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<title>src/Data/Tree/Lens.hs</title>
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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 FlexibleContexts #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-cpp'>#ifndef MIN_VERSION_base</span>
<a name="line-5"></a><span class='hs-cpp'>#define MIN_VERSION_base(x,y,z) 1</span>
<a name="line-6"></a><span class='hs-cpp'>#endif</span>
<a name="line-7"></a>
<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 : Data.Tree.Lens</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 : MTPCs</span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Tree</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-20"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>root</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>branches</span>
<a name="line-22"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Tree</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-cpp'>#if !MIN_VERSION_base(4,8,0)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Functor</span>
<a name="line-29"></a><span class='hs-cpp'>#endif</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="root"></a><span class='hs-comment'>-- | A 'Lens' that focuses on the root of a 'Tree'.</span>
<a name="line-32"></a><span class='hs-comment'>--</span>
<a name="line-33"></a><span class='hs-comment'>-- >>> view root $ Node 42 []</span>
<a name="line-34"></a><span class='hs-comment'>-- 42</span>
<a name="line-35"></a><span class='hs-definition'>root</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Tree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-36"></a><span class='hs-definition'>root</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Node</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>`Node`</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span>
<a name="line-37"></a><span class='hs-comment'>{-# INLINE root #-}</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="branches"></a><span class='hs-comment'>-- | A 'Lens' returning the direct descendants of the root of a 'Tree'</span>
<a name="line-40"></a><span class='hs-comment'>--</span>
<a name="line-41"></a><span class='hs-comment'>-- @'view' 'branches' ≡ 'subForest'@</span>
<a name="line-42"></a><span class='hs-definition'>branches</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Tree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Tree</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-43"></a><span class='hs-definition'>branches</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Node</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Node</span> <span class='hs-varid'>a</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-keyword'>as</span>
<a name="line-44"></a><span class='hs-comment'>{-# INLINE branches #-}</span>
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