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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 Rank2Types #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ < 708</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-7"></a><span class='hs-cpp'>#endif</span>
<a name="line-8"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-9"></a><span class='hs-comment'>-- |</span>
<a name="line-10"></a><span class='hs-comment'>-- Module : Control.Lens.Level</span>
<a name="line-11"></a><span class='hs-comment'>-- Copyright : (C) 2012-16 Edward Kmett</span>
<a name="line-12"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-13"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-14"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-15"></a><span class='hs-comment'>-- Portability : Rank2Types</span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a><span class='hs-comment'>-- This module provides combinators for breadth-first searching within</span>
<a name="line-18"></a><span class='hs-comment'>-- arbitrary traversals.</span>
<a name="line-19"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-20"></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'>Level</span>
<a name="line-21"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Level</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>levels</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ilevels</span>
<a name="line-24"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-25"></a>
<a name="line-26"></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-27"></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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Bazaar</span>
<a name="line-28"></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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Context</span>
<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'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Indexed</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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Level</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'>Traversal</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'>Type</span>
<a name="line-33"></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-34"></a>
<a name="line-35"></a><span class='hs-comment'>-- $setup</span>
<a name="line-36"></a><span class='hs-comment'>-- >>> :set -XNoOverloadedStrings</span>
<a name="line-37"></a><span class='hs-comment'>-- >>> import Control.Lens</span>
<a name="line-38"></a><span class='hs-comment'>-- >>> import Data.Char</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="levelIns"></a><span class='hs-definition'>levelIns</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BazaarT</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Level</span> <span class='hs-conid'>()</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-41"></a><span class='hs-definition'>levelIns</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-num'>0</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>getConst</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>bazaar</span> <span class='hs-layout'>(</span><span class='hs-varid'>rmapConst</span> <span class='hs-layout'>(</span><span class='hs-varid'>deepening</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-42"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>k</span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span> <span class='hs-varop'>`seq`</span> <span class='hs-varid'>runDeepening</span> <span class='hs-varid'>z</span> <span class='hs-varid'>k</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span>
<a name="line-43"></a> <span class='hs-varid'>xs</span> <span class='hs-conop'>:</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>go</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>k</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>z</span> <span class='hs-keyword'>else</span> <span class='hs-conid'>[]</span>
<a name="line-44"></a><span class='hs-comment'>{-# INLINE levelIns #-}</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="levelOuts"></a><span class='hs-definition'>levelOuts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BazaarT</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Level</span> <span class='hs-varid'>j</span> <span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-47"></a><span class='hs-definition'>levelOuts</span> <span class='hs-varid'>bz</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runFlows</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runBazaarT</span> <span class='hs-varid'>bz</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Flows</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>of</span>
<a name="line-48"></a> <span class='hs-conid'>One</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span> <span class='hs-conop'>:</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-49"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-str'>"levelOuts: wrong shape"</span>
<a name="line-50"></a><span class='hs-comment'>{-# INLINE levelOuts #-}</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="levels"></a><span class='hs-comment'>-- | This provides a breadth-first 'Traversal' or 'Fold' of the individual</span>
<a name="line-53"></a><span class='hs-comment'>-- 'levels' of any other 'Traversal' or 'Fold' via iterative deepening</span>
<a name="line-54"></a><span class='hs-comment'>-- depth-first search. The levels are returned to you in a compressed format.</span>
<a name="line-55"></a><span class='hs-comment'>--</span>
<a name="line-56"></a><span class='hs-comment'>-- This can permit us to extract the 'levels' directly:</span>
<a name="line-57"></a><span class='hs-comment'>--</span>
<a name="line-58"></a><span class='hs-comment'>-- >>> ["hello","world"]^..levels (traverse.traverse)</span>
<a name="line-59"></a><span class='hs-comment'>-- [Zero,Zero,One () 'h',Two 0 (One () 'e') (One () 'w'),Two 0 (One () 'l') (One () 'o'),Two 0 (One () 'l') (One () 'r'),Two 0 (One () 'o') (One () 'l'),One () 'd']</span>
<a name="line-60"></a><span class='hs-comment'>--</span>
<a name="line-61"></a><span class='hs-comment'>-- But we can also traverse them in turn:</span>
<a name="line-62"></a><span class='hs-comment'>--</span>
<a name="line-63"></a><span class='hs-comment'>-- >>> ["hello","world"]^..levels (traverse.traverse).traverse</span>
<a name="line-64"></a><span class='hs-comment'>-- "hewlolrold"</span>
<a name="line-65"></a><span class='hs-comment'>--</span>
<a name="line-66"></a><span class='hs-comment'>-- We can use this to traverse to a fixed depth in the tree of ('<*>') used in the 'Traversal':</span>
<a name="line-67"></a><span class='hs-comment'>--</span>
<a name="line-68"></a><span class='hs-comment'>-- >>> ["hello","world"] & taking 4 (levels (traverse.traverse)).traverse %~ toUpper</span>
<a name="line-69"></a><span class='hs-comment'>-- ["HEllo","World"]</span>
<a name="line-70"></a><span class='hs-comment'>--</span>
<a name="line-71"></a><span class='hs-comment'>-- Or we can use it to traverse the first @n@ elements in found in that 'Traversal' regardless of the depth</span>
<a name="line-72"></a><span class='hs-comment'>-- at which they were found.</span>
<a name="line-73"></a><span class='hs-comment'>--</span>
<a name="line-74"></a><span class='hs-comment'>-- >>> ["hello","world"] & taking 4 (levels (traverse.traverse).traverse) %~ toUpper</span>
<a name="line-75"></a><span class='hs-comment'>-- ["HELlo","World"]</span>
<a name="line-76"></a><span class='hs-comment'>--</span>
<a name="line-77"></a><span class='hs-comment'>-- The resulting 'Traversal' of the 'levels' which is indexed by the depth of each 'Level'.</span>
<a name="line-78"></a><span class='hs-comment'>--</span>
<a name="line-79"></a><span class='hs-comment'>-- >>> ["dog","cat"]^@..levels (traverse.traverse) <. traverse</span>
<a name="line-80"></a><span class='hs-comment'>-- [(2,'d'),(3,'o'),(3,'c'),(4,'g'),(4,'a'),(5,'t')]</span>
<a name="line-81"></a><span class='hs-comment'>--</span>
<a name="line-82"></a><span class='hs-comment'>-- @</span>
<a name="line-83"></a><span class='hs-comment'>-- 'levels' :: 'Traversal' s t a b -> 'IndexedTraversal' 'Int' s t ('Level' () a) ('Level' () b)</span>
<a name="line-84"></a><span class='hs-comment'>-- 'levels' :: 'Fold' s a -> 'IndexedFold' 'Int' s ('Level' () a)</span>
<a name="line-85"></a><span class='hs-comment'>-- @</span>
<a name="line-86"></a><span class='hs-comment'>--</span>
<a name="line-87"></a><span class='hs-comment'>-- /Note:/ Internally this is implemented by using an illegal 'Applicative', as it extracts information</span>
<a name="line-88"></a><span class='hs-comment'>-- in an order that violates the 'Applicative' laws.</span>
<a name="line-89"></a><span class='hs-definition'>levels</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>f</span>
<a name="line-90"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Traversing</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-91"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndexedLensLike</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-conid'>Level</span> <span class='hs-conid'>()</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Level</span> <span class='hs-conid'>()</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-92"></a><span class='hs-definition'>levels</span> <span class='hs-varid'>l</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>levelOuts</span> <span class='hs-varid'>bz</span> <span class='hs-varop'><$></span> <span class='hs-varid'>traversed</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>levelIns</span> <span class='hs-varid'>bz</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-93"></a> <span class='hs-varid'>bz</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varid'>sell</span> <span class='hs-varid'>s</span>
<a name="line-94"></a><span class='hs-comment'>{-# INLINE levels #-}</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="rmapConst"></a><span class='hs-comment'>-- This is only a temporary work around added to deal with a bug in an unreleased version</span>
<a name="line-97"></a><span class='hs-comment'>-- of GHC 7.10. We should remove it as soon as we're able.</span>
<a name="line-98"></a><span class='hs-definition'>rmapConst</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Profunctor</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>Const</span> <span class='hs-varid'>b</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-99"></a><span class='hs-definition'>rmapConst</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Const</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>p</span>
<a name="line-100"></a><span class='hs-comment'>{-# INLINE rmapConst #-}</span>
<a name="line-101"></a>
<a name="line-102"></a><a name="ilevelIns"></a><span class='hs-definition'>ilevelIns</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BazaarT</span> <span class='hs-layout'>(</span><span class='hs-conid'>Indexed</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Level</span> <span class='hs-varid'>i</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-103"></a><span class='hs-definition'>ilevelIns</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-num'>0</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>getConst</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>bazaar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Indexed</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>rmapConst</span> <span class='hs-layout'>(</span><span class='hs-varid'>deepening</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-104"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>k</span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span> <span class='hs-varop'>`seq`</span> <span class='hs-varid'>runDeepening</span> <span class='hs-varid'>z</span> <span class='hs-varid'>k</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span>
<a name="line-105"></a> <span class='hs-varid'>xs</span> <span class='hs-conop'>:</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>go</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>k</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>z</span> <span class='hs-keyword'>else</span> <span class='hs-conid'>[]</span>
<a name="line-106"></a><span class='hs-comment'>{-# INLINE ilevelIns #-}</span>
<a name="line-107"></a>
<a name="line-108"></a><a name="ilevelOuts"></a><span class='hs-definition'>ilevelOuts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BazaarT</span> <span class='hs-layout'>(</span><span class='hs-conid'>Indexed</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Level</span> <span class='hs-varid'>j</span> <span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-109"></a><span class='hs-definition'>ilevelOuts</span> <span class='hs-varid'>bz</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runFlows</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runBazaarT</span> <span class='hs-varid'>bz</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Indexed</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Flows</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>of</span>
<a name="line-110"></a> <span class='hs-conid'>One</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span> <span class='hs-conop'>:</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-111"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-str'>"ilevelOuts: wrong shape"</span>
<a name="line-112"></a><span class='hs-comment'>{-# INLINE ilevelOuts #-}</span>
<a name="line-113"></a>
<a name="line-114"></a><a name="ilevels"></a><span class='hs-comment'>-- | This provides a breadth-first 'Traversal' or 'Fold' of the individual</span>
<a name="line-115"></a><span class='hs-comment'>-- levels of any other 'Traversal' or 'Fold' via iterative deepening depth-first</span>
<a name="line-116"></a><span class='hs-comment'>-- search. The levels are returned to you in a compressed format.</span>
<a name="line-117"></a><span class='hs-comment'>--</span>
<a name="line-118"></a><span class='hs-comment'>-- This is similar to 'levels', but retains the index of the original 'IndexedTraversal', so you can</span>
<a name="line-119"></a><span class='hs-comment'>-- access it when traversing the levels later on.</span>
<a name="line-120"></a><span class='hs-comment'>--</span>
<a name="line-121"></a><span class='hs-comment'>-- >>> ["dog","cat"]^@..ilevels (traversed<.>traversed).itraversed</span>
<a name="line-122"></a><span class='hs-comment'>-- [((0,0),'d'),((0,1),'o'),((1,0),'c'),((0,2),'g'),((1,1),'a'),((1,2),'t')]</span>
<a name="line-123"></a><span class='hs-comment'>--</span>
<a name="line-124"></a><span class='hs-comment'>-- The resulting 'Traversal' of the levels which is indexed by the depth of each 'Level'.</span>
<a name="line-125"></a><span class='hs-comment'>--</span>
<a name="line-126"></a><span class='hs-comment'>-- >>> ["dog","cat"]^@..ilevels (traversed<.>traversed)<.>itraversed</span>
<a name="line-127"></a><span class='hs-comment'>-- [((2,(0,0)),'d'),((3,(0,1)),'o'),((3,(1,0)),'c'),((4,(0,2)),'g'),((4,(1,1)),'a'),((5,(1,2)),'t')]</span>
<a name="line-128"></a><span class='hs-comment'>--</span>
<a name="line-129"></a><span class='hs-comment'>-- @</span>
<a name="line-130"></a><span class='hs-comment'>-- 'ilevels' :: 'IndexedTraversal' i s t a b -> 'IndexedTraversal' 'Int' s t ('Level' i a) ('Level' i b)</span>
<a name="line-131"></a><span class='hs-comment'>-- 'ilevels' :: 'IndexedFold' i s a -> 'IndexedFold' 'Int' s ('Level' i a)</span>
<a name="line-132"></a><span class='hs-comment'>-- @</span>
<a name="line-133"></a><span class='hs-comment'>--</span>
<a name="line-134"></a><span class='hs-comment'>-- /Note:/ Internally this is implemented by using an illegal 'Applicative', as it extracts information</span>
<a name="line-135"></a><span class='hs-comment'>-- in an order that violates the 'Applicative' laws.</span>
<a name="line-136"></a><span class='hs-definition'>ilevels</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>f</span>
<a name="line-137"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Traversing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Indexed</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-138"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndexedLensLike</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-conid'>Level</span> <span class='hs-varid'>i</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Level</span> <span class='hs-varid'>j</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-139"></a><span class='hs-definition'>ilevels</span> <span class='hs-varid'>l</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ilevelOuts</span> <span class='hs-varid'>bz</span> <span class='hs-varop'><$></span> <span class='hs-varid'>traversed</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>ilevelIns</span> <span class='hs-varid'>bz</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-140"></a> <span class='hs-varid'>bz</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varid'>sell</span> <span class='hs-varid'>s</span>
<a name="line-141"></a><span class='hs-comment'>{-# INLINE ilevels #-}</span>
</pre></body>
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