  #later can add contoller_name here
  def seo
    if respond_to?("#{params[:controller_name]}_#{params[:action]}_seo".to_sym)
       send("#{params[:action]}_seo") 
    else
      default_seo
    end
  end  
   
  def index_merchants_seo
    merchant_name = instance_eval {@merchant.merchant_name}
    coupon_name = instance_eval{@coupon.name}
    seo_title = "24*7 hot deals and coupons for ?1".gsub('?1',merchant_name)
    seo_title = Seo_Title["#{params[:controller]}.#{params[:action]}"].gsub('?1',merchant_name).gsub('?2',coupon_name)
    set_seo_title seo_title
  end
  
  def default_seo
    set_seo_title Seo_Title["#{params[:controller]}.#{params[:action]}"]
    set_seo_desc Seo_Description["#{params[:controller]}.#{params[:action]}"]
    set_seo_keywords Seo_Keywords["#{params[:controller]}.#{params[:action]}"]
  end
  
  private
  def set_seo_title(title)
    instance_eval { @seo_title = title}
  end
  def set_seo_keywords(keywords)
     instance_eval { @seo_keywords = keywords}
  end
  def set_seo_desc(desc)
    instance_eval { @seo_desc = desc}
  end
end

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/2001/REC-xhtml11-20010531/DTD/xhtml11-flat.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<% seo %>
<title><%= @seo_title %></title>
<meta http-equiv="Content-Language" content="en-gb" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<META content="<%= @seo_desc %>" name="description">
<META content="<%= @seo_keywords %>" name="keywords">

• 北京: 千橡集团暨校内网诚聘软件研发工程师
• 搜狐网站诚聘Java、PHP和C++工程师

• 搜狐网站诚聘Java、PHP和C++工程师
• 北京: 千橡集团暨校内网诚聘软件研发工程师

• 搜狐网站诚聘Java、PHP和C++工程师
• 北京: 千橡集团暨校内网诚聘软件研发工程师