Add RIS bibliography format reader.

New module, Text.Pandoc.Readers.RIS, exporting readRIS.

New input format `ris`.

Closes #7894.

MANUAL.txt

@@ -260,6 +260,7 @@ header when requesting a document from a URL:
     - `odt` ([ODT])
     - `opml` ([OPML])
     - `org` ([Emacs Org mode])
+    - `ris` ([RIS] bibliography)
     - `rtf` ([Rich Text Format])
     - `rst` ([reStructuredText])
     - `t2t` ([txt2tags])
@@ -487,6 +488,7 @@ header when requesting a document from a URL:
 [roff ms]: https://man.cx/groff_ms(7)
 [Haskell]: https://www.haskell.org
 [GNU Texinfo]: https://www.gnu.org/software/texinfo/
+[RIS]: https://en.wikipedia.org/wiki/RIS_(file_format)
 [Emacs Org mode]: https://orgmode.org
 [AsciiDoc]: https://www.methods.co.nz/asciidoc/
 [AsciiDoctor]: https://asciidoctor.org/

pandoc.cabal

@@ -547,6 +547,7 @@ library
                    Text.Pandoc.Readers.Creole,
                    Text.Pandoc.Readers.BibTeX,
                    Text.Pandoc.Readers.EndNote,
+                   Text.Pandoc.Readers.RIS,
                    Text.Pandoc.Readers.CslJson,
                    Text.Pandoc.Readers.MediaWiki,
                    Text.Pandoc.Readers.Vimwiki,

src/Text/Pandoc/App/FormatHeuristics.hs

@@ -69,6 +69,7 @@ formatFromFilePath x =
     ".org"      -> Just "org"
     ".pdf"      -> Just "pdf"  -- so we get an "unknown reader" error
     ".pptx"     -> Just "pptx"
+    ".ris"      -> Just "ris"
     ".roff"     -> Just "ms"
     ".rst"      -> Just "rst"
     ".rtf"      -> Just "rtf"

src/Text/Pandoc/Readers.hs

@@ -56,6 +56,7 @@ module Text.Pandoc.Readers
   , readBibTeX
   , readBibLaTeX
   , readEndNoteXML
+  , readRIS
   , readRTF
   -- * Miscellaneous
   , getReader
@@ -105,6 +106,7 @@ import Text.Pandoc.Readers.CSV
 import Text.Pandoc.Readers.CslJson
 import Text.Pandoc.Readers.BibTeX
 import Text.Pandoc.Readers.EndNote
+import Text.Pandoc.Readers.RIS
 import Text.Pandoc.Readers.RTF
 import qualified Text.Pandoc.UTF8 as UTF8
 import Text.Pandoc.Sources (ToSources(..), sourcesToText)
@@ -154,6 +156,7 @@ readers = [("native"       , TextReader readNative)
           ,("bibtex"       , TextReader readBibTeX)
           ,("biblatex"     , TextReader readBibLaTeX)
           ,("endnotexml"   , TextReader readEndNoteXML)
+          ,("ris"          , TextReader readRIS)
           ,("rtf"          , TextReader readRTF)
            ]
 

src/Text/Pandoc/Readers/RIS.hs

@@ -0,0 +1,250 @@
+{-# LANGUAGE OverloadedStrings #-}
+{- |
+   Module      : Text.Pandoc.Readers.RIS
+   Copyright   : Copyright (C) 2022 John MacFarlane
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : John MacFarlane <jgm@berkeley.edu>
+   Stability   : alpha
+   Portability : portable
+
+Parses RIS bibliographies into a Pandoc document
+with empty body and `references` and `nocite` fields
+in the metadata.  A wildcard `nocite` is used so that
+if the document is rendered in another format, the
+entire bibliography will be printed.
+-}
+module Text.Pandoc.Readers.RIS
+  ( readRIS
+  )
+where
+
+import Text.Pandoc.Options
+import Text.Pandoc.Definition
+import Text.Pandoc.Parsing
+import Data.Char (isAsciiUpper, isDigit, isSpace, ord, chr)
+import Data.List (foldl')
+import Citeproc (Reference(..), ItemId(..), Val(..), Date(..), DateParts(..),
+                 toVariable)
+import Text.Pandoc.Builder as B
+import Text.Pandoc.Class (PandocMonad)
+import Text.Pandoc.Citeproc.MetaValue (referenceToMetaValue)
+import Text.Pandoc.Citeproc.BibTeX (toName)
+import Control.Monad.Except (throwError)
+import qualified Data.Text as T
+import Data.Text (Text)
+import Data.Maybe (fromMaybe)
+import qualified Data.Map as M
+import Safe (readMay)
+
+-- | Read RIS from an input string and return a Pandoc document.
+-- The document will have only metadata, with an empty body.
+-- The metadata will contain a `references` field with the
+-- bibliography entries, and a `nocite` field with the wildcard `[@*]`.
+readRIS :: (PandocMonad m, ToSources a)
+        => ReaderOptions -> a -> m Pandoc
+readRIS _opts inp = do
+  parsed <- readWithM risReferences () inp
+  case parsed of
+    Right refs -> do
+      refs' <- mapM (traverse (return . text)) refs
+      return $
+        setMeta "nocite" (cite [Citation {citationId = "*"
+                                         , citationPrefix = []
+                                         , citationSuffix = []
+                                         , citationMode = NormalCitation
+                                         , citationNoteNum = 0
+                                         , citationHash = 0}] (str "[@*]")) $
+        setMeta "references" (map referenceToMetaValue refs') $
+        B.doc mempty
+    Left e       -> throwError e
+
+type RISParser m = ParserT Sources () m
+
+risLine :: PandocMonad m => RISParser m (Text, Text)
+risLine = do
+  key <- T.pack <$> count 2 (satisfy (\c -> isAsciiUpper c || isDigit c))
+  _ <- many1 spaceChar
+  char '-'
+  _ <- many1 spaceChar
+  val <- anyLine
+  return (key, T.strip val)
+
+risSeparator :: PandocMonad m => RISParser m ()
+risSeparator = do
+  try $ string "ER"
+  _ <- many1 spaceChar
+  char '-'
+  _ <- anyLine
+  return ()
+
+risRecord :: PandocMonad m => RISParser m [(Text, Text)]
+risRecord = manyTill risLine risSeparator
+
+risRecordToReference :: [(Text, Text)] -> Reference Text
+risRecordToReference keys = addId $ foldr go defref keys
+ where
+   go (key, val) =
+     case key of
+       "TY" -> \ref -> ref{ referenceType =
+          fromMaybe "misc" (M.lookup val risTypes) }
+       "VL" -> addVar "volume" val
+       "KW" -> \ref ->
+         ref{ referenceVariables =
+               M.alter (\x -> case x of
+                           Nothing -> Just $ TextVal val
+                           Just (TextVal kws)
+                                   -> Just (TextVal (kws <> ", " <> val))
+                           _ -> x)
+               "keyword"
+               (referenceVariables ref) }
+       "PB" -> addVar "publisher" val
+       "PP" -> addVar "publisher-place" val
+       "SP" -> \ref ->
+         case M.lookup "page" (referenceVariables ref) of
+           Nothing -> addVar "page" val ref
+           Just (FancyVal eg) -> addVar "page" (val <> eg) ref
+           _ -> ref
+       "EP" -> \ref ->
+         case M.lookup "page" (referenceVariables ref) of
+           Nothing -> addVar "page" ("-" <> val) ref
+           Just (FancyVal eg) -> addVar "page" (val <> "-" <> eg) ref
+           _ -> ref
+       "AU" -> addName "author" val
+       "A1" -> addName "author" val
+       "ED" -> addName "editor" val
+       "A2" -> addName "editor" val
+       "TI" -> addVar "title" val
+       "T1" -> addVar "title" val
+       "CT" -> addVar "title" val
+       "BT" -> \ref ->
+         if referenceType ref == "book"
+            then addVar "title" val ref
+            else addVar "container-title" val ref
+       "JO" -> addVar "container-title" val
+       "JF" -> addVar "container-title" val
+       "T2" -> addVar "container-title" val
+       "ET" -> addVar "edition" val
+       "NV" -> addVar "number-of-volumes" val
+       "AB" -> addVar "abstract" val
+       "PY" -> addYear "issued" val
+       "Y1" -> addYear "issued" val
+       "IS" -> addVar "issue" val
+       "SN" -> addVar "ISSN" val
+       "LA" -> addVar "language" val
+       "UR" -> addVar "url" val
+       "LK" -> addVar "url" val
+       _ -> id -- TODO
+   addVar k v r = r{ referenceVariables =
+                       M.insert (toVariable k) (FancyVal v)
+                       (referenceVariables r) }
+   addName k v r =
+     let new = toName [] . B.toList .  B.text $ v
+         f Nothing   = Just (NamesVal new)
+         f (Just (NamesVal ns)) = Just (NamesVal (ns ++ new))
+         f (Just x) = Just x
+      in r{ referenceVariables =
+              M.alter f k (referenceVariables r) }
+   addYear k v r =
+     let d = DateVal $
+              case readMay (T.unpack v) of
+                Nothing ->
+                  Date { dateParts = []
+                       , dateCirca = False
+                       , dateSeason = Nothing
+                       , dateLiteral = Just v }
+                Just y ->
+                  Date { dateParts = [DateParts [y]]
+                       , dateCirca = False
+                       , dateSeason = Nothing
+                       , dateLiteral = Nothing }
+      in r{ referenceVariables = M.insert k d (referenceVariables r) }
+
+   defref = Reference{
+       referenceId = mempty
+     , referenceType = mempty
+     , referenceDisambiguation = Nothing
+     , referenceVariables = mempty }
+   addId rec = rec{ referenceId = ItemId (authors <> pubdate) }
+   authors = T.intercalate "_" $
+               [T.takeWhile (\c -> c /= ',' && not (isSpace c)) n
+                 | (k, n) <- keys, k == "AU" || k == "A1"]
+   pubdate = mconcat ["_" <> d | (k, d) <- keys, k == "PY" || k == "Y1"]
+
+risReferences :: PandocMonad m => RISParser m [Reference Text]
+risReferences = do
+  recs <- many risRecord
+  spaces
+  eof
+  return $ fixDuplicateIds $ map risRecordToReference recs
+
+fixDuplicateIds :: [Reference Text] -> [Reference Text]
+fixDuplicateIds = reverse . snd . foldl' go (mempty, [])
+ where
+   go (ids_seen, refs) ref =
+     case M.lookup (referenceId ref) ids_seen of
+       Nothing -> (M.insert (referenceId ref) (ord 'a') ids_seen, ref:refs)
+       Just n  -> (M.insert (referenceId ref) (n+1) ids_seen,
+                     ref{ referenceId =
+                          ItemId . (<> T.singleton (chr n)) . unItemId $
+                           referenceId ref }
+                    : refs)
+
+risTypes :: M.Map Text Text
+risTypes = M.fromList
+    [ ("ABST", "article")
+    , ("ADVS", "motion-picture")
+    , ("AGGR", "dataset")
+    , ("ANCIENT", "book")
+    , ("ART", "graphic")
+    , ("BILL", "bill")
+    , ("BLOG", "post-weblog")
+    , ("BOOK", "book")
+    , ("CASE", "legal_case")
+    , ("CHAP", "chapter")
+    , ("CHART", "graphic")
+    , ("CLSWK", "book")
+    , ("COMP", "program")
+    , ("CONF", "paper-conference")
+    , ("CPAPER", "paper-conference")
+    , ("CTLG", "catalog")
+    , ("DATA", "dataset")
+    , ("DBASE", "dataset")
+    , ("DICT", "book")
+    , ("EBOOK", "book")
+    , ("ECHAP", "chapter")
+    , ("EDBOOK", "book")
+    , ("EJOUR", "article")
+    , ("WEB", "webpage")
+    , ("ENCYC", "entry-encyclopedia")
+    , ("EQUA", "figure")
+    , ("FIGURE", "figure")
+    , ("GEN", "entry")
+    , ("GOVDOC", "report")
+    , ("GRANT", "report")
+    , ("HEAR", "report")
+    , ("ICOMM", "personal_communication")
+    , ("INPR", "article-journal")
+    , ("JFULL", "article-journal")
+    , ("JOUR", "article-journal")
+    , ("LEGAL", "legal_case")
+    , ("MANSCPT", "manuscript")
+    , ("MAP", "map")
+    , ("MGZN", "article-magazine")
+    , ("MPCT", "motion-picture")
+    , ("MULTI", "webpage")
+    , ("MUSIC", "musical_score")
+    , ("NEWS", "article-newspaper")
+    , ("PAMP", "pamphlet")
+    , ("PAT", "patent")
+    , ("PCOMM", "personal_communication")
+    , ("RPRT", "report")
+    , ("SER", "article")
+    , ("SLIDE", "graphic")
+    , ("SOUND", "musical_score")
+    , ("STAND", "report")
+    , ("STAT", "legislation")
+    , ("THES", "thesis")
+    , ("UNBILL", "bill")
+    , ("UNPB", "unpublished")
+    , ("VIDEO", "graphic") ]