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<title>src/Control/Lens/Internal/List.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Control.Lens.Internal.List</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (C) 2014-2016 Edward Kmett and Eric Mertens</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- This module provides utility functions on lists used by the library</span>
<a name="line-12"></a><span class='hs-comment'>-- implementation.</span>
<a name="line-13"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-14"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-15"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>ordinalNub</span>
<a name="line-16"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IntSet</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntSet</span><span class='hs-layout'>)</span>
<a name="line-19"></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'>IntSet</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>IntSet</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-cpp'>#ifdef HLINT</span>
<a name="line-22"></a><span class='hs-comment'>{-# ANN module "HLint: ignore Redundant bracket" #-}</span>
<a name="line-23"></a><span class='hs-cpp'>#endif</span>
<a name="line-24"></a>
<a name="line-25"></a><a name="ordinalNub"></a><span class='hs-comment'>-- | Return the the subset of given ordinals within a given bound</span>
<a name="line-26"></a><span class='hs-comment'>-- and in order of the first occurrence seen.</span>
<a name="line-27"></a><span class='hs-comment'>--</span>
<a name="line-28"></a><span class='hs-comment'>-- Bound: @0 <= x < l@</span>
<a name="line-29"></a><span class='hs-comment'>--</span>
<a name="line-30"></a><span class='hs-comment'>-- >>> ordinalNub 3 [-1,2,1,4,2,3]</span>
<a name="line-31"></a><span class='hs-comment'>-- [2,1]</span>
<a name="line-32"></a><span class='hs-definition'>ordinalNub</span> <span class='hs-keyglyph'>::</span>
<a name="line-33"></a> <span class='hs-conid'>Int</span> <span class='hs-comment'>{- ^ strict upper bound -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-34"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>{- ^ ordinals -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-35"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>{- ^ unique, in-bound ordinals, in order seen -}</span>
<a name="line-36"></a><span class='hs-definition'>ordinalNub</span> <span class='hs-varid'>l</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>ordinalNubHelper</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-conid'>IntSet</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="ordinalNubHelper"></a><span class='hs-definition'>ordinalNubHelper</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>IntSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>IntSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-39"></a><span class='hs-definition'>ordinalNubHelper</span> <span class='hs-varid'>l</span> <span class='hs-varid'>x</span> <span class='hs-varid'>next</span> <span class='hs-varid'>seen</span>
<a name="line-40"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>outOfBounds</span> <span class='hs-varop'>||</span> <span class='hs-varid'>notUnique</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>next</span> <span class='hs-varid'>seen</span>
<a name="line-41"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntSet</span><span class='hs-varop'>.</span><span class='hs-varid'>insert</span> <span class='hs-varid'>x</span> <span class='hs-varid'>seen</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-keyword'>where</span>
<a name="line-43"></a> <span class='hs-varid'>outOfBounds</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-varid'>l</span> <span class='hs-varop'><=</span> <span class='hs-varid'>x</span>
<a name="line-44"></a> <span class='hs-varid'>notUnique</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`</span><span class='hs-conid'>IntSet</span><span class='hs-varop'>.</span><span class='hs-varid'>member</span><span class='hs-varop'>`</span> <span class='hs-varid'>seen</span>
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