{-# LANGUAGE CPP, DoAndIfThenElse #-}

{- |

Module : ./PGIP/Server.hs

Description : run hets as server

Copyright : (c) Christian Maeder, DFKI GmbH 2010

License : GPLv2 or higher, see LICENSE.txt

Maintainer : Christian.Maeder@dfki.de

Stability : provisional

Portability : non-portable (via imports)

-}

module PGIP.Server (hetsServer) where

#ifdef WARP3

import Control.Exception.Base (SomeException)

#endif

import PGIP.Output.Formatting

import PGIP.Output.Mime

import PGIP.Output.Proof

import PGIP.Output.Translations

import qualified PGIP.Output.Provers as OProvers

import PGIP.Query as Query

import PGIP.Server.WebAssets

import Driver.Options

import Driver.ReadFn

import Driver.Version

import Network.Wai.Handler.Warp

import Network.HTTP.Types

import Codec.Binary.UTF8.String

import Control.Monad.Trans (lift, liftIO)

#ifdef WARP1

import Control.Monad.Trans.Resource

import Data.Conduit.Lazy (lazyConsume)

#endif

import qualified Data.Text as T

import Network.Wai

import Network.Wai.Parse as W

import qualified Data.ByteString.Lazy.Char8 as BS

import qualified Data.ByteString.Char8 as B8

import Static.AnalysisLibrary

import Static.ApplyChanges

import Static.ComputeTheory

import Static.DevGraph

import Static.DGTranslation

import Static.DgUtils

import Static.DotGraph

import Static.FromXml

import Static.GTheory

import Static.History (changeDGH)

import Static.PrintDevGraph

import qualified Static.ToJson as ToJson

import Static.ToXml as ToXml

import Logic.LGToXml

import Syntax.ToXml

import Syntax.Print_AS_Structured

import Interfaces.Command

import Interfaces.CmdAction

import Interfaces.GenericATPState

import Comorphisms.LogicGraph

import Logic.Prover

import Logic.Grothendieck

import Logic.Comorphism

import Logic.Logic

import Proofs.AbstractState as AbsState

import Proofs.ConsistencyCheck

import Text.ParserCombinators.Parsec (parse)

import Text.XML.Light

import Text.XML.Light.Cursor

import Common.AutoProofUtils

import Common.Doc

import Common.DocUtils (pretty, showGlobalDoc, showDoc)

import Common.ExtSign (ExtSign (..))

import Common.GtkGoal

import Common.Json (Json (..), pJson, ppJson)

import Common.LibName

import Common.PrintLaTeX

import Common.Result

import Common.ResultT

import Common.ToXml

import Common.Utils

import Common.XUpdate

import Common.GlobalAnnotations

import Control.Monad

import Control.Exception (throwTo)

import Control.Concurrent (myThreadId, ThreadId)

import qualified Data.IntMap as IntMap

import qualified Data.Map as Map

import qualified Data.Set as Set

import qualified Data.CaseInsensitive as CI

import Data.Char

import Data.IORef

import Data.Function

import Data.List

import Data.Maybe

import Data.Ord

import Data.Graph.Inductive.Graph (lab)

import Data.Time.Clock

import Data.Time.LocalTime

import System.Random

import System.Directory

import System.Exit

import System.FilePath

import System.IO

import System.Posix.Process (getProcessID)

import System.Posix.Signals

data Session = Session

{ sessLibEnv :: LibEnv

, sessLibName :: LibName

, sessPath :: [String]

, sessKey :: Int

, sessStart :: UTCTime

, lastAccess :: UTCTime

, usage :: Int

, sessCleanable :: Bool } deriving (Show)

data UsedAPI = OldWebAPI | RESTfulAPI deriving (Show, Eq, Ord)

type SessMap = Map.Map [String] Session

type Cache = IORef (IntMap.IntMap Session, SessMap)

randomKey :: IO Int

randomKey = randomRIO (100000000, 999999999)

sessGraph :: DGQuery -> Session -> Maybe (LibName, DGraph)

sessGraph dgQ s =

let le = sessLibEnv s

ln = sessLibName s

in case dgQ of

DGQuery _ (Just path) ->

find (\ (n, _) -> libToFileName n == path)

$ Map.toList le

_ -> fmap (\ dg -> (ln, dg)) $ Map.lookup ln le

getVal :: [QueryPair] -> String -> Maybe String

getVal qs = fromMaybe Nothing . (`lookup` qs)

getIP4 :: String -> [String]

getIP4 = splitOn '.' . takeWhile (\ c -> isDigit c || c == '.')

matchIP4 :: [String] -> [String] -> Bool

matchIP4 ip mask = case mask of

[] -> True

ft : rt -> case ip of

[] -> False -- mask too long or IP too short

d : s -> (null ft || ft == d) && matchIP4 rt s

matchWhite :: [String] -> [[String]] -> Bool

matchWhite ip l = null l || any (matchIP4 ip) l

#ifdef WARP1

type RsrcIO a = ResourceT IO a

#else

type RsrcIO a = IO a

#endif

#ifdef WARP3

type WebResponse = (Response -> IO ResponseReceived) -> IO ResponseReceived

catchException :: SomeException -> Response

catchException e =

mkResponse textC

internalServerError500

("*** Error:\n" ++ show e)

#else

type WebResponse = (Response -> RsrcIO Response) -> RsrcIO Response

#endif

deletePidFileAndExit :: HetcatsOpts -> ThreadId -> ExitCode -> IO ()

deletePidFileAndExit opts threadId exitCode = do

deletePidFile opts

throwTo threadId exitCode

hetsServer :: HetcatsOpts -> IO ()

hetsServer opts = do

tid <- myThreadId

writePidFile opts

installHandler sigINT (Catch $ deletePidFileAndExit opts tid ExitSuccess) Nothing

installHandler sigTERM (Catch $ deletePidFileAndExit opts tid ExitSuccess) Nothing

hetsServer' opts

deletePidFile opts

writePidFile :: HetcatsOpts -> IO ()

writePidFile opts =

let pidFilePath = pidFile opts

v = verbose opts

in (unless (null pidFilePath) $

do unless (null pidFilePath)

(verbMsgIOLn v 2 ("Writing PIDfile " ++ show pidFilePath))

pid <- getProcessID

writeFile pidFilePath (show pid))

deletePidFile :: HetcatsOpts -> IO ()

deletePidFile opts =

let pidFilePath = pidFile opts

in (unless (null pidFilePath) $ removeFile $ pidFile opts)

hetsServer' :: HetcatsOpts -> IO ()

hetsServer' opts1 = do

tempDir <- getTemporaryDirectory

let tempLib = tempDir </> "MyHetsLib"

logFile = tempDir </>

("hets-" ++ show port ++ ".log")

opts = opts1 { libdirs = tempLib : libdirs opts1 }

port1 = listen opts1

port = if port1 < 0 then 8000 else port1

wl = whitelist opts1

bl = blacklist opts1

prList ll = intercalate ", " $ map (intercalate ".") ll

createDirectoryIfMissing False tempLib

writeFile logFile ""

unless (null wl) . appendFile logFile

$ "white list: " ++ prList wl ++ "\n"

unless (null bl) . appendFile logFile

$ "black list: " ++ prList bl ++ "\n"

sessRef <- newIORef (IntMap.empty, Map.empty)

putIfVerbose opts 1 $ "hets server is listening on port " ++ show port

putIfVerbose opts 2 $ "for more information look into file: " ++ logFile

#ifdef WARP3

runSettings (setOnExceptionResponse catchException $

setPort port $

setTimeout 86400 defaultSettings)

$ \ re respond -> do

#else

run port $ \ re -> do

let respond = liftIO . return

#endif

let rhost = shows (remoteHost re) "\n"

ip = getIP4 rhost

white = matchWhite ip wl

black = any (matchIP4 ip) bl

splitQuery = map (\ (bs, ms) -> (B8.unpack bs, fmap B8.unpack ms))

$ queryString re

pathBits = map T.unpack $ pathInfo re

meth = B8.unpack (requestMethod re)

query = showPathQuery pathBits splitQuery

liftIO $ do

time <- getCurrentTime

createDirectoryIfMissing False tempLib

(m, _) <- readIORef sessRef

appendFile logFile rhost

unless black $ if white then do

appendFile logFile $ shows time " sessions: "

++ shows (IntMap.size m) "\n"

appendFile logFile $ shows (requestHeaders re) "\n"

unless (null query) $ appendFile logFile $ query ++ "\n"

else appendFile logFile "not white listed\n"

if not white || black then respond $ mkResponse "" status403 ""

-- if path could be a RESTful request, try to parse it

else do

eith <- liftIO $ getArgFlags splitQuery

case eith of

Left err -> queryFail err respond

Right (qr, vs, fs) ->

let eith2 = getSwitches qr

in case eith2 of

Left err -> queryFail err respond

Right (qr2, fs2) ->

let newOpts = foldl makeOpts opts $ fs ++ map snd fs2

in if isRESTful pathBits then do

requestBodyParams <- parseRequestParams re

let unknown = filter (`notElem` allQueryKeys) $ map fst qr2

if null unknown

then parseRESTful newOpts sessRef pathBits

(map fst fs2 ++ map (\ (a, b) -> a ++ "=" ++ b) vs)

qr2 requestBodyParams meth respond

else queryFail ("unknown query key(s): " ++ show unknown) respond

-- only otherwise stick to the old response methods

else oldWebApi newOpts tempLib sessRef re pathBits qr2

meth respond

parseRequestParams :: Request -> RsrcIO Json

parseRequestParams request =

let

noParams :: Json

noParams = JNull

parseJson :: String -> Maybe Json

parseJson s = case parse pJson "" s of

Left _ -> Nothing

Right json -> Just json

lookupHeader :: String -> Maybe String

lookupHeader s =

liftM B8.unpack $ lookup (CI.mk $ B8.pack s) $ requestHeaders request

formParams :: RsrcIO (Maybe Json)

formParams =

let toJsonObject :: [(B8.ByteString, B8.ByteString)] -> String

toJsonObject assocList = "{"

++ intercalate ", " (map (\ (k, v) ->

show k ++ ": " ++ jsonStringOrArray v) assocList)

++ "}"

jsonStringOrArray str =

if B8.head str == '[' then B8.unpack str else show str

in do

(formDataB8, _) <- parseRequestBody lbsBackEnd request

return $ parseJson $ toJsonObject formDataB8

jsonBody :: RsrcIO (Maybe Json)

jsonBody = liftM (parseJson . B8.unpack) receivedRequestBody

receivedRequestBody :: RsrcIO B8.ByteString

receivedRequestBody = liftM (B8.pack . BS.unpack) $ lazyRequestBody request

#ifdef WARP1

lazyRequestBody :: Request -> ResourceT IO BS.ByteString

lazyRequestBody = fmap BS.fromChunks . lazyConsume . requestBody

#endif

in

liftM (fromMaybe noParams) $ case lookupHeader "Content-Type" of

Just "application/json" -> jsonBody

Just "multipart/form-data" -> formParams

_ -> formParams

-- | the old API that supports downloading files and interactive stuff

oldWebApi :: HetcatsOpts -> FilePath -> Cache -> Request -> [String]

-> [QueryPair] -> String -> WebResponse

oldWebApi opts tempLib sessRef re pathBits splitQuery meth respond

= case meth of

"GET" -> if isJust $ lookup "menus" splitQuery

then mkMenuResponse respond else do

let path = intercalate "/" pathBits

dirs@(_ : cs) <- liftIO $ getHetsLibContent opts path splitQuery

if not (null cs) || null path then htmlResponse path dirs respond

-- AUTOMATIC PROOFS (parsing)

else if isJust $ getVal splitQuery "autoproof" then

let qr k = Query (DGQuery k Nothing) $

anaAutoProofQuery splitQuery in do

Result ds ms <- liftIO $ runResultT

$ case readMaybe $ head pathBits of

Nothing -> fail "cannot read session id for automatic proofs"

Just k' -> getHetsResult opts [] sessRef (qr k')

Nothing OldWebAPI proofFormatterOptions

respond $ case ms of

Nothing -> mkResponse textC status422 $ showRelDiags 1 ds

Just (t, s) -> mkOkResponse t s

-- AUTOMATIC PROOFS E.N.D.

else getHetsResponse opts [] sessRef pathBits splitQuery respond

"POST" -> do

(params, files) <- parseRequestBody lbsBackEnd re

mTmpFile <- case lookup "content"

$ map (\ (a, b) -> (B8.unpack a, b)) params of

Nothing -> return Nothing

Just areatext -> let content = B8.unpack areatext in

if all isSpace content then return Nothing else liftIO $ do

tmpFile <- getTempFile content "temp.het"

return $ Just tmpFile

let res tmpFile =

getHetsResponse opts [] sessRef [tmpFile] splitQuery respond

mRes = maybe (queryFail "nothing submitted" respond)

res mTmpFile

case files of

[] -> if isJust $ getVal splitQuery "prove" then

getHetsResponse opts [] sessRef pathBits

(splitQuery ++ map (\ (a, b)

-> (B8.unpack a, Just $ B8.unpack b)) params) respond

else mRes

[(_, f)] | isNothing $ lookup updateS splitQuery -> do

let fn = takeFileName $ B8.unpack $ fileName f

if any isAlphaNum fn then do

let tmpFile = tempLib </> fn

liftIO $ BS.writeFile tmpFile $ fileContent f

maybe (res tmpFile) res mTmpFile

else mRes

_ -> getHetsResponse

opts (map snd files) sessRef pathBits splitQuery respond

_ -> respond $ mkResponse "" status400 ""

-- extract what we need to know from an autoproof request

anaAutoProofQuery :: [QueryPair] -> QueryKind

anaAutoProofQuery splitQuery = let

lookup2 = getVal splitQuery

prover = lookup2 "prover"

trans = lookup2 "translation"

timeout = lookup2 "timeout" >>= readMaybe

include = maybe False (== "on") $ lookup2 "includetheorems"

nodeSel = filter (/= "includetheorems")

$ map fst $ filter ((== Just "on") . snd) splitQuery

axioms = mSplitOnComma $ lookup2 "axioms"

prOrCons = case lookup2 "autoproof" of

Just "proof" -> GlProofs

Just "cons" -> GlConsistency

err -> error $ "illegal autoproof method: " ++ show err

in GlAutoProve $

ProveCmd prOrCons include prover trans timeout nodeSel False axioms

-- quick approach to whether or not the query can be a RESTful request

isRESTful :: [String] -> Bool

isRESTful pathBits = case pathBits of

[] -> False

[h] | elem h ["numeric-version", "version", "robots.txt"] -> True

h : _ -> elem h listRESTfulIdentifiers

listRESTfulIdentifiers :: [String]

listRESTfulIdentifiers =

[ "libraries", "sessions", "menus", "filetype", "hets-lib", "dir"]

++ nodeEdgeIdes ++ newRESTIdes

++ ["available-provers"]

nodeEdgeIdes :: [String]

nodeEdgeIdes = ["nodes", "edges"]

newRESTIdes :: [String]

newRESTIdes =

[ "dg", "translations", "provers", "consistency-checkers", "prove"

, "consistency-check", "theory" ]

queryFail :: String -> WebResponse

queryFail msg respond = respond $ mkResponse textC status400 msg

allQueryKeys :: [String]

allQueryKeys = [updateS, "library", "consistency-checker"]

++ globalCommands ++ knownQueryKeys

data RequestBodyParam = Single String | List [String]

-- query is analysed and processed in accordance with RESTful interface

parseRESTful :: HetcatsOpts -> Cache -> [String] -> [String] -> [QueryPair]

-> Json -> String -> WebResponse

parseRESTful

opts sessRef pathBits qOpts splitQuery requestBodyParams meth respond = let

{- some parameters from the paths query part might be needed more than once

(when using lookup upon querybits, you need to unpack Maybe twice) -}

lookupQueryStringParam :: String -> Maybe String

lookupQueryStringParam = getVal splitQuery

lookupBodyParam :: String -> Json -> Maybe RequestBodyParam

lookupBodyParam key json = case json of

JObject pairs -> case lookup key pairs of

Just (JArray a) -> Just $ List $ map (read . ppJson) a

Just v -> Just $ Single $ read $ ppJson v

_ -> Nothing

_ -> Nothing

lookupSingleParam :: String -> Maybe String

lookupSingleParam key = case meth of

"GET" -> lookupQueryStringParam key

_ -> case lookupBodyParam key requestBodyParams of

Just (Single s) -> Just s

_ -> Nothing

lookupListParam :: String -> [String]

lookupListParam key = case meth of

"GET" -> mSplitOnComma $ lookupQueryStringParam key

_ -> case lookupBodyParam key requestBodyParams of

Just (List ps) -> ps

_ -> []

isParamTrue :: Bool -> String -> Bool

isParamTrue def key = case fmap (map toLower) $ lookupSingleParam key of

Nothing -> def

Just "true" -> True

_ -> False

session = lookupSingleParam "session" >>= readMaybe

library = lookupSingleParam "library"

format = lookupSingleParam "format"

nodeM = lookupSingleParam "node"

includeDetails = isParamTrue True "includeDetails"

includeProof = isParamTrue True "includeProof"

theorems = lookupListParam "theorems"

transM = lookupSingleParam "translation"

proverM = lookupSingleParam "prover"

consM = lookupSingleParam "consistency-checker"

inclM = lookupSingleParam "include"

axioms = lookupListParam "axioms"

incl = maybe False (\ s ->

notElem (map toLower s) ["f", "false"]) inclM

timeout = lookupSingleParam "timeout" >>= readMaybe

queryFailure = queryFail

("this query does not comply with RESTful interface: "

++ showPathQuery pathBits splitQuery) respond

-- since used more often, generate full query out of nodeIRI and nodeCmd

nodeQuery s = NodeQuery $ maybe (Right s) Left (readMaybe s :: Maybe Int)

pfOptions = proofFormatterOptions

{ pfoIncludeProof = includeProof

, pfoIncludeDetails = includeDetails

}

parseNodeQuery :: Monad m => String -> Int -> m NodeCommand -> m Query.Query

parseNodeQuery p sId ncmd = ncmd >>= let

in return . Query (DGQuery sId (Just p)) . nodeQuery (getFragment p)

-- call getHetsResult with the properly generated query (Final Result)

getResponseAux myOpts qr = do

let format' = Just $ fromMaybe "xml" format

Result ds ms <- liftIO $ runResultT $

getHetsResult myOpts [] sessRef qr format' RESTfulAPI pfOptions

respond $ case ms of

Nothing -> mkResponse textC status422 $ showRelDiags 1 ds

Just (t, s) -> mkOkResponse t s

getResponse = getResponseAux opts

-- respond depending on request Method

in case meth of

rm | elem rm ["GET", "POST"] -> case pathBits of

["robots.txt"] -> respond $ mkOkResponse textC

$ unlines ["User-agent: *", "Disallow: /"]

-- show all menu options

["menus"] -> mkMenuResponse respond

-- list files from directory

"dir" : r -> do

let path' = intercalate "/" r

dirs <- liftIO $ getHetsLibContent opts path' splitQuery

htmlResponse path' dirs respond

["version"] -> respond $ mkOkResponse textC hetsVersion

["numeric-version"] ->

respond $ mkOkResponse textC hetsVersionNumeric

["available-provers"] ->

liftIO (usableProvers logicGraph)

>>= respond . mkOkResponse xmlC . ppTopElement

-- get dgraph from file

"filetype" : libIri : _ -> mkFiletypeResponse opts libIri respond

"hets-lib" : r -> let file = intercalate "/" r in

getResponse $ Query (NewDGQuery file []) $ DisplayQuery format

-- get library (complies with get/hets-lib for now)

["libraries", libIri, "development_graph"] ->

getResponse $ Query (NewDGQuery libIri []) $ DisplayQuery format

-- get previously created session

"sessions" : sessId : cmd -> case readMaybe sessId of

Nothing -> queryFail ("failed to read session number from " ++ sessId)

respond

Just sId ->

(case nodeM of

Just ndIri -> parseNodeQuery ndIri sId $ case cmd of

["provers"] -> return $ NcProvers GlProofs transM

["translations"] -> return $ NcTranslations Nothing

_ -> fail $ "unknown node command for a GET-request: "

++ intercalate "/" cmd

Nothing -> fmap (Query (DGQuery sId Nothing)) $ case cmd of

[] -> return $ DisplayQuery format

["provers"] -> return $ GlProvers GlProofs transM

["translations"] -> return GlTranslations

_ -> fail $ "unknown global command for a GET-request: "

++ intercalate "/" cmd) >>= getResponse

-- get node or edge view

nodeOrEdge : p : c | elem nodeOrEdge nodeEdgeIdes -> let

iriPath = takeWhile (/= '#') p

dgQ = maybe (NewDGQuery (fromMaybe iriPath library) [])

(`DGQuery` library) session

f = getFragment p

in case elemIndex nodeOrEdge nodeEdgeIdes of

Just 0 -> let

i = maybe (Right f) Left $ readMaybe f in

getResponse $ Query dgQ $ NodeQuery i $ case c of

["theory"] -> NcCmd Query.Theory

_ -> NcCmd Query.Info

Just 1 -> case readMaybe f of

Just i -> getResponse $ Query dgQ $ EdgeQuery i "edge"

Nothing -> queryFail ("failed to read edgeId from " ++ f) respond

_ -> error $ "PGIP.Server.elemIndex " ++ nodeOrEdge

newIde : libIri : rest ->

let cmdOptList = filter (/= "") rest

(optFlags, cmdList) = partition (`elem` map fst optionFlags)

cmdOptList

newOpts = foldl makeOpts opts $ mapMaybe (`lookup` optionFlags)

optFlags

in if elem newIde newRESTIdes && all (`elem` globalCommands) cmdList

then let

qkind = case newIde of

"translations" -> case nodeM of

Nothing -> GlTranslations

Just n -> nodeQuery n $ NcTranslations Nothing

_ | elem newIde ["provers", "consistency-checkers"] ->

let pm = if newIde == "provers" then GlProofs else GlConsistency

in case nodeM of

Nothing -> GlProvers pm transM

Just n -> nodeQuery n $ NcProvers pm transM

_ | elem newIde ["prove", "consistency-check"] ->

let isProve = newIde == "prove"

pm = if isProve then GlProofs else GlConsistency

pc = ProveCmd pm

(not (isProve && isJust inclM) || incl)

(if isProve then proverM else consM)

transM timeout theorems True axioms

in case nodeM of

Nothing -> GlAutoProve pc

Just n -> nodeQuery n $ ProveNode pc

"dg" -> case transM of

Nothing -> DisplayQuery (Just $ fromMaybe "xml" format)

Just tr -> Query.DGTranslation tr

"theory" -> case transM of

Nothing -> case nodeM of

Just x -> NodeQuery (maybe (Right x) Left $ readMaybe x)

$ NcCmd Query.Theory

Nothing -> error "REST: theory"

Just tr -> case nodeM of

Just x -> NodeQuery (maybe (Right x) Left $ readMaybe x)

$ NcCmd $ Query.Translate tr

Nothing -> error "REST: theory"

_ -> error $ "REST: unknown " ++ newIde

in getResponseAux newOpts . Query (NewDGQuery libIri $ cmdList

++ Set.toList (Set.fromList $ optFlags ++ qOpts)) $ qkind

else queryFailure

_ -> queryFailure

"PUT" -> case pathBits of

{- execute global commands

TODO load other library ??? -}

["libraries", libIri, "proofs", prId, cmd] ->

case readMaybe prId of

Nothing -> queryFail ("failed to read sessionId from " ++ prId)

respond

Just sessId -> let

dgQ = DGQuery sessId $ Just libIri in

getResponse $ Query dgQ $ GlobCmdQuery cmd

-- execute a proof or calculus request

["sessions", sessId, cmd] -> case readMaybe sessId of

Nothing -> queryFail ("failed to read sessionId from " ++ sessId)

respond

Just sId -> case cmd of

"prove" ->

let pc = ProveCmd GlProofs incl proverM transM timeout [] False

axioms

in case nodeM of

-- prove all nodes if no singleton is selected

Nothing -> return $ Query (DGQuery sId Nothing)

$ GlAutoProve pc

-- otherwise run prover for single node only

Just ndIri -> parseNodeQuery ndIri sId $ return

$ ProveNode pc

>>= getResponse

-- on other cmd look for (optional) specification of node or edge

_ -> case (nodeM, lookupSingleParam "edge") of

-- fail if both are specified

(Just _, Just _) ->

fail "please specify only either node or edge"

-- call command upon a single node

(Just ndIri, Nothing) -> parseNodeQuery ndIri sId

$ case lookup cmd $ map (\ a -> (showNodeCmd a, a)) nodeCmds of

Just nc -> return $ NcCmd nc

_ -> fail $ "unknown node command '" ++ cmd ++ "' "

-- call (the only) command upon a single edge

(Nothing, Just edIri) -> case readMaybe $ getFragOfCode edIri of

Just i -> return $ Query (DGQuery sId Nothing)

$ EdgeQuery i "edge"

Nothing ->

fail $ "failed to read edgeId from edgeIRI: " ++ edIri

-- call of global command

_ -> return $ Query (DGQuery sId Nothing) $ GlobCmdQuery cmd

>>= getResponse

-- fail if request doesn't comply

_ -> queryFailure

{- create failure response if request method is not known

(should never happen) -}

_ -> respond $ mkResponse "" status400 ""

mSplitOnComma :: Maybe String -> [String]

mSplitOnComma mstr = case mstr of

Nothing -> []

Just str -> splitOn ',' str

mkMenuResponse :: WebResponse

mkMenuResponse respond =

respond $ mkOkResponse xmlC $ ppTopElement $ unode "menus" mkMenus

mkMenus :: [Element]

mkMenus = menuTriple "" "Get menu triples" "menus"

: menuTriple "/DGraph" updateS updateS

: map (\ (c, _) -> menuTriple "/" (menuTextGlobCmd c) $ cmdlGlobCmd c)

allGlobLibAct

++ map (\ nc -> menuTriple "/DGraph/DGNode" ("Show " ++ nc) nc) nodeCommands

++ [menuTriple "/DGraph/DGLink" "Show edge info" "edge"]

status422 :: Status

status422 = Status 422 $ B8.pack "Unprocessable Entity"

mkFiletypeResponse :: HetcatsOpts -> String -> WebResponse

mkFiletypeResponse opts libIri respond = do

res <- liftIO $ getContentAndFileType opts libIri

respond $ case res of

Left err -> mkResponse textC status422 err

Right (mr, _, fn, _) -> case mr of

Nothing -> mkResponse textC status422 $ fn ++ ": unknown file type"

Just r -> mkOkResponse textC $ fn ++ ": " ++ r

menuTriple :: String -> String -> String -> Element

menuTriple q d c = unode "triple"

[ unode "xquery" q

, unode "displayname" d

, unode "command" c ]

htmlResponse :: FilePath -> [Element] -> WebResponse

htmlResponse path listElements respond = respond . mkOkResponse htmlC

$ htmlPageWithTopContent path listElements

htmlPageWithTopContent :: FilePath -> [Element] -> String

htmlPageWithTopContent path listElements = htmlPage

("Listing of" ++ if null path then " repository" else ": " ++ path)

[]

(unode "h1" hetsVersion : unode "p"

[ bold "Hompage:"

, aRef "http://hets.eu" "hets.eu"

, bold "Contact:"

, aRef "mailto:hets-devel@informatik.uni-bremen.de"

"hets-devel@informatik.uni-bremen.de" ]

: headElems path ++ [unode "ul" listElements])

htmlPage :: String -> String -> [Element] -> String

htmlPage title javascripts body = htmlHead title javascripts

++ intercalate "\n" (map ppElement body)

++ htmlFoot

htmlHead :: String -> String -> String

htmlHead title javascript =

"<!DOCTYPE html>\n"

++ "<html lang=\"en\">\n"

++ " <head>\n"

++ " <meta charset=\"utf-8\">\n"

++ " <meta content=\"width=device-width,initial-scale=1,shrink-to-fit=no\" name=\"viewport\">\n"

++ " <meta content=\"#000000\" name=\"theme-color\">\n"

++ " <meta name=\"robots\" content=\"noindex,nofollow\">\n"

++ " <title>DOLIator - " ++ title ++ "</title>\n"

++ " <!-- Semantic UI stylesheet -->\n"

++ " <style type=\"text/css\">\n"

++ semanticUiCss ++ "\n"

++ " </style>\n"

++ " <!-- Hets stylesheet -->\n"

++ " <style type=\"text/css\">\n"

++ hetsCss ++ "\n"

++ " </style>\n"

++ " </head>\n"

++ " <body>\n"

++ " <!-- jQuery -->\n"

++ " <script type=\"text/javascript\">\n"

++ jQueryJs ++ "\n"

++ " </script>\n"

++ " <!-- Semantic UI Javascript -->\n"

++ " <script type=\"text/javascript\">\n"

++ semanticUiJs ++ "\n"

++ " </script>\n"

++ " <!-- Hets Javascript -->\n"

++ " <script type=\"text/javascript\">\n"

++ javascript ++ "\n"

++ " </script>\n"

htmlFoot :: String

htmlFoot =

" </body>\n"

++ "</html>\n"

mkResponse :: String -> Status -> String -> Response

mkResponse ty st = responseLBS st

(if null ty then [] else

#ifdef HTTPTYPES

[headerContentType $ B8.pack ty]

#else

[(hContentType, B8.pack ty)]

#endif

) . BS.pack . encodeString

mkOkResponse :: String -> String -> Response

mkOkResponse ty = mkResponse ty status200

addSess :: Cache -> Session -> IO Int

addSess sessRef s = do

let k = sessKey s

atomicModifyIORef sessRef $ \ (m, lm) ->

((IntMap.insert k s m, Map.insert (sessPath s) s lm), k)

cleanUpCache :: Cache -> IO ()

cleanUpCache sessRef = do

let mSize = 60

time <- getCurrentTime

atomicModifyIORef sessRef $ \ (m, lm) ->

if Map.size lm < mSize then ((m, lm), ()) else

let ss = cleanUpSessions time mSize m

in ((IntMap.fromList $ map (\ s -> (sessKey s, s)) ss

, Map.fromList $ map (\ s -> (sessPath s, s)) ss), ())

where

cleanUpSessions :: UTCTime -> Int -> IntMap.IntMap Session -> [Session]

cleanUpSessions time maxSize =

unifySessionLists . dropCleanables . sessionCleanableLists

where

sessionSort :: [Session] -> [Session]

sessionSort = sortBy (cmpSess time)

sessionCleanableLists :: IntMap.IntMap Session -> ([Session], [Session])

sessionCleanableLists =

partition sessCleanable . sessionSort . IntMap.elems

dropCleanables :: ([Session], [Session]) -> ([Session], [Session])

dropCleanables (cleanables, uncleanables) =

(drop (maxSize `div` 2) cleanables, uncleanables)

unifySessionLists :: ([Session], [Session]) -> [Session]

unifySessionLists = sessionSort . uncurry (++)

cmpSess :: UTCTime -> Session -> Session -> Ordering

cmpSess curTime =

let f s = let

l = lastAccess s

b = sessStart s

d2 = utctDay curTime

s2 = utctDayTime curTime

d1 = utctDay l

s1 = utctDayTime l

u = usage s

in if u <= 1 && d1 == d2 && s2 > secondsToDiffTime 3600 + s1

then (u + 100, diffUTCTime l curTime)

else (u, diffUTCTime b l)

in on compare f

addNewSess :: Cache -> Session -> IO Int

addNewSess sessRef sess = do

cleanUpCache sessRef

k <- randomKey

let s = sess { sessKey = k }

addSess sessRef s

nextSess :: LibEnv -> Session -> Cache -> Int -> IO Session

nextSess newLib =

modifySessionAndCache "nextSess" (\ s -> s { sessLibEnv = newLib })

makeSessCleanable :: Session -> Cache -> Int -> IO Session

makeSessCleanable =

modifySessionAndCache "makeSessCleanable" (\ s -> s { sessCleanable = True })

modifySessionAndCache :: String -> (Session -> Session) -> Session -> Cache

-> Int -> IO Session

modifySessionAndCache errorMessage f sess sessRef k =

if k <= 0 then return sess else

atomicModifyIORef sessRef

(\ (m, lm) -> case IntMap.lookup k m of

Nothing -> error errorMessage

Just s -> let newSess = f s

in ((IntMap.insert k newSess m, lm), newSess))

ppDGraph :: DGraph -> Maybe PrettyType -> ResultT IO (String, String)

ppDGraph dg mt = let ga = globalAnnos dg in case optLibDefn dg of

Nothing -> fail "parsed LIB-DEFN not avaible"

Just ld ->

let d = prettyLG logicGraph ld

latex = renderLatex Nothing $ toLatex ga d

in case mt of

Just pty -> case pty of

PrettyXml -> return

(xmlC, ppTopElement $ xmlLibDefn logicGraph ga ld)

PrettyAscii _ -> return (textC, renderText ga d ++ "\n")

PrettyHtml -> return (htmlC, renderHtml ga d)

PrettyLatex _ -> return ("application/latex", latex)

Nothing -> lift $ do

tmpDir <- getTemporaryDirectory

tmpFile <- writeTempFile (latexHeader ++ latex ++ latexFooter)

tmpDir "temp.tex"

mapM_ (\ s -> do

let sty = (</> "hetcasl.sty")

f = sty s

ex <- doesFileExist f

when ex $ copyFile f $ sty tmpDir)

[ "utils", "Hets/utils"

, "/home/www.informatik.uni-bremen.de/cofi/hets-tmp" ]

withinDirectory tmpDir $ do

(ex1, out1, err1) <- executeProcess "pdflatex" [tmpFile] ""

(ex2, out2, err2) <- executeProcess "pdflatex" [tmpFile] ""

let pdfFile = replaceExtension tmpFile "pdf"

pdf <- doesFileExist pdfFile

if ex1 == ExitSuccess && ex2 == ExitSuccess && pdf then do

pdfHdl <- openBinaryFile pdfFile ReadMode

str <- hGetContents pdfHdl

when (length str < 0) $ putStrLn "pdf file too large"

hClose pdfHdl

return (pdfC, str)

else return (textC, "could not create pdf:\n"

++ unlines [out1, err1, out2, err2])

increaseUsage :: Cache -> Session -> ResultT IO (Session, Int)

increaseUsage sessRef sess = do

time <- lift getCurrentTime

let s2 = sess { usage = usage sess + 1, lastAccess = time }

k <- lift $ addSess sessRef s2

return (s2, k)

getDGraph :: HetcatsOpts -> Cache -> DGQuery

-> ResultT IO (Session, Int)

getDGraph opts sessRef dgQ = do

(m, lm) <- lift $ readIORef sessRef

case dgQ of

NewDGQuery file cmdList -> do

let cl = mapMaybe (\ s -> find ((== s) . cmdlGlobCmd)

$ map fst allGlobLibAct) cmdList

mf <- lift $ getContentAndFileType opts file

case mf of

Left err -> fail err

Right (_, mh, f, cont) -> case mh of

Nothing -> fail $ "could determine checksum for: " ++ file

Just h -> let q = file : h : cmdList in

case Map.lookup q lm of

Just sess -> increaseUsage sessRef sess

Nothing -> do

(ln, le1) <- if isDgXmlFile opts f cont

then readDGXmlR opts f Map.empty

else anaSourceFile logicGraph opts

{ outputToStdout = False }

Set.empty emptyLibEnv emptyDG file

le2 <- foldM (\ e c -> liftR

$ fromJust (lookup c allGlobLibAct) ln e) le1 cl

time <- lift getCurrentTime

let sess = Session

{ sessLibEnv = le2

, sessLibName = ln

, sessPath = q

, sessKey = 0 -- to be updated by addNewSess

, sessStart = time

, lastAccess = time

, usage = 1

, sessCleanable = False }

k <- lift $ addNewSess sessRef sess

return (sess, k)

DGQuery k _ -> case IntMap.lookup k m of

Nothing -> fail "unknown development graph"

Just sess -> increaseUsage sessRef sess

getSVG :: String -> String -> DGraph -> ResultT IO String

getSVG title url dg = do

(exCode, out, err) <- lift $ executeProcess "dot" ["-Tsvg"]

$ dotGraph title False url dg

case exCode of

ExitSuccess -> liftR $ extractSVG dg out

_ -> fail err

enrichSVG :: DGraph -> Element -> Element

enrichSVG dg e = processSVG dg $ fromElement e

processSVG :: DGraph -> Cursor -> Element

processSVG dg c = case nextDF c of

Nothing -> case toTree (root c) of

Elem e -> e

_ -> error "processSVG"

Just c2 -> processSVG dg

$ modifyContent (addSVGAttribs dg) c2

nodeAttrib :: DGNodeLab -> String

nodeAttrib l = let nt = getRealDGNodeType l in

(if isRefType nt then "Ref" else "")

++ (if hasSenKind (const True) l then

(if isProvenNode nt then "P" else "Unp") ++ "roven"

++ if isProvenCons nt then "Cons" else ""

else "LocallyEmpty")

++ (if isInternalSpec nt then "Internal" else "")

++ if labelHasHiding l then "HasIngoingHidingLink" else ""

edgeAttrib :: DGLinkLab -> String

edgeAttrib l = show (pretty $ dgl_type l) ++

if dglPending l then "IncompleteProofChain" else ""

addSVGAttribs :: DGraph -> Content -> Content

addSVGAttribs dg c = case c of

Elem e -> case getAttrVal "id" e of

Just istr | isNat istr -> let i = read istr in

case getAttrVal "class" e of

Just "node" -> case lab (dgBody dg) i of

Nothing -> c

Just l -> Elem $ add_attr (mkAttr "type" $ nodeAttrib l) e

Just "edge" -> case getDGLinksById (EdgeId i) dg of

[(_, _, l)] ->

Elem $ add_attr (mkAttr "type" $ edgeAttrib l) e

_ -> c

_ -> c

_ -> c

_ -> c

extractSVG :: DGraph -> String -> Result String

extractSVG dg str = case parseXMLDoc str of

Nothing -> fail "did not recognize svg element"

Just e -> return $ showTopElement $ enrichSVG dg e

cmpFilePath :: FilePath -> FilePath -> Ordering

cmpFilePath f1 f2 = case comparing hasTrailingPathSeparator f2 f1 of

EQ -> compare f1 f2

c -> c

getHetsResponse :: HetcatsOpts -> [W.FileInfo BS.ByteString]

-> Cache -> [String] -> [QueryPair] -> WebResponse

getHetsResponse opts updates sessRef pathBits query respond = do

Result ds ms <- liftIO $ runResultT $ case anaUri pathBits query

$ updateS : globalCommands of

Left err -> fail err

Right q -> getHetsResult opts updates sessRef q Nothing OldWebAPI

proofFormatterOptions

respond $ case ms of

Just (t, s) | not $ hasErrors ds -> mkOkResponse t s

_ -> mkResponse textC status422 $ showRelDiags 1 ds

getHetsResult :: HetcatsOpts -> [W.FileInfo BS.ByteString]

-> Cache -> Query.Query -> Maybe String -> UsedAPI -> ProofFormatterOptions

-> ResultT IO (String, String)

getHetsResult opts updates sessRef (Query dgQ qk) format api pfOptions = do

let getCom n = let ncoms = filter (\(Comorphism cid) -> language_name cid == n) comorphismList

in case ncoms of

[c] -> c

[] -> error $ "comorphism not found:" ++ n

_ -> error $ "more than one comorphism found for:" ++ n

sk@(sess', k) <- getDGraph opts sessRef dgQ

sess <- lift $ makeSessCleanable sess' sessRef k

let libEnv = sessLibEnv sess

(ln, dg) <- maybe (fail "unknown development graph") return

$ sessGraph dgQ sess

let title = libToFileName ln

let svg = getSVG title ('/' : show k) dg

case qk of

DisplayQuery ms -> case format `mplus` ms of

Just "svg" -> fmap (\ s -> (svgC, s)) svg

Just "xml" -> liftR $ return (xmlC, ppTopElement

$ ToXml.dGraph opts libEnv ln dg)

Just "json" -> liftR $ return (jsonC, ppJson

$ ToJson.dGraph opts libEnv ln dg)

Just "dot" -> liftR $ return

(dotC, dotGraph title False title dg)

Just "symbols" -> liftR $ return (xmlC, ppTopElement

$ ToXml.dgSymbols opts dg)

Just "session" -> liftR $ return (htmlC, ppElement

$ aRef (mkPath sess ln k) $ show k)

Just str | elem str ppList

-> ppDGraph dg $ lookup str $ zip ppList prettyList

_ -> sessAns ln svg sk

Query.DGTranslation path -> do

-- compose the comorphisms passed in translation

let coms = map getCom $ splitOn ',' path

com <- foldM compComorphism (head coms) $ tail coms

dg' <- liftR $ dg_translation libEnv dg com

liftR $ return (xmlC, ppTopElement

$ ToXml.dGraph opts libEnv ln dg')

GlProvers mp mt -> do

availableProvers <- liftIO $ getFullProverList mp mt dg

return $ case api of

OldWebAPI -> (xmlC, formatProvers mp $

proversToStringAux availableProvers)

RESTfulAPI -> OProvers.formatProvers format mp availableProvers

GlTranslations -> do

availableComorphisms <- liftIO $ getFullComorphList dg

return $ case api of

OldWebAPI ->

(xmlC, formatComorphs availableComorphisms)

RESTfulAPI ->

formatTranslations format availableComorphisms

GlShowProverWindow prOrCons -> showAutoProofWindow dg k prOrCons

GlAutoProve (ProveCmd prOrCons incl mp mt tl nds xForm axioms) -> do

(newLib, nodesAndProofResults) <-

proveMultiNodes prOrCons libEnv ln dg incl mp mt tl nds axioms

if all (null . snd) nodesAndProofResults

then return (textC, "nothing to prove")

else do

lift $ nextSess newLib sess sessRef k

return $ case api of

OldWebAPI -> let

sens = foldr (\ (dgNodeName, proofResults) res ->

formatResultsAux xForm prOrCons dgNodeName proofResults

: res

) [] nodesAndProofResults

in (htmlC, formatResultsMultiple xForm k sens prOrCons)

RESTfulAPI -> formatProofs

format

pfOptions

nodesAndProofResults

GlobCmdQuery s ->

case find ((s ==) . cmdlGlobCmd . fst) allGlobLibAct of

Nothing -> if s == updateS then

case filter ((== ".xupdate") . takeExtension . B8.unpack

. fileName) updates of

ch : _ -> do

let str = BS.unpack $ fileContent ch

(newLn, newLib) <- dgXUpdate opts str libEnv ln dg

newSess <- lift $ nextSess newLib sess sessRef k

sessAns newLn svg (newSess, k)

[] -> sessAns ln svg sk

else fail "getHetsResult.GlobCmdQuery"

Just (_, act) -> do

newLib <- liftR $ act ln libEnv

newSess <- lift $ nextSess newLib sess sessRef k

-- calculate updated SVG-view from modified development graph

let newSvg = getSVG title ('/' : show k)

$ lookupDGraph ln newLib

sessAns ln newSvg (newSess, k)

NodeQuery ein nc -> do

nl@(i, dgnode) <- case ein of

Right n -> case lookupNodeByName n dg of

p : _ -> return p

[] -> fail $ "no node name: " ++ n

Left i -> case lab (dgBody dg) i of

Nothing -> fail $ "no node id: " ++ show i

Just dgnode -> return (i, dgnode)

let fstLine = (if isDGRef dgnode then ("reference " ++) else

if isInternalNode dgnode then ("internal " ++) else id)

"node " ++ getDGNodeName dgnode ++ " (#" ++ show i ++ ")\n"

ins = getImportNames dg i

showN d = showGlobalDoc (globalAnnos dg) d "\n"

case nc of

NcCmd cmd | elem cmd [Query.Node, Info, Symbols]

-> case cmd of

Symbols -> return (xmlC, ppTopElement

$ showSymbols opts ins (globalAnnos dg) dgnode)

_ -> return (textC, fstLine ++ showN dgnode)

_ -> case maybeResult $ getGlobalTheory dgnode of

Nothing -> fail $

"cannot compute global theory of:\n" ++ fstLine

Just gTh -> let subL = sublogicOfTh gTh in case nc of

ProveNode (ProveCmd pm incl mp mt tl thms xForm axioms) ->

case pm of

GlProofs -> do

(newLib, proofResults) <- proveNode libEnv ln dg nl

gTh subL incl mp mt tl thms axioms

if null proofResults

then return (textC, "nothing to prove")

else do

lift $ nextSess newLib sess sessRef k

return $ case api of

OldWebAPI -> (htmlC,

formatResults xForm k i . unode "results" $

formatGoals True proofResults)

RESTfulAPI -> formatProofs

format

pfOptions

[(getDGNodeName dgnode, proofResults)]

GlConsistency -> do

(newLib, [(_, res, txt, _, _, _)]) <-

consNode libEnv ln dg nl subL incl mp mt tl

lift $ nextSess newLib sess sessRef k

return (xmlC, ppTopElement $ formatConsNode res txt)

_ -> case nc of

NcCmd Query.Theory -> case api of

OldWebAPI -> lift $ fmap (\ t -> (htmlC, t))

$ showGlobalTh dg i gTh k fstLine

RESTfulAPI -> lift $ fmap (\ t -> (xmlC, t))

$ showNodeXml opts (globalAnnos dg) libEnv dg i

NcCmd (Query.Translate x) -> do

-- compose the comorphisms passed in translation

let coms = map getCom $ splitOn ',' x

com <- foldM compComorphism (head coms) $ tail coms

-- translate the theory of i along com

gTh1 <- liftR $ mapG_theory com gTh

-- insert the translation of i in dg

let n1 = getNewNodeDG dg

labN1 = newInfoNodeLab

emptyNodeName

(newNodeInfo DGBasic) -- to be corrected

gTh1

dg1 = insLNodeDG (n1, labN1) dg

gmor <- liftR $ gEmbedComorphism com $ signOf $ dgn_theory dgnode

-- add a link from i to n1 labeled with (com, id)

let (_, dg2) = insLEdgeDG

(i, n1, globDefLink gmor SeeSource) -- origin to be corrected

dg1

-- show the theory of n1 in xml format

lift $ fmap (\ t -> (xmlC, t)) $ showNodeXml opts (globalAnnos dg2) libEnv dg2 n1

NcProvers mp mt -> do

availableProvers <- liftIO $ getProverList mp mt subL

return $ case api of

OldWebAPI -> (xmlC, formatProvers mp $

proversToStringAux availableProvers)

RESTfulAPI ->

OProvers.formatProvers format mp availableProvers

NcTranslations mp -> do

availableComorphisms <- liftIO $ getComorphs mp subL

return $ case api of

OldWebAPI ->

(xmlC, formatComorphs availableComorphisms)

RESTfulAPI ->

formatTranslations format availableComorphisms

_ -> error "getHetsResult.NodeQuery."

EdgeQuery i _ ->

case getDGLinksById (EdgeId i) dg of

[e@(_, _, l)] ->

return (textC, showLEdge e ++ "\n" ++ showDoc l "")

[] -> fail $ "no edge found with id: " ++ show i

_ -> fail $ "multiple edges found with id: " ++ show i

formatGoals :: Bool -> [ProofResult] -> [Element]

formatGoals includeDetails =

map (\ (n, e, d, _, _, mps) -> unode "goal"

([unode "name" n, unode "result" e]

++ [unode "details" d | includeDetails]

++ case mps of

Nothing -> []

Just ps -> formatProofStatus ps))

formatProofStatus :: ProofStatus G_proof_tree -> [Element]

formatProofStatus ps =

[ unode "usedProver" $ usedProver ps

-- `read` makes this type-unsafe

, unode "tacticScript" $ formatTacticScript $ read $

(\ (TacticScript ts) -> ts) $ tacticScript ps

, unode "proofTree" $ show $ proofTree ps

, unode "usedTime" $ formatUsedTime $ usedTime ps

, unode "usedAxioms" $ formatUsedAxioms $ usedAxioms ps

, unode "proverOutput" $ formatProverOutput $ proofLines ps

]

formatProverOutput :: [String] -> CData

formatProverOutput ls =

CData { cdVerbatim = CDataVerbatim

, cdData = unlines ls

, cdLine = Nothing

}

formatTacticScript :: ATPTacticScript -> [Element]

formatTacticScript ts =

[ unode "timeLimit" $ show $ tsTimeLimit ts

, unode "extraOpts" $ map (unode "option") $ tsExtraOpts ts

]

formatUsedTime :: TimeOfDay -> [Element]

formatUsedTime tod =

[ unode "seconds" $ init $ show $ timeOfDayToTime tod

, unode "components"

[ unode "hours" $ show $ todHour tod

, unode "minutes" $ show $ todMin tod

, unode "seconds" $ show $ todSec tod

]

]

formatUsedAxioms :: [String] -> [Element]

formatUsedAxioms = map (unode "axiom")

formatConsNode :: String -> String -> Element

formatConsNode res txt = add_attr (mkAttr "state" res) $ unode "result" txt

formatResultsMultiple :: Bool -> Int -> [Element] -> ProverMode -> String

formatResultsMultiple xForm sessId rs prOrCons =

if xForm then ppTopElement $ unode "Results" rs else let

goBack1 = case prOrCons of

GlConsistency -> aRef ('/' : show sessId ++ "?consistency") "return"

GlProofs -> aRef ('/' : show sessId ++ "?autoproof") "return"

goBack2 = aRef ('/' : show sessId) "return to DGraph"

in ppElement $ unode "html" ( unode "head"

[ unode "title" "Results", add_attr ( mkAttr "type" "text/css" )

$ unode "style" resultStyles, goBack1, plain " ", goBack2 ]

: foldr (\ el r -> unode "h4" (qName $ elName el) : el : r) [] rs )

-- | display results of proving session (single node)

formatResults :: Bool -> Int -> Int -> Element -> String

formatResults xForm sessId i rs =

if xForm || sessId <= 0 then ppTopElement rs else let

goBack1 = aRef ('/' : show sessId ++ "?theory=" ++ show i) "return to Theory"

goBack2 = aRef ('/' : show sessId) "return to DGraph"

in ppElement $ unode "html" [ unode "head"

[ unode "title" "Results", add_attr ( mkAttr "type" "text/css" )

$ unode "style" resultStyles, goBack1, plain " ", goBack2 ], rs ]

resultStyles :: String

resultStyles = unlines

[ "results { margin: 5px; padding:5px; display:block; }"

, "goal { display:block; margin-left:15px; }"

, "name { display:inline; margin:5px; padding:10px; font-weight:bold; }"

, "result { display:inline; padding:30px; }" ]

showBool :: Bool -> String

showBool = map toLower . show

showNodeXml :: HetcatsOpts -> GlobalAnnos -> LibEnv -> DGraph -> Int -> IO String

showNodeXml opts ga lenv dg n = let

lNodeN = lab (dgBody dg) n

in case lNodeN of

Just lNode -> return $ ppTopElement $ ToXml.lnode opts ga lenv (n,lNode)

Nothing -> error $ "no node for " ++ show n

{- | displays the global theory for a node with the option to prove theorems

and select proving options -}

showGlobalTh :: DGraph -> Int -> G_theory -> Int -> String -> IO String

showGlobalTh dg i gTh sessId fstLine = case simplifyTh gTh of

sGTh@(G_theory lid _ (ExtSign sig _) _ thsens _) -> let

ga = globalAnnos dg

-- links to translations and provers xml view

transBt = aRef ('/' : show sessId ++ "?translations=" ++ show i)

"translations"

prvsBt = aRef ('/' : show sessId ++ "?provers=" ++ show i) "provers"

headr = unode "h3" fstLine

thShow = renderHtml ga $ vcat $ map (print_named lid) $ toNamedList thsens

sbShow = renderHtml ga $ pretty sig

in case getThGoals sGTh of

-- show simple view if no goals are found

[] -> return $ htmlPage fstLine "" [ headr, transBt, prvsBt,

unode "h4" "Theory" ] ++ sbShow ++ "\n<br />" ++ thShow

-- else create proving functionality

gs -> do

-- create list of theorems, selectable for proving

let thmSl = map (\ (nm, bp) ->

let gSt = maybe GOpen basicProofToGStatus bp

in add_attrs

[ mkAttr "type" "checkbox", mkAttr "name" $ escStr nm

, mkAttr "unproven" $ showBool $ elem gSt [GOpen, GTimeout]]

$ unode "input" $ nm ++ " (" ++ showSimple gSt ++ ")" ) gs

-- select unproven, all or none theorems by button

(btUnpr, btAll, btNone, jvScr1) = showSelectionButtons True

-- create prove button and prover/comorphism selection

(prSl, cmrSl, jvScr2) <- showProverSelection GlProofs [sublogicOfTh gTh]

let (prBt, timeout) = showProveButton True

-- hidden param field

hidStr = add_attrs [ mkAttr "name" "prove"

, mkAttr "type" "hidden", mkAttr "style" "display:none;"

, mkAttr "value" $ show i ] inputNode

-- combine elements within a form

thmMenu = let br = unode "br " () in add_attrs

[ mkAttr "name" "thmSel", mkAttr "method" "get"]

. unode "form"

$ [hidStr, prSl, cmrSl, br, btUnpr, btAll, btNone, timeout]

++ intersperse br (prBt : thmSl)

-- save dg and return to svg-view

goBack = aRef ('/' : show sessId) "return to DGraph"

return $ htmlPage fstLine (jvScr1 ++ jvScr2)

[ headr, transBt, prvsBt, plain " ", goBack, unode "h4" "Theorems"

, thmMenu, unode "h4" "Theory" ] ++ sbShow ++ "\n<br />" ++ thShow

-- | show window of the autoproof function

showAutoProofWindow :: DGraph -> Int -> ProverMode

-> ResultT IO (String, String)

showAutoProofWindow dg sessId prOrCons = let

dgnodes = labNodesDG dg

-- some parameters need to be different for consistency and autoproof mode

(prMethod, isProver, title, nodeSel) = case prOrCons of

GlProofs -> ("proof", True, "automatic proofs"

, map (\ fn -> add_attrs [ mkAttr "type" "checkbox"

, mkAttr "unproven" $ showBool $ not $ allProved fn

, mkAttr "name" $ escStr $ name fn ]

$ unode "input" $ showHtml fn) $ initFNodes dgnodes)

-- TODO sort out nodes with no sentences!

GlConsistency -> ("cons", False, "consistency checker"

, map (\ (_, dgn) ->

let cstat = getConsistencyOf dgn

nm = getDGNodeName dgn in add_attrs [ mkAttr "type" "checkbox"

, mkAttr "unproven" $ showBool $ sType cstat == CSUnchecked

, mkAttr "name" nm]

$ unode "input" (cStatusToPrefix cstat ++ nm)) dgnodes)

-- generate param field for the query string, invisible to the user

hidStr = add_attrs [ mkAttr "name" "autoproof"

, mkAttr "type" "hidden", mkAttr "style" "display:none;"

, mkAttr "value" prMethod ] inputNode

-- select unproven, all or no nodes by button

(btUnpr, btAll, btNone, jvScr1) = showSelectionButtons isProver

(prBt, timeout) = showProveButton isProver

include = add_attrs [ mkAttr "type" "checkbox", mkAttr "checked" "true"

, mkAttr "name" "includetheorems"] $ unode "input" "include Theorems"

goBack = aRef ('/' : show sessId) "return to DGraph"

in do

(jvScr2, nodeMenu) <- case dgnodes of

-- return simple feedback if no nodes are present

[] -> return ("", plain "nothing to prove (graph has no nodes)")

-- otherwise

(_, nd) : _ -> case maybeResult $ getGlobalTheory nd of

Nothing -> fail $ "cannot compute global theory of:\n" ++ show nd

Just gTh -> do

let br = unode "br " ()

(prSel, cmSel, jvSc) <- lift $ showProverSelection prOrCons

[sublogicOfTh gTh]

return (jvSc, add_attrs

[ mkAttr "name" "nodeSel", mkAttr "method" "get" ]

. unode "form" $

[ hidStr, prSel, cmSel, br, btAll, btNone, btUnpr, timeout

, include ] ++ intersperse br (prBt : nodeSel))

return (htmlC, htmlPage title (jvScr1 ++ jvScr2)

[ goBack, plain " ", nodeMenu ])

showProveButton :: Bool -> (Element, Element)

showProveButton isProver = (prBt, timeout) where

prBt = [ mkAttr "type" "submit", mkAttr "value"

$ if isProver then "Prove" else "Check"]

`add_attrs` inputNode

-- create timeout field

timeout = add_attrs [mkAttr "type" "text", mkAttr "name" "timeout"

, mkAttr "value" "1", mkAttr "size" "3"]

$ unode "input" "Sec/Goal "

-- | select unproven, all or none theorems by button

showSelectionButtons :: Bool -> (Element, Element, Element, String)

showSelectionButtons isProver = (selUnPr, selAll, selNone, jvScr)

where prChoice = if isProver then "SPASS" else "darwin"

selUnPr = add_attrs [mkAttr "type" "button"

, mkAttr "value" $ if isProver then "Unproven" else "Unchecked"

, mkAttr "onClick" "chkUnproven()"] inputNode

selAll = add_attrs [mkAttr "type" "button", mkAttr "value" "All"

, mkAttr "onClick" "chkAll(true)"] inputNode

selNone = add_attrs [mkAttr "type" "button", mkAttr "value" "None"

, mkAttr "onClick" "chkAll(false)"] inputNode

-- javascript features

jvScr = unlines

-- select unproven goals by button

[ "\nfunction chkUnproven() {"

, " var e = document.forms[0].elements;"

, " for (i = 0; i < e.length; i++) {"

, " if( e[i].type == 'checkbox'"

, " && e[i].name != 'includetheorems' )"

, " e[i].checked = e[i].getAttribute('unproven') == 'true';"

, " }"

-- select or deselect all theorems by button

, "}\nfunction chkAll(b) {"

, " var e = document.forms[0].elements;"

, " for (i = 0; i < e.length; i++) {"

, " if( e[i].type == 'checkbox'"

, " && e[i].name != 'includetheorems' ) e[i].checked = b;"

, " }"

-- autoselect SPASS if possible

, "}\nwindow.onload = function() {"

, " prSel = document.forms[0].elements.namedItem('prover');"

, " prs = prSel.getElementsByTagName('option');"

, " for ( i=0; i<prs.length; i++ ) {"

, " if( prs[i].value == '" ++ prChoice ++ "' ) {"

, " prs[i].selected = 'selected';"

, " updCmSel('" ++ prChoice ++ "');"

, " return;"

, " }"

, " }"

-- if SPASS unable, select first one in list

, " prs[0].selected = 'selected';"

, " updCmSel( prs[0].value );"

, "}" ]

-- | create prover and comorphism menu and combine them using javascript

showProverSelection :: ProverMode -> [G_sublogics]

-> IO (Element, Element, String)

showProverSelection prOrCons subLs = do

let jvScr = unlines

-- the chosen prover is passed as param

[ "\nfunction updCmSel(pr) {"

, " var cmrSl = document.forms[0].elements.namedItem('translation');"

-- then, all selectable comorphisms are gathered and iterated

, " var opts = cmrSl.getElementsByTagName('option');"

-- try to keep current comorph-selection

, " var selAccept = false;"

, " for( var i = opts.length-1; i >= 0; i-- ) {"

, " var cmr = opts.item( i );"

-- the list of supported provers is extracted

, " var prs = cmr.getAttribute('4prover').split(';');"

, " var pFit = false;"

, " for( var j = 0; ! pFit && j < prs.length; j++ ) {"

, " pFit = prs[j] == pr;"

, " }"

-- if prover is supported, remove disabled attribute

, " if( pFit ) {"

, " cmr.removeAttribute('disabled');"

, " selAccept = selAccept || cmr.selected;"

-- else create and append a disabled attribute

, " } else {"

, " var ds = document.createAttribute('disabled');"

, " ds.value = 'disabled';"

, " cmr.setAttributeNode(ds);"

, " }"

, " }"

-- check if selected comorphism fits, and select fst. in list otherwise

, " if( ! selAccept ) {"

, " for( i = 0; i < opts.length; i++ ) {"

, " if( ! opts.item(i).disabled ) {"

, " opts.item(i).selected = 'selected';"

, " return;"

, " }"

, " }"

, " }"

, "}" ]

pcs <- mapM (liftM proversToStringAux . (case prOrCons of

GlProofs -> getProversAux

GlConsistency -> getConsCheckersAux) Nothing) subLs

let allPrCm = nub $ concat pcs

-- create prover selection (drop-down)

prs = add_attr (mkAttr "name" "prover") $ unode "select" $ map (\ p ->

add_attrs [mkAttr "value" p, mkAttr "onClick"

$ "updCmSel('" ++ p ++ "')"]

$ unode "option" p) $ showProversOnly allPrCm

-- create comorphism selection (drop-down)

cmrs = add_attr (mkAttr "name" "translation") $ unode "select"

$ map (\ (cm, ps) -> let c = showComorph cm in

add_attrs [mkAttr "value" c, mkAttr "4prover" $ intercalate ";" ps]

$ unode "option" c) allPrCm

return (prs, cmrs, jvScr)

showHtml :: FNode -> String

showHtml fn = name fn ++ " " ++ goalsToPrefix (toGtkGoals fn)

getAllAutomaticProvers :: G_sublogics -> IO [(G_prover, AnyComorphism)]

getAllAutomaticProvers subL =

getUsableProvers ProveCMDLautomatic subL logicGraph

filterByProver :: Maybe String -> [(G_prover, AnyComorphism)]

-> [(G_prover, AnyComorphism)]

filterByProver mp = case mp of

Nothing -> id

Just p -> filter ((== p) . mkNiceProverName . getProverName . fst)

filterByComorph :: Maybe String -> [(a, AnyComorphism)]

-> [(a, AnyComorphism)]

filterByComorph mt = case mt of

Nothing -> id

Just c -> filter ((== c) . showComorph . snd)

getProverAndComorph :: Maybe String -> Maybe String -> G_sublogics

-> IO [(G_prover, AnyComorphism)]

getProverAndComorph mp mc subL = do

ps <- getFilteredProvers mc subL

let spps = case filterByProver (Just "SPASS") ps of

[] -> ps

fps -> fps

return $ case mp of

Nothing -> spps

_ -> filterByProver mp ps

getProverList :: ProverMode -> Maybe String -> G_sublogics

-> IO [(AnyComorphism, [ProverOrConsChecker])]

getProverList mp mt subL = case mp of

GlProofs -> getProversAux mt subL

GlConsistency -> getConsCheckersAux mt subL

getFullProverList :: ProverMode -> Maybe String -> DGraph

-> IO [(AnyComorphism, [ProverOrConsChecker])]

getFullProverList mp mt = foldM

(\ ls (_, nd) -> maybe (return ls) (fmap (++ ls) . case mp of

GlProofs -> getProversAux mt

GlConsistency -> getConsCheckersAux mt

. sublogicOfTh)

$ maybeResult $ getGlobalTheory nd) [] . labNodesDG

groupOnSnd :: Eq b => (a -> c) -> [(a, b)] -> [(b, [c])]

groupOnSnd f =

map (\ l@((_, b) : _) -> (b, map (f . fst) l)) . groupBy (on (==) snd)

proversToStringAux :: [(AnyComorphism, [ProverOrConsChecker])]

-> [(AnyComorphism, [String])]

proversToStringAux = map (\ (x, ps) ->

(x, map (mkNiceProverName . internalProverName) ps))

{- | gather provers and comorphisms and resort them to

(comorhism, supported provers) while not changing orig comorphism order -}

getProversAux :: Maybe String -> G_sublogics

-> IO [(AnyComorphism, [ProverOrConsChecker])]

getProversAux mt x =

fmap (groupOnSnd AbsState.Prover) $ getFilteredProvers mt x

getFilteredProvers :: Maybe String -> G_sublogics

-> IO [(G_prover, AnyComorphism)]

getFilteredProvers mt = fmap (filterByComorph mt) . getAllAutomaticProvers

formatProvers :: ProverMode -> [(AnyComorphism, [String])] -> String

formatProvers pm = let

tag = case pm of

GlProofs -> "prover"

GlConsistency -> "consistency-checker"

in ppTopElement . unode (tag ++ "s") . map (unode tag)

. showProversOnly

-- | retrieve a list of consistency checkers

getConsCheckersAux :: Maybe String -> G_sublogics

-> IO [(AnyComorphism, [ProverOrConsChecker])]

getConsCheckersAux mt =

fmap (groupOnSnd AbsState.ConsChecker) . getFilteredConsCheckers mt

getFilteredConsCheckers :: Maybe String -> G_sublogics

-> IO [(G_cons_checker, AnyComorphism)]

getFilteredConsCheckers mt = fmap

(filterByComorph mt . filter (getCcBatch . fst))

. getConsCheckers . findComorphismPaths logicGraph

getComorphs :: Maybe String -> G_sublogics -> IO [(G_prover, AnyComorphism)]

getComorphs mp = fmap (filterByProver mp)

. getAllAutomaticProvers

getFullComorphList :: DGraph -> IO [(G_prover, AnyComorphism)]

getFullComorphList = foldM

(\ ls (_, nd) -> maybe (return ls)

(fmap (++ ls) . getAllAutomaticProvers . sublogicOfTh)

$ maybeResult $ getGlobalTheory nd) [] . labNodesDG

formatComorphs :: [(G_prover, AnyComorphism)] -> String

formatComorphs = ppTopElement . unode "translations"

. map (unode "comorphism") . nubOrd . map (showComorph . snd)

consNode :: LibEnv -> LibName -> DGraph -> (Int, DGNodeLab)

-> G_sublogics -> Bool -> Maybe String -> Maybe String -> Maybe Int

-> ResultT IO (LibEnv, [ProofResult])

consNode le ln dg nl@(i, lb) subL useTh mp mt tl = do

consList <- lift $ getFilteredConsCheckers mt subL

let findCC x = filter ((== x ) . getCcName . fst) consList

mcc = maybe (findCC "darwin") findCC mp

case mcc of

[] -> fail "no cons checker found"

((cc, c) : _) -> lift $ do

cstat <- consistencyCheck useTh cc c ln le dg nl $ fromMaybe 1 tl

-- Consistency Results are stored in LibEnv via DGChange object

let cSt = sType cstat

le'' = if cSt == CSUnchecked then le else

Map.insert ln (changeDGH dg $ SetNodeLab lb

(i, case cSt of

CSInconsistent -> markNodeInconsistent "" lb

CSConsistent -> markNodeConsistent "" lb

_ -> lb)) le

return (le'', [(" ", drop 2 $ show cSt, show cstat,

AbsState.ConsChecker cc, c, Nothing)])

proveNode :: LibEnv -> LibName -> DGraph -> (Int, DGNodeLab) -> G_theory

-> G_sublogics -> Bool -> Maybe String -> Maybe String -> Maybe Int

-> [String] -> [String] -> ResultT IO (LibEnv, [ProofResult])

proveNode le ln dg nl gTh subL useTh mp mt tl thms axioms = do

ps <- lift $ getProverAndComorph mp mt subL

case ps of

[] -> fail "no matching translation or prover found"

cp : _ -> do

let ks = map fst $ getThGoals gTh

diffs = Set.difference (Set.fromList thms)

$ Set.fromList ks

unless (Set.null diffs) . fail $ "unknown theorems: " ++ show diffs

when (null thms && null ks) $ fail "no theorems to prove"

((nTh, sens), (_, proofStatuses)) <- autoProofAtNode useTh

(maybe 1 (max 1) tl)

(if null thms then ks else thms) axioms gTh cp

return (if null sens then le else

Map.insert ln ( updateLabelTheory le dg nl nTh) le

, combineToProofResult sens cp proofStatuses

)

combineToProofResult :: [(String, String, String)] -> (G_prover, AnyComorphism)

-> [ProofStatus G_proof_tree] -> [ProofResult]

combineToProofResult sens (prover, comorphism) proofStatuses = let

findProofStatusByName :: String -> Maybe (ProofStatus G_proof_tree)

findProofStatusByName n =

case filter ((n ==) . goalName) proofStatuses of

[] -> Nothing

(ps : _) -> Just ps

combineSens :: (String, String, String) -> ProofResult

combineSens (n, e, d) = (n, e, d, AbsState.Prover prover, comorphism,

findProofStatusByName n)

in map combineSens sens

-- run over multiple dgnodes and prove available goals for each

proveMultiNodes :: ProverMode -> LibEnv -> LibName -> DGraph -> Bool

-> Maybe String -> Maybe String -> Maybe Int -> [String] -> [String]

-> ResultT IO (LibEnv, [(String, [ProofResult])])

proveMultiNodes pm le ln dg useTh mp mt tl nodeSel axioms = let

runProof :: LibEnv -> G_theory -> (Int, DGNodeLab)

-> ResultT IO (LibEnv, [ProofResult])

runProof le' gTh nl = let

subL = sublogicOfTh gTh

dg' = lookupDGraph ln le' in case pm of

GlConsistency -> consNode le' ln dg' nl subL useTh mp mt tl

GlProofs ->

proveNode le' ln dg' nl gTh subL useTh mp mt tl

(map fst $ getThGoals gTh) axioms

nodes2check = filter (case nodeSel of

[] -> case pm of

GlConsistency -> const True

GlProofs -> hasOpenGoals . snd

_ -> (`elem` nodeSel) . getDGNodeName . snd) $ labNodesDG dg

in foldM

(\ (le', res) nl@(_, dgn) -> case maybeResult $ getGlobalTheory dgn of

Nothing -> fail $

"cannot compute global theory of:\n" ++ show dgn

Just gTh -> do

(le'', proofResults) <- runProof le' gTh nl

return (le'', (getDGNodeName dgn, proofResults) : res))

(le, []) nodes2check

formatResultsAux :: Bool -> ProverMode -> String -> [ProofResult] -> Element

formatResultsAux xF pm nm sens = unode nm $ case (sens, pm) of

([(_, e, d, _, _, _)], GlConsistency) | xF -> formatConsNode e d

_ -> unode "results" $ formatGoals xF sens

mkPath :: Session -> LibName -> Int -> String

mkPath sess l k =

'/' : concat [ libToFileName l ++ "?session="

| l /= sessLibName sess ]

++ show k

extPath :: Session -> LibName -> Int -> String

extPath sess l k = mkPath sess l k ++

if l /= sessLibName sess then "&" else "?"

globalCommands :: [String]

globalCommands = map (cmdlGlobCmd . fst) allGlobLibAct

sessAns :: LibName -> ResultT IO String -> (Session, Int)

-> ResultT IO (String, String)

sessAns libName svgComp (sess, k) =

svgComp >>= \ svg -> return $ sessAnsAux libName svg (sess, k)

sessAnsAux :: LibName -> String -> (Session, Int) -> (String, String)

sessAnsAux libName svg (sess, k) =

let libEnv = sessLibEnv sess

ln = libToFileName libName

libref l =

aRef (mkPath sess l k) (libToFileName l) : map (\ d ->

aRef (extPath sess l k ++ d) d) displayTypes

libPath = extPath sess libName k

ref d = aRef (libPath ++ d) d

autoProofBt = aRef ('/' : show k ++ "?autoproof") "automatic proofs"

consBt = aRef ('/' : show k ++ "?consistency") "consistency checker"

-- the html quicklinks to nodes and edges have been removed with R.16827

in (htmlC, htmlPage

('(' : shows k ")" ++ ln)

[]

(bold ("library " ++ ln)

: map ref displayTypes

++ menuElement : loadXUpdate (libPath ++ updateS)

: plain "tools:" : mkUnorderedList [autoProofBt, consBt]

: plain "commands:"

: mkUnorderedList (map ref globalCommands)

: plain "imported libraries:"

: [mkUnorderedList $ map libref $ Map.keys libEnv]

) ++ svg)

getHetsLibContent :: HetcatsOpts -> String -> [QueryPair] -> IO [Element]

getHetsLibContent opts dir query = do

let hlibs = libdirs opts

ds <- if null dir || isAbsolute dir then return hlibs else

filterM doesDirectoryExist $ map (</> dir) hlibs

fs <- fmap (sortBy cmpFilePath . filter (not . isPrefixOf ".") . concat)

$ mapM getDirContents ds

return $ map (mkHtmlRef query) $ getParent dir : fs

getParent :: String -> String

getParent = addTrailingPathSeparator . ("/" </>) . takeDirectory

. dropTrailingPathSeparator

-- | a variant that adds a trailing slash

getDirContents :: FilePath -> IO [FilePath]

getDirContents d = do

fs <- getDirectoryContents d

mapM (\ f -> doesDirectoryExist (d </> f) >>= \ b -> return

$ if b then addTrailingPathSeparator f else f) fs

aRef :: String -> String -> Element

aRef lnk txt = add_attr (mkAttr "href" lnk) $ unode "a" txt

mkHtmlRef :: [QueryPair] -> String -> Element

mkHtmlRef query entry = unode "dir" $ aRef

(entry ++ if null query then "" else '?' : intercalate "&"

(map (\ (x, ms) -> x ++ maybe "" ('=' :) ms) query)) entry

mkUnorderedList :: Node t => [t] -> Element

mkUnorderedList = unode "ul" . map (unode "li")

italic :: String -> Element

italic = unode "i"

bold :: String -> Element

bold = unode "b"

plain :: String -> Element

plain = unode "p"

headElems :: String -> [Element]

headElems path = let d = "default" in unode "strong" "Choose a display type:" :

map (\ q -> aRef (if q == d then "/" </> path else '?' : q) q)

(d : displayTypes)

++ [ unode "p"

[ unode "small" "internal command overview as XML:"

, menuElement ]

, plain $ "Select a local file as library or "

++ "enter a DOL specification in the text area and press \"submit\""

++ ", or browse through our Hets-lib library below."

, uploadHtml ]

menuElement :: Element

menuElement = aRef "?menus" "menus"

inputNode :: Element

inputNode = unode "input" ()

loadNode :: String -> Element

loadNode nm = add_attrs

[ mkAttr "type" "file"

, mkAttr "name" nm

, mkAttr "size" "40"]

inputNode

submitNode :: Element

submitNode = add_attrs

[ mkAttr "type" "submit"

, mkAttr "value" "submit"]

inputNode

mkForm :: String -> [Element] -> Element

mkForm a = add_attrs

[ mkAttr "action" a

, mkAttr "enctype" "multipart/form-data"

, mkAttr "method" "post" ]

. unode "form"

uploadHtml :: Element

uploadHtml = mkForm "/"

[ loadNode "file"

, unode "p" $ add_attrs

[ mkAttr "cols" "68"

, mkAttr "rows" "22"

, mkAttr "name" "content" ] $ unode "textarea" ""

, submitNode ]

loadXUpdate :: String -> Element

loadXUpdate a = mkForm a

[ italic xupdateS

, loadNode xupdateS

, italic "impacts"

, loadNode "impacts"

, submitNode ]