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<pre><a name="line-1"></a><span class='hs-comment'>{-
<a name="line-2"></a>Copyright (C) 2006-2008 John Goerzen <jgoerzen@complete.org>
<a name="line-3"></a>
<a name="line-4"></a>This program is free software; you can redistribute it and/or modify
<a name="line-5"></a>it under the terms of the GNU General Public License as published by
<a name="line-6"></a>the Free Software Foundation; either version 2 of the License, or
<a name="line-7"></a>(at your option) any later version.
<a name="line-8"></a>
<a name="line-9"></a>This program is distributed in the hope that it will be useful,
<a name="line-10"></a>but WITHOUT ANY WARRANTY; without even the implied warranty of
<a name="line-11"></a>MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
<a name="line-12"></a>GNU General Public License for more details.
<a name="line-13"></a>
<a name="line-14"></a>You should have received a copy of the GNU General Public License
<a name="line-15"></a>along with this program; if not, write to the Free Software
<a name="line-16"></a>Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
<a name="line-17"></a>-}</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-comment'>{- |
<a name="line-20"></a> Module : Data.Quantity
<a name="line-21"></a> Copyright : Copyright (C) 2006-2008 John Goerzen
<a name="line-22"></a> License : GNU GPL, version 2 or above
<a name="line-23"></a>
<a name="line-24"></a> Maintainer : John Goerzen <jgoerzen@complete.org>
<a name="line-25"></a> Stability : provisional
<a name="line-26"></a> Portability: portable
<a name="line-27"></a>
<a name="line-28"></a>Tools for rendering sizes
<a name="line-29"></a>
<a name="line-30"></a>Written by John Goerzen, jgoerzen\@complete.org -}</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Quantity</span> <span class='hs-layout'>(</span>
<a name="line-33"></a> <span class='hs-varid'>renderNum</span><span class='hs-layout'>,</span>
<a name="line-34"></a> <span class='hs-varid'>renderNums</span><span class='hs-layout'>,</span>
<a name="line-35"></a> <span class='hs-varid'>parseNum</span><span class='hs-layout'>,</span>
<a name="line-36"></a> <span class='hs-varid'>parseNumInt</span><span class='hs-layout'>,</span>
<a name="line-37"></a> <span class='hs-varid'>quantifyNum</span><span class='hs-layout'>,</span>
<a name="line-38"></a> <span class='hs-varid'>quantifyNums</span><span class='hs-layout'>,</span>
<a name="line-39"></a> <span class='hs-conid'>SizeOpts</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-40"></a> <span class='hs-varid'>binaryOpts</span><span class='hs-layout'>,</span>
<a name="line-41"></a> <span class='hs-varid'>siOpts</span>
<a name="line-42"></a> <span class='hs-layout'>)</span>
<a name="line-43"></a>
<a name="line-44"></a><span class='hs-keyword'>where</span>
<a name="line-45"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Printf</span>
<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="SizeOpts"></a><span class='hs-comment'>{- | The options for 'quantifyNum' and 'renderNum' -}</span>
<a name="line-50"></a><a name="SizeOpts"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>SizeOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SizeOpts</span> <span class='hs-layout'>{</span> <span class='hs-varid'>base</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ^ The base from which calculations are made</span>
<a name="line-51"></a> <span class='hs-varid'>powerIncr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ^ The increment to the power for each new suffix</span>
<a name="line-52"></a> <span class='hs-varid'>firstPower</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ^ The first power for which suffixes are given</span>
<a name="line-53"></a> <span class='hs-varid'>suffixes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The suffixes themselves</span>
<a name="line-54"></a> <span class='hs-layout'>}</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="binaryOpts"></a><span class='hs-comment'>{- | Predefined definitions for byte measurement in groups of 1024, from 0 to
<a name="line-57"></a>2**80 -}</span>
<a name="line-58"></a><span class='hs-definition'>binaryOpts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SizeOpts</span>
<a name="line-59"></a><span class='hs-definition'>binaryOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SizeOpts</span> <span class='hs-layout'>{</span><span class='hs-varid'>base</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>2</span><span class='hs-layout'>,</span>
<a name="line-60"></a> <span class='hs-varid'>firstPower</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span><span class='hs-layout'>,</span>
<a name="line-61"></a> <span class='hs-varid'>suffixes</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>" KMGTPEZY"</span><span class='hs-layout'>,</span>
<a name="line-62"></a> <span class='hs-varid'>powerIncr</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>10</span><span class='hs-layout'>}</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="siOpts"></a><span class='hs-comment'>{- | Predefined definitions for SI measurement, from 10**-24 to 10**24. -}</span>
<a name="line-65"></a><span class='hs-definition'>siOpts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SizeOpts</span>
<a name="line-66"></a><span class='hs-definition'>siOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SizeOpts</span> <span class='hs-layout'>{</span><span class='hs-varid'>base</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>10</span><span class='hs-layout'>,</span>
<a name="line-67"></a> <span class='hs-varid'>firstPower</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-</span><span class='hs-num'>24</span><span class='hs-layout'>,</span>
<a name="line-68"></a> <span class='hs-varid'>suffixes</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"yzafpnum kMGTPEZY"</span><span class='hs-layout'>,</span>
<a name="line-69"></a> <span class='hs-varid'>powerIncr</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>3</span><span class='hs-layout'>}</span>
<a name="line-70"></a>
<a name="line-71"></a><a name="quantifyNum"></a><span class='hs-comment'>{- | Takes a number and returns a new (quantity, suffix) combination.
<a name="line-72"></a>The space character is used as the suffix for items around 0. -}</span>
<a name="line-73"></a><span class='hs-definition'>quantifyNum</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ord</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Real</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Floating</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SizeOpts</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-74"></a><span class='hs-definition'>quantifyNum</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>quantifyNums</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span>
<a name="line-75"></a>
<a name="line-76"></a><a name="quantifyNums"></a><span class='hs-comment'>{- | Like 'quantifyNum', but takes a list of numbers. The first number in
<a name="line-77"></a>the list will be evaluated for the suffix. The same suffix and scale will
<a name="line-78"></a>be used for the remaining items in the list. Please see 'renderNums' for
<a name="line-79"></a>an example of how this works.
<a name="line-80"></a>
<a name="line-81"></a>It is invalid to use this function on an empty list. -}</span>
<a name="line-82"></a><span class='hs-definition'>quantifyNums</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ord</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Real</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Floating</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SizeOpts</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-83"></a><span class='hs-definition'>quantifyNums</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"Attempt to use quantifyNums on an empty list"</span>
<a name="line-84"></a><span class='hs-definition'>quantifyNums</span> <span class='hs-varid'>opts</span> <span class='hs-layout'>(</span><span class='hs-varid'>headnum</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-85"></a> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>procnum</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>headnum</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>suffix</span><span class='hs-layout'>)</span>
<a name="line-86"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>number</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>fromRational</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toRational</span> <span class='hs-varop'>$</span> <span class='hs-varid'>headnum</span> <span class='hs-keyword'>of</span>
<a name="line-87"></a> <span class='hs-num'>0</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>1</span>
<a name="line-88"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-89"></a> <span class='hs-varid'>incrList</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>idx2pwr</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-varid'>suffixes</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-keyglyph'>]</span>
<a name="line-90"></a> <span class='hs-varid'>incrIdxList</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zip</span> <span class='hs-varid'>incrList</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span>
<a name="line-91"></a> <span class='hs-varid'>idx2pwr</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-varop'>*</span> <span class='hs-varid'>powerIncr</span> <span class='hs-varid'>opts</span> <span class='hs-varop'>+</span> <span class='hs-varid'>firstPower</span> <span class='hs-varid'>opts</span>
<a name="line-92"></a> <span class='hs-varid'>finderfunc</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>base</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-varop'>**</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-93"></a> <span class='hs-varop'><=</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-varid'>number</span><span class='hs-layout'>)</span>
<a name="line-94"></a> <span class='hs-comment'>-- Find the largest item that does not exceed the number given.</span>
<a name="line-95"></a> <span class='hs-comment'>-- If the number is larger than the larger item in the list,</span>
<a name="line-96"></a> <span class='hs-comment'>-- that's fine; we'll just write it in terms of what we have.</span>
<a name="line-97"></a>
<a name="line-98"></a> <span class='hs-layout'>(</span><span class='hs-varid'>usedexp</span><span class='hs-layout'>,</span> <span class='hs-varid'>expidx</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-99"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>find</span> <span class='hs-varid'>finderfunc</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>incrIdxList</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-100"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-101"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>head</span> <span class='hs-varid'>incrIdxList</span> <span class='hs-comment'>-- If not found, it's smaller than the first</span>
<a name="line-102"></a> <span class='hs-varid'>suffix</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>suffixes</span> <span class='hs-varid'>opts</span> <span class='hs-varop'>!!</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>expidx</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-varid'>procnum</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromRational</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toRational</span> <span class='hs-varop'>$</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varop'>/</span>
<a name="line-104"></a> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>base</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-varop'>**</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>usedexp</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-105"></a> <span class='hs-comment'>--(posres, possuf) = quantifyNum opts (headnum * (-1))</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="renderNum"></a><span class='hs-comment'>{- | Render a number into a string, based on the given quantities. This is
<a name="line-108"></a>useful for displaying quantities in terms of bytes or in SI units. Give this
<a name="line-109"></a>function the 'SizeOpts' for the desired output, and a precision (number of
<a name="line-110"></a>digits to the right of the decimal point), and you get a string output.
<a name="line-111"></a>
<a name="line-112"></a>Here are some examples:
<a name="line-113"></a>
<a name="line-114"></a>> Data.Quantity> renderNum binaryOpts 0 1048576
<a name="line-115"></a>> "1M"
<a name="line-116"></a>> Data.Quantity> renderNum binaryOpts 2 10485760
<a name="line-117"></a>> "10.00M"
<a name="line-118"></a>> Data.Quantity> renderNum binaryOpts 3 1048576
<a name="line-119"></a>> "1.000M"
<a name="line-120"></a>> Data.Quantity> renderNum binaryOpts 3 1500000
<a name="line-121"></a>> "1.431M"
<a name="line-122"></a>> Data.Quantity> renderNum binaryOpts 2 (1500 ** 3)
<a name="line-123"></a>> "3.14G"
<a name="line-124"></a>
<a name="line-125"></a>> Data.Quantity> renderNum siOpts 2 1024
<a name="line-126"></a>> "1.02k"
<a name="line-127"></a>> Data.Quantity> renderNum siOpts 2 1048576
<a name="line-128"></a>> "1.05M"
<a name="line-129"></a>> Data.Quantity> renderNum siOpts 2 0.001
<a name="line-130"></a>> "1.00m"
<a name="line-131"></a>> Data.Quantity> renderNum siOpts 2 0.0001
<a name="line-132"></a>> "100.00u"
<a name="line-133"></a>
<a name="line-134"></a>If you want more control over the output, see 'quantifyNum'. -}</span>
<a name="line-135"></a><span class='hs-definition'>renderNum</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ord</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Real</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-136"></a> <span class='hs-conid'>SizeOpts</span>
<a name="line-137"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Precision of the result</span>
<a name="line-138"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ The number to examine</span>
<a name="line-139"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-140"></a><span class='hs-definition'>renderNum</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>prec</span> <span class='hs-varid'>number</span> <span class='hs-keyglyph'>=</span>
<a name="line-141"></a> <span class='hs-layout'>(</span><span class='hs-varid'>printf</span> <span class='hs-layout'>(</span><span class='hs-str'>"%."</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>prec</span> <span class='hs-varop'>++</span> <span class='hs-str'>"g"</span><span class='hs-layout'>)</span> <span class='hs-varid'>num</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>suffix</span><span class='hs-keyglyph'>]</span>
<a name="line-142"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>num</span><span class='hs-layout'>,</span> <span class='hs-varid'>suffix</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>quantifyNum</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>number</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>::</span><span class='hs-layout'>(</span><span class='hs-conid'>Double</span><span class='hs-layout'>,</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-143"></a>
<a name="line-144"></a><a name="renderNums"></a><span class='hs-comment'>{- | Like 'renderNum', but operates on a list of numbers. The first number
<a name="line-145"></a>in the list will be evaluated for the suffix. The same suffix and scale will
<a name="line-146"></a>be used for the remaining items in the list. See 'renderNum' for more
<a name="line-147"></a>examples.
<a name="line-148"></a>
<a name="line-149"></a>Also, unlike 'renderNum', the %f instead of %g printf format is used so that
<a name="line-150"></a>\"scientific\" notation is avoided in the output.
<a name="line-151"></a>
<a name="line-152"></a>Examples:
<a name="line-153"></a>
<a name="line-154"></a>> *Data.Quantity> renderNums binaryOpts 3 [1500000, 10240, 104857600]
<a name="line-155"></a>> ["1.431M","0.010M","100.000M"]
<a name="line-156"></a>> *Data.Quantity> renderNums binaryOpts 3 [1500, 10240, 104857600]
<a name="line-157"></a>> ["1.465K","10.000K","102400.000K"]
<a name="line-158"></a>
<a name="line-159"></a>-}</span>
<a name="line-160"></a><span class='hs-definition'>renderNums</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ord</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Real</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-161"></a> <span class='hs-conid'>SizeOpts</span>
<a name="line-162"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Prevision of the result</span>
<a name="line-163"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ The numbers to examine</span>
<a name="line-164"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ Result</span>
<a name="line-165"></a><span class='hs-definition'>renderNums</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>prec</span> <span class='hs-varid'>numbers</span> <span class='hs-keyglyph'>=</span>
<a name="line-166"></a> <span class='hs-varid'>map</span> <span class='hs-varid'>printit</span> <span class='hs-varid'>convnums</span>
<a name="line-167"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>printit</span> <span class='hs-varid'>num</span> <span class='hs-keyglyph'>=</span>
<a name="line-168"></a> <span class='hs-layout'>(</span><span class='hs-varid'>printf</span> <span class='hs-layout'>(</span><span class='hs-str'>"%."</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>prec</span> <span class='hs-varop'>++</span> <span class='hs-str'>"f"</span><span class='hs-layout'>)</span> <span class='hs-varid'>num</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>suffix</span><span class='hs-keyglyph'>]</span>
<a name="line-169"></a> <span class='hs-layout'>(</span><span class='hs-varid'>convnums</span><span class='hs-layout'>,</span> <span class='hs-varid'>suffix</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-170"></a> <span class='hs-layout'>(</span><span class='hs-varid'>quantifyNums</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>numbers</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>::</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Double</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-171"></a>
<a name="line-172"></a><a name="parseNum"></a><span class='hs-comment'>{- | Parses a String, possibly generated by 'renderNum'. Parses the suffix
<a name="line-173"></a>and applies it to the number, which is read via the Read class.
<a name="line-174"></a>
<a name="line-175"></a>Returns Left "error message" on error, or Right number on successful parse.
<a name="line-176"></a>
<a name="line-177"></a>If you want an Integral result, the convenience function 'parseNumInt' is for
<a name="line-178"></a>you.
<a name="line-179"></a>-}</span>
<a name="line-180"></a><span class='hs-definition'>parseNum</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Fractional</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-181"></a> <span class='hs-conid'>SizeOpts</span> <span class='hs-comment'>-- ^ Information on how to parse this data</span>
<a name="line-182"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- ^ Whether to perform a case-insensitive match</span>
<a name="line-183"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The string to parse</span>
<a name="line-184"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span>
<a name="line-185"></a><span class='hs-definition'>parseNum</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>insensitive</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span>
<a name="line-186"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>reads</span> <span class='hs-varid'>inp</span> <span class='hs-keyword'>of</span>
<a name="line-187"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-str'>"Couldn't parse numeric component of input"</span>
<a name="line-188"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>num</span><span class='hs-layout'>,</span> <span class='hs-str'>""</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-varid'>num</span> <span class='hs-comment'>-- No suffix; pass number unhindered</span>
<a name="line-189"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>num</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>suffix</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span>
<a name="line-190"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookup</span> <span class='hs-layout'>(</span><span class='hs-varid'>caseTransformer</span> <span class='hs-varid'>suffix</span><span class='hs-layout'>)</span> <span class='hs-varid'>suffixMap</span> <span class='hs-keyword'>of</span>
<a name="line-191"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Unrecognized suffix "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>suffix</span>
<a name="line-192"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>power</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-varop'>$</span> <span class='hs-varid'>num</span> <span class='hs-varop'>*</span> <span class='hs-varid'>multiplier</span> <span class='hs-varid'>power</span>
<a name="line-193"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>suffix</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Multi-character suffix "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>suffix</span>
<a name="line-194"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-str'>"Multiple parses for input"</span>
<a name="line-195"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>suffixMap</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zip</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>caseTransformer</span> <span class='hs-varop'>.</span> <span class='hs-varid'>suffixes</span> <span class='hs-varop'>$</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span>
<a name="line-196"></a> <span class='hs-layout'>(</span><span class='hs-varid'>iterate</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-varid'>powerIncr</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>firstPower</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-197"></a> <span class='hs-varid'>caseTransformer</span> <span class='hs-varid'>x</span>
<a name="line-198"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>insensitive</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toLower</span> <span class='hs-varid'>x</span>
<a name="line-199"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-200"></a> <span class='hs-varid'>multiplier</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Fractional</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-201"></a> <span class='hs-varid'>multiplier</span> <span class='hs-varid'>power</span> <span class='hs-keyglyph'>=</span>
<a name="line-202"></a> <span class='hs-varid'>fromRational</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toRational</span> <span class='hs-varop'>$</span>
<a name="line-203"></a> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>base</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-varop'>**</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>power</span>
<a name="line-204"></a><a name="parseNumInt"></a><span class='hs-comment'>{- | Parse a number as with 'parseNum', but return the result as
<a name="line-205"></a>an 'Integral'. Any type such as Integer, Int, etc. can be used for the
<a name="line-206"></a>result type.
<a name="line-207"></a>
<a name="line-208"></a>This function simply calls 'round' on the result of 'parseNum'. A
<a name="line-209"></a>'Double' is used internally for the parsing of the numeric component.
<a name="line-210"></a>
<a name="line-211"></a>By using this function, a user can still say something like 1.5M and get an
<a name="line-212"></a>integral result. -}</span>
<a name="line-213"></a><span class='hs-definition'>parseNumInt</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-214"></a> <span class='hs-conid'>SizeOpts</span> <span class='hs-comment'>-- ^ Information on how to parse this data</span>
<a name="line-215"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- ^ Whether to perform a case-insensitive match</span>
<a name="line-216"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The string to parse</span>
<a name="line-217"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span>
<a name="line-218"></a><span class='hs-definition'>parseNumInt</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>insensitive</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span>
<a name="line-219"></a> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseNum</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>insensitive</span> <span class='hs-varid'>inp</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>::</span><span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-conid'>Double</span> <span class='hs-keyword'>of</span>
<a name="line-220"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-varid'>x</span>
<a name="line-221"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>round</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
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