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<title>src/Database/HaskellDB/FieldType.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts, UndecidableInstances, TypeSynonymInstances, FlexibleInstances
<a name="line-2"></a> , MultiParamTypeClasses #-}</span>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : FieldType</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : HWT Group (c) 2003, haskelldb-users@lists.sourceforge.net</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-8"></a><span class='hs-comment'>-- </span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : haskelldb-users@lists.sourceforge.net</span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- Defines the types of database columns, and functions</span>
<a name="line-14"></a><span class='hs-comment'>-- for converting these between HSQL and internal formats</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-- </span>
<a name="line-17"></a><span class='hs-comment'>-----------------------------------------------------------</span>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>HaskellDB</span><span class='hs-varop'>.</span><span class='hs-conid'>FieldType</span>
<a name="line-19"></a> <span class='hs-layout'>(</span><span class='hs-conid'>FieldDesc</span><span class='hs-layout'>,</span> <span class='hs-conid'>FieldType</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>toHaskellType</span><span class='hs-layout'>,</span> <span class='hs-conid'>ExprType</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>ExprTypes</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>queryFields</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Dynamic</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Time</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>HaskellDB</span><span class='hs-varop'>.</span><span class='hs-conid'>HDBRec</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Record</span><span class='hs-layout'>,</span> <span class='hs-conid'>RecNil</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>ShowLabels</span><span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>HaskellDB</span><span class='hs-varop'>.</span><span class='hs-conid'>BoundedString</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>HaskellDB</span><span class='hs-varop'>.</span><span class='hs-conid'>BoundedList</span> <span class='hs-layout'>(</span><span class='hs-varid'>listBound</span><span class='hs-layout'>,</span> <span class='hs-conid'>Size</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>HaskellDB</span><span class='hs-varop'>.</span><span class='hs-conid'>Query</span> <span class='hs-layout'>(</span><span class='hs-conid'>Expr</span><span class='hs-layout'>,</span> <span class='hs-conid'>Rel</span><span class='hs-layout'>,</span> <span class='hs-varid'>runQueryRel</span><span class='hs-layout'>,</span> <span class='hs-conid'>Query</span><span class='hs-layout'>,</span> <span class='hs-varid'>labels</span><span class='hs-layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a><a name="FieldDesc"></a><span class='hs-comment'>-- | The type and @nullable@ flag of a database column</span>
<a name="line-31"></a><a name="FieldDesc"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>FieldDesc</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>FieldType</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="FieldType"></a><span class='hs-comment'>-- | A database column type</span>
<a name="line-34"></a><a name="FieldType"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>FieldType</span> <span class='hs-keyglyph'>=</span>
<a name="line-35"></a> <span class='hs-conid'>StringT</span>
<a name="line-36"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>IntT</span>
<a name="line-37"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>IntegerT</span>
<a name="line-38"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DoubleT</span>
<a name="line-39"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BoolT</span>
<a name="line-40"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CalendarTimeT</span>
<a name="line-41"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BStrT</span> <span class='hs-conid'>Int</span>
<a name="line-42"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span><span class='hs-conid'>Ord</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span><span class='hs-conid'>Read</span><span class='hs-layout'>)</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="ExprType"></a><span class='hs-comment'>-- | Class which retrieves a field description from a given type.</span>
<a name="line-45"></a><a name="ExprType"></a><span class='hs-comment'>-- Instances are provided for most concrete types. Instances</span>
<a name="line-46"></a><a name="ExprType"></a><span class='hs-comment'>-- for Maybe automatically make the field nullable, and instances</span>
<a name="line-47"></a><a name="ExprType"></a><span class='hs-comment'>-- for all (Expr a) types where a has an ExprType instance allows</span>
<a name="line-48"></a><a name="ExprType"></a><span class='hs-comment'>-- type information to be recovered from a given column expression.</span>
<a name="line-49"></a><a name="ExprType"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>ExprType</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>where</span>
<a name="line-50"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FieldDesc</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="ExprTypes"></a><span class='hs-comment'>-- | Class which returns a list of field descriptions. Gets the</span>
<a name="line-53"></a><a name="ExprTypes"></a><span class='hs-comment'>-- descriptions of all columns in a Record/query. Most useful when</span>
<a name="line-54"></a><a name="ExprTypes"></a><span class='hs-comment'>-- the columns associated with each field in a (Rel r) type must be</span>
<a name="line-55"></a><a name="ExprTypes"></a><span class='hs-comment'>-- recovered. Note that this occurs at the type level only and no</span>
<a name="line-56"></a><a name="ExprTypes"></a><span class='hs-comment'>-- values are inspected.</span>
<a name="line-57"></a><a name="ExprTypes"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>ExprTypes</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>where</span>
<a name="line-58"></a> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FieldDesc</span><span class='hs-keyglyph'>]</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="toHaskellType"></a><span class='hs-definition'>toHaskellType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FieldType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-61"></a><span class='hs-definition'>toHaskellType</span> <span class='hs-conid'>StringT</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"String"</span>
<a name="line-62"></a><span class='hs-definition'>toHaskellType</span> <span class='hs-conid'>IntT</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Int"</span>
<a name="line-63"></a><span class='hs-definition'>toHaskellType</span> <span class='hs-conid'>IntegerT</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Integer"</span>
<a name="line-64"></a><span class='hs-definition'>toHaskellType</span> <span class='hs-conid'>DoubleT</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Double"</span>
<a name="line-65"></a><span class='hs-definition'>toHaskellType</span> <span class='hs-conid'>BoolT</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Bool"</span>
<a name="line-66"></a><span class='hs-definition'>toHaskellType</span> <span class='hs-conid'>CalendarTimeT</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"CalendarTime"</span>
<a name="line-67"></a><span class='hs-definition'>toHaskellType</span> <span class='hs-layout'>(</span><span class='hs-conid'>BStrT</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"BStr"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>a</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="queryFields"></a><span class='hs-comment'>-- | Given a query, returns a list of the field names and their</span>
<a name="line-70"></a><span class='hs-comment'>-- types used by the query. Useful for recovering field information</span>
<a name="line-71"></a><span class='hs-comment'>-- once a query has been built up. </span>
<a name="line-72"></a><span class='hs-definition'>queryFields</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ShowLabels</span> <span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-conid'>ExprTypes</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Query</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rel</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</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'>FieldDesc</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-73"></a><span class='hs-definition'>queryFields</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zip</span> <span class='hs-layout'>(</span><span class='hs-varid'>labels</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span> <span class='hs-varid'>types</span>
<a name="line-74"></a> <span class='hs-keyword'>where</span>
<a name="line-75"></a> <span class='hs-varid'>query</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unRel</span> <span class='hs-varop'>.</span> <span class='hs-varid'>snd</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runQueryRel</span> <span class='hs-varop'>$</span> <span class='hs-varid'>def</span>
<a name="line-76"></a> <span class='hs-varid'>types</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-varid'>query</span>
<a name="line-77"></a> <span class='hs-varid'>unRel</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rel</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span>
<a name="line-78"></a> <span class='hs-varid'>unRel</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span> <span class='hs-comment'>-- Only used to get to type-level information.</span>
<a name="line-79"></a>
<a name="line-80"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Typeable</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyword'>where</span> <span class='hs-comment'>-- not available in standard libraries</span>
<a name="line-81"></a> <span class='hs-varid'>typeOf</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkTyConApp</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkTyCon</span> <span class='hs-str'>"System.Time.CalendarTime"</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-82"></a>
<a name="line-83"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Typeable</span> <span class='hs-layout'>(</span><span class='hs-conid'>BoundedString</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-84"></a> <span class='hs-varid'>typeOf</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkTyConApp</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkTyCon</span> <span class='hs-str'>"Database.HaskellDB.BoundedString"</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-85"></a>
<a name="line-86"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExprType</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ExprType</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-87"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>fst</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromHaskellType</span> <span class='hs-varop'>$</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span>
<a name="line-88"></a>
<a name="line-89"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExprType</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ExprType</span> <span class='hs-layout'>(</span><span class='hs-conid'>Expr</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-90"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span>
<a name="line-91"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>unExpr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Expr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-92"></a> <span class='hs-varid'>unExpr</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-93"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>fromHaskellType</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unExpr</span> <span class='hs-varop'>$</span> <span class='hs-varid'>e</span>
<a name="line-94"></a>
<a name="line-95"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExprType</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ExprType</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rel</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-96"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span>
<a name="line-97"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>unRel</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Rel</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-98"></a> <span class='hs-varid'>unRel</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-99"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>fromHaskellType</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unRel</span> <span class='hs-varop'>$</span> <span class='hs-varid'>e</span>
<a name="line-100"></a>
<a name="line-101"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ExprType</span> <span class='hs-conid'>Bool</span> <span class='hs-keyword'>where</span>
<a name="line-102"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>BoolT</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-103"></a>
<a name="line-104"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ExprType</span> <span class='hs-conid'>String</span> <span class='hs-keyword'>where</span>
<a name="line-105"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>StringT</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-106"></a>
<a name="line-107"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ExprType</span> <span class='hs-conid'>Int</span> <span class='hs-keyword'>where</span>
<a name="line-108"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntT</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-109"></a>
<a name="line-110"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ExprType</span> <span class='hs-conid'>Integer</span> <span class='hs-keyword'>where</span>
<a name="line-111"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntegerT</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-112"></a>
<a name="line-113"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ExprType</span> <span class='hs-conid'>Double</span> <span class='hs-keyword'>where</span>
<a name="line-114"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>DoubleT</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-115"></a>
<a name="line-116"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ExprType</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyword'>where</span>
<a name="line-117"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>CalendarTimeT</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-118"></a>
<a name="line-119"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Size</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ExprType</span> <span class='hs-layout'>(</span><span class='hs-conid'>BoundedString</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-120"></a> <span class='hs-varid'>fromHaskellType</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>BStrT</span> <span class='hs-layout'>(</span><span class='hs-varid'>listBound</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-121"></a>
<a name="line-122"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ExprTypes</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyword'>where</span>
<a name="line-123"></a> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-124"></a>
<a name="line-125"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExprType</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>ExprTypes</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ExprTypes</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-varid'>e</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-126"></a> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-keyglyph'>~</span><span class='hs-varid'>f</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>e</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-127"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>getFieldType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-128"></a> <span class='hs-varid'>getFieldType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-129"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromHaskellType</span> <span class='hs-varop'>.</span> <span class='hs-varid'>getFieldType</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-varid'>r</span>
<a name="line-130"></a>
<a name="line-131"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExprTypes</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ExprTypes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Record</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-132"></a> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-conid'>RecNil</span><span class='hs-layout'>)</span>
<a name="line-133"></a>
<a name="line-134"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExprTypes</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ExprTypes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rel</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-135"></a> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span>
<a name="line-136"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>unRel</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Rel</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-137"></a> <span class='hs-varid'>unRel</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-138"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>fromHaskellTypes</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unRel</span> <span class='hs-varop'>$</span> <span class='hs-varid'>r</span>
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