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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2003 Peter Simons</span>
<a name="line-2"></a><span class='hs-comment'>-- Copyright (C) 2003 David Roundy</span>
<a name="line-3"></a><span class='hs-comment'>--</span>
<a name="line-4"></a><span class='hs-comment'>-- This program is free software; you can redistribute it and/or modify</span>
<a name="line-5"></a><span class='hs-comment'>-- it under the terms of the GNU General Public License as published by</span>
<a name="line-6"></a><span class='hs-comment'>-- the Free Software Foundation; either version 2, or (at your option)</span>
<a name="line-7"></a><span class='hs-comment'>-- any later version.</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- This program is distributed in the hope that it will be useful,</span>
<a name="line-10"></a><span class='hs-comment'>-- but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="line-11"></a><span class='hs-comment'>-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="line-12"></a><span class='hs-comment'>-- GNU General Public License for more details.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- You should have received a copy of the GNU General Public License</span>
<a name="line-15"></a><span class='hs-comment'>-- along with this program; see the file COPYING. If not, write to</span>
<a name="line-16"></a><span class='hs-comment'>-- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="line-17"></a><span class='hs-comment'>-- Boston, MA 02110-1301, USA.</span>
<a name="line-18"></a>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>IsoDate</span> <span class='hs-layout'>(</span> <span class='hs-varid'>getIsoDateTime</span><span class='hs-layout'>,</span> <span class='hs-varid'>readLocalDate</span><span class='hs-layout'>,</span> <span class='hs-varid'>readUTCDate</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-varid'>parseDate</span><span class='hs-layout'>,</span> <span class='hs-varid'>getLocalTz</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-varid'>englishDateTime</span><span class='hs-layout'>,</span> <span class='hs-varid'>englishInterval</span><span class='hs-layout'>,</span> <span class='hs-varid'>englishLast</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-varid'>iso8601_interval</span><span class='hs-layout'>,</span> <span class='hs-varid'>iso8601_duration</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-varid'>cleanLocalDate</span><span class='hs-layout'>,</span> <span class='hs-varid'>resetCalendar</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-conid'>MCalendarTime</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'>subtractFromMCal</span><span class='hs-layout'>,</span> <span class='hs-varid'>addToMCal</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-varid'>toMCalendarTime</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafeToCalendarTime</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-varid'>unsetTime</span><span class='hs-layout'>,</span> <span class='hs-conid'>TimeInterval</span>
<a name="line-28"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>ParserCombinators</span><span class='hs-varop'>.</span><span class='hs-conid'>Parsec</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Time</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span> <span class='hs-varid'>toUpper</span><span class='hs-layout'>,</span> <span class='hs-varid'>isDigit</span> <span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>)</span>
<a name="line-35"></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'>liftM2</span> <span class='hs-layout'>)</span>
<a name="line-36"></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'>B</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="TimeInterval"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>TimeInterval</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>CalendarTime</span><span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>CalendarTime</span><span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="readUTCDate"></a><span class='hs-comment'>-- | Read/interpret a date string, assuming UTC if timezone</span>
<a name="line-41"></a><span class='hs-comment'>-- is not specified in the string (see 'readDate')</span>
<a name="line-42"></a><span class='hs-comment'>-- Warning! This errors out if we fail to interpret the</span>
<a name="line-43"></a><span class='hs-comment'>-- date</span>
<a name="line-44"></a><span class='hs-definition'>readUTCDate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span>
<a name="line-45"></a><span class='hs-definition'>readUTCDate</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readDate</span> <span class='hs-num'>0</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="cleanLocalDate"></a><span class='hs-comment'>-- | Convert a date string into ISO 8601 format (yyyymmdd variant)</span>
<a name="line-48"></a><span class='hs-comment'>-- assuming local timezone if not specified in the string</span>
<a name="line-49"></a><span class='hs-comment'>-- Warning! This errors out if we fail to interpret the date</span>
<a name="line-50"></a><span class='hs-definition'>cleanLocalDate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-51"></a><span class='hs-definition'>cleanLocalDate</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showIsoDateTime</span> <span class='hs-varop'>.</span> <span class='hs-varid'>resetCalendar</span>
<a name="line-52"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>readDate</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafePerformIO</span> <span class='hs-varid'>getLocalTz</span><span class='hs-layout'>)</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="readLocalDate"></a><span class='hs-comment'>-- | Read/interpret a date string, assuming local timezone if not</span>
<a name="line-55"></a><span class='hs-comment'>-- specified in the string</span>
<a name="line-56"></a><span class='hs-definition'>readLocalDate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span>
<a name="line-57"></a><span class='hs-definition'>readLocalDate</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readDate</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafePerformIO</span> <span class='hs-varid'>getLocalTz</span><span class='hs-layout'>)</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="getLocalTz"></a><span class='hs-comment'>-- | Return the local timezone offset from UTC in seconds</span>
<a name="line-60"></a><span class='hs-definition'>getLocalTz</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Int</span>
<a name="line-61"></a><span class='hs-definition'>getLocalTz</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ctTZ</span> <span class='hs-varop'>`liftM`</span> <span class='hs-layout'>(</span><span class='hs-varid'>getClockTime</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>toCalendarTime</span><span class='hs-layout'>)</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="readDate"></a><span class='hs-comment'>-- | Parse a date string with 'parseDate'</span>
<a name="line-64"></a><span class='hs-comment'>-- Warning! This errors out if we fail to interpret the date</span>
<a name="line-65"></a><span class='hs-comment'>-- Uses its first argument as the default time zone.</span>
<a name="line-66"></a><span class='hs-definition'>readDate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span>
<a name="line-67"></a><span class='hs-definition'>readDate</span> <span class='hs-varid'>tz</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span>
<a name="line-68"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>parseDate</span> <span class='hs-varid'>tz</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>of</span>
<a name="line-69"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"bad date: "</span><span class='hs-varop'>++</span><span class='hs-varid'>d</span><span class='hs-varop'>++</span><span class='hs-str'>" - "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>e</span>
<a name="line-70"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>ct</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>resetCalendar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varid'>ct</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="parseDate"></a><span class='hs-comment'>-- | Parse a date string, assuming a default timezone if</span>
<a name="line-73"></a><span class='hs-comment'>-- the date string does not specify one. The date formats</span>
<a name="line-74"></a><span class='hs-comment'>-- understood are those of 'showIsoDateTime' and 'date_time'</span>
<a name="line-75"></a><span class='hs-definition'>parseDate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>ParseError</span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-76"></a><span class='hs-definition'>parseDate</span> <span class='hs-varid'>tz</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span>
<a name="line-77"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>length</span> <span class='hs-varid'>d</span> <span class='hs-varop'>>=</span> <span class='hs-num'>14</span> <span class='hs-varop'>&&</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>all</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>bd</span>
<a name="line-78"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toMCalendarTime</span> <span class='hs-varop'>$</span>
<a name="line-79"></a> <span class='hs-conid'>CalendarTime</span> <span class='hs-layout'>(</span><span class='hs-varid'>readI</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>take</span> <span class='hs-num'>4</span> <span class='hs-varid'>bd</span><span class='hs-layout'>)</span>
<a name="line-80"></a> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>readI</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>take</span> <span class='hs-num'>2</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>drop</span> <span class='hs-num'>4</span> <span class='hs-varid'>bd</span><span class='hs-layout'>)</span>
<a name="line-81"></a> <span class='hs-layout'>(</span><span class='hs-varid'>readI</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>take</span> <span class='hs-num'>2</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>drop</span> <span class='hs-num'>6</span> <span class='hs-varid'>bd</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- Day</span>
<a name="line-82"></a> <span class='hs-layout'>(</span><span class='hs-varid'>readI</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>take</span> <span class='hs-num'>2</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>drop</span> <span class='hs-num'>8</span> <span class='hs-varid'>bd</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- Hour</span>
<a name="line-83"></a> <span class='hs-layout'>(</span><span class='hs-varid'>readI</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>take</span> <span class='hs-num'>2</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>drop</span> <span class='hs-num'>10</span> <span class='hs-varid'>bd</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- Minute</span>
<a name="line-84"></a> <span class='hs-layout'>(</span><span class='hs-varid'>readI</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>take</span> <span class='hs-num'>2</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>drop</span> <span class='hs-num'>12</span> <span class='hs-varid'>bd</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- Second</span>
<a name="line-85"></a> <span class='hs-num'>0</span> <span class='hs-conid'>Sunday</span> <span class='hs-num'>0</span> <span class='hs-comment'>-- Picosecond, weekday and day of year unknown</span>
<a name="line-86"></a> <span class='hs-str'>"GMT"</span> <span class='hs-num'>0</span> <span class='hs-conid'>False</span>
<a name="line-87"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>dt</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>date_time</span> <span class='hs-varid'>tz</span><span class='hs-layout'>;</span> <span class='hs-varid'>eof</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span> <span class='hs-layout'>}</span>
<a name="line-88"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>parse</span> <span class='hs-varid'>dt</span> <span class='hs-str'>""</span> <span class='hs-varid'>d</span>
<a name="line-89"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>bd</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-num'>14</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-90"></a> <span class='hs-varid'>readI</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"parseDate: invalid date"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>readInt</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="showIsoDateTime"></a><span class='hs-comment'>-- | Display a 'CalendarTime' in the ISO 8601 format without any</span>
<a name="line-93"></a><span class='hs-comment'>-- separators, e.g. 20080825142503</span>
<a name="line-94"></a><span class='hs-definition'>showIsoDateTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-95"></a><span class='hs-definition'>showIsoDateTime</span> <span class='hs-varid'>ct</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>show</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ctYear</span> <span class='hs-varid'>ct</span>
<a name="line-96"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>twoDigit</span> <span class='hs-varop'>.</span> <span class='hs-varid'>show</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromEnum</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ctMonth</span> <span class='hs-varid'>ct</span>
<a name="line-97"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>twoDigit</span> <span class='hs-varop'>.</span> <span class='hs-varid'>show</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ctDay</span> <span class='hs-varid'>ct</span>
<a name="line-98"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>twoDigit</span> <span class='hs-varop'>.</span> <span class='hs-varid'>show</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ctHour</span> <span class='hs-varid'>ct</span>
<a name="line-99"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>twoDigit</span> <span class='hs-varop'>.</span> <span class='hs-varid'>show</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ctMin</span> <span class='hs-varid'>ct</span>
<a name="line-100"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>twoDigit</span> <span class='hs-varop'>.</span> <span class='hs-varid'>show</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ctSec</span> <span class='hs-varid'>ct</span>
<a name="line-101"></a> <span class='hs-keyglyph'>]</span>
<a name="line-102"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>twoDigit</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-103"></a> <span class='hs-varid'>twoDigit</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'0'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>x</span>
<a name="line-104"></a> <span class='hs-varid'>twoDigit</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-105"></a> <span class='hs-varid'>twoDigit</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="getIsoDateTime"></a><span class='hs-comment'>-- | The current time in the format returned by 'showIsoDateTime'</span>
<a name="line-108"></a><span class='hs-definition'>getIsoDateTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-109"></a><span class='hs-definition'>getIsoDateTime</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>showIsoDateTime</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toUTCTime</span><span class='hs-layout'>)</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>getClockTime</span>
<a name="line-110"></a>
<a name="line-111"></a><span class='hs-comment'>----- Parser Combinators ---------------------------------------------</span>
<a name="line-112"></a>
<a name="line-113"></a><a name="caseChar"></a><span class='hs-comment'>-- | Case-insensitive variant of Parsec's 'char' function.</span>
<a name="line-114"></a><span class='hs-definition'>caseChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GenParser</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Char</span>
<a name="line-115"></a><span class='hs-definition'>caseChar</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>satisfy</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>toUpper</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>toUpper</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-116"></a>
<a name="line-117"></a><a name="caseString"></a><span class='hs-comment'>-- | Case-insensitive variant of Parsec's 'string' function.</span>
<a name="line-118"></a><span class='hs-definition'>caseString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GenParser</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-119"></a><span class='hs-definition'>caseString</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapM_</span> <span class='hs-varid'>caseChar</span> <span class='hs-varid'>cs</span> <span class='hs-varop'><?></span> <span class='hs-varid'>cs</span>
<a name="line-120"></a>
<a name="line-121"></a><a name="manyN"></a><span class='hs-comment'>-- | Match a parser at least @n@ times.</span>
<a name="line-122"></a><span class='hs-definition'>manyN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GenParser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GenParser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span>
<a name="line-123"></a><span class='hs-definition'>manyN</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span>
<a name="line-124"></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'>return</span> <span class='hs-conid'>[]</span>
<a name="line-125"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM2</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'>count</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>many</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-126"></a>
<a name="line-127"></a><a name="manyNtoM"></a><span class='hs-comment'>-- | Match a parser at least @n@ times, but no more than @m@ times.</span>
<a name="line-128"></a><span class='hs-definition'>manyNtoM</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-conid'>GenParser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GenParser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span>
<a name="line-129"></a><span class='hs-definition'>manyNtoM</span> <span class='hs-varid'>n</span> <span class='hs-varid'>m</span> <span class='hs-varid'>p</span>
<a name="line-130"></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'>return</span> <span class='hs-conid'>[]</span>
<a name="line-131"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>></span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-132"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>count</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span>
<a name="line-133"></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'>foldr</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'>return</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <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'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>count</span> <span class='hs-varid'>x</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>m</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-134"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM2</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'>count</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>manyNtoM</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-135"></a>
<a name="line-136"></a>
<a name="line-137"></a><span class='hs-comment'>----- Date/Time Parser -----------------------------------------------</span>
<a name="line-138"></a>
<a name="line-139"></a><a name="date_time"></a><span class='hs-comment'>-- | Try each of these date parsers in the following order</span>
<a name="line-140"></a><span class='hs-comment'>--</span>
<a name="line-141"></a><span class='hs-comment'>-- (1) 'cvs_date_time'</span>
<a name="line-142"></a><span class='hs-comment'>--</span>
<a name="line-143"></a><span class='hs-comment'>-- (2) 'iso8601_date_time'</span>
<a name="line-144"></a><span class='hs-comment'>--</span>
<a name="line-145"></a><span class='hs-comment'>-- (3) 'old_date_time</span>
<a name="line-146"></a><span class='hs-definition'>date_time</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-147"></a><span class='hs-definition'>date_time</span> <span class='hs-varid'>tz</span> <span class='hs-keyglyph'>=</span>
<a name="line-148"></a> <span class='hs-varid'>choice</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toMCalendarTime</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>cvs_date_time</span> <span class='hs-varid'>tz</span><span class='hs-layout'>,</span>
<a name="line-149"></a> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>iso8601_date_time</span> <span class='hs-varid'>tz</span><span class='hs-layout'>,</span>
<a name="line-150"></a> <span class='hs-varid'>toMCalendarTime</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>old_date_time</span><span class='hs-keyglyph'>]</span>
<a name="line-151"></a>
<a name="line-152"></a><a name="cvs_date_time"></a><span class='hs-comment'>-- | CVS-style date/times, e.g.</span>
<a name="line-153"></a><span class='hs-comment'>-- 2007/08/25 14:25:39 GMT</span>
<a name="line-154"></a><span class='hs-comment'>-- Note that time-zones are optional here.</span>
<a name="line-155"></a><span class='hs-definition'>cvs_date_time</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>CalendarTime</span>
<a name="line-156"></a><span class='hs-definition'>cvs_date_time</span> <span class='hs-varid'>tz</span> <span class='hs-keyglyph'>=</span>
<a name="line-157"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>year</span>
<a name="line-158"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>'/'</span>
<a name="line-159"></a> <span class='hs-varid'>mon</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>month_num</span>
<a name="line-160"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>'/'</span>
<a name="line-161"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>day</span>
<a name="line-162"></a> <span class='hs-varid'>my_spaces</span>
<a name="line-163"></a> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>hour</span>
<a name="line-164"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>':'</span>
<a name="line-165"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>minute</span>
<a name="line-166"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>':'</span>
<a name="line-167"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>second</span>
<a name="line-168"></a> <span class='hs-varid'>z</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-varid'>tz</span> <span class='hs-varop'>$</span> <span class='hs-varid'>my_spaces</span> <span class='hs-varop'>>></span> <span class='hs-varid'>zone</span>
<a name="line-169"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>CalendarTime</span> <span class='hs-varid'>y</span> <span class='hs-varid'>mon</span> <span class='hs-varid'>d</span> <span class='hs-varid'>h</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-num'>0</span> <span class='hs-conid'>Monday</span> <span class='hs-num'>0</span> <span class='hs-str'>""</span> <span class='hs-varid'>z</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-170"></a>
<a name="line-171"></a><a name="old_date_time"></a><span class='hs-comment'>-- | \"Old\"-style dates, e.g.</span>
<a name="line-172"></a><span class='hs-comment'>-- Tue Jan 3 14:08:07 EST 1999</span>
<a name="line-173"></a><span class='hs-comment'>-- darcs-doc: Question (what does the "old" stand for really?)</span>
<a name="line-174"></a><span class='hs-definition'>old_date_time</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>CalendarTime</span>
<a name="line-175"></a><span class='hs-definition'>old_date_time</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>wd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>day_name</span>
<a name="line-176"></a> <span class='hs-varid'>my_spaces</span>
<a name="line-177"></a> <span class='hs-varid'>mon</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>month_name</span>
<a name="line-178"></a> <span class='hs-varid'>my_spaces</span>
<a name="line-179"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>day</span>
<a name="line-180"></a> <span class='hs-varid'>my_spaces</span>
<a name="line-181"></a> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>hour</span>
<a name="line-182"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>':'</span>
<a name="line-183"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>minute</span>
<a name="line-184"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>':'</span>
<a name="line-185"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>second</span>
<a name="line-186"></a> <span class='hs-varid'>my_spaces</span>
<a name="line-187"></a> <span class='hs-varid'>z</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>zone</span>
<a name="line-188"></a> <span class='hs-varid'>my_spaces</span>
<a name="line-189"></a> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>year</span>
<a name="line-190"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>CalendarTime</span> <span class='hs-varid'>y</span> <span class='hs-varid'>mon</span> <span class='hs-varid'>d</span> <span class='hs-varid'>h</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-num'>0</span> <span class='hs-varid'>wd</span> <span class='hs-num'>0</span> <span class='hs-str'>""</span> <span class='hs-varid'>z</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-191"></a>
<a name="line-192"></a><a name="iso8601_date_time"></a><span class='hs-comment'>-- | ISO 8601 dates and times. Please note the following flaws:</span>
<a name="line-193"></a><span class='hs-comment'>--</span>
<a name="line-194"></a><span class='hs-comment'>-- I am reluctant to implement:</span>
<a name="line-195"></a><span class='hs-comment'>--</span>
<a name="line-196"></a><span class='hs-comment'>-- * years > 9999</span>
<a name="line-197"></a><span class='hs-comment'>--</span>
<a name="line-198"></a><span class='hs-comment'>-- * truncated representations with implied century (89 for 1989) </span>
<a name="line-199"></a><span class='hs-comment'>--</span>
<a name="line-200"></a><span class='hs-comment'>-- I have not implemented:</span>
<a name="line-201"></a><span class='hs-comment'>--</span>
<a name="line-202"></a><span class='hs-comment'>-- * repeated durations (not relevant)</span>
<a name="line-203"></a><span class='hs-comment'>--</span>
<a name="line-204"></a><span class='hs-comment'>-- * lowest order component fractions in intervals</span>
<a name="line-205"></a><span class='hs-comment'>--</span>
<a name="line-206"></a><span class='hs-comment'>-- * negative dates (BC)</span>
<a name="line-207"></a><span class='hs-comment'>--</span>
<a name="line-208"></a><span class='hs-comment'>-- I have not verified or have left too relaxed:</span>
<a name="line-209"></a><span class='hs-comment'>--</span>
<a name="line-210"></a><span class='hs-comment'>-- * the difference between 24h and 0h</span>
<a name="line-211"></a><span class='hs-comment'>--</span>
<a name="line-212"></a><span class='hs-comment'>-- * allows stuff like 2005-1212; either you use the hyphen all the way </span>
<a name="line-213"></a><span class='hs-comment'>-- (2005-12-12) or you don't use it at all (20051212), but you don't use</span>
<a name="line-214"></a><span class='hs-comment'>-- it halfway, likewise with time</span>
<a name="line-215"></a><span class='hs-comment'>--</span>
<a name="line-216"></a><span class='hs-comment'>-- * No bounds checking whatsoever on intervals!</span>
<a name="line-217"></a><span class='hs-comment'>-- (next action: read iso doc to see if bounds-checking required?) -}</span>
<a name="line-218"></a><span class='hs-definition'>iso8601_date_time</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-219"></a><span class='hs-definition'>iso8601_date_time</span> <span class='hs-varid'>localTz</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-220"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>iso8601_date</span>
<a name="line-221"></a> <span class='hs-varid'>t</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-varid'>id</span> <span class='hs-varop'>$</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>optional</span> <span class='hs-varop'>$</span> <span class='hs-varid'>oneOf</span> <span class='hs-str'>" T"</span>
<a name="line-222"></a> <span class='hs-varid'>iso8601_time</span>
<a name="line-223"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>t</span> <span class='hs-varop'>$</span> <span class='hs-varid'>d</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctTZ</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>localTz</span> <span class='hs-layout'>}</span>
<a name="line-224"></a>
<a name="line-225"></a><a name="iso8601_date"></a><span class='hs-comment'>-- | Three types of ISO 8601 date:</span>
<a name="line-226"></a><span class='hs-comment'>--</span>
<a name="line-227"></a><span class='hs-comment'>-- * calendar date, e.g., 1997-07-17, 1997-07, 199707, 1997</span>
<a name="line-228"></a><span class='hs-comment'>--</span>
<a name="line-229"></a><span class='hs-comment'>-- * week+day in year, e.g., 1997-W32-4</span>
<a name="line-230"></a><span class='hs-comment'>--</span>
<a name="line-231"></a><span class='hs-comment'>-- * day in year, e.g, 1997-273</span>
<a name="line-232"></a><span class='hs-definition'>iso8601_date</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-233"></a><span class='hs-definition'>iso8601_date</span> <span class='hs-keyglyph'>=</span>
<a name="line-234"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>calendar_date</span> <span class='hs-varop'><|></span> <span class='hs-varid'>week_date</span> <span class='hs-varop'><|></span> <span class='hs-varid'>ordinal_date</span>
<a name="line-235"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span><span class='hs-layout'>)</span> <span class='hs-varid'>nullMCalendar</span> <span class='hs-varid'>d</span>
<a name="line-236"></a> <span class='hs-keyword'>where</span>
<a name="line-237"></a> <span class='hs-varid'>calendar_date</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-- yyyy-mm-dd</span>
<a name="line-238"></a> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>optchain</span> <span class='hs-varid'>year_</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>dash</span><span class='hs-layout'>,</span> <span class='hs-varid'>month_</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>dash</span><span class='hs-layout'>,</span> <span class='hs-varid'>day_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>]</span>
<a name="line-239"></a> <span class='hs-comment'>-- allow other variants to be parsed correctly </span>
<a name="line-240"></a> <span class='hs-varid'>notFollowedBy</span> <span class='hs-layout'>(</span><span class='hs-varid'>digit</span> <span class='hs-varop'><|></span> <span class='hs-varid'>char</span> <span class='hs-chr'>'W'</span><span class='hs-layout'>)</span>
<a name="line-241"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>d</span>
<a name="line-242"></a> <span class='hs-varid'>week_date</span> <span class='hs-keyglyph'>=</span> <span class='hs-varop'>--yyyy-Www-d</span>
<a name="line-243"></a> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>yfn</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>year_</span>
<a name="line-244"></a> <span class='hs-varid'>optional</span> <span class='hs-varid'>dash</span>
<a name="line-245"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>'W'</span>
<a name="line-246"></a> <span class='hs-comment'>-- offset human 'week 1' -> computer 'week 0'</span>
<a name="line-247"></a> <span class='hs-varid'>w'</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>two_digits</span>
<a name="line-248"></a> <span class='hs-varid'>mwd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-conid'>Nothing</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>optional</span> <span class='hs-varid'>dash</span><span class='hs-layout'>;</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>n_digits</span> <span class='hs-num'>1</span> <span class='hs-layout'>}</span>
<a name="line-249"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>resetCalendar</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varop'>.</span> <span class='hs-varid'>yfn</span> <span class='hs-varop'>$</span> <span class='hs-varid'>nullMCalendar</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-num'>1</span> <span class='hs-layout'>}</span>
<a name="line-250"></a> <span class='hs-varid'>firstDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ctWDay</span> <span class='hs-varid'>y</span>
<a name="line-251"></a> <span class='hs-comment'>-- things that make this complicated</span>
<a name="line-252"></a> <span class='hs-comment'>-- 1. iso8601 weeks start from Monday; Haskell weeks start from Sunday</span>
<a name="line-253"></a> <span class='hs-comment'>-- 2. the first week is the one that contains at least Thursday</span>
<a name="line-254"></a> <span class='hs-comment'>-- if the year starts after Thursday, then some days of the year</span>
<a name="line-255"></a> <span class='hs-comment'>-- will have already passed before the first week</span>
<a name="line-256"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>afterThursday</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>firstDay</span> <span class='hs-varop'>==</span> <span class='hs-conid'>Sunday</span> <span class='hs-varop'>||</span> <span class='hs-varid'>firstDay</span> <span class='hs-varop'>></span> <span class='hs-conid'>Thursday</span>
<a name="line-257"></a> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>afterThursday</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>w'</span><span class='hs-varop'>+</span><span class='hs-num'>1</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>w'</span>
<a name="line-258"></a> <span class='hs-varid'>yday</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>7</span> <span class='hs-varop'>*</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>1</span> <span class='hs-varid'>mwd</span>
<a name="line-259"></a> <span class='hs-varid'>diff</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctWeek</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-260"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctWDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toEnum</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>mwd</span>
<a name="line-261"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>yday</span> <span class='hs-layout'>}</span>
<a name="line-262"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>diff</span><span class='hs-varop'>.</span><span class='hs-varid'>yfn</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-263"></a> <span class='hs-varid'>ordinal_date</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-- yyyy-ddd</span>
<a name="line-264"></a> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>optchain</span> <span class='hs-varid'>year_</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>dash</span><span class='hs-layout'>,</span> <span class='hs-varid'>yearDay_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>]</span>
<a name="line-265"></a> <span class='hs-comment'>--</span>
<a name="line-266"></a> <span class='hs-varid'>year_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>four_digits</span> <span class='hs-varop'><?></span> <span class='hs-str'>"year (0000-9999)"</span>
<a name="line-267"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctYear</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>y</span> <span class='hs-layout'>}</span>
<a name="line-268"></a> <span class='hs-varid'>month_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>two_digits</span> <span class='hs-varop'><?></span> <span class='hs-str'>"month (1 to 12)"</span>
<a name="line-269"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctMonth</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>intToMonth</span> <span class='hs-varid'>m</span> <span class='hs-layout'>}</span>
<a name="line-270"></a> <span class='hs-varid'>day_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>two_digits</span> <span class='hs-varop'><?></span> <span class='hs-str'>"day in month (1 to 31)"</span>
<a name="line-271"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>d</span> <span class='hs-layout'>}</span>
<a name="line-272"></a> <span class='hs-varid'>yearDay_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>n_digits</span> <span class='hs-num'>3</span> <span class='hs-varop'><?></span> <span class='hs-str'>"day in year (001 to 366)"</span>
<a name="line-273"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>d</span>
<a name="line-274"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctYDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-275"></a> <span class='hs-varid'>dash</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'-'</span>
<a name="line-276"></a>
<a name="line-277"></a><a name="iso8601_time"></a><span class='hs-comment'>-- | Note that this returns a function which sets the time on</span>
<a name="line-278"></a><span class='hs-comment'>-- another calendar (see 'iso8601_date_time' for a list of</span>
<a name="line-279"></a><span class='hs-comment'>-- flaws</span>
<a name="line-280"></a><span class='hs-definition'>iso8601_time</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MCalendarTime</span><span class='hs-layout'>)</span>
<a name="line-281"></a><span class='hs-definition'>iso8601_time</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-282"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>optchain</span> <span class='hs-varid'>hour_</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>colon</span> <span class='hs-layout'>,</span> <span class='hs-varid'>min_</span><span class='hs-layout'>)</span>
<a name="line-283"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>colon</span> <span class='hs-layout'>,</span> <span class='hs-varid'>sec_</span><span class='hs-layout'>)</span>
<a name="line-284"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>oneOf</span> <span class='hs-str'>",."</span><span class='hs-layout'>,</span> <span class='hs-varid'>pico_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>]</span>
<a name="line-285"></a> <span class='hs-varid'>z</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-varid'>id</span> <span class='hs-varop'>$</span> <span class='hs-varid'>choice</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>zulu</span> <span class='hs-layout'>,</span> <span class='hs-varid'>offset</span> <span class='hs-keyglyph'>]</span>
<a name="line-286"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varop'>.</span><span class='hs-layout'>)</span> <span class='hs-varid'>id</span> <span class='hs-layout'>(</span><span class='hs-varid'>z</span><span class='hs-conop'>:</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span>
<a name="line-287"></a> <span class='hs-keyword'>where</span>
<a name="line-288"></a> <span class='hs-varid'>hour_</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>two_digits</span>
<a name="line-289"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctHour</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>h</span> <span class='hs-layout'>}</span>
<a name="line-290"></a> <span class='hs-varid'>min_</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>two_digits</span>
<a name="line-291"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctMin</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>m</span> <span class='hs-layout'>}</span>
<a name="line-292"></a> <span class='hs-varid'>sec_</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>two_digits</span>
<a name="line-293"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctSec</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>s</span> <span class='hs-layout'>}</span>
<a name="line-294"></a> <span class='hs-varid'>pico_</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>digs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many</span> <span class='hs-varid'>digit</span>
<a name="line-295"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>picoExp</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>12</span>
<a name="line-296"></a> <span class='hs-varid'>digsExp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>digs</span>
<a name="line-297"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>frac</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>digs</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-298"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>digsExp</span> <span class='hs-varop'>></span> <span class='hs-varid'>picoExp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>read</span> <span class='hs-varop'>$</span> <span class='hs-varid'>take</span> <span class='hs-varid'>picoExp</span> <span class='hs-varid'>digs</span>
<a name="line-299"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>10</span> <span class='hs-varop'>^</span> <span class='hs-layout'>(</span><span class='hs-varid'>picoExp</span> <span class='hs-comment'>-</span> <span class='hs-varid'>digsExp</span><span class='hs-layout'>)</span> <span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-varid'>read</span> <span class='hs-varid'>digs</span><span class='hs-layout'>)</span>
<a name="line-300"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctPicosec</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>frac</span> <span class='hs-layout'>}</span>
<a name="line-301"></a> <span class='hs-varid'>zulu</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'Z'</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctTZ</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-num'>0</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-302"></a> <span class='hs-varid'>offset</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>sign</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>choice</span> <span class='hs-keyglyph'>[</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'+'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-num'>1</span> <span class='hs-layout'>}</span>
<a name="line-303"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'-'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span> <span class='hs-keyglyph'>]</span>
<a name="line-304"></a> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>two_digits</span>
<a name="line-305"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>optional</span> <span class='hs-varid'>colon</span><span class='hs-layout'>;</span> <span class='hs-varid'>two_digits</span> <span class='hs-layout'>}</span>
<a name="line-306"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mctTZ</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>sign</span> <span class='hs-varop'>*</span> <span class='hs-num'>60</span> <span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-varop'>*</span><span class='hs-num'>60</span><span class='hs-layout'>)</span><span class='hs-varop'>+</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-307"></a> <span class='hs-varid'>colon</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>char</span> <span class='hs-chr'>':'</span>
<a name="line-308"></a>
<a name="line-309"></a><a name="iso8601_interval"></a><span class='hs-comment'>-- | Intervals in ISO 8601, e.g.,</span>
<a name="line-310"></a><span class='hs-comment'>--</span>
<a name="line-311"></a><span class='hs-comment'>-- * 2008-09/2012-08-17T16:30</span>
<a name="line-312"></a><span class='hs-comment'>--</span>
<a name="line-313"></a><span class='hs-comment'>-- * 2008-09/P2Y11MT16H30M</span>
<a name="line-314"></a><span class='hs-comment'>--</span>
<a name="line-315"></a><span class='hs-comment'>-- * P2Y11MT16H30M/2012-08-17T16:30</span>
<a name="line-316"></a><span class='hs-comment'>--</span>
<a name="line-317"></a><span class='hs-comment'>-- See 'iso8601_duration'</span>
<a name="line-318"></a><span class='hs-definition'>iso8601_interval</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-layout'>(</span><span class='hs-conid'>MCalendarTime</span><span class='hs-layout'>,</span> <span class='hs-conid'>MCalendarTime</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-319"></a><span class='hs-definition'>iso8601_interval</span> <span class='hs-varid'>localTz</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>leftDur</span> <span class='hs-varop'><|></span> <span class='hs-varid'>rightDur</span> <span class='hs-keyword'>where</span>
<a name="line-320"></a> <span class='hs-varid'>leftDur</span> <span class='hs-keyglyph'>=</span>
<a name="line-321"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>dur</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>iso8601_duration</span>
<a name="line-322"></a> <span class='hs-varid'>end</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-conid'>Nothing</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'/'</span><span class='hs-layout'>;</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>isoDt</span> <span class='hs-layout'>}</span>
<a name="line-323"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>end</span> <span class='hs-keyword'>of</span>
<a name="line-324"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-varid'>dur</span>
<a name="line-325"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>dur</span> <span class='hs-varop'>`subtractFromMCal`</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-326"></a> <span class='hs-varid'>rightDur</span> <span class='hs-keyglyph'>=</span>
<a name="line-327"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>start</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>isoDt</span>
<a name="line-328"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>'/'</span>
<a name="line-329"></a> <span class='hs-varid'>durOrEnd</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Left</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>iso8601_duration</span> <span class='hs-varop'><|></span> <span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>isoDt</span>
<a name="line-330"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>durOrEnd</span> <span class='hs-keyword'>of</span>
<a name="line-331"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>dur</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-layout'>,</span> <span class='hs-varid'>dur</span> <span class='hs-varop'>`addToMCal`</span> <span class='hs-varid'>start</span><span class='hs-layout'>)</span>
<a name="line-332"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>end</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-layout'>,</span> <span class='hs-varid'>end</span><span class='hs-layout'>)</span>
<a name="line-333"></a> <span class='hs-varid'>isoDt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso8601_date_time</span> <span class='hs-varid'>localTz</span>
<a name="line-334"></a>
<a name="line-335"></a><a name="iso8601_duration"></a><span class='hs-comment'>-- | Durations in ISO 8601, e.g.,</span>
<a name="line-336"></a><span class='hs-comment'>--</span>
<a name="line-337"></a><span class='hs-comment'>-- * P4Y (four years)</span>
<a name="line-338"></a><span class='hs-comment'>--</span>
<a name="line-339"></a><span class='hs-comment'>-- * P5M (five months)</span>
<a name="line-340"></a><span class='hs-comment'>--</span>
<a name="line-341"></a><span class='hs-comment'>-- * P4Y5M (four years and five months)</span>
<a name="line-342"></a><span class='hs-comment'>--</span>
<a name="line-343"></a><span class='hs-comment'>-- * P4YT3H6S (four years, three hours and six seconds)</span>
<a name="line-344"></a><span class='hs-definition'>iso8601_duration</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>TimeDiff</span>
<a name="line-345"></a><span class='hs-definition'>iso8601_duration</span> <span class='hs-keyglyph'>=</span>
<a name="line-346"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'P'</span>
<a name="line-347"></a> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>block</span> <span class='hs-num'>0</span> <span class='hs-chr'>'Y'</span>
<a name="line-348"></a> <span class='hs-varid'>mon</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>block</span> <span class='hs-num'>0</span> <span class='hs-chr'>'M'</span>
<a name="line-349"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>block</span> <span class='hs-num'>0</span> <span class='hs-chr'>'D'</span>
<a name="line-350"></a> <span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-layout'>,</span><span class='hs-varid'>m</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-varid'>option</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span><span class='hs-num'>0</span><span class='hs-layout'>,</span><span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-351"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'T'</span>
<a name="line-352"></a> <span class='hs-varid'>h'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>block</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-chr'>'H'</span>
<a name="line-353"></a> <span class='hs-varid'>m'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>block</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-chr'>'M'</span>
<a name="line-354"></a> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>block</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-chr'>'S'</span>
<a name="line-355"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>unset</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-356"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>all</span> <span class='hs-varid'>unset</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>h'</span><span class='hs-layout'>,</span><span class='hs-varid'>m'</span><span class='hs-layout'>,</span><span class='hs-varid'>s'</span><span class='hs-keyglyph'>]</span>
<a name="line-357"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"T should be omitted if time is unspecified"</span>
<a name="line-358"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>clear</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>unset</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyword'>then</span> <span class='hs-num'>0</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>x</span>
<a name="line-359"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>clear</span> <span class='hs-varid'>h'</span><span class='hs-layout'>,</span> <span class='hs-varid'>clear</span> <span class='hs-varid'>m'</span><span class='hs-layout'>,</span> <span class='hs-varid'>clear</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-360"></a> <span class='hs-comment'>--</span>
<a name="line-361"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-varid'>y</span> <span class='hs-varid'>mon</span> <span class='hs-varid'>d</span> <span class='hs-varid'>h</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-num'>0</span>
<a name="line-362"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>block</span> <span class='hs-varid'>d</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>option</span> <span class='hs-varid'>d</span> <span class='hs-varop'>$</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-363"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many1</span> <span class='hs-varid'>digit</span>
<a name="line-364"></a> <span class='hs-varid'>char</span> <span class='hs-varid'>c</span>
<a name="line-365"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>read</span> <span class='hs-varid'>n</span>
<a name="line-366"></a>
<a name="line-367"></a><a name="optchain"></a><span class='hs-comment'>-- | 'optchain' @p xs@ parses a string with the obligatory</span>
<a name="line-368"></a><span class='hs-comment'>-- parser @p@. If this suceeds, it continues on to the</span>
<a name="line-369"></a><span class='hs-comment'>-- rest of the input using the next parsers down the</span>
<a name="line-370"></a><span class='hs-comment'>-- chain. Each part of the chain consists of a parser</span>
<a name="line-371"></a><span class='hs-comment'>-- for a separator and for the content itself. The</span>
<a name="line-372"></a><span class='hs-comment'>-- separator is optional.</span>
<a name="line-373"></a><span class='hs-comment'>--</span>
<a name="line-374"></a><span class='hs-comment'>-- A good use of this function is to help in parsing ISO</span>
<a name="line-375"></a><span class='hs-comment'>-- ISO 8601 dates and times. For example, the parser</span>
<a name="line-376"></a><span class='hs-comment'>-- @optchain year [(dash, month), (dash, day)]@ accepts</span>
<a name="line-377"></a><span class='hs-comment'>-- dates like 2007 (only the year is used), 2007-07 (only</span>
<a name="line-378"></a><span class='hs-comment'>-- the year and month), 200707 (only the year and month</span>
<a name="line-379"></a><span class='hs-comment'>-- with no separator), 2007-07-19 (year, month and day).</span>
<a name="line-380"></a><span class='hs-definition'>optchain</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span>
<a name="line-381"></a><span class='hs-definition'>optchain</span> <span class='hs-varid'>p</span> <span class='hs-varid'>next</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-382"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>r1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>p</span>
<a name="line-383"></a> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-keyword'>of</span>
<a name="line-384"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-385"></a> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>sep</span><span class='hs-layout'>,</span><span class='hs-varid'>p2</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>next2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>option</span> <span class='hs-conid'>[]</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>optional</span> <span class='hs-varid'>sep</span><span class='hs-layout'>;</span> <span class='hs-varid'>optchain</span> <span class='hs-varid'>p2</span> <span class='hs-varid'>next2</span> <span class='hs-layout'>}</span>
<a name="line-386"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span><span class='hs-conop'>:</span><span class='hs-varid'>r2</span><span class='hs-layout'>)</span>
<a name="line-387"></a>
<a name="line-388"></a><a name="n_digits"></a><span class='hs-definition'>n_digits</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span>
<a name="line-389"></a><span class='hs-definition'>n_digits</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>read</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>count</span> <span class='hs-varid'>n</span> <span class='hs-varid'>digit</span>
<a name="line-390"></a>
<a name="line-391"></a><a name="two_digits"></a><span class='hs-definition'>two_digits</span><span class='hs-layout'>,</span> <span class='hs-varid'>four_digits</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span>
<a name="line-392"></a><span class='hs-definition'>two_digits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n_digits</span> <span class='hs-num'>2</span>
<a name="line-393"></a><a name="four_digits"></a><span class='hs-definition'>four_digits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n_digits</span> <span class='hs-num'>4</span>
<a name="line-394"></a>
<a name="line-395"></a><a name="my_spaces"></a><span class='hs-comment'>-- | One or more space.</span>
<a name="line-396"></a><span class='hs-comment'>-- WARNING! This only matches on the space character, not on</span>
<a name="line-397"></a><span class='hs-comment'>-- whitespace in general</span>
<a name="line-398"></a><span class='hs-definition'>my_spaces</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>String</span>
<a name="line-399"></a><span class='hs-definition'>my_spaces</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>manyN</span> <span class='hs-num'>1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>' '</span>
<a name="line-400"></a>
<a name="line-401"></a><a name="day_name"></a><span class='hs-comment'>-- | English three-letter day abbreviations (e.g. Mon, Tue, Wed)</span>
<a name="line-402"></a><span class='hs-definition'>day_name</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Day</span>
<a name="line-403"></a><span class='hs-definition'>day_name</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>choice</span>
<a name="line-404"></a> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Mon"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Monday</span>
<a name="line-405"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"Tue"</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Tuesday</span>
<a name="line-406"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Wed"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Wednesday</span>
<a name="line-407"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Thu"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Thursday</span>
<a name="line-408"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Fri"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Friday</span>
<a name="line-409"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"Sat"</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Saturday</span>
<a name="line-410"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Sun"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Sunday</span>
<a name="line-411"></a> <span class='hs-keyglyph'>]</span>
<a name="line-412"></a>
<a name="line-413"></a><a name="year"></a><span class='hs-comment'>-- | Four-digit year</span>
<a name="line-414"></a><span class='hs-definition'>year</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span>
<a name="line-415"></a><span class='hs-definition'>year</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>four_digits</span>
<a name="line-416"></a>
<a name="line-417"></a><a name="month_num"></a><span class='hs-comment'>-- | One or two digit month (e.g. 3 for March, 11 for November)</span>
<a name="line-418"></a><span class='hs-definition'>month_num</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Month</span>
<a name="line-419"></a><span class='hs-definition'>month_num</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>mn</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>manyNtoM</span> <span class='hs-num'>1</span> <span class='hs-num'>2</span> <span class='hs-varid'>digit</span>
<a name="line-420"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>intToMonth</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varid'>read</span> <span class='hs-varid'>mn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-421"></a>
<a name="line-422"></a><a name="intToMonth"></a><span class='hs-comment'>-- | January is 1, February is 2, etc</span>
<a name="line-423"></a><span class='hs-definition'>intToMonth</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Month</span>
<a name="line-424"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>January</span>
<a name="line-425"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>2</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>February</span>
<a name="line-426"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>3</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>March</span>
<a name="line-427"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>4</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>April</span>
<a name="line-428"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>5</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>May</span>
<a name="line-429"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>6</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>June</span>
<a name="line-430"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>7</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>July</span>
<a name="line-431"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>8</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>August</span>
<a name="line-432"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>9</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>September</span>
<a name="line-433"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>10</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>October</span>
<a name="line-434"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>11</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>November</span>
<a name="line-435"></a><span class='hs-definition'>intToMonth</span> <span class='hs-num'>12</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>December</span>
<a name="line-436"></a><span class='hs-definition'>intToMonth</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"invalid month!"</span>
<a name="line-437"></a>
<a name="line-438"></a><a name="month_name"></a><span class='hs-comment'>-- | English three-letter month abbreviations (e.g. Jan, Feb, Mar)</span>
<a name="line-439"></a><span class='hs-definition'>month_name</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Month</span>
<a name="line-440"></a><span class='hs-definition'>month_name</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>choice</span>
<a name="line-441"></a> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"Jan"</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>January</span>
<a name="line-442"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Feb"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>February</span>
<a name="line-443"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"Mar"</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>March</span>
<a name="line-444"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"Apr"</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>April</span>
<a name="line-445"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"May"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>May</span>
<a name="line-446"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"Jun"</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>June</span>
<a name="line-447"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Jul"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>July</span>
<a name="line-448"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Aug"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>August</span>
<a name="line-449"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Sep"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>September</span>
<a name="line-450"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Oct"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>October</span>
<a name="line-451"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Nov"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>November</span>
<a name="line-452"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"Dec"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>December</span>
<a name="line-453"></a> <span class='hs-keyglyph'>]</span>
<a name="line-454"></a>
<a name="line-455"></a><a name="day"></a><span class='hs-comment'>-- | day in one or two digit notation</span>
<a name="line-456"></a><span class='hs-definition'>day</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span>
<a name="line-457"></a><span class='hs-definition'>day</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>manyNtoM</span> <span class='hs-num'>1</span> <span class='hs-num'>2</span> <span class='hs-varid'>digit</span>
<a name="line-458"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>read</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-459"></a>
<a name="line-460"></a><a name="hour"></a><span class='hs-comment'>-- | hour in two-digit notation</span>
<a name="line-461"></a><span class='hs-definition'>hour</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span>
<a name="line-462"></a><span class='hs-definition'>hour</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>two_digits</span>
<a name="line-463"></a>
<a name="line-464"></a><a name="minute"></a><span class='hs-comment'>-- | minute in two-digit notation</span>
<a name="line-465"></a><span class='hs-definition'>minute</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span>
<a name="line-466"></a><span class='hs-definition'>minute</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>two_digits</span>
<a name="line-467"></a>
<a name="line-468"></a><a name="second"></a><span class='hs-comment'>-- | second in two-digit notation</span>
<a name="line-469"></a><span class='hs-definition'>second</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span>
<a name="line-470"></a><span class='hs-definition'>second</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>two_digits</span>
<a name="line-471"></a>
<a name="line-472"></a><a name="zone"></a><span class='hs-comment'>-- | limited timezone support</span>
<a name="line-473"></a><span class='hs-comment'>--</span>
<a name="line-474"></a><span class='hs-comment'>-- * +HHMM or -HHMM</span>
<a name="line-475"></a><span class='hs-comment'>--</span>
<a name="line-476"></a><span class='hs-comment'>-- * Universal timezones: UTC, UT</span>
<a name="line-477"></a><span class='hs-comment'>--</span>
<a name="line-478"></a><span class='hs-comment'>-- * Zones from GNU coreutils/lib/getdate.y, less half-hour ones --</span>
<a name="line-479"></a><span class='hs-comment'>-- sorry Newfies.</span>
<a name="line-480"></a><span class='hs-comment'>--</span>
<a name="line-481"></a><span class='hs-comment'>-- * any sequence of alphabetic characters (WARNING! treated as 0!)</span>
<a name="line-482"></a><span class='hs-definition'>zone</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span>
<a name="line-483"></a><span class='hs-definition'>zone</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>choice</span>
<a name="line-484"></a> <span class='hs-keyglyph'>[</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'+'</span><span class='hs-layout'>;</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>hour</span><span class='hs-layout'>;</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>minute</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-varop'>*</span><span class='hs-num'>60</span><span class='hs-layout'>)</span><span class='hs-varop'>+</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-varop'>*</span><span class='hs-num'>60</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-485"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'-'</span><span class='hs-layout'>;</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>hour</span><span class='hs-layout'>;</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>minute</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-varop'>*</span><span class='hs-num'>60</span><span class='hs-layout'>)</span><span class='hs-varop'>+</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-varop'>*</span><span class='hs-num'>60</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-486"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"UTC"</span> <span class='hs-num'>0</span>
<a name="line-487"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"UT"</span> <span class='hs-num'>0</span>
<a name="line-488"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"GMT"</span> <span class='hs-num'>0</span>
<a name="line-489"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"WET"</span> <span class='hs-num'>0</span>
<a name="line-490"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"WEST"</span> <span class='hs-num'>1</span>
<a name="line-491"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"BST"</span> <span class='hs-num'>1</span>
<a name="line-492"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"ART"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>3</span><span class='hs-layout'>)</span>
<a name="line-493"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"BRT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>3</span><span class='hs-layout'>)</span>
<a name="line-494"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"BRST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-495"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"AST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>4</span><span class='hs-layout'>)</span>
<a name="line-496"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"ADT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>3</span><span class='hs-layout'>)</span>
<a name="line-497"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"CLT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>4</span><span class='hs-layout'>)</span>
<a name="line-498"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"CLST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>3</span><span class='hs-layout'>)</span>
<a name="line-499"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"EST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>5</span><span class='hs-layout'>)</span>
<a name="line-500"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"EDT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>4</span><span class='hs-layout'>)</span>
<a name="line-501"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"CST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>6</span><span class='hs-layout'>)</span>
<a name="line-502"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"CDT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>5</span><span class='hs-layout'>)</span>
<a name="line-503"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"MST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>7</span><span class='hs-layout'>)</span>
<a name="line-504"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"MDT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>6</span><span class='hs-layout'>)</span>
<a name="line-505"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"PST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>8</span><span class='hs-layout'>)</span>
<a name="line-506"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"PDT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>7</span><span class='hs-layout'>)</span>
<a name="line-507"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"AKST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>9</span><span class='hs-layout'>)</span>
<a name="line-508"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"AKDT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>8</span><span class='hs-layout'>)</span>
<a name="line-509"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"HST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>10</span><span class='hs-layout'>)</span>
<a name="line-510"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"HAST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>10</span><span class='hs-layout'>)</span>
<a name="line-511"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"HADT"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>9</span><span class='hs-layout'>)</span>
<a name="line-512"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"SST"</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>12</span><span class='hs-layout'>)</span>
<a name="line-513"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"WAT"</span> <span class='hs-num'>1</span>
<a name="line-514"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"CET"</span> <span class='hs-num'>1</span>
<a name="line-515"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"CEST"</span> <span class='hs-num'>2</span>
<a name="line-516"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"MET"</span> <span class='hs-num'>1</span>
<a name="line-517"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"MEZ"</span> <span class='hs-num'>1</span>
<a name="line-518"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"MEST"</span> <span class='hs-num'>2</span>
<a name="line-519"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"MESZ"</span> <span class='hs-num'>2</span>
<a name="line-520"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"EET"</span> <span class='hs-num'>2</span>
<a name="line-521"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"EEST"</span> <span class='hs-num'>3</span>
<a name="line-522"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"CAT"</span> <span class='hs-num'>2</span>
<a name="line-523"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"SAST"</span> <span class='hs-num'>2</span>
<a name="line-524"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"EAT"</span> <span class='hs-num'>3</span>
<a name="line-525"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"MSK"</span> <span class='hs-num'>3</span>
<a name="line-526"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"MSD"</span> <span class='hs-num'>4</span>
<a name="line-527"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"SGT"</span> <span class='hs-num'>8</span>
<a name="line-528"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"KST"</span> <span class='hs-num'>9</span>
<a name="line-529"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"JST"</span> <span class='hs-num'>9</span>
<a name="line-530"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"GST"</span> <span class='hs-num'>10</span>
<a name="line-531"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"NZST"</span> <span class='hs-num'>12</span>
<a name="line-532"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkZone</span> <span class='hs-str'>"NZDT"</span> <span class='hs-num'>13</span>
<a name="line-533"></a> <span class='hs-comment'>-- if we don't understand it, just give a GMT answer...</span>
<a name="line-534"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>manyTill</span> <span class='hs-layout'>(</span><span class='hs-varid'>oneOf</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'a'</span><span class='hs-keyglyph'>..</span><span class='hs-chr'>'z'</span><span class='hs-keyglyph'>]</span><span class='hs-varop'>++</span><span class='hs-keyglyph'>[</span><span class='hs-chr'>'A'</span><span class='hs-keyglyph'>..</span><span class='hs-chr'>'Z'</span><span class='hs-keyglyph'>]</span><span class='hs-varop'>++</span><span class='hs-keyglyph'>[</span><span class='hs-chr'>' '</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-535"></a> <span class='hs-layout'>(</span><span class='hs-varid'>lookAhead</span> <span class='hs-varid'>space_digit</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span>
<a name="line-536"></a> <span class='hs-varid'>return</span> <span class='hs-num'>0</span> <span class='hs-layout'>}</span>
<a name="line-537"></a> <span class='hs-keyglyph'>]</span>
<a name="line-538"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>mkZone</span> <span class='hs-varid'>n</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>caseString</span> <span class='hs-varid'>n</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>o</span><span class='hs-varop'>*</span><span class='hs-num'>60</span><span class='hs-varop'>*</span><span class='hs-num'>60</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-539"></a> <span class='hs-varid'>space_digit</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>char</span> <span class='hs-chr'>' '</span><span class='hs-layout'>;</span> <span class='hs-varid'>oneOf</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'0'</span><span class='hs-keyglyph'>..</span><span class='hs-chr'>'9'</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>}</span>
<a name="line-540"></a>
<a name="line-541"></a><span class='hs-comment'>----- English dates and intervals -----------------------------------------------</span>
<a name="line-542"></a>
<a name="line-543"></a><a name="englishDateTime"></a><span class='hs-comment'>-- | In English, either a date followed by a time, or vice-versa, e.g,</span>
<a name="line-544"></a><span class='hs-comment'>--</span>
<a name="line-545"></a><span class='hs-comment'>-- * yesterday at noon</span>
<a name="line-546"></a><span class='hs-comment'>--</span>
<a name="line-547"></a><span class='hs-comment'>-- * yesterday tea time</span>
<a name="line-548"></a><span class='hs-comment'>--</span>
<a name="line-549"></a><span class='hs-comment'>-- * 12:00 yesterday</span>
<a name="line-550"></a><span class='hs-comment'>--</span>
<a name="line-551"></a><span class='hs-comment'>-- See 'englishDate' and 'englishTime'</span>
<a name="line-552"></a><span class='hs-comment'>-- Uses its first argument as "now", i.e. the time relative to which</span>
<a name="line-553"></a><span class='hs-comment'>-- "yesterday", "today" etc are to be interpreted</span>
<a name="line-554"></a><span class='hs-definition'>englishDateTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>CalendarTime</span>
<a name="line-555"></a><span class='hs-definition'>englishDateTime</span> <span class='hs-varid'>now</span> <span class='hs-keyglyph'>=</span>
<a name="line-556"></a> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>dateMaybeAtTime</span> <span class='hs-varop'><|></span> <span class='hs-varid'>timeThenDate</span>
<a name="line-557"></a> <span class='hs-keyword'>where</span>
<a name="line-558"></a> <span class='hs-comment'>-- yesterday (at) noon</span>
<a name="line-559"></a> <span class='hs-varid'>dateMaybeAtTime</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-560"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>ed</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDate</span> <span class='hs-varid'>now</span>
<a name="line-561"></a> <span class='hs-varid'>t</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-conid'>Nothing</span> <span class='hs-varop'>$</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-562"></a> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>space</span><span class='hs-layout'>;</span> <span class='hs-varid'>optional</span> <span class='hs-varop'>$</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"at "</span><span class='hs-layout'>;</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>englishTime</span> <span class='hs-layout'>}</span>
<a name="line-563"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-varid'>id</span> <span class='hs-varid'>t</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ed</span>
<a name="line-564"></a> <span class='hs-comment'>-- tea time 2005-12-04</span>
<a name="line-565"></a> <span class='hs-varid'>timeThenDate</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-566"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishTime</span>
<a name="line-567"></a> <span class='hs-varid'>optional</span> <span class='hs-varop'>$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>','</span>
<a name="line-568"></a> <span class='hs-varid'>space</span>
<a name="line-569"></a> <span class='hs-varid'>ed</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDate</span> <span class='hs-varid'>now</span>
<a name="line-570"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>t</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unsetTime</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ed</span>
<a name="line-571"></a>
<a name="line-572"></a><a name="englishDate"></a><span class='hs-comment'>-- | Specific dates in English as specific points of time, e.g,</span>
<a name="line-573"></a><span class='hs-comment'>--</span>
<a name="line-574"></a><span class='hs-comment'>-- * today</span>
<a name="line-575"></a><span class='hs-comment'>--</span>
<a name="line-576"></a><span class='hs-comment'>-- * yesterday</span>
<a name="line-577"></a><span class='hs-comment'>--</span>
<a name="line-578"></a><span class='hs-comment'>-- * last week (i.e. the beginning of that interval)</span>
<a name="line-579"></a><span class='hs-comment'>--</span>
<a name="line-580"></a><span class='hs-comment'>-- * 4 months ago (via 'englishAgo')</span>
<a name="line-581"></a><span class='hs-comment'>--</span>
<a name="line-582"></a><span class='hs-comment'>-- The first argument is "now".</span>
<a name="line-583"></a><span class='hs-definition'>englishDate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>CalendarTime</span>
<a name="line-584"></a><span class='hs-definition'>englishDate</span> <span class='hs-varid'>now</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-585"></a> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"today"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>resetCalendar</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-586"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"yesterday"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>oneDay</span> <span class='hs-varop'>`subtractFromCal`</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-587"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>fst</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>englishLast</span> <span class='hs-varid'>now</span>
<a name="line-588"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>englishAgo</span> <span class='hs-varid'>now</span>
<a name="line-589"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>oneDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>1</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-590"></a>
<a name="line-591"></a><a name="englishAgo"></a><span class='hs-comment'>-- | English expressions for points in the past, e.g.</span>
<a name="line-592"></a><span class='hs-comment'>--</span>
<a name="line-593"></a><span class='hs-comment'>-- * 4 months ago</span>
<a name="line-594"></a><span class='hs-comment'>--</span>
<a name="line-595"></a><span class='hs-comment'>-- * 1 day ago</span>
<a name="line-596"></a><span class='hs-comment'>--</span>
<a name="line-597"></a><span class='hs-comment'>-- * day before yesterday</span>
<a name="line-598"></a><span class='hs-comment'>--</span>
<a name="line-599"></a><span class='hs-comment'>-- See 'englishDuration'</span>
<a name="line-600"></a><span class='hs-definition'>englishAgo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>CalendarTime</span>
<a name="line-601"></a><span class='hs-definition'>englishAgo</span> <span class='hs-varid'>now</span> <span class='hs-keyglyph'>=</span>
<a name="line-602"></a> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDuration</span>
<a name="line-603"></a> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>space</span>
<a name="line-604"></a> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-layout'>,</span><span class='hs-varid'>ref</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"ago"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-605"></a> <span class='hs-varop'><|></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>beforeMod</span> <span class='hs-varop'><|></span> <span class='hs-varid'>afterMod</span>
<a name="line-606"></a> <span class='hs-varid'>space</span>
<a name="line-607"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDate</span> <span class='hs-varid'>now</span>
<a name="line-608"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>fst</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>englishLast</span> <span class='hs-varid'>now</span>
<a name="line-609"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>iso8601_date_time</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctTZ</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span>
<a name="line-610"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-611"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>multiplyDiff</span> <span class='hs-varid'>m</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`addToCal`</span> <span class='hs-varid'>ref</span>
<a name="line-612"></a> <span class='hs-keyword'>where</span>
<a name="line-613"></a> <span class='hs-varid'>beforeMod</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"before"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-614"></a> <span class='hs-varid'>afterMod</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"after"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-num'>1</span>
<a name="line-615"></a>
<a name="line-616"></a><a name="englishInterval"></a><span class='hs-comment'>-- | English expressions for intervals of time,</span>
<a name="line-617"></a><span class='hs-comment'>--</span>
<a name="line-618"></a><span class='hs-comment'>-- * before tea time (i.e. from the beginning of time)</span>
<a name="line-619"></a><span class='hs-comment'>--</span>
<a name="line-620"></a><span class='hs-comment'>-- * after 14:00 last month (i.e. till now)</span>
<a name="line-621"></a><span class='hs-comment'>--</span>
<a name="line-622"></a><span class='hs-comment'>-- * between last year and last month</span>
<a name="line-623"></a><span class='hs-comment'>--</span>
<a name="line-624"></a><span class='hs-comment'>-- * in the last three months (i.e. from then till now)</span>
<a name="line-625"></a><span class='hs-comment'>--</span>
<a name="line-626"></a><span class='hs-comment'>-- * 4 months ago (i.e. till now; see 'englishAgo')</span>
<a name="line-627"></a><span class='hs-definition'>englishInterval</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>TimeInterval</span>
<a name="line-628"></a><span class='hs-definition'>englishInterval</span> <span class='hs-varid'>now</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>twixt</span> <span class='hs-varop'><|></span> <span class='hs-varid'>before</span> <span class='hs-varop'><|></span> <span class='hs-varid'>after</span> <span class='hs-varop'><|></span> <span class='hs-varid'>inTheLast</span> <span class='hs-varop'><|></span> <span class='hs-varid'>lastetc</span>
<a name="line-629"></a> <span class='hs-keyword'>where</span>
<a name="line-630"></a> <span class='hs-varid'>englishDT</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>iso8601_date_time</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctTZ</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span>
<a name="line-631"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>englishDateTime</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span>
<a name="line-632"></a> <span class='hs-varid'>before</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-633"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"before"</span>
<a name="line-634"></a> <span class='hs-varid'>space</span>
<a name="line-635"></a> <span class='hs-varid'>end</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDT</span>
<a name="line-636"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>theBeginning</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>end</span><span class='hs-layout'>)</span>
<a name="line-637"></a> <span class='hs-varid'>after</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-638"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"after"</span>
<a name="line-639"></a> <span class='hs-varid'>space</span>
<a name="line-640"></a> <span class='hs-varid'>start</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDT</span>
<a name="line-641"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>start</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-642"></a> <span class='hs-varid'>twixt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-643"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"between"</span>
<a name="line-644"></a> <span class='hs-varid'>space</span>
<a name="line-645"></a> <span class='hs-varid'>start</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDT</span>
<a name="line-646"></a> <span class='hs-varid'>space</span>
<a name="line-647"></a> <span class='hs-varid'>caseString</span> <span class='hs-str'>"and"</span>
<a name="line-648"></a> <span class='hs-varid'>space</span>
<a name="line-649"></a> <span class='hs-varid'>end</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDT</span>
<a name="line-650"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>start</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>end</span><span class='hs-layout'>)</span>
<a name="line-651"></a> <span class='hs-varid'>inTheLast</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-652"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"in the last"</span>
<a name="line-653"></a> <span class='hs-varid'>space</span>
<a name="line-654"></a> <span class='hs-varid'>dur</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDuration</span>
<a name="line-655"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>dur</span> <span class='hs-varop'>`subtractFromCal`</span> <span class='hs-varid'>now</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span>
<a name="line-656"></a> <span class='hs-varid'>lastetc</span> <span class='hs-keyglyph'>=</span>
<a name="line-657"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishAgo</span> <span class='hs-varid'>now</span>
<a name="line-658"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>l</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span>
<a name="line-659"></a>
<a name="line-660"></a><a name="englishLast"></a><span class='hs-comment'>-- | Durations in English that begin with the word \"last\",</span>
<a name="line-661"></a><span class='hs-comment'>-- E.g. \"last 4 months\" is treated as the duration between</span>
<a name="line-662"></a><span class='hs-comment'>-- 4 months ago and now</span>
<a name="line-663"></a><span class='hs-definition'>englishLast</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>CalendarTime</span><span class='hs-layout'>,</span> <span class='hs-conid'>CalendarTime</span><span class='hs-layout'>)</span>
<a name="line-664"></a><span class='hs-definition'>englishLast</span> <span class='hs-varid'>now</span> <span class='hs-keyglyph'>=</span>
<a name="line-665"></a> <span class='hs-comment'>-- last year, last week, last 3 years, etc</span>
<a name="line-666"></a> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"last"</span>
<a name="line-667"></a> <span class='hs-varid'>space</span>
<a name="line-668"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>englishDuration</span>
<a name="line-669"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>`subtractFromCal`</span> <span class='hs-varid'>now</span><span class='hs-layout'>,</span> <span class='hs-varid'>now</span><span class='hs-layout'>)</span>
<a name="line-670"></a>
<a name="line-671"></a><a name="englishTime"></a><span class='hs-comment'>-- | Either an 'iso8601_time' or one of several common</span>
<a name="line-672"></a><span class='hs-comment'>-- English time expressions like 'noon' or 'tea time'</span>
<a name="line-673"></a><span class='hs-definition'>englishTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>CalendarTime</span><span class='hs-keyglyph'>-></span><span class='hs-conid'>CalendarTime</span><span class='hs-layout'>)</span>
<a name="line-674"></a><span class='hs-definition'>englishTime</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-675"></a> <span class='hs-varid'>choice</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>wrapM</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>iso8601_time</span>
<a name="line-676"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>namedTime</span> <span class='hs-str'>"noon"</span> <span class='hs-num'>12</span> <span class='hs-num'>0</span>
<a name="line-677"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>namedTime</span> <span class='hs-str'>"midnight"</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-678"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>namedTime</span> <span class='hs-str'>"tea time"</span> <span class='hs-num'>16</span> <span class='hs-num'>30</span>
<a name="line-679"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>namedTime</span> <span class='hs-str'>"bed time"</span> <span class='hs-num'>2</span> <span class='hs-num'>30</span>
<a name="line-680"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>namedTime</span> <span class='hs-str'>"proper bed time"</span> <span class='hs-num'>21</span> <span class='hs-num'>30</span> <span class='hs-keyglyph'>]</span>
<a name="line-681"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>namedTime</span> <span class='hs-varid'>name</span> <span class='hs-varid'>h</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-682"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>caseString</span> <span class='hs-varid'>name</span>
<a name="line-683"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span> <span class='hs-layout'>{</span> <span class='hs-varid'>ctHour</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>h</span><span class='hs-layout'>,</span> <span class='hs-varid'>ctMin</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>m</span> <span class='hs-layout'>}</span>
<a name="line-684"></a> <span class='hs-varid'>wrapM</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toMCalendarTime</span>
<a name="line-685"></a>
<a name="line-686"></a><a name="englishDuration"></a><span class='hs-comment'>-- | Some English durations, e.g.</span>
<a name="line-687"></a><span class='hs-comment'>--</span>
<a name="line-688"></a><span class='hs-comment'>-- * day</span>
<a name="line-689"></a><span class='hs-comment'>--</span>
<a name="line-690"></a><span class='hs-comment'>-- * 4 score</span>
<a name="line-691"></a><span class='hs-comment'>--</span>
<a name="line-692"></a><span class='hs-comment'>-- * 7 years</span>
<a name="line-693"></a><span class='hs-comment'>--</span>
<a name="line-694"></a><span class='hs-comment'>-- * 12 months</span>
<a name="line-695"></a><span class='hs-comment'>--</span>
<a name="line-696"></a><span class='hs-comment'>-- This is not particularly strict about what it accepts.</span>
<a name="line-697"></a><span class='hs-comment'>-- For example, "7 yeares", "4 scores" or "1 days" are</span>
<a name="line-698"></a><span class='hs-comment'>-- just fine.</span>
<a name="line-699"></a><span class='hs-definition'>englishDuration</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-varid'>a</span> <span class='hs-conid'>TimeDiff</span>
<a name="line-700"></a><span class='hs-definition'>englishDuration</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span>
<a name="line-701"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-num'>1</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many1</span> <span class='hs-varid'>digit</span><span class='hs-layout'>;</span> <span class='hs-varid'>space</span><span class='hs-layout'>;</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>read</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-702"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>base</span>
<a name="line-703"></a> <span class='hs-varid'>optional</span> <span class='hs-layout'>(</span><span class='hs-varid'>caseString</span> <span class='hs-str'>"es"</span> <span class='hs-varop'><|></span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"s"</span><span class='hs-layout'>)</span>
<a name="line-704"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>current</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multiplyDiff</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span>
<a name="line-705"></a> <span class='hs-varid'>next</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-varid'>noTimeDiff</span> <span class='hs-varop'>$</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-706"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>optional</span> <span class='hs-varid'>space</span><span class='hs-layout'>;</span> <span class='hs-varid'>char</span> <span class='hs-chr'>','</span> <span class='hs-layout'>;</span> <span class='hs-varid'>optional</span> <span class='hs-varid'>space</span> <span class='hs-layout'>;</span> <span class='hs-varid'>englishDuration</span> <span class='hs-layout'>}</span>
<a name="line-707"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>addDiff</span> <span class='hs-varid'>current</span> <span class='hs-varid'>next</span>
<a name="line-708"></a> <span class='hs-keyword'>where</span>
<a name="line-709"></a> <span class='hs-varid'>base</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>choice</span>
<a name="line-710"></a> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"score"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>20</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- why not?</span>
<a name="line-711"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"year"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>1</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-712"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"month"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>0</span> <span class='hs-num'>1</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-713"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"fortnight"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>14</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-714"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"week"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>7</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-715"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"day"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>1</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-716"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"hour"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>1</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-717"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"minute"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>1</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-718"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>caseString</span> <span class='hs-str'>"second"</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>1</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>]</span>
<a name="line-719"></a>
<a name="line-720"></a><span class='hs-comment'>----- Calendar and TimeDiff manipulation ---------------------------------------------</span>
<a name="line-721"></a>
<a name="line-722"></a><a name="theBeginning"></a><span class='hs-comment'>-- | The very beginning of time, i.e. 1970-01-01</span>
<a name="line-723"></a><span class='hs-definition'>theBeginning</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span>
<a name="line-724"></a><span class='hs-definition'>theBeginning</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toCalendarTime</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TOD</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-725"></a>
<a name="line-726"></a><a name="MCalendarTime"></a><span class='hs-comment'>-- | An 'MCalenderTime' is an underspecified 'CalendarTime'</span>
<a name="line-727"></a><a name="MCalendarTime"></a><span class='hs-comment'>-- It is used for parsing dates. For example, if you want to parse</span>
<a name="line-728"></a><a name="MCalendarTime"></a><span class='hs-comment'>-- the date '4 January', it may be useful to underspecify the year</span>
<a name="line-729"></a><a name="MCalendarTime"></a><span class='hs-comment'>-- by setting it to 'Nothing'. This uses almost the same fields as</span>
<a name="line-730"></a><a name="MCalendarTime"></a><span class='hs-comment'>-- 'System.Time.CalendarTime', a notable exception being that we</span>
<a name="line-731"></a><a name="MCalendarTime"></a><span class='hs-comment'>-- introduce 'mctWeek' to indicate if a weekday was specified or not</span>
<a name="line-732"></a><a name="MCalendarTime"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-733"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>mctYear</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-734"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctMonth</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Month</span>
<a name="line-735"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctDay</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-736"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctHour</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-737"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctMin</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-738"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctSec</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-739"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctPicosec</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Integer</span>
<a name="line-740"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctWDay</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Day</span>
<a name="line-741"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctYDay</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-742"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctTZName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span>
<a name="line-743"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctTZ</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-744"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctIsDST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Bool</span>
<a name="line-745"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctWeek</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- is set or not</span>
<a name="line-746"></a><span class='hs-layout'>}</span> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Show</span>
<a name="line-747"></a>
<a name="line-748"></a><a name="toMCalendarTime"></a><span class='hs-comment'>-- | Trivially convert a 'CalendarTime' to a fully specified</span>
<a name="line-749"></a><span class='hs-comment'>-- 'MCalendarTime' (note that this sets the 'mctWeek' flag to</span>
<a name="line-750"></a><span class='hs-comment'>-- @False@</span>
<a name="line-751"></a><span class='hs-definition'>toMCalendarTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-752"></a><span class='hs-definition'>toMCalendarTime</span> <span class='hs-layout'>(</span><span class='hs-conid'>CalendarTime</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-varid'>e</span> <span class='hs-varid'>f</span> <span class='hs-varid'>g</span> <span class='hs-varid'>h</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span> <span class='hs-varid'>k</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-753"></a> <span class='hs-conid'>MCalendarTime</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-754"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-755"></a> <span class='hs-conid'>False</span>
<a name="line-756"></a>
<a name="line-757"></a><a name="unsafeToCalendarTime"></a><span class='hs-comment'>-- | Returns the first 'CalendarTime' that falls within a 'MCalendarTime'</span>
<a name="line-758"></a><span class='hs-comment'>-- This is only unsafe in the sense that it plugs in default values</span>
<a name="line-759"></a><span class='hs-comment'>-- for fields that have not been set, e.g. @January@ for the month</span>
<a name="line-760"></a><span class='hs-comment'>-- or @0@ for the seconds field.</span>
<a name="line-761"></a><span class='hs-comment'>-- Maybe we should rename it something happier.</span>
<a name="line-762"></a><span class='hs-comment'>-- See also 'resetCalendar'</span>
<a name="line-763"></a><span class='hs-definition'>unsafeToCalendarTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span>
<a name="line-764"></a><span class='hs-definition'>unsafeToCalendarTime</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-765"></a> <span class='hs-conid'>CalendarTime</span>
<a name="line-766"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>ctYear</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctYear</span> <span class='hs-varid'>m</span>
<a name="line-767"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctMonth</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-conid'>January</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctMonth</span> <span class='hs-varid'>m</span>
<a name="line-768"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctDay</span> <span class='hs-varid'>m</span>
<a name="line-769"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctHour</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctHour</span> <span class='hs-varid'>m</span>
<a name="line-770"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctMin</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctMin</span> <span class='hs-varid'>m</span>
<a name="line-771"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctSec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctSec</span> <span class='hs-varid'>m</span>
<a name="line-772"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctPicosec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctPicosec</span> <span class='hs-varid'>m</span>
<a name="line-773"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctWDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-conid'>Sunday</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctWDay</span> <span class='hs-varid'>m</span>
<a name="line-774"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctYDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctYDay</span> <span class='hs-varid'>m</span>
<a name="line-775"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctTZName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-str'>""</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctTZName</span> <span class='hs-varid'>m</span>
<a name="line-776"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctTZ</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctTZ</span> <span class='hs-varid'>m</span>
<a name="line-777"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctIsDST</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-conid'>False</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mctIsDST</span> <span class='hs-varid'>m</span>
<a name="line-778"></a> <span class='hs-layout'>}</span>
<a name="line-779"></a>
<a name="line-780"></a><a name="addToCal"></a><span class='hs-definition'>addToCal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span>
<a name="line-781"></a><span class='hs-definition'>addToCal</span> <span class='hs-varid'>td</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toUTCTime</span> <span class='hs-varop'>.</span> <span class='hs-varid'>addToClockTime</span> <span class='hs-varid'>td</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toClockTime</span>
<a name="line-782"></a>
<a name="line-783"></a><a name="subtractFromCal"></a><span class='hs-definition'>subtractFromCal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span>
<a name="line-784"></a><span class='hs-definition'>subtractFromCal</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addToCal</span> <span class='hs-varop'>.</span> <span class='hs-varid'>multiplyDiff</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-785"></a>
<a name="line-786"></a><a name="addToMCal"></a><span class='hs-definition'>addToMCal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-787"></a><span class='hs-definition'>addToMCal</span> <span class='hs-varid'>td</span> <span class='hs-varid'>mc</span> <span class='hs-keyglyph'>=</span>
<a name="line-788"></a> <span class='hs-varid'>copyCalendar</span> <span class='hs-layout'>(</span><span class='hs-varid'>addToCal</span> <span class='hs-varid'>td</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varid'>mc</span><span class='hs-layout'>)</span> <span class='hs-varid'>mc</span>
<a name="line-789"></a>
<a name="line-790"></a><a name="subtractFromMCal"></a><span class='hs-definition'>subtractFromMCal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-791"></a><span class='hs-definition'>subtractFromMCal</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addToMCal</span> <span class='hs-varop'>.</span> <span class='hs-varid'>multiplyDiff</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-792"></a>
<a name="line-793"></a><a name="addDiff"></a><span class='hs-comment'>-- surely there is a more concise way to express these</span>
<a name="line-794"></a><span class='hs-definition'>addDiff</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TimeDiff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TimeDiff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TimeDiff</span>
<a name="line-795"></a><span class='hs-definition'>addDiff</span> <span class='hs-layout'>(</span><span class='hs-conid'>TimeDiff</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>a3</span> <span class='hs-varid'>a4</span> <span class='hs-varid'>a5</span> <span class='hs-varid'>a6</span> <span class='hs-varid'>a7</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>TimeDiff</span> <span class='hs-varid'>b1</span> <span class='hs-varid'>b2</span> <span class='hs-varid'>b3</span> <span class='hs-varid'>b4</span> <span class='hs-varid'>b5</span> <span class='hs-varid'>b6</span> <span class='hs-varid'>b7</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-796"></a> <span class='hs-conid'>TimeDiff</span> <span class='hs-layout'>(</span><span class='hs-varid'>a1</span><span class='hs-varop'>+</span><span class='hs-varid'>b1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a2</span><span class='hs-varop'>+</span><span class='hs-varid'>b2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a3</span><span class='hs-varop'>+</span><span class='hs-varid'>b3</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a4</span><span class='hs-varop'>+</span><span class='hs-varid'>b4</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a5</span><span class='hs-varop'>+</span><span class='hs-varid'>b5</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a6</span><span class='hs-varop'>+</span><span class='hs-varid'>b6</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a7</span> <span class='hs-varop'>+</span> <span class='hs-varid'>b7</span><span class='hs-layout'>)</span>
<a name="line-797"></a>
<a name="line-798"></a><a name="multiplyDiff"></a><span class='hs-comment'>-- | 'multiplyDiff' @i d@ multiplies every field in @d@ with @i@</span>
<a name="line-799"></a><span class='hs-comment'>--</span>
<a name="line-800"></a><span class='hs-comment'>-- FIXME; this seems like a terrible idea! it seems like</span>
<a name="line-801"></a><span class='hs-comment'>-- we should get rid of it if at all possible, maybe adding an</span>
<a name="line-802"></a><span class='hs-comment'>-- invertDiff function</span>
<a name="line-803"></a><span class='hs-definition'>multiplyDiff</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TimeDiff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TimeDiff</span>
<a name="line-804"></a><span class='hs-definition'>multiplyDiff</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>TimeDiff</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>a3</span> <span class='hs-varid'>a4</span> <span class='hs-varid'>a5</span> <span class='hs-varid'>a6</span> <span class='hs-varid'>a7</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-805"></a> <span class='hs-conid'>TimeDiff</span> <span class='hs-layout'>(</span><span class='hs-varid'>a1</span><span class='hs-varop'>*</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a2</span><span class='hs-varop'>*</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a3</span><span class='hs-varop'>*</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a4</span><span class='hs-varop'>*</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a5</span><span class='hs-varop'>*</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a6</span><span class='hs-varop'>*</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a7</span> <span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-varid'>toInteger</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-806"></a>
<a name="line-807"></a><a name="nullMCalendar"></a><span class='hs-definition'>nullMCalendar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-808"></a><span class='hs-definition'>nullMCalendar</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span>
<a name="line-809"></a> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span>
<a name="line-810"></a> <span class='hs-conid'>False</span>
<a name="line-811"></a>
<a name="line-812"></a><a name="resetCalendar"></a><span class='hs-comment'>-- | Set a calendar to UTC time any eliminate any inconsistencies within</span>
<a name="line-813"></a><span class='hs-comment'>-- (for example, where the weekday is given as @Thursday@, but this does not</span>
<a name="line-814"></a><span class='hs-comment'>-- match what the numerical date would lead one to expect)</span>
<a name="line-815"></a><span class='hs-definition'>resetCalendar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span>
<a name="line-816"></a><span class='hs-definition'>resetCalendar</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toUTCTime</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toClockTime</span>
<a name="line-817"></a>
<a name="line-818"></a><a name="copyCalendar"></a><span class='hs-comment'>-- | 'copyCalendar' @c mc@ replaces any field which is</span>
<a name="line-819"></a><span class='hs-comment'>-- specified in @mc@ with the equivalent field in @c@</span>
<a name="line-820"></a><span class='hs-comment'>-- @copyCalendar c nullMCalendar == nullMCalendar@</span>
<a name="line-821"></a><span class='hs-definition'>copyCalendar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MCalendarTime</span>
<a name="line-822"></a><span class='hs-definition'>copyCalendar</span> <span class='hs-varid'>c</span> <span class='hs-varid'>mc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mc</span>
<a name="line-823"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>mctYear</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctYear</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctYear</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-824"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctMonth</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctMonth</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctMonth</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-825"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctDay</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctDay</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-826"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctHour</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctHour</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctHour</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-827"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctMin</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctMin</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctMin</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-828"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctSec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctSec</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctSec</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-829"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctPicosec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctPicosec</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctPicosec</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-830"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctWDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctWDay</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctWDay</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-831"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctYDay</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctYDay</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctYDay</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-832"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctTZName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctTZName</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctTZName</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-833"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctTZ</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctTZ</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctTZ</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-834"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mctIsDST</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mctIsDST</span> <span class='hs-varid'>mc</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctIsDST</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-835"></a> <span class='hs-layout'>}</span>
<a name="line-836"></a>
<a name="line-837"></a><a name="unsetTime"></a><span class='hs-comment'>-- | Zero the time fields of a 'CalendarTime'</span>
<a name="line-838"></a><span class='hs-definition'>unsetTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span>
<a name="line-839"></a><span class='hs-definition'>unsetTime</span> <span class='hs-varid'>mc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mc</span>
<a name="line-840"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>ctHour</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-841"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctMin</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-842"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctSec</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-843"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ctPicosec</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-844"></a> <span class='hs-layout'>}</span>
</pre></body>
</html>
