module Codec.Xlsx.Parser
( toXlsx
) where
import qualified Codec.Archive.Zip as Zip
import Control.Applicative
import Control.Arrow ((&&&))
import Control.Monad (liftM4)
import Control.Monad.IO.Class()
import qualified Data.ByteString.Lazy as L
import Data.ByteString.Lazy.Char8()
import Data.IntMap (IntMap)
import qualified Data.IntMap as IM
import Data.List
import qualified Data.Map as M
import Data.Maybe
import Data.Ord
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.Read as T
import Data.XML.Types
import Prelude hiding (sequence)
import Text.XML as X
import Text.XML.Cursor
import Codec.Xlsx.Types
toXlsx :: L.ByteString -> Xlsx
toXlsx bs = Xlsx sheets styles
where
ar = Zip.toArchive bs
ss = getSharedStrings ar
styles = getStyles ar
wfs = getWorksheetFiles ar
sheets = M.fromList $ map (wfName &&& extractSheet ar ss) wfs
data WorksheetFile = WorksheetFile { wfName :: Text
, wfPath :: FilePath
}
deriving Show
decimal :: Monad m => Text -> m Int
decimal t = case T.decimal t of
Right (d, _) -> return d
_ -> fail "invalid decimal"
rational :: Monad m => Text -> m Double
rational t = case T.rational t of
Right (r, _) -> return r
_ -> fail "invalid rational"
extractSheet :: Zip.Archive
-> IM.IntMap Text
-> WorksheetFile
-> Worksheet
extractSheet ar ss wf = Worksheet cws rowProps cells merges
where
file = fromJust $ Zip.fromEntry <$> Zip.findEntryByPath (wfPath wf) ar
cur = case parseLBS def file of
Left _ -> error "could not read file"
Right d -> fromDocument d
cws = cur $/ element (n"cols") &/ element (n"col") >=>
liftM4 ColumnsWidth <$>
(attribute "min" >=> decimal) <*>
(attribute "max" >=> decimal) <*>
(attribute "width" >=> rational) <*>
(attribute "style" >=> decimal)
(rowProps, cells) = collect $ cur $/ element (n"sheetData") &/ element (n"row") >=> parseRow
parseRow c = do
r <- c $| attribute "r" >=> decimal
let ht = if attribute "customHeight" c == ["true"]
then listToMaybe $ c $| attribute "ht" >=> rational
else Nothing
let s = if attribute "s" c /= []
then listToMaybe $ c $| attribute "s" >=> decimal
else Nothing
let rp = if isNothing s && isNothing ht
then Nothing
else Just (RowProps ht s)
return (r, rp, c $/ element (n"c") >=> parseCell)
parseCell :: Cursor -> [(Int, Int, Cell)]
parseCell cell = do
let
s = listToMaybe $ cell $| attribute "s" >=> decimal
t = fromMaybe "n" $ listToMaybe $ cell $| attribute "t"
d = listToMaybe $ cell $/ element (n"v") &/ content >=> extractCellValue ss t
(c, r) <- T.span (>'9') <$> (cell $| attribute "r")
return (int r, col2int c, Cell s d)
collect = foldr collectRow (M.empty, M.empty)
collectRow (_, Nothing, rowCells) (rowMap, cellMap) =
(rowMap, foldr collectCell cellMap rowCells)
collectRow (r, Just h, rowCells) (rowMap, cellMap) =
(M.insert r h rowMap, foldr collectCell cellMap rowCells)
collectCell (x, y, cd) = M.insert (x,y) cd
merges = cur $/ parseMerges
parseMerges :: Cursor -> [Text]
parseMerges = element (n"mergeCells") &/ element (n"mergeCell") >=> parseMerge
parseMerge c = c $| attribute "ref"
extractCellValue :: IntMap Text -> Text -> Text -> [CellValue]
extractCellValue ss "s" v =
case T.decimal v of
Right (d, _) -> maybeToList $ fmap CellText $ IM.lookup d ss
_ -> []
extractCellValue _ "str" str = [CellText str]
extractCellValue _ "n" v =
case T.rational v of
Right (d, _) -> [CellDouble d]
_ -> []
extractCellValue _ "b" "1" = [CellBool True]
extractCellValue _ "b" "0" = [CellBool False]
extractCellValue _ _ _ = []
n :: Text -> Name
n x = Name
{ nameLocalName = x
, nameNamespace = Just "http://schemas.openxmlformats.org/spreadsheetml/2006/main"
, namePrefix = Nothing
}
odr :: Text -> Name
odr x = Name
{ nameLocalName = x
, nameNamespace = Just "http://schemas.openxmlformats.org/officeDocument/2006/relationships"
, namePrefix = Nothing
}
pr :: Text -> Name
pr x = Name
{ nameLocalName = x
, nameNamespace = Just "http://schemas.openxmlformats.org/package/2006/relationships"
, namePrefix = Nothing
}
xmlCursor :: Zip.Archive -> FilePath -> Maybe Cursor
xmlCursor ar fname = parse <$> Zip.findEntryByPath fname ar
where
parse entry = case parseLBS def (Zip.fromEntry entry) of
Left _ -> error "could not read file"
Right d -> fromDocument d
getSharedStrings :: Zip.Archive -> IM.IntMap Text
getSharedStrings x = case xmlCursor x "xl/sharedStrings.xml" of
Nothing -> IM.empty
Just c -> IM.fromAscList $ zip [0..] (c $/ element (n"si") &/ element (n"t") &/ content)
getStyles :: Zip.Archive -> Styles
getStyles ar = case Zip.fromEntry <$> Zip.findEntryByPath "xl/styles.xml" ar of
Nothing -> Styles L.empty
Just xml -> Styles xml
getWorksheetFiles :: Zip.Archive -> [WorksheetFile]
getWorksheetFiles ar = case xmlCursor ar "xl/workbook.xml" of
Nothing ->
error "invalid workbook"
Just c ->
let
sheetData = c $/ element (n"sheets") &/ element (n"sheet") >=>
liftA2 (,) <$> attribute "name" <*> attribute (odr"id")
wbRels = getWbRels ar
in [WorksheetFile name ("xl/" ++ T.unpack (fromJust $ lookup rId wbRels)) | (name, rId) <- sheetData]
getWbRels :: Zip.Archive -> [(Text, Text)]
getWbRels ar = case xmlCursor ar "xl/_rels/workbook.xml.rels" of
Nothing -> []
Just c -> c $/ element (pr"Relationship") >=>
liftA2 (,) <$> attribute "Id" <*> attribute "Target"
int :: Text -> Int
int = either error fst . T.decimal