{- |

Module : $Header$

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

import PGIP.Query as Query

import Driver.Options

import Driver.ReadFn

import Driver.Version

import Network.Wai.Handler.Warp

import Network.HTTP.Types (Status, status200, status400, status403, status405)

import Control.Monad.Trans (lift, liftIO)

import qualified Data.Text as T

import Network.Wai

import Network.Wai.Parse

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.DgUtils

import Static.DotGraph

import Static.FromXml

import Static.GTheory

import Static.History (changeDGH)

import Static.PrintDevGraph

import Static.ToXml as ToXml

import Syntax.ToXml

import Syntax.Print_AS_Structured

import Interfaces.Command

import Interfaces.CmdAction

import Comorphisms.LogicGraph

import Logic.Prover

import Logic.Grothendieck

import Logic.Comorphism

import Logic.Logic

import Proofs.AbstractState

import Proofs.ConsistencyCheck

import Text.XML.Light

import Text.XML.Light.Cursor hiding (findChild)

import Common.AutoProofUtils

import Common.Doc

import Common.DocUtils (Pretty, pretty, showGlobalDoc, showDoc)

import Common.ExtSign (ExtSign (..))

import Common.GtkGoal

import Common.IRI

import Common.LibName

import Common.PrintLaTeX

import Common.Result

import Common.ResultT

import Common.ToXml

import Common.Utils

import Common.XUpdate

import Control.Monad

import qualified Data.IntMap as IntMap

import qualified Data.Map as Map

import qualified Data.Set as Set

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 System.Random

import System.Directory

import System.Exit

import System.FilePath

import System.IO

data Session = Session

{ sessLibEnv :: LibEnv

, sessLibName :: LibName

, _previousKeys :: [Int]

, _sessStart :: UTCTime }

randomKey :: IO Int

randomKey = randomRIO (100000000, 999999999)

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

sessGraph dgQ (Session le ln _ _) = case dgQ of

DGQuery _ (Just path) ->

find (\ (n, _) -> show (getLibId n) == path)

$ Map.toList le

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

hetsServer :: HetcatsOpts -> IO ()

hetsServer opts1 = do

tempDir <- getTemporaryDirectory

let tempHetsLib = tempDir </> "MyHetsLib"

permFile = tempDir </> "empty.txt"

opts = opts1 { libdirs = tempHetsLib : libdirs opts1 }

createDirectoryIfMissing False tempHetsLib

writeFile permFile ""

sessRef <- newIORef IntMap.empty

run 8000 $ \ re -> do

let (query, splitQuery) = queryToString $ queryString re

rhost = shows (remoteHost re) "\n"

bots = ["180.76.", "77.75.77.", "66.249.", "141.8.147."]

queryToString s = let

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

in (('?' :) . intercalate "&" $ map

(\ (x, ms) -> x ++ maybe "" ('=' :) ms) r, r)

pathBits = map T.unpack $ pathInfo re

path = intercalate "/" pathBits

liftRun = liftIO

liftRun $ do

time <- getCurrentTime

createDirectoryIfMissing False tempHetsLib

m <- readIORef sessRef

if isPrefixOf "134.102.204.54" rhost -- nagios-plugins 1.4.15

then appendFile permFile "."

else do

appendFile permFile $ shows time " sessions: "

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

appendFile permFile rhost

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

-- better try to read hosts to exclude from a file

if any (`isInfixOf` rhost) bots then return $ mkResponse status403 ""

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

else if isRESTfull pathBits then liftRun $

parseRESTfull opts sessRef pathBits query splitQuery re

-- only otherwise stick to the old response methods

else case B8.unpack (requestMethod re) of

"GET" -> liftRun $ if isInfixOf "menus" query then mkMenuResponse else do

dirs@(_ : cs) <- getHetsLibContent opts path query

if not $ null cs then mkHtmlPage path dirs

-- AUTOMATIC PROOFS (parsing)

else if isPrefixOf "?autoproof=" query then

let qr k = Query (DGQuery k Nothing) $

anaAutoProofQuery splitQuery in do

Result ds ms <- runResultT $ case readMaybe $ head pathBits of

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

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

return $ case ms of

Nothing -> mkResponse status400 $ showRelDiags 1 ds

Just s -> mkOkResponse s

-- AUTOMATIC PROOFS E.N.D.

else getHetsResponse opts [] sessRef pathBits splitQuery

"POST" -> do

(params, files) <- parseRequestBody tempFileBackEnd re

mTmpFile <- liftRun $ 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 do

tmpFile <- getTempFile content "temp.het"

copyPermissions permFile tmpFile

return $ Just tmpFile

let res tmpFile =

getHetsResponse opts [] sessRef [tmpFile] splitQuery

mRes = maybe (return $ mkResponse status400 "nothing submitted")

res mTmpFile

liftRun $ case files of

[] -> if isPrefixOf "?prove=" query then

getHetsResponse opts [] sessRef pathBits

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

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

else mRes

[(_, f)] | query /= "?update" -> do

let fn = takeFileName $ B8.unpack $ fileName f

if any isAlphaNum fn then do

let tmpFile = tempHetsLib </> fn

snkFile = fileContent f

copyPermissions permFile snkFile

copyFile snkFile tmpFile

maybe (res tmpFile) res mTmpFile

else mRes

_ -> getHetsResponse

opts (map snd files) sessRef pathBits splitQuery

_ -> return $ mkResponse status405 ""

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

anaAutoProofQuery :: [(String, Maybe String)] -> QueryKind

anaAutoProofQuery splitQuery = let

lookup2 str = fromMaybe Nothing $ lookup str 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

prOrCons = case lookup2 "autoproof" of

Just "proof" -> GlProofs

Just "cons" -> GlConsistency

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

in GlAutoProve prOrCons include prover trans timeout nodeSel

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

isRESTfull :: [String] -> Bool

isRESTfull pathBits = pathBits /= [] &&

elem (head pathBits) listRESTfullIdentifiers

listRESTfullIdentifiers :: [String]

listRESTfullIdentifiers =

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

++ nodeEdgeIdes ++ newRESTIdes

nodeEdgeIdes :: [String]

nodeEdgeIdes = ["nodes", "edges"]

newRESTIdes :: [String]

newRESTIdes =

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

, "consistency-check" ]

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

parseRESTfull :: HetcatsOpts -> IORef (IntMap.IntMap Session)

-> [String] -> String -> [(String, Maybe String)]

-> Request -> IO Response

parseRESTfull opts sessRef pathBits query splitQuery re = 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) -}

lookup2 str = fromMaybe Nothing $ lookup str splitQuery

session = lookup2 "session" >>= readMaybe

library = lookup2 "library" >>= fmap iriPath . parseIRI

format = lookup2 "format"

queryFailure = fail $ "this query does not comply with RESTfull interface: "

++ intercalate "/" pathBits

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

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

parseNodeQuery ndIri sId ncmd = ncmd >>= case parseIRI ndIri of

Nothing -> fail $ "failed to parse nodeIRI from " ++ ndIri

Just nd -> let

s = iriFragment nd

i = maybe (Right s) Left $ readMaybe s

in return . Query (DGQuery sId (Just $ iriPath nd)) . NodeQuery i

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

getResponse qr = do

Result ds ms <- runResultT $ getHetsResult opts [] sessRef qr

return $ case ms of

Nothing -> mkResponse status400 $ showRelDiags 1 ds

Just s -> mkOkResponse s

-- respond depending on request Method

in case B8.unpack (requestMethod re) of

"POST" -> case pathBits of

-- open new session for dg. NOTE:does not differ from GET/library for now

"libraries" : libIri : "sessions" : [] -> case parseIRI libIri of

Just lib -> getResponse $ Query (NewDGQuery $ iriPath lib)

$ DisplayQuery format

Nothing -> fail $ "failed to parse libIRI from " ++ libIri

-- fail if query doesn't comply with RESTFullInterface

_ -> queryFailure

"GET" -> case pathBits of

-- show all menue options

"menus" : [] -> mkMenuResponse

-- list files from directory

"dir" : r -> let path' = (intercalate "/" r) in

getHetsLibContent opts path' query >>= mkHtmlPage path'

-- get dgraph from file

"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" : [] ->

case parseIRI libIri of

Just lib -> getResponse $ Query (NewDGQuery $ iriPath lib)

$ DisplayQuery format

Nothing -> fail $ "failed to parse libIRI from " ++ libIri

-- get previously created session

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

Nothing -> fail $ "failed to read session number from " ++ sessId

Just sId -> let mt = lookup2 "translations" in

(case lookup2 "node" of

Just ndIri -> parseNodeQuery ndIri sId $ case cmd of

["provers"] -> return $ NcProvers mt

["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 mt

["translations"] -> return GlTranslations

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

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

-- get node or edge view

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

dgQ ir = maybe (NewDGQuery $ fromMaybe (iriPath ir) library)

(`DGQuery` library) session

in case (elemIndex nodeOrEdge nodeEdgeIdes, parseIRI codedIri) of

(Just 0, Just n) -> let

s = iriFragment n

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

getResponse $ Query (dgQ n) $ NodeQuery i $ case c of

["theory"] -> NcCmd Query.Theory

_ -> NcCmd Query.Info

(Just 1, Just l) -> case readMaybe $ iriFragment l of

Just i -> getResponse $ Query (dgQ l) $ EdgeQuery (EdgeId i) "edge"

Nothing -> fail $ "failed to read edgeId from " ++ iriFragment l

_ -> fail $ "failed to parse IRI from " ++ codedIri

newIde : libIri : _ | elem newIde newRESTIdes ->

case parseIRI libIri of

Just lib -> getResponse $ Query (NewDGQuery $ iriPath lib)

$ DisplayQuery (Just "xml")

Nothing -> fail $ "failed to parse libIRI from " ++ libIri

-- fail if query doesn't seem to comply

_ -> queryFailure

"PUT" -> case pathBits of

{- execute global commands

TODO load other library ??? -}

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

case readMaybe prId of

Nothing -> fail $ "failed to read sessionId from " ++ prId

Just sessId -> let

dgQ = DGQuery sessId $ fmap iriPath $ parseIRI libIri in

getResponse $ Query dgQ $ GlobCmdQuery cmd

-- execute a proof or calculus request

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

Nothing -> fail $ "failed to read sessionId from " ++ sessId

Just sId -> case cmd of

"prove" -> let

incl = maybe False (\ s ->

notElem (map toLower s) ["f", "false"]) $ lookup2 "include"

prover = lookup2 "prover"

translation = lookup2 "translation" >>= fmap iriFragment . parseIRI

timeout = lookup2 "timeout" >>= readMaybe

in (case lookup2 "node" of

-- prove all nodes if no singleton is selected

Nothing -> return $ Query (DGQuery sId Nothing)

$ GlAutoProve GlProofs incl prover translation timeout []

-- otherwise run prover for single node only

Just ndIri -> parseNodeQuery ndIri sId $ return

$ ProveNode incl prover translation timeout []) >>= getResponse

-- OTHER CMD | look for (optional) specification of node OR edge

_ -> (case (lookup2 "node", lookup2 "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 command upon a single edge

(Nothing, Just edIri) -> case parseIRI edIri

>>= readMaybe . iriFragment of

-- TODO no command passed on. why?

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

$ EdgeQuery (EdgeId i) "edge"

Nothing -> fail $ "failed to read edgeId from edgeIRI: " ++ edIri

-- call a global command -- TODO should i check if cmd exists?

_ -> 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) -}

_ -> return $ mkResponse status405 ""

mkMenuResponse :: IO Response

mkMenuResponse = return $ mkOkResponse $ ppTopElement $ unode "menus" mkMenus

mkMenus :: [Element]

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

: menuTriple "/DGraph" "update" "update"

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

allGlobLibAct

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

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

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

menuTriple q d c = unode "triple"

[ unode "xquery" q

, unode "displayname" d

, unode "command" c ]

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

mkHtmlString path dirs = htmlHead ++ mkHtmlElem

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

(unode "h1" ("Hets " ++ hetcats_version) : unode "p"

[ bold "Hompage:"

, aRef "http://www.dfki.de/cps/hets" "dfki.de/cps/hets"

, bold "Contact:"

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

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

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

mkHtmlElem :: String -> [Element] -> String

mkHtmlElem title body = ppElement $ unode "html"

[ unode "head" $ unode "title" title, unode "body" body ]

-- include a script within page (manual tags to avoid encoding)

mkHtmlElemScript :: String -> String -> [Element] -> String

mkHtmlElemScript title scr body = "<html>\n<head>\n"

++ ppElement (unode "title" title) ++ "\n<script type=text/javascript>"

++ scr ++ "</script>\n</head>\n" ++ ppElement (unode "body" body)

++ "</html>"

mkHtmlPage :: FilePath -> [Element] -> IO Response

mkHtmlPage path = return . mkOkResponse . mkHtmlString path

mkResponse :: Status -> String -> Response

mkResponse st = responseLBS st [] . BS.pack

mkOkResponse :: String -> Response

mkOkResponse = mkResponse status200

addNewSess :: IORef (IntMap.IntMap Session) -> Session -> IO Int

addNewSess sessRef sess = do

k <- randomKey

atomicModifyIORef sessRef

(\ m -> (IntMap.insert k sess m, k))

nextSess :: IORef (IntMap.IntMap Session) -> LibEnv -> Int -> IO Session

nextSess sessRef newLib k =

atomicModifyIORef sessRef

(\ m -> case IntMap.lookup k m of

Nothing -> error "nextSess"

Just s -> let newSess = s { sessLibEnv = newLib }

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

ppDGraph :: DGraph -> Maybe PrettyType -> ResultT IO 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 $ ppTopElement $ xmlLibDefn logicGraph ga ld

PrettyAscii _ -> return $ renderText ga d ++ "\n"

PrettyHtml -> return $ htmlHead ++ renderHtml ga d

PrettyLatex _ -> return latex

Nothing -> lift $ do

tmpDir <- getTemporaryDirectory

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

tmpDir "temp.tex"

copyPermissions (tmpDir </> "empty.txt") tmpFile

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 str

else return $ "could not create pdf:\n"

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

getDGraph :: HetcatsOpts -> IORef (IntMap.IntMap Session) -> DGQuery

-> ResultT IO (Session, Int)

getDGraph opts sessRef dgQ = case dgQ of

NewDGQuery file -> do

(ln, le) <- case guess file GuessIn of

DgXml -> do

mf <- lift $ findFileOfLibName opts file

case mf of

Just f -> readDGXmlR opts f Map.empty

Nothing -> liftR $ fail "xml file not found"

_ -> anaSourceFile logicGraph opts

{ outputToStdout = False, useLibPos = True }

Set.empty emptyLibEnv emptyDG file

time <- lift getCurrentTime

let sess = Session le ln [] time

k <- lift $ addNewSess sessRef sess

return (sess, k)

DGQuery k _ -> do

m <- lift $ readIORef sessRef

case IntMap.lookup k m of

Nothing -> liftR $ fail "unknown development graph"

Just sess -> return (sess, k)

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

-- | with the 'old' call of getHetsResponse, anaUri is called upon the path

getHetsResponse :: HetcatsOpts -> [FileInfo FilePath]

-> IORef (IntMap.IntMap Session) -> [String] -> [QueryPair] -> IO Response

getHetsResponse opts updates sessRef pathBits query = do

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

Left err -> fail err

Right q -> getHetsResult opts updates sessRef q

return $ case ms of

Nothing -> mkResponse status400 $ showRelDiags 1 ds

Just s -> mkOkResponse s

getHetsResult :: HetcatsOpts -> [FileInfo FilePath]

-> IORef (IntMap.IntMap Session) -> Query -> ResultT IO String

getHetsResult opts updates sessRef (Query dgQ qk) = do

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

let libEnv = sessLibEnv sess

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

$ sessGraph dgQ sess

let title = show $ getLibId ln

svg <- getSVG title ('/' : show k) dg

case qk of

DisplayQuery ms -> case ms of

Just "svg" -> return svg

Just "xml" -> liftR $ return $ ppTopElement

$ ToXml.dGraph libEnv ln dg

Just "dot" -> liftR $ return $ dotGraph title False title dg

Just "symbols" -> liftR $ return $ ppTopElement

$ ToXml.dgSymbols dg

Just "session" -> liftR $ return $ ppElement

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

Just str | elem str ppList

-> ppDGraph dg $ lookup str $ zip ppList prettyList

_ -> liftR $ return $ sessAns ln svg sk

GlProvers mt -> return $ getFullProverList mt dg

GlTranslations -> return $ getFullComorphList dg

GlShowProverWindow prOrCons -> showAutoProofWindow dg k prOrCons

GlAutoProve prOrCons incl mp mt tl nds -> do

(newLib, sens) <-

proveMultiNodes prOrCons libEnv ln dg incl mp mt tl nds

if null sens then return "nothing to prove" else do

lift $ nextSess sessRef newLib k

return $ formatResultsMultiple k sens prOrCons

GlobCmdQuery s ->

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

Nothing -> if s == "update" then

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

. fileName) updates of

ch : _ -> do

str <- lift $ readFile $ fileContent ch

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

newSess <- lift $ nextSess sessRef newLib k

liftR $ return $ sessAns newLn svg (newSess, k)

[] -> liftR $ return $ sessAns ln svg sk

else fail "getHetsResult.GlobCmdQuery"

Just (_, act) -> do

newLib <- liftR $ act ln libEnv

newSess <- lift $ nextSess sessRef newLib k

-- calculate updated SVG-view from modified development graph

newSvg <- getSVG title ('/' : show k) $ lookupDGraph ln newLib

liftR $ return $ 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 $ ppTopElement

$ showSymbols ins (globalAnnos dg) dgnode

_ -> return $ 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 incl mp mt tl thms -> do

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

gTh subL incl mp mt tl thms

if null sens then return "nothing to prove" else do

lift $ nextSess sessRef newLib k

return $ formatResults k i $ unode "results" $

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

[unode "name" n, unode "result" e]) sens

_ -> return $ case nc of

NcCmd Query.Theory ->

showGlobalTh dg i gTh k fstLine

NcProvers mt -> getProvers mt subL

NcTranslations mp -> getComorphs mp subL

_ -> error "getHetsResult.NodeQuery."

EdgeQuery i _ ->

case getDGLinksById i dg of

[e@(_, _, l)] -> return $ showLEdge e ++ "\n" ++ showDoc l ""

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

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

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

formatResultsMultiple sessId rs prOrCons = 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 :: Int -> Int -> Element -> String

formatResults sessId i rs = 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

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

and select proving options -}

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

[] -> mkHtmlElem fstLine [ headr, transBt, prvsBt,

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

-- else create proving functionality

gs -> let

-- create list of theorems, selectable for proving

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]

(prBt, timeout) = showProveButton

-- 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"

in mkHtmlElemScript 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

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

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 -> let

br = unode "br " ()

(prSel, cmSel, jvSc) = showProverSelection prOrCons

[sublogicOfTh gTh]

in 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 $ mkHtmlElemScript title (jvScr1 ++ jvScr2)

[ goBack, plain " ", nodeMenu ]

showProveButton :: (Element, Element)

showProveButton = (prBt, timeout) where

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

`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]

-> (Element, Element, String)

showProverSelection prOrCons subLs = 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;"

, " }"

, " }"

, " }"

, "}" ]

allPrCm = nub $ concatMap (case prOrCons of

GlProofs -> getProversAux Nothing

GlConsistency -> getConsCheckersAux) subLs

-- 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

in (prs, cmrs, jvScr)

showHtml :: FNode -> String

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

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

getAllAutomaticProvers subL = getAllProvers ProveCMDLautomatic subL logicGraph

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

-> [(G_prover, AnyComorphism)]

filterByProver mp = case mp of

Nothing -> id

Just p -> filter ((== p) . getWebProverName . fst)

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

-> [(G_prover, AnyComorphism)]

filterByComorph mt = case mt of

Nothing -> id

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

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

-> [(G_prover, AnyComorphism)]

getProverAndComorph mp mc subL =

let ps = filterByComorph mc $ getAllAutomaticProvers subL

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

[] -> ps

fps -> fps

in case mp of

Nothing -> spps

_ -> case filterByProver mp ps of

[] -> spps

mps -> mps

showComorph :: AnyComorphism -> String

showComorph (Comorphism cid) = removeFunnyChars . drop 1 . dropWhile (/= ':')

. map (\ c -> if c == ';' then ':' else c)

$ language_name cid

removeFunnyChars :: String -> String

removeFunnyChars = filter (\ c -> isAlphaNum c || elem c "_.:-")

getWebProverName :: G_prover -> String

getWebProverName = removeFunnyChars . getProverName

getProvers :: Maybe String -> G_sublogics -> String

getProvers mt subL = formatProvers $ getProversAux mt subL

getFullProverList :: Maybe String -> DGraph -> String

getFullProverList mt = formatProvers . foldr

(\ (_, nd) ls -> maybe ls ((++ ls) . getProversAux mt . sublogicOfTh)

$ maybeResult $ getGlobalTheory nd) [] . labNodesDG

showProversOnly :: [(AnyComorphism, [String])] -> [String]

showProversOnly = nubOrd . concatMap snd

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

groupOnSnd f =

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

{- | gather provers and comorphisms and resort them to

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

getProversAux :: Maybe String -> G_sublogics -> [(AnyComorphism, [String])]

getProversAux mt = groupOnSnd getWebProverName

. filterByComorph mt . getAllAutomaticProvers

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

formatProvers = ppTopElement . unode "provers" . map (unode "prover")

. showProversOnly

-- | retrieve a list of consistency checkers

getConsCheckersAux :: G_sublogics -> [(AnyComorphism, [String])]

getConsCheckersAux = groupOnSnd getCcName

. filter (getCcBatch . fst) . getConsCheckers

. findComorphismPaths logicGraph

getComorphs :: Maybe String -> G_sublogics -> String

getComorphs mp subL = formatComorphs . filterByProver mp

$ getAllAutomaticProvers subL

getFullComorphList :: DGraph -> String

getFullComorphList = formatComorphs . foldr

(\ (_, nd) ls -> maybe ls ((++ ls) . getAllAutomaticProvers . sublogicOfTh)

$ maybeResult $ getGlobalTheory nd) [] . labNodesDG

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

formatComorphs = ppTopElement . unode "translations"

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

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

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

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

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

getProverAndComorph mp mt subL of

[] -> fail "no 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

((nTh, sens), _) <- autoProofAtNode useTh (maybe 1 (max 1) tl) thms gTh cp

if null sens then return (le, sens) else return

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

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

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

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

-> ResultT IO (LibEnv, [Element])

proveMultiNodes prOrCons le ln dg useTh mp mt tl nodeSel = let

runProof le' gTh nl@(i, lb) = let

subL = sublogicOfTh gTh

dg' = lookupDGraph ln le' in case prOrCons of

GlConsistency -> let

consList = getConsCheckers $ findComorphismPaths logicGraph subL

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

mcc = maybe (findCC "darwin") findCC mp

in 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 le'' = Map.insert ln (changeDGH dg' $ SetNodeLab lb

(i, if sType cstat == CSInconsistent then

markNodeInconsistent "" lb

else markNodeConsistent "" lb)) le'

return (le'', [(" ", show cstat)])

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

$ map fst $ getThGoals gTh

nodes2check = filter (case nodeSel of

[] -> case prOrCons 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'', sens) <- runProof le' gTh nl

return (le'', formatResultsAux (getDGNodeName dgn) sens : res))

(le, []) nodes2check

formatResultsAux :: String -> [(String, String)] -> Element

formatResultsAux nm sens = unode nm $ unode "results" $

map (\ (n, e) -> unode "goal" [unode "name" n, unode "result" e]) sens

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

mkPath sess l k =

'/' : concat [ show (getLibId 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 "?"

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

sessAns libName svg (sess, k) =

let libEnv = sessLibEnv sess

ln = show $ getLibId libName

libref l =

aRef (mkPath sess l k) (show $ getLibId 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 htmlHead ++ mkHtmlElem

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

(bold ("library " ++ ln)

: map ref displayTypes

++ menuElement : loadXUpdate (libPath ++ "update")

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

: plain "commands:"

: mkUnorderedList (map ref globalCommands)

: plain "imported libraries:"

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

) ++ svg

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

getHetsLibContent opts dir query = do

let hlibs = libdirs opts

ds <- if null 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 :: String -> String -> Element

mkHtmlRef query entry = unode "dir" $ aRef (entry ++ 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 HetCASL specification in the text area and press \"submit\""

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

, uploadHtml ]

menuElement :: Element

menuElement = aRef "?menus" "menus"

htmlHead :: String

htmlHead =

let dtd = "PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\""

url = "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\""

in concat ["<!DOCTYPE html ", dtd, " ", url, ">\n"]

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 "xupdate"

, loadNode "xupdate"

, italic "impacts"

, loadNode "impacts"

, submitNode ]