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+{-# LANGUAGE OverloadedStrings #-}
+{- |
+ Module : Text.Pandoc.Readers.CslJson
+ Copyright : Copyright (C) 2020 John MacFarlane
+ License : GNU GPL, version 2 or above
+
+ Maintainer : John MacFarlane <jgm@berkeley.edu>
+ Stability : alpha
+ Portability : portable
+
+Parses CSL JSON 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.
+
+<https://citeproc-js.readthedocs.io/en/latest/csl-json/markup.html>.
+-}
+module Text.Pandoc.Readers.CslJson
+ ( readCslJson )
+where
+
+import Text.Pandoc.Options
+import Text.Pandoc.Definition
+import Text.Pandoc.Builder (setMeta, cite, str)
+import qualified Text.Pandoc.UTF8 as UTF8
+import Data.Text (Text)
+import qualified Data.Text as T
+import Text.Pandoc.Error (PandocError(..))
+import Text.Pandoc.Class (PandocMonad)
+import Text.Pandoc.Citeproc.CslJson (cslJsonToReferences)
+import Text.Pandoc.Citeproc.MetaValue (referenceToMetaValue)
+import Control.Monad.Except (throwError)
+
+-- | Read CSL JSON 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 `[@*]`.
+readCslJson :: PandocMonad m => ReaderOptions -> Text -> m Pandoc
+readCslJson _opts t =
+ case cslJsonToReferences (UTF8.fromText t) of
+ Left e -> throwError $ PandocParseError $ T.pack e
+ Right refs -> return $ setMeta "references"
+ (map referenceToMetaValue refs)
+ . setMeta "nocite"
+ (cite [Citation {citationId = "*"
+ , citationPrefix = []
+ , citationSuffix = []
+ , citationMode = NormalCitation
+ , citationNoteNum = 0
+ , citationHash = 0}]
+ (str "[@*]"))
+ $ Pandoc nullMeta []