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<title>src/Control/Lens/TH.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 PatternGuards #-}</span>
<a name="line-3"></a><span class='hs-cpp'>#ifdef TRUSTWORTHY</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-5"></a><span class='hs-cpp'>#endif</span>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-cpp'>#ifndef MIN_VERSION_base</span>
<a name="line-8"></a><span class='hs-cpp'>#define MIN_VERSION_base(x,y,z) 1</span>
<a name="line-9"></a><span class='hs-cpp'>#endif</span>
<a name="line-10"></a>
<a name="line-11"></a><span class='hs-cpp'>#ifndef MIN_VERSION_template_haskell</span>
<a name="line-12"></a><span class='hs-cpp'>#define MIN_VERSION_template_haskell(x,y,z) (defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 706)</span>
<a name="line-13"></a><span class='hs-cpp'>#endif</span>
<a name="line-14"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-15"></a><span class='hs-comment'>-- |</span>
<a name="line-16"></a><span class='hs-comment'>-- Module : Control.Lens.TH</span>
<a name="line-17"></a><span class='hs-comment'>-- Copyright : (C) 2012-15 Edward Kmett, 2012-13 Michael Sloan</span>
<a name="line-18"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-19"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-20"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-21"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-22"></a><span class='hs-comment'>--</span>
<a name="line-23"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-24"></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'>TH</span>
<a name="line-25"></a> <span class='hs-layout'>(</span>
<a name="line-26"></a> <span class='hs-comment'>-- * Constructing Lenses Automatically</span>
<a name="line-27"></a> <span class='hs-varid'>makeLenses</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeLensesFor</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeClassy</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeClassyFor</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeClassy_</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makePrisms</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeClassyPrisms</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeWrapped</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeFields</span>
<a name="line-33"></a> <span class='hs-comment'>-- * Constructing Lenses Given a Declaration Quote</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>declareLenses</span><span class='hs-layout'>,</span> <span class='hs-varid'>declareLensesFor</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>declareClassy</span><span class='hs-layout'>,</span> <span class='hs-varid'>declareClassyFor</span>
<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>declarePrisms</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>declareWrapped</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>declareFields</span>
<a name="line-39"></a> <span class='hs-comment'>-- * Configuring Lenses</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeLensesWith</span>
<a name="line-41"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>declareLensesWith</span>
<a name="line-42"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>defaultFieldRules</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>camelCaseFields</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>underscoreFields</span>
<a name="line-45"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>abbreviatedFields</span>
<a name="line-46"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>LensRules</span>
<a name="line-47"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DefName</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lensRules</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lensRulesFor</span>
<a name="line-50"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>classyRules</span>
<a name="line-51"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>classyRules_</span>
<a name="line-52"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lensField</span>
<a name="line-53"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lensClass</span>
<a name="line-54"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>simpleLenses</span>
<a name="line-55"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>createClass</span>
<a name="line-56"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>generateSignatures</span>
<a name="line-57"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>generateUpdateableOptics</span>
<a name="line-58"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>generateLazyPatterns</span>
<a name="line-59"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-60"></a>
<a name="line-61"></a><span class='hs-cpp'>#if !MIN_VERSION_base(4,8,0)</span>
<a name="line-62"></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-63"></a><span class='hs-cpp'>#endif</span>
<a name="line-64"></a><span class='hs-cpp'>#if !(MIN_VERSION_template_haskell(2,7,0))</span>
<a name="line-65"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>ap</span><span class='hs-layout'>)</span>
<a name="line-66"></a><span class='hs-cpp'>#endif</span>
<a name="line-67"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Trans</span>
<a name="line-68"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span>
<a name="line-69"></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-70"></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'>Getter</span>
<a name="line-71"></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-72"></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'>Setter</span>
<a name="line-73"></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'>Tuple</span>
<a name="line-74"></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-75"></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'>TH</span>
<a name="line-76"></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'>FieldTH</span>
<a name="line-77"></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'>PrismTH</span>
<a name="line-78"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>toLower</span><span class='hs-layout'>,</span> <span class='hs-varid'>isUpper</span><span class='hs-layout'>)</span>
<a name="line-79"></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'>concat</span><span class='hs-layout'>,</span> <span class='hs-varid'>any</span><span class='hs-layout'>)</span>
<a name="line-80"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>List</span>
<a name="line-81"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Map</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span><span class='hs-layout'>,</span><span class='hs-varid'>map</span><span class='hs-layout'>,</span><span class='hs-varid'>filter</span><span class='hs-layout'>)</span>
<a name="line-82"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>maybeToList</span><span class='hs-layout'>)</span>
<a name="line-83"></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-84"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Set</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span><span class='hs-layout'>,</span><span class='hs-varid'>map</span><span class='hs-layout'>,</span><span class='hs-varid'>filter</span><span class='hs-layout'>)</span>
<a name="line-85"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-86"></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-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>mapM</span><span class='hs-layout'>)</span>
<a name="line-87"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>TH</span>
<a name="line-88"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>TH</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-89"></a>
<a name="line-90"></a><span class='hs-cpp'>#ifdef HLINT</span>
<a name="line-91"></a><span class='hs-comment'>{-# ANN module "HLint: ignore Eta reduce" #-}</span>
<a name="line-92"></a><span class='hs-comment'>{-# ANN module "HLint: ignore Use fewer imports" #-}</span>
<a name="line-93"></a><span class='hs-comment'>{-# ANN module "HLint: ignore Use foldl" #-}</span>
<a name="line-94"></a><span class='hs-cpp'>#endif</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="simpleLenses"></a><span class='hs-comment'>-- | Generate "simple" optics even when type-changing optics are possible.</span>
<a name="line-97"></a><span class='hs-comment'>-- (e.g. 'Lens'' instead of 'Lens')</span>
<a name="line-98"></a><span class='hs-definition'>simpleLenses</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>LensRules</span> <span class='hs-conid'>Bool</span>
<a name="line-99"></a><span class='hs-definition'>simpleLenses</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_simpleLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span><span class='hs-layout'>}</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-sel'>_simpleLenses</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-100"></a>
<a name="line-101"></a><a name="generateSignatures"></a><span class='hs-comment'>-- | Indicate whether or not to supply the signatures for the generated</span>
<a name="line-102"></a><span class='hs-comment'>-- lenses.</span>
<a name="line-103"></a><span class='hs-comment'>--</span>
<a name="line-104"></a><span class='hs-comment'>-- Disabling this can be useful if you want to provide a more restricted type</span>
<a name="line-105"></a><span class='hs-comment'>-- signature or if you want to supply hand-written haddocks.</span>
<a name="line-106"></a><span class='hs-definition'>generateSignatures</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>LensRules</span> <span class='hs-conid'>Bool</span>
<a name="line-107"></a><span class='hs-definition'>generateSignatures</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span>
<a name="line-108"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_generateSigs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span><span class='hs-layout'>}</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-sel'>_generateSigs</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-109"></a>
<a name="line-110"></a><a name="generateUpdateableOptics"></a><span class='hs-comment'>-- | Generate "updateable" optics when 'True'. When 'False', 'Fold's will be</span>
<a name="line-111"></a><span class='hs-comment'>-- generated instead of 'Traversal's and 'Getter's will be generated instead</span>
<a name="line-112"></a><span class='hs-comment'>-- of 'Lens'es. This mode is intended to be used for types with invariants</span>
<a name="line-113"></a><span class='hs-comment'>-- which must be maintained by "smart" constructors.</span>
<a name="line-114"></a><span class='hs-definition'>generateUpdateableOptics</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>LensRules</span> <span class='hs-conid'>Bool</span>
<a name="line-115"></a><span class='hs-definition'>generateUpdateableOptics</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span>
<a name="line-116"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_allowUpdates</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span><span class='hs-layout'>}</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-sel'>_allowUpdates</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="generateLazyPatterns"></a><span class='hs-comment'>-- | Generate optics using lazy pattern matches. This can</span>
<a name="line-119"></a><span class='hs-comment'>-- allow fields of an undefined value to be initialized with lenses:</span>
<a name="line-120"></a><span class='hs-comment'>--</span>
<a name="line-121"></a><span class='hs-comment'>-- @</span>
<a name="line-122"></a><span class='hs-comment'>-- data Foo = Foo {_x :: Int, _y :: Bool}</span>
<a name="line-123"></a><span class='hs-comment'>-- deriving Show</span>
<a name="line-124"></a><span class='hs-comment'>--</span>
<a name="line-125"></a><span class='hs-comment'>-- 'makeLensesWith' ('lensRules' & 'generateLazyPatterns' .~ True) ''Foo</span>
<a name="line-126"></a><span class='hs-comment'>-- @</span>
<a name="line-127"></a><span class='hs-comment'>--</span>
<a name="line-128"></a><span class='hs-comment'>-- @</span>
<a name="line-129"></a><span class='hs-comment'>-- > undefined & x .~ 8 & y .~ True</span>
<a name="line-130"></a><span class='hs-comment'>-- Foo {_x = 8, _y = True}</span>
<a name="line-131"></a><span class='hs-comment'>-- @</span>
<a name="line-132"></a><span class='hs-comment'>-- </span>
<a name="line-133"></a><span class='hs-comment'>-- The downside of this flag is that it can lead to space-leaks and</span>
<a name="line-134"></a><span class='hs-comment'>-- code-size/compile-time increases when generated for large records. By</span>
<a name="line-135"></a><span class='hs-comment'>-- default this flag is turned off, and strict optics are generated.</span>
<a name="line-136"></a><span class='hs-comment'>--</span>
<a name="line-137"></a><span class='hs-comment'>-- When using lazy optics the strict optic can be recovered by composing</span>
<a name="line-138"></a><span class='hs-comment'>-- with '$!':</span>
<a name="line-139"></a><span class='hs-comment'>--</span>
<a name="line-140"></a><span class='hs-comment'>-- @</span>
<a name="line-141"></a><span class='hs-comment'>-- strictOptic = ($!) . lazyOptic</span>
<a name="line-142"></a><span class='hs-comment'>-- @</span>
<a name="line-143"></a><span class='hs-definition'>generateLazyPatterns</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>LensRules</span> <span class='hs-conid'>Bool</span>
<a name="line-144"></a><span class='hs-definition'>generateLazyPatterns</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span>
<a name="line-145"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_lazyPatterns</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span><span class='hs-layout'>}</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-sel'>_lazyPatterns</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-146"></a>
<a name="line-147"></a><a name="createClass"></a><span class='hs-comment'>-- | Create the class if the constructor is 'Control.Lens.Type.Simple' and the</span>
<a name="line-148"></a><span class='hs-comment'>-- 'lensClass' rule matches.</span>
<a name="line-149"></a><span class='hs-definition'>createClass</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>LensRules</span> <span class='hs-conid'>Bool</span>
<a name="line-150"></a><span class='hs-definition'>createClass</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span>
<a name="line-151"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_generateClasses</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span><span class='hs-layout'>}</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-sel'>_generateClasses</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-152"></a>
<a name="line-153"></a><a name="lensField"></a><span class='hs-comment'>-- | 'Lens'' to access the convention for naming fields in our 'LensRules'.</span>
<a name="line-154"></a><span class='hs-comment'>--</span>
<a name="line-155"></a><span class='hs-comment'>-- Defaults to stripping the _ off of the field name, lowercasing the name, and</span>
<a name="line-156"></a><span class='hs-comment'>-- skipping the field if it doesn't start with an '_'. The field naming rule</span>
<a name="line-157"></a><span class='hs-comment'>-- provides the names of all fields in the type as well as the current field.</span>
<a name="line-158"></a><span class='hs-comment'>-- This extra generality enables field naming conventions that depend on the</span>
<a name="line-159"></a><span class='hs-comment'>-- full set of names in a type.</span>
<a name="line-160"></a><span class='hs-comment'>--</span>
<a name="line-161"></a><span class='hs-comment'>-- The field naming rule has access to the type name, the names of all the field</span>
<a name="line-162"></a><span class='hs-comment'>-- of that type (including the field being named), and the name of the field</span>
<a name="line-163"></a><span class='hs-comment'>-- being named.</span>
<a name="line-164"></a><span class='hs-comment'>--</span>
<a name="line-165"></a><span class='hs-comment'>-- TypeName -> FieldNames -> FieldName -> DefinitionNames</span>
<a name="line-166"></a><span class='hs-definition'>lensField</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>LensRules</span> <span class='hs-layout'>(</span><span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-167"></a><span class='hs-definition'>lensField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_fieldToDef</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span><span class='hs-layout'>}</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-sel'>_fieldToDef</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-168"></a>
<a name="line-169"></a><a name="lensClass"></a><span class='hs-comment'>-- | Retrieve options such as the name of the class and method to put in it to</span>
<a name="line-170"></a><span class='hs-comment'>-- build a class around monomorphic data types. "Classy" lenses are generated</span>
<a name="line-171"></a><span class='hs-comment'>-- when this naming convention is provided.</span>
<a name="line-172"></a><span class='hs-comment'>-- TypeName -> Maybe (ClassName, MainMethodName)</span>
<a name="line-173"></a><span class='hs-definition'>lensClass</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>LensRules</span> <span class='hs-layout'>(</span><span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Name</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-174"></a><span class='hs-definition'>lensClass</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_classyLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-layout'>}</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-sel'>_classyLenses</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-175"></a>
<a name="line-176"></a><a name="lensRules"></a><span class='hs-comment'>-- | Rules for making fairly simple partial lenses, ignoring the special cases</span>
<a name="line-177"></a><span class='hs-comment'>-- for isomorphisms and traversals, and not making any classes.</span>
<a name="line-178"></a><span class='hs-definition'>lensRules</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span>
<a name="line-179"></a><span class='hs-definition'>lensRules</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LensRules</span>
<a name="line-180"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_simpleLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-181"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateSigs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-182"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateClasses</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-183"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_allowIsos</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-184"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_allowUpdates</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-185"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_lazyPatterns</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-186"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_classyLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>const</span> <span class='hs-conid'>Nothing</span>
<a name="line-187"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_fieldToDef</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span>
<a name="line-188"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>nameBase</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>of</span>
<a name="line-189"></a> <span class='hs-chr'>'_'</span><span class='hs-conop'>:</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TopName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-layout'>(</span><span class='hs-varid'>toLower</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-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-190"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-191"></a> <span class='hs-layout'>}</span>
<a name="line-192"></a>
<a name="line-193"></a><a name="lensRulesFor"></a><span class='hs-comment'>-- | Construct a 'LensRules' value for generating top-level definitions</span>
<a name="line-194"></a><span class='hs-comment'>-- using the given map from field names to definition names.</span>
<a name="line-195"></a><span class='hs-definition'>lensRulesFor</span> <span class='hs-keyglyph'>::</span>
<a name="line-196"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>{- ^ [(Field Name, Definition Name)] -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-197"></a> <span class='hs-conid'>LensRules</span>
<a name="line-198"></a><span class='hs-definition'>lensRulesFor</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lensRules</span> <span class='hs-varop'>&</span> <span class='hs-varid'>lensField</span> <span class='hs-varop'>.~</span> <span class='hs-varid'>mkNameLookup</span> <span class='hs-varid'>fields</span>
<a name="line-199"></a>
<a name="line-200"></a><a name="mkNameLookup"></a><span class='hs-definition'>mkNameLookup</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span>
<a name="line-201"></a><span class='hs-definition'>mkNameLookup</span> <span class='hs-varid'>kvs</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>field</span> <span class='hs-keyglyph'>=</span>
<a name="line-202"></a> <span class='hs-keyglyph'>[</span> <span class='hs-conid'>TopName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>kvs</span><span class='hs-layout'>,</span> <span class='hs-varid'>k</span> <span class='hs-varop'>==</span> <span class='hs-varid'>nameBase</span> <span class='hs-varid'>field</span><span class='hs-keyglyph'>]</span>
<a name="line-203"></a>
<a name="line-204"></a><a name="classyRules"></a><span class='hs-comment'>-- | Rules for making lenses and traversals that precompose another 'Lens'.</span>
<a name="line-205"></a><span class='hs-definition'>classyRules</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span>
<a name="line-206"></a><span class='hs-definition'>classyRules</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LensRules</span>
<a name="line-207"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_simpleLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-208"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateSigs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-209"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateClasses</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-210"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_allowIsos</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span> <span class='hs-comment'>-- generating Isos would hinder "subtyping"</span>
<a name="line-211"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_allowUpdates</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-212"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_lazyPatterns</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-213"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_classyLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span>
<a name="line-214"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>nameBase</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>of</span>
<a name="line-215"></a> <span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-layout'>(</span><span class='hs-str'>"Has"</span> <span class='hs-varop'>++</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-layout'>,</span> <span class='hs-varid'>mkName</span> <span class='hs-layout'>(</span><span class='hs-varid'>toLower</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-layout'>)</span>
<a name="line-216"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-217"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_fieldToDef</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span>
<a name="line-218"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>nameBase</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>of</span>
<a name="line-219"></a> <span class='hs-chr'>'_'</span><span class='hs-conop'>:</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TopName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-layout'>(</span><span class='hs-varid'>toLower</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-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-220"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-221"></a> <span class='hs-layout'>}</span>
<a name="line-222"></a>
<a name="line-223"></a><a name="classyRulesFor"></a><span class='hs-comment'>-- | Rules for making lenses and traversals that precompose another 'Lens'</span>
<a name="line-224"></a><span class='hs-comment'>-- using a custom function for naming the class, main class method, and a</span>
<a name="line-225"></a><span class='hs-comment'>-- mapping from field names to definition names.</span>
<a name="line-226"></a><span class='hs-definition'>classyRulesFor</span>
<a name="line-227"></a> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-comment'>{- ^ Type Name -> Maybe (Class Name, Method Name) -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-228"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>{- ^ [(Field Name, Method Name)] -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-229"></a> <span class='hs-conid'>LensRules</span>
<a name="line-230"></a><span class='hs-definition'>classyRulesFor</span> <span class='hs-varid'>classFun</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>classyRules</span>
<a name="line-231"></a> <span class='hs-varop'>&</span> <span class='hs-varid'>lensClass</span> <span class='hs-varop'>.~</span> <span class='hs-layout'>(</span><span class='hs-varid'>over</span> <span class='hs-layout'>(</span><span class='hs-varid'>mapped</span> <span class='hs-varop'>.</span> <span class='hs-varid'>both</span><span class='hs-layout'>)</span> <span class='hs-varid'>mkName</span> <span class='hs-varop'>.</span> <span class='hs-varid'>classFun</span> <span class='hs-varop'>.</span> <span class='hs-varid'>nameBase</span><span class='hs-layout'>)</span>
<a name="line-232"></a> <span class='hs-varop'>&</span> <span class='hs-varid'>lensField</span> <span class='hs-varop'>.~</span> <span class='hs-varid'>mkNameLookup</span> <span class='hs-varid'>fields</span>
<a name="line-233"></a>
<a name="line-234"></a><a name="classyRules_"></a><span class='hs-definition'>classyRules_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span>
<a name="line-235"></a><span class='hs-definition'>classyRules_</span>
<a name="line-236"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>classyRules</span> <span class='hs-varop'>&</span> <span class='hs-varid'>lensField</span> <span class='hs-varop'>.~</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TopName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-layout'>(</span><span class='hs-chr'>'_'</span><span class='hs-conop'>:</span><span class='hs-varid'>nameBase</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-237"></a>
<a name="line-238"></a><a name="makeLenses"></a><span class='hs-comment'>-- | Build lenses (and traversals) with a sensible default configuration.</span>
<a name="line-239"></a><span class='hs-comment'>--</span>
<a name="line-240"></a><span class='hs-comment'>-- /e.g./</span>
<a name="line-241"></a><span class='hs-comment'>--</span>
<a name="line-242"></a><span class='hs-comment'>-- @</span>
<a name="line-243"></a><span class='hs-comment'>-- data FooBar</span>
<a name="line-244"></a><span class='hs-comment'>-- = Foo { _x, _y :: 'Int' }</span>
<a name="line-245"></a><span class='hs-comment'>-- | Bar { _x :: 'Int' }</span>
<a name="line-246"></a><span class='hs-comment'>-- 'makeLenses' ''FooBar</span>
<a name="line-247"></a><span class='hs-comment'>-- @</span>
<a name="line-248"></a><span class='hs-comment'>--</span>
<a name="line-249"></a><span class='hs-comment'>-- will create</span>
<a name="line-250"></a><span class='hs-comment'>--</span>
<a name="line-251"></a><span class='hs-comment'>-- @</span>
<a name="line-252"></a><span class='hs-comment'>-- x :: 'Lens'' FooBar 'Int'</span>
<a name="line-253"></a><span class='hs-comment'>-- x f (Foo a b) = (\\a\' -> Foo a\' b) \<$\> f a</span>
<a name="line-254"></a><span class='hs-comment'>-- x f (Bar a) = Bar \<$\> f a</span>
<a name="line-255"></a><span class='hs-comment'>-- y :: 'Traversal'' FooBar 'Int'</span>
<a name="line-256"></a><span class='hs-comment'>-- y f (Foo a b) = (\\b\' -> Foo a b\') \<$\> f b</span>
<a name="line-257"></a><span class='hs-comment'>-- y _ c\@(Bar _) = pure c</span>
<a name="line-258"></a><span class='hs-comment'>-- @</span>
<a name="line-259"></a><span class='hs-comment'>--</span>
<a name="line-260"></a><span class='hs-comment'>-- @</span>
<a name="line-261"></a><span class='hs-comment'>-- 'makeLenses' = 'makeLensesWith' 'lensRules'</span>
<a name="line-262"></a><span class='hs-comment'>-- @</span>
<a name="line-263"></a><span class='hs-definition'>makeLenses</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-264"></a><span class='hs-definition'>makeLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeFieldOptics</span> <span class='hs-varid'>lensRules</span>
<a name="line-265"></a>
<a name="line-266"></a><a name="makeClassy"></a><span class='hs-comment'>-- | Make lenses and traversals for a type, and create a class when the</span>
<a name="line-267"></a><span class='hs-comment'>-- type has no arguments.</span>
<a name="line-268"></a><span class='hs-comment'>--</span>
<a name="line-269"></a><span class='hs-comment'>-- /e.g./</span>
<a name="line-270"></a><span class='hs-comment'>--</span>
<a name="line-271"></a><span class='hs-comment'>-- @</span>
<a name="line-272"></a><span class='hs-comment'>-- data Foo = Foo { _fooX, _fooY :: 'Int' }</span>
<a name="line-273"></a><span class='hs-comment'>-- 'makeClassy' ''Foo</span>
<a name="line-274"></a><span class='hs-comment'>-- @</span>
<a name="line-275"></a><span class='hs-comment'>--</span>
<a name="line-276"></a><span class='hs-comment'>-- will create</span>
<a name="line-277"></a><span class='hs-comment'>--</span>
<a name="line-278"></a><span class='hs-comment'>-- @</span>
<a name="line-279"></a><span class='hs-comment'>-- class HasFoo t where</span>
<a name="line-280"></a><span class='hs-comment'>-- foo :: 'Lens'' t Foo</span>
<a name="line-281"></a><span class='hs-comment'>-- fooX :: 'Lens'' t 'Int'</span>
<a name="line-282"></a><span class='hs-comment'>-- fooX = foo . go where go f (Foo x y) = (\\x\' -> Foo x' y) \<$\> f x</span>
<a name="line-283"></a><span class='hs-comment'>-- fooY :: 'Lens'' t 'Int'</span>
<a name="line-284"></a><span class='hs-comment'>-- fooY = foo . go where go f (Foo x y) = (\\y\' -> Foo x y') \<$\> f y</span>
<a name="line-285"></a><span class='hs-comment'>-- instance HasFoo Foo where</span>
<a name="line-286"></a><span class='hs-comment'>-- foo = id</span>
<a name="line-287"></a><span class='hs-comment'>-- @</span>
<a name="line-288"></a><span class='hs-comment'>--</span>
<a name="line-289"></a><span class='hs-comment'>-- @</span>
<a name="line-290"></a><span class='hs-comment'>-- 'makeClassy' = 'makeLensesWith' 'classyRules'</span>
<a name="line-291"></a><span class='hs-comment'>-- @</span>
<a name="line-292"></a><span class='hs-definition'>makeClassy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-293"></a><span class='hs-definition'>makeClassy</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeFieldOptics</span> <span class='hs-varid'>classyRules</span>
<a name="line-294"></a>
<a name="line-295"></a><a name="makeClassy_"></a><span class='hs-comment'>-- | Make lenses and traversals for a type, and create a class when the type</span>
<a name="line-296"></a><span class='hs-comment'>-- has no arguments. Works the same as 'makeClassy' except that (a) it</span>
<a name="line-297"></a><span class='hs-comment'>-- expects that record field names do not begin with an underscore, (b) all</span>
<a name="line-298"></a><span class='hs-comment'>-- record fields are made into lenses, and (c) the resulting lens is prefixed</span>
<a name="line-299"></a><span class='hs-comment'>-- with an underscore.</span>
<a name="line-300"></a><span class='hs-definition'>makeClassy_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-301"></a><span class='hs-definition'>makeClassy_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeFieldOptics</span> <span class='hs-varid'>classyRules_</span>
<a name="line-302"></a>
<a name="line-303"></a><a name="makeLensesFor"></a><span class='hs-comment'>-- | Derive lenses and traversals, specifying explicit pairings</span>
<a name="line-304"></a><span class='hs-comment'>-- of @(fieldName, lensName)@.</span>
<a name="line-305"></a><span class='hs-comment'>--</span>
<a name="line-306"></a><span class='hs-comment'>-- If you map multiple names to the same label, and it is present in the same</span>
<a name="line-307"></a><span class='hs-comment'>-- constructor then this will generate a 'Traversal'.</span>
<a name="line-308"></a><span class='hs-comment'>--</span>
<a name="line-309"></a><span class='hs-comment'>-- /e.g./</span>
<a name="line-310"></a><span class='hs-comment'>--</span>
<a name="line-311"></a><span class='hs-comment'>-- @</span>
<a name="line-312"></a><span class='hs-comment'>-- 'makeLensesFor' [(\"_foo\", \"fooLens\"), (\"baz\", \"lbaz\")] ''Foo</span>
<a name="line-313"></a><span class='hs-comment'>-- 'makeLensesFor' [(\"_barX\", \"bar\"), (\"_barY\", \"bar\")] ''Bar</span>
<a name="line-314"></a><span class='hs-comment'>-- @</span>
<a name="line-315"></a><span class='hs-definition'>makeLensesFor</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-316"></a><span class='hs-definition'>makeLensesFor</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeFieldOptics</span> <span class='hs-layout'>(</span><span class='hs-varid'>lensRulesFor</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span>
<a name="line-317"></a>
<a name="line-318"></a><a name="makeClassyFor"></a><span class='hs-comment'>-- | Derive lenses and traversals, using a named wrapper class, and</span>
<a name="line-319"></a><span class='hs-comment'>-- specifying explicit pairings of @(fieldName, traversalName)@.</span>
<a name="line-320"></a><span class='hs-comment'>--</span>
<a name="line-321"></a><span class='hs-comment'>-- Example usage:</span>
<a name="line-322"></a><span class='hs-comment'>--</span>
<a name="line-323"></a><span class='hs-comment'>-- @</span>
<a name="line-324"></a><span class='hs-comment'>-- 'makeClassyFor' \"HasFoo\" \"foo\" [(\"_foo\", \"fooLens\"), (\"bar\", \"lbar\")] ''Foo</span>
<a name="line-325"></a><span class='hs-comment'>-- @</span>
<a name="line-326"></a><span class='hs-definition'>makeClassyFor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-327"></a><span class='hs-definition'>makeClassyFor</span> <span class='hs-varid'>clsName</span> <span class='hs-varid'>funName</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeFieldOptics</span> <span class='hs-varop'>$</span>
<a name="line-328"></a> <span class='hs-varid'>classyRulesFor</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>clsName</span><span class='hs-layout'>,</span> <span class='hs-varid'>funName</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>fields</span>
<a name="line-329"></a>
<a name="line-330"></a><a name="makeLensesWith"></a><span class='hs-comment'>-- | Build lenses with a custom configuration.</span>
<a name="line-331"></a><span class='hs-definition'>makeLensesWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-332"></a><span class='hs-definition'>makeLensesWith</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeFieldOptics</span>
<a name="line-333"></a>
<a name="line-334"></a>
<a name="line-335"></a>
<a name="line-336"></a><a name="declareLenses"></a><span class='hs-comment'>-- | Make lenses for all records in the given declaration quote. All record</span>
<a name="line-337"></a><span class='hs-comment'>-- syntax in the input will be stripped off.</span>
<a name="line-338"></a><span class='hs-comment'>--</span>
<a name="line-339"></a><span class='hs-comment'>-- /e.g./</span>
<a name="line-340"></a><span class='hs-comment'>--</span>
<a name="line-341"></a><span class='hs-comment'>-- @</span>
<a name="line-342"></a><span class='hs-comment'>-- declareLenses [d|</span>
<a name="line-343"></a><span class='hs-comment'>-- data Foo = Foo { fooX, fooY :: 'Int' }</span>
<a name="line-344"></a><span class='hs-comment'>-- deriving 'Show'</span>
<a name="line-345"></a><span class='hs-comment'>-- |]</span>
<a name="line-346"></a><span class='hs-comment'>-- @</span>
<a name="line-347"></a><span class='hs-comment'>--</span>
<a name="line-348"></a><span class='hs-comment'>-- will create</span>
<a name="line-349"></a><span class='hs-comment'>--</span>
<a name="line-350"></a><span class='hs-comment'>-- @</span>
<a name="line-351"></a><span class='hs-comment'>-- data Foo = Foo 'Int' 'Int' deriving 'Show'</span>
<a name="line-352"></a><span class='hs-comment'>-- fooX, fooY :: 'Lens'' Foo Int</span>
<a name="line-353"></a><span class='hs-comment'>-- @</span>
<a name="line-354"></a><span class='hs-definition'>declareLenses</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-355"></a><span class='hs-definition'>declareLenses</span>
<a name="line-356"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>declareLensesWith</span>
<a name="line-357"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>lensRules</span>
<a name="line-358"></a> <span class='hs-varop'>&</span> <span class='hs-varid'>lensField</span> <span class='hs-varop'>.~</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TopName</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span>
<a name="line-359"></a>
<a name="line-360"></a><a name="declareLensesFor"></a><span class='hs-comment'>-- | Similar to 'makeLensesFor', but takes a declaration quote.</span>
<a name="line-361"></a><span class='hs-definition'>declareLensesFor</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-362"></a><span class='hs-definition'>declareLensesFor</span> <span class='hs-varid'>fields</span>
<a name="line-363"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>declareLensesWith</span>
<a name="line-364"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>lensRulesFor</span> <span class='hs-varid'>fields</span>
<a name="line-365"></a> <span class='hs-varop'>&</span> <span class='hs-varid'>lensField</span> <span class='hs-varop'>.~</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TopName</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span>
<a name="line-366"></a>
<a name="line-367"></a><a name="declareClassy"></a><span class='hs-comment'>-- | For each record in the declaration quote, make lenses and traversals for</span>
<a name="line-368"></a><span class='hs-comment'>-- it, and create a class when the type has no arguments. All record syntax</span>
<a name="line-369"></a><span class='hs-comment'>-- in the input will be stripped off.</span>
<a name="line-370"></a><span class='hs-comment'>--</span>
<a name="line-371"></a><span class='hs-comment'>-- /e.g./</span>
<a name="line-372"></a><span class='hs-comment'>--</span>
<a name="line-373"></a><span class='hs-comment'>-- @</span>
<a name="line-374"></a><span class='hs-comment'>-- declareClassy [d|</span>
<a name="line-375"></a><span class='hs-comment'>-- data Foo = Foo { fooX, fooY :: 'Int' }</span>
<a name="line-376"></a><span class='hs-comment'>-- deriving 'Show'</span>
<a name="line-377"></a><span class='hs-comment'>-- |]</span>
<a name="line-378"></a><span class='hs-comment'>-- @</span>
<a name="line-379"></a><span class='hs-comment'>--</span>
<a name="line-380"></a><span class='hs-comment'>-- will create</span>
<a name="line-381"></a><span class='hs-comment'>--</span>
<a name="line-382"></a><span class='hs-comment'>-- @</span>
<a name="line-383"></a><span class='hs-comment'>-- data Foo = Foo 'Int' 'Int' deriving 'Show'</span>
<a name="line-384"></a><span class='hs-comment'>-- class HasFoo t where</span>
<a name="line-385"></a><span class='hs-comment'>-- foo :: 'Lens'' t Foo</span>
<a name="line-386"></a><span class='hs-comment'>-- instance HasFoo Foo where foo = 'id'</span>
<a name="line-387"></a><span class='hs-comment'>-- fooX, fooY :: HasFoo t => 'Lens'' t 'Int'</span>
<a name="line-388"></a><span class='hs-comment'>-- @</span>
<a name="line-389"></a><span class='hs-definition'>declareClassy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-390"></a><span class='hs-definition'>declareClassy</span>
<a name="line-391"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>declareLensesWith</span>
<a name="line-392"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>classyRules</span>
<a name="line-393"></a> <span class='hs-varop'>&</span> <span class='hs-varid'>lensField</span> <span class='hs-varop'>.~</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TopName</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span>
<a name="line-394"></a>
<a name="line-395"></a><a name="declareClassyFor"></a><span class='hs-comment'>-- | Similar to 'makeClassyFor', but takes a declaration quote.</span>
<a name="line-396"></a><span class='hs-definition'>declareClassyFor</span> <span class='hs-keyglyph'>::</span>
<a name="line-397"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-398"></a><span class='hs-definition'>declareClassyFor</span> <span class='hs-varid'>classes</span> <span class='hs-varid'>fields</span>
<a name="line-399"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>declareLensesWith</span>
<a name="line-400"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>classyRulesFor</span> <span class='hs-layout'>(</span><span class='hs-varop'>`</span><span class='hs-conid'>Prelude</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span><span class='hs-varop'>`</span><span class='hs-varid'>classes</span><span class='hs-layout'>)</span> <span class='hs-varid'>fields</span>
<a name="line-401"></a> <span class='hs-varop'>&</span> <span class='hs-varid'>lensField</span> <span class='hs-varop'>.~</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TopName</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span>
<a name="line-402"></a>
<a name="line-403"></a><a name="declarePrisms"></a><span class='hs-comment'>-- | Generate a 'Prism' for each constructor of each data type.</span>
<a name="line-404"></a><span class='hs-comment'>--</span>
<a name="line-405"></a><span class='hs-comment'>-- /e.g./</span>
<a name="line-406"></a><span class='hs-comment'>--</span>
<a name="line-407"></a><span class='hs-comment'>-- @</span>
<a name="line-408"></a><span class='hs-comment'>-- declarePrisms [d|</span>
<a name="line-409"></a><span class='hs-comment'>-- data Exp = Lit Int | Var String | Lambda{ bound::String, body::Exp }</span>
<a name="line-410"></a><span class='hs-comment'>-- |]</span>
<a name="line-411"></a><span class='hs-comment'>-- @</span>
<a name="line-412"></a><span class='hs-comment'>--</span>
<a name="line-413"></a><span class='hs-comment'>-- will create</span>
<a name="line-414"></a><span class='hs-comment'>--</span>
<a name="line-415"></a><span class='hs-comment'>-- @</span>
<a name="line-416"></a><span class='hs-comment'>-- data Exp = Lit Int | Var String | Lambda { bound::String, body::Exp }</span>
<a name="line-417"></a><span class='hs-comment'>-- _Lit :: 'Prism'' Exp Int</span>
<a name="line-418"></a><span class='hs-comment'>-- _Var :: 'Prism'' Exp String</span>
<a name="line-419"></a><span class='hs-comment'>-- _Lambda :: 'Prism'' Exp (String, Exp)</span>
<a name="line-420"></a><span class='hs-comment'>-- @</span>
<a name="line-421"></a><span class='hs-definition'>declarePrisms</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-422"></a><span class='hs-definition'>declarePrisms</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>declareWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-423"></a> <span class='hs-varid'>emit</span> <span class='hs-varop'>=<<</span> <span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeDecPrisms</span> <span class='hs-conid'>True</span> <span class='hs-varid'>dec</span><span class='hs-layout'>)</span>
<a name="line-424"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>dec</span>
<a name="line-425"></a>
<a name="line-426"></a><a name="declareWrapped"></a><span class='hs-comment'>-- | Build 'Wrapped' instance for each newtype.</span>
<a name="line-427"></a><span class='hs-definition'>declareWrapped</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-428"></a><span class='hs-definition'>declareWrapped</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>declareWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-429"></a> <span class='hs-varid'>maybeDecs</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeWrappedForDec</span> <span class='hs-varid'>dec</span><span class='hs-layout'>)</span>
<a name="line-430"></a> <span class='hs-varid'>forM_</span> <span class='hs-varid'>maybeDecs</span> <span class='hs-varid'>emit</span>
<a name="line-431"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>dec</span>
<a name="line-432"></a>
<a name="line-433"></a><a name="declareFields"></a><span class='hs-comment'>-- | @ declareFields = 'declareLensesWith' 'defaultFieldRules' @</span>
<a name="line-434"></a><span class='hs-definition'>declareFields</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-435"></a><span class='hs-definition'>declareFields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>declareLensesWith</span> <span class='hs-varid'>defaultFieldRules</span>
<a name="line-436"></a>
<a name="line-437"></a><a name="declareLensesWith"></a><span class='hs-comment'>-- | Declare lenses for each records in the given declarations, using the</span>
<a name="line-438"></a><span class='hs-comment'>-- specified 'LensRules'. Any record syntax in the input will be stripped</span>
<a name="line-439"></a><span class='hs-comment'>-- off.</span>
<a name="line-440"></a><span class='hs-definition'>declareLensesWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-441"></a><span class='hs-definition'>declareLensesWith</span> <span class='hs-varid'>rules</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>declareWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-442"></a> <span class='hs-varid'>emit</span> <span class='hs-varop'>=<<</span> <span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeFieldOpticsForDec</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>dec</span><span class='hs-layout'>)</span>
<a name="line-443"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>stripFields</span> <span class='hs-varid'>dec</span>
<a name="line-444"></a>
<a name="line-445"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-446"></a><span class='hs-comment'>-- Internal TH Implementation</span>
<a name="line-447"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-448"></a>
<a name="line-449"></a><a name="deNewtype"></a><span class='hs-comment'>-- | Transform @NewtypeD@s declarations to @DataD@s and @NewtypeInstD@s to</span>
<a name="line-450"></a><span class='hs-comment'>-- @DataInstD@s.</span>
<a name="line-451"></a><span class='hs-definition'>deNewtype</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dec</span>
<a name="line-452"></a><span class='hs-definition'>deNewtype</span> <span class='hs-layout'>(</span><span class='hs-conid'>NewtypeD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>args</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DataD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>d</span>
<a name="line-453"></a><span class='hs-definition'>deNewtype</span> <span class='hs-layout'>(</span><span class='hs-conid'>NewtypeInstD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>args</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DataInstD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>d</span>
<a name="line-454"></a><span class='hs-definition'>deNewtype</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span>
<a name="line-455"></a>
<a name="line-456"></a>
<a name="line-457"></a><a name="freshMap"></a><span class='hs-comment'>-- | Given a set of names, build a map from those names to a set of fresh names</span>
<a name="line-458"></a><span class='hs-comment'>-- based on them.</span>
<a name="line-459"></a><span class='hs-definition'>freshMap</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Set</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Name</span><span class='hs-layout'>)</span>
<a name="line-460"></a><span class='hs-definition'>freshMap</span> <span class='hs-varid'>ns</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varop'><$></span> <span class='hs-varid'>for</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-varid'>ns</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>(,)</span> <span class='hs-varid'>n</span> <span class='hs-varop'><$></span> <span class='hs-varid'>newName</span> <span class='hs-layout'>(</span><span class='hs-varid'>nameBase</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-461"></a>
<a name="line-462"></a>
<a name="line-463"></a><a name="apps"></a><span class='hs-definition'>apps</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Type</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span>
<a name="line-464"></a><span class='hs-definition'>apps</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Prelude</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl</span> <span class='hs-conid'>AppT</span>
<a name="line-465"></a>
<a name="line-466"></a>
<a name="line-467"></a><a name="makeDataDecl"></a><span class='hs-definition'>makeDataDecl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>DataDecl</span>
<a name="line-468"></a><span class='hs-definition'>makeDataDecl</span> <span class='hs-varid'>dec</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>deNewtype</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>of</span>
<a name="line-469"></a> <span class='hs-conid'>DataD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>args</span> <span class='hs-varid'>cons</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-conid'>DataDecl</span>
<a name="line-470"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>dataContext</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ctx</span>
<a name="line-471"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tyConName</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>tyName</span>
<a name="line-472"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dataParameters</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>args</span>
<a name="line-473"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fullType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>apps</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ConT</span> <span class='hs-varid'>tyName</span>
<a name="line-474"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>constructors</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cons</span>
<a name="line-475"></a> <span class='hs-layout'>}</span>
<a name="line-476"></a> <span class='hs-conid'>DataInstD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>familyName</span> <span class='hs-varid'>args</span> <span class='hs-varid'>cons</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-conid'>DataDecl</span>
<a name="line-477"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>dataContext</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ctx</span>
<a name="line-478"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tyConName</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-479"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dataParameters</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-conid'>PlainTV</span> <span class='hs-varid'>vars</span>
<a name="line-480"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fullType</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>tys</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>apps</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConT</span> <span class='hs-varid'>familyName</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-481"></a> <span class='hs-varid'>substType</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varop'>$</span> <span class='hs-varid'>zip</span> <span class='hs-varid'>vars</span> <span class='hs-varid'>tys</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span>
<a name="line-482"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>constructors</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cons</span>
<a name="line-483"></a> <span class='hs-layout'>}</span>
<a name="line-484"></a> <span class='hs-keyword'>where</span>
<a name="line-485"></a> <span class='hs-comment'>-- The list of "type parameters" to a data family instance is not</span>
<a name="line-486"></a> <span class='hs-comment'>-- explicitly specified in the source. Here we define it to be</span>
<a name="line-487"></a> <span class='hs-comment'>-- the set of distinct type variables that appear in the LHS. e.g.</span>
<a name="line-488"></a> <span class='hs-comment'>--</span>
<a name="line-489"></a> <span class='hs-comment'>-- data instance F a Int (Maybe (a, b)) = G</span>
<a name="line-490"></a> <span class='hs-comment'>--</span>
<a name="line-491"></a> <span class='hs-comment'>-- has 2 type parameters: a and b.</span>
<a name="line-492"></a> <span class='hs-varid'>vars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toList</span> <span class='hs-varop'>$</span> <span class='hs-varid'>setOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>args</span>
<a name="line-493"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-494"></a>
<a name="line-495"></a><a name="DataDecl"></a><span class='hs-comment'>-- | A data, newtype, data instance or newtype instance declaration.</span>
<a name="line-496"></a><a name="DataDecl"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DataDecl</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DataDecl</span>
<a name="line-497"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>dataContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Cxt</span> <span class='hs-comment'>-- ^ Datatype context.</span>
<a name="line-498"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tyConName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Name</span>
<a name="line-499"></a> <span class='hs-comment'>-- ^ Type constructor name, or Nothing for a data family instance.</span>
<a name="line-500"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dataParameters</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TyVarBndr</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ List of type parameters</span>
<a name="line-501"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fullType</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Type</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span>
<a name="line-502"></a> <span class='hs-comment'>-- ^ Create a concrete record type given a substitution to</span>
<a name="line-503"></a> <span class='hs-comment'>-- 'detaParameters'.</span>
<a name="line-504"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>constructors</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Con</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ Constructors</span>
<a name="line-505"></a> <span class='hs-comment'>-- , derivings :: [Name] -- currently not needed</span>
<a name="line-506"></a> <span class='hs-layout'>}</span>
<a name="line-507"></a>
<a name="line-508"></a>
<a name="line-509"></a>
<a name="line-510"></a><a name="makeWrapped"></a><span class='hs-comment'>-- | Build 'Wrapped' instance for a given newtype</span>
<a name="line-511"></a><span class='hs-definition'>makeWrapped</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-512"></a><span class='hs-definition'>makeWrapped</span> <span class='hs-varid'>nm</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-513"></a> <span class='hs-varid'>inf</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>reify</span> <span class='hs-varid'>nm</span>
<a name="line-514"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>inf</span> <span class='hs-keyword'>of</span>
<a name="line-515"></a> <span class='hs-conid'>TyConI</span> <span class='hs-varid'>decl</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-516"></a> <span class='hs-varid'>maybeDecs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>makeWrappedForDec</span> <span class='hs-varid'>decl</span>
<a name="line-517"></a> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>fail</span> <span class='hs-str'>"makeWrapped: Unsupported data type"</span><span class='hs-layout'>)</span> <span class='hs-varid'>return</span> <span class='hs-varid'>maybeDecs</span>
<a name="line-518"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"makeWrapped: Expected the name of a newtype or datatype"</span>
<a name="line-519"></a>
<a name="line-520"></a><a name="makeWrappedForDec"></a><span class='hs-definition'>makeWrappedForDec</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-521"></a><span class='hs-definition'>makeWrappedForDec</span> <span class='hs-varid'>decl</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>makeDataDecl</span> <span class='hs-varid'>decl</span> <span class='hs-keyword'>of</span>
<a name="line-522"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>dataDecl</span> <span class='hs-keyglyph'>|</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>con</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>constructors</span> <span class='hs-varid'>dataDecl</span>
<a name="line-523"></a> <span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>field</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>toListOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>conFields</span><span class='hs-varop'>.</span><span class='hs-sel'>_2</span><span class='hs-layout'>)</span> <span class='hs-varid'>con</span>
<a name="line-524"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>wrapped</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>makeWrappedInstance</span> <span class='hs-varid'>dataDecl</span> <span class='hs-varid'>con</span> <span class='hs-varid'>field</span>
<a name="line-525"></a> <span class='hs-varid'>rewrapped</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>makeRewrappedInstance</span> <span class='hs-varid'>dataDecl</span>
<a name="line-526"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>rewrapped</span><span class='hs-layout'>,</span> <span class='hs-varid'>wrapped</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-527"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-528"></a>
<a name="line-529"></a><a name="makeRewrappedInstance"></a><span class='hs-definition'>makeRewrappedInstance</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DataDecl</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecQ</span>
<a name="line-530"></a><span class='hs-definition'>makeRewrappedInstance</span> <span class='hs-varid'>dataDecl</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-531"></a>
<a name="line-532"></a> <span class='hs-varid'>t</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>varT</span> <span class='hs-varop'><$></span> <span class='hs-varid'>newName</span> <span class='hs-str'>"t"</span>
<a name="line-533"></a>
<a name="line-534"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>typeArgs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>view</span> <span class='hs-varid'>name</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>dataParameters</span> <span class='hs-varid'>dataDecl</span><span class='hs-layout'>)</span>
<a name="line-535"></a>
<a name="line-536"></a> <span class='hs-varid'>typeArgs'</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>do</span>
<a name="line-537"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>freshMap</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>typeArgs</span><span class='hs-layout'>)</span>
<a name="line-538"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>substTypeVars</span> <span class='hs-varid'>m</span> <span class='hs-varid'>typeArgs</span><span class='hs-layout'>)</span>
<a name="line-539"></a>
<a name="line-540"></a> <span class='hs-comment'>-- Con a b c...</span>
<a name="line-541"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>appliedType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fullType</span> <span class='hs-varid'>dataDecl</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-conid'>VarT</span> <span class='hs-varid'>typeArgs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-542"></a>
<a name="line-543"></a> <span class='hs-comment'>-- Con a' b' c'...</span>
<a name="line-544"></a> <span class='hs-varid'>appliedType'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fullType</span> <span class='hs-varid'>dataDecl</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-conid'>VarT</span> <span class='hs-varid'>typeArgs'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-545"></a>
<a name="line-546"></a> <span class='hs-comment'>-- Con a' b' c'... ~ t</span>
<a name="line-547"></a><span class='hs-cpp'>#if MIN_VERSION_template_haskell(2,10,0)</span>
<a name="line-548"></a> <span class='hs-varid'>eq</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AppT</span><span class='hs-varop'>.</span> <span class='hs-conid'>AppT</span> <span class='hs-conid'>EqualityT</span> <span class='hs-varop'><$></span> <span class='hs-varid'>appliedType'</span> <span class='hs-varop'><*></span> <span class='hs-varid'>t</span>
<a name="line-549"></a><span class='hs-cpp'>#else</span>
<a name="line-550"></a> <span class='hs-varid'>eq</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>equalP</span> <span class='hs-varid'>appliedType'</span> <span class='hs-varid'>t</span>
<a name="line-551"></a><span class='hs-cpp'>#endif</span>
<a name="line-552"></a>
<a name="line-553"></a> <span class='hs-comment'>-- Rewrapped (Con a b c...) t</span>
<a name="line-554"></a> <span class='hs-varid'>klass</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>conT</span> <span class='hs-varid'>rewrappedTypeName</span> <span class='hs-varop'>`appsT`</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>appliedType</span><span class='hs-layout'>,</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>]</span>
<a name="line-555"></a>
<a name="line-556"></a> <span class='hs-comment'>-- instance (Con a' b' c'... ~ t) => Rewrapped (Con a b c...) t</span>
<a name="line-557"></a> <span class='hs-varid'>instanceD</span> <span class='hs-layout'>(</span><span class='hs-varid'>cxt</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>eq</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>klass</span> <span class='hs-conid'>[]</span>
<a name="line-558"></a>
<a name="line-559"></a><a name="makeWrappedInstance"></a><span class='hs-definition'>makeWrappedInstance</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DataDecl</span><span class='hs-keyglyph'>-></span> <span class='hs-conid'>Con</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecQ</span>
<a name="line-560"></a><span class='hs-definition'>makeWrappedInstance</span> <span class='hs-varid'>dataDecl</span> <span class='hs-varid'>con</span> <span class='hs-varid'>fieldType</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-561"></a>
<a name="line-562"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>conName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>view</span> <span class='hs-varid'>name</span> <span class='hs-varid'>con</span>
<a name="line-563"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>typeArgs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toListOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-layout'>(</span><span class='hs-varid'>dataParameters</span> <span class='hs-varid'>dataDecl</span><span class='hs-layout'>)</span>
<a name="line-564"></a>
<a name="line-565"></a> <span class='hs-comment'>-- Con a b c...</span>
<a name="line-566"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>appliedType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fullType</span> <span class='hs-varid'>dataDecl</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-conid'>VarT</span> <span class='hs-varid'>typeArgs</span><span class='hs-layout'>)</span>
<a name="line-567"></a>
<a name="line-568"></a> <span class='hs-comment'>-- type Unwrapped (Con a b c...) = $fieldType</span>
<a name="line-569"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>unwrappedATF</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tySynInstD'</span> <span class='hs-varid'>unwrappedTypeName</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>return</span> <span class='hs-varid'>appliedType</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>fieldType</span><span class='hs-layout'>)</span>
<a name="line-570"></a>
<a name="line-571"></a> <span class='hs-comment'>-- Wrapped (Con a b c...)</span>
<a name="line-572"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>klass</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>conT</span> <span class='hs-varid'>wrappedTypeName</span> <span class='hs-varop'>`appT`</span> <span class='hs-varid'>return</span> <span class='hs-varid'>appliedType</span>
<a name="line-573"></a>
<a name="line-574"></a> <span class='hs-comment'>-- _Wrapped' = iso (\(Con x) -> x) Con</span>
<a name="line-575"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>wrapFun</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>conE</span> <span class='hs-varid'>conName</span>
<a name="line-576"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>unwrapFun</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>newName</span> <span class='hs-str'>"x"</span> <span class='hs-varop'>>>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lam1E</span> <span class='hs-layout'>(</span><span class='hs-varid'>conP</span> <span class='hs-varid'>conName</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varP</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-577"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>body</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>appsE</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varE</span> <span class='hs-varid'>isoValName</span><span class='hs-layout'>,</span> <span class='hs-varid'>unwrapFun</span><span class='hs-layout'>,</span> <span class='hs-varid'>wrapFun</span><span class='hs-keyglyph'>]</span>
<a name="line-578"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>isoMethod</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>funD</span> <span class='hs-sel'>_wrapped'ValName</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>clause</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-varid'>body</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span><span class='hs-keyglyph'>]</span>
<a name="line-579"></a>
<a name="line-580"></a> <span class='hs-comment'>-- instance Wrapped (Con a b c...) where</span>
<a name="line-581"></a> <span class='hs-comment'>-- type Unwrapped (Con a b c...) = fieldType</span>
<a name="line-582"></a> <span class='hs-comment'>-- _Wrapped' = iso (\(Con x) -> x) Con</span>
<a name="line-583"></a> <span class='hs-varid'>instanceD</span> <span class='hs-layout'>(</span><span class='hs-varid'>cxt</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>klass</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>unwrappedATF</span><span class='hs-layout'>,</span> <span class='hs-varid'>isoMethod</span><span class='hs-keyglyph'>]</span>
<a name="line-584"></a>
<a name="line-585"></a><span class='hs-cpp'>#if !(MIN_VERSION_template_haskell(2,7,0))</span>
<a name="line-586"></a><a name="instance%20Applicative%20Q"></a><span class='hs-comment'>-- | The orphan instance for old versions is bad, but programming without 'Applicative' is worse.</span>
<a name="line-587"></a><a name="instance%20Applicative%20Q"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Applicative</span> <span class='hs-conid'>Q</span> <span class='hs-keyword'>where</span>
<a name="line-588"></a> <span class='hs-varid'>pure</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span>
<a name="line-589"></a> <span class='hs-layout'>(</span><span class='hs-varop'><*></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ap</span>
<a name="line-590"></a><span class='hs-cpp'>#endif</span>
<a name="line-591"></a>
<a name="line-592"></a><a name="overHead"></a><span class='hs-definition'>overHead</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</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-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-593"></a><span class='hs-definition'>overHead</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-594"></a><span class='hs-definition'>overHead</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span>
<a name="line-595"></a>
<a name="line-596"></a><a name="underscoreFields"></a><span class='hs-comment'>-- | Field rules for fields in the form @ _prefix_fieldname @</span>
<a name="line-597"></a><span class='hs-definition'>underscoreFields</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span>
<a name="line-598"></a><span class='hs-definition'>underscoreFields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultFieldRules</span> <span class='hs-varop'>&</span> <span class='hs-varid'>lensField</span> <span class='hs-varop'>.~</span> <span class='hs-varid'>underscoreNamer</span>
<a name="line-599"></a>
<a name="line-600"></a><a name="underscoreNamer"></a><span class='hs-definition'>underscoreNamer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span>
<a name="line-601"></a><span class='hs-definition'>underscoreNamer</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>field</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybeToList</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-602"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>prefix</span> <span class='hs-varid'>field'</span>
<a name="line-603"></a> <span class='hs-varid'>method</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>niceLens</span>
<a name="line-604"></a> <span class='hs-varid'>cls</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>classNaming</span>
<a name="line-605"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>MethodName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-varid'>cls</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-varid'>method</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-606"></a> <span class='hs-keyword'>where</span>
<a name="line-607"></a> <span class='hs-varid'>field'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>nameBase</span> <span class='hs-varid'>field</span>
<a name="line-608"></a> <span class='hs-varid'>prefix</span> <span class='hs-layout'>(</span><span class='hs-chr'>'_'</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-chr'>'_'</span> <span class='hs-varop'>`</span><span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>elem</span><span class='hs-varop'>`</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>takeWhile</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-chr'>'_'</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-609"></a> <span class='hs-varid'>prefix</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-610"></a> <span class='hs-varid'>niceLens</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prefix</span> <span class='hs-varid'>field'</span> <span class='hs-varop'><&></span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>drop</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span> <span class='hs-varid'>field'</span>
<a name="line-611"></a> <span class='hs-varid'>classNaming</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>niceLens</span> <span class='hs-varop'><&></span> <span class='hs-layout'>(</span><span class='hs-str'>"Has_"</span> <span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-612"></a>
<a name="line-613"></a><a name="camelCaseFields"></a><span class='hs-comment'>-- | Field rules for fields in the form @ prefixFieldname or _prefixFieldname @</span>
<a name="line-614"></a><span class='hs-comment'>-- If you want all fields to be lensed, then there is no reason to use an @_@ before the prefix.</span>
<a name="line-615"></a><span class='hs-comment'>-- If any of the record fields leads with an @_@ then it is assume a field without an @_@ should not have a lens created.</span>
<a name="line-616"></a><span class='hs-comment'>--</span>
<a name="line-617"></a><span class='hs-comment'>-- __Note__: The @prefix@ must be the same as the typename (with the first</span>
<a name="line-618"></a><span class='hs-comment'>-- letter lowercased). This is a change from lens versions before lens 4.5.</span>
<a name="line-619"></a><span class='hs-comment'>-- If you want the old behaviour, use 'makeLensesWith' 'abbreviatedFields'</span>
<a name="line-620"></a><span class='hs-definition'>camelCaseFields</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span>
<a name="line-621"></a><span class='hs-definition'>camelCaseFields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultFieldRules</span>
<a name="line-622"></a>
<a name="line-623"></a><a name="camelCaseNamer"></a><span class='hs-definition'>camelCaseNamer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span>
<a name="line-624"></a><span class='hs-definition'>camelCaseNamer</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>fields</span> <span class='hs-varid'>field</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybeToList</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-625"></a>
<a name="line-626"></a> <span class='hs-varid'>fieldPart</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>stripPrefix</span> <span class='hs-varid'>expectedPrefix</span> <span class='hs-layout'>(</span><span class='hs-varid'>nameBase</span> <span class='hs-varid'>field</span><span class='hs-layout'>)</span>
<a name="line-627"></a> <span class='hs-varid'>method</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>computeMethod</span> <span class='hs-varid'>fieldPart</span>
<a name="line-628"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>cls</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Has"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>fieldPart</span>
<a name="line-629"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>MethodName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-varid'>cls</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-varid'>method</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-630"></a>
<a name="line-631"></a> <span class='hs-keyword'>where</span>
<a name="line-632"></a> <span class='hs-varid'>expectedPrefix</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optUnderscore</span> <span class='hs-varop'>++</span> <span class='hs-varid'>overHead</span> <span class='hs-varid'>toLower</span> <span class='hs-layout'>(</span><span class='hs-varid'>nameBase</span> <span class='hs-varid'>tyName</span><span class='hs-layout'>)</span>
<a name="line-633"></a>
<a name="line-634"></a> <span class='hs-varid'>optUnderscore</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'_'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>any</span> <span class='hs-layout'>(</span><span class='hs-varid'>isPrefixOf</span> <span class='hs-str'>"_"</span> <span class='hs-varop'>.</span> <span class='hs-varid'>nameBase</span><span class='hs-layout'>)</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>]</span>
<a name="line-635"></a>
<a name="line-636"></a> <span class='hs-varid'>computeMethod</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isUpper</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>toLower</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-637"></a> <span class='hs-varid'>computeMethod</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-638"></a>
<a name="line-639"></a>
<a name="line-640"></a><a name="abbreviatedFields"></a><span class='hs-comment'>-- | Field rules fields in the form @ prefixFieldname or _prefixFieldname @</span>
<a name="line-641"></a><span class='hs-comment'>-- If you want all fields to be lensed, then there is no reason to use an @_@ before the prefix.</span>
<a name="line-642"></a><span class='hs-comment'>-- If any of the record fields leads with an @_@ then it is assume a field without an @_@ should not have a lens created.</span>
<a name="line-643"></a><span class='hs-comment'>--</span>
<a name="line-644"></a><span class='hs-comment'>-- Note that @prefix@ may be any string of characters that are not uppercase</span>
<a name="line-645"></a><span class='hs-comment'>-- letters. (In particular, it may be arbitrary string of lowercase letters</span>
<a name="line-646"></a><span class='hs-comment'>-- and numbers) This is the behavior that 'defaultFieldRules' had in lens</span>
<a name="line-647"></a><span class='hs-comment'>-- 4.4 and earlier.</span>
<a name="line-648"></a><span class='hs-definition'>abbreviatedFields</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span>
<a name="line-649"></a><span class='hs-definition'>abbreviatedFields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultFieldRules</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_fieldToDef</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>abbreviatedNamer</span> <span class='hs-layout'>}</span>
<a name="line-650"></a>
<a name="line-651"></a><a name="abbreviatedNamer"></a><span class='hs-definition'>abbreviatedNamer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span>
<a name="line-652"></a><span class='hs-definition'>abbreviatedNamer</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>fields</span> <span class='hs-varid'>field</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybeToList</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-653"></a>
<a name="line-654"></a> <span class='hs-varid'>fieldPart</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>stripMaxLc</span> <span class='hs-layout'>(</span><span class='hs-varid'>nameBase</span> <span class='hs-varid'>field</span><span class='hs-layout'>)</span>
<a name="line-655"></a> <span class='hs-varid'>method</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>computeMethod</span> <span class='hs-varid'>fieldPart</span>
<a name="line-656"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>cls</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Has"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>fieldPart</span>
<a name="line-657"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>MethodName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-varid'>cls</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkName</span> <span class='hs-varid'>method</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-658"></a>
<a name="line-659"></a> <span class='hs-keyword'>where</span>
<a name="line-660"></a> <span class='hs-varid'>stripMaxLc</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>stripPrefix</span> <span class='hs-varid'>optUnderscore</span> <span class='hs-varid'>f</span>
<a name="line-661"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>break</span> <span class='hs-varid'>isUpper</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-662"></a> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>p</span> <span class='hs-varop'>||</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-663"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>s</span>
<a name="line-664"></a> <span class='hs-varid'>optUnderscore</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'_'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>any</span> <span class='hs-layout'>(</span><span class='hs-varid'>isPrefixOf</span> <span class='hs-str'>"_"</span> <span class='hs-varop'>.</span> <span class='hs-varid'>nameBase</span><span class='hs-layout'>)</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>]</span>
<a name="line-665"></a>
<a name="line-666"></a> <span class='hs-varid'>computeMethod</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isUpper</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>toLower</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-667"></a> <span class='hs-varid'>computeMethod</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-668"></a>
<a name="line-669"></a>
<a name="line-670"></a><a name="makeFields"></a><span class='hs-comment'>-- | Generate overloaded field accessors.</span>
<a name="line-671"></a><span class='hs-comment'>--</span>
<a name="line-672"></a><span class='hs-comment'>-- /e.g/</span>
<a name="line-673"></a><span class='hs-comment'>--</span>
<a name="line-674"></a><span class='hs-comment'>-- @</span>
<a name="line-675"></a><span class='hs-comment'>-- data Foo a = Foo { _fooX :: 'Int', _fooY : a }</span>
<a name="line-676"></a><span class='hs-comment'>-- newtype Bar = Bar { _barX :: 'Char' }</span>
<a name="line-677"></a><span class='hs-comment'>-- makeFields ''Foo</span>
<a name="line-678"></a><span class='hs-comment'>-- makeFields ''Bar</span>
<a name="line-679"></a><span class='hs-comment'>-- @</span>
<a name="line-680"></a><span class='hs-comment'>--</span>
<a name="line-681"></a><span class='hs-comment'>-- will create</span>
<a name="line-682"></a><span class='hs-comment'>--</span>
<a name="line-683"></a><span class='hs-comment'>-- @</span>
<a name="line-684"></a><span class='hs-comment'>-- _fooXLens :: Lens' (Foo a) Int</span>
<a name="line-685"></a><span class='hs-comment'>-- _fooYLens :: Lens (Foo a) (Foo b) a b</span>
<a name="line-686"></a><span class='hs-comment'>-- class HasX s a | s -> a where</span>
<a name="line-687"></a><span class='hs-comment'>-- x :: Lens' s a</span>
<a name="line-688"></a><span class='hs-comment'>-- instance HasX (Foo a) Int where</span>
<a name="line-689"></a><span class='hs-comment'>-- x = _fooXLens</span>
<a name="line-690"></a><span class='hs-comment'>-- class HasY s a | s -> a where</span>
<a name="line-691"></a><span class='hs-comment'>-- y :: Lens' s a</span>
<a name="line-692"></a><span class='hs-comment'>-- instance HasY (Foo a) a where</span>
<a name="line-693"></a><span class='hs-comment'>-- y = _fooYLens</span>
<a name="line-694"></a><span class='hs-comment'>-- _barXLens :: Iso' Bar Char</span>
<a name="line-695"></a><span class='hs-comment'>-- instance HasX Bar Char where</span>
<a name="line-696"></a><span class='hs-comment'>-- x = _barXLens</span>
<a name="line-697"></a><span class='hs-comment'>-- @</span>
<a name="line-698"></a><span class='hs-comment'>--</span>
<a name="line-699"></a><span class='hs-comment'>-- For details, see 'camelCaseFields'.</span>
<a name="line-700"></a><span class='hs-comment'>--</span>
<a name="line-701"></a><span class='hs-comment'>-- @</span>
<a name="line-702"></a><span class='hs-comment'>-- makeFields = 'makeLensesWith' 'defaultFieldRules'</span>
<a name="line-703"></a><span class='hs-comment'>-- @</span>
<a name="line-704"></a><span class='hs-definition'>makeFields</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-705"></a><span class='hs-definition'>makeFields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeFieldOptics</span> <span class='hs-varid'>camelCaseFields</span>
<a name="line-706"></a>
<a name="line-707"></a><a name="defaultFieldRules"></a><span class='hs-definition'>defaultFieldRules</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span>
<a name="line-708"></a><span class='hs-definition'>defaultFieldRules</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LensRules</span>
<a name="line-709"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_simpleLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-710"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateSigs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-711"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateClasses</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span> <span class='hs-comment'>-- classes will still be skipped if they already exist</span>
<a name="line-712"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_allowIsos</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span> <span class='hs-comment'>-- generating Isos would hinder field class reuse</span>
<a name="line-713"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_allowUpdates</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-714"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_lazyPatterns</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-715"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_classyLenses</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>const</span> <span class='hs-conid'>Nothing</span>
<a name="line-716"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_fieldToDef</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>camelCaseNamer</span>
<a name="line-717"></a> <span class='hs-layout'>}</span>
<a name="line-718"></a>
<a name="line-719"></a>
<a name="line-720"></a><span class='hs-comment'>-- Declaration quote stuff</span>
<a name="line-721"></a>
<a name="line-722"></a><a name="declareWith"></a><span class='hs-definition'>declareWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Declare</span> <span class='hs-conid'>Dec</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-723"></a><span class='hs-definition'>declareWith</span> <span class='hs-varid'>fun</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>runDeclare</span> <span class='hs-varop'>.</span> <span class='hs-varid'>traverseDataAndNewtype</span> <span class='hs-varid'>fun</span> <span class='hs-varop'>=<<</span><span class='hs-layout'>)</span>
<a name="line-724"></a>
<a name="line-725"></a><a name="Declare"></a><span class='hs-comment'>-- | Monad for emitting top-level declarations as a side effect.</span>
<a name="line-726"></a><a name="Declare"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Declare</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>WriterT</span> <span class='hs-layout'>(</span><span class='hs-conid'>Endo</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-conid'>Q</span>
<a name="line-727"></a>
<a name="line-728"></a><a name="runDeclare"></a><span class='hs-definition'>runDeclare</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Declare</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-729"></a><span class='hs-definition'>runDeclare</span> <span class='hs-varid'>dec</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-730"></a> <span class='hs-layout'>(</span><span class='hs-varid'>out</span><span class='hs-layout'>,</span> <span class='hs-varid'>endo</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runWriterT</span> <span class='hs-varid'>dec</span>
<a name="line-731"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>out</span> <span class='hs-varop'>++</span> <span class='hs-varid'>appEndo</span> <span class='hs-varid'>endo</span> <span class='hs-conid'>[]</span>
<a name="line-732"></a>
<a name="line-733"></a><a name="emit"></a><span class='hs-definition'>emit</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Declare</span> <span class='hs-conid'>()</span>
<a name="line-734"></a><span class='hs-definition'>emit</span> <span class='hs-varid'>decs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tell</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Endo</span> <span class='hs-layout'>(</span><span class='hs-varid'>decs</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-735"></a>
<a name="line-736"></a><a name="traverseDataAndNewtype"></a><span class='hs-comment'>-- | Traverse each data, newtype, data instance or newtype instance</span>
<a name="line-737"></a><span class='hs-comment'>-- declaration.</span>
<a name="line-738"></a><span class='hs-definition'>traverseDataAndNewtype</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Applicative</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-conid'>Dec</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span>
<a name="line-739"></a><span class='hs-definition'>traverseDataAndNewtype</span> <span class='hs-varid'>f</span> <span class='hs-varid'>decs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>go</span> <span class='hs-varid'>decs</span>
<a name="line-740"></a> <span class='hs-keyword'>where</span>
<a name="line-741"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>dec</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>of</span>
<a name="line-742"></a> <span class='hs-conid'>DataD</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>dec</span>
<a name="line-743"></a> <span class='hs-conid'>NewtypeD</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>dec</span>
<a name="line-744"></a> <span class='hs-conid'>DataInstD</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>dec</span>
<a name="line-745"></a> <span class='hs-conid'>NewtypeInstD</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>dec</span>
<a name="line-746"></a>
<a name="line-747"></a> <span class='hs-comment'>-- Recurse into instance declarations because they main contain</span>
<a name="line-748"></a> <span class='hs-comment'>-- associated data family instances.</span>
<a name="line-749"></a> <span class='hs-conid'>InstanceD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>inst</span> <span class='hs-varid'>body</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>InstanceD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>inst</span> <span class='hs-varop'><$></span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>go</span> <span class='hs-varid'>body</span>
<a name="line-750"></a>
<a name="line-751"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pure</span> <span class='hs-varid'>dec</span>
<a name="line-752"></a>
<a name="line-753"></a><a name="stripFields"></a><span class='hs-definition'>stripFields</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dec</span>
<a name="line-754"></a><span class='hs-definition'>stripFields</span> <span class='hs-varid'>dec</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>of</span>
<a name="line-755"></a> <span class='hs-conid'>DataD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>tyArgs</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>derivings</span> <span class='hs-keyglyph'>-></span>
<a name="line-756"></a> <span class='hs-conid'>DataD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>tyArgs</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>deRecord</span> <span class='hs-varid'>cons</span><span class='hs-layout'>)</span> <span class='hs-varid'>derivings</span>
<a name="line-757"></a> <span class='hs-conid'>NewtypeD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>tyArgs</span> <span class='hs-varid'>con</span> <span class='hs-varid'>derivings</span> <span class='hs-keyglyph'>-></span>
<a name="line-758"></a> <span class='hs-conid'>NewtypeD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>tyArgs</span> <span class='hs-layout'>(</span><span class='hs-varid'>deRecord</span> <span class='hs-varid'>con</span><span class='hs-layout'>)</span> <span class='hs-varid'>derivings</span>
<a name="line-759"></a> <span class='hs-conid'>DataInstD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>tyArgs</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>derivings</span> <span class='hs-keyglyph'>-></span>
<a name="line-760"></a> <span class='hs-conid'>DataInstD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>tyArgs</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>deRecord</span> <span class='hs-varid'>cons</span><span class='hs-layout'>)</span> <span class='hs-varid'>derivings</span>
<a name="line-761"></a> <span class='hs-conid'>NewtypeInstD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>tyArgs</span> <span class='hs-varid'>con</span> <span class='hs-varid'>derivings</span> <span class='hs-keyglyph'>-></span>
<a name="line-762"></a> <span class='hs-conid'>NewtypeInstD</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>tyArgs</span> <span class='hs-layout'>(</span><span class='hs-varid'>deRecord</span> <span class='hs-varid'>con</span><span class='hs-layout'>)</span> <span class='hs-varid'>derivings</span>
<a name="line-763"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>dec</span>
<a name="line-764"></a>
<a name="line-765"></a><a name="deRecord"></a><span class='hs-definition'>deRecord</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Con</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Con</span>
<a name="line-766"></a><span class='hs-definition'>deRecord</span> <span class='hs-varid'>con</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>NormalC</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>con</span>
<a name="line-767"></a><span class='hs-definition'>deRecord</span> <span class='hs-varid'>con</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>InfixC</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>con</span>
<a name="line-768"></a><span class='hs-definition'>deRecord</span> <span class='hs-layout'>(</span><span class='hs-conid'>ForallC</span> <span class='hs-varid'>tyVars</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>con</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ForallC</span> <span class='hs-varid'>tyVars</span> <span class='hs-varid'>ctx</span> <span class='hs-varop'>$</span> <span class='hs-varid'>deRecord</span> <span class='hs-varid'>con</span>
<a name="line-769"></a><span class='hs-definition'>deRecord</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecC</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NormalC</span> <span class='hs-varid'>conName</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>dropFieldName</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span>
<a name="line-770"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>dropFieldName</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>str</span><span class='hs-layout'>,</span> <span class='hs-varid'>typ</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>str</span><span class='hs-layout'>,</span> <span class='hs-varid'>typ</span><span class='hs-layout'>)</span>
</pre></body>
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