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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2004 David Roundy</span>
<a name="line-2"></a><span class='hs-comment'>--</span>
<a name="line-3"></a><span class='hs-comment'>-- This program is free software; you can redistribute it and/or modify</span>
<a name="line-4"></a><span class='hs-comment'>-- it under the terms of the GNU General Public License as published by</span>
<a name="line-5"></a><span class='hs-comment'>-- the Free Software Foundation; either version 2, or (at your option)</span>
<a name="line-6"></a><span class='hs-comment'>-- any later version.</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- This program is distributed in the hope that it will be useful,</span>
<a name="line-9"></a><span class='hs-comment'>-- but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="line-10"></a><span class='hs-comment'>-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="line-11"></a><span class='hs-comment'>-- GNU General Public License for more details.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- You should have received a copy of the GNU General Public License</span>
<a name="line-14"></a><span class='hs-comment'>-- along with this program; see the file COPYING. If not, write to</span>
<a name="line-15"></a><span class='hs-comment'>-- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="line-16"></a><span class='hs-comment'>-- Boston, MA 02110-1301, USA.</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-comment'>{-# LANGUAGE ExistentialQuantification #-}</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-comment'>-- |</span>
<a name="line-21"></a><span class='hs-comment'>-- Module : DateMatcher</span>
<a name="line-22"></a><span class='hs-comment'>-- Copyright : 2004 David Roundy</span>
<a name="line-23"></a><span class='hs-comment'>-- License : GPL</span>
<a name="line-24"></a><span class='hs-comment'>-- Maintainer : darcs-devel@darcs.net</span>
<a name="line-25"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-26"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>DateMatcher</span> <span class='hs-layout'>(</span>
<a name="line-29"></a> <span class='hs-varid'>parseDateMatcher</span>
<a name="line-30"></a> <span class='hs-comment'>-- for debugging only</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DateMatcher</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getMatchers</span>
<a name="line-33"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-34"></a>
<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'>Exception</span><span class='hs-varop'>.</span><span class='hs-conid'>Extensible</span> <span class='hs-layout'>(</span> <span class='hs-varid'>catch</span><span class='hs-layout'>,</span> <span class='hs-varid'>throw</span> <span class='hs-layout'>)</span>
<a name="line-36"></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'>isJust</span> <span class='hs-layout'>)</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span> <span class='hs-varid'>catch</span> <span class='hs-layout'>)</span>
<a name="line-38"></a>
<a name="line-39"></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'>Error</span> <span class='hs-layout'>(</span> <span class='hs-varid'>isUserError</span><span class='hs-layout'>,</span> <span class='hs-varid'>ioeGetErrorString</span> <span class='hs-layout'>)</span>
<a name="line-40"></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-41"></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> <span class='hs-layout'>(</span> <span class='hs-varid'>eof</span><span class='hs-layout'>,</span> <span class='hs-varid'>parse</span><span class='hs-layout'>,</span> <span class='hs-conid'>ParseError</span> <span class='hs-layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>IsoDate</span> <span class='hs-layout'>(</span> <span class='hs-varid'>parseDate</span><span class='hs-layout'>,</span> <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-44"></a> <span class='hs-varid'>iso8601Interval</span><span class='hs-layout'>,</span> <span class='hs-varid'>resetCalendar</span><span class='hs-layout'>,</span> <span class='hs-varid'>subtractFromMCal</span><span class='hs-layout'>,</span> <span class='hs-varid'>getLocalTz</span><span class='hs-layout'>,</span>
<a name="line-45"></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'>toMCalendarTime</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafeToCalendarTime</span><span class='hs-layout'>,</span>
<a name="line-46"></a> <span class='hs-varid'>unsetTime</span>
<a name="line-47"></a> <span class='hs-layout'>)</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="withinDay"></a><span class='hs-comment'>-- | 'withinDay' @x y@ is true if @x <= y < (x + one_day)@</span>
<a name="line-50"></a><span class='hs-comment'>-- Note that this converts the two dates to @ClockTime@ to avoid</span>
<a name="line-51"></a><span class='hs-comment'>-- any timezone-related errors</span>
<a name="line-52"></a><span class='hs-definition'>withinDay</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-53"></a><span class='hs-definition'>withinDay</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>within</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toClockTime</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>addToClockTime</span> <span class='hs-varid'>day</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toClockTime</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-55"></a> <span class='hs-layout'>(</span><span class='hs-varid'>toClockTime</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-keyword'>where</span>
<a name="line-57"></a> <span class='hs-varid'>day</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-58"></a>
<a name="line-59"></a><a name="dateRange"></a><span class='hs-comment'>-- | 'dateRange' @x1 x2 y@ is true if @x1 <= y < x2@</span>
<a name="line-60"></a><span class='hs-comment'>-- Since @x1@ and @x2@ can be underspecified, we simply assume the</span>
<a name="line-61"></a><span class='hs-comment'>-- first date that they could stand for.</span>
<a name="line-62"></a><span class='hs-definition'>dateRange</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-63"></a><span class='hs-definition'>dateRange</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cDateRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="cDateRange"></a><span class='hs-comment'>-- | 'cDateRange' @x1 x2 y@ is true if @x1 <= y < x2@</span>
<a name="line-67"></a><span class='hs-definition'>cDateRange</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-68"></a><span class='hs-definition'>cDateRange</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-varid'>within</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>toClockTime</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>toClockTime</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>toClockTime</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-70"></a>
<a name="line-71"></a><a name="within"></a><span class='hs-comment'>-- | 'within' @x1 x2 y@ is true if @x1 <= y < x2@</span>
<a name="line-72"></a><span class='hs-definition'>within</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>ClockTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>ClockTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ClockTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-73"></a><span class='hs-definition'>within</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-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>end</span><span class='hs-layout'>)</span> <span class='hs-varid'>time</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>start</span> <span class='hs-varop'><=</span> <span class='hs-varid'>time</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>time</span> <span class='hs-varop'><</span> <span class='hs-varid'>end</span>
<a name="line-74"></a><span class='hs-definition'>within</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>end</span><span class='hs-layout'>)</span> <span class='hs-varid'>time</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>time</span> <span class='hs-varop'><</span> <span class='hs-varid'>end</span>
<a name="line-75"></a><span class='hs-definition'>within</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-varid'>time</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>start</span> <span class='hs-varop'><=</span> <span class='hs-varid'>time</span>
<a name="line-76"></a><span class='hs-definition'>within</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-77"></a>
<a name="line-78"></a><a name="samePartialDate"></a><span class='hs-comment'>-- | 'samePartialDate' @range exact@ is true if @exact@ falls</span>
<a name="line-79"></a><span class='hs-comment'>-- within the a range of dates represented by @range@.</span>
<a name="line-80"></a><span class='hs-comment'>-- The purpose of this function is to support matching on partially</span>
<a name="line-81"></a><span class='hs-comment'>-- specified dates. That is, if you only specify the date 2007,</span>
<a name="line-82"></a><span class='hs-comment'>-- this function should match any dates within that year. On the</span>
<a name="line-83"></a><span class='hs-comment'>-- other hand, if you specify 2007-01, this function will match any</span>
<a name="line-84"></a><span class='hs-comment'>-- dates within that month. This function only matches up to the</span>
<a name="line-85"></a><span class='hs-comment'>-- second.</span>
<a name="line-86"></a><span class='hs-definition'>samePartialDate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MCalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-87"></a><span class='hs-definition'>samePartialDate</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b_</span> <span class='hs-keyglyph'>=</span>
<a name="line-88"></a> <span class='hs-varid'>within</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>clockA</span><span class='hs-layout'>)</span>
<a name="line-89"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>addToClockTime</span> <span class='hs-varid'>interval</span> <span class='hs-varid'>clockA</span><span class='hs-layout'>)</span>
<a name="line-90"></a> <span class='hs-layout'>(</span><span class='hs-varid'>toClockTime</span> <span class='hs-varid'>calB</span><span class='hs-layout'>)</span>
<a name="line-91"></a> <span class='hs-keyword'>where</span>
<a name="line-92"></a> <span class='hs-varid'>interval</span>
<a name="line-93"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>(</span><span class='hs-varid'>mctSec</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>second</span>
<a name="line-94"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>(</span><span class='hs-varid'>mctMin</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>minute</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>(</span><span class='hs-varid'>mctHour</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hour</span>
<a name="line-96"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>(</span><span class='hs-varid'>mctYDay</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>day</span>
<a name="line-97"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>mctWeek</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>week</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varid'>day</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>mctWDay</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-98"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>(</span><span class='hs-varid'>mctDay</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>day</span>
<a name="line-99"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>(</span><span class='hs-varid'>mctMonth</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>month</span>
<a name="line-100"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>year</span>
<a name="line-101"></a> <span class='hs-varid'>year</span> <span class='hs-keyglyph'>=</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>
<a name="line-102"></a> <span class='hs-varid'>month</span> <span class='hs-keyglyph'>=</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>
<a name="line-103"></a> <span class='hs-varid'>week</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'>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>
<a name="line-104"></a> <span class='hs-varid'>day</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-105"></a> <span class='hs-varid'>hour</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'>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>
<a name="line-106"></a> <span class='hs-varid'>minute</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'>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>
<a name="line-107"></a> <span class='hs-varid'>second</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'>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>
<a name="line-108"></a> <span class='hs-varid'>clockA</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toClockTime</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unsafeToCalendarTime</span> <span class='hs-varid'>a</span>
<a name="line-109"></a> <span class='hs-varid'>calB</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>resetCalendar</span> <span class='hs-varid'>b_</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="DateMatcher"></a><span class='hs-comment'>-- | A 'DateMatcher' combines a potential parse for a date string</span>
<a name="line-112"></a><a name="DateMatcher"></a><span class='hs-comment'>-- with a "matcher" function that operates on a given date.</span>
<a name="line-113"></a><a name="DateMatcher"></a><span class='hs-comment'>-- We use an existential type on the matcher to allow</span>
<a name="line-114"></a><a name="DateMatcher"></a><span class='hs-comment'>-- the date string to either be interpreted as a point in time</span>
<a name="line-115"></a><a name="DateMatcher"></a><span class='hs-comment'>-- or as an interval.</span>
<a name="line-116"></a><a name="DateMatcher"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DateMatcher</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>d</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>DM</span>
<a name="line-117"></a> <span class='hs-conid'>String</span> <span class='hs-comment'>-- name</span>
<a name="line-118"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>ParseError</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- parser</span>
<a name="line-119"></a> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- matcher</span>
<a name="line-120"></a>
<a name="line-121"></a><a name="parseDateMatcher"></a><span class='hs-comment'>-- | 'parseDateMatcher' @s@ return the first matcher in</span>
<a name="line-122"></a><span class='hs-comment'>-- 'getMatchers' that can parse 's'</span>
<a name="line-123"></a><span class='hs-definition'>parseDateMatcher</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-124"></a><span class='hs-definition'>parseDateMatcher</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>testDateMatcher</span> <span class='hs-varop'>`catchUserError`</span> <span class='hs-varid'>handleError</span>
<a name="line-125"></a> <span class='hs-keyword'>where</span>
<a name="line-126"></a> <span class='hs-varid'>catchUserError</span> <span class='hs-varid'>comp</span> <span class='hs-varid'>handler</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catch</span> <span class='hs-varid'>comp</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span>
<a name="line-127"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>isUserError</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>handler</span> <span class='hs-layout'>(</span><span class='hs-varid'>ioeGetErrorString</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>throw</span> <span class='hs-varid'>e</span>
<a name="line-128"></a>
<a name="line-129"></a> <span class='hs-comment'>-- If the user enters a date > maxint seconds ago, the toClockTime</span>
<a name="line-130"></a> <span class='hs-comment'>-- function cannot work.</span>
<a name="line-131"></a> <span class='hs-varid'>handleError</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>e</span> <span class='hs-varop'>==</span> <span class='hs-str'>"Time.toClockTime: invalid input"</span>
<a name="line-132"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>error</span> <span class='hs-str'>"Can't handle dates that far back!"</span>
<a name="line-133"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>error</span> <span class='hs-varid'>e</span>
<a name="line-134"></a>
<a name="line-135"></a> <span class='hs-comment'>-- Hack: test the matcher against the current date and discard the results.</span>
<a name="line-136"></a> <span class='hs-comment'>-- We just want to make sure it won't throw any exceptions when we use it</span>
<a name="line-137"></a> <span class='hs-comment'>-- for real.</span>
<a name="line-138"></a> <span class='hs-varid'>testDateMatcher</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-139"></a> <span class='hs-varid'>matcher</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>tryMatchers</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>getMatchers</span> <span class='hs-varid'>d</span>
<a name="line-140"></a> <span class='hs-varid'>matcher</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>now</span> <span class='hs-varop'>>>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>`seq`</span> <span class='hs-varid'>return</span> <span class='hs-varid'>matcher</span><span class='hs-layout'>)</span>
<a name="line-141"></a>
<a name="line-142"></a><a name="getMatchers"></a><span class='hs-comment'>-- | 'getMatchers' @d@ returns the list of matchers that will be</span>
<a name="line-143"></a><span class='hs-comment'>-- applied on @d@. If you wish to extend the date parsing code,</span>
<a name="line-144"></a><span class='hs-comment'>-- this will likely be the function that you modify to do so.</span>
<a name="line-145"></a><span class='hs-definition'>getMatchers</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DateMatcher</span><span class='hs-keyglyph'>]</span>
<a name="line-146"></a><span class='hs-definition'>getMatchers</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-147"></a> <span class='hs-varid'>rightNow</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>now</span>
<a name="line-148"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>midnightToday</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsetTime</span> <span class='hs-varid'>rightNow</span>
<a name="line-149"></a> <span class='hs-varid'>mRightNow</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toMCalendarTime</span> <span class='hs-varid'>rightNow</span>
<a name="line-150"></a> <span class='hs-varid'>matchIsoInterval</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>dur</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-151"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>durAgo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dur</span> <span class='hs-varop'>`subtractFromMCal`</span> <span class='hs-varid'>mRightNow</span> <span class='hs-keyword'>in</span>
<a name="line-152"></a> <span class='hs-varid'>dateRange</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>durAgo</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>mRightNow</span><span class='hs-layout'>)</span>
<a name="line-153"></a> <span class='hs-varid'>matchIsoInterval</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dateRange</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>
<a name="line-154"></a> <span class='hs-varid'>tzNow</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getLocalTz</span>
<a name="line-155"></a> <span class='hs-varid'>return</span>
<a name="line-156"></a> <span class='hs-comment'>-- note that the order of these is quite important as some matchers can</span>
<a name="line-157"></a> <span class='hs-comment'>-- match the same date.</span>
<a name="line-158"></a> <span class='hs-keyglyph'>[</span> <span class='hs-conid'>DM</span> <span class='hs-str'>"from English date"</span>
<a name="line-159"></a> <span class='hs-layout'>(</span><span class='hs-varid'>parseDateWith</span> <span class='hs-varop'>$</span> <span class='hs-varid'>englishLast</span> <span class='hs-varid'>midnightToday</span><span class='hs-layout'>)</span>
<a name="line-160"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>cDateRange</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-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-161"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DM</span> <span class='hs-str'>"specific English date"</span>
<a name="line-162"></a> <span class='hs-layout'>(</span><span class='hs-varid'>parseDateWith</span> <span class='hs-varop'>$</span> <span class='hs-varid'>englishDateTime</span> <span class='hs-varid'>midnightToday</span><span class='hs-layout'>)</span>
<a name="line-163"></a> <span class='hs-varid'>withinDay</span>
<a name="line-164"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DM</span> <span class='hs-str'>"English interval"</span>
<a name="line-165"></a> <span class='hs-layout'>(</span><span class='hs-varid'>parseDateWith</span> <span class='hs-varop'>$</span> <span class='hs-varid'>englishInterval</span> <span class='hs-varid'>rightNow</span><span class='hs-layout'>)</span>
<a name="line-166"></a> <span class='hs-layout'>(</span><span class='hs-varid'>uncurry</span> <span class='hs-varid'>cDateRange</span><span class='hs-layout'>)</span>
<a name="line-167"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DM</span> <span class='hs-str'>"ISO 8601 interval"</span>
<a name="line-168"></a> <span class='hs-layout'>(</span><span class='hs-varid'>parseDateWith</span> <span class='hs-varop'>$</span> <span class='hs-varid'>iso8601Interval</span> <span class='hs-varid'>tzNow</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <span class='hs-varid'>matchIsoInterval</span>
<a name="line-170"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DM</span> <span class='hs-str'>"CVS, ISO 8601, or old style date"</span>
<a name="line-171"></a> <span class='hs-layout'>(</span><span class='hs-varid'>parseDate</span> <span class='hs-varid'>tzNow</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-172"></a> <span class='hs-varid'>samePartialDate</span>
<a name="line-173"></a> <span class='hs-keyglyph'>]</span>
<a name="line-174"></a> <span class='hs-keyword'>where</span>
<a name="line-175"></a> <span class='hs-varid'>tillEof</span> <span class='hs-varid'>p</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'>p</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-176"></a> <span class='hs-varid'>parseDateWith</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parse</span> <span class='hs-layout'>(</span><span class='hs-varid'>tillEof</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span> <span class='hs-varid'>d</span>
<a name="line-177"></a>
<a name="line-178"></a><a name="tryMatchers"></a><span class='hs-comment'>-- | 'tryMatchers' @ms@ returns the first successful match in @ms@</span>
<a name="line-179"></a><span class='hs-comment'>-- It is an error if there are no matches</span>
<a name="line-180"></a><span class='hs-definition'>tryMatchers</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DateMatcher</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CalendarTime</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-181"></a><span class='hs-definition'>tryMatchers</span> <span class='hs-layout'>(</span><span class='hs-conid'>DM</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>parsed</span> <span class='hs-varid'>matcher</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-182"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>of</span>
<a name="line-183"></a> <span class='hs-conid'>Left</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>tryMatchers</span> <span class='hs-varid'>ms</span>
<a name="line-184"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>matcher</span> <span class='hs-varid'>d</span>
<a name="line-185"></a><span class='hs-definition'>tryMatchers</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"Can't support fancy dates."</span>
<a name="line-186"></a>
<a name="line-187"></a><a name="now"></a><span class='hs-definition'>now</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CalendarTime</span>
<a name="line-188"></a><span class='hs-definition'>now</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getClockTime</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>toCalendarTime</span>
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