122 lines
21 KiB
HTML
122 lines
21 KiB
HTML
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<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
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<title>src/Servant/Utils/Links.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE PolyKinds #-}</span>
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<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE DataKinds #-}</span>
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<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
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<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
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<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE TypeOperators #-}</span>
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<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE FunctionalDependencies #-}</span>
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<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE ScopedTypeVariables #-}</span>
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<a name="line-8"></a><span class='hs-comment'>{-# LANGUAGE UndecidableInstances #-}</span>
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<a name="line-9"></a><span class='hs-comment'>-- | Type safe internal links.</span>
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<a name="line-10"></a><span class='hs-comment'>--</span>
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<a name="line-11"></a><span class='hs-comment'>-- Provides the function 'mkLink':</span>
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<a name="line-12"></a><span class='hs-comment'>--</span>
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<a name="line-13"></a><span class='hs-comment'>-- @</span>
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<a name="line-14"></a><span class='hs-comment'>-- type API = Proxy ("hello" :> Get Int</span>
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<a name="line-15"></a><span class='hs-comment'>-- :<|> "bye" :> QueryParam "name" String :> Post Bool)</span>
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<a name="line-16"></a><span class='hs-comment'>--</span>
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<a name="line-17"></a><span class='hs-comment'>-- api :: API</span>
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<a name="line-18"></a><span class='hs-comment'>-- api = proxy</span>
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<a name="line-19"></a><span class='hs-comment'>--</span>
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<a name="line-20"></a><span class='hs-comment'>-- link1 :: Proxy ("hello" :> Get Int)</span>
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<a name="line-21"></a><span class='hs-comment'>-- link1 = proxy</span>
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<a name="line-22"></a><span class='hs-comment'>--</span>
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<a name="line-23"></a><span class='hs-comment'>-- link2 :: Proxy ("hello" :> Delete)</span>
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<a name="line-24"></a><span class='hs-comment'>-- link2 = proxy</span>
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<a name="line-25"></a><span class='hs-comment'>--</span>
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<a name="line-26"></a><span class='hs-comment'>-- mkLink link1 API -- typechecks, returns 'Link "/hello"'</span>
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<a name="line-27"></a><span class='hs-comment'>--</span>
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<a name="line-28"></a><span class='hs-comment'>-- mkLink link2 API -- doesn't typecheck</span>
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<a name="line-29"></a><span class='hs-comment'>-- @</span>
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<a name="line-30"></a><span class='hs-comment'>--</span>
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<a name="line-31"></a><span class='hs-comment'>-- That is, 'mkLink' takes two arguments, a link proxy and a sitemap, and</span>
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<a name="line-32"></a><span class='hs-comment'>-- returns a 'Link', but only typechecks if the link proxy is a valid link,</span>
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<a name="line-33"></a><span class='hs-comment'>-- and part of the sitemap.</span>
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<a name="line-34"></a><span class='hs-comment'>--</span>
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<a name="line-35"></a><span class='hs-comment'>-- __N.B.:__ 'mkLink' assumes a capture matches any string (without slashes).</span>
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<a name="line-36"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span><span class='hs-varop'>.</span><span class='hs-conid'>Links</span> <span class='hs-keyword'>where</span>
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<a name="line-37"></a>
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<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Proxy</span>
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<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeLits</span>
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<a name="line-40"></a>
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<a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Capture</span>
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<a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>ReqBody</span>
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<a name="line-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>QueryParam</span>
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<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Get</span>
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<a name="line-45"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Post</span>
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<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Put</span>
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<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Delete</span>
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<a name="line-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Sub</span>
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<a name="line-49"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Alternative</span>
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<a name="line-50"></a>
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<a name="line-51"></a>
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<a name="line-52"></a><span class='hs-keyword'>type</span> <span class='hs-varid'>family</span> <span class='hs-conid'>Or</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>where</span>
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<a name="line-53"></a> <span class='hs-conid'>Or</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span>
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<a name="line-54"></a> <span class='hs-conid'>Or</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span>
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<a name="line-55"></a> <span class='hs-conid'>Or</span> <span class='hs-varid'>a</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span>
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<a name="line-56"></a>
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<a name="line-57"></a><span class='hs-keyword'>type</span> <span class='hs-varid'>family</span> <span class='hs-conid'>And</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>where</span>
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<a name="line-58"></a> <span class='hs-conid'>And</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span>
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<a name="line-59"></a> <span class='hs-conid'>And</span> <span class='hs-varid'>a</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span>
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<a name="line-60"></a> <span class='hs-conid'>And</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span>
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<a name="line-61"></a>
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<a name="line-62"></a><span class='hs-keyword'>type</span> <span class='hs-varid'>family</span> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>a</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>where</span>
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<a name="line-63"></a> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-varid'>sa</span> <span class='hs-conop'>:<|></span> <span class='hs-varid'>sb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Or</span> <span class='hs-layout'>(</span><span class='hs-conid'>IsElem</span> <span class='hs-varid'>e</span> <span class='hs-varid'>sa</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>IsElem</span> <span class='hs-varid'>e</span> <span class='hs-varid'>sb</span><span class='hs-layout'>)</span>
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<a name="line-64"></a> <span class='hs-conid'>IsElem</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-conop'>:></span> <span class='hs-varid'>sa</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-conop'>:></span> <span class='hs-varid'>sb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>sa</span> <span class='hs-varid'>sb</span>
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<a name="line-65"></a> <span class='hs-conid'>IsElem</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-conop'>:></span> <span class='hs-varid'>sa</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-conop'>:></span> <span class='hs-varid'>sb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>sa</span> <span class='hs-varid'>sb</span>
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<a name="line-66"></a> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>sa</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReqBody</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:></span> <span class='hs-varid'>sb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>sa</span> <span class='hs-varid'>sb</span>
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<a name="line-67"></a> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>sa</span> <span class='hs-layout'>(</span><span class='hs-conid'>QueryParam</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-conop'>:></span> <span class='hs-varid'>sb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>sa</span> <span class='hs-varid'>sb</span>
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<a name="line-68"></a> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>e</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span>
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<a name="line-69"></a> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>e</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span>
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<a name="line-70"></a>
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<a name="line-71"></a><span class='hs-keyword'>type</span> <span class='hs-varid'>family</span> <span class='hs-conid'>IsLink''</span> <span class='hs-varid'>l</span> <span class='hs-keyword'>where</span>
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<a name="line-72"></a> <span class='hs-conid'>IsLink''</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-conop'>:></span> <span class='hs-conid'>Get</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsLink'</span> <span class='hs-varid'>e</span>
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<a name="line-73"></a> <span class='hs-conid'>IsLink''</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-conop'>:></span> <span class='hs-conid'>Post</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsLink'</span> <span class='hs-varid'>e</span>
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<a name="line-74"></a> <span class='hs-conid'>IsLink''</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-conop'>:></span> <span class='hs-conid'>Put</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsLink'</span> <span class='hs-varid'>e</span>
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<a name="line-75"></a> <span class='hs-conid'>IsLink''</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-conop'>:></span> <span class='hs-conid'>Delete</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsLink'</span> <span class='hs-varid'>e</span>
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<a name="line-76"></a> <span class='hs-conid'>IsLink''</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>False</span>
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<a name="line-77"></a>
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<a name="line-78"></a><span class='hs-keyword'>type</span> <span class='hs-varid'>family</span> <span class='hs-conid'>IsLink'</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>where</span>
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<a name="line-79"></a> <span class='hs-conid'>IsLink'</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Symbol</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span>
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<a name="line-80"></a>
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<a name="line-81"></a><span class='hs-keyword'>type</span> <span class='hs-varid'>family</span> <span class='hs-conid'>IsLink</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>where</span>
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<a name="line-82"></a> <span class='hs-conid'>IsLink</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-conop'>:></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Or</span> <span class='hs-layout'>(</span><span class='hs-conid'>And</span> <span class='hs-layout'>(</span><span class='hs-conid'>IsLink'</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>IsLink''</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
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<a name="line-83"></a> <span class='hs-layout'>(</span><span class='hs-conid'>IsLink''</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-conop'>:></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
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<a name="line-84"></a>
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<a name="line-85"></a>
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<a name="line-86"></a><a name="ValidLinkIn"></a><span class='hs-comment'>-- | The 'ValidLinkIn f s' constraint holds when 's' is an API that</span>
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<a name="line-87"></a><a name="ValidLinkIn"></a><span class='hs-comment'>-- contains 'f', and 'f' is a link.</span>
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<a name="line-88"></a><a name="ValidLinkIn"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>ValidLinkIn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>where</span>
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<a name="line-89"></a> <span class='hs-varid'>mkLink</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Link</span> <span class='hs-comment'>-- ^ This function will only typecheck if `f`</span>
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<a name="line-90"></a> <span class='hs-comment'>-- is an URI within `s`</span>
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<a name="line-91"></a>
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<a name="line-92"></a><a name="instance%20ValidLinkIn%20f%20s"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span> <span class='hs-conid'>IsElem</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>~</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span>
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<a name="line-93"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>IsLink</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>~</span> <span class='hs-chr'>'</span><span class='hs-conid'>True</span>
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<a name="line-94"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>VLinkHelper</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ValidLinkIn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>where</span>
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<a name="line-95"></a> <span class='hs-varid'>mkLink</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Link</span> <span class='hs-layout'>(</span><span class='hs-varid'>vlh</span> <span class='hs-layout'>(</span><span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
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<a name="line-96"></a>
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<a name="line-97"></a><a name="Link"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Link</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Link</span> <span class='hs-conid'>String</span> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Show</span>
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<a name="line-98"></a>
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<a name="line-99"></a><a name="VLinkHelper"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>VLinkHelper</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>where</span>
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<a name="line-100"></a> <span class='hs-varid'>vlh</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>proxy</span><span class='hs-varop'>.</span> <span class='hs-varid'>proxy</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
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<a name="line-101"></a>
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<a name="line-102"></a><a name="instance%20VLinkHelper%20(s%20:%3e%20e)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>KnownSymbol</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>VLinkHelper</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>VLinkHelper</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-conop'>:></span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
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<a name="line-103"></a> <span class='hs-varid'>vlh</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>symbolVal</span> <span class='hs-layout'>(</span><span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-varid'>vlh</span> <span class='hs-layout'>(</span><span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
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<a name="line-104"></a>
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<a name="line-105"></a><a name="instance%20VLinkHelper%20(Get%20x)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>VLinkHelper</span> <span class='hs-layout'>(</span><span class='hs-conid'>Get</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
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<a name="line-106"></a> <span class='hs-varid'>vlh</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
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<a name="line-107"></a>
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<a name="line-108"></a><a name="instance%20VLinkHelper%20(Post%20x)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>VLinkHelper</span> <span class='hs-layout'>(</span><span class='hs-conid'>Post</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
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<a name="line-109"></a> <span class='hs-varid'>vlh</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
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<a name="line-110"></a>
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</pre></body>
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