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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE PatternGuards #-}</span>
<a name="line-2"></a><span class='hs-comment'>--------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Text.JSON.Generic</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Lennart Augustsson, 2008-2009</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD3</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer: Sigbjorn Finne <sof@galois.com></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability: portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- JSON serializer and deserializer using Data.Generics.</span>
<a name="line-13"></a><span class='hs-comment'>-- The functions here handle algebraic data types and primitive types.</span>
<a name="line-14"></a><span class='hs-comment'>-- It uses the same representation as "Text.JSON" for "Prelude" types.</span>
<a name="line-15"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>JSON</span><span class='hs-varop'>.</span><span class='hs-conid'>Generic</span>
<a name="line-16"></a> <span class='hs-layout'>(</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>JSON</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Data</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toJSON</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromJSON</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>encodeJSON</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>decodeJSON</span>
<a name="line-23"></a>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toJSON_generic</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromJSON_generic</span>
<a name="line-26"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-27"></a>
<a name="line-28"></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'>State</span>
<a name="line-29"></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'>Identity</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>JSON</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>JSON</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span> <span class='hs-layout'>(</span> <span class='hs-varid'>runGetJSON</span> <span class='hs-layout'>)</span>
<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'>Generics</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>L</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IntSet</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>I</span>
<a name="line-40"></a><span class='hs-comment'>-- FIXME: The JSON library treats this specially, needs ext2Q</span>
<a name="line-41"></a><span class='hs-comment'>-- import qualified Data.Map as M</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="T"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>T</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-conid'>JSValue</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="toJSON"></a><span class='hs-comment'>-- |Convert anything to a JSON value.</span>
<a name="line-46"></a><span class='hs-definition'>toJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>JSValue</span>
<a name="line-47"></a><span class='hs-definition'>toJSON</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toJSON_generic</span>
<a name="line-48"></a> <span class='hs-varop'>`ext1Q`</span> <span class='hs-varid'>jList</span>
<a name="line-49"></a> <span class='hs-comment'>-- Use the standard encoding for all base types.</span>
<a name="line-50"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Integer</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-52"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Word8</span><span class='hs-layout'>)</span>
<a name="line-53"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Word16</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Word32</span><span class='hs-layout'>)</span>
<a name="line-55"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Word64</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Int8</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Int16</span><span class='hs-layout'>)</span>
<a name="line-58"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Int32</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Int64</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Double</span><span class='hs-layout'>)</span>
<a name="line-61"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Float</span><span class='hs-layout'>)</span>
<a name="line-62"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-63"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-comment'>-- Bool has a special encoding.</span>
<a name="line-65"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-66"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-67"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>Ordering</span><span class='hs-layout'>)</span>
<a name="line-68"></a> <span class='hs-comment'>-- More special cases.</span>
<a name="line-69"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IntSet</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-varop'>`extQ`</span> <span class='hs-layout'>(</span><span class='hs-varid'>showJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-keyword'>where</span>
<a name="line-73"></a> <span class='hs-comment'>-- Lists are simply coded as arrays.</span>
<a name="line-74"></a> <span class='hs-varid'>jList</span> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSArray</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>toJSON</span> <span class='hs-varid'>vs</span>
<a name="line-75"></a>
<a name="line-76"></a>
<a name="line-77"></a><a name="toJSON_generic"></a><span class='hs-definition'>toJSON_generic</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>JSValue</span>
<a name="line-78"></a><span class='hs-definition'>toJSON_generic</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>generic</span>
<a name="line-79"></a> <span class='hs-keyword'>where</span>
<a name="line-80"></a> <span class='hs-comment'>-- Generic encoding of an algebraic data type.</span>
<a name="line-81"></a> <span class='hs-comment'>-- No constructor, so it must be an error value. Code it anyway as JSNull.</span>
<a name="line-82"></a> <span class='hs-comment'>-- Elide a single constructor and just code the arguments.</span>
<a name="line-83"></a> <span class='hs-comment'>-- For multiple constructors, make an object with a field name that is the</span>
<a name="line-84"></a> <span class='hs-comment'>-- constructor (except lower case) and the data is the arguments encoded.</span>
<a name="line-85"></a> <span class='hs-varid'>generic</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-86"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>dataTypeRep</span> <span class='hs-layout'>(</span><span class='hs-varid'>dataTypeOf</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-87"></a> <span class='hs-conid'>AlgRep</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>JSNull</span>
<a name="line-88"></a> <span class='hs-conid'>AlgRep</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>encodeArgs</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>gmapQ</span> <span class='hs-varid'>toJSON</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-89"></a> <span class='hs-conid'>AlgRep</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>encodeConstr</span> <span class='hs-layout'>(</span><span class='hs-varid'>toConstr</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gmapQ</span> <span class='hs-varid'>toJSON</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-90"></a> <span class='hs-varid'>rep</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-layout'>(</span><span class='hs-varid'>dataTypeOf</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>rep</span>
<a name="line-91"></a> <span class='hs-keyword'>where</span>
<a name="line-92"></a> <span class='hs-varid'>err</span> <span class='hs-varid'>dt</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"toJSON: not AlgRep "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>r</span> <span class='hs-varop'>++</span> <span class='hs-str'>"("</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>dt</span> <span class='hs-varop'>++</span> <span class='hs-str'>")"</span>
<a name="line-93"></a> <span class='hs-comment'>-- Encode nullary constructor as a string.</span>
<a name="line-94"></a> <span class='hs-comment'>-- Encode non-nullary constructors as an object with the constructor</span>
<a name="line-95"></a> <span class='hs-comment'>-- name as the single field and the arguments as the value.</span>
<a name="line-96"></a> <span class='hs-comment'>-- Use an array if the are no field names, but elide singleton arrays,</span>
<a name="line-97"></a> <span class='hs-comment'>-- and use an object if there are field names.</span>
<a name="line-98"></a> <span class='hs-varid'>encodeConstr</span> <span class='hs-varid'>c</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSString</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toJSString</span> <span class='hs-varop'>$</span> <span class='hs-varid'>constrString</span> <span class='hs-varid'>c</span>
<a name="line-99"></a> <span class='hs-varid'>encodeConstr</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>as</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>jsObject</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>constrString</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>encodeArgs</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-100"></a>
<a name="line-101"></a> <span class='hs-varid'>constrString</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showConstr</span>
<a name="line-102"></a>
<a name="line-103"></a> <span class='hs-varid'>encodeArgs</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>encodeArgs'</span> <span class='hs-layout'>(</span><span class='hs-varid'>constrFields</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-104"></a> <span class='hs-varid'>encodeArgs'</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>j</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>j</span>
<a name="line-105"></a> <span class='hs-varid'>encodeArgs'</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>js</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSArray</span> <span class='hs-varid'>js</span>
<a name="line-106"></a> <span class='hs-varid'>encodeArgs'</span> <span class='hs-varid'>ns</span> <span class='hs-varid'>js</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>jsObject</span> <span class='hs-varop'>$</span> <span class='hs-varid'>zip</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>mungeField</span> <span class='hs-varid'>ns</span><span class='hs-layout'>)</span> <span class='hs-varid'>js</span>
<a name="line-107"></a>
<a name="line-108"></a> <span class='hs-comment'>-- Skip leading '_' in field name so we can use keywords etc. as field names.</span>
<a name="line-109"></a> <span class='hs-varid'>mungeField</span> <span class='hs-layout'>(</span><span class='hs-chr'>'_'</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cs</span>
<a name="line-110"></a> <span class='hs-varid'>mungeField</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cs</span>
<a name="line-111"></a>
<a name="line-112"></a> <span class='hs-varid'>jsObject</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'>JSValue</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>JSValue</span>
<a name="line-113"></a> <span class='hs-varid'>jsObject</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSObject</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toJSObject</span>
<a name="line-114"></a>
<a name="line-115"></a>
<a name="line-116"></a><a name="F"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>F</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Result</span> <span class='hs-varid'>a</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="fromJSON"></a><span class='hs-comment'>-- |Convert a JSON value to anything (fails if the types do not match).</span>
<a name="line-119"></a><span class='hs-definition'>fromJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>JSValue</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Result</span> <span class='hs-varid'>a</span>
<a name="line-120"></a><span class='hs-definition'>fromJSON</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromJSON_generic</span> <span class='hs-varid'>j</span>
<a name="line-121"></a> <span class='hs-varop'>`ext1R`</span> <span class='hs-varid'>jList</span>
<a name="line-122"></a> <span class='hs-comment'>--</span>
<a name="line-123"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Integer</span><span class='hs-layout'>)</span>
<a name="line-124"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-125"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Word8</span><span class='hs-layout'>)</span>
<a name="line-126"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Word16</span><span class='hs-layout'>)</span>
<a name="line-127"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Word32</span><span class='hs-layout'>)</span>
<a name="line-128"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Word64</span><span class='hs-layout'>)</span>
<a name="line-129"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Int8</span><span class='hs-layout'>)</span>
<a name="line-130"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Int16</span><span class='hs-layout'>)</span>
<a name="line-131"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Int32</span><span class='hs-layout'>)</span>
<a name="line-132"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Int64</span><span class='hs-layout'>)</span>
<a name="line-133"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Double</span><span class='hs-layout'>)</span>
<a name="line-134"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Float</span><span class='hs-layout'>)</span>
<a name="line-135"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-136"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-137"></a> <span class='hs-comment'>--</span>
<a name="line-138"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-139"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-140"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>Ordering</span><span class='hs-layout'>)</span>
<a name="line-141"></a> <span class='hs-comment'>--</span>
<a name="line-142"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IntSet</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-144"></a> <span class='hs-varop'>`extR`</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>F</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-145"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSON</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Result</span> <span class='hs-varid'>a</span>
<a name="line-146"></a> <span class='hs-varid'>value</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readJSON</span> <span class='hs-varid'>j</span>
<a name="line-147"></a>
<a name="line-148"></a> <span class='hs-varid'>jList</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Result</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>e</span><span class='hs-keyglyph'>]</span>
<a name="line-149"></a> <span class='hs-varid'>jList</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>j</span> <span class='hs-keyword'>of</span>
<a name="line-150"></a> <span class='hs-conid'>JSArray</span> <span class='hs-varid'>js</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>fromJSON</span> <span class='hs-varid'>js</span>
<a name="line-151"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"fromJSON: Prelude.[] bad data: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>j</span>
<a name="line-152"></a>
<a name="line-153"></a>
<a name="line-154"></a>
<a name="line-155"></a><a name="fromJSON_generic"></a><span class='hs-definition'>fromJSON_generic</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>JSValue</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Result</span> <span class='hs-varid'>a</span>
<a name="line-156"></a><span class='hs-definition'>fromJSON_generic</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>generic</span>
<a name="line-157"></a> <span class='hs-keyword'>where</span>
<a name="line-158"></a> <span class='hs-varid'>typ</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dataTypeOf</span> <span class='hs-varop'>$</span> <span class='hs-varid'>resType</span> <span class='hs-varid'>generic</span>
<a name="line-159"></a> <span class='hs-varid'>generic</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>dataTypeRep</span> <span class='hs-varid'>typ</span> <span class='hs-keyword'>of</span>
<a name="line-160"></a> <span class='hs-conid'>AlgRep</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>j</span> <span class='hs-keyword'>of</span> <span class='hs-conid'>JSNull</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"Empty type"</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"fromJSON: no-constr bad data"</span>
<a name="line-161"></a> <span class='hs-conid'>AlgRep</span> <span class='hs-keyglyph'>[</span><span class='hs-keyword'>_</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>decodeArgs</span> <span class='hs-layout'>(</span><span class='hs-varid'>indexConstr</span> <span class='hs-varid'>typ</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>j</span>
<a name="line-162"></a> <span class='hs-conid'>AlgRep</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>j'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getConstr</span> <span class='hs-varid'>typ</span> <span class='hs-varid'>j</span><span class='hs-layout'>;</span> <span class='hs-varid'>decodeArgs</span> <span class='hs-varid'>c</span> <span class='hs-varid'>j'</span>
<a name="line-163"></a> <span class='hs-varid'>rep</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"fromJSON: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>rep</span> <span class='hs-varop'>++</span> <span class='hs-str'>"("</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>typ</span> <span class='hs-varop'>++</span> <span class='hs-str'>")"</span>
<a name="line-164"></a> <span class='hs-varid'>getConstr</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSObject</span> <span class='hs-varid'>o</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>j'</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromJSObject</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readConstr'</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>j'</span><span class='hs-layout'>)</span>
<a name="line-165"></a> <span class='hs-varid'>getConstr</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSString</span> <span class='hs-varid'>js</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readConstr'</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromJSString</span> <span class='hs-varid'>js</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-conid'>JSNull</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- handle nullare constructor</span>
<a name="line-166"></a> <span class='hs-varid'>getConstr</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Error</span> <span class='hs-str'>"fromJSON: bad constructor encoding"</span>
<a name="line-167"></a> <span class='hs-varid'>readConstr'</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span>
<a name="line-168"></a> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"fromJSON: unknown constructor: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-str'>" "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>readConstr</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span>
<a name="line-170"></a>
<a name="line-171"></a> <span class='hs-varid'>decodeArgs</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decodeArgs'</span> <span class='hs-layout'>(</span><span class='hs-varid'>numConstrArgs</span> <span class='hs-layout'>(</span><span class='hs-varid'>resType</span> <span class='hs-varid'>generic</span><span class='hs-layout'>)</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>constrFields</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-172"></a> <span class='hs-varid'>decodeArgs'</span> <span class='hs-num'>0</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>JSNull</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>construct</span> <span class='hs-varid'>c</span> <span class='hs-conid'>[]</span> <span class='hs-comment'>-- nullary constructor</span>
<a name="line-173"></a> <span class='hs-varid'>decodeArgs'</span> <span class='hs-num'>1</span> <span class='hs-varid'>c</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>jd</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>construct</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>jd</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- unary constructor</span>
<a name="line-174"></a> <span class='hs-varid'>decodeArgs'</span> <span class='hs-varid'>n</span> <span class='hs-varid'>c</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSArray</span> <span class='hs-varid'>js</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>></span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>construct</span> <span class='hs-varid'>c</span> <span class='hs-varid'>js</span> <span class='hs-comment'>-- no field names</span>
<a name="line-175"></a> <span class='hs-comment'>-- FIXME? We could allow reading an array into a constructor with field names.</span>
<a name="line-176"></a> <span class='hs-varid'>decodeArgs'</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>c</span> <span class='hs-varid'>fs</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSObject</span> <span class='hs-varid'>o</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>selectFields</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromJSObject</span> <span class='hs-varid'>o</span><span class='hs-layout'>)</span> <span class='hs-varid'>fs</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>construct</span> <span class='hs-varid'>c</span> <span class='hs-comment'>-- field names</span>
<a name="line-177"></a> <span class='hs-varid'>decodeArgs'</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>jd</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"fromJSON: bad decodeArgs data "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>jd</span><span class='hs-layout'>)</span>
<a name="line-178"></a>
<a name="line-179"></a> <span class='hs-comment'>-- Build the value by stepping through the list of subparts.</span>
<a name="line-180"></a> <span class='hs-varid'>construct</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>evalStateT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromConstrM</span> <span class='hs-varid'>f</span> <span class='hs-varid'>c</span>
<a name="line-181"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>StateT</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>JSValue</span><span class='hs-keyglyph'>]</span> <span class='hs-conid'>Result</span> <span class='hs-varid'>a</span>
<a name="line-182"></a> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>js</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get</span><span class='hs-layout'>;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>js</span> <span class='hs-keyword'>of</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Error</span> <span class='hs-str'>"construct: empty list"</span><span class='hs-layout'>;</span> <span class='hs-varid'>j'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>js'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>put</span> <span class='hs-varid'>js'</span><span class='hs-layout'>;</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromJSON</span> <span class='hs-varid'>j'</span>
<a name="line-183"></a>
<a name="line-184"></a> <span class='hs-comment'>-- Select the named fields from a JSON object. FIXME? Should this use a map?</span>
<a name="line-185"></a> <span class='hs-varid'>selectFields</span> <span class='hs-varid'>fjs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>sel</span>
<a name="line-186"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>sel</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"fromJSON: field does not exist "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-conid'>Ok</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>f</span> <span class='hs-varid'>fjs</span>
<a name="line-187"></a>
<a name="line-188"></a> <span class='hs-comment'>-- Count how many arguments a constructor has. The value x is used to determine what type the constructor returns.</span>
<a name="line-189"></a> <span class='hs-varid'>numConstrArgs</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Constr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-190"></a> <span class='hs-varid'>numConstrArgs</span> <span class='hs-varid'>x</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>execState</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromConstrM</span> <span class='hs-varid'>f</span> <span class='hs-varid'>c</span> <span class='hs-varop'>`asTypeOf`</span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span>
<a name="line-191"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>modify</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-varid'>undefined</span>
<a name="line-192"></a>
<a name="line-193"></a> <span class='hs-varid'>resType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Result</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-194"></a> <span class='hs-varid'>resType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"resType"</span>
<a name="line-195"></a>
<a name="line-196"></a><a name="encodeJSON"></a><span class='hs-comment'>-- |Encode a value as a string.</span>
<a name="line-197"></a><span class='hs-definition'>encodeJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-198"></a><span class='hs-definition'>encodeJSON</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showJSValue</span> <span class='hs-layout'>(</span><span class='hs-varid'>toJSON</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span>
<a name="line-199"></a>
<a name="line-200"></a><a name="decodeJSON"></a><span class='hs-comment'>-- |Decode a string as a value.</span>
<a name="line-201"></a><span class='hs-definition'>decodeJSON</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-202"></a><span class='hs-definition'>decodeJSON</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span>
<a name="line-203"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>runGetJSON</span> <span class='hs-varid'>readJSValue</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-204"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-varid'>msg</span>
<a name="line-205"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>-></span>
<a name="line-206"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>fromJSON</span> <span class='hs-varid'>j</span> <span class='hs-keyword'>of</span>
<a name="line-207"></a> <span class='hs-conid'>Error</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-varid'>msg</span>
<a name="line-208"></a> <span class='hs-conid'>Ok</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
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