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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies
<a name="line-2"></a> , TypeSynonymInstances, FlexibleInstances, UndecidableInstances
<a name="line-3"></a> , OverlappingInstances #-}</span>
<a name="line-4"></a><span class='hs-comment'>-----------------------------------------------------------</span>
<a name="line-5"></a><span class='hs-comment'>-- |</span>
<a name="line-6"></a><span class='hs-comment'>-- Module : HDBRec</span>
<a name="line-7"></a><span class='hs-comment'>-- Copyright : HWT Group (c) 2003, haskelldb-users@lists.sourceforge.net</span>
<a name="line-8"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-9"></a><span class='hs-comment'>-- </span>
<a name="line-10"></a><span class='hs-comment'>-- Maintainer : haskelldb-users@lists.sourceforge.net</span>
<a name="line-11"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-12"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-13"></a><span class='hs-comment'>-- </span>
<a name="line-14"></a><span class='hs-comment'>-- This is a replacement for some of TREX.</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'>HDBRec</span>
<a name="line-19"></a> <span class='hs-layout'>(</span>
<a name="line-20"></a> <span class='hs-comment'>-- * Record types</span>
<a name="line-21"></a> <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'>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>
<a name="line-22"></a> <span class='hs-comment'>-- * Record construction</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>emptyRecord</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>.=.</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span> <span class='hs-cpp'>#</span> <span class='hs-layout'>)</span>
<a name="line-24"></a> <span class='hs-comment'>-- * Labels</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>FieldTag</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-26"></a> <span class='hs-comment'>-- * Record predicates and operations</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>HasField</span><span class='hs-layout'>,</span> <span class='hs-conid'>Select</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'>SetField</span><span class='hs-layout'>,</span> <span class='hs-varid'>setField</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>RecCat</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-29"></a> <span class='hs-comment'>-- * Showing and reading records</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>ShowLabels</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'>ShowRecRow</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'>ReadRecRow</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-31"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>5</span> <span class='hs-cpp'>#</span>
<a name="line-36"></a><span class='hs-keyword'>infix</span> <span class='hs-num'>6</span> <span class='hs-varop'>.=.</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="RecNil"></a><span class='hs-comment'>-- | The empty record.</span>
<a name="line-39"></a><a name="RecNil"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RecNil</span> <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>
<a name="line-40"></a>
<a name="line-41"></a><a name="RecCons"></a><span class='hs-comment'>-- | Constructor that adds a field to a record.</span>
<a name="line-42"></a><a name="RecCons"></a><span class='hs-comment'>-- f is the field tag, a is the field value and b is the rest of the record.</span>
<a name="line-43"></a><a name="RecCons"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <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>
<a name="line-44"></a>
<a name="line-45"></a><a name="Record"></a><span class='hs-comment'>-- | The type used for records. This is a function</span>
<a name="line-46"></a><a name="Record"></a><span class='hs-comment'>-- that takes a 'RecNil' so that the user does not have to </span>
<a name="line-47"></a><a name="Record"></a><span class='hs-comment'>-- put a 'RecNil' at the end of every record.</span>
<a name="line-48"></a><a name="Record"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Record</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span>
<a name="line-49"></a>
<a name="line-50"></a><span class='hs-comment'>-- * Record construction</span>
<a name="line-51"></a>
<a name="line-52"></a>
<a name="line-53"></a><span class='hs-comment'>-- | Creates one-field record from a label and a value</span>
<a name="line-54"></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'>l</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ Label</span>
<a name="line-55"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ Value</span>
<a name="line-56"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Record</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-conid'>RecNil</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ New record</span>
<a name="line-57"></a><span class='hs-keyword'>_</span> <span class='hs-varop'>.=.</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>x</span>
<a name="line-58"></a>
<a name="line-59"></a><span class='hs-comment'>-- | Adds the field from a one-field record to another record.</span>
<a name="line-60"></a><span class='hs-layout'>(</span> <span class='hs-cpp'>#</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Record</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-conid'>RecNil</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Field to add</span>
<a name="line-61"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Rest of record</span>
<a name="line-62"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>b</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'>c</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ New record</span>
<a name="line-63"></a><a name="f"></a><span class='hs-definition'>f</span> <span class='hs-cpp'>#</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyword'>in</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-varid'>r</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="emptyRecord"></a><span class='hs-comment'>-- | The empty record</span>
<a name="line-66"></a><span class='hs-definition'>emptyRecord</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Record</span> <span class='hs-conid'>RecNil</span>
<a name="line-67"></a><span class='hs-definition'>emptyRecord</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>id</span>
<a name="line-68"></a>
<a name="line-69"></a><span class='hs-comment'>-- * Class definitions.</span>
<a name="line-70"></a>
<a name="line-71"></a><a name="HasField"></a><span class='hs-comment'>-- | Class for field labels.</span>
<a name="line-72"></a><a name="HasField"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>FieldTag</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>where</span>
<a name="line-73"></a> <span class='hs-comment'>-- | Gets the name of the label.</span>
<a name="line-74"></a> <span class='hs-varid'>fieldName</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-75"></a>
<a name="line-76"></a><a name="HasField"></a><span class='hs-comment'>-- | The record @r@ has the field @f@ if there is an instance of</span>
<a name="line-77"></a><a name="HasField"></a><span class='hs-comment'>-- @HasField f r@.</span>
<a name="line-78"></a><a name="HasField"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>HasField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span>
<a name="line-79"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasField</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</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-layout'>)</span>
<a name="line-80"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HasField</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-81"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HasField</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Record</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-82"></a>
<a name="line-83"></a><span class='hs-comment'>-- * Record concatenation</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="RecCat"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>RecCat</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>r3</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r3</span> <span class='hs-keyword'>where</span>
<a name="line-86"></a> <span class='hs-comment'>-- | Concatenates two records.</span>
<a name="line-87"></a> <span class='hs-varid'>recCat</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>r1</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r3</span>
<a name="line-88"></a>
<a name="line-89"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>RecCat</span> <span class='hs-conid'>RecNil</span> <span class='hs-varid'>r</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>where</span>
<a name="line-90"></a> <span class='hs-varid'>recCat</span> <span class='hs-keyglyph'>~</span><span class='hs-conid'>RecNil</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span>
<a name="line-91"></a>
<a name="line-92"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>RecCat</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>r3</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>RecCat</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>r1</span><span class='hs-layout'>)</span> <span class='hs-varid'>r2</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>r3</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-93"></a> <span class='hs-varid'>recCat</span> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>x</span> <span class='hs-varid'>r1</span><span class='hs-layout'>)</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>recCat</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span>
<a name="line-94"></a>
<a name="line-95"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>RecCat</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>r3</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>RecCat</span> <span class='hs-layout'>(</span><span class='hs-conid'>Record</span> <span class='hs-varid'>r1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Record</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Record</span> <span class='hs-varid'>r3</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-96"></a> <span class='hs-varid'>recCat</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>recCat</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>r2</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-97"></a>
<a name="line-98"></a><span class='hs-comment'>-- * Field selection</span>
<a name="line-99"></a>
<a name="line-100"></a><span class='hs-keyword'>infix</span> <span class='hs-num'>9</span> <span class='hs-varop'>!</span>
<a name="line-101"></a>
<a name="line-102"></a><a name="Select"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Select</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-103"></a> <span class='hs-comment'>-- | Field selection operator. It is overloaded so that</span>
<a name="line-104"></a> <span class='hs-comment'>-- users (read HaskellDB) can redefine it for things</span>
<a name="line-105"></a> <span class='hs-comment'>-- with phantom record types.</span>
<a name="line-106"></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'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-107"></a>
<a name="line-108"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SelectField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Select</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</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-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-109"></a> <span class='hs-layout'>(</span><span class='hs-varop'>!</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>selectField</span> <span class='hs-layout'>(</span><span class='hs-varid'>labelType</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="labelType"></a><span class='hs-definition'>labelType</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>l</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span>
<a name="line-112"></a><span class='hs-definition'>labelType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-113"></a>
<a name="line-114"></a><a name="SelectField"></a><span class='hs-comment'>-- | Class which does the actual work of </span>
<a name="line-115"></a><a name="SelectField"></a><span class='hs-comment'>-- getting the value of a field from a record.</span>
<a name="line-116"></a><a name="SelectField"></a><span class='hs-comment'>-- FIXME: would like the dependency f r -> a here, but</span>
<a name="line-117"></a><a name="SelectField"></a><span class='hs-comment'>-- that makes Hugs complain about conflicting instaces</span>
<a name="line-118"></a><a name="SelectField"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>SelectField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-119"></a> <span class='hs-comment'>-- | Gets the value of a field from a record.</span>
<a name="line-120"></a> <span class='hs-varid'>selectField</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>f</span> <span class='hs-comment'>-- ^ Field label</span>
<a name="line-121"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-comment'>-- ^ Record </span>
<a name="line-122"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ Field value</span>
<a name="line-123"></a>
<a name="line-124"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SelectField</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</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-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-125"></a> <span class='hs-varid'>selectField</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-126"></a>
<a name="line-127"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SelectField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SelectField</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-128"></a> <span class='hs-varid'>selectField</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-keyword'>_</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>selectField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span>
<a name="line-129"></a>
<a name="line-130"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SelectField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SelectField</span> <span class='hs-varid'>f</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-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-131"></a> <span class='hs-varid'>selectField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>selectField</span> <span class='hs-varid'>f</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-132"></a>
<a name="line-133"></a><span class='hs-comment'>-- * Field update</span>
<a name="line-134"></a>
<a name="line-135"></a><a name="setField"></a><span class='hs-definition'>setField</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SetField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>l</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span>
<a name="line-136"></a><span class='hs-definition'>setField</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setField_</span> <span class='hs-layout'>(</span><span class='hs-varid'>labelType</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-137"></a>
<a name="line-138"></a><a name="SetField"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>SetField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-139"></a> <span class='hs-comment'>-- | Sets the value of a field in a record.</span>
<a name="line-140"></a> <span class='hs-varid'>setField_</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>f</span> <span class='hs-comment'>-- ^ Field label</span>
<a name="line-141"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ New field value</span>
<a name="line-142"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-comment'>-- ^ Record</span>
<a name="line-143"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-comment'>-- ^ New record</span>
<a name="line-144"></a>
<a name="line-145"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SetField</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</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-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-146"></a> <span class='hs-varid'>setField_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>y</span> <span class='hs-varid'>r</span>
<a name="line-147"></a>
<a name="line-148"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SetField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SetField</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-149"></a> <span class='hs-varid'>setField_</span> <span class='hs-varid'>l</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RecCons</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>setField_</span> <span class='hs-varid'>l</span> <span class='hs-varid'>y</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-150"></a>
<a name="line-151"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SetField</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SetField</span> <span class='hs-varid'>f</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-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-152"></a> <span class='hs-varid'>setField_</span> <span class='hs-varid'>f</span> <span class='hs-varid'>y</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>setField_</span> <span class='hs-varid'>f</span> <span class='hs-varid'>y</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-153"></a>
<a name="line-154"></a><span class='hs-comment'>-- * Equality and ordering</span>
<a name="line-155"></a>
<a name="line-156"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</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-157"></a> <span class='hs-varid'>r1</span> <span class='hs-varop'>==</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r1</span> <span class='hs-conid'>RecNil</span> <span class='hs-varop'>==</span> <span class='hs-varid'>r2</span> <span class='hs-conid'>RecNil</span>
<a name="line-158"></a>
<a name="line-159"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</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-160"></a> <span class='hs-varid'>r1</span> <span class='hs-varop'><=</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r1</span> <span class='hs-conid'>RecNil</span> <span class='hs-varop'><=</span> <span class='hs-varid'>r2</span> <span class='hs-conid'>RecNil</span>
<a name="line-161"></a>
<a name="line-162"></a><span class='hs-comment'>-- * Showing labels</span>
<a name="line-163"></a>
<a name="line-164"></a><a name="consFieldName"></a><span class='hs-comment'>-- | Get the label name of a record entry.</span>
<a name="line-165"></a><span class='hs-definition'>consFieldName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FieldTag</span> <span class='hs-varid'>f</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-conid'>String</span>
<a name="line-166"></a><span class='hs-definition'>consFieldName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fieldName</span> <span class='hs-varop'>.</span> <span class='hs-varid'>consFieldType</span>
<a name="line-167"></a>
<a name="line-168"></a><a name="consFieldType"></a><span class='hs-definition'>consFieldType</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'>f</span>
<a name="line-169"></a><span class='hs-definition'>consFieldType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-170"></a>
<a name="line-171"></a><a name="ShowLabels"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>ShowLabels</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>where</span>
<a name="line-172"></a> <span class='hs-varid'>recordLabels</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'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-173"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ShowLabels</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyword'>where</span>
<a name="line-174"></a> <span class='hs-varid'>recordLabels</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-175"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>FieldTag</span> <span class='hs-varid'>f</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-keyglyph'>=></span> <span class='hs-conid'>ShowLabels</span> <span class='hs-layout'>(</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-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-176"></a> <span class='hs-varid'>recordLabels</span> <span class='hs-keyglyph'>~</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>consFieldName</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>recordLabels</span> <span class='hs-varid'>r</span>
<a name="line-177"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ShowLabels</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ShowLabels</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-178"></a> <span class='hs-varid'>recordLabels</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>recordLabels</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-179"></a>
<a name="line-180"></a><span class='hs-comment'>-- * Showing rows </span>
<a name="line-181"></a>
<a name="line-182"></a><a name="ShowRecRow"></a><span class='hs-comment'>-- | Convert a record to a list of label names and field values.</span>
<a name="line-183"></a><a name="ShowRecRow"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>ShowRecRow</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>where</span>
<a name="line-184"></a> <span class='hs-varid'>showRecRow</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-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>ShowS</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-185"></a>
<a name="line-186"></a><span class='hs-comment'>-- Last entry in each record will terminate the ShowrecRow recursion.</span>
<a name="line-187"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ShowRecRow</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyword'>where</span>
<a name="line-188"></a> <span class='hs-varid'>showRecRow</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-189"></a>
<a name="line-190"></a><span class='hs-comment'>-- Recurse a record and produce a showable tuple.</span>
<a name="line-191"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>FieldTag</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span>
<a name="line-192"></a> <span class='hs-conid'>Show</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span>
<a name="line-193"></a> <span class='hs-conid'>ShowRecRow</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ShowRecRow</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-194"></a> <span class='hs-varid'>showRecRow</span> <span class='hs-keyglyph'>~</span><span class='hs-varid'>r</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>x</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>consFieldName</span> <span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>shows</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>showRecRow</span> <span class='hs-varid'>fs</span>
<a name="line-195"></a>
<a name="line-196"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ShowRecRow</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ShowRecRow</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-197"></a> <span class='hs-varid'>showRecRow</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showRecRow</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-198"></a>
<a name="line-199"></a>
<a name="line-200"></a>
<a name="line-201"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Show</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-202"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>x</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>x</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-203"></a>
<a name="line-204"></a><a name="showsShowRecRow"></a><span class='hs-comment'>-- probably not terribly efficient</span>
<a name="line-205"></a><span class='hs-definition'>showsShowRecRow</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ShowRecRow</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ShowS</span>
<a name="line-206"></a><span class='hs-definition'>showsShowRecRow</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shows</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>f</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span> <span class='hs-str'>""</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>showRecRow</span> <span class='hs-varid'>r</span><span class='hs-keyglyph'>]</span>
<a name="line-207"></a>
<a name="line-208"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyword'>where</span>
<a name="line-209"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showsShowRecRow</span> <span class='hs-varid'>r</span>
<a name="line-210"></a>
<a name="line-211"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>FieldTag</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>ShowRecRow</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Show</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-212"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showsShowRecRow</span> <span class='hs-varid'>r</span>
<a name="line-213"></a>
<a name="line-214"></a>
<a name="line-215"></a><span class='hs-comment'>-- * Reading rows</span>
<a name="line-216"></a>
<a name="line-217"></a><a name="ReadRecRow"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>ReadRecRow</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>where</span>
<a name="line-218"></a> <span class='hs-comment'>-- | Convert a list of labels and strins representating values</span>
<a name="line-219"></a> <span class='hs-comment'>-- to a record.</span>
<a name="line-220"></a> <span class='hs-varid'>readRecRow</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-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-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-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-221"></a>
<a name="line-222"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ReadRecRow</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyword'>where</span>
<a name="line-223"></a> <span class='hs-varid'>readRecRow</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>RecNil</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-224"></a>
<a name="line-225"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>FieldTag</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span>
<a name="line-226"></a> <span class='hs-conid'>Read</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span>
<a name="line-227"></a> <span class='hs-conid'>ReadRecRow</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ReadRecRow</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-228"></a> <span class='hs-varid'>readRecRow</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-229"></a> <span class='hs-varid'>readRecRow</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readRecEntry</span> <span class='hs-varid'>xs</span> <span class='hs-layout'>(</span><span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>head</span> <span class='hs-varid'>res</span><span class='hs-layout'>)</span> <span class='hs-keyword'>in</span> <span class='hs-varid'>res</span>
<a name="line-230"></a>
<a name="line-231"></a><a name="readRecEntry"></a><span class='hs-definition'>readRecEntry</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>FieldTag</span> <span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-conid'>ReadRecRow</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-232"></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>
<a name="line-233"></a> <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-comment'>-- ^ Dummy to get return type right</span>
<a name="line-234"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</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-layout'>,</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-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-235"></a><span class='hs-definition'>readRecEntry</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-varid'>v</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>f</span> <span class='hs-varop'>==</span> <span class='hs-varid'>consFieldName</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>res</span>
<a name="line-236"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-237"></a> <span class='hs-keyword'>where</span>
<a name="line-238"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>x</span> <span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>xs'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-str'>""</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>reads</span> <span class='hs-varid'>v</span><span class='hs-layout'>,</span>
<a name="line-239"></a> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span><span class='hs-varid'>xs'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readRecRow</span> <span class='hs-varid'>xs</span><span class='hs-keyglyph'>]</span>
<a name="line-240"></a>
<a name="line-241"></a>
<a name="line-242"></a><a name="readsReadRecRow"></a><span class='hs-definition'>readsReadRecRow</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadRecRow</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ReadS</span> <span class='hs-varid'>r</span>
<a name="line-243"></a><span class='hs-definition'>readsReadRecRow</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span><span class='hs-varid'>leftOver</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>leftOver</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>reads</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readRecRow</span> <span class='hs-varid'>l</span><span class='hs-keyglyph'>]</span>
<a name="line-244"></a>
<a name="line-245"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ReadRecRow</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Read</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-246"></a> <span class='hs-varid'>readsPrec</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>rs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readsReadRecRow</span> <span class='hs-varid'>s</span><span class='hs-keyglyph'>]</span>
<a name="line-247"></a>
<a name="line-248"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Read</span> <span class='hs-conid'>RecNil</span> <span class='hs-keyword'>where</span>
<a name="line-249"></a> <span class='hs-varid'>readsPrec</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readsReadRecRow</span>
<a name="line-250"></a>
<a name="line-251"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>FieldTag</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>ReadRecRow</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Read</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-252"></a> <span class='hs-varid'>readsPrec</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readsReadRecRow</span> <span class='hs-varid'>s</span>
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