summaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/Custom.hs
blob: 72f443ed0c36824d3fc7218dd5ec591505a717b1 (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 DeriveDataTypeable   #-}
{-# LANGUAGE FlexibleInstances    #-}
{- Copyright (C) 2012-2017 John MacFarlane <jgm@berkeley.edu>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-}

{- |
   Module      : Text.Pandoc.Writers.Custom
   Copyright   : Copyright (C) 2012-2017 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 Control.Arrow ((***))
import Control.Exception
import Control.Monad (when)
import Control.Monad.Trans (MonadIO (liftIO))
import Data.Char (toLower)
import Data.List (intersperse)
import qualified Data.Map as M
import Data.Text (Text, pack)
import Data.Typeable
import Foreign.Lua (Lua, ToLuaStack (..), callFunc)
import Foreign.Lua.Api
import Text.Pandoc.Class (PandocIO)
import Text.Pandoc.Definition
import Text.Pandoc.Error
import Text.Pandoc.Lua.Init (runPandocLua)
import Text.Pandoc.Lua.StackInstances ()
import Text.Pandoc.Lua.Util (addValue, dostring')
import Text.Pandoc.Options
import Text.Pandoc.Templates
import qualified Text.Pandoc.UTF8 as UTF8
import Text.Pandoc.Writers.Shared

attrToMap :: Attr -> M.Map String String
attrToMap (id',classes,keyvals) = M.fromList
    $ ("id", id')
    : ("class", unwords classes)
    : keyvals

newtype Stringify a = Stringify a

instance ToLuaStack (Stringify Format) where
  push (Stringify (Format f)) = push (map toLower f)

instance ToLuaStack (Stringify [Inline]) where
  push (Stringify ils) = push =<< inlineListToCustom ils

instance ToLuaStack (Stringify [Block]) where
  push (Stringify blks) = push =<< blockListToCustom blks

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

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

data PandocLuaException = PandocLuaException String
    deriving (Show, Typeable)

instance Exception PandocLuaException

-- | Convert Pandoc to custom markup.
writeCustom :: FilePath -> WriterOptions -> Pandoc -> PandocIO Text
writeCustom luaFile opts doc@(Pandoc meta _) = do
  luaScript <- liftIO $ UTF8.readFile luaFile
  res <- runPandocLua $ do
    stat <- dostring' luaScript
    -- check for error in lua script (later we'll change the return type
    -- to handle this more gracefully):
    when (stat /= OK) $
      tostring 1 >>= throw . PandocLuaException . UTF8.toString
    call 0 0
  -- TODO - call hierarchicalize, so we have that info
    rendered <- docToCustom opts doc
    context <- metaToJSON opts
               blockListToCustom
               inlineListToCustom
               meta
    return (rendered, context)
  let (body, context) = case res of
        Left e -> throw (PandocLuaException (show e))
        Right x -> x
  case writerTemplate opts of
       Nothing  -> return $ pack body
       Just tpl ->
         case applyTemplate (pack tpl) $ setField "body" body context of
              Left e  -> throw (PandocTemplateError e)
              Right r -> return (pack r)

docToCustom :: WriterOptions -> Pandoc -> Lua String
docToCustom opts (Pandoc (Meta metamap) blocks) = do
  body <- blockListToCustom blocks
  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) = callFunc "Plain" (Stringify inlines)

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

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

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

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

blockToCustom HorizontalRule = callFunc "HorizontalRule"

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

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

blockToCustom (BlockQuote blocks) = 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 callFunc "Table" capt' aligns' widths headers' rows'

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

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

blockToCustom (DefinitionList items) =
  callFunc "DefinitionList" (map (Stringify *** map Stringify) items)

blockToCustom (Div attr items) =
  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 <- 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) = callFunc "Str" str

inlineToCustom Space = callFunc "Space"

inlineToCustom SoftBreak = callFunc "SoftBreak"

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

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

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

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

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

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

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

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

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

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

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

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

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

inlineToCustom LineBreak = callFunc "LineBreak"

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

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

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

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