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| -rw-r--r-- | .gitignore | 8 | ||||
| -rw-r--r-- | DBpedia.hs | 90 | ||||
| -rw-r--r-- | HACKING | 27 | ||||
| -rw-r--r-- | LICENSE | 675 | ||||
| -rw-r--r-- | Main.hs | 58 | ||||
| -rw-r--r-- | RequestMethod.hs | 42 | ||||
| -rw-r--r-- | SamplePlugin.hs | 30 | ||||
| -rw-r--r-- | Setup.hs | 2 | ||||
| -rw-r--r-- | ageOf.cabal | 30 |
9 files changed, 962 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..578d817 --- /dev/null +++ b/.gitignore @@ -0,0 +1,8 @@ +# .gitignore for ageOf -*- conf -*- + +# Editor backup files +*~ + +# cabal-dev files +cabal-dev/ +dist/ diff --git a/DBpedia.hs b/DBpedia.hs new file mode 100644 index 0000000..1f4d74b --- /dev/null +++ b/DBpedia.hs @@ -0,0 +1,90 @@ +{- DBpedia.hs -- requesting ages from DBpedia +Copyright (C) 2012 Benjamin Barenblat <benjamin@barenblat.name> + +This module is a part of ageOf. + +ageOf is free software: you can redistribute it and/or modify it under the +terms of the GNU General Public License as published by the Free Software +Foundation, either version 3 of the License, or (at your option) any later +version. + +ageOf is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A +PARTICULAR PURPOSE. See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along with +ageOf. If not, see <http://www.gnu.org/licenses/>. -} + +module DBpedia (dbpedia) where + +import Control.Monad (void) +import Database.HSparql.Connection +import Database.HSparql.QueryGenerator +import qualified Data.Time as Time (Day, parseTime) +import qualified Data.RDF as RDF (Node(..), LValue(..)) +import qualified Data.Text as Text (unpack) +import System.CurrentLocale (currentLocale) +import System.Locale (TimeLocale) + +import RequestMethod (RequestMethod(BirthDateFunction)) + +-- The DBpedia plugin, defined by the single function 'getBirthDate'. +dbpedia :: RequestMethod +dbpedia = BirthDateFunction getBirthDate + +getBirthDate :: String -> IO (Maybe Time.Day) +getBirthDate name = do + locale <- currentLocale + response <- askDBpedia $ selectBirthDate name + return $ case response of + Nothing -> Nothing + Just Unbound -> Nothing + Just (Bound node) -> parseAsDate locale node + +{- Generates a DBpedia SELECT query for a person's birth date. You can see the +generated query by running 'putStrLn $ createSelectQuery simpleSelect'. -} +selectBirthDate :: String -> Query SelectQuery +selectBirthDate name = do + -- Variables + page <- var + birthDate <- var + -- Prefixes + dbpprop <- prefix "dbprop" $ iriRef "http://dbpedia.org/property/" + rdfs <- prefix "rdfs" $ iriRef "http://www.w3.org/2000/01/rdf-schema#" + -- Okay, here we go. + let query = SelectQuery [birthDate] + void $ triple page (rdfs .:. "label") (name, "en") + void $ triple page (dbpprop .:. "birthDate") birthDate + return query + +{- Runs a SELECT query for a single variable on DBpedia, returning the first +possible match. -} +askDBpedia :: Query SelectQuery -> IO (Maybe BindingValue) +askDBpedia q = do + result <- selectQuery "http://dbpedia.org/sparql" q + return $ case result of + Just ([x]:_) -> Just x + Just ((_:_):_) -> error "got more than one bound variable" + _ -> Nothing + +-- Parses an RDF literal as a date. +parseAsDate :: TimeLocale -> RDF.Node -> Maybe Time.Day +parseAsDate locale (RDF.LNode node) = + let value = + case node of + RDF.PlainL v -> v + RDF.PlainLL v _lang -> v + RDF.TypedL v _type -> v + in parseXMLSchemaDate locale $ Text.unpack value +parseAsDate _ _ = Nothing + +{- Parses a date somewhat as described in the XML Schema +<http://www.w3.org/TR/xmlschema-2/#date>. TODO: Handle large (>12-hour) time +zone offsets correctly. TODO: Handle BCE (negative) years correctly. -} +parseXMLSchemaDate :: TimeLocale -> String -> Maybe Time.Day +parseXMLSchemaDate locale dateString = + let expectedFormat = + if length dateString > length "YYYY-MM-DD" + then "%F%z" -- There's a time zone. + else "%F" + in Time.parseTime locale expectedFormat dateString @@ -0,0 +1,27 @@ + ageOf architecture + +ageOf determines somebody's age by querying one or more sources on the +Internet. Since there are hundreds of different sites that catalogue the ages +of famous (and not-so-famous) people, ageOf uses a plugin-based architecture. +Each source gets its own plugin, and then ageOf queries each source in turn. +The first source that gives back an age wins. + +The Haskell idiom to do a plugin-based architecture is to define a plugin data +type, and that's what I've done here. The 'RequestMethod' type represents a +plugin--a single function that takes the name of a person and returns +(depending on which constructor you use) his/her age or date of birth. To +define a new plugin, you thus need to create a new module which exports a +'RequestMethod' type. + +There are currently two plugins packaged with ageOf (though that may change in +the future). One is a sample plugin--it knows when Simon Peyton Jones (the +author of Haskell) was born, and that's it; use it as a skeleton for writing +your own plugins. The second plugin is a real, nontrivial plugin that uses +DBpedia (the Semantic Web mirror of Wikipedia) to determine the age of anybody +whose age is stored on Wikipedia. + + +Local Variables: +mode: text +fill-column: 79 +End: @@ -0,0 +1,675 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + <program> Copyright (C) <year> <name of author> + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<http://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<http://www.gnu.org/philosophy/why-not-lgpl.html>. + @@ -0,0 +1,58 @@ +{- Main.hs -- main entry point +Copyright (C) 2012 Benjamin Barenblat <benjamin@barenblat.name> + +This module is a part of ageOf. + +ageOf is free software: you can redistribute it and/or modify it under the +terms of the GNU General Public License as published by the Free Software +Foundation, either version 3 of the License, or (at your option) any later +version. + +ageOf is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A +PARTICULAR PURPOSE. See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along with +ageOf. If not, see <http://www.gnu.org/licenses/>. -} + +module Main where + +import Control.Monad (foldM) +import System.Environment (getArgs, getProgName) +import System.Exit (ExitCode(..), exitWith) +import Text.Printf (printf) + +import RequestMethod (RequestMethod, getAge) +import DBpedia (dbpedia) +import SamplePlugin (samplePlugin) + +-- The plugins we're going to query, in order of preference. +plugins :: [RequestMethod] +plugins = [ samplePlugin + , dbpedia ] + +main :: IO () +main = getArgs >>= go >>= exitWith + +go :: [String] -> IO ExitCode +go (name : []) = do + age <- getAgeWith plugins name + case age of + Nothing -> return $ ExitFailure 1 + Just n -> print n >> return ExitSuccess +go _ = usage >> return (ExitFailure 1) + +{- The workhorse function. Given a list of 'RequestMethod's, 'getAgeWith' +tries to look up 'name' in each one. As soon as a match succeeds, it returns +the age. -} +getAgeWith :: [RequestMethod] -> String -> IO (Maybe Integer) +getAgeWith methods name = + foldM maybeTryNextMethod Nothing methods + where maybeTryNextMethod :: Maybe Integer -> RequestMethod -> IO (Maybe Integer) + maybeTryNextMethod v@(Just _) _ = return v + maybeTryNextMethod Nothing method = getAge method name + +usage :: IO () +usage = do + programName <- getProgName + printf "usage: %s <name>\n" programName diff --git a/RequestMethod.hs b/RequestMethod.hs new file mode 100644 index 0000000..0828b13 --- /dev/null +++ b/RequestMethod.hs @@ -0,0 +1,42 @@ +{- RequestMethod.hs -- how to request somebody's age off the Internet +Copyright (C) 2012 Benjamin Barenblat <benjamin@barenblat.name> + +This module is a part of ageOf. + +ageOf is free software: you can redistribute it and/or modify it under the +terms of the GNU General Public License as published by the Free Software +Foundation, either version 3 of the License, or (at your option) any later +version. + +ageOf is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A +PARTICULAR PURPOSE. See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along with +ageOf. If not, see <http://www.gnu.org/licenses/>. -} + +module RequestMethod ( RequestMethod(..) + , getAge + ) where + +import Control.Applicative ((<$>)) +import Data.Time + +data RequestMethod = AgeFunction (String -> IO (Maybe Integer)) + | BirthDateFunction (String -> IO (Maybe Day)) + +getAge :: RequestMethod -> String -> IO (Maybe Integer) +getAge (AgeFunction f) name = f name +getAge (BirthDateFunction f) name = do + today <- localDay <$> zonedTimeToLocalTime <$> getZonedTime + maybeDate <- f name + return $ diffYears today <$> maybeDate + +diffYears :: Day -> Day -> Integer +new `diffYears` old = + let (oldYear, _, _) = toGregorian old + (newYear, _, _) = toGregorian new in + let yearsDelta = newYear - oldYear in + if addGregorianYearsRollOver yearsDelta old > new + then yearsDelta - 1 + else yearsDelta diff --git a/SamplePlugin.hs b/SamplePlugin.hs new file mode 100644 index 0000000..3a795a8 --- /dev/null +++ b/SamplePlugin.hs @@ -0,0 +1,30 @@ +{- SamplePlugin.hs -- a sample request plugin +Copyright (C) 2012 Benjamin Barenblat <benjamin@barenblat.name> + +This module is a part of ageOf. + +ageOf is free software: you can redistribute it and/or modify it under the +terms of the GNU General Public License as published by the Free Software +Foundation, either version 3 of the License, or (at your option) any later +version. + +ageOf is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A +PARTICULAR PURPOSE. See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along with +ageOf. If not, see <http://www.gnu.org/licenses/>. -} + +module SamplePlugin (samplePlugin) where + +import Data.Time (Day, fromGregorian) + +import RequestMethod (RequestMethod(BirthDateFunction)) + +-- The sample plugin, defined by the single function 'getBirthDate'. +samplePlugin :: RequestMethod +samplePlugin = BirthDateFunction getBirthDate + +getBirthDate :: String -> IO (Maybe Day) +getBirthDate "Simon Peyton Jones" = return $ Just $ fromGregorian 1958 1 18 +getBirthDate _ = return Nothing diff --git a/Setup.hs b/Setup.hs new file mode 100644 index 0000000..9a994af --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/ageOf.cabal b/ageOf.cabal new file mode 100644 index 0000000..17382d1 --- /dev/null +++ b/ageOf.cabal @@ -0,0 +1,30 @@ +name: ageOf +version: 0.1.0 +license: GPL-3 +license-file: LICENSE +author: Benjamin Barenblat +maintainer: benjamin@barenblat.name +category: Web +build-type: Simple +cabal-version: >=1.8 + +executable ageOf + main-is: Main.hs + other-modules: DBpedia + , RequestMethod + , SamplePlugin + ghc-options: -Wall + build-depends: base ==4.5.* + , current-locale ==0.* + , hsparql ==0.2.* + , old-locale ==1.* + , rdf4h ==1.1.* + , text ==0.11.* + , time ==1.4.* + + +-- Local Variables: +-- mode: Haskell-Cabal +-- fill-column: 70 +-- indent-tabs-mode: nil +-- End: |