mirror of
https://github.com/facebook/duckling.git
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5ac990bbe2
Summary: Add an option to return latent time entities. This can be used when one is pretty certain that the input contains a datetime. Reviewed By: patapizza Differential Revision: D7254245 fbshipit-source-id: e9e0503cace2691804056fcebdc18fd9090fb181
135 lines
4.3 KiB
Haskell
135 lines
4.3 KiB
Haskell
-- Copyright (c) 2016-present, Facebook, Inc.
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-- All rights reserved.
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--
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-- This source code is licensed under the BSD-style license found in the
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-- LICENSE file in the root directory of this source tree. An additional grant
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-- of patent rights can be found in the PATENTS file in the same directory.
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{-# LANGUAGE OverloadedStrings #-}
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import Control.Applicative hiding (empty)
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import Control.Arrow ((***))
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import Control.Monad (unless)
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import Control.Monad.IO.Class
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import Data.Aeson
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import Data.ByteString (ByteString, empty)
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import Data.HashMap.Strict (HashMap)
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import Data.Maybe
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import Data.String
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import Data.Text (Text)
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import Data.Time.LocalTime.TimeZone.Series
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import Prelude
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import System.Directory
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import TextShow
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import Text.Read (readMaybe)
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import qualified Data.ByteString.Lazy as LBS
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import qualified Data.HashMap.Strict as HashMap
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import qualified Data.Text as Text
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import qualified Data.Text.Encoding as Text
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import Data.Time.Clock.POSIX (posixSecondsToUTCTime)
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import Snap.Core
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import Snap.Http.Server
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import Duckling.Core
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import Duckling.Data.TimeZone
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import Duckling.Resolve (DucklingTime)
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createIfMissing :: FilePath -> IO ()
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createIfMissing f = do
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exists <- doesFileExist f
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unless exists $ writeFile f ""
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setupLogs :: IO ()
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setupLogs = do
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createDirectoryIfMissing False "log"
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createIfMissing "log/error.log"
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createIfMissing "log/access.log"
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main :: IO ()
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main = do
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setupLogs
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tzs <- loadTimeZoneSeries "/usr/share/zoneinfo/"
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quickHttpServe $
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ifTop (writeBS "quack!") <|>
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route
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[ ("targets", method GET targetsHandler)
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, ("parse", method POST $ parseHandler tzs)
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]
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-- | Return which languages have which dimensions
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targetsHandler :: Snap ()
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targetsHandler = do
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modifyResponse $ setHeader "Content-Type" "application/json"
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writeLBS $ encode $
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HashMap.fromList . map dimText $ HashMap.toList supportedDimensions
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where
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dimText :: (Lang, [Some Dimension]) -> (Text, [Text])
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dimText = (Text.toLower . showt) *** map (\(This d) -> toName d)
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-- | Parse some text into the given dimensions
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parseHandler :: HashMap Text TimeZoneSeries -> Snap ()
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parseHandler tzs = do
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modifyResponse $ setHeader "Content-Type" "application/json"
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t <- getPostParam "text"
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l <- getPostParam "lang"
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ds <- getPostParam "dims"
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tz <- getPostParam "tz"
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loc <- getPostParam "locale"
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ref <- getPostParam "reftime"
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latent <- getPostParam "latent"
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case t of
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Nothing -> do
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modifyResponse $ setResponseStatus 422 "Bad Input"
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writeBS "Need a 'text' parameter to parse"
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Just tx -> do
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let timezone = parseTimeZone tz
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now <- liftIO $ currentReftime tzs timezone
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let
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context = Context
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{ referenceTime = maybe now (parseRefTime timezone) ref
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, locale = maybe (makeLocale (parseLang l) Nothing) parseLocale loc
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}
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options = Options {withLatent = parseLatent latent}
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dimParse = fromMaybe [] $ decode $ LBS.fromStrict $ fromMaybe "" ds
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dims = mapMaybe fromName dimParse
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parsedResult = parse (Text.decodeUtf8 tx) context options dims
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writeLBS $ encode parsedResult
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where
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defaultLang = EN
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defaultLocale = makeLocale defaultLang Nothing
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defaultTimeZone = "America/Los_Angeles"
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defaultLatent = False
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parseTimeZone :: Maybe ByteString -> Text
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parseTimeZone = fromMaybe defaultTimeZone . fmap Text.decodeUtf8
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parseLocale :: ByteString -> Locale
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parseLocale x = maybe defaultLocale (`makeLocale` mregion) mlang
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where
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(mlang, mregion) = case chunks of
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[a, b] -> (readMaybe a :: Maybe Lang, readMaybe b :: Maybe Region)
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_ -> (Nothing, Nothing)
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chunks = map Text.unpack . Text.split (== '_') . Text.toUpper
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$ Text.decodeUtf8 x
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parseLang :: Maybe ByteString -> Lang
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parseLang l = fromMaybe defaultLang $ l >>=
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readMaybe . Text.unpack . Text.toUpper . Text.decodeUtf8
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parseRefTime :: Text -> ByteString -> DucklingTime
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parseRefTime timezone refTime = makeReftime tzs timezone utcTime
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where
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msec = read $ Text.unpack $ Text.decodeUtf8 refTime
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utcTime = posixSecondsToUTCTime $ fromInteger msec / 1000
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parseLatent :: Maybe ByteString -> Bool
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parseLatent x = fromMaybe defaultLatent
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(readMaybe (Text.unpack $ Text.toTitle $ Text.decodeUtf8 $ fromMaybe empty x)::Maybe Bool)
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