aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Translations.hs
blob: 13dcb3b61e670c9809b49cf8d922580545e9e3a9 (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
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE CPP                        #-}
{-# LANGUAGE DeriveGeneric              #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-
Copyright (C) 2017-2018 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.Translations
   Copyright   : Copyright (C) 2017-2018 John MacFarlane
   License     : GNU GPL, version 2 or above

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

Data types for localization.

Translations are stored in @data/translations/langname.trans@,
where langname can be the full BCP47 language specifier, or
just the language part.  File format is:

> # A comment, ignored
> Figure: Figura
> Index: Indeksi

-}
module Text.Pandoc.Translations (
                           Term(..)
                         , Translations
                         , lookupTerm
                         , readTranslations
                         )
where
import Prelude
import Data.Aeson.Types (Value(..), FromJSON(..))
import qualified Data.Aeson.Types as Aeson
import qualified Data.HashMap.Strict as HM
import qualified Data.Map as M
import Data.Text as T
import qualified Data.YAML as YAML
import GHC.Generics (Generic)
import Text.Pandoc.Shared (safeRead)
import qualified Text.Pandoc.UTF8 as UTF8

data Term =
    Preface
  | References
  | Abstract
  | Bibliography
  | Chapter
  | Appendix
  | Contents
  | ListOfFigures
  | ListOfTables
  | Index
  | Figure
  | Table
  | Part
  | Page
  | See
  | SeeAlso
  | Encl
  | Cc
  | To
  | Proof
  | Glossary
  | Listing
  deriving (Show, Eq, Ord, Generic, Enum, Read)

newtype Translations = Translations (M.Map Term String)
        deriving (Show, Generic, Semigroup, Monoid)

instance FromJSON Term where
  parseJSON (String t) = case safeRead (T.unpack t) of
                               Just t' -> pure t'
                               Nothing -> fail $ "Invalid Term name " ++
                                                 show t
  parseJSON invalid = Aeson.typeMismatch "Term" invalid

instance YAML.FromYAML Term where
  parseYAML (YAML.Scalar (YAML.SStr t)) =
                         case safeRead (T.unpack t) of
                               Just t' -> pure t'
                               Nothing -> fail $ "Invalid Term name " ++
                                                 show t
  parseYAML invalid = YAML.typeMismatch "Term" invalid

instance FromJSON Translations where
  parseJSON (Object hm) = do
    xs <- mapM addItem (HM.toList hm)
    return $ Translations (M.fromList xs)
    where addItem (k,v) =
            case safeRead (T.unpack k) of
                 Nothing -> fail $ "Invalid Term name " ++ show k
                 Just t  ->
                   case v of
                        (String s) -> return (t, T.unpack $ T.strip s)
                        inv        -> Aeson.typeMismatch "String" inv
  parseJSON invalid = Aeson.typeMismatch "Translations" invalid

instance YAML.FromYAML Translations where
  parseYAML = YAML.withMap "Translations" $
    \tr -> Translations .M.fromList <$> mapM addItem (M.toList tr)
   where addItem (n@(YAML.Scalar (YAML.SStr k)), v) =
            case safeRead (T.unpack k) of
                 Nothing -> YAML.typeMismatch "Term" n
                 Just t  ->
                   case v of
                        (YAML.Scalar (YAML.SStr s)) ->
                          return (t, T.unpack (T.strip s))
                        n' -> YAML.typeMismatch "String" n'
         addItem (n, _) = YAML.typeMismatch "String" n

lookupTerm :: Term -> Translations -> Maybe String
lookupTerm t (Translations tm) = M.lookup t tm

readTranslations :: String -> Either String Translations
readTranslations s =
  case YAML.decodeStrict $ UTF8.fromString s of
       Left err'   -> Left err'
       Right (t:_) -> Right t
       Right []    -> Left "empty YAML document"