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8 <title>undo_move! (Game)
</title>
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13 <pre><span class=
"ruby-comment cmt"># File lib/libttc.rb, line
445</span>
14 <span class=
"ruby-keyword kw">def
</span> <span class=
"ruby-identifier">undo_move!
</span>
15 <span class=
"ruby-keyword kw">if
</span> <span class=
"ruby-ivar">@history
</span>.
<span class=
"ruby-identifier">length
</span> <span class=
"ruby-operator">></span> <span class=
"ruby-value">1</span>
16 <span class=
"ruby-comment cmt"># general case
</span>
17 <span class=
"ruby-identifier">state_to_restore
</span> =
<span class=
"ruby-ivar">@history
</span>[
<span class=
"ruby-value">-
2</span>]
18 <span class=
"ruby-ivar">@current_player
</span> =
<span class=
"ruby-ivar">@history
</span>[
<span class=
"ruby-value">-
1</span>].
<span class=
"ruby-identifier">player
</span>
19 <span class=
"ruby-ivar">@pieces
</span>.
<span class=
"ruby-identifier">each
</span> <span class=
"ruby-keyword kw">do
</span> <span class=
"ruby-operator">|
</span><span class=
"ruby-identifier">name
</span>,
<span class=
"ruby-identifier">piece
</span><span class=
"ruby-operator">|
</span>
20 <span class=
"ruby-identifier">copy_piece
</span> =
<span class=
"ruby-identifier">state_to_restore
</span>.
<span class=
"ruby-identifier">pieces_after_move
</span>[
<span class=
"ruby-identifier">name
</span>]
21 <span class=
"ruby-identifier">piece
</span>.
<span class=
"ruby-identifier">position
</span> =
<span class=
"ruby-identifier">copy_piece
</span>.
<span class=
"ruby-identifier">position
</span>
22 <span class=
"ruby-identifier">piece
</span>.
<span class=
"ruby-identifier">captured
</span> =
<span class=
"ruby-identifier">copy_piece
</span>.
<span class=
"ruby-identifier">captured
</span>
23 <span class=
"ruby-identifier">piece
</span>.
<span class=
"ruby-identifier">contains
</span> = []
24 <span class=
"ruby-identifier">copy_piece
</span>.
<span class=
"ruby-identifier">contains
</span>.
<span class=
"ruby-identifier">each
</span> <span class=
"ruby-keyword kw">do
</span> <span class=
"ruby-operator">|
</span><span class=
"ruby-identifier">p
</span><span class=
"ruby-operator">|
</span>
25 <span class=
"ruby-comment cmt"># piece.capture(@pieces[p.name])
</span>
26 <span class=
"ruby-identifier">piece
</span>.
<span class=
"ruby-identifier">contains
</span> <span class=
"ruby-operator"><<</span> <span class=
"ruby-ivar">@pieces
</span>[
<span class=
"ruby-identifier">p
</span>.
<span class=
"ruby-identifier">name
</span>]
27 <span class=
"ruby-keyword kw">end
</span>
28 <span class=
"ruby-keyword kw">end
</span>
29 <span class=
"ruby-ivar">@history
</span>.
<span class=
"ruby-identifier">pop
</span>
30 <span class=
"ruby-keyword kw">elsif
</span> <span class=
"ruby-ivar">@history
</span>.
<span class=
"ruby-identifier">length
</span> <span class=
"ruby-operator">==
</span> <span class=
"ruby-value">1</span>
31 <span class=
"ruby-comment cmt"># reset to start
</span>
32 <span class=
"ruby-ivar">@current_player
</span> =
<span class=
"ruby-value str">'a'
</span>
33 <span class=
"ruby-ivar">@pieces
</span>.
<span class=
"ruby-identifier">each
</span> <span class=
"ruby-keyword kw">do
</span> <span class=
"ruby-operator">|
</span><span class=
"ruby-identifier">name
</span>,
<span class=
"ruby-identifier">piece
</span><span class=
"ruby-operator">|
</span>
34 <span class=
"ruby-identifier">piece
</span>.
<span class=
"ruby-identifier">position
</span> =
<span class=
"ruby-ivar">@board
</span>.
<span class=
"ruby-identifier">positions
</span>[
<span class=
"ruby-identifier">piece
</span>.
<span class=
"ruby-identifier">colour
</span>]
35 <span class=
"ruby-identifier">piece
</span>.
<span class=
"ruby-identifier">captured
</span> =
<span class=
"ruby-keyword kw">false
</span>
36 <span class=
"ruby-identifier">piece
</span>.
<span class=
"ruby-identifier">contains
</span> = []
37 <span class=
"ruby-keyword kw">end
</span>
38 <span class=
"ruby-ivar">@history
</span>.
<span class=
"ruby-identifier">pop
</span>
39 <span class=
"ruby-keyword kw">end
</span>
40 <span class=
"ruby-keyword kw">end
</span></pre>