# File lib/www/mechanize/history.rb, line 8
 8:       def initialize(max_size = nil)
 9:         @max_size       = max_size
10:         @history_index  = {}
11:       end

    # File lib/www/mechanize/history.rb, line 38
38:       def clear
39:         @history_index.clear
40:         super
41:       end

    # File lib/www/mechanize/history.rb, line 13
13:       def initialize_copy(orig)
14:         super
15:         @history_index = orig.instance_variable_get(:@history_index).dup
16:       end

    # File lib/www/mechanize/history.rb, line 52
52:       def pop
53:         return nil if length == 0
54:         page = super
55:         remove_from_index(page)
56:         page
57:       end

    # File lib/www/mechanize/history.rb, line 18
18:       def push(page, uri = nil)
19:         super(page)
20:         @history_index[(uri ? uri : page.uri).to_s] = page
21:         if @max_size && self.length > @max_size
22:           while self.length > @max_size
23:             self.shift
24:           end
25:         end
26:         self
27:       end

    # File lib/www/mechanize/history.rb, line 43
43:       def shift
44:         return nil if length == 0
45:         page    = self[0]
46:         self[0] = nil
47:         super
48:         remove_from_index(page)
49:         page
50:       end

    # File lib/www/mechanize/history.rb, line 30
30:       def visited?(url)
31:         ! visited_page(url).nil?
32:       end

    # File lib/www/mechanize/history.rb, line 34
34:       def visited_page(url)
35:         @history_index[(url.respond_to?(:uri) ? url.uri : url).to_s]
36:       end

    # File lib/www/mechanize/history.rb, line 60
60:       def remove_from_index(page)
61:         @history_index.each do |k,v|
62:           @history_index.delete(k) if v == page
63:         end
64:       end