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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE TemplateHaskell #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-incomplete-patterns #-}</span>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : Data.TypeLevel.Num.Aliases</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) 2008 Alfonso Acosta, Oleg Kiselyov, Wolfgang Jeltsch</span>
<a name="line-7"></a><span class='hs-comment'>-- and KTH's SAM group </span>
<a name="line-8"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-9"></a><span class='hs-comment'>-- </span>
<a name="line-10"></a><span class='hs-comment'>-- Maintainer : alfonso.acosta@gmail.com</span>
<a name="line-11"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-12"></a><span class='hs-comment'>-- Portability : non-portable (Template Haskell)</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- Internal template haskell functions to generate type-level numeral aliases</span>
<a name="line-15"></a><span class='hs-comment'>-- </span>
<a name="line-16"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-17"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeLevel</span><span class='hs-varop'>.</span><span class='hs-conid'>Num</span><span class='hs-varop'>.</span><span class='hs-conid'>Aliases</span><span class='hs-varop'>.</span><span class='hs-conid'>TH</span> <span class='hs-layout'>(</span><span class='hs-varid'>genAliases</span><span class='hs-layout'>,</span> <span class='hs-varid'>dec2TypeLevel</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>TH</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeLevel</span><span class='hs-varop'>.</span><span class='hs-conid'>Num</span><span class='hs-varop'>.</span><span class='hs-conid'>Reps</span>
<a name="line-22"></a>
<a name="line-23"></a><a name="Base"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Base</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Bin</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Oct</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Hex</span>
<a name="line-24"></a>
<a name="line-25"></a><a name="base2Int"></a><span class='hs-definition'>base2Int</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Base</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-26"></a><span class='hs-definition'>base2Int</span> <span class='hs-conid'>Bin</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>2</span>
<a name="line-27"></a><span class='hs-definition'>base2Int</span> <span class='hs-conid'>Oct</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>8</span>
<a name="line-28"></a><span class='hs-definition'>base2Int</span> <span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>10</span>
<a name="line-29"></a><span class='hs-definition'>base2Int</span> <span class='hs-conid'>Hex</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>16</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-comment'>-- This module needs to be separated from Data.TypeLevel.Num.Aliases due to</span>
<a name="line-32"></a><span class='hs-comment'>-- a limitation in Template Haskell implementation: </span>
<a name="line-33"></a><span class='hs-comment'>-- "You can only run a function at compile time if it is imported from another </span>
<a name="line-34"></a><span class='hs-comment'>-- module." </span>
<a name="line-35"></a>
<a name="line-36"></a><a name="genAliases"></a><span class='hs-definition'>genAliases</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- how many binary aliases </span>
<a name="line-37"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- how many octal aliases</span>
<a name="line-38"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- how many dec aliases</span>
<a name="line-39"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- how many hex aliases</span>
<a name="line-40"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span>
<a name="line-41"></a><span class='hs-definition'>genAliases</span> <span class='hs-varid'>nb</span> <span class='hs-varid'>no</span> <span class='hs-varid'>nd</span> <span class='hs-varid'>nh</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>genAliases'</span> <span class='hs-varid'>nb</span> <span class='hs-varid'>no</span> <span class='hs-varid'>nd</span> <span class='hs-varid'>nh</span> <span class='hs-layout'>(</span><span class='hs-varid'>maximum</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>nb</span><span class='hs-layout'>,</span><span class='hs-varid'>no</span><span class='hs-layout'>,</span><span class='hs-varid'>nd</span><span class='hs-layout'>,</span><span class='hs-varid'>nh</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="genAliases'"></a><span class='hs-definition'>genAliases'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- how many binary aliases </span>
<a name="line-44"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- how many octal aliases</span>
<a name="line-45"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- how many dec aliases</span>
<a name="line-46"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- how many hex aliases</span>
<a name="line-47"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- maximum alias</span>
<a name="line-48"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span>
<a name="line-49"></a><span class='hs-comment'>-- FIXME: genAliases' is ugly!</span>
<a name="line-50"></a><span class='hs-definition'>genAliases'</span> <span class='hs-varid'>nb</span> <span class='hs-varid'>no</span> <span class='hs-varid'>nd</span> <span class='hs-varid'>nh</span> <span class='hs-varid'>curr</span>
<a name="line-51"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>curr</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-52"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span>
<a name="line-53"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>genAliases'</span> <span class='hs-varid'>nb</span> <span class='hs-varid'>no</span> <span class='hs-varid'>nd</span> <span class='hs-varid'>nh</span> <span class='hs-layout'>(</span><span class='hs-varid'>curr</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-comment'>-- binaries</span>
<a name="line-55"></a> <span class='hs-varid'>restb</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>addAliasBase</span> <span class='hs-layout'>(</span><span class='hs-varid'>curr</span> <span class='hs-varop'>></span> <span class='hs-varid'>nb</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-chr'>'b'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>bStr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-chr'>'B'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>bStr</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span>
<a name="line-56"></a> <span class='hs-comment'>-- octals</span>
<a name="line-57"></a> <span class='hs-varid'>resto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>addAliasBase</span> <span class='hs-layout'>(</span><span class='hs-varid'>curr</span> <span class='hs-varop'>></span> <span class='hs-varid'>no</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-chr'>'o'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>oStr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-chr'>'O'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>oStr</span><span class='hs-layout'>)</span> <span class='hs-varid'>restb</span>
<a name="line-58"></a> <span class='hs-comment'>-- decimals, we don't aliases of the decimal digits</span>
<a name="line-59"></a> <span class='hs-comment'>-- (they are alredy defined in the representation module)</span>
<a name="line-60"></a> <span class='hs-varid'>restd</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>curr</span> <span class='hs-varop'>></span> <span class='hs-varid'>nd</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>resto</span>
<a name="line-61"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>genValAlias</span> <span class='hs-layout'>(</span><span class='hs-chr'>'d'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>dStr</span><span class='hs-layout'>)</span> <span class='hs-varid'>decRep</span>
<a name="line-62"></a> <span class='hs-varid'>typ</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>genTypeAlias</span> <span class='hs-layout'>(</span><span class='hs-chr'>'D'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>dStr</span><span class='hs-layout'>)</span> <span class='hs-varid'>decRep</span>
<a name="line-63"></a> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>curr</span> <span class='hs-varop'><</span> <span class='hs-num'>10</span><span class='hs-layout'>)</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>val</span> <span class='hs-conop'>:</span> <span class='hs-varid'>resto</span>
<a name="line-64"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>val</span> <span class='hs-conop'>:</span> <span class='hs-varid'>typ</span> <span class='hs-conop'>:</span> <span class='hs-varid'>resto</span>
<a name="line-65"></a> <span class='hs-comment'>-- hexadicimals</span>
<a name="line-66"></a> <span class='hs-varid'>addAliasBase</span> <span class='hs-layout'>(</span><span class='hs-varid'>curr</span> <span class='hs-varop'>></span> <span class='hs-varid'>no</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-chr'>'h'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>hStr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-chr'>'H'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>hStr</span><span class='hs-layout'>)</span> <span class='hs-varid'>restd</span>
<a name="line-67"></a>
<a name="line-68"></a> <span class='hs-keyword'>where</span> <span class='hs-comment'>-- Add aliases of certain base to the rest of aliases</span>
<a name="line-69"></a> <span class='hs-varid'>addAliasBase</span> <span class='hs-varid'>cond</span> <span class='hs-varid'>vStr</span> <span class='hs-varid'>tStr</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span>
<a name="line-70"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>cond</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>rest</span>
<a name="line-71"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>genValAlias</span> <span class='hs-varid'>vStr</span> <span class='hs-varid'>decRep</span>
<a name="line-72"></a> <span class='hs-varid'>typ</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>genTypeAlias</span> <span class='hs-varid'>tStr</span> <span class='hs-varid'>decRep</span>
<a name="line-73"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>val</span> <span class='hs-conop'>:</span> <span class='hs-varid'>typ</span> <span class='hs-conop'>:</span> <span class='hs-varid'>rest</span>
<a name="line-74"></a>
<a name="line-75"></a> <span class='hs-varid'>decRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dec2TypeLevel</span> <span class='hs-varid'>curr</span>
<a name="line-76"></a>
<a name="line-77"></a> <span class='hs-varid'>bStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toBase</span> <span class='hs-conid'>Bin</span> <span class='hs-varid'>curr</span>
<a name="line-78"></a> <span class='hs-varid'>oStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toBase</span> <span class='hs-conid'>Oct</span> <span class='hs-varid'>curr</span>
<a name="line-79"></a> <span class='hs-varid'>dStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toBase</span> <span class='hs-conid'>Dec</span> <span class='hs-varid'>curr</span>
<a name="line-80"></a> <span class='hs-varid'>hStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toBase</span> <span class='hs-conid'>Hex</span> <span class='hs-varid'>curr</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="dec2TypeLevel"></a><span class='hs-comment'>-- | Generate the type-level decimal representation for a value-level </span>
<a name="line-83"></a><span class='hs-comment'>-- natural number. </span>
<a name="line-84"></a><span class='hs-comment'>-- NOTE: This function could be useful by itself avoiding to generate </span>
<a name="line-85"></a><span class='hs-comment'>-- aliases. However, type-splicing is not yet supported by template haskell.</span>
<a name="line-86"></a><span class='hs-definition'>dec2TypeLevel</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-conid'>Type</span>
<a name="line-87"></a><span class='hs-definition'>dec2TypeLevel</span> <span class='hs-varid'>n</span>
<a name="line-88"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"natural number expected"</span>
<a name="line-89"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>10</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>of</span>
<a name="line-90"></a> <span class='hs-num'>0</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D0</span><span class='hs-layout'>;</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D1</span><span class='hs-layout'>;</span> <span class='hs-num'>2</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D2</span><span class='hs-layout'>;</span> <span class='hs-num'>3</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D3</span><span class='hs-layout'>;</span> <span class='hs-num'>4</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D4</span>
<a name="line-91"></a> <span class='hs-num'>5</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D5</span><span class='hs-layout'>;</span> <span class='hs-num'>6</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D6</span><span class='hs-layout'>;</span> <span class='hs-num'>7</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D7</span><span class='hs-layout'>;</span> <span class='hs-num'>8</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D8</span><span class='hs-layout'>;</span> <span class='hs-num'>9</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>D9</span>
<a name="line-92"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>conT</span> <span class='hs-varid'>name</span>
<a name="line-93"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>quotient</span><span class='hs-layout'>,</span> <span class='hs-varid'>reminder</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-varop'>`quotRem`</span> <span class='hs-num'>10</span>
<a name="line-94"></a> <span class='hs-varid'>remType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dec2TypeLevel</span> <span class='hs-varid'>reminder</span>
<a name="line-95"></a> <span class='hs-varid'>quotType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dec2TypeLevel</span> <span class='hs-varid'>quotient</span>
<a name="line-96"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>conT</span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-layout'>(</span><span class='hs-conop'>:*</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>`appT`</span> <span class='hs-varid'>quotType</span> <span class='hs-varop'>`appT`</span> <span class='hs-varid'>remType</span>
<a name="line-97"></a>
<a name="line-98"></a>
<a name="line-99"></a><a name="genTypeAlias"></a><span class='hs-comment'>-- | Generate a decimal type synonym alias</span>
<a name="line-100"></a><span class='hs-definition'>genTypeAlias</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-conid'>Dec</span>
<a name="line-101"></a><span class='hs-definition'>genTypeAlias</span> <span class='hs-varid'>str</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tySynD</span> <span class='hs-varid'>name</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>t</span>
<a name="line-102"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkName</span> <span class='hs-varop'>$</span> <span class='hs-varid'>str</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="genValAlias"></a><span class='hs-comment'>-- | Generate a decimal value-level reflected alias</span>
<a name="line-105"></a><span class='hs-definition'>genValAlias</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-conid'>Dec</span>
<a name="line-106"></a><span class='hs-definition'>genValAlias</span> <span class='hs-varid'>str</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>body</span>
<a name="line-107"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkName</span> <span class='hs-varop'>$</span> <span class='hs-varid'>str</span>
<a name="line-108"></a> <span class='hs-varid'>body</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>valD</span> <span class='hs-layout'>(</span><span class='hs-varid'>varP</span> <span class='hs-varid'>name</span><span class='hs-layout'>)</span>
<a name="line-109"></a> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-layout'>(</span><span class='hs-varid'>sigE</span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>|</span> <span class='hs-varid'>undefined</span> <span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-110"></a>
<a name="line-111"></a>
<a name="line-112"></a><a name="toBase"></a><span class='hs-comment'>-- | Print an integer in certain base</span>
<a name="line-113"></a><span class='hs-definition'>toBase</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Base</span> <span class='hs-comment'>-- base </span>
<a name="line-114"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- Number to print</span>
<a name="line-115"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-116"></a><span class='hs-definition'>toBase</span> <span class='hs-conid'>Dec</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>show</span> <span class='hs-varid'>n</span>
<a name="line-117"></a><span class='hs-definition'>toBase</span> <span class='hs-varid'>b</span> <span class='hs-varid'>n</span>
<a name="line-118"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'-'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>toBase</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-119"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-varid'>bi</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>int2Char</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span>
<a name="line-120"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>toBase</span> <span class='hs-varid'>b</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>int2Char</span> <span class='hs-varid'>currDigit</span><span class='hs-keyglyph'>]</span>
<a name="line-121"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>bi</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>base2Int</span> <span class='hs-varid'>b</span>
<a name="line-122"></a> <span class='hs-layout'>(</span><span class='hs-varid'>rest</span><span class='hs-layout'>,</span> <span class='hs-varid'>currDigit</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-varop'>`quotRem`</span> <span class='hs-varid'>bi</span>
<a name="line-123"></a>
<a name="line-124"></a><a name="int2Char"></a><span class='hs-comment'>-- | print the corresponding character of a digit</span>
<a name="line-125"></a><span class='hs-definition'>int2Char</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- Number to print</span>
<a name="line-126"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-127"></a><span class='hs-definition'>int2Char</span> <span class='hs-varid'>i</span>
<a name="line-128"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i'</span> <span class='hs-varop'><</span> <span class='hs-num'>10</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toEnum</span> <span class='hs-layout'>(</span><span class='hs-varid'>i'</span><span class='hs-varop'>+</span> <span class='hs-num'>48</span><span class='hs-layout'>)</span>
<a name="line-129"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toEnum</span> <span class='hs-layout'>(</span><span class='hs-varid'>i'</span> <span class='hs-varop'>+</span> <span class='hs-num'>55</span><span class='hs-layout'>)</span>
<a name="line-130"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>i'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>abs</span> <span class='hs-varid'>i</span>
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