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<title>src/Language/Haskell/Exts/ExtScheme.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</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 : Language.Haskell.Exts.ExtScheme</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Niklas Broberg 2009</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE.txt)</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : Niklas Broberg, d00nibro@chalmers.se</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : stable</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'>-- Internal scheme for handling extensions in a</span>
<a name="line-13"></a><span class='hs-comment'>-- convenient fashion.</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-16"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span><span class='hs-varop'>.</span><span class='hs-conid'>ExtScheme</span> <span class='hs-keyword'>where</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span><span class='hs-varop'>.</span><span class='hs-conid'>Extension</span>
<a name="line-19"></a>
<a name="line-20"></a><a name="ExtScheme"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ExtScheme</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Any</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Extension</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>All</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Extension</span><span class='hs-keyglyph'>]</span>
<a name="line-21"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-22"></a>
<a name="line-23"></a><a name="MExtScheme"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>MExtScheme</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>ExtScheme</span>
<a name="line-24"></a>
<a name="line-25"></a><a name="Enabled"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Enabled</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a> <span class='hs-varid'>isEnabled</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Extension</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Enabled</span> <span class='hs-conid'>Extension</span> <span class='hs-keyword'>where</span>
<a name="line-29"></a> <span class='hs-varid'>isEnabled</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>elem</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Enabled</span> <span class='hs-conid'>ExtScheme</span> <span class='hs-keyword'>where</span>
<a name="line-32"></a> <span class='hs-varid'>isEnabled</span> <span class='hs-layout'>(</span><span class='hs-conid'>Any</span> <span class='hs-varid'>exts</span><span class='hs-layout'>)</span> <span class='hs-varid'>enabled</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>any</span> <span class='hs-layout'>(</span><span class='hs-varop'>`elem`</span> <span class='hs-varid'>enabled</span><span class='hs-layout'>)</span> <span class='hs-varid'>exts</span>
<a name="line-33"></a> <span class='hs-varid'>isEnabled</span> <span class='hs-layout'>(</span><span class='hs-conid'>All</span> <span class='hs-varid'>exts</span><span class='hs-layout'>)</span> <span class='hs-varid'>enabled</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>all</span> <span class='hs-layout'>(</span><span class='hs-varop'>`elem`</span> <span class='hs-varid'>enabled</span><span class='hs-layout'>)</span> <span class='hs-varid'>exts</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Enabled</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Enabled</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-36"></a> <span class='hs-varid'>isEnabled</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>const</span> <span class='hs-conid'>True</span>
<a name="line-37"></a> <span class='hs-varid'>isEnabled</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isEnabled</span> <span class='hs-varid'>a</span>
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