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<pre><a name="line-1"></a><span class='hs-comment'>-- |</span>
<a name="line-2"></a><span class='hs-comment'>-- Module: Control.Wire.Unsafe.Event</span>
<a name="line-3"></a><span class='hs-comment'>-- Copyright: (c) 2013 Ertugrul Soeylemez</span>
<a name="line-4"></a><span class='hs-comment'>-- License: BSD3</span>
<a name="line-5"></a><span class='hs-comment'>-- Maintainer: Ertugrul Soeylemez <es@ertes.de></span>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Wire</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span><span class='hs-varop'>.</span><span class='hs-conid'>Event</span>
<a name="line-8"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Events</span>
<a name="line-9"></a> <span class='hs-conid'>Event</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-10"></a>
<a name="line-11"></a> <span class='hs-comment'>-- * Helper functions</span>
<a name="line-12"></a> <span class='hs-varid'>event</span><span class='hs-layout'>,</span>
<a name="line-13"></a> <span class='hs-varid'>merge</span><span class='hs-layout'>,</span>
<a name="line-14"></a> <span class='hs-varid'>occurred</span><span class='hs-layout'>,</span>
<a name="line-15"></a> <span class='hs-varid'>onEventM</span>
<a name="line-16"></a> <span class='hs-layout'>)</span>
<a name="line-17"></a> <span class='hs-keyword'>where</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>DeepSeq</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Wire</span><span class='hs-varop'>.</span><span class='hs-conid'>Core</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Semigroup</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Typeable</span>
<a name="line-24"></a>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-comment'>-- | Denotes a stream of values, each together with time of occurrence.</span>
<a name="line-27"></a><span class='hs-comment'>-- Since 'Event' is commonly used for functional reactive programming it</span>
<a name="line-28"></a><span class='hs-comment'>-- does not define most of the usual instances to protect continuous</span>
<a name="line-29"></a><span class='hs-comment'>-- time and discrete event occurrence semantics.</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="Event"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Event</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>NoEvent</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="instance%20Functor%20Event"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-conid'>Event</span> <span class='hs-keyword'>where</span>
<a name="line-34"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>event</span> <span class='hs-conid'>NoEvent</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="instance%20Monoid%20(Event%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Semigroup</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-37"></a> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NoEvent</span>
<a name="line-38"></a> <span class='hs-varid'>mappend</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'><></span><span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="instance%20NFData%20(Event%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>NFData</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>NFData</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-41"></a> <span class='hs-varid'>rnf</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rnf</span> <span class='hs-varid'>x</span>
<a name="line-42"></a> <span class='hs-varid'>rnf</span> <span class='hs-conid'>NoEvent</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>()</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="instance%20Semigroup%20(Event%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Semigroup</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Semigroup</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-45"></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'>merge</span> <span class='hs-layout'>(</span><span class='hs-varop'><></span><span class='hs-layout'>)</span>
<a name="line-46"></a>
<a name="line-47"></a>
<a name="line-48"></a><span class='hs-comment'>-- | Fold the given event.</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="event"></a><span class='hs-definition'>event</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-51"></a><span class='hs-definition'>event</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>j</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>j</span> <span class='hs-varid'>x</span>
<a name="line-52"></a><span class='hs-definition'>event</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>NoEvent</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span>
<a name="line-53"></a>
<a name="line-54"></a>
<a name="line-55"></a><span class='hs-comment'>-- | Merge two events using the given function when both occur at the</span>
<a name="line-56"></a><span class='hs-comment'>-- same time.</span>
<a name="line-57"></a>
<a name="line-58"></a><a name="merge"></a><span class='hs-definition'>merge</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-varid'>a</span>
<a name="line-59"></a><span class='hs-definition'>merge</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>NoEvent</span> <span class='hs-conid'>NoEvent</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NoEvent</span>
<a name="line-60"></a><span class='hs-definition'>merge</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-conid'>NoEvent</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-varid'>x</span>
<a name="line-61"></a><span class='hs-definition'>merge</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>NoEvent</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-varid'>y</span>
<a name="line-62"></a><span class='hs-definition'>merge</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-63"></a>
<a name="line-64"></a>
<a name="line-65"></a><span class='hs-comment'>-- | Did the given event occur?</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="occurred"></a><span class='hs-definition'>occurred</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Event</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-68"></a><span class='hs-definition'>occurred</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>event</span> <span class='hs-conid'>False</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span>
<a name="line-69"></a>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-comment'>-- | Each time the given event occurs, perform the given action with the</span>
<a name="line-72"></a><span class='hs-comment'>-- value the event carries. The resulting event carries the result of</span>
<a name="line-73"></a><span class='hs-comment'>-- the action.</span>
<a name="line-74"></a><span class='hs-comment'>--</span>
<a name="line-75"></a><span class='hs-comment'>-- * Depends: now.</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="onEventM"></a><span class='hs-definition'>onEventM</span> <span class='hs-keyglyph'>::</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-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Wire</span> <span class='hs-varid'>s</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-78"></a><span class='hs-definition'>onEventM</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkGen_</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>.</span> <span class='hs-varid'>event</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>NoEvent</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftM</span> <span class='hs-conid'>Event</span> <span class='hs-varop'>.</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
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