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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE PatternGuards #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE MultiParamTypeClasses #-}</span>
<a name="line-6"></a><span class='hs-cpp'>#ifndef MIN_VERSION_base</span>
<a name="line-7"></a><span class='hs-cpp'>#define MIN_VERSION_base(x,y,z) 1</span>
<a name="line-8"></a><span class='hs-cpp'>#endif</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-11"></a><span class='hs-comment'>-- |</span>
<a name="line-12"></a><span class='hs-comment'>-- Module : Control.Lens.Internal.Deque</span>
<a name="line-13"></a><span class='hs-comment'>-- Copyright : (C) 2012-15 Edward Kmett</span>
<a name="line-14"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-15"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-16"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-17"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-18"></a><span class='hs-comment'>--</span>
<a name="line-19"></a><span class='hs-comment'>-- This module is designed to be imported qualified.</span>
<a name="line-20"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-21"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Deque</span>
<a name="line-22"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Deque</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>size</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromList</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>null</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>singleton</span>
<a name="line-27"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Cons</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Fold</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Indexed</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'><.></span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Iso</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Prism</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-37"></a><span class='hs-cpp'>#if MIN_VERSION_base(4,8,0)</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Foldable</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>null</span><span class='hs-layout'>)</span>
<a name="line-39"></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'>Foldable</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Foldable</span>
<a name="line-40"></a><span class='hs-cpp'>#else</span>
<a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Foldable</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Foldable</span>
<a name="line-42"></a><span class='hs-cpp'>#endif</span>
<a name="line-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Function</span>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Functor</span><span class='hs-varop'>.</span><span class='hs-conid'>Bind</span>
<a name="line-45"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Functor</span><span class='hs-varop'>.</span><span class='hs-conid'>Plus</span>
<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Functor</span><span class='hs-varop'>.</span><span class='hs-conid'>Reverse</span>
<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Traversable</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Traversable</span>
<a name="line-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Semigroup</span>
<a name="line-49"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Profunctor</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>null</span><span class='hs-layout'>)</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="Deque"></a><span class='hs-comment'>-- | A Banker's deque based on Chris Okasaki's \"Purely Functional Data Structures\"</span>
<a name="line-53"></a><a name="Deque"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-54"></a> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Show</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="null"></a><span class='hs-comment'>-- | /O(1)/. Determine if a 'Deque' is 'empty'.</span>
<a name="line-57"></a><span class='hs-comment'>--</span>
<a name="line-58"></a><span class='hs-comment'>-- >>> null empty</span>
<a name="line-59"></a><span class='hs-comment'>-- True</span>
<a name="line-60"></a><span class='hs-comment'>--</span>
<a name="line-61"></a><span class='hs-comment'>-- >>> null (singleton 1)</span>
<a name="line-62"></a><span class='hs-comment'>-- False</span>
<a name="line-63"></a><span class='hs-definition'>null</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-64"></a><span class='hs-definition'>null</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>lr</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-65"></a><span class='hs-comment'>{-# INLINE null #-}</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="singleton"></a><span class='hs-comment'>-- | /O(1)/. Generate a singleton 'Deque'</span>
<a name="line-68"></a><span class='hs-comment'>--</span>
<a name="line-69"></a><span class='hs-comment'>-- >>> singleton 1</span>
<a name="line-70"></a><span class='hs-comment'>-- BD 1 [1] 0 []</span>
<a name="line-71"></a><span class='hs-definition'>singleton</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span>
<a name="line-72"></a><span class='hs-definition'>singleton</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span>
<a name="line-73"></a><span class='hs-comment'>{-# INLINE singleton #-}</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="size"></a><span class='hs-comment'>-- | /O(1)/. Calculate the size of a 'Deque'</span>
<a name="line-76"></a><span class='hs-comment'>--</span>
<a name="line-77"></a><span class='hs-comment'>-- >>> size (fromList [1,4,6])</span>
<a name="line-78"></a><span class='hs-comment'>-- 3</span>
<a name="line-79"></a><span class='hs-definition'>size</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-80"></a><span class='hs-definition'>size</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>lr</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span>
<a name="line-81"></a><span class='hs-comment'>{-# INLINE size #-}</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="fromList"></a><span class='hs-comment'>-- | /O(n)/ amortized. Construct a 'Deque' from a list of values.</span>
<a name="line-84"></a><span class='hs-comment'>--</span>
<a name="line-85"></a><span class='hs-comment'>-- >>> fromList [1,2]</span>
<a name="line-86"></a><span class='hs-comment'>-- BD 1 [1] 1 [2]</span>
<a name="line-87"></a><span class='hs-definition'>fromList</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span>
<a name="line-88"></a><span class='hs-definition'>fromList</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Prelude</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>empty</span>
<a name="line-89"></a><span class='hs-comment'>{-# INLINE fromList #-}</span>
<a name="line-90"></a>
<a name="line-91"></a><a name="instance%20Eq%20(Deque%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-92"></a> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span> <span class='hs-varop'>`on`</span> <span class='hs-varid'>toList</span>
<a name="line-93"></a> <span class='hs-comment'>{-# INLINE (==) #-}</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="instance%20Ord%20(Deque%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-96"></a> <span class='hs-varid'>compare</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>compare</span> <span class='hs-varop'>`on`</span> <span class='hs-varid'>toList</span>
<a name="line-97"></a> <span class='hs-comment'>{-# INLINE compare #-}</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="instance%20Functor%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-100"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>h</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>lr</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>h</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-101"></a> <span class='hs-comment'>{-# INLINE fmap #-}</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="instance%20FunctorWithIndex%20Int%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>FunctorWithIndex</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-104"></a> <span class='hs-varid'>imap</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-layout'>(</span><span class='hs-varid'>imap</span> <span class='hs-varid'>h</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>lr</span> <span class='hs-layout'>(</span><span class='hs-varid'>imap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>j</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-105"></a> <span class='hs-keyword'>where</span> <span class='hs-varop'>!</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="instance%20Apply%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Apply</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-108"></a> <span class='hs-varid'>fs</span> <span class='hs-varop'><.></span> <span class='hs-keyword'>as</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromList</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-varid'>fs</span> <span class='hs-varop'><.></span> <span class='hs-varid'>toList</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span>
<a name="line-109"></a> <span class='hs-comment'>{-# INLINE (<.>) #-}</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="instance%20Applicative%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Applicative</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-112"></a> <span class='hs-varid'>pure</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span>
<a name="line-113"></a> <span class='hs-comment'>{-# INLINE pure #-}</span>
<a name="line-114"></a> <span class='hs-varid'>fs</span> <span class='hs-varop'><*></span> <span class='hs-keyword'>as</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromList</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-varid'>fs</span> <span class='hs-varop'><*></span> <span class='hs-varid'>toList</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span>
<a name="line-115"></a> <span class='hs-comment'>{-# INLINE (<*>) #-}</span>
<a name="line-116"></a>
<a name="line-117"></a><a name="instance%20Alt%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Alt</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-118"></a> <span class='hs-varid'>xs</span> <span class='hs-varop'><!></span> <span class='hs-varid'>ys</span>
<a name="line-119"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>size</span> <span class='hs-varid'>xs</span> <span class='hs-varop'><</span> <span class='hs-varid'>size</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Foldable</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>ys</span> <span class='hs-varid'>xs</span>
<a name="line-120"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Foldable</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl</span> <span class='hs-varid'>snoc</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span>
<a name="line-121"></a> <span class='hs-comment'>{-# INLINE (<!>) #-}</span>
<a name="line-122"></a>
<a name="line-123"></a><a name="instance%20Plus%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Plus</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-124"></a> <span class='hs-varid'>zero</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span>
<a name="line-125"></a> <span class='hs-comment'>{-# INLINE zero #-}</span>
<a name="line-126"></a>
<a name="line-127"></a><a name="instance%20Alternative%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Alternative</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-128"></a> <span class='hs-varid'>empty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span>
<a name="line-129"></a> <span class='hs-comment'>{-# INLINE empty #-}</span>
<a name="line-130"></a> <span class='hs-varid'>xs</span> <span class='hs-varop'><|></span> <span class='hs-varid'>ys</span>
<a name="line-131"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>size</span> <span class='hs-varid'>xs</span> <span class='hs-varop'><</span> <span class='hs-varid'>size</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Foldable</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>ys</span> <span class='hs-varid'>xs</span>
<a name="line-132"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Foldable</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl</span> <span class='hs-varid'>snoc</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span>
<a name="line-133"></a> <span class='hs-comment'>{-# INLINE (<|>) #-}</span>
<a name="line-134"></a>
<a name="line-135"></a><a name="instance%20Reversing%20(Deque%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Reversing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-136"></a> <span class='hs-varid'>reversing</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span>
<a name="line-137"></a> <span class='hs-comment'>{-# INLINE reversing #-}</span>
<a name="line-138"></a>
<a name="line-139"></a><a name="instance%20Bind%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Bind</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-140"></a> <span class='hs-varid'>ma</span> <span class='hs-varop'>>>-</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromList</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-varid'>ma</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>toList</span> <span class='hs-varop'>.</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-141"></a> <span class='hs-comment'>{-# INLINE (>>-) #-}</span>
<a name="line-142"></a>
<a name="line-143"></a><a name="instance%20Monad%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-144"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span>
<a name="line-145"></a> <span class='hs-comment'>{-# INLINE return #-}</span>
<a name="line-146"></a> <span class='hs-varid'>ma</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromList</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-varid'>ma</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>toList</span> <span class='hs-varop'>.</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-147"></a> <span class='hs-comment'>{-# INLINE (>>=) #-}</span>
<a name="line-148"></a>
<a name="line-149"></a><a name="instance%20MonadPlus%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadPlus</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-150"></a> <span class='hs-varid'>mzero</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-151"></a> <span class='hs-comment'>{-# INLINE mzero #-}</span>
<a name="line-152"></a> <span class='hs-varid'>mplus</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span>
<a name="line-153"></a> <span class='hs-comment'>{-# INLINE mplus #-}</span>
<a name="line-154"></a>
<a name="line-155"></a><a name="instance%20Foldable%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Foldable</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-156"></a> <span class='hs-varid'>foldMap</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldMap</span> <span class='hs-varid'>h</span> <span class='hs-varid'>f</span> <span class='hs-varop'>`mappend`</span> <span class='hs-varid'>getDual</span> <span class='hs-layout'>(</span><span class='hs-varid'>foldMap</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dual</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-157"></a> <span class='hs-comment'>{-# INLINE foldMap #-}</span>
<a name="line-158"></a>
<a name="line-159"></a><a name="instance%20FoldableWithIndex%20Int%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>FoldableWithIndex</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-160"></a> <span class='hs-varid'>ifoldMap</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ifoldMap</span> <span class='hs-varid'>h</span> <span class='hs-varid'>f</span> <span class='hs-varop'>`mappend`</span> <span class='hs-varid'>getDual</span> <span class='hs-layout'>(</span><span class='hs-varid'>ifoldMap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>j</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dual</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-161"></a> <span class='hs-keyword'>where</span> <span class='hs-varop'>!</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span>
<a name="line-162"></a> <span class='hs-comment'>{-# INLINE ifoldMap #-}</span>
<a name="line-163"></a>
<a name="line-164"></a><a name="instance%20Traversable%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Traversable</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-165"></a> <span class='hs-varid'>traverse</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>??</span> <span class='hs-varid'>lr</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>h</span> <span class='hs-varid'>f</span> <span class='hs-varop'><*></span> <span class='hs-varid'>backwards</span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>h</span> <span class='hs-varid'>r</span>
<a name="line-166"></a> <span class='hs-comment'>{-# INLINE traverse #-}</span>
<a name="line-167"></a>
<a name="line-168"></a><a name="instance%20TraversableWithIndex%20Int%20Deque"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>TraversableWithIndex</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Deque</span> <span class='hs-keyword'>where</span>
<a name="line-169"></a> <span class='hs-varid'>itraverse</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>f'</span> <span class='hs-varid'>r'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BD</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>f'</span> <span class='hs-varid'>lr</span> <span class='hs-layout'>(</span><span class='hs-varid'>getReverse</span> <span class='hs-varid'>r'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>itraverse</span> <span class='hs-varid'>h</span> <span class='hs-varid'>f</span> <span class='hs-varop'><*></span> <span class='hs-varid'>itraverse</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>j</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Reverse</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-170"></a> <span class='hs-keyword'>where</span> <span class='hs-varop'>!</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span>
<a name="line-171"></a> <span class='hs-comment'>{-# INLINE itraverse #-}</span>
<a name="line-172"></a>
<a name="line-173"></a><a name="instance%20Semigroup%20(Deque%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Semigroup</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-174"></a> <span class='hs-varid'>xs</span> <span class='hs-varop'><></span> <span class='hs-varid'>ys</span>
<a name="line-175"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>size</span> <span class='hs-varid'>xs</span> <span class='hs-varop'><</span> <span class='hs-varid'>size</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Foldable</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>ys</span> <span class='hs-varid'>xs</span>
<a name="line-176"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Foldable</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl</span> <span class='hs-varid'>snoc</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span>
<a name="line-177"></a> <span class='hs-comment'>{-# INLINE (<>) #-}</span>
<a name="line-178"></a>
<a name="line-179"></a><a name="instance%20Monoid%20(Deque%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-180"></a> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span>
<a name="line-181"></a> <span class='hs-comment'>{-# INLINE mempty #-}</span>
<a name="line-182"></a> <span class='hs-varid'>mappend</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span>
<a name="line-183"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>size</span> <span class='hs-varid'>xs</span> <span class='hs-varop'><</span> <span class='hs-varid'>size</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Foldable</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>ys</span> <span class='hs-varid'>xs</span>
<a name="line-184"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Foldable</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl</span> <span class='hs-varid'>snoc</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span>
<a name="line-185"></a> <span class='hs-comment'>{-# INLINE mappend #-}</span>
<a name="line-186"></a>
<a name="line-187"></a><a name="check"></a><span class='hs-comment'>-- | Check that a 'Deque' satisfies the balance invariants and rebalance if not.</span>
<a name="line-188"></a><span class='hs-definition'>check</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span>
<a name="line-189"></a><span class='hs-definition'>check</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span>
<a name="line-190"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>></span> <span class='hs-num'>3</span><span class='hs-varop'>*</span><span class='hs-varid'>lr</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>div</span> <span class='hs-layout'>(</span><span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span><span class='hs-layout'>)</span> <span class='hs-num'>2</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>f'</span><span class='hs-layout'>,</span><span class='hs-varid'>f''</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>splitAt</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f'</span> <span class='hs-layout'>(</span><span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span> <span class='hs-comment'>-</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varop'>++</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>f''</span><span class='hs-layout'>)</span>
<a name="line-191"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lr</span> <span class='hs-varop'>></span> <span class='hs-num'>3</span><span class='hs-varop'>*</span><span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>div</span> <span class='hs-layout'>(</span><span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span><span class='hs-layout'>)</span> <span class='hs-num'>2</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>r'</span><span class='hs-layout'>,</span><span class='hs-varid'>r''</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>splitAt</span> <span class='hs-varid'>j</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-layout'>(</span><span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span> <span class='hs-comment'>-</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>++</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>r''</span><span class='hs-layout'>)</span> <span class='hs-varid'>j</span> <span class='hs-varid'>r'</span>
<a name="line-192"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span>
<a name="line-193"></a><span class='hs-comment'>{-# INLINE check #-}</span>
<a name="line-194"></a>
<a name="line-195"></a><a name="instance%20Cons%20(Deque%20a)%20(Deque%20b)%20a%20b"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Cons</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>where</span>
<a name="line-196"></a> <span class='hs-sel'>_Cons</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prism</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check</span> <span class='hs-layout'>(</span><span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-197"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-198"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>empty</span>
<a name="line-199"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>of</span>
<a name="line-200"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-201"></a> <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-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>check</span> <span class='hs-layout'>(</span><span class='hs-varid'>lf</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-202"></a> <span class='hs-comment'>{-# INLINE _Cons #-}</span>
<a name="line-203"></a>
<a name="line-204"></a><a name="instance%20Snoc%20(Deque%20a)%20(Deque%20b)%20a%20b"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Snoc</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deque</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>where</span>
<a name="line-205"></a> <span class='hs-sel'>_Snoc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prism</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>,</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>lr</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-conid'>BD</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-206"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>lf</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lr</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-207"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>empty</span>
<a name="line-208"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-209"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-varid'>head</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-210"></a> <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-layout'>(</span><span class='hs-varid'>check</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>lr</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-211"></a> <span class='hs-comment'>{-# INLINE _Snoc #-}</span>
</pre></body>
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