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Diffstat (limited to 'src/Text/Pandoc/Lua/Marshal/ReaderOptions.hs')
| -rw-r--r-- | src/Text/Pandoc/Lua/Marshal/ReaderOptions.hs | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/Text/Pandoc/Lua/Marshal/ReaderOptions.hs b/src/Text/Pandoc/Lua/Marshal/ReaderOptions.hs new file mode 100644 index 000000000..c20770dba --- /dev/null +++ b/src/Text/Pandoc/Lua/Marshal/ReaderOptions.hs @@ -0,0 +1,133 @@ +{-# LANGUAGE LambdaCase #-} +{-# LANGUAGE OverloadedStrings #-} +{-# LANGUAGE ScopedTypeVariables #-} +{-# OPTIONS_GHC -fno-warn-orphans #-} +{- | + Module : Text.Pandoc.Lua.Marshaling.ReaderOptions + Copyright : © 2012-2021 John MacFarlane + © 2017-2021 Albert Krewinkel + License : GNU GPL, version 2 or above + + Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de> + Stability : alpha + +Marshaling instance for ReaderOptions and its components. +-} +module Text.Pandoc.Lua.Marshal.ReaderOptions + ( peekReaderOptions + , pushReaderOptions + , pushReaderOptionsReadonly + ) where + +import Data.Default (def) +import HsLua as Lua +import Text.Pandoc.Lua.Marshal.List (pushPandocList) +import Text.Pandoc.Options (ReaderOptions (..)) + +-- +-- Reader Options +-- + +-- | Retrieve a ReaderOptions value, either from a normal ReaderOptions +-- value, from a read-only object, or from a table with the same +-- keys as a ReaderOptions object. +peekReaderOptions :: LuaError e => Peeker e ReaderOptions +peekReaderOptions = retrieving "ReaderOptions" . \idx -> + liftLua (ltype idx) >>= \case + TypeUserdata -> choice [ peekUD typeReaderOptions + , peekUD typeReaderOptionsReadonly + ] + idx + TypeTable -> peekReaderOptionsTable idx + _ -> failPeek =<< + typeMismatchMessage "ReaderOptions userdata or table" idx + +-- | Pushes a ReaderOptions value as userdata object. +pushReaderOptions :: LuaError e => Pusher e ReaderOptions +pushReaderOptions = pushUD typeReaderOptions + +-- | Pushes a ReaderOptions object, but makes it read-only. +pushReaderOptionsReadonly :: LuaError e => Pusher e ReaderOptions +pushReaderOptionsReadonly = pushUD typeReaderOptionsReadonly + +-- | ReaderOptions object type for read-only values. +typeReaderOptionsReadonly :: LuaError e => DocumentedType e ReaderOptions +typeReaderOptionsReadonly = deftype "ReaderOptions (read-only)" + [ operation Tostring $ lambda + ### liftPure show + <#> udparam typeReaderOptions "opts" "options to print in native format" + =#> functionResult pushString "string" "Haskell representation" + , operation Newindex $ lambda + ### (failLua "This ReaderOptions value is read-only.") + =?> "Throws an error when called, i.e., an assignment is made." + ] + readerOptionsMembers + +-- | 'ReaderOptions' object type. +typeReaderOptions :: LuaError e => DocumentedType e ReaderOptions +typeReaderOptions = deftype "ReaderOptions" + [ operation Tostring $ lambda + ### liftPure show + <#> udparam typeReaderOptions "opts" "options to print in native format" + =#> functionResult pushString "string" "Haskell representation" + ] + readerOptionsMembers + +-- | Member properties of 'ReaderOptions' Lua values. +readerOptionsMembers :: LuaError e + => [Member e (DocumentedFunction e) ReaderOptions] +readerOptionsMembers = + [ property "abbreviations" "" + (pushSet pushText, readerAbbreviations) + (peekSet peekText, \opts x -> opts{ readerAbbreviations = x }) + , property "columns" "" + (pushIntegral, readerColumns) + (peekIntegral, \opts x -> opts{ readerColumns = x }) + , property "default_image_extension" "" + (pushText, readerDefaultImageExtension) + (peekText, \opts x -> opts{ readerDefaultImageExtension = x }) + , property "extensions" "" + (pushString . show, readerExtensions) + (peekRead, \opts x -> opts{ readerExtensions = x }) + , property "indented_code_classes" "" + (pushPandocList pushText, readerIndentedCodeClasses) + (peekList peekText, \opts x -> opts{ readerIndentedCodeClasses = x }) + , property "strip_comments" "" + (pushBool, readerStripComments) + (peekBool, \opts x -> opts{ readerStripComments = x }) + , property "standalone" "" + (pushBool, readerStandalone) + (peekBool, \opts x -> opts{ readerStandalone = x }) + , property "tab_stop" "" + (pushIntegral, readerTabStop) + (peekIntegral, \opts x -> opts{ readerTabStop = x }) + , property "track_changes" "" + (pushString . show, readerTrackChanges) + (peekRead, \opts x -> opts{ readerTrackChanges = x }) + ] + +-- | Retrieves a 'ReaderOptions' object from a table on the stack, using +-- the default values for all missing fields. +-- +-- Internally, this pushes the default reader options, sets each +-- key/value pair of the table in the userdata value, then retrieves the +-- object again. This will update all fields and complain about unknown +-- keys. +peekReaderOptionsTable :: LuaError e => Peeker e ReaderOptions +peekReaderOptionsTable idx = retrieving "ReaderOptions (table)" $ do + liftLua $ do + absidx <- absindex idx + pushUD typeReaderOptions def + let setFields = do + next absidx >>= \case + False -> return () -- all fields were copied + True -> do + pushvalue (nth 2) *> insert (nth 2) + settable (nth 4) -- set in userdata object + setFields + pushnil -- first key + setFields + peekUD typeReaderOptions top + +instance Pushable ReaderOptions where + push = pushReaderOptions |