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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2007 David Roundy</span>
<a name="line-2"></a><span class='hs-comment'>--</span>
<a name="line-3"></a><span class='hs-comment'>-- This program is free software; you can redistribute it and/or modify</span>
<a name="line-4"></a><span class='hs-comment'>-- it under the terms of the GNU General Public License as published by</span>
<a name="line-5"></a><span class='hs-comment'>-- the Free Software Foundation; either version 2, or (at your option)</span>
<a name="line-6"></a><span class='hs-comment'>-- any later version.</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- This program is distributed in the hope that it will be useful,</span>
<a name="line-9"></a><span class='hs-comment'>-- but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="line-10"></a><span class='hs-comment'>-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="line-11"></a><span class='hs-comment'>-- GNU General Public License for more details.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- You should have received a copy of the GNU General Public License</span>
<a name="line-14"></a><span class='hs-comment'>-- along with this program; see the file COPYING. If not, write to</span>
<a name="line-15"></a><span class='hs-comment'>-- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="line-16"></a><span class='hs-comment'>-- Boston, MA 02110-1301, USA.</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-orphans -fno-warn-name-shadowing #-}</span>
<a name="line-19"></a><span class='hs-comment'>{-# LANGUAGE CPP, FlexibleContexts, UndecidableInstances #-}</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-cpp'>#include "gadts.h"</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>V2</span><span class='hs-varop'>.</span><span class='hs-conid'>Non</span>
<a name="line-24"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Non</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Nonable</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unNon</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>showNon</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>showNons</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>readNon</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>readNons</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>commutePrimsOrAddToCtx</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>commuteOrAddToCtx</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>commuteOrRemFromCtx</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>commuteOrAddToCtxRL</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>commuteOrRemFromCtxFL</span>
<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>remNons</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>*></span><span class='hs-layout'>)</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>*</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>*>></span><span class='hs-layout'>)</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>>*</span><span class='hs-layout'>)</span>
<a name="line-41"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-42"></a>
<a name="line-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span> <span class='hs-varid'>rem</span> <span class='hs-layout'>)</span>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span> <span class='hs-varid'>delete</span> <span class='hs-layout'>)</span>
<a name="line-45"></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-layout'>(</span> <span class='hs-varid'>liftM</span><span class='hs-layout'>,</span> <span class='hs-varid'>mzero</span> <span class='hs-layout'>)</span>
<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Commute</span> <span class='hs-layout'>(</span> <span class='hs-varid'>commuteFL</span> <span class='hs-layout'>)</span>
<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Effect</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Effect</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Format</span> <span class='hs-layout'>(</span> <span class='hs-conid'>PatchListFormat</span><span class='hs-layout'>,</span> <span class='hs-conid'>FileNameFormat</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-49"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Invert</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Invert</span><span class='hs-layout'>,</span> <span class='hs-varid'>invertFL</span><span class='hs-layout'>,</span> <span class='hs-varid'>invertRL</span> <span class='hs-layout'>)</span>
<a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Prim</span> <span class='hs-layout'>(</span> <span class='hs-conid'>FromPrim</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-51"></a> <span class='hs-conid'>PrimOf</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatchBase</span><span class='hs-layout'>,</span>
<a name="line-52"></a> <span class='hs-varid'>showPrim</span><span class='hs-layout'>,</span> <span class='hs-varid'>sortCoalesceFL</span><span class='hs-layout'>,</span>
<a name="line-53"></a> <span class='hs-varid'>readPrim</span> <span class='hs-layout'>)</span>
<a name="line-54"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Patchy</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Patchy</span><span class='hs-layout'>,</span> <span class='hs-varid'>showPatch</span><span class='hs-layout'>,</span> <span class='hs-conid'>ReadPatch</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-55"></a> <span class='hs-conid'>Commute</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>invert</span> <span class='hs-layout'>)</span>
<a name="line-56"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>ReadMonads</span> <span class='hs-layout'>(</span> <span class='hs-conid'>ParserM</span><span class='hs-layout'>,</span> <span class='hs-varid'>lexChar</span> <span class='hs-layout'>)</span>
<a name="line-57"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Witnesses</span><span class='hs-varop'>.</span><span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span> <span class='hs-conid'>MyEq</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>EqCheck</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-58"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Witnesses</span><span class='hs-varop'>.</span><span class='hs-conid'>Ordered</span> <span class='hs-layout'>(</span> <span class='hs-conid'>FL</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>RL</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>+>+</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>mapRL_RL</span>
<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conop'>:></span><span class='hs-layout'>)</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>reverseFL</span><span class='hs-layout'>,</span> <span class='hs-varid'>reverseRL</span> <span class='hs-layout'>)</span>
<a name="line-60"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Read</span> <span class='hs-layout'>(</span> <span class='hs-varid'>peekfor</span> <span class='hs-layout'>)</span>
<a name="line-61"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Show</span> <span class='hs-layout'>(</span> <span class='hs-conid'>ShowPatchBasic</span> <span class='hs-layout'>)</span>
<a name="line-62"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Viewing</span> <span class='hs-conid'>()</span>
<a name="line-63"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Permutations</span> <span class='hs-layout'>(</span> <span class='hs-varid'>removeFL</span><span class='hs-layout'>,</span> <span class='hs-varid'>commuteWhatWeCanFL</span> <span class='hs-layout'>)</span>
<a name="line-64"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Witnesses</span><span class='hs-varop'>.</span><span class='hs-conid'>Show</span> <span class='hs-layout'>(</span> <span class='hs-conid'>ShowDict</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show1</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show2</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>appPrec</span>
<a name="line-65"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>showsPrec2</span> <span class='hs-layout'>)</span>
<a name="line-66"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Witnesses</span><span class='hs-varop'>.</span><span class='hs-conid'>Sealed</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Sealed</span><span class='hs-layout'>(</span><span class='hs-conid'>Sealed</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-67"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Printer</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Doc</span><span class='hs-layout'>,</span> <span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-varid'>vcat</span><span class='hs-layout'>,</span> <span class='hs-varid'>hiddenPrefix</span><span class='hs-layout'>,</span> <span class='hs-varid'>blueText</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$$</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-68"></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'>BC</span> <span class='hs-layout'>(</span> <span class='hs-varid'>pack</span><span class='hs-layout'>,</span> <span class='hs-varid'>singleton</span> <span class='hs-layout'>)</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="Non"></a><span class='hs-comment'>-- |A 'Non' stores a context with a 'Prim' patch. It is a patch whose effect</span>
<a name="line-71"></a><a name="Non"></a><span class='hs-comment'>-- isn't visible - a Non-affecting patch.</span>
<a name="line-72"></a><a name="Non"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-73"></a> <span class='hs-conid'>Non</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="unNon"></a><span class='hs-comment'>-- |unNon converts a Non into a FL of its context followed by the primitive</span>
<a name="line-76"></a><span class='hs-comment'>-- patch.</span>
<a name="line-77"></a><span class='hs-definition'>unNon</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FromPrim</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Sealed</span> <span class='hs-layout'>(</span><span class='hs-conid'>FL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-78"></a><span class='hs-definition'>unNon</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>c</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Sealed</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>+>+</span> <span class='hs-varid'>fromPrim</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:>:</span> <span class='hs-conid'>NilFL</span><span class='hs-layout'>)</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="instance%20Show%20(Non%20p%20C(x))"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show2</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show2</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Show</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-81"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>d</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showParen</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>></span> <span class='hs-varid'>appPrec</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>showString</span> <span class='hs-str'>"Non "</span> <span class='hs-varop'>.</span>
<a name="line-82"></a> <span class='hs-varid'>showsPrec2</span> <span class='hs-layout'>(</span><span class='hs-varid'>appPrec</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span> <span class='hs-varop'>.</span> <span class='hs-varid'>showString</span> <span class='hs-str'>" "</span> <span class='hs-varop'>.</span>
<a name="line-83"></a> <span class='hs-varid'>showsPrec2</span> <span class='hs-layout'>(</span><span class='hs-varid'>appPrec</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>p</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="instance%20Show1%20(Non%20p)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show2</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show2</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Show1</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-86"></a> <span class='hs-varid'>showDict1</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ShowDictClass</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="showNons"></a><span class='hs-comment'>-- |showNons creates a Doc representing a list of Nons.</span>
<a name="line-89"></a><span class='hs-definition'>showNons</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ShowPatchBasic</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PatchListFormat</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatchBase</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-90"></a> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Doc</span>
<a name="line-91"></a><span class='hs-definition'>showNons</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-92"></a><span class='hs-definition'>showNons</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>blueText</span> <span class='hs-str'>"{{"</span> <span class='hs-varop'>$$</span> <span class='hs-varid'>vcat</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>showNon</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varop'>$$</span> <span class='hs-varid'>blueText</span> <span class='hs-str'>"}}"</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="showNon"></a><span class='hs-comment'>-- |showNon creates a Doc representing a Non.</span>
<a name="line-95"></a><span class='hs-definition'>showNon</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ShowPatchBasic</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PatchListFormat</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatchBase</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-96"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Doc</span>
<a name="line-97"></a><span class='hs-definition'>showNon</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>c</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hiddenPrefix</span> <span class='hs-str'>"|"</span> <span class='hs-layout'>(</span><span class='hs-varid'>showPatch</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-98"></a> <span class='hs-varop'>$$</span> <span class='hs-varid'>hiddenPrefix</span> <span class='hs-str'>"|"</span> <span class='hs-layout'>(</span><span class='hs-varid'>blueText</span> <span class='hs-str'>":"</span><span class='hs-layout'>)</span>
<a name="line-99"></a> <span class='hs-varop'>$$</span> <span class='hs-varid'>showPrim</span> <span class='hs-conid'>NewFormat</span> <span class='hs-varid'>p</span>
<a name="line-100"></a>
<a name="line-101"></a><a name="readNons"></a><span class='hs-comment'>-- |readNons is a parser that attempts to read a list of Nons.</span>
<a name="line-102"></a><span class='hs-definition'>readNons</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReadPatch</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PatchListFormat</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatchBase</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ParserM</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-104"></a><span class='hs-definition'>readNons</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>peekfor</span> <span class='hs-layout'>(</span><span class='hs-conid'>BC</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"{{"</span><span class='hs-layout'>)</span> <span class='hs-varid'>rns</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-105"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>rns</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>peekfor</span> <span class='hs-layout'>(</span><span class='hs-conid'>BC</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"}}"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-106"></a> <span class='hs-keyword'>do</span> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readPatch'</span>
<a name="line-107"></a> <span class='hs-varid'>lexChar</span> <span class='hs-chr'>':'</span>
<a name="line-108"></a> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readPrim</span> <span class='hs-conid'>NewFormat</span>
<a name="line-109"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>p</span> <span class='hs-conop'>:</span><span class='hs-layout'>)</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>rns</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="readNon"></a><span class='hs-comment'>-- |readNon is a parser that attempts to read a single Non.</span>
<a name="line-112"></a><span class='hs-definition'>readNon</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReadPatch</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PatchListFormat</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatchBase</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ParserM</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-113"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-114"></a><span class='hs-definition'>readNon</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readPatch'</span>
<a name="line-115"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>doReadPrim</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readPrim</span> <span class='hs-conid'>NewFormat</span>
<a name="line-116"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Non</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>p</span>
<a name="line-117"></a> <span class='hs-varid'>peekfor</span> <span class='hs-layout'>(</span><span class='hs-conid'>BC</span><span class='hs-varop'>.</span><span class='hs-varid'>singleton</span> <span class='hs-chr'>':'</span><span class='hs-layout'>)</span> <span class='hs-varid'>doReadPrim</span> <span class='hs-varid'>mzero</span>
<a name="line-118"></a>
<a name="line-119"></a><a name="instance%20Eq%20(Non%20p%20C(x))"></a><span class='hs-comment'>-- |Nons are equal if their context patches are equal, and they have an equal</span>
<a name="line-120"></a><a name="instance%20Eq%20(Non%20p%20C(x))"></a><span class='hs-comment'>-- prim patch.</span>
<a name="line-121"></a><a name="instance%20Eq%20(Non%20p%20C(x))"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Commute</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>MyEq</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>MyEq</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-122"></a> <span class='hs-conid'>Non</span> <span class='hs-layout'>(</span><span class='hs-varid'>cx</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y1</span> <span class='hs-varid'>z1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-123"></a> <span class='hs-varop'>==</span> <span class='hs-conid'>Non</span> <span class='hs-layout'>(</span><span class='hs-varid'>cy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y2</span> <span class='hs-varid'>z2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-124"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>cx</span> <span class='hs-varop'>=\/=</span> <span class='hs-varid'>cy</span> <span class='hs-keyword'>of</span>
<a name="line-125"></a> <span class='hs-conid'>IsEq</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-varop'>=\/=</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EqCheck</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>z1</span> <span class='hs-varid'>z2</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-126"></a> <span class='hs-conid'>IsEq</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-127"></a> <span class='hs-conid'>NotEq</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-128"></a> <span class='hs-conid'>NotEq</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-129"></a>
<a name="line-130"></a><span class='hs-comment'>-- |Nonable represents the class of patches that can be turned into a Non.</span>
<a name="line-131"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Nonable</span> <span class='hs-varid'>p</span> <span class='hs-keyword'>where</span>
<a name="line-132"></a> <span class='hs-varid'>non</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-133"></a>
<a name="line-134"></a><a name="commuteOrAddToCtx"></a><span class='hs-comment'>-- |'commuteOrAddToCtx' @x cy@ tries to commute @x@ past @cy@ and always</span>
<a name="line-135"></a><span class='hs-comment'>-- returns some variant @cy'@. If commutation suceeds, the variant is just</span>
<a name="line-136"></a><span class='hs-comment'>-- straightforwardly the commuted version. If commutation fails, the variant</span>
<a name="line-137"></a><span class='hs-comment'>-- consists of @x@ prepended to the context of @cy@.</span>
<a name="line-138"></a><span class='hs-definition'>commuteOrAddToCtx</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-139"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-140"></a><span class='hs-definition'>commuteOrAddToCtx</span> <span class='hs-varid'>p</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>n'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>p</span> <span class='hs-varop'>>*</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n'</span>
<a name="line-141"></a><span class='hs-definition'>commuteOrAddToCtx</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>c</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Non</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-conop'>:>:</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span>
<a name="line-142"></a>
<a name="line-143"></a><a name="commuteOrAddToCtxRL"></a><span class='hs-comment'>-- | 'commuteOrAddToCtxRL' @xs cy@ commutes as many patches of @xs@ past @cy@</span>
<a name="line-144"></a><span class='hs-comment'>-- as possible, adding any that don't commute to the context of cy. Suppose we</span>
<a name="line-145"></a><span class='hs-comment'>-- have</span>
<a name="line-146"></a><span class='hs-comment'>--</span>
<a name="line-147"></a><span class='hs-comment'>-- > x1 x2 x3 [c1 c2 y]</span>
<a name="line-148"></a><span class='hs-comment'>--</span>
<a name="line-149"></a><span class='hs-comment'>-- and that in our example @x1@ fails to commute past @c1@, this function</span>
<a name="line-150"></a><span class='hs-comment'>-- would commute down to</span>
<a name="line-151"></a><span class='hs-comment'>--</span>
<a name="line-152"></a><span class='hs-comment'>-- > x1 [c1'' c2'' y''] x2' x3'</span>
<a name="line-153"></a><span class='hs-comment'>--</span>
<a name="line-154"></a><span class='hs-comment'>-- and return @[x1 c1'' c2'' y'']@</span>
<a name="line-155"></a><span class='hs-definition'>commuteOrAddToCtxRL</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>RL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-156"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-157"></a><span class='hs-definition'>commuteOrAddToCtxRL</span> <span class='hs-conid'>NilRL</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span>
<a name="line-158"></a><span class='hs-definition'>commuteOrAddToCtxRL</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-conop'>:<:</span><span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>commuteOrAddToCtxRL</span> <span class='hs-varid'>ps</span> <span class='hs-varop'>$</span> <span class='hs-varid'>commuteOrAddToCtx</span> <span class='hs-varid'>p</span> <span class='hs-varid'>n</span>
<a name="line-159"></a>
<a name="line-160"></a><span class='hs-comment'>-- |abstract over 'FL'/'RL'</span>
<a name="line-161"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>WL</span> <span class='hs-varid'>l</span> <span class='hs-keyword'>where</span>
<a name="line-162"></a> <span class='hs-varid'>toFL</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>l</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-163"></a> <span class='hs-varid'>toRL</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>l</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-164"></a> <span class='hs-varid'>invertWL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Invert</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>l</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-165"></a>
<a name="line-166"></a><a name="instance%20WL%20FL"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>WL</span> <span class='hs-conid'>FL</span> <span class='hs-keyword'>where</span>
<a name="line-167"></a> <span class='hs-varid'>toFL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>id</span>
<a name="line-168"></a> <span class='hs-varid'>toRL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverseFL</span>
<a name="line-169"></a> <span class='hs-varid'>invertWL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverseRL</span> <span class='hs-varop'>.</span> <span class='hs-varid'>invertFL</span>
<a name="line-170"></a>
<a name="line-171"></a><a name="instance%20WL%20RL"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>WL</span> <span class='hs-conid'>RL</span> <span class='hs-keyword'>where</span>
<a name="line-172"></a> <span class='hs-varid'>toFL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverseRL</span>
<a name="line-173"></a> <span class='hs-varid'>toRL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>id</span>
<a name="line-174"></a> <span class='hs-varid'>invertWL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverseFL</span> <span class='hs-varop'>.</span> <span class='hs-varid'>invertRL</span>
<a name="line-175"></a>
<a name="line-176"></a><a name="commutePrimsOrAddToCtx"></a><span class='hs-comment'>-- |commutePrimsOrAddToCtx takes a WL of prims and attempts to commute them</span>
<a name="line-177"></a><span class='hs-comment'>-- past a Non.</span>
<a name="line-178"></a><span class='hs-definition'>commutePrimsOrAddToCtx</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>WL</span> <span class='hs-varid'>l</span><span class='hs-layout'>,</span> <span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-179"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-180"></a><span class='hs-definition'>commutePrimsOrAddToCtx</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>commuteOrAddToCtxRL</span> <span class='hs-layout'>(</span><span class='hs-varid'>mapRL_RL</span> <span class='hs-varid'>fromPrim</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toRL</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span>
<a name="line-181"></a>
<a name="line-182"></a><span class='hs-comment'>-- TODO: Figure out what remNons is for; it's is only used in one place - when</span>
<a name="line-183"></a><span class='hs-comment'>-- commuting two Conflictors:</span>
<a name="line-184"></a><span class='hs-comment'>--</span>
<a name="line-185"></a><span class='hs-comment'>-- > commute (Conflictor a1 n1 p1 :> Conflictor a2 n2 p2)</span>
<a name="line-186"></a><span class='hs-comment'>-- > ...</span>
<a name="line-187"></a><span class='hs-comment'>-- > a1' = map (commutePrimsOrAddToCtx n2) a1</span>
<a name="line-188"></a><span class='hs-comment'>-- > p2ooo = remNons a1' p2</span>
<a name="line-189"></a><span class='hs-comment'>-- > n2n1 = n2 +>+ n1</span>
<a name="line-190"></a><span class='hs-comment'>-- > n1' :> n2' <- return $ filterConflictsFL p2ooo n2n1</span>
<a name="line-191"></a><span class='hs-comment'>--</span>
<a name="line-192"></a><span class='hs-comment'>-- which appears to be munging the not-yet-undone FLs in the Conflictors. a1'</span>
<a name="line-193"></a><span class='hs-comment'>-- will be the list of Nons with n2 commuted in/past them. So we then want to</span>
<a name="line-194"></a><span class='hs-comment'>-- modify p2, so that it doesn't have any of a1' in its context.</span>
<a name="line-195"></a>
<a name="line-196"></a><a name="remNons"></a><span class='hs-comment'>-- remNons really only works right if the relevant nons are conflicting...</span>
<a name="line-197"></a><span class='hs-definition'>remNons</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nonable</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Effect</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatchBase</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span>
<a name="line-198"></a> <span class='hs-conid'>MyEq</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-199"></a><span class='hs-definition'>remNons</span> <span class='hs-varid'>ns</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>c</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>remNonHelper</span> <span class='hs-varid'>ns</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>of</span>
<a name="line-200"></a> <span class='hs-conid'>NilFL</span> <span class='hs-conop'>:></span> <span class='hs-varid'>c'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>c'</span> <span class='hs-varid'>x</span>
<a name="line-201"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span>
<a name="line-202"></a> <span class='hs-keyword'>where</span>
<a name="line-203"></a> <span class='hs-varid'>remNonHelper</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nonable</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Effect</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span>
<a name="line-204"></a> <span class='hs-conid'>PrimPatchBase</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>MyEq</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-205"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>FL</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conop'>:></span> <span class='hs-conid'>FL</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-206"></a> <span class='hs-varid'>remNonHelper</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NilFL</span> <span class='hs-conop'>:></span> <span class='hs-varid'>x</span>
<a name="line-207"></a> <span class='hs-varid'>remNonHelper</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>NilFL</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NilFL</span> <span class='hs-conop'>:></span> <span class='hs-conid'>NilFL</span>
<a name="line-208"></a> <span class='hs-varid'>remNonHelper</span> <span class='hs-varid'>ns</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-209"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>non</span> <span class='hs-varid'>c</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>ns</span> <span class='hs-keyglyph'>=</span>
<a name="line-210"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>nsWithoutC</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delete</span> <span class='hs-layout'>(</span><span class='hs-varid'>non</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>ns</span> <span class='hs-keyword'>in</span>
<a name="line-211"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>commuteOrAddInvC</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>commuteOrAddToCtx</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invert</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>in</span>
<a name="line-212"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>remNonHelper</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>commuteOrAddInvC</span> <span class='hs-varop'>$</span> <span class='hs-varid'>nsWithoutC</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span> <span class='hs-keyword'>of</span>
<a name="line-213"></a> <span class='hs-varid'>a</span> <span class='hs-conop'>:></span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>sortCoalesceFL</span> <span class='hs-layout'>(</span><span class='hs-varid'>effect</span> <span class='hs-varid'>c</span> <span class='hs-varop'>+>+</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-conop'>:></span> <span class='hs-varid'>z</span>
<a name="line-214"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>commuteWhatWeCanFL</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-conop'>:></span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-215"></a> <span class='hs-varid'>b</span> <span class='hs-conop'>:></span> <span class='hs-varid'>c'</span> <span class='hs-conop'>:></span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>remNonHelper</span> <span class='hs-varid'>ns</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>of</span>
<a name="line-216"></a> <span class='hs-varid'>a</span> <span class='hs-conop'>:></span> <span class='hs-varid'>b'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-conop'>:></span> <span class='hs-layout'>(</span><span class='hs-varid'>b'</span> <span class='hs-varop'>+>+</span> <span class='hs-varid'>c'</span> <span class='hs-conop'>:>:</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-217"></a>
<a name="line-218"></a><a name="commuteOrRemFromCtx"></a><span class='hs-comment'>-- |commuteOrRemFromCtx attempts to remove a given patch from a Non. If the</span>
<a name="line-219"></a><span class='hs-comment'>-- patch was not in the Non, then the commute will succeed and the modified Non</span>
<a name="line-220"></a><span class='hs-comment'>-- will be returned. If the commute fails then the patch is either in the Non</span>
<a name="line-221"></a><span class='hs-comment'>-- context, or the Non patch itself; we attempt to remove the patch from the</span>
<a name="line-222"></a><span class='hs-comment'>-- context and then return the non with the updated context.</span>
<a name="line-223"></a><span class='hs-comment'>--</span>
<a name="line-224"></a><span class='hs-comment'>-- TODO: understand if there is any case where p is equal to the prim patch of</span>
<a name="line-225"></a><span class='hs-comment'>-- the Non, in which case, we return the original Non, is that right?</span>
<a name="line-226"></a><span class='hs-definition'>commuteOrRemFromCtx</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-227"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-228"></a><span class='hs-definition'>commuteOrRemFromCtx</span> <span class='hs-varid'>p</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n'</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-keyword'>_</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-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n'</span>
<a name="line-229"></a><span class='hs-definition'>commuteOrRemFromCtx</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>pc</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>removeFL</span> <span class='hs-varid'>p</span> <span class='hs-varid'>pc</span> <span class='hs-varop'>>>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>c</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-230"></a>
<a name="line-231"></a><a name="commuteOrRemFromCtxFL"></a><span class='hs-comment'>-- |commuteOrRemFromCtxFL attempts to remove a FL of patches from a Non,</span>
<a name="line-232"></a><span class='hs-comment'>-- returning Nothing if any of the individual removes fail.</span>
<a name="line-233"></a><span class='hs-definition'>commuteOrRemFromCtxFL</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>FL</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-234"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-235"></a><span class='hs-definition'>commuteOrRemFromCtxFL</span> <span class='hs-conid'>NilFL</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>n</span>
<a name="line-236"></a><span class='hs-definition'>commuteOrRemFromCtxFL</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-conop'>:>:</span><span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>n'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>commuteOrRemFromCtx</span> <span class='hs-varid'>p</span> <span class='hs-varid'>n</span>
<a name="line-237"></a> <span class='hs-varid'>commuteOrRemFromCtxFL</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>n'</span>
<a name="line-238"></a>
<a name="line-239"></a><a name="*%3e"></a><span class='hs-comment'>-- |(*>) attemts to modify a Non by commuting it past a given patch.</span>
<a name="line-240"></a><span class='hs-layout'>(</span><span class='hs-varop'>*></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-241"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-242"></a><a name="n"></a><span class='hs-definition'>n</span> <span class='hs-varop'>*></span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>invert</span> <span class='hs-varid'>p</span> <span class='hs-varop'>>*</span> <span class='hs-varid'>n</span>
<a name="line-243"></a>
<a name="line-244"></a><a name="%3e*"></a><span class='hs-comment'>-- |(>*) attempts to modify a Non, by commuting a given patch past it.</span>
<a name="line-245"></a><span class='hs-layout'>(</span><span class='hs-varop'>>*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-246"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-247"></a><a name="y"></a><span class='hs-definition'>y</span> <span class='hs-varop'>>*</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>c</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-248"></a> <span class='hs-varid'>c'</span> <span class='hs-conop'>:></span> <span class='hs-varid'>y'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>commuteFL</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span> <span class='hs-conop'>:></span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-249"></a> <span class='hs-varid'>px'</span> <span class='hs-conop'>:></span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>commute</span> <span class='hs-layout'>(</span><span class='hs-varid'>y'</span> <span class='hs-conop'>:></span> <span class='hs-varid'>fromPrim</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-250"></a> <span class='hs-varid'>x'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>toPrim</span> <span class='hs-varid'>px'</span>
<a name="line-251"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>c'</span> <span class='hs-varid'>x'</span><span class='hs-layout'>)</span>
<a name="line-252"></a>
<a name="line-253"></a><a name="*%3e%3e"></a><span class='hs-comment'>-- |(*>>) attempts to modify a Non by commuting it past a given WL of patches.</span>
<a name="line-254"></a><span class='hs-layout'>(</span><span class='hs-varop'>*>></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>WL</span> <span class='hs-varid'>l</span><span class='hs-layout'>,</span> <span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatchBase</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-255"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-256"></a><span class='hs-definition'>n</span> <span class='hs-varop'>*>></span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>invertWL</span> <span class='hs-varid'>p</span> <span class='hs-varop'>>>*</span> <span class='hs-varid'>n</span>
<a name="line-257"></a>
<a name="line-258"></a><a name="%3e%3e*"></a><span class='hs-comment'>-- |(>>*) attempts to modify a Non by commuting a given WL of patches past it.</span>
<a name="line-259"></a><span class='hs-layout'>(</span><span class='hs-varop'>>>*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>WL</span> <span class='hs-varid'>l</span><span class='hs-layout'>,</span> <span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-260"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-261"></a><a name="ps"></a><span class='hs-definition'>ps</span> <span class='hs-varop'>>>*</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>commuteRLPastNon</span> <span class='hs-layout'>(</span><span class='hs-varid'>toRL</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span>
<a name="line-262"></a> <span class='hs-keyword'>where</span>
<a name="line-263"></a> <span class='hs-varid'>commuteRLPastNon</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Patchy</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToFromPrim</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>RL</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-264"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Non</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-265"></a> <span class='hs-varid'>commuteRLPastNon</span> <span class='hs-conid'>NilRL</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>n</span>
<a name="line-266"></a> <span class='hs-varid'>commuteRLPastNon</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:<:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromPrim</span> <span class='hs-varid'>x</span> <span class='hs-varop'>>*</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>commuteRLPastNon</span> <span class='hs-varid'>xs</span>
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