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hledger/hledger-lib/Hledger/Data/Dates.hs
Simon Michael f84324682e lib: fix a doctest in Hledger.Data.Dates
2016-12-29 11:33:33 -08:00

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{-# LANGUAGE CPP #-}
{-# LANGUAGE NoMonoLocalBinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE OverloadedStrings #-}
{-|
Date parsing and utilities for hledger.
For date and time values, we use the standard Day and UTCTime types.
A 'SmartDate' is a date which may be partially-specified or relative.
Eg 2008\/12\/31, but also 2008\/12, 12\/31, tomorrow, last week, next year.
We represent these as a triple of strings like (\"2008\",\"12\",\"\"),
(\"\",\"\",\"tomorrow\"), (\"\",\"last\",\"week\").
A 'DateSpan' is the span of time between two specific calendar dates, or
an open-ended span where one or both dates are unspecified. (A date span
with both ends unspecified matches all dates.)
An 'Interval' is ledger's \"reporting interval\" - weekly, monthly,
quarterly, etc.
'Period' will probably replace DateSpan in due course.
-}
-- XXX fromGregorian silently clips bad dates, use fromGregorianValid instead ?
module Hledger.Data.Dates (
-- * Misc date handling utilities
getCurrentDay,
getCurrentMonth,
getCurrentYear,
nulldate,
spanContainsDate,
periodContainsDate,
parsedateM,
parsedate,
showDate,
showDateSpan,
elapsedSeconds,
prevday,
parsePeriodExpr,
nulldatespan,
failIfInvalidYear,
failIfInvalidMonth,
failIfInvalidDay,
datesepchar,
datesepchars,
spanStart,
spanEnd,
spansSpan,
spanIntersect,
spansIntersect,
spanDefaultsFrom,
spanUnion,
spansUnion,
smartdate,
splitSpan,
fixSmartDate,
fixSmartDateStr,
fixSmartDateStrEither,
fixSmartDateStrEither',
daysInSpan,
maybePeriod,
mkdatespan,
)
where
import Prelude ()
import Prelude.Compat
import Control.Monad
import Data.List.Compat
import Data.Maybe
import Data.Text (Text)
import qualified Data.Text as T
#if MIN_VERSION_time(1,5,0)
import Data.Time.Format hiding (months)
#else
import Data.Time.Format
import System.Locale (TimeLocale, defaultTimeLocale)
#endif
import Data.Time.Calendar
import Data.Time.Calendar.OrdinalDate
import Data.Time.Clock
import Data.Time.LocalTime
import Safe (headMay, lastMay, readMay)
import Text.Megaparsec
import Text.Megaparsec.Text
import Text.Printf
import Hledger.Data.Types
import Hledger.Data.Period
import Hledger.Utils
-- Help ppShow parse and line-wrap DateSpans better in debug output.
instance Show DateSpan where
show s = "DateSpan " ++ showDateSpan s
-- show s = "DateSpan \"" ++ showDateSpan s ++ "\"" -- quotes to help pretty-show
showDate :: Day -> String
showDate = formatTime defaultTimeLocale "%0C%y/%m/%d"
-- | Render a datespan as a display string, abbreviating into a
-- compact form if possible.
showDateSpan :: DateSpan -> String
showDateSpan = showPeriod . dateSpanAsPeriod
-- | Get the current local date.
getCurrentDay :: IO Day
getCurrentDay = do
t <- getZonedTime
return $ localDay (zonedTimeToLocalTime t)
-- | Get the current local month number.
getCurrentMonth :: IO Int
getCurrentMonth = do
(_,m,_) <- toGregorian `fmap` getCurrentDay
return m
-- | Get the current local year.
getCurrentYear :: IO Integer
getCurrentYear = do
(y,_,_) <- toGregorian `fmap` getCurrentDay
return y
elapsedSeconds :: Fractional a => UTCTime -> UTCTime -> a
elapsedSeconds t1 = realToFrac . diffUTCTime t1
spanStart :: DateSpan -> Maybe Day
spanStart (DateSpan d _) = d
spanEnd :: DateSpan -> Maybe Day
spanEnd (DateSpan _ d) = d
-- might be useful later: http://en.wikipedia.org/wiki/Allen%27s_interval_algebra
-- | Get overall span enclosing multiple sequentially ordered spans.
spansSpan :: [DateSpan] -> DateSpan
spansSpan spans = DateSpan (maybe Nothing spanStart $ headMay spans) (maybe Nothing spanEnd $ lastMay spans)
-- | Split a DateSpan into one or more consecutive whole spans of the specified length which enclose it.
-- If no interval is specified, the original span is returned.
--
-- ==== Examples:
-- >>> let t i d1 d2 = splitSpan i $ mkdatespan d1 d2
-- >>> t NoInterval "2008/01/01" "2009/01/01"
-- [DateSpan 2008]
-- >>> t (Quarters 1) "2008/01/01" "2009/01/01"
-- [DateSpan 2008q1,DateSpan 2008q2,DateSpan 2008q3,DateSpan 2008q4]
-- >>> splitSpan (Quarters 1) nulldatespan
-- [DateSpan -]
-- >>> t (Days 1) "2008/01/01" "2008/01/01" -- an empty datespan
-- [DateSpan 2008/01/01-2007/12/31]
-- >>> t (Quarters 1) "2008/01/01" "2008/01/01"
-- [DateSpan 2008/01/01-2007/12/31]
-- >>> t (Months 1) "2008/01/01" "2008/04/01"
-- [DateSpan 2008/01,DateSpan 2008/02,DateSpan 2008/03]
-- >>> t (Months 2) "2008/01/01" "2008/04/01"
-- [DateSpan 2008/01/01-2008/02/29,DateSpan 2008/03/01-2008/04/30]
-- >>> t (Weeks 1) "2008/01/01" "2008/01/15"
-- [DateSpan 2007/12/31w01,DateSpan 2008/01/07w02,DateSpan 2008/01/14w03]
-- >>> t (Weeks 2) "2008/01/01" "2008/01/15"
-- [DateSpan 2007/12/31-2008/01/13,DateSpan 2008/01/14-2008/01/27]
-- >>> t (DayOfMonth 2) "2008/01/01" "2008/04/01"
-- [DateSpan 2008/01/02-2008/02/01,DateSpan 2008/02/02-2008/03/01,DateSpan 2008/03/02-2008/04/01]
-- >>> t (DayOfWeek 2) "2011/01/01" "2011/01/15"
-- [DateSpan 2011/01/04-2011/01/10,DateSpan 2011/01/11-2011/01/17]
--
splitSpan :: Interval -> DateSpan -> [DateSpan]
splitSpan _ (DateSpan Nothing Nothing) = [DateSpan Nothing Nothing]
splitSpan NoInterval s = [s]
splitSpan (Days n) s = splitspan startofday (applyN n nextday) s
splitSpan (Weeks n) s = splitspan startofweek (applyN n nextweek) s
splitSpan (Months n) s = splitspan startofmonth (applyN n nextmonth) s
splitSpan (Quarters n) s = splitspan startofquarter (applyN n nextquarter) s
splitSpan (Years n) s = splitspan startofyear (applyN n nextyear) s
splitSpan (DayOfMonth n) s = splitspan (nthdayofmonthcontaining n) (applyN (n-1) nextday . nextmonth) s
splitSpan (DayOfWeek n) s = splitspan (nthdayofweekcontaining n) (applyN (n-1) nextday . nextweek) s
-- splitSpan (WeekOfYear n) s = splitspan startofweek (applyN n nextweek) s
-- splitSpan (MonthOfYear n) s = splitspan startofmonth (applyN n nextmonth) s
-- splitSpan (QuarterOfYear n) s = splitspan startofquarter (applyN n nextquarter) s
-- Split the given span using the provided helper functions:
-- start is applied to the span's start date to get the first sub-span's start date
-- next is applied to a sub-span's start date to get the next sub-span's start date
splitspan :: (Day -> Day) -> (Day -> Day) -> DateSpan -> [DateSpan]
splitspan _ _ (DateSpan Nothing Nothing) = []
splitspan start next (DateSpan Nothing (Just e)) = splitspan start next (DateSpan (Just $ start e) (Just $ next $ start e))
splitspan start next (DateSpan (Just s) Nothing) = splitspan start next (DateSpan (Just $ start s) (Just $ next $ start s))
splitspan start next span@(DateSpan (Just s) (Just e))
| s == e = [span]
| otherwise = splitspan' start next span
where
splitspan' start next (DateSpan (Just s) (Just e))
| s >= e = []
| otherwise = DateSpan (Just subs) (Just sube) : splitspan' start next (DateSpan (Just sube) (Just e))
where subs = start s
sube = next subs
splitspan' _ _ _ = error' "won't happen, avoids warnings"
-- | Count the days in a DateSpan, or if it is open-ended return Nothing.
daysInSpan :: DateSpan -> Maybe Integer
daysInSpan (DateSpan (Just d1) (Just d2)) = Just $ diffDays d2 d1
daysInSpan _ = Nothing
-- | Does the span include the given date ?
spanContainsDate :: DateSpan -> Day -> Bool
spanContainsDate (DateSpan Nothing Nothing) _ = True
spanContainsDate (DateSpan Nothing (Just e)) d = d < e
spanContainsDate (DateSpan (Just b) Nothing) d = d >= b
spanContainsDate (DateSpan (Just b) (Just e)) d = d >= b && d < e
-- | Does the period include the given date ?
-- (Here to avoid import cycle).
periodContainsDate :: Period -> Day -> Bool
periodContainsDate p = spanContainsDate (periodAsDateSpan p)
-- | Calculate the intersection of a number of datespans.
spansIntersect [] = nulldatespan
spansIntersect [d] = d
spansIntersect (d:ds) = d `spanIntersect` (spansIntersect ds)
-- | Calculate the intersection of two datespans.
spanIntersect (DateSpan b1 e1) (DateSpan b2 e2) = DateSpan b e
where
b = latest b1 b2
e = earliest e1 e2
-- | Fill any unspecified dates in the first span with the dates from
-- the second one. Sort of a one-way spanIntersect.
spanDefaultsFrom (DateSpan a1 b1) (DateSpan a2 b2) = DateSpan a b
where a = if isJust a1 then a1 else a2
b = if isJust b1 then b1 else b2
-- | Calculate the union of a number of datespans.
spansUnion [] = nulldatespan
spansUnion [d] = d
spansUnion (d:ds) = d `spanUnion` (spansUnion ds)
-- | Calculate the union of two datespans.
spanUnion (DateSpan b1 e1) (DateSpan b2 e2) = DateSpan b e
where
b = earliest b1 b2
e = latest e1 e2
latest d Nothing = d
latest Nothing d = d
latest (Just d1) (Just d2) = Just $ max d1 d2
earliest d Nothing = d
earliest Nothing d = d
earliest (Just d1) (Just d2) = Just $ min d1 d2
-- | Parse a period expression to an Interval and overall DateSpan using
-- the provided reference date, or return a parse error.
parsePeriodExpr :: Day -> Text -> Either (ParseError Char Dec) (Interval, DateSpan)
parsePeriodExpr refdate = parsewith (periodexpr refdate <* eof)
maybePeriod :: Day -> Text -> Maybe (Interval,DateSpan)
maybePeriod refdate = either (const Nothing) Just . parsePeriodExpr refdate
-- | Show a DateSpan as a human-readable pseudo-period-expression string.
-- dateSpanAsText :: DateSpan -> String
-- dateSpanAsText (DateSpan Nothing Nothing) = "all"
-- dateSpanAsText (DateSpan Nothing (Just e)) = printf "to %s" (show e)
-- dateSpanAsText (DateSpan (Just b) Nothing) = printf "from %s" (show b)
-- dateSpanAsText (DateSpan (Just b) (Just e)) = printf "%s to %s" (show b) (show e)
-- | Convert a single smart date string to a date span using the provided
-- reference date, or raise an error.
-- spanFromSmartDateString :: Day -> String -> DateSpan
-- spanFromSmartDateString refdate s = spanFromSmartDate refdate sdate
-- where
-- sdate = fromparse $ parsewith smartdateonly s
spanFromSmartDate :: Day -> SmartDate -> DateSpan
spanFromSmartDate refdate sdate = DateSpan (Just b) (Just e)
where
(ry,rm,_) = toGregorian refdate
(b,e) = span sdate
span :: SmartDate -> (Day,Day)
span ("","","today") = (refdate, nextday refdate)
span ("","this","day") = (refdate, nextday refdate)
span ("","","yesterday") = (prevday refdate, refdate)
span ("","last","day") = (prevday refdate, refdate)
span ("","","tomorrow") = (nextday refdate, addDays 2 refdate)
span ("","next","day") = (nextday refdate, addDays 2 refdate)
span ("","last","week") = (prevweek refdate, thisweek refdate)
span ("","this","week") = (thisweek refdate, nextweek refdate)
span ("","next","week") = (nextweek refdate, startofweek $ addDays 14 refdate)
span ("","last","month") = (prevmonth refdate, thismonth refdate)
span ("","this","month") = (thismonth refdate, nextmonth refdate)
span ("","next","month") = (nextmonth refdate, startofmonth $ addGregorianMonthsClip 2 refdate)
span ("","last","quarter") = (prevquarter refdate, thisquarter refdate)
span ("","this","quarter") = (thisquarter refdate, nextquarter refdate)
span ("","next","quarter") = (nextquarter refdate, startofquarter $ addGregorianMonthsClip 6 refdate)
span ("","last","year") = (prevyear refdate, thisyear refdate)
span ("","this","year") = (thisyear refdate, nextyear refdate)
span ("","next","year") = (nextyear refdate, startofyear $ addGregorianYearsClip 2 refdate)
span ("","",d) = (day, nextday day) where day = fromGregorian ry rm (read d)
span ("",m,"") = (startofmonth day, nextmonth day) where day = fromGregorian ry (read m) 1
span ("",m,d) = (day, nextday day) where day = fromGregorian ry (read m) (read d)
span (y,"","") = (startofyear day, nextyear day) where day = fromGregorian (read y) 1 1
span (y,m,"") = (startofmonth day, nextmonth day) where day = fromGregorian (read y) (read m) 1
span (y,m,d) = (day, nextday day) where day = fromGregorian (read y) (read m) (read d)
-- showDay :: Day -> String
-- showDay day = printf "%04d/%02d/%02d" y m d where (y,m,d) = toGregorian day
-- | Convert a smart date string to an explicit yyyy\/mm\/dd string using
-- the provided reference date, or raise an error.
fixSmartDateStr :: Day -> Text -> String
fixSmartDateStr d s = either
(\e->error' $ printf "could not parse date %s %s" (show s) (show e))
id
$ (fixSmartDateStrEither d s :: Either (ParseError Char Dec) String)
-- | A safe version of fixSmartDateStr.
fixSmartDateStrEither :: Day -> Text -> Either (ParseError Char Dec) String
fixSmartDateStrEither d = either Left (Right . showDate) . fixSmartDateStrEither' d
fixSmartDateStrEither' :: Day -> Text -> Either (ParseError Char Dec) Day
fixSmartDateStrEither' d s = case parsewith smartdateonly (T.toLower s) of
Right sd -> Right $ fixSmartDate d sd
Left e -> Left e
-- | Convert a SmartDate to an absolute date using the provided reference date.
--
-- ==== Examples:
-- >>> :set -XOverloadedStrings
-- >>> let t = fixSmartDateStr (parsedate "2008/11/26")
-- >>> t "0000-01-01"
-- "0000/01/01"
-- >>> t "1999-12-02"
-- "1999/12/02"
-- >>> t "1999.12.02"
-- "1999/12/02"
-- >>> t "1999/3/2"
-- "1999/03/02"
-- >>> t "19990302"
-- "1999/03/02"
-- >>> t "2008/2"
-- "2008/02/01"
-- >>> t "0020/2"
-- "0020/02/01"
-- >>> t "1000"
-- "1000/01/01"
-- >>> t "4/2"
-- "2008/04/02"
-- >>> t "2"
-- "2008/11/02"
-- >>> t "January"
-- "2008/01/01"
-- >>> t "feb"
-- "2008/02/01"
-- >>> t "today"
-- "2008/11/26"
-- >>> t "yesterday"
-- "2008/11/25"
-- >>> t "tomorrow"
-- "2008/11/27"
-- >>> t "this day"
-- "2008/11/26"
-- >>> t "last day"
-- "2008/11/25"
-- >>> t "next day"
-- "2008/11/27"
-- >>> t "this week" -- last monday
-- "2008/11/24"
-- >>> t "last week" -- previous monday
-- "2008/11/17"
-- >>> t "next week" -- next monday
-- "2008/12/01"
-- >>> t "this month"
-- "2008/11/01"
-- >>> t "last month"
-- "2008/10/01"
-- >>> t "next month"
-- "2008/12/01"
-- >>> t "this quarter"
-- "2008/10/01"
-- >>> t "last quarter"
-- "2008/07/01"
-- >>> t "next quarter"
-- "2009/01/01"
-- >>> t "this year"
-- "2008/01/01"
-- >>> t "last year"
-- "2007/01/01"
-- >>> t "next year"
-- "2009/01/01"
--
-- t "last wed"
-- "2008/11/19"
-- t "next friday"
-- "2008/11/28"
-- t "next january"
-- "2009/01/01"
--
fixSmartDate :: Day -> SmartDate -> Day
fixSmartDate refdate sdate = fix sdate
where
fix :: SmartDate -> Day
fix ("","","today") = fromGregorian ry rm rd
fix ("","this","day") = fromGregorian ry rm rd
fix ("","","yesterday") = prevday refdate
fix ("","last","day") = prevday refdate
fix ("","","tomorrow") = nextday refdate
fix ("","next","day") = nextday refdate
fix ("","last","week") = prevweek refdate
fix ("","this","week") = thisweek refdate
fix ("","next","week") = nextweek refdate
fix ("","last","month") = prevmonth refdate
fix ("","this","month") = thismonth refdate
fix ("","next","month") = nextmonth refdate
fix ("","last","quarter") = prevquarter refdate
fix ("","this","quarter") = thisquarter refdate
fix ("","next","quarter") = nextquarter refdate
fix ("","last","year") = prevyear refdate
fix ("","this","year") = thisyear refdate
fix ("","next","year") = nextyear refdate
fix ("","",d) = fromGregorian ry rm (read d)
fix ("",m,"") = fromGregorian ry (read m) 1
fix ("",m,d) = fromGregorian ry (read m) (read d)
fix (y,"","") = fromGregorian (read y) 1 1
fix (y,m,"") = fromGregorian (read y) (read m) 1
fix (y,m,d) = fromGregorian (read y) (read m) (read d)
(ry,rm,rd) = toGregorian refdate
prevday :: Day -> Day
prevday = addDays (-1)
nextday = addDays 1
startofday = id
thisweek = startofweek
prevweek = startofweek . addDays (-7)
nextweek = startofweek . addDays 7
startofweek day = fromMondayStartWeek y w 1
where
(y,_,_) = toGregorian day
(w,_) = mondayStartWeek day
thismonth = startofmonth
prevmonth = startofmonth . addGregorianMonthsClip (-1)
nextmonth = startofmonth . addGregorianMonthsClip 1
startofmonth day = fromGregorian y m 1 where (y,m,_) = toGregorian day
thisquarter = startofquarter
prevquarter = startofquarter . addGregorianMonthsClip (-3)
nextquarter = startofquarter . addGregorianMonthsClip 3
startofquarter day = fromGregorian y (firstmonthofquarter m) 1
where
(y,m,_) = toGregorian day
firstmonthofquarter m = ((m-1) `div` 3) * 3 + 1
thisyear = startofyear
prevyear = startofyear . addGregorianYearsClip (-1)
nextyear = startofyear . addGregorianYearsClip 1
startofyear day = fromGregorian y 1 1 where (y,_,_) = toGregorian day
nthdayofmonthcontaining n d | d1 >= d = d1
| otherwise = d2
where d1 = addDays (fromIntegral n-1) s
d2 = addDays (fromIntegral n-1) $ nextmonth s
s = startofmonth d
nthdayofweekcontaining n d | d1 >= d = d1
| otherwise = d2
where d1 = addDays (fromIntegral n-1) s
d2 = addDays (fromIntegral n-1) $ nextweek s
s = startofweek d
----------------------------------------------------------------------
-- parsing
-- -- | Parse a couple of date-time string formats to a time type.
-- parsedatetimeM :: String -> Maybe LocalTime
-- parsedatetimeM s = firstJust [
-- parseTime defaultTimeLocale "%Y/%m/%d %H:%M:%S" s,
-- parseTime defaultTimeLocale "%Y-%m-%d %H:%M:%S" s
-- ]
parsetime :: ParseTime t => TimeLocale -> String -> String -> Maybe t
parsetime =
#if MIN_VERSION_time(1,5,0)
parseTimeM True
#else
parseTime
#endif
-- | Parse a couple of date string formats to a time type.
parsedateM :: String -> Maybe Day
parsedateM s = firstJust [
parsetime defaultTimeLocale "%Y/%m/%d" s,
parsetime defaultTimeLocale "%Y-%m-%d" s
]
-- -- | Parse a date-time string to a time type, or raise an error.
-- parsedatetime :: String -> LocalTime
-- parsedatetime s = fromMaybe (error' $ "could not parse timestamp \"" ++ s ++ "\"")
-- (parsedatetimeM s)
-- | Parse a YYYY-MM-DD or YYYY/MM/DD date string to a Day, or raise an error. For testing/debugging.
--
-- >>> parsedate "2008/02/03"
-- 2008-02-03
parsedate :: String -> Day
parsedate s = fromMaybe (error' $ "could not parse date \"" ++ s ++ "\"")
(parsedateM s)
-- doctests I haven't been able to make compatible with both GHC 7 and 8
-- -- >>> parsedate "2008/02/03/"
-- -- *** Exception: could not parse date "2008/02/03/"
-- #if MIN_VERSION_base(4,9,0)
-- -- ...
-- #endif
-- #if MIN_VERSION_time(1,6,0)
-- -- >>> parsedate "2008/02/30" -- with time >= 1.6, invalid dates are rejected
-- -- *** Exception: could not parse date "2008/02/30"
-- #if MIN_VERSION_base(4,9,0)
-- -- ...
-- #endif
-- #else
-- -- >>> parsedate "2008/02/30" -- with time < 1.6, they are silently adjusted
-- -- 2008-02-29
-- #endif
-- | Parse a time string to a time type using the provided pattern, or
-- return the default.
_parsetimewith :: ParseTime t => String -> String -> t -> t
_parsetimewith pat s def = fromMaybe def $ parsetime defaultTimeLocale pat s
{-|
Parse a date in any of the formats allowed in ledger's period expressions,
and maybe some others:
> 2004
> 2004/10
> 2004/10/1
> 10/1
> 21
> october, oct
> yesterday, today, tomorrow
> this/next/last week/day/month/quarter/year
Returns a SmartDate, to be converted to a full date later (see fixSmartDate).
Assumes any text in the parse stream has been lowercased.
-}
smartdate :: Parser SmartDate
smartdate = do
-- XXX maybe obscures date errors ? see ledgerdate
(y,m,d) <- choice' [yyyymmdd, ymd, ym, md, y, d, month, mon, today, yesterday, tomorrow, lastthisnextthing]
return (y,m,d)
-- | Like smartdate, but there must be nothing other than whitespace after the date.
smartdateonly :: Parser SmartDate
smartdateonly = do
d <- smartdate
many spacenonewline
eof
return d
datesepchars :: [Char]
datesepchars = "/-."
datesepchar :: TextParser m Char
datesepchar = oneOf datesepchars
validYear, validMonth, validDay :: String -> Bool
validYear s = length s >= 4 && isJust (readMay s :: Maybe Year)
validMonth s = maybe False (\n -> n>=1 && n<=12) $ readMay s
validDay s = maybe False (\n -> n>=1 && n<=31) $ readMay s
failIfInvalidYear, failIfInvalidMonth, failIfInvalidDay :: (Monad m) => String -> m ()
failIfInvalidYear s = unless (validYear s) $ fail $ "bad year number: " ++ s
failIfInvalidMonth s = unless (validMonth s) $ fail $ "bad month number: " ++ s
failIfInvalidDay s = unless (validDay s) $ fail $ "bad day number: " ++ s
yyyymmdd :: Parser SmartDate
yyyymmdd = do
y <- count 4 digitChar
m <- count 2 digitChar
failIfInvalidMonth m
d <- count 2 digitChar
failIfInvalidDay d
return (y,m,d)
ymd :: Parser SmartDate
ymd = do
y <- some digitChar
failIfInvalidYear y
sep <- datesepchar
m <- some digitChar
failIfInvalidMonth m
char sep
d <- some digitChar
failIfInvalidDay d
return $ (y,m,d)
ym :: Parser SmartDate
ym = do
y <- some digitChar
failIfInvalidYear y
datesepchar
m <- some digitChar
failIfInvalidMonth m
return (y,m,"")
y :: Parser SmartDate
y = do
y <- some digitChar
failIfInvalidYear y
return (y,"","")
d :: Parser SmartDate
d = do
d <- some digitChar
failIfInvalidDay d
return ("","",d)
md :: Parser SmartDate
md = do
m <- some digitChar
failIfInvalidMonth m
datesepchar
d <- some digitChar
failIfInvalidDay d
return ("",m,d)
months = ["january","february","march","april","may","june",
"july","august","september","october","november","december"]
monthabbrevs = ["jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec"]
-- weekdays = ["monday","tuesday","wednesday","thursday","friday","saturday","sunday"]
-- weekdayabbrevs = ["mon","tue","wed","thu","fri","sat","sun"]
monthIndex s = maybe 0 (+1) $ lowercase s `elemIndex` months
monIndex s = maybe 0 (+1) $ lowercase s `elemIndex` monthabbrevs
month :: Parser SmartDate
month = do
m <- choice $ map (try . string) months
let i = monthIndex m
return ("",show i,"")
mon :: Parser SmartDate
mon = do
m <- choice $ map (try . string) monthabbrevs
let i = monIndex m
return ("",show i,"")
today,yesterday,tomorrow :: Parser SmartDate
today = string "today" >> return ("","","today")
yesterday = string "yesterday" >> return ("","","yesterday")
tomorrow = string "tomorrow" >> return ("","","tomorrow")
lastthisnextthing :: Parser SmartDate
lastthisnextthing = do
r <- choice [
string "last"
,string "this"
,string "next"
]
many spacenonewline -- make the space optional for easier scripting
p <- choice [
string "day"
,string "week"
,string "month"
,string "quarter"
,string "year"
]
-- XXX support these in fixSmartDate
-- ++ (map string $ months ++ monthabbrevs ++ weekdays ++ weekdayabbrevs)
return ("",r,p)
-- |
-- >>> let p = parsewith (periodexpr (parsedate "2008/11/26")) :: T.Text -> Either (ParseError Char Dec) (Interval, DateSpan)
-- >>> p "from aug to oct"
-- Right (NoInterval,DateSpan 2008/08/01-2008/09/30)
-- >>> p "aug to oct"
-- Right (NoInterval,DateSpan 2008/08/01-2008/09/30)
-- >>> p "every 3 days in aug"
-- Right (Days 3,DateSpan 2008/08)
-- >>> p "daily from aug"
-- Right (Days 1,DateSpan 2008/08/01-)
-- >>> p "every week to 2009"
-- Right (Weeks 1,DateSpan -2008/12/31)
periodexpr :: Day -> Parser (Interval, DateSpan)
periodexpr rdate = choice $ map try [
intervalanddateperiodexpr rdate,
intervalperiodexpr,
dateperiodexpr rdate,
(return (NoInterval,DateSpan Nothing Nothing))
]
intervalanddateperiodexpr :: Day -> Parser (Interval, DateSpan)
intervalanddateperiodexpr rdate = do
many spacenonewline
i <- reportinginterval
many spacenonewline
s <- periodexprdatespan rdate
return (i,s)
intervalperiodexpr :: Parser (Interval, DateSpan)
intervalperiodexpr = do
many spacenonewline
i <- reportinginterval
return (i, DateSpan Nothing Nothing)
dateperiodexpr :: Day -> Parser (Interval, DateSpan)
dateperiodexpr rdate = do
many spacenonewline
s <- periodexprdatespan rdate
return (NoInterval, s)
-- Parse a reporting interval.
reportinginterval :: Parser Interval
reportinginterval = choice' [
tryinterval "day" "daily" Days,
tryinterval "week" "weekly" Weeks,
tryinterval "month" "monthly" Months,
tryinterval "quarter" "quarterly" Quarters,
tryinterval "year" "yearly" Years,
do string "biweekly"
return $ Weeks 2,
do string "bimonthly"
return $ Months 2,
do string "every"
many spacenonewline
n <- fmap read $ some digitChar
thsuffix
many spacenonewline
string "day"
many spacenonewline
string "of"
many spacenonewline
string "week"
return $ DayOfWeek n,
do string "every"
many spacenonewline
n <- fmap read $ some digitChar
thsuffix
many spacenonewline
string "day"
optional $ do
many spacenonewline
string "of"
many spacenonewline
string "month"
return $ DayOfMonth n
]
where
thsuffix = choice' $ map string ["st","nd","rd","th"]
-- Parse any of several variants of a basic interval, eg "daily", "every day", "every N days".
tryinterval :: String -> String -> (Int -> Interval) -> Parser Interval
tryinterval singular compact intcons =
choice' [
do string compact
return $ intcons 1,
do string "every"
many spacenonewline
string singular
return $ intcons 1,
do string "every"
many spacenonewline
n <- fmap read $ some digitChar
many spacenonewline
string plural
return $ intcons n
]
where plural = singular ++ "s"
periodexprdatespan :: Day -> Parser DateSpan
periodexprdatespan rdate = choice $ map try [
doubledatespan rdate,
fromdatespan rdate,
todatespan rdate,
justdatespan rdate
]
doubledatespan :: Day -> Parser DateSpan
doubledatespan rdate = do
optional (string "from" >> many spacenonewline)
b <- smartdate
many spacenonewline
optional (choice [string "to", string "-"] >> many spacenonewline)
e <- smartdate
return $ DateSpan (Just $ fixSmartDate rdate b) (Just $ fixSmartDate rdate e)
fromdatespan :: Day -> Parser DateSpan
fromdatespan rdate = do
b <- choice [
do
string "from" >> many spacenonewline
smartdate
,
do
d <- smartdate
string "-"
return d
]
return $ DateSpan (Just $ fixSmartDate rdate b) Nothing
todatespan :: Day -> Parser DateSpan
todatespan rdate = do
choice [string "to", string "-"] >> many spacenonewline
e <- smartdate
return $ DateSpan Nothing (Just $ fixSmartDate rdate e)
justdatespan :: Day -> Parser DateSpan
justdatespan rdate = do
optional (string "in" >> many spacenonewline)
d <- smartdate
return $ spanFromSmartDate rdate d
-- | Make a datespan from two valid date strings parseable by parsedate
-- (or raise an error). Eg: mkdatespan \"2011/1/1\" \"2011/12/31\".
mkdatespan :: String -> String -> DateSpan
mkdatespan b = DateSpan (Just $ parsedate b) . Just . parsedate
nulldatespan :: DateSpan
nulldatespan = DateSpan Nothing Nothing
nulldate :: Day
nulldate = fromGregorian 0 1 1
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