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Data-Sequence-Lens.html
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>src/Data/Sequence/Lens.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE Rank2Types #-}</span>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : Data.Sequence.Lens</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (C) 2012 Edward Kmett</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Sequence</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-14"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>ordinal</span><span class='hs-layout'>,</span> <span class='hs-varid'>viewL</span><span class='hs-layout'>,</span> <span class='hs-varid'>viewR</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>traverseHead</span><span class='hs-layout'>,</span> <span class='hs-varid'>traverseTail</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>traverseLast</span><span class='hs-layout'>,</span> <span class='hs-varid'>traverseInit</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>traverseTo</span><span class='hs-layout'>,</span> <span class='hs-varid'>traverseFrom</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>traverseSlice</span>
<a name="line-19"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></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-22"></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-keyword'>as</span> <span class='hs-conid'>Lens</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-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Sequence</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Seq</span>
<a name="line-25"></a>
<a name="line-26"></a><a name="ordinal"></a><span class='hs-comment'>-- | A 'Lens' that can access the @n@th element of a 'Seq'.</span>
<a name="line-27"></a><span class='hs-comment'>--</span>
<a name="line-28"></a><span class='hs-comment'>-- Note: This is only a legal lens if there is already such an element!</span>
<a name="line-29"></a><span class='hs-definition'>ordinal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SimpleIndexedLens</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-30"></a><span class='hs-definition'>ordinal</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>update</span> <span class='hs-varid'>i</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varid'>m</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-comment'>-- * Sequence isomorphisms</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="viewL"></a><span class='hs-comment'>-- | A 'Seq' is isomorphic to a 'ViewL'</span>
<a name="line-35"></a><span class='hs-comment'>--</span>
<a name="line-36"></a><span class='hs-comment'>-- @'viewl' m = m '^.' 'viewL'@</span>
<a name="line-37"></a><span class='hs-definition'>viewL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewL</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewL</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-definition'>viewL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isos</span> <span class='hs-varid'>viewl</span> <span class='hs-varid'>unviewl</span> <span class='hs-varid'>viewl</span> <span class='hs-varid'>unviewl</span> <span class='hs-keyword'>where</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="unviewl"></a><span class='hs-definition'>unviewl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ViewL</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span>
<a name="line-41"></a><span class='hs-definition'>unviewl</span> <span class='hs-conid'>EmptyL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span>
<a name="line-42"></a><span class='hs-definition'>unviewl</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-conop'>:<</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'><|</span> <span class='hs-keyword'>as</span>
<a name="line-43"></a><span class='hs-comment'>{-# INLINE viewL #-}</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="viewR"></a><span class='hs-comment'>-- | A 'Seq' is isomorphic to a 'ViewR'</span>
<a name="line-46"></a><span class='hs-comment'>--</span>
<a name="line-47"></a><span class='hs-comment'>-- @'viewr' m = m '^.' 'viewR'@</span>
<a name="line-48"></a><span class='hs-definition'>viewR</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewR</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewR</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-49"></a><span class='hs-definition'>viewR</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isos</span> <span class='hs-varid'>viewr</span> <span class='hs-varid'>unviewr</span> <span class='hs-varid'>viewr</span> <span class='hs-varid'>unviewr</span> <span class='hs-keyword'>where</span>
<a name="line-50"></a><span class='hs-comment'>{-# INLINE viewR #-}</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="unviewr"></a><span class='hs-definition'>unviewr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ViewR</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span>
<a name="line-53"></a><span class='hs-definition'>unviewr</span> <span class='hs-conid'>EmptyR</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span>
<a name="line-54"></a><span class='hs-definition'>unviewr</span> <span class='hs-layout'>(</span><span class='hs-keyword'>as</span> <span class='hs-conop'>:></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>as</span> <span class='hs-varop'>|></span> <span class='hs-varid'>a</span>
<a name="line-55"></a>
<a name="line-56"></a><span class='hs-comment'>-- * Traversals</span>
<a name="line-57"></a>
<a name="line-58"></a><a name="traverseHead"></a><span class='hs-comment'>-- | Traverse the head of a 'Seq'</span>
<a name="line-59"></a><span class='hs-definition'>traverseHead</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SimpleIndexedTraversal</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-60"></a><span class='hs-definition'>traverseHead</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>viewl</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-61"></a> <span class='hs-varid'>a</span> <span class='hs-conop'>:<</span> <span class='hs-keyword'>as</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varop'><|</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-keyglyph'>::</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-62"></a> <span class='hs-conid'>EmptyL</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pure</span> <span class='hs-varid'>m</span>
<a name="line-63"></a><span class='hs-comment'>{-# INLINE traverseHead #-}</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="traverseTail"></a><span class='hs-comment'>-- | Traverse the tail of a 'Seq'</span>
<a name="line-66"></a><span class='hs-definition'>traverseTail</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SimpleIndexedTraversal</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-67"></a><span class='hs-definition'>traverseTail</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>viewl</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-68"></a> <span class='hs-varid'>a</span> <span class='hs-conop'>:<</span> <span class='hs-keyword'>as</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'><|</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>itraverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</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-keyword'>as</span>
<a name="line-69"></a> <span class='hs-conid'>EmptyL</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pure</span> <span class='hs-varid'>m</span>
<a name="line-70"></a><span class='hs-comment'>{-# INLINE traverseTail #-}</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="traverseLast"></a><span class='hs-comment'>-- | Traverse the last element of a 'Seq'</span>
<a name="line-73"></a><span class='hs-definition'>traverseLast</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SimpleIndexedTraversal</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-74"></a><span class='hs-definition'>traverseLast</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>viewr</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-75"></a> <span class='hs-keyword'>as</span> <span class='hs-conop'>:></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyword'>as</span> <span class='hs-varop'>|></span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-76"></a> <span class='hs-conid'>EmptyR</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pure</span> <span class='hs-varid'>m</span>
<a name="line-77"></a><span class='hs-comment'>{-# INLINE traverseLast #-}</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="traverseInit"></a><span class='hs-comment'>-- | Traverse all but the last element of a 'Seq'</span>
<a name="line-80"></a><span class='hs-definition'>traverseInit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SimpleIndexedTraversal</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-81"></a><span class='hs-definition'>traverseInit</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>viewr</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-82"></a> <span class='hs-keyword'>as</span> <span class='hs-conop'>:></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varop'>|></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>itraverse</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>as</span>
<a name="line-83"></a> <span class='hs-conid'>EmptyR</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pure</span> <span class='hs-varid'>m</span>
<a name="line-84"></a><span class='hs-comment'>{-# INLINE traverseInit #-}</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="traverseTo"></a><span class='hs-comment'>-- | Traverse the first @n@ elements of a 'Seq'</span>
<a name="line-87"></a><span class='hs-definition'>traverseTo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SimpleIndexedTraversal</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-88"></a><span class='hs-definition'>traverseTo</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-89"></a> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varop'>><</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>itraverse</span> <span class='hs-varid'>f</span> <span class='hs-varid'>l</span>
<a name="line-90"></a><span class='hs-comment'>{-# INLINE traverseTo #-}</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="traverseFrom"></a><span class='hs-comment'>-- | Traverse all but the first @n@ elements of a 'Seq'</span>
<a name="line-93"></a><span class='hs-definition'>traverseFrom</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SimpleIndexedTraversal</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-94"></a><span class='hs-definition'>traverseFrom</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-95"></a> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varop'>><</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>itraverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-96"></a><span class='hs-comment'>{-# INLINE traverseFrom #-}</span>
<a name="line-97"></a>
<a name="line-98"></a><a name="traverseSlice"></a><span class='hs-comment'>-- | Travere all the elements numbered from @i@ to @j@ of a 'Seq'</span>
<a name="line-99"></a><span class='hs-definition'>traverseSlice</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SimpleIndexedTraversal</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-100"></a><span class='hs-definition'>traverseSlice</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>i</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-101"></a> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>mr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-comment'>-</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>mr</span> <span class='hs-keyword'>of</span>
<a name="line-102"></a> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varop'>><</span> <span class='hs-varid'>n</span> <span class='hs-varop'>><</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>itraverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-103"></a><span class='hs-comment'>{-# INLINE traverseSlice #-}</span>
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