aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/Custom.hs
blob: 733b29ac77dcdafba0527df2706299587450c491 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
{-# LANGUAGE FlexibleInstances  #-}
{-# LANGUAGE NoImplicitPrelude  #-}
{-# LANGUAGE OverloadedStrings  #-}
{- |
   Module      : Text.Pandoc.Writers.Custom
   Copyright   : Copyright (C) 2012-2019 John MacFarlane
   License     : GNU GPL, version 2 or above

   Maintainer  : John MacFarlane <jgm@berkeley.edu>
   Stability   : alpha
   Portability : portable

Conversion of 'Pandoc' documents to custom markup using
a lua writer.
-}
module Text.Pandoc.Writers.Custom ( writeCustom ) where
import Prelude
import Control.Arrow ((***))
import Control.Exception
import Control.Monad (when)
import Data.List (intersperse)
import qualified Data.Map as M
import qualified Data.Text as T
import Data.Text (Text, pack)
import Data.Typeable
import Foreign.Lua (Lua, Pushable)
import Text.DocLayout (render, literal)
import Text.Pandoc.Class (PandocIO)
import Text.Pandoc.Definition
import Text.Pandoc.Lua (Global (..), LuaException (LuaException),
                        runLua, setGlobals)
import Text.Pandoc.Lua.Util (addField, dofileWithTraceback)
import Text.Pandoc.Options
import Text.Pandoc.Templates (renderTemplate)
import qualified Text.Pandoc.UTF8 as UTF8
import Text.Pandoc.Writers.Shared

import qualified Foreign.Lua as Lua

attrToMap :: Attr -> M.Map T.Text T.Text
attrToMap (id',classes,keyvals) = M.fromList
    $ ("id", id')
    : ("class", T.unwords classes)
    : keyvals

newtype Stringify a = Stringify a

instance Pushable (Stringify Format) where
  push (Stringify (Format f)) = Lua.push (T.toLower f)

instance Pushable (Stringify [Inline]) where
  push (Stringify ils) = Lua.push =<< inlineListToCustom ils

instance Pushable (Stringify [Block]) where
  push (Stringify blks) = Lua.push =<< blockListToCustom blks

instance Pushable (Stringify MetaValue) where
  push (Stringify (MetaMap m))       = Lua.push (fmap Stringify m)
  push (Stringify (MetaList xs))     = Lua.push (map Stringify xs)
  push (Stringify (MetaBool x))      = Lua.push x
  push (Stringify (MetaString s))    = Lua.push s
  push (Stringify (MetaInlines ils)) = Lua.push (Stringify ils)
  push (Stringify (MetaBlocks bs))   = Lua.push (Stringify bs)

instance Pushable (Stringify Citation) where
  push (Stringify cit) = do
    Lua.createtable 6 0
    addField "citationId" $ citationId cit
    addField "citationPrefix" . Stringify $ citationPrefix cit
    addField "citationSuffix" . Stringify $ citationSuffix cit
    addField "citationMode" $ show (citationMode cit)
    addField "citationNoteNum" $ citationNoteNum cit
    addField "citationHash" $ citationHash cit

-- | Key-value pair, pushed as a table with @a@ as the only key and @v@ as the
-- associated value.
newtype KeyValue a b = KeyValue (a, b)

instance (Pushable a, Pushable b) => Pushable (KeyValue a b) where
  push (KeyValue (k, v)) = do
    Lua.newtable
    Lua.push k
    Lua.push v
    Lua.rawset (Lua.nthFromTop 3)

data PandocLuaException = PandocLuaException Text
    deriving (Show, Typeable)

instance Exception PandocLuaException

-- | Convert Pandoc to custom markup.
writeCustom :: FilePath -> WriterOptions -> Pandoc -> PandocIO Text
writeCustom luaFile opts doc@(Pandoc meta _) = do
  let globals = [ PANDOC_DOCUMENT doc
                , PANDOC_SCRIPT_FILE luaFile
                ]
  res <- runLua $ do
    setGlobals globals
    stat <- dofileWithTraceback luaFile
    -- check for error in lua script (later we'll change the return type
    -- to handle this more gracefully):
    when (stat /= Lua.OK) $
      Lua.tostring' (-1) >>= throw . PandocLuaException . UTF8.toText
    rendered <- docToCustom opts doc
    context <- metaToContext opts
               (fmap (literal . pack) . blockListToCustom)
               (fmap (literal . pack) . inlineListToCustom)
               meta
    return (pack rendered, context)
  let (body, context) = case res of
        Left (LuaException msg) -> throw (PandocLuaException msg)
        Right x -> x
  return $
    case writerTemplate opts of
       Nothing  -> body
       Just tpl -> render Nothing $
                    renderTemplate tpl $ setField "body" body context

docToCustom :: WriterOptions -> Pandoc -> Lua String
docToCustom opts (Pandoc (Meta metamap) blocks) = do
  body <- blockListToCustom blocks
  Lua.callFunc "Doc" body (fmap Stringify metamap) (writerVariables opts)

-- | Convert Pandoc block element to Custom.
blockToCustom :: Block         -- ^ Block element
              -> Lua String

blockToCustom Null = return ""

blockToCustom (Plain inlines) = Lua.callFunc "Plain" (Stringify inlines)

blockToCustom (Para [Image attr txt (src,tit)]) =
  Lua.callFunc "CaptionedImage" src tit (Stringify txt) (attrToMap attr)

blockToCustom (Para inlines) = Lua.callFunc "Para" (Stringify inlines)

blockToCustom (LineBlock linesList) =
  Lua.callFunc "LineBlock" (map Stringify linesList)

blockToCustom (RawBlock format str) =
  Lua.callFunc "RawBlock" (Stringify format) str

blockToCustom HorizontalRule = Lua.callFunc "HorizontalRule"

blockToCustom (Header level attr inlines) =
  Lua.callFunc "Header" level (Stringify inlines) (attrToMap attr)

blockToCustom (CodeBlock attr str) =
  Lua.callFunc "CodeBlock" str (attrToMap attr)

blockToCustom (BlockQuote blocks) =
  Lua.callFunc "BlockQuote" (Stringify blocks)

blockToCustom (Table capt aligns widths headers rows) =
  let aligns' = map show aligns
      capt' = Stringify capt
      headers' = map Stringify headers
      rows' = map (map Stringify) rows
  in Lua.callFunc "Table" capt' aligns' widths headers' rows'

blockToCustom (BulletList items) =
  Lua.callFunc "BulletList" (map Stringify items)

blockToCustom (OrderedList (num,sty,delim) items) =
  Lua.callFunc "OrderedList" (map Stringify items) num (show sty) (show delim)

blockToCustom (DefinitionList items) =
  Lua.callFunc "DefinitionList"
               (map (KeyValue . (Stringify *** map Stringify)) items)

blockToCustom (Div attr items) =
  Lua.callFunc "Div" (Stringify items) (attrToMap attr)

-- | Convert list of Pandoc block elements to Custom.
blockListToCustom :: [Block]       -- ^ List of block elements
                  -> Lua String
blockListToCustom xs = do
  blocksep <- Lua.callFunc "Blocksep"
  bs <- mapM blockToCustom xs
  return $ mconcat $ intersperse blocksep bs

-- | Convert list of Pandoc inline elements to Custom.
inlineListToCustom :: [Inline] -> Lua String
inlineListToCustom lst = do
  xs <- mapM inlineToCustom lst
  return $ mconcat xs

-- | Convert Pandoc inline element to Custom.
inlineToCustom :: Inline -> Lua String

inlineToCustom (Str str) = Lua.callFunc "Str" str

inlineToCustom Space = Lua.callFunc "Space"

inlineToCustom SoftBreak = Lua.callFunc "SoftBreak"

inlineToCustom (Emph lst) = Lua.callFunc "Emph" (Stringify lst)

inlineToCustom (Strong lst) = Lua.callFunc "Strong" (Stringify lst)

inlineToCustom (Strikeout lst) = Lua.callFunc "Strikeout" (Stringify lst)

inlineToCustom (Superscript lst) = Lua.callFunc "Superscript" (Stringify lst)

inlineToCustom (Subscript lst) = Lua.callFunc "Subscript" (Stringify lst)

inlineToCustom (SmallCaps lst) = Lua.callFunc "SmallCaps" (Stringify lst)

inlineToCustom (Quoted SingleQuote lst) = Lua.callFunc "SingleQuoted" (Stringify lst)

inlineToCustom (Quoted DoubleQuote lst) = Lua.callFunc "DoubleQuoted" (Stringify lst)

inlineToCustom (Cite cs lst) = Lua.callFunc "Cite" (Stringify lst) (map Stringify cs)

inlineToCustom (Code attr str) =
  Lua.callFunc "Code" str (attrToMap attr)

inlineToCustom (Math DisplayMath str) =
  Lua.callFunc "DisplayMath" str

inlineToCustom (Math InlineMath str) =
  Lua.callFunc "InlineMath" str

inlineToCustom (RawInline format str) =
  Lua.callFunc "RawInline" (Stringify format) str

inlineToCustom LineBreak = Lua.callFunc "LineBreak"

inlineToCustom (Link attr txt (src,tit)) =
  Lua.callFunc "Link" (Stringify txt) src tit (attrToMap attr)

inlineToCustom (Image attr alt (src,tit)) =
  Lua.callFunc "Image" (Stringify alt) src tit (attrToMap attr)

inlineToCustom (Note contents) = Lua.callFunc "Note" (Stringify contents)

inlineToCustom (Span attr items) =
  Lua.callFunc "Span" (Stringify items) (attrToMap attr)