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<title>Data/List/PointedList/Circular.hs</title>
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<pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-conid'>PointedList</span><span class='hs-varop'>.</span><span class='hs-conid'>Circular</span>
<a name="line-2"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- Re-export many of the regular PointedList features</span>
<a name="line-3"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-conid'>PointedList</span>
<a name="line-4"></a>
<a name="line-5"></a> <span class='hs-comment'>-- And, of course, export the alternatives here</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>next</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>previous</span>
<a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>delete</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>deleteLeft</span>
<a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>deleteRight</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>moveN</span>
<a name="line-12"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-13"></a>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-conid'>PointedList</span>
<a name="line-15"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>PointedList</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>focus</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>singleton</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromList</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromListEnd</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>replace</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>insert</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>insertLeft</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>insertRight</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>deleteOthers</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>length</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>positions</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>contextMap</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>withFocus</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>find</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>index</span>
<a name="line-31"></a> <span class='hs-layout'>)</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-conid'>PointedList</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>PL</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="next"></a><span class='hs-comment'>-- | Move the focus to the next element in the list. If the last element is</span>
<a name="line-35"></a><span class='hs-comment'>-- currently focused, loop to the first element.</span>
<a name="line-36"></a><span class='hs-definition'>next</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span>
<a name="line-37"></a><span class='hs-definition'>next</span> <span class='hs-varid'>pl</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>b</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pl</span>
<a name="line-38"></a><span class='hs-definition'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>in</span>
<a name="line-39"></a> <span class='hs-conid'>PointedList</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>xs</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-40"></a><span class='hs-definition'>next</span> <span class='hs-varid'>pl</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PL</span><span class='hs-varop'>.</span><span class='hs-varid'>tryNext</span> <span class='hs-varid'>pl</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="previous"></a><span class='hs-comment'>-- | Move the focus to the previous element in the list. If the first element is</span>
<a name="line-43"></a><span class='hs-comment'>-- currently focused, loop to the last element.</span>
<a name="line-44"></a><span class='hs-definition'>previous</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span>
<a name="line-45"></a><span class='hs-definition'>previous</span> <span class='hs-varid'>pl</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>b</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pl</span>
<a name="line-46"></a><span class='hs-definition'>previous</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>in</span>
<a name="line-47"></a> <span class='hs-conid'>PointedList</span> <span class='hs-layout'>(</span><span class='hs-varid'>xs</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-conid'>[]</span>
<a name="line-48"></a><span class='hs-definition'>previous</span> <span class='hs-varid'>pl</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PL</span><span class='hs-varop'>.</span><span class='hs-varid'>tryPrevious</span> <span class='hs-varid'>pl</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="delete"></a><span class='hs-comment'>-- | An alias of 'deleteRight'.</span>
<a name="line-51"></a><span class='hs-definition'>delete</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-52"></a><span class='hs-definition'>delete</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>deleteRight</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="deleteLeft"></a><span class='hs-comment'>-- | Possibly delete the element at the focus, then move the element on the</span>
<a name="line-55"></a><span class='hs-comment'>-- left to the focus. If no element is on the left, focus on the element to</span>
<a name="line-56"></a><span class='hs-comment'>-- the right. If the deletion will cause the list to be empty, return</span>
<a name="line-57"></a><span class='hs-comment'>-- @Nothing@.</span>
<a name="line-58"></a><span class='hs-definition'>deleteLeft</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-59"></a><span class='hs-definition'>deleteLeft</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-60"></a><span class='hs-definition'>deleteLeft</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-conop'>:</span><span class='hs-varid'>ls</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>ls</span> <span class='hs-varid'>l</span> <span class='hs-varid'>rs</span>
<a name="line-61"></a><span class='hs-definition'>deleteLeft</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>rs</span> <span class='hs-keyword'>in</span>
<a name="line-62"></a> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>x</span> <span class='hs-conid'>[]</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="deleteRight"></a><span class='hs-comment'>-- | Possibly delete the element at the focus, then move the element on the</span>
<a name="line-65"></a><span class='hs-comment'>-- right to the focus. If no element is on the right, focus on the element to</span>
<a name="line-66"></a><span class='hs-comment'>-- the left. If the deletion will cause the list to be empty, return</span>
<a name="line-67"></a><span class='hs-comment'>-- @Nothing@.</span>
<a name="line-68"></a><span class='hs-definition'>deleteRight</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-69"></a><span class='hs-definition'>deleteRight</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-70"></a><span class='hs-definition'>deleteRight</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-varid'>ls</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>ls</span> <span class='hs-varid'>r</span> <span class='hs-varid'>rs</span>
<a name="line-71"></a><span class='hs-definition'>deleteRight</span> <span class='hs-layout'>(</span><span class='hs-conid'>PointedList</span> <span class='hs-varid'>ls</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>ls</span> <span class='hs-keyword'>in</span>
<a name="line-72"></a> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PointedList</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="moveN"></a><span class='hs-comment'>-- | Move</span>
<a name="line-75"></a><span class='hs-definition'>moveN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PointedList</span> <span class='hs-varid'>a</span>
<a name="line-76"></a><span class='hs-definition'>moveN</span> <span class='hs-num'>0</span> <span class='hs-varid'>pl</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pl</span>
<a name="line-77"></a><span class='hs-definition'>moveN</span> <span class='hs-varid'>n</span> <span class='hs-varid'>pl</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>></span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>moveN</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>next</span> <span class='hs-varid'>pl</span>
<a name="line-78"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>moveN</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>previous</span> <span class='hs-varid'>pl</span>
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