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<title>src/full/Agda/TypeChecking/Monad/Exception.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances, UndecidableInstances #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- | Basically a copy of the ErrorT monad transformer. It's handy to slap</span>
<a name="line-4"></a><span class='hs-comment'>-- onto TCM and still be a MonadTCM (which isn't possible with ErrorT).</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-comment'>-- Andreas, 2012-03-30: the following command seems to be STALE.</span>
<a name="line-7"></a><span class='hs-comment'>-- Also, it does not require the silly Error instance for the err type.</span>
<a name="line-8"></a><span class='hs-comment'>-- The silly Error instance is back. ;-)</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeChecking</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>where</span>
<a name="line-11"></a>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-13"></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'>Error</span>
<a name="line-14"></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-15"></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'>Reader</span>
<a name="line-16"></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'>Writer</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeChecking</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span>
<a name="line-18"></a>
<a name="line-19"></a><a name="ExceptionT"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runExceptionT</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>err</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-20"></a>
<a name="line-21"></a><a name="MonadException"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Error</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadException</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-keyword'>where</span>
<a name="line-22"></a> <span class='hs-varid'>throwException</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-23"></a> <span class='hs-varid'>catchException</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-24"></a>
<a name="line-25"></a><a name="instance%20Monad%20(ExceptionT%20err%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Error</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Right</span>
<a name="line-27"></a> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-28"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m</span>
<a name="line-29"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-30"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-31"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>k</span> <span class='hs-varid'>x</span>
<a name="line-32"></a> <span class='hs-varid'>fail</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Left</span> <span class='hs-varop'>.</span> <span class='hs-varid'>strMsg</span>
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<a name="line-34"></a><a name="instance%20MonadException%20err%20(ExceptionT%20err%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Error</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadException</span> <span class='hs-varid'>err</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-35"></a> <span class='hs-varid'>throwException</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Left</span>
<a name="line-36"></a> <span class='hs-varid'>catchException</span> <span class='hs-varid'>m</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-37"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runExceptionT</span> <span class='hs-varid'>m</span>
<a name="line-38"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-39"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>h</span> <span class='hs-varid'>err</span>
<a name="line-40"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>x</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="instance%20MonadException%20err%20(ReaderT%20r%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadException</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadException</span> <span class='hs-varid'>err</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-43"></a> <span class='hs-varid'>throwException</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwException</span>
<a name="line-44"></a> <span class='hs-varid'>catchException</span> <span class='hs-varid'>m</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span>
<a name="line-45"></a> <span class='hs-varid'>catchException</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varop'>`runReaderT`</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>h</span> <span class='hs-varid'>err</span> <span class='hs-varop'>`runReaderT`</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="instance%20MonadException%20err%20(WriterT%20w%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadException</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadException</span> <span class='hs-varid'>err</span> <span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-48"></a> <span class='hs-varid'>throwException</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwException</span>
<a name="line-49"></a> <span class='hs-varid'>catchException</span> <span class='hs-varid'>m</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span>
<a name="line-50"></a> <span class='hs-varid'>catchException</span> <span class='hs-layout'>(</span><span class='hs-varid'>runWriterT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runWriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>h</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="instance%20MonadTrans%20(ExceptionT%20err)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTrans</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-53"></a> <span class='hs-varid'>lift</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>Right</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="instance%20Functor%20(ExceptionT%20err%20f)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-56"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>either</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptionT</span>
<a name="line-57"></a>
<a name="line-58"></a><a name="instance%20Applicative%20(ExceptionT%20err%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>err</span><span class='hs-layout'>,</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Applicative</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-59"></a> <span class='hs-varid'>pure</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span>
<a name="line-60"></a> <span class='hs-layout'>(</span><span class='hs-varop'><*></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ap</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="instance%20MonadState%20s%20(ExceptionT%20err%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>err</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-63"></a> <span class='hs-varid'>get</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>get</span>
<a name="line-64"></a> <span class='hs-varid'>put</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>put</span> <span class='hs-varid'>x</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="instance%20MonadReader%20r%20(ExceptionT%20err%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>err</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadReader</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadReader</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-67"></a> <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>ask</span>
<a name="line-68"></a> <span class='hs-varid'>local</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>local</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptionT</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="instance%20MonadError%20err'%20(ExceptionT%20err%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>err</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadError</span> <span class='hs-varid'>err'</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadError</span> <span class='hs-varid'>err'</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-71"></a> <span class='hs-varid'>throwError</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>throwError</span> <span class='hs-varid'>err</span>
<a name="line-72"></a> <span class='hs-varid'>catchError</span> <span class='hs-varid'>m</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runExceptionT</span> <span class='hs-varid'>m</span> <span class='hs-varop'>`catchError`</span> <span class='hs-layout'>(</span><span class='hs-varid'>runExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="instance%20MonadIO%20(ExceptionT%20err%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>err</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-75"></a> <span class='hs-varid'>liftIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>liftIO</span> <span class='hs-varid'>m</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="instance%20MonadTCM%20(ExceptionT%20err%20tcm)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>err</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadTCM</span> <span class='hs-varid'>tcm</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadTCM</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>err</span> <span class='hs-varid'>tcm</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-78"></a> <span class='hs-varid'>liftTCM</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>liftTCM</span> <span class='hs-varid'>m</span>
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