doc/classes/Game.src/M000038.html

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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">&gt;</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">&lt;&lt;</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>
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