root / htools / Ganeti / THH.hs @ 37904802
History | View | Annotate | Download (38.7 kB)
1 | a1505857 | Iustin Pop | {-# LANGUAGE TemplateHaskell #-} |
---|---|---|---|
2 | e9aaa3c6 | Iustin Pop | |
3 | 18049dad | Iustin Pop | {-| TemplateHaskell helper for Ganeti Haskell code. |
4 | e9aaa3c6 | Iustin Pop | |
5 | e9aaa3c6 | Iustin Pop | As TemplateHaskell require that splices be defined in a separate |
6 | e9aaa3c6 | Iustin Pop | module, we combine all the TemplateHaskell functionality that HTools |
7 | e9aaa3c6 | Iustin Pop | needs in this module (except the one for unittests). |
8 | e9aaa3c6 | Iustin Pop | |
9 | e9aaa3c6 | Iustin Pop | -} |
10 | e9aaa3c6 | Iustin Pop | |
11 | e9aaa3c6 | Iustin Pop | {- |
12 | e9aaa3c6 | Iustin Pop | |
13 | b1e81520 | Iustin Pop | Copyright (C) 2011, 2012 Google Inc. |
14 | e9aaa3c6 | Iustin Pop | |
15 | e9aaa3c6 | Iustin Pop | This program is free software; you can redistribute it and/or modify |
16 | e9aaa3c6 | Iustin Pop | it under the terms of the GNU General Public License as published by |
17 | e9aaa3c6 | Iustin Pop | the Free Software Foundation; either version 2 of the License, or |
18 | e9aaa3c6 | Iustin Pop | (at your option) any later version. |
19 | e9aaa3c6 | Iustin Pop | |
20 | e9aaa3c6 | Iustin Pop | This program is distributed in the hope that it will be useful, but |
21 | e9aaa3c6 | Iustin Pop | WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | e9aaa3c6 | Iustin Pop | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
23 | e9aaa3c6 | Iustin Pop | General Public License for more details. |
24 | e9aaa3c6 | Iustin Pop | |
25 | e9aaa3c6 | Iustin Pop | You should have received a copy of the GNU General Public License |
26 | e9aaa3c6 | Iustin Pop | along with this program; if not, write to the Free Software |
27 | e9aaa3c6 | Iustin Pop | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
28 | e9aaa3c6 | Iustin Pop | 02110-1301, USA. |
29 | e9aaa3c6 | Iustin Pop | |
30 | e9aaa3c6 | Iustin Pop | -} |
31 | e9aaa3c6 | Iustin Pop | |
32 | b20cbf06 | Iustin Pop | module Ganeti.THH ( declareSADT |
33 | 260d0bda | Agata Murawska | , declareIADT |
34 | e9aaa3c6 | Iustin Pop | , makeJSONInstance |
35 | 6111e296 | Iustin Pop | , genOpID |
36 | 471b6c46 | Iustin Pop | , genAllConstr |
37 | a583ec5d | Iustin Pop | , genAllOpIDs |
38 | 12c19659 | Iustin Pop | , genOpCode |
39 | a0090487 | Agata Murawska | , genStrOfOp |
40 | a0090487 | Agata Murawska | , genStrOfKey |
41 | a0090487 | Agata Murawska | , genLuxiOp |
42 | 879273e3 | Iustin Pop | , Field |
43 | 879273e3 | Iustin Pop | , simpleField |
44 | 879273e3 | Iustin Pop | , defaultField |
45 | 879273e3 | Iustin Pop | , optionalField |
46 | 9b156883 | Iustin Pop | , optionalNullSerField |
47 | 879273e3 | Iustin Pop | , renameField |
48 | 879273e3 | Iustin Pop | , customField |
49 | 879273e3 | Iustin Pop | , timeStampFields |
50 | 879273e3 | Iustin Pop | , uuidFields |
51 | 879273e3 | Iustin Pop | , serialFields |
52 | 02cccecd | Iustin Pop | , tagsFields |
53 | 9924d61e | Iustin Pop | , TagSet |
54 | 879273e3 | Iustin Pop | , buildObject |
55 | 879273e3 | Iustin Pop | , buildObjectSerialisation |
56 | 879273e3 | Iustin Pop | , buildParam |
57 | 2af78b97 | Iustin Pop | , DictObject(..) |
58 | ef3ad027 | Iustin Pop | , genException |
59 | ef3ad027 | Iustin Pop | , excErrMsg |
60 | e9aaa3c6 | Iustin Pop | ) where |
61 | e9aaa3c6 | Iustin Pop | |
62 | 4b71f30c | Iustin Pop | import Control.Monad (liftM) |
63 | e9aaa3c6 | Iustin Pop | import Data.Char |
64 | 6111e296 | Iustin Pop | import Data.List |
65 | 12e8358c | Iustin Pop | import Data.Maybe (fromMaybe) |
66 | 02cccecd | Iustin Pop | import qualified Data.Set as Set |
67 | e9aaa3c6 | Iustin Pop | import Language.Haskell.TH |
68 | e9aaa3c6 | Iustin Pop | |
69 | e9aaa3c6 | Iustin Pop | import qualified Text.JSON as JSON |
70 | ef3ad027 | Iustin Pop | import Text.JSON.Pretty (pp_value) |
71 | e9aaa3c6 | Iustin Pop | |
72 | 879273e3 | Iustin Pop | -- * Exported types |
73 | 879273e3 | Iustin Pop | |
74 | 2af78b97 | Iustin Pop | -- | Class of objects that can be converted to 'JSObject' |
75 | 2af78b97 | Iustin Pop | -- lists-format. |
76 | 2af78b97 | Iustin Pop | class DictObject a where |
77 | 2af78b97 | Iustin Pop | toDict :: a -> [(String, JSON.JSValue)] |
78 | 2af78b97 | Iustin Pop | |
79 | 9b156883 | Iustin Pop | -- | Optional field information. |
80 | 9b156883 | Iustin Pop | data OptionalType |
81 | 9b156883 | Iustin Pop | = NotOptional -- ^ Field is not optional |
82 | 9b156883 | Iustin Pop | | OptionalOmitNull -- ^ Field is optional, null is not serialised |
83 | 9b156883 | Iustin Pop | | OptionalSerializeNull -- ^ Field is optional, null is serialised |
84 | 9b156883 | Iustin Pop | deriving (Show, Eq) |
85 | 9b156883 | Iustin Pop | |
86 | 879273e3 | Iustin Pop | -- | Serialised field data type. |
87 | 879273e3 | Iustin Pop | data Field = Field { fieldName :: String |
88 | 879273e3 | Iustin Pop | , fieldType :: Q Type |
89 | 879273e3 | Iustin Pop | , fieldRead :: Maybe (Q Exp) |
90 | 879273e3 | Iustin Pop | , fieldShow :: Maybe (Q Exp) |
91 | 879273e3 | Iustin Pop | , fieldDefault :: Maybe (Q Exp) |
92 | 879273e3 | Iustin Pop | , fieldConstr :: Maybe String |
93 | 9b156883 | Iustin Pop | , fieldIsOptional :: OptionalType |
94 | 879273e3 | Iustin Pop | } |
95 | 879273e3 | Iustin Pop | |
96 | 879273e3 | Iustin Pop | -- | Generates a simple field. |
97 | 879273e3 | Iustin Pop | simpleField :: String -> Q Type -> Field |
98 | 879273e3 | Iustin Pop | simpleField fname ftype = |
99 | 879273e3 | Iustin Pop | Field { fieldName = fname |
100 | 879273e3 | Iustin Pop | , fieldType = ftype |
101 | 879273e3 | Iustin Pop | , fieldRead = Nothing |
102 | 879273e3 | Iustin Pop | , fieldShow = Nothing |
103 | 879273e3 | Iustin Pop | , fieldDefault = Nothing |
104 | 879273e3 | Iustin Pop | , fieldConstr = Nothing |
105 | 9b156883 | Iustin Pop | , fieldIsOptional = NotOptional |
106 | 879273e3 | Iustin Pop | } |
107 | 879273e3 | Iustin Pop | |
108 | 879273e3 | Iustin Pop | -- | Sets the renamed constructor field. |
109 | 879273e3 | Iustin Pop | renameField :: String -> Field -> Field |
110 | 879273e3 | Iustin Pop | renameField constrName field = field { fieldConstr = Just constrName } |
111 | 879273e3 | Iustin Pop | |
112 | 879273e3 | Iustin Pop | -- | Sets the default value on a field (makes it optional with a |
113 | 879273e3 | Iustin Pop | -- default value). |
114 | 879273e3 | Iustin Pop | defaultField :: Q Exp -> Field -> Field |
115 | 879273e3 | Iustin Pop | defaultField defval field = field { fieldDefault = Just defval } |
116 | 879273e3 | Iustin Pop | |
117 | 879273e3 | Iustin Pop | -- | Marks a field optional (turning its base type into a Maybe). |
118 | 879273e3 | Iustin Pop | optionalField :: Field -> Field |
119 | 9b156883 | Iustin Pop | optionalField field = field { fieldIsOptional = OptionalOmitNull } |
120 | 9b156883 | Iustin Pop | |
121 | 9b156883 | Iustin Pop | -- | Marks a field optional (turning its base type into a Maybe), but |
122 | 9b156883 | Iustin Pop | -- with 'Nothing' serialised explicitly as /null/. |
123 | 9b156883 | Iustin Pop | optionalNullSerField :: Field -> Field |
124 | 9b156883 | Iustin Pop | optionalNullSerField field = field { fieldIsOptional = OptionalSerializeNull } |
125 | 879273e3 | Iustin Pop | |
126 | 879273e3 | Iustin Pop | -- | Sets custom functions on a field. |
127 | c2e60027 | Iustin Pop | customField :: Name -- ^ The name of the read function |
128 | c2e60027 | Iustin Pop | -> Name -- ^ The name of the show function |
129 | c2e60027 | Iustin Pop | -> Field -- ^ The original field |
130 | c2e60027 | Iustin Pop | -> Field -- ^ Updated field |
131 | 879273e3 | Iustin Pop | customField readfn showfn field = |
132 | c2e60027 | Iustin Pop | field { fieldRead = Just (varE readfn), fieldShow = Just (varE showfn) } |
133 | 879273e3 | Iustin Pop | |
134 | 12e8358c | Iustin Pop | -- | Computes the record name for a given field, based on either the |
135 | 12e8358c | Iustin Pop | -- string value in the JSON serialisation or the custom named if any |
136 | 12e8358c | Iustin Pop | -- exists. |
137 | 879273e3 | Iustin Pop | fieldRecordName :: Field -> String |
138 | 879273e3 | Iustin Pop | fieldRecordName (Field { fieldName = name, fieldConstr = alias }) = |
139 | 12e8358c | Iustin Pop | fromMaybe (camelCase name) alias |
140 | 879273e3 | Iustin Pop | |
141 | a1505857 | Iustin Pop | -- | Computes the preferred variable name to use for the value of this |
142 | a1505857 | Iustin Pop | -- field. If the field has a specific constructor name, then we use a |
143 | a1505857 | Iustin Pop | -- first-letter-lowercased version of that; otherwise, we simply use |
144 | a1505857 | Iustin Pop | -- the field name. See also 'fieldRecordName'. |
145 | 879273e3 | Iustin Pop | fieldVariable :: Field -> String |
146 | a1505857 | Iustin Pop | fieldVariable f = |
147 | a1505857 | Iustin Pop | case (fieldConstr f) of |
148 | a1505857 | Iustin Pop | Just name -> ensureLower name |
149 | d8cb8e13 | Iustin Pop | _ -> map (\c -> if c == '-' then '_' else c) $ fieldName f |
150 | 879273e3 | Iustin Pop | |
151 | 9b156883 | Iustin Pop | -- | Compute the actual field type (taking into account possible |
152 | 9b156883 | Iustin Pop | -- optional status). |
153 | 879273e3 | Iustin Pop | actualFieldType :: Field -> Q Type |
154 | 9b156883 | Iustin Pop | actualFieldType f | fieldIsOptional f /= NotOptional = [t| Maybe $t |] |
155 | 879273e3 | Iustin Pop | | otherwise = t |
156 | 879273e3 | Iustin Pop | where t = fieldType f |
157 | 879273e3 | Iustin Pop | |
158 | 9b156883 | Iustin Pop | -- | Checks that a given field is not optional (for object types or |
159 | 9b156883 | Iustin Pop | -- fields which should not allow this case). |
160 | 879273e3 | Iustin Pop | checkNonOptDef :: (Monad m) => Field -> m () |
161 | 9b156883 | Iustin Pop | checkNonOptDef (Field { fieldIsOptional = OptionalOmitNull |
162 | 9b156883 | Iustin Pop | , fieldName = name }) = |
163 | 9b156883 | Iustin Pop | fail $ "Optional field " ++ name ++ " used in parameter declaration" |
164 | 9b156883 | Iustin Pop | checkNonOptDef (Field { fieldIsOptional = OptionalSerializeNull |
165 | 9b156883 | Iustin Pop | , fieldName = name }) = |
166 | 879273e3 | Iustin Pop | fail $ "Optional field " ++ name ++ " used in parameter declaration" |
167 | 879273e3 | Iustin Pop | checkNonOptDef (Field { fieldDefault = (Just _), fieldName = name }) = |
168 | 879273e3 | Iustin Pop | fail $ "Default field " ++ name ++ " used in parameter declaration" |
169 | 879273e3 | Iustin Pop | checkNonOptDef _ = return () |
170 | 879273e3 | Iustin Pop | |
171 | 1c7bda0a | Iustin Pop | -- | Produces the expression that will de-serialise a given |
172 | 1c7bda0a | Iustin Pop | -- field. Since some custom parsing functions might need to use the |
173 | 1c7bda0a | Iustin Pop | -- entire object, we do take and pass the object to any custom read |
174 | 1c7bda0a | Iustin Pop | -- functions. |
175 | 1c7bda0a | Iustin Pop | loadFn :: Field -- ^ The field definition |
176 | 1c7bda0a | Iustin Pop | -> Q Exp -- ^ The value of the field as existing in the JSON message |
177 | 1c7bda0a | Iustin Pop | -> Q Exp -- ^ The entire object in JSON object format |
178 | 1c7bda0a | Iustin Pop | -> Q Exp -- ^ Resulting expression |
179 | 1c7bda0a | Iustin Pop | loadFn (Field { fieldRead = Just readfn }) expr o = [| $expr >>= $readfn $o |] |
180 | 1c7bda0a | Iustin Pop | loadFn _ expr _ = expr |
181 | 879273e3 | Iustin Pop | |
182 | 879273e3 | Iustin Pop | -- * Common field declarations |
183 | 879273e3 | Iustin Pop | |
184 | 12e8358c | Iustin Pop | -- | Timestamp fields description. |
185 | 879273e3 | Iustin Pop | timeStampFields :: [Field] |
186 | 879273e3 | Iustin Pop | timeStampFields = |
187 | 879273e3 | Iustin Pop | [ defaultField [| 0::Double |] $ simpleField "ctime" [t| Double |] |
188 | 879273e3 | Iustin Pop | , defaultField [| 0::Double |] $ simpleField "mtime" [t| Double |] |
189 | 879273e3 | Iustin Pop | ] |
190 | 879273e3 | Iustin Pop | |
191 | 12e8358c | Iustin Pop | -- | Serial number fields description. |
192 | 879273e3 | Iustin Pop | serialFields :: [Field] |
193 | 879273e3 | Iustin Pop | serialFields = |
194 | 879273e3 | Iustin Pop | [ renameField "Serial" $ simpleField "serial_no" [t| Int |] ] |
195 | 879273e3 | Iustin Pop | |
196 | 12e8358c | Iustin Pop | -- | UUID fields description. |
197 | 879273e3 | Iustin Pop | uuidFields :: [Field] |
198 | 879273e3 | Iustin Pop | uuidFields = [ simpleField "uuid" [t| String |] ] |
199 | 879273e3 | Iustin Pop | |
200 | 9924d61e | Iustin Pop | -- | Tag set type alias. |
201 | 9924d61e | Iustin Pop | type TagSet = Set.Set String |
202 | 9924d61e | Iustin Pop | |
203 | 02cccecd | Iustin Pop | -- | Tag field description. |
204 | 02cccecd | Iustin Pop | tagsFields :: [Field] |
205 | 02cccecd | Iustin Pop | tagsFields = [ defaultField [| Set.empty |] $ |
206 | 9924d61e | Iustin Pop | simpleField "tags" [t| TagSet |] ] |
207 | 02cccecd | Iustin Pop | |
208 | 2e202a9b | Iustin Pop | -- * Internal types |
209 | 2e202a9b | Iustin Pop | |
210 | 2e202a9b | Iustin Pop | -- | A simple field, in constrast to the customisable 'Field' type. |
211 | 2e202a9b | Iustin Pop | type SimpleField = (String, Q Type) |
212 | 2e202a9b | Iustin Pop | |
213 | 2e202a9b | Iustin Pop | -- | A definition for a single constructor for a simple object. |
214 | 2e202a9b | Iustin Pop | type SimpleConstructor = (String, [SimpleField]) |
215 | 2e202a9b | Iustin Pop | |
216 | 2e202a9b | Iustin Pop | -- | A definition for ADTs with simple fields. |
217 | 2e202a9b | Iustin Pop | type SimpleObject = [SimpleConstructor] |
218 | 2e202a9b | Iustin Pop | |
219 | 53664e15 | Iustin Pop | -- * Helper functions |
220 | 53664e15 | Iustin Pop | |
221 | e9aaa3c6 | Iustin Pop | -- | Ensure first letter is lowercase. |
222 | e9aaa3c6 | Iustin Pop | -- |
223 | e9aaa3c6 | Iustin Pop | -- Used to convert type name to function prefix, e.g. in @data Aa -> |
224 | 5f828ce4 | Agata Murawska | -- aaToRaw@. |
225 | e9aaa3c6 | Iustin Pop | ensureLower :: String -> String |
226 | e9aaa3c6 | Iustin Pop | ensureLower [] = [] |
227 | e9aaa3c6 | Iustin Pop | ensureLower (x:xs) = toLower x:xs |
228 | e9aaa3c6 | Iustin Pop | |
229 | 879273e3 | Iustin Pop | -- | Ensure first letter is uppercase. |
230 | 879273e3 | Iustin Pop | -- |
231 | 879273e3 | Iustin Pop | -- Used to convert constructor name to component |
232 | 879273e3 | Iustin Pop | ensureUpper :: String -> String |
233 | 879273e3 | Iustin Pop | ensureUpper [] = [] |
234 | 879273e3 | Iustin Pop | ensureUpper (x:xs) = toUpper x:xs |
235 | 879273e3 | Iustin Pop | |
236 | 53664e15 | Iustin Pop | -- | Helper for quoted expressions. |
237 | 53664e15 | Iustin Pop | varNameE :: String -> Q Exp |
238 | 53664e15 | Iustin Pop | varNameE = varE . mkName |
239 | 53664e15 | Iustin Pop | |
240 | 53664e15 | Iustin Pop | -- | showJSON as an expression, for reuse. |
241 | 53664e15 | Iustin Pop | showJSONE :: Q Exp |
242 | 53664e15 | Iustin Pop | showJSONE = varNameE "showJSON" |
243 | 53664e15 | Iustin Pop | |
244 | 5f828ce4 | Agata Murawska | -- | ToRaw function name. |
245 | 5f828ce4 | Agata Murawska | toRawName :: String -> Name |
246 | 5f828ce4 | Agata Murawska | toRawName = mkName . (++ "ToRaw") . ensureLower |
247 | e9aaa3c6 | Iustin Pop | |
248 | 5f828ce4 | Agata Murawska | -- | FromRaw function name. |
249 | 5f828ce4 | Agata Murawska | fromRawName :: String -> Name |
250 | 5f828ce4 | Agata Murawska | fromRawName = mkName . (++ "FromRaw") . ensureLower |
251 | 260d0bda | Agata Murawska | |
252 | 12e8358c | Iustin Pop | -- | Converts a name to it's varE\/litE representations. |
253 | 6111e296 | Iustin Pop | reprE :: Either String Name -> Q Exp |
254 | 53664e15 | Iustin Pop | reprE = either stringE varE |
255 | 53664e15 | Iustin Pop | |
256 | 60de49c3 | Iustin Pop | -- | Smarter function application. |
257 | 60de49c3 | Iustin Pop | -- |
258 | 60de49c3 | Iustin Pop | -- This does simply f x, except that if is 'id', it will skip it, in |
259 | 60de49c3 | Iustin Pop | -- order to generate more readable code when using -ddump-splices. |
260 | 60de49c3 | Iustin Pop | appFn :: Exp -> Exp -> Exp |
261 | 60de49c3 | Iustin Pop | appFn f x | f == VarE 'id = x |
262 | 60de49c3 | Iustin Pop | | otherwise = AppE f x |
263 | 60de49c3 | Iustin Pop | |
264 | 185b5b0d | Iustin Pop | -- | Builds a field for a normal constructor. |
265 | 185b5b0d | Iustin Pop | buildConsField :: Q Type -> StrictTypeQ |
266 | 185b5b0d | Iustin Pop | buildConsField ftype = do |
267 | 185b5b0d | Iustin Pop | ftype' <- ftype |
268 | 185b5b0d | Iustin Pop | return (NotStrict, ftype') |
269 | 185b5b0d | Iustin Pop | |
270 | 185b5b0d | Iustin Pop | -- | Builds a constructor based on a simple definition (not field-based). |
271 | 185b5b0d | Iustin Pop | buildSimpleCons :: Name -> SimpleObject -> Q Dec |
272 | 185b5b0d | Iustin Pop | buildSimpleCons tname cons = do |
273 | 185b5b0d | Iustin Pop | decl_d <- mapM (\(cname, fields) -> do |
274 | 185b5b0d | Iustin Pop | fields' <- mapM (buildConsField . snd) fields |
275 | 185b5b0d | Iustin Pop | return $ NormalC (mkName cname) fields') cons |
276 | 185b5b0d | Iustin Pop | return $ DataD [] tname [] decl_d [''Show, ''Read, ''Eq] |
277 | 185b5b0d | Iustin Pop | |
278 | 185b5b0d | Iustin Pop | -- | Generate the save function for a given type. |
279 | 185b5b0d | Iustin Pop | genSaveSimpleObj :: Name -- ^ Object type |
280 | 185b5b0d | Iustin Pop | -> String -- ^ Function name |
281 | 185b5b0d | Iustin Pop | -> SimpleObject -- ^ Object definition |
282 | 185b5b0d | Iustin Pop | -> (SimpleConstructor -> Q Clause) -- ^ Constructor save fn |
283 | 185b5b0d | Iustin Pop | -> Q (Dec, Dec) |
284 | 185b5b0d | Iustin Pop | genSaveSimpleObj tname sname opdefs fn = do |
285 | 185b5b0d | Iustin Pop | let sigt = AppT (AppT ArrowT (ConT tname)) (ConT ''JSON.JSValue) |
286 | 185b5b0d | Iustin Pop | fname = mkName sname |
287 | 185b5b0d | Iustin Pop | cclauses <- mapM fn opdefs |
288 | 185b5b0d | Iustin Pop | return $ (SigD fname sigt, FunD fname cclauses) |
289 | 185b5b0d | Iustin Pop | |
290 | 5f828ce4 | Agata Murawska | -- * Template code for simple raw type-equivalent ADTs |
291 | 6111e296 | Iustin Pop | |
292 | e9aaa3c6 | Iustin Pop | -- | Generates a data type declaration. |
293 | e9aaa3c6 | Iustin Pop | -- |
294 | e9aaa3c6 | Iustin Pop | -- The type will have a fixed list of instances. |
295 | e9aaa3c6 | Iustin Pop | strADTDecl :: Name -> [String] -> Dec |
296 | e9aaa3c6 | Iustin Pop | strADTDecl name constructors = |
297 | ebf38064 | Iustin Pop | DataD [] name [] |
298 | ebf38064 | Iustin Pop | (map (flip NormalC [] . mkName) constructors) |
299 | ebf38064 | Iustin Pop | [''Show, ''Read, ''Eq, ''Enum, ''Bounded, ''Ord] |
300 | e9aaa3c6 | Iustin Pop | |
301 | 5f828ce4 | Agata Murawska | -- | Generates a toRaw function. |
302 | e9aaa3c6 | Iustin Pop | -- |
303 | e9aaa3c6 | Iustin Pop | -- This generates a simple function of the form: |
304 | e9aaa3c6 | Iustin Pop | -- |
305 | e9aaa3c6 | Iustin Pop | -- @ |
306 | 5f828ce4 | Agata Murawska | -- nameToRaw :: Name -> /traw/ |
307 | 5f828ce4 | Agata Murawska | -- nameToRaw Cons1 = var1 |
308 | 5f828ce4 | Agata Murawska | -- nameToRaw Cons2 = \"value2\" |
309 | e9aaa3c6 | Iustin Pop | -- @ |
310 | 5f828ce4 | Agata Murawska | genToRaw :: Name -> Name -> Name -> [(String, Either String Name)] -> Q [Dec] |
311 | 5f828ce4 | Agata Murawska | genToRaw traw fname tname constructors = do |
312 | d80e3485 | Iustin Pop | let sigt = AppT (AppT ArrowT (ConT tname)) (ConT traw) |
313 | e9aaa3c6 | Iustin Pop | -- the body clauses, matching on the constructor and returning the |
314 | 5f828ce4 | Agata Murawska | -- raw value |
315 | e9aaa3c6 | Iustin Pop | clauses <- mapM (\(c, v) -> clause [recP (mkName c) []] |
316 | 6111e296 | Iustin Pop | (normalB (reprE v)) []) constructors |
317 | e9aaa3c6 | Iustin Pop | return [SigD fname sigt, FunD fname clauses] |
318 | e9aaa3c6 | Iustin Pop | |
319 | 5f828ce4 | Agata Murawska | -- | Generates a fromRaw function. |
320 | e9aaa3c6 | Iustin Pop | -- |
321 | e9aaa3c6 | Iustin Pop | -- The function generated is monadic and can fail parsing the |
322 | 5f828ce4 | Agata Murawska | -- raw value. It is of the form: |
323 | e9aaa3c6 | Iustin Pop | -- |
324 | e9aaa3c6 | Iustin Pop | -- @ |
325 | 5f828ce4 | Agata Murawska | -- nameFromRaw :: (Monad m) => /traw/ -> m Name |
326 | 5f828ce4 | Agata Murawska | -- nameFromRaw s | s == var1 = Cons1 |
327 | 5f828ce4 | Agata Murawska | -- | s == \"value2\" = Cons2 |
328 | 5f828ce4 | Agata Murawska | -- | otherwise = fail /.../ |
329 | e9aaa3c6 | Iustin Pop | -- @ |
330 | 5f828ce4 | Agata Murawska | genFromRaw :: Name -> Name -> Name -> [(String, Name)] -> Q [Dec] |
331 | 5f828ce4 | Agata Murawska | genFromRaw traw fname tname constructors = do |
332 | e9aaa3c6 | Iustin Pop | -- signature of form (Monad m) => String -> m $name |
333 | 5f828ce4 | Agata Murawska | sigt <- [t| (Monad m) => $(conT traw) -> m $(conT tname) |] |
334 | e9aaa3c6 | Iustin Pop | -- clauses for a guarded pattern |
335 | e9aaa3c6 | Iustin Pop | let varp = mkName "s" |
336 | e9aaa3c6 | Iustin Pop | varpe = varE varp |
337 | e9aaa3c6 | Iustin Pop | clauses <- mapM (\(c, v) -> do |
338 | e9aaa3c6 | Iustin Pop | -- the clause match condition |
339 | e9aaa3c6 | Iustin Pop | g <- normalG [| $varpe == $(varE v) |] |
340 | e9aaa3c6 | Iustin Pop | -- the clause result |
341 | e9aaa3c6 | Iustin Pop | r <- [| return $(conE (mkName c)) |] |
342 | e9aaa3c6 | Iustin Pop | return (g, r)) constructors |
343 | e9aaa3c6 | Iustin Pop | -- the otherwise clause (fallback) |
344 | e9aaa3c6 | Iustin Pop | oth_clause <- do |
345 | e9aaa3c6 | Iustin Pop | g <- normalG [| otherwise |] |
346 | e9aaa3c6 | Iustin Pop | r <- [|fail ("Invalid string value for type " ++ |
347 | 5f828ce4 | Agata Murawska | $(litE (stringL (nameBase tname))) ++ ": " ++ show $varpe) |] |
348 | e9aaa3c6 | Iustin Pop | return (g, r) |
349 | e9aaa3c6 | Iustin Pop | let fun = FunD fname [Clause [VarP varp] |
350 | e9aaa3c6 | Iustin Pop | (GuardedB (clauses++[oth_clause])) []] |
351 | e9aaa3c6 | Iustin Pop | return [SigD fname sigt, fun] |
352 | e9aaa3c6 | Iustin Pop | |
353 | 5f828ce4 | Agata Murawska | -- | Generates a data type from a given raw format. |
354 | e9aaa3c6 | Iustin Pop | -- |
355 | e9aaa3c6 | Iustin Pop | -- The format is expected to multiline. The first line contains the |
356 | e9aaa3c6 | Iustin Pop | -- type name, and the rest of the lines must contain two words: the |
357 | e9aaa3c6 | Iustin Pop | -- constructor name and then the string representation of the |
358 | e9aaa3c6 | Iustin Pop | -- respective constructor. |
359 | e9aaa3c6 | Iustin Pop | -- |
360 | e9aaa3c6 | Iustin Pop | -- The function will generate the data type declaration, and then two |
361 | e9aaa3c6 | Iustin Pop | -- functions: |
362 | e9aaa3c6 | Iustin Pop | -- |
363 | 5f828ce4 | Agata Murawska | -- * /name/ToRaw, which converts the type to a raw type |
364 | e9aaa3c6 | Iustin Pop | -- |
365 | 5f828ce4 | Agata Murawska | -- * /name/FromRaw, which (monadically) converts from a raw type to the type |
366 | e9aaa3c6 | Iustin Pop | -- |
367 | 12e8358c | Iustin Pop | -- Note that this is basically just a custom show\/read instance, |
368 | e9aaa3c6 | Iustin Pop | -- nothing else. |
369 | 5f828ce4 | Agata Murawska | declareADT :: Name -> String -> [(String, Name)] -> Q [Dec] |
370 | 5f828ce4 | Agata Murawska | declareADT traw sname cons = do |
371 | e9aaa3c6 | Iustin Pop | let name = mkName sname |
372 | e9aaa3c6 | Iustin Pop | ddecl = strADTDecl name (map fst cons) |
373 | 5f828ce4 | Agata Murawska | -- process cons in the format expected by genToRaw |
374 | 6111e296 | Iustin Pop | cons' = map (\(a, b) -> (a, Right b)) cons |
375 | 5f828ce4 | Agata Murawska | toraw <- genToRaw traw (toRawName sname) name cons' |
376 | 5f828ce4 | Agata Murawska | fromraw <- genFromRaw traw (fromRawName sname) name cons |
377 | 5f828ce4 | Agata Murawska | return $ ddecl:toraw ++ fromraw |
378 | e9aaa3c6 | Iustin Pop | |
379 | 5f828ce4 | Agata Murawska | declareIADT :: String -> [(String, Name)] -> Q [Dec] |
380 | 5f828ce4 | Agata Murawska | declareIADT = declareADT ''Int |
381 | 5f828ce4 | Agata Murawska | |
382 | 5f828ce4 | Agata Murawska | declareSADT :: String -> [(String, Name)] -> Q [Dec] |
383 | 5f828ce4 | Agata Murawska | declareSADT = declareADT ''String |
384 | e9aaa3c6 | Iustin Pop | |
385 | e9aaa3c6 | Iustin Pop | -- | Creates the showJSON member of a JSON instance declaration. |
386 | e9aaa3c6 | Iustin Pop | -- |
387 | e9aaa3c6 | Iustin Pop | -- This will create what is the equivalent of: |
388 | e9aaa3c6 | Iustin Pop | -- |
389 | e9aaa3c6 | Iustin Pop | -- @ |
390 | 5f828ce4 | Agata Murawska | -- showJSON = showJSON . /name/ToRaw |
391 | e9aaa3c6 | Iustin Pop | -- @ |
392 | e9aaa3c6 | Iustin Pop | -- |
393 | e9aaa3c6 | Iustin Pop | -- in an instance JSON /name/ declaration |
394 | ffbd9592 | Iustin Pop | genShowJSON :: String -> Q Dec |
395 | ffbd9592 | Iustin Pop | genShowJSON name = do |
396 | ffbd9592 | Iustin Pop | body <- [| JSON.showJSON . $(varE (toRawName name)) |] |
397 | ffbd9592 | Iustin Pop | return $ FunD (mkName "showJSON") [Clause [] (NormalB body) []] |
398 | e9aaa3c6 | Iustin Pop | |
399 | e9aaa3c6 | Iustin Pop | -- | Creates the readJSON member of a JSON instance declaration. |
400 | e9aaa3c6 | Iustin Pop | -- |
401 | e9aaa3c6 | Iustin Pop | -- This will create what is the equivalent of: |
402 | e9aaa3c6 | Iustin Pop | -- |
403 | e9aaa3c6 | Iustin Pop | -- @ |
404 | e9aaa3c6 | Iustin Pop | -- readJSON s = case readJSON s of |
405 | 5f828ce4 | Agata Murawska | -- Ok s' -> /name/FromRaw s' |
406 | e9aaa3c6 | Iustin Pop | -- Error e -> Error /description/ |
407 | e9aaa3c6 | Iustin Pop | -- @ |
408 | e9aaa3c6 | Iustin Pop | -- |
409 | e9aaa3c6 | Iustin Pop | -- in an instance JSON /name/ declaration |
410 | e9aaa3c6 | Iustin Pop | genReadJSON :: String -> Q Dec |
411 | e9aaa3c6 | Iustin Pop | genReadJSON name = do |
412 | e9aaa3c6 | Iustin Pop | let s = mkName "s" |
413 | e9aaa3c6 | Iustin Pop | body <- [| case JSON.readJSON $(varE s) of |
414 | 5f828ce4 | Agata Murawska | JSON.Ok s' -> $(varE (fromRawName name)) s' |
415 | e9aaa3c6 | Iustin Pop | JSON.Error e -> |
416 | 5f828ce4 | Agata Murawska | JSON.Error $ "Can't parse raw value for type " ++ |
417 | 6bd26f00 | Iustin Pop | $(stringE name) ++ ": " ++ e ++ " from " ++ |
418 | 6bd26f00 | Iustin Pop | show $(varE s) |
419 | e9aaa3c6 | Iustin Pop | |] |
420 | e9aaa3c6 | Iustin Pop | return $ FunD (mkName "readJSON") [Clause [VarP s] (NormalB body) []] |
421 | e9aaa3c6 | Iustin Pop | |
422 | e9aaa3c6 | Iustin Pop | -- | Generates a JSON instance for a given type. |
423 | e9aaa3c6 | Iustin Pop | -- |
424 | 5f828ce4 | Agata Murawska | -- This assumes that the /name/ToRaw and /name/FromRaw functions |
425 | e9aaa3c6 | Iustin Pop | -- have been defined as by the 'declareSADT' function. |
426 | e9aaa3c6 | Iustin Pop | makeJSONInstance :: Name -> Q [Dec] |
427 | e9aaa3c6 | Iustin Pop | makeJSONInstance name = do |
428 | e9aaa3c6 | Iustin Pop | let base = nameBase name |
429 | e9aaa3c6 | Iustin Pop | showJ <- genShowJSON base |
430 | e9aaa3c6 | Iustin Pop | readJ <- genReadJSON base |
431 | ffbd9592 | Iustin Pop | return [InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) [readJ,showJ]] |
432 | 6111e296 | Iustin Pop | |
433 | 53664e15 | Iustin Pop | -- * Template code for opcodes |
434 | 53664e15 | Iustin Pop | |
435 | 6111e296 | Iustin Pop | -- | Transforms a CamelCase string into an_underscore_based_one. |
436 | 6111e296 | Iustin Pop | deCamelCase :: String -> String |
437 | 6111e296 | Iustin Pop | deCamelCase = |
438 | 6111e296 | Iustin Pop | intercalate "_" . map (map toUpper) . groupBy (\_ b -> not $ isUpper b) |
439 | 6111e296 | Iustin Pop | |
440 | 879273e3 | Iustin Pop | -- | Transform an underscore_name into a CamelCase one. |
441 | 879273e3 | Iustin Pop | camelCase :: String -> String |
442 | 879273e3 | Iustin Pop | camelCase = concatMap (ensureUpper . drop 1) . |
443 | d8cb8e13 | Iustin Pop | groupBy (\_ b -> b /= '_' && b /= '-') . ('_':) |
444 | 879273e3 | Iustin Pop | |
445 | 05ff7a00 | Agata Murawska | -- | Computes the name of a given constructor. |
446 | 6111e296 | Iustin Pop | constructorName :: Con -> Q Name |
447 | 6111e296 | Iustin Pop | constructorName (NormalC name _) = return name |
448 | 6111e296 | Iustin Pop | constructorName (RecC name _) = return name |
449 | 6111e296 | Iustin Pop | constructorName x = fail $ "Unhandled constructor " ++ show x |
450 | 6111e296 | Iustin Pop | |
451 | 94518cdb | Iustin Pop | -- | Extract all constructor names from a given type. |
452 | 94518cdb | Iustin Pop | reifyConsNames :: Name -> Q [String] |
453 | 94518cdb | Iustin Pop | reifyConsNames name = do |
454 | 94518cdb | Iustin Pop | reify_result <- reify name |
455 | 94518cdb | Iustin Pop | case reify_result of |
456 | 94518cdb | Iustin Pop | TyConI (DataD _ _ _ cons _) -> mapM (liftM nameBase . constructorName) cons |
457 | 94518cdb | Iustin Pop | o -> fail $ "Unhandled name passed to reifyConsNames, expected\ |
458 | 94518cdb | Iustin Pop | \ type constructor but got '" ++ show o ++ "'" |
459 | 94518cdb | Iustin Pop | |
460 | a0090487 | Agata Murawska | -- | Builds the generic constructor-to-string function. |
461 | 6111e296 | Iustin Pop | -- |
462 | 6111e296 | Iustin Pop | -- This generates a simple function of the following form: |
463 | 6111e296 | Iustin Pop | -- |
464 | 6111e296 | Iustin Pop | -- @ |
465 | a0090487 | Agata Murawska | -- fname (ConStructorOne {}) = trans_fun("ConStructorOne") |
466 | a0090487 | Agata Murawska | -- fname (ConStructorTwo {}) = trans_fun("ConStructorTwo") |
467 | 6111e296 | Iustin Pop | -- @ |
468 | 6111e296 | Iustin Pop | -- |
469 | 12e8358c | Iustin Pop | -- This builds a custom list of name\/string pairs and then uses |
470 | 12e8358c | Iustin Pop | -- 'genToRaw' to actually generate the function. |
471 | a0090487 | Agata Murawska | genConstrToStr :: (String -> String) -> Name -> String -> Q [Dec] |
472 | a0090487 | Agata Murawska | genConstrToStr trans_fun name fname = do |
473 | 94518cdb | Iustin Pop | cnames <- reifyConsNames name |
474 | a0090487 | Agata Murawska | let svalues = map (Left . trans_fun) cnames |
475 | 5f828ce4 | Agata Murawska | genToRaw ''String (mkName fname) name $ zip cnames svalues |
476 | 12c19659 | Iustin Pop | |
477 | a0090487 | Agata Murawska | -- | Constructor-to-string for OpCode. |
478 | a0090487 | Agata Murawska | genOpID :: Name -> String -> Q [Dec] |
479 | a0090487 | Agata Murawska | genOpID = genConstrToStr deCamelCase |
480 | 12c19659 | Iustin Pop | |
481 | a583ec5d | Iustin Pop | -- | Builds a list with all defined constructor names for a type. |
482 | a583ec5d | Iustin Pop | -- |
483 | a583ec5d | Iustin Pop | -- @ |
484 | a583ec5d | Iustin Pop | -- vstr :: String |
485 | a583ec5d | Iustin Pop | -- vstr = [...] |
486 | a583ec5d | Iustin Pop | -- @ |
487 | a583ec5d | Iustin Pop | -- |
488 | a583ec5d | Iustin Pop | -- Where the actual values of the string are the constructor names |
489 | a583ec5d | Iustin Pop | -- mapped via @trans_fun@. |
490 | a583ec5d | Iustin Pop | genAllConstr :: (String -> String) -> Name -> String -> Q [Dec] |
491 | a583ec5d | Iustin Pop | genAllConstr trans_fun name vstr = do |
492 | a583ec5d | Iustin Pop | cnames <- reifyConsNames name |
493 | a583ec5d | Iustin Pop | let svalues = sort $ map trans_fun cnames |
494 | a583ec5d | Iustin Pop | vname = mkName vstr |
495 | a583ec5d | Iustin Pop | sig = SigD vname (AppT ListT (ConT ''String)) |
496 | a583ec5d | Iustin Pop | body = NormalB (ListE (map (LitE . StringL) svalues)) |
497 | a583ec5d | Iustin Pop | return $ [sig, ValD (VarP vname) body []] |
498 | a583ec5d | Iustin Pop | |
499 | a583ec5d | Iustin Pop | -- | Generates a list of all defined opcode IDs. |
500 | a583ec5d | Iustin Pop | genAllOpIDs :: Name -> String -> Q [Dec] |
501 | a583ec5d | Iustin Pop | genAllOpIDs = genAllConstr deCamelCase |
502 | a583ec5d | Iustin Pop | |
503 | 05ff7a00 | Agata Murawska | -- | OpCode parameter (field) type. |
504 | 12c19659 | Iustin Pop | type OpParam = (String, Q Type, Q Exp) |
505 | 12c19659 | Iustin Pop | |
506 | 12c19659 | Iustin Pop | -- | Generates the OpCode data type. |
507 | 12c19659 | Iustin Pop | -- |
508 | 12c19659 | Iustin Pop | -- This takes an opcode logical definition, and builds both the |
509 | 12c19659 | Iustin Pop | -- datatype and the JSON serialisation out of it. We can't use a |
510 | 12c19659 | Iustin Pop | -- generic serialisation since we need to be compatible with Ganeti's |
511 | 12c19659 | Iustin Pop | -- own, so we have a few quirks to work around. |
512 | 12c19659 | Iustin Pop | genOpCode :: String -- ^ Type name to use |
513 | a1505857 | Iustin Pop | -> [(String, [Field])] -- ^ Constructor name and parameters |
514 | 12c19659 | Iustin Pop | -> Q [Dec] |
515 | 12c19659 | Iustin Pop | genOpCode name cons = do |
516 | 92ad1f44 | Iustin Pop | let tname = mkName name |
517 | 12c19659 | Iustin Pop | decl_d <- mapM (\(cname, fields) -> do |
518 | 12c19659 | Iustin Pop | -- we only need the type of the field, without Q |
519 | a1505857 | Iustin Pop | fields' <- mapM actualFieldType fields |
520 | a1505857 | Iustin Pop | let fields'' = zip (repeat NotStrict) fields' |
521 | a1505857 | Iustin Pop | return $ NormalC (mkName cname) fields'') |
522 | 12c19659 | Iustin Pop | cons |
523 | 92ad1f44 | Iustin Pop | let declD = DataD [] tname [] decl_d [''Show, ''Read, ''Eq] |
524 | 12c19659 | Iustin Pop | |
525 | 92ad1f44 | Iustin Pop | (savesig, savefn) <- genSaveOpCode tname "saveOpCode" cons |
526 | 92ad1f44 | Iustin Pop | (uncurry saveConstructor) |
527 | 12c19659 | Iustin Pop | (loadsig, loadfn) <- genLoadOpCode cons |
528 | 12c19659 | Iustin Pop | return [declD, loadsig, loadfn, savesig, savefn] |
529 | 12c19659 | Iustin Pop | |
530 | 12c19659 | Iustin Pop | -- | Generates the \"save\" clause for an entire opcode constructor. |
531 | 12c19659 | Iustin Pop | -- |
532 | 12c19659 | Iustin Pop | -- This matches the opcode with variables named the same as the |
533 | 12c19659 | Iustin Pop | -- constructor fields (just so that the spliced in code looks nicer), |
534 | a1505857 | Iustin Pop | -- and passes those name plus the parameter definition to 'saveObjectField'. |
535 | 12c19659 | Iustin Pop | saveConstructor :: String -- ^ The constructor name |
536 | a1505857 | Iustin Pop | -> [Field] -- ^ The parameter definitions for this |
537 | 12c19659 | Iustin Pop | -- constructor |
538 | 12c19659 | Iustin Pop | -> Q Clause -- ^ Resulting clause |
539 | 12c19659 | Iustin Pop | saveConstructor sname fields = do |
540 | 12c19659 | Iustin Pop | let cname = mkName sname |
541 | d8cb8e13 | Iustin Pop | fnames <- mapM (newName . fieldVariable) fields |
542 | 12c19659 | Iustin Pop | let pat = conP cname (map varP fnames) |
543 | a1505857 | Iustin Pop | let felems = map (uncurry saveObjectField) (zip fnames fields) |
544 | 12c19659 | Iustin Pop | -- now build the OP_ID serialisation |
545 | 53664e15 | Iustin Pop | opid = [| [( $(stringE "OP_ID"), |
546 | a07343b2 | Iustin Pop | JSON.showJSON $(stringE . deCamelCase $ sname) )] |] |
547 | 12c19659 | Iustin Pop | flist = listE (opid:felems) |
548 | 12c19659 | Iustin Pop | -- and finally convert all this to a json object |
549 | 53664e15 | Iustin Pop | flist' = [| $(varNameE "makeObj") (concat $flist) |] |
550 | 12c19659 | Iustin Pop | clause [pat] (normalB flist') [] |
551 | 12c19659 | Iustin Pop | |
552 | 12c19659 | Iustin Pop | -- | Generates the main save opcode function. |
553 | 12c19659 | Iustin Pop | -- |
554 | 12c19659 | Iustin Pop | -- This builds a per-constructor match clause that contains the |
555 | 12c19659 | Iustin Pop | -- respective constructor-serialisation code. |
556 | 92ad1f44 | Iustin Pop | genSaveOpCode :: Name -- ^ Object ype |
557 | 92ad1f44 | Iustin Pop | -> String -- ^ Function name |
558 | 92ad1f44 | Iustin Pop | -> [(String, [Field])] -- ^ Object definition |
559 | 92ad1f44 | Iustin Pop | -> ((String, [Field]) -> Q Clause) -- ^ Constructor save fn |
560 | 92ad1f44 | Iustin Pop | -> Q (Dec, Dec) |
561 | 92ad1f44 | Iustin Pop | genSaveOpCode tname sname opdefs fn = do |
562 | 92ad1f44 | Iustin Pop | cclauses <- mapM fn opdefs |
563 | 92ad1f44 | Iustin Pop | let fname = mkName sname |
564 | 92ad1f44 | Iustin Pop | sigt = AppT (AppT ArrowT (ConT tname)) (ConT ''JSON.JSValue) |
565 | 12c19659 | Iustin Pop | return $ (SigD fname sigt, FunD fname cclauses) |
566 | 12c19659 | Iustin Pop | |
567 | 12e8358c | Iustin Pop | -- | Generates load code for a single constructor of the opcode data type. |
568 | a1505857 | Iustin Pop | loadConstructor :: String -> [Field] -> Q Exp |
569 | 12c19659 | Iustin Pop | loadConstructor sname fields = do |
570 | 12c19659 | Iustin Pop | let name = mkName sname |
571 | a1505857 | Iustin Pop | fbinds <- mapM loadObjectField fields |
572 | 12c19659 | Iustin Pop | let (fnames, fstmts) = unzip fbinds |
573 | 12c19659 | Iustin Pop | let cval = foldl (\accu fn -> AppE accu (VarE fn)) (ConE name) fnames |
574 | 12c19659 | Iustin Pop | fstmts' = fstmts ++ [NoBindS (AppE (VarE 'return) cval)] |
575 | 12c19659 | Iustin Pop | return $ DoE fstmts' |
576 | 12c19659 | Iustin Pop | |
577 | 12e8358c | Iustin Pop | -- | Generates the loadOpCode function. |
578 | a1505857 | Iustin Pop | genLoadOpCode :: [(String, [Field])] -> Q (Dec, Dec) |
579 | 12c19659 | Iustin Pop | genLoadOpCode opdefs = do |
580 | 12c19659 | Iustin Pop | let fname = mkName "loadOpCode" |
581 | 12c19659 | Iustin Pop | arg1 = mkName "v" |
582 | 12c19659 | Iustin Pop | objname = mkName "o" |
583 | 12c19659 | Iustin Pop | opid = mkName "op_id" |
584 | 12c19659 | Iustin Pop | st1 <- bindS (varP objname) [| liftM JSON.fromJSObject |
585 | 12c19659 | Iustin Pop | (JSON.readJSON $(varE arg1)) |] |
586 | 53664e15 | Iustin Pop | st2 <- bindS (varP opid) [| $(varNameE "fromObj") |
587 | 53664e15 | Iustin Pop | $(varE objname) $(stringE "OP_ID") |] |
588 | 12c19659 | Iustin Pop | -- the match results (per-constructor blocks) |
589 | 12c19659 | Iustin Pop | mexps <- mapM (uncurry loadConstructor) opdefs |
590 | 12c19659 | Iustin Pop | fails <- [| fail $ "Unknown opcode " ++ $(varE opid) |] |
591 | 12c19659 | Iustin Pop | let mpats = map (\(me, c) -> |
592 | 12c19659 | Iustin Pop | let mp = LitP . StringL . deCamelCase . fst $ c |
593 | 12c19659 | Iustin Pop | in Match mp (NormalB me) [] |
594 | 12c19659 | Iustin Pop | ) $ zip mexps opdefs |
595 | 12c19659 | Iustin Pop | defmatch = Match WildP (NormalB fails) [] |
596 | 12c19659 | Iustin Pop | cst = NoBindS $ CaseE (VarE opid) $ mpats++[defmatch] |
597 | 12c19659 | Iustin Pop | body = DoE [st1, st2, cst] |
598 | 12c19659 | Iustin Pop | sigt <- [t| JSON.JSValue -> JSON.Result $(conT (mkName "OpCode")) |] |
599 | 12c19659 | Iustin Pop | return $ (SigD fname sigt, FunD fname [Clause [VarP arg1] (NormalB body) []]) |
600 | 12c19659 | Iustin Pop | |
601 | a0090487 | Agata Murawska | -- * Template code for luxi |
602 | a0090487 | Agata Murawska | |
603 | a0090487 | Agata Murawska | -- | Constructor-to-string for LuxiOp. |
604 | a0090487 | Agata Murawska | genStrOfOp :: Name -> String -> Q [Dec] |
605 | a0090487 | Agata Murawska | genStrOfOp = genConstrToStr id |
606 | a0090487 | Agata Murawska | |
607 | a0090487 | Agata Murawska | -- | Constructor-to-string for MsgKeys. |
608 | a0090487 | Agata Murawska | genStrOfKey :: Name -> String -> Q [Dec] |
609 | a0090487 | Agata Murawska | genStrOfKey = genConstrToStr ensureLower |
610 | a0090487 | Agata Murawska | |
611 | a0090487 | Agata Murawska | -- | Generates the LuxiOp data type. |
612 | a0090487 | Agata Murawska | -- |
613 | a0090487 | Agata Murawska | -- This takes a Luxi operation definition and builds both the |
614 | a0090487 | Agata Murawska | -- datatype and the function trnasforming the arguments to JSON. |
615 | a0090487 | Agata Murawska | -- We can't use anything less generic, because the way different |
616 | a0090487 | Agata Murawska | -- operations are serialized differs on both parameter- and top-level. |
617 | a0090487 | Agata Murawska | -- |
618 | 4b71f30c | Iustin Pop | -- There are two things to be defined for each parameter: |
619 | a0090487 | Agata Murawska | -- |
620 | a0090487 | Agata Murawska | -- * name |
621 | a0090487 | Agata Murawska | -- |
622 | a0090487 | Agata Murawska | -- * type |
623 | a0090487 | Agata Murawska | -- |
624 | 88609f00 | Iustin Pop | genLuxiOp :: String -> [(String, [Field])] -> Q [Dec] |
625 | a0090487 | Agata Murawska | genLuxiOp name cons = do |
626 | 185b5b0d | Iustin Pop | let tname = mkName name |
627 | 88609f00 | Iustin Pop | decl_d <- mapM (\(cname, fields) -> do |
628 | 88609f00 | Iustin Pop | -- we only need the type of the field, without Q |
629 | 88609f00 | Iustin Pop | fields' <- mapM actualFieldType fields |
630 | 88609f00 | Iustin Pop | let fields'' = zip (repeat NotStrict) fields' |
631 | 88609f00 | Iustin Pop | return $ NormalC (mkName cname) fields'') |
632 | 88609f00 | Iustin Pop | cons |
633 | 88609f00 | Iustin Pop | let declD = DataD [] (mkName name) [] decl_d [''Show, ''Read, ''Eq] |
634 | 88609f00 | Iustin Pop | (savesig, savefn) <- genSaveOpCode tname "opToArgs" |
635 | 185b5b0d | Iustin Pop | cons saveLuxiConstructor |
636 | 95d0d502 | Iustin Pop | req_defs <- declareSADT "LuxiReq" . |
637 | 95d0d502 | Iustin Pop | map (\(str, _) -> ("Req" ++ str, mkName ("luxiReq" ++ str))) $ |
638 | 95d0d502 | Iustin Pop | cons |
639 | 95d0d502 | Iustin Pop | return $ [declD, savesig, savefn] ++ req_defs |
640 | a0090487 | Agata Murawska | |
641 | 92678b3c | Iustin Pop | -- | Generates the \"save\" expression for a single luxi parameter. |
642 | 2e202a9b | Iustin Pop | saveLuxiField :: Name -> SimpleField -> Q Exp |
643 | 4b71f30c | Iustin Pop | saveLuxiField fvar (_, qt) = |
644 | 4b71f30c | Iustin Pop | [| JSON.showJSON $(varE fvar) |] |
645 | 92678b3c | Iustin Pop | |
646 | a0090487 | Agata Murawska | -- | Generates the \"save\" clause for entire LuxiOp constructor. |
647 | 88609f00 | Iustin Pop | saveLuxiConstructor :: (String, [Field]) -> Q Clause |
648 | b20cbf06 | Iustin Pop | saveLuxiConstructor (sname, fields) = do |
649 | a0090487 | Agata Murawska | let cname = mkName sname |
650 | 88609f00 | Iustin Pop | fnames <- mapM (newName . fieldVariable) fields |
651 | 88609f00 | Iustin Pop | let pat = conP cname (map varP fnames) |
652 | 88609f00 | Iustin Pop | let felems = map (uncurry saveObjectField) (zip fnames fields) |
653 | 88609f00 | Iustin Pop | flist = if null felems |
654 | 88609f00 | Iustin Pop | then [| JSON.showJSON () |] |
655 | 88609f00 | Iustin Pop | else [| JSON.showJSON (map snd $ concat $(listE felems)) |] |
656 | 88609f00 | Iustin Pop | clause [pat] (normalB flist) [] |
657 | a0090487 | Agata Murawska | |
658 | 879273e3 | Iustin Pop | -- * "Objects" functionality |
659 | 879273e3 | Iustin Pop | |
660 | 879273e3 | Iustin Pop | -- | Extract the field's declaration from a Field structure. |
661 | 879273e3 | Iustin Pop | fieldTypeInfo :: String -> Field -> Q (Name, Strict, Type) |
662 | 879273e3 | Iustin Pop | fieldTypeInfo field_pfx fd = do |
663 | 879273e3 | Iustin Pop | t <- actualFieldType fd |
664 | 879273e3 | Iustin Pop | let n = mkName . (field_pfx ++) . fieldRecordName $ fd |
665 | 879273e3 | Iustin Pop | return (n, NotStrict, t) |
666 | 879273e3 | Iustin Pop | |
667 | 879273e3 | Iustin Pop | -- | Build an object declaration. |
668 | 879273e3 | Iustin Pop | buildObject :: String -> String -> [Field] -> Q [Dec] |
669 | 879273e3 | Iustin Pop | buildObject sname field_pfx fields = do |
670 | 879273e3 | Iustin Pop | let name = mkName sname |
671 | 879273e3 | Iustin Pop | fields_d <- mapM (fieldTypeInfo field_pfx) fields |
672 | 879273e3 | Iustin Pop | let decl_d = RecC name fields_d |
673 | 3c3c796e | Iustin Pop | let declD = DataD [] name [] [decl_d] [''Show, ''Read, ''Eq] |
674 | 879273e3 | Iustin Pop | ser_decls <- buildObjectSerialisation sname fields |
675 | 879273e3 | Iustin Pop | return $ declD:ser_decls |
676 | 879273e3 | Iustin Pop | |
677 | 12e8358c | Iustin Pop | -- | Generates an object definition: data type and its JSON instance. |
678 | 879273e3 | Iustin Pop | buildObjectSerialisation :: String -> [Field] -> Q [Dec] |
679 | 879273e3 | Iustin Pop | buildObjectSerialisation sname fields = do |
680 | 879273e3 | Iustin Pop | let name = mkName sname |
681 | 879273e3 | Iustin Pop | savedecls <- genSaveObject saveObjectField sname fields |
682 | 879273e3 | Iustin Pop | (loadsig, loadfn) <- genLoadObject loadObjectField sname fields |
683 | 879273e3 | Iustin Pop | shjson <- objectShowJSON sname |
684 | 879273e3 | Iustin Pop | rdjson <- objectReadJSON sname |
685 | 879273e3 | Iustin Pop | let instdecl = InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) |
686 | ffbd9592 | Iustin Pop | [rdjson, shjson] |
687 | 879273e3 | Iustin Pop | return $ savedecls ++ [loadsig, loadfn, instdecl] |
688 | 879273e3 | Iustin Pop | |
689 | 2af78b97 | Iustin Pop | -- | The toDict function name for a given type. |
690 | 2af78b97 | Iustin Pop | toDictName :: String -> Name |
691 | 2af78b97 | Iustin Pop | toDictName sname = mkName ("toDict" ++ sname) |
692 | 2af78b97 | Iustin Pop | |
693 | 12e8358c | Iustin Pop | -- | Generates the save object functionality. |
694 | 879273e3 | Iustin Pop | genSaveObject :: (Name -> Field -> Q Exp) |
695 | 879273e3 | Iustin Pop | -> String -> [Field] -> Q [Dec] |
696 | 879273e3 | Iustin Pop | genSaveObject save_fn sname fields = do |
697 | 879273e3 | Iustin Pop | let name = mkName sname |
698 | d8cb8e13 | Iustin Pop | fnames <- mapM (newName . fieldVariable) fields |
699 | 879273e3 | Iustin Pop | let pat = conP name (map varP fnames) |
700 | 2af78b97 | Iustin Pop | let tdname = toDictName sname |
701 | 879273e3 | Iustin Pop | tdsigt <- [t| $(conT name) -> [(String, JSON.JSValue)] |] |
702 | 879273e3 | Iustin Pop | |
703 | 879273e3 | Iustin Pop | let felems = map (uncurry save_fn) (zip fnames fields) |
704 | 879273e3 | Iustin Pop | flist = listE felems |
705 | 879273e3 | Iustin Pop | -- and finally convert all this to a json object |
706 | 879273e3 | Iustin Pop | tdlist = [| concat $flist |] |
707 | 879273e3 | Iustin Pop | iname = mkName "i" |
708 | 879273e3 | Iustin Pop | tclause <- clause [pat] (normalB tdlist) [] |
709 | 879273e3 | Iustin Pop | cclause <- [| $(varNameE "makeObj") . $(varE tdname) |] |
710 | 879273e3 | Iustin Pop | let fname = mkName ("save" ++ sname) |
711 | 879273e3 | Iustin Pop | sigt <- [t| $(conT name) -> JSON.JSValue |] |
712 | 879273e3 | Iustin Pop | return [SigD tdname tdsigt, FunD tdname [tclause], |
713 | 879273e3 | Iustin Pop | SigD fname sigt, ValD (VarP fname) (NormalB cclause) []] |
714 | 879273e3 | Iustin Pop | |
715 | 12e8358c | Iustin Pop | -- | Generates the code for saving an object's field, handling the |
716 | 12e8358c | Iustin Pop | -- various types of fields that we have. |
717 | 879273e3 | Iustin Pop | saveObjectField :: Name -> Field -> Q Exp |
718 | 9b156883 | Iustin Pop | saveObjectField fvar field = |
719 | 9b156883 | Iustin Pop | case fieldIsOptional field of |
720 | 9b156883 | Iustin Pop | OptionalOmitNull -> [| case $(varE fvar) of |
721 | 9b156883 | Iustin Pop | Nothing -> [] |
722 | 9b156883 | Iustin Pop | Just v -> [( $nameE, JSON.showJSON v )] |
723 | 9b156883 | Iustin Pop | |] |
724 | 9b156883 | Iustin Pop | OptionalSerializeNull -> [| case $(varE fvar) of |
725 | 9b156883 | Iustin Pop | Nothing -> [( $nameE, JSON.JSNull )] |
726 | 9b156883 | Iustin Pop | Just v -> [( $nameE, JSON.showJSON v )] |
727 | 9b156883 | Iustin Pop | |] |
728 | 9b156883 | Iustin Pop | NotOptional -> |
729 | 9b156883 | Iustin Pop | case fieldShow field of |
730 | 88609f00 | Iustin Pop | -- Note: the order of actual:extra is important, since for |
731 | 88609f00 | Iustin Pop | -- some serialisation types (e.g. Luxi), we use tuples |
732 | 88609f00 | Iustin Pop | -- (positional info) rather than object (name info) |
733 | 9b156883 | Iustin Pop | Nothing -> [| [( $nameE, JSON.showJSON $fvarE)] |] |
734 | 9b156883 | Iustin Pop | Just fn -> [| let (actual, extra) = $fn $fvarE |
735 | 88609f00 | Iustin Pop | in ($nameE, JSON.showJSON actual):extra |
736 | 9b156883 | Iustin Pop | |] |
737 | 9b156883 | Iustin Pop | where nameE = stringE (fieldName field) |
738 | 879273e3 | Iustin Pop | fvarE = varE fvar |
739 | 879273e3 | Iustin Pop | |
740 | 12e8358c | Iustin Pop | -- | Generates the showJSON clause for a given object name. |
741 | ffbd9592 | Iustin Pop | objectShowJSON :: String -> Q Dec |
742 | ffbd9592 | Iustin Pop | objectShowJSON name = do |
743 | ffbd9592 | Iustin Pop | body <- [| JSON.showJSON . $(varE . mkName $ "save" ++ name) |] |
744 | ffbd9592 | Iustin Pop | return $ FunD (mkName "showJSON") [Clause [] (NormalB body) []] |
745 | 879273e3 | Iustin Pop | |
746 | 12e8358c | Iustin Pop | -- | Generates the load object functionality. |
747 | 879273e3 | Iustin Pop | genLoadObject :: (Field -> Q (Name, Stmt)) |
748 | 879273e3 | Iustin Pop | -> String -> [Field] -> Q (Dec, Dec) |
749 | 879273e3 | Iustin Pop | genLoadObject load_fn sname fields = do |
750 | 879273e3 | Iustin Pop | let name = mkName sname |
751 | 879273e3 | Iustin Pop | funname = mkName $ "load" ++ sname |
752 | 879273e3 | Iustin Pop | arg1 = mkName "v" |
753 | 879273e3 | Iustin Pop | objname = mkName "o" |
754 | 879273e3 | Iustin Pop | opid = mkName "op_id" |
755 | 879273e3 | Iustin Pop | st1 <- bindS (varP objname) [| liftM JSON.fromJSObject |
756 | 879273e3 | Iustin Pop | (JSON.readJSON $(varE arg1)) |] |
757 | 879273e3 | Iustin Pop | fbinds <- mapM load_fn fields |
758 | 879273e3 | Iustin Pop | let (fnames, fstmts) = unzip fbinds |
759 | 879273e3 | Iustin Pop | let cval = foldl (\accu fn -> AppE accu (VarE fn)) (ConE name) fnames |
760 | 879273e3 | Iustin Pop | fstmts' = st1:fstmts ++ [NoBindS (AppE (VarE 'return) cval)] |
761 | 879273e3 | Iustin Pop | sigt <- [t| JSON.JSValue -> JSON.Result $(conT name) |] |
762 | 879273e3 | Iustin Pop | return $ (SigD funname sigt, |
763 | 879273e3 | Iustin Pop | FunD funname [Clause [VarP arg1] (NormalB (DoE fstmts')) []]) |
764 | 879273e3 | Iustin Pop | |
765 | 12e8358c | Iustin Pop | -- | Generates code for loading an object's field. |
766 | 879273e3 | Iustin Pop | loadObjectField :: Field -> Q (Name, Stmt) |
767 | 879273e3 | Iustin Pop | loadObjectField field = do |
768 | 879273e3 | Iustin Pop | let name = fieldVariable field |
769 | d8cb8e13 | Iustin Pop | fvar <- newName name |
770 | 879273e3 | Iustin Pop | -- these are used in all patterns below |
771 | 879273e3 | Iustin Pop | let objvar = varNameE "o" |
772 | 879273e3 | Iustin Pop | objfield = stringE (fieldName field) |
773 | 879273e3 | Iustin Pop | loadexp = |
774 | 9b156883 | Iustin Pop | if fieldIsOptional field /= NotOptional |
775 | 9b156883 | Iustin Pop | -- we treat both optional types the same, since |
776 | 9b156883 | Iustin Pop | -- 'maybeFromObj' can deal with both missing and null values |
777 | 9b156883 | Iustin Pop | -- appropriately (the same) |
778 | 879273e3 | Iustin Pop | then [| $(varNameE "maybeFromObj") $objvar $objfield |] |
779 | 879273e3 | Iustin Pop | else case fieldDefault field of |
780 | 879273e3 | Iustin Pop | Just defv -> |
781 | 879273e3 | Iustin Pop | [| $(varNameE "fromObjWithDefault") $objvar |
782 | 879273e3 | Iustin Pop | $objfield $defv |] |
783 | 879273e3 | Iustin Pop | Nothing -> [| $(varNameE "fromObj") $objvar $objfield |] |
784 | 1c7bda0a | Iustin Pop | bexp <- loadFn field loadexp objvar |
785 | 879273e3 | Iustin Pop | |
786 | 879273e3 | Iustin Pop | return (fvar, BindS (VarP fvar) bexp) |
787 | 879273e3 | Iustin Pop | |
788 | 12e8358c | Iustin Pop | -- | Builds the readJSON instance for a given object name. |
789 | 879273e3 | Iustin Pop | objectReadJSON :: String -> Q Dec |
790 | 879273e3 | Iustin Pop | objectReadJSON name = do |
791 | 879273e3 | Iustin Pop | let s = mkName "s" |
792 | 879273e3 | Iustin Pop | body <- [| case JSON.readJSON $(varE s) of |
793 | 879273e3 | Iustin Pop | JSON.Ok s' -> $(varE .mkName $ "load" ++ name) s' |
794 | 879273e3 | Iustin Pop | JSON.Error e -> |
795 | 879273e3 | Iustin Pop | JSON.Error $ "Can't parse value for type " ++ |
796 | 879273e3 | Iustin Pop | $(stringE name) ++ ": " ++ e |
797 | 879273e3 | Iustin Pop | |] |
798 | 879273e3 | Iustin Pop | return $ FunD (mkName "readJSON") [Clause [VarP s] (NormalB body) []] |
799 | 879273e3 | Iustin Pop | |
800 | 879273e3 | Iustin Pop | -- * Inheritable parameter tables implementation |
801 | 879273e3 | Iustin Pop | |
802 | 879273e3 | Iustin Pop | -- | Compute parameter type names. |
803 | 879273e3 | Iustin Pop | paramTypeNames :: String -> (String, String) |
804 | 879273e3 | Iustin Pop | paramTypeNames root = ("Filled" ++ root ++ "Params", |
805 | 879273e3 | Iustin Pop | "Partial" ++ root ++ "Params") |
806 | 879273e3 | Iustin Pop | |
807 | 879273e3 | Iustin Pop | -- | Compute information about the type of a parameter field. |
808 | 879273e3 | Iustin Pop | paramFieldTypeInfo :: String -> Field -> Q (Name, Strict, Type) |
809 | 879273e3 | Iustin Pop | paramFieldTypeInfo field_pfx fd = do |
810 | 879273e3 | Iustin Pop | t <- actualFieldType fd |
811 | 879273e3 | Iustin Pop | let n = mkName . (++ "P") . (field_pfx ++) . |
812 | 879273e3 | Iustin Pop | fieldRecordName $ fd |
813 | 879273e3 | Iustin Pop | return (n, NotStrict, AppT (ConT ''Maybe) t) |
814 | 879273e3 | Iustin Pop | |
815 | 879273e3 | Iustin Pop | -- | Build a parameter declaration. |
816 | 879273e3 | Iustin Pop | -- |
817 | 879273e3 | Iustin Pop | -- This function builds two different data structures: a /filled/ one, |
818 | 879273e3 | Iustin Pop | -- in which all fields are required, and a /partial/ one, in which all |
819 | 879273e3 | Iustin Pop | -- fields are optional. Due to the current record syntax issues, the |
820 | 879273e3 | Iustin Pop | -- fields need to be named differrently for the two structures, so the |
821 | 879273e3 | Iustin Pop | -- partial ones get a /P/ suffix. |
822 | 879273e3 | Iustin Pop | buildParam :: String -> String -> [Field] -> Q [Dec] |
823 | 879273e3 | Iustin Pop | buildParam sname field_pfx fields = do |
824 | 879273e3 | Iustin Pop | let (sname_f, sname_p) = paramTypeNames sname |
825 | 879273e3 | Iustin Pop | name_f = mkName sname_f |
826 | 879273e3 | Iustin Pop | name_p = mkName sname_p |
827 | 879273e3 | Iustin Pop | fields_f <- mapM (fieldTypeInfo field_pfx) fields |
828 | 879273e3 | Iustin Pop | fields_p <- mapM (paramFieldTypeInfo field_pfx) fields |
829 | 879273e3 | Iustin Pop | let decl_f = RecC name_f fields_f |
830 | 879273e3 | Iustin Pop | decl_p = RecC name_p fields_p |
831 | b1e81520 | Iustin Pop | let declF = DataD [] name_f [] [decl_f] [''Show, ''Read, ''Eq] |
832 | b1e81520 | Iustin Pop | declP = DataD [] name_p [] [decl_p] [''Show, ''Read, ''Eq] |
833 | 879273e3 | Iustin Pop | ser_decls_f <- buildObjectSerialisation sname_f fields |
834 | 879273e3 | Iustin Pop | ser_decls_p <- buildPParamSerialisation sname_p fields |
835 | 879273e3 | Iustin Pop | fill_decls <- fillParam sname field_pfx fields |
836 | 2af78b97 | Iustin Pop | return $ [declF, declP] ++ ser_decls_f ++ ser_decls_p ++ fill_decls ++ |
837 | 2af78b97 | Iustin Pop | buildParamAllFields sname fields ++ |
838 | 2af78b97 | Iustin Pop | buildDictObjectInst name_f sname_f |
839 | 2af78b97 | Iustin Pop | |
840 | 2af78b97 | Iustin Pop | -- | Builds a list of all fields of a parameter. |
841 | 2af78b97 | Iustin Pop | buildParamAllFields :: String -> [Field] -> [Dec] |
842 | 2af78b97 | Iustin Pop | buildParamAllFields sname fields = |
843 | 2af78b97 | Iustin Pop | let vname = mkName ("all" ++ sname ++ "ParamFields") |
844 | 2af78b97 | Iustin Pop | sig = SigD vname (AppT ListT (ConT ''String)) |
845 | 2af78b97 | Iustin Pop | val = ListE $ map (LitE . StringL . fieldName) fields |
846 | 2af78b97 | Iustin Pop | in [sig, ValD (VarP vname) (NormalB val) []] |
847 | 2af78b97 | Iustin Pop | |
848 | 2af78b97 | Iustin Pop | -- | Builds the 'DictObject' instance for a filled parameter. |
849 | 2af78b97 | Iustin Pop | buildDictObjectInst :: Name -> String -> [Dec] |
850 | 2af78b97 | Iustin Pop | buildDictObjectInst name sname = |
851 | 2af78b97 | Iustin Pop | [InstanceD [] (AppT (ConT ''DictObject) (ConT name)) |
852 | 2af78b97 | Iustin Pop | [ValD (VarP 'toDict) (NormalB (VarE (toDictName sname))) []]] |
853 | 879273e3 | Iustin Pop | |
854 | 12e8358c | Iustin Pop | -- | Generates the serialisation for a partial parameter. |
855 | 879273e3 | Iustin Pop | buildPParamSerialisation :: String -> [Field] -> Q [Dec] |
856 | 879273e3 | Iustin Pop | buildPParamSerialisation sname fields = do |
857 | 879273e3 | Iustin Pop | let name = mkName sname |
858 | 879273e3 | Iustin Pop | savedecls <- genSaveObject savePParamField sname fields |
859 | 879273e3 | Iustin Pop | (loadsig, loadfn) <- genLoadObject loadPParamField sname fields |
860 | 879273e3 | Iustin Pop | shjson <- objectShowJSON sname |
861 | 879273e3 | Iustin Pop | rdjson <- objectReadJSON sname |
862 | 879273e3 | Iustin Pop | let instdecl = InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) |
863 | ffbd9592 | Iustin Pop | [rdjson, shjson] |
864 | 879273e3 | Iustin Pop | return $ savedecls ++ [loadsig, loadfn, instdecl] |
865 | 879273e3 | Iustin Pop | |
866 | 12e8358c | Iustin Pop | -- | Generates code to save an optional parameter field. |
867 | 879273e3 | Iustin Pop | savePParamField :: Name -> Field -> Q Exp |
868 | 879273e3 | Iustin Pop | savePParamField fvar field = do |
869 | 879273e3 | Iustin Pop | checkNonOptDef field |
870 | 879273e3 | Iustin Pop | let actualVal = mkName "v" |
871 | 879273e3 | Iustin Pop | normalexpr <- saveObjectField actualVal field |
872 | 879273e3 | Iustin Pop | -- we have to construct the block here manually, because we can't |
873 | 879273e3 | Iustin Pop | -- splice-in-splice |
874 | 879273e3 | Iustin Pop | return $ CaseE (VarE fvar) [ Match (ConP 'Nothing []) |
875 | 879273e3 | Iustin Pop | (NormalB (ConE '[])) [] |
876 | 879273e3 | Iustin Pop | , Match (ConP 'Just [VarP actualVal]) |
877 | 879273e3 | Iustin Pop | (NormalB normalexpr) [] |
878 | 879273e3 | Iustin Pop | ] |
879 | 12e8358c | Iustin Pop | |
880 | 12e8358c | Iustin Pop | -- | Generates code to load an optional parameter field. |
881 | 879273e3 | Iustin Pop | loadPParamField :: Field -> Q (Name, Stmt) |
882 | 879273e3 | Iustin Pop | loadPParamField field = do |
883 | 879273e3 | Iustin Pop | checkNonOptDef field |
884 | 879273e3 | Iustin Pop | let name = fieldName field |
885 | d8cb8e13 | Iustin Pop | fvar <- newName name |
886 | 879273e3 | Iustin Pop | -- these are used in all patterns below |
887 | 879273e3 | Iustin Pop | let objvar = varNameE "o" |
888 | 879273e3 | Iustin Pop | objfield = stringE name |
889 | 879273e3 | Iustin Pop | loadexp = [| $(varNameE "maybeFromObj") $objvar $objfield |] |
890 | 1c7bda0a | Iustin Pop | bexp <- loadFn field loadexp objvar |
891 | 879273e3 | Iustin Pop | return (fvar, BindS (VarP fvar) bexp) |
892 | 879273e3 | Iustin Pop | |
893 | 879273e3 | Iustin Pop | -- | Builds a simple declaration of type @n_x = fromMaybe f_x p_x@. |
894 | 879273e3 | Iustin Pop | buildFromMaybe :: String -> Q Dec |
895 | 879273e3 | Iustin Pop | buildFromMaybe fname = |
896 | 879273e3 | Iustin Pop | valD (varP (mkName $ "n_" ++ fname)) |
897 | 879273e3 | Iustin Pop | (normalB [| $(varNameE "fromMaybe") |
898 | 879273e3 | Iustin Pop | $(varNameE $ "f_" ++ fname) |
899 | 879273e3 | Iustin Pop | $(varNameE $ "p_" ++ fname) |]) [] |
900 | 879273e3 | Iustin Pop | |
901 | 12e8358c | Iustin Pop | -- | Builds a function that executes the filling of partial parameter |
902 | 12e8358c | Iustin Pop | -- from a full copy (similar to Python's fillDict). |
903 | 879273e3 | Iustin Pop | fillParam :: String -> String -> [Field] -> Q [Dec] |
904 | 879273e3 | Iustin Pop | fillParam sname field_pfx fields = do |
905 | 879273e3 | Iustin Pop | let fnames = map (\fd -> field_pfx ++ fieldRecordName fd) fields |
906 | 879273e3 | Iustin Pop | (sname_f, sname_p) = paramTypeNames sname |
907 | 879273e3 | Iustin Pop | oname_f = "fobj" |
908 | 879273e3 | Iustin Pop | oname_p = "pobj" |
909 | 879273e3 | Iustin Pop | name_f = mkName sname_f |
910 | 879273e3 | Iustin Pop | name_p = mkName sname_p |
911 | 879273e3 | Iustin Pop | fun_name = mkName $ "fill" ++ sname ++ "Params" |
912 | 879273e3 | Iustin Pop | le_full = ValD (ConP name_f (map (VarP . mkName . ("f_" ++)) fnames)) |
913 | 879273e3 | Iustin Pop | (NormalB . VarE . mkName $ oname_f) [] |
914 | 879273e3 | Iustin Pop | le_part = ValD (ConP name_p (map (VarP . mkName . ("p_" ++)) fnames)) |
915 | 879273e3 | Iustin Pop | (NormalB . VarE . mkName $ oname_p) [] |
916 | 879273e3 | Iustin Pop | obj_new = foldl (\accu vname -> AppE accu (VarE vname)) (ConE name_f) |
917 | 879273e3 | Iustin Pop | $ map (mkName . ("n_" ++)) fnames |
918 | 879273e3 | Iustin Pop | le_new <- mapM buildFromMaybe fnames |
919 | 879273e3 | Iustin Pop | funt <- [t| $(conT name_f) -> $(conT name_p) -> $(conT name_f) |] |
920 | 879273e3 | Iustin Pop | let sig = SigD fun_name funt |
921 | 879273e3 | Iustin Pop | fclause = Clause [VarP (mkName oname_f), VarP (mkName oname_p)] |
922 | 879273e3 | Iustin Pop | (NormalB $ LetE (le_full:le_part:le_new) obj_new) [] |
923 | 879273e3 | Iustin Pop | fun = FunD fun_name [fclause] |
924 | 879273e3 | Iustin Pop | return [sig, fun] |
925 | ef3ad027 | Iustin Pop | |
926 | ef3ad027 | Iustin Pop | -- * Template code for exceptions |
927 | ef3ad027 | Iustin Pop | |
928 | ef3ad027 | Iustin Pop | -- | Exception simple error message field. |
929 | ef3ad027 | Iustin Pop | excErrMsg :: (String, Q Type) |
930 | ef3ad027 | Iustin Pop | excErrMsg = ("errMsg", [t| String |]) |
931 | ef3ad027 | Iustin Pop | |
932 | ef3ad027 | Iustin Pop | -- | Builds an exception type definition. |
933 | ef3ad027 | Iustin Pop | genException :: String -- ^ Name of new type |
934 | ef3ad027 | Iustin Pop | -> SimpleObject -- ^ Constructor name and parameters |
935 | ef3ad027 | Iustin Pop | -> Q [Dec] |
936 | ef3ad027 | Iustin Pop | genException name cons = do |
937 | ef3ad027 | Iustin Pop | let tname = mkName name |
938 | ef3ad027 | Iustin Pop | declD <- buildSimpleCons tname cons |
939 | ef3ad027 | Iustin Pop | (savesig, savefn) <- genSaveSimpleObj tname ("save" ++ name) cons $ |
940 | ef3ad027 | Iustin Pop | uncurry saveExcCons |
941 | ef3ad027 | Iustin Pop | (loadsig, loadfn) <- genLoadExc tname ("load" ++ name) cons |
942 | ef3ad027 | Iustin Pop | return [declD, loadsig, loadfn, savesig, savefn] |
943 | ef3ad027 | Iustin Pop | |
944 | ef3ad027 | Iustin Pop | -- | Generates the \"save\" clause for an entire exception constructor. |
945 | ef3ad027 | Iustin Pop | -- |
946 | ef3ad027 | Iustin Pop | -- This matches the exception with variables named the same as the |
947 | ef3ad027 | Iustin Pop | -- constructor fields (just so that the spliced in code looks nicer), |
948 | ef3ad027 | Iustin Pop | -- and calls showJSON on it. |
949 | ef3ad027 | Iustin Pop | saveExcCons :: String -- ^ The constructor name |
950 | ef3ad027 | Iustin Pop | -> [SimpleField] -- ^ The parameter definitions for this |
951 | ef3ad027 | Iustin Pop | -- constructor |
952 | ef3ad027 | Iustin Pop | -> Q Clause -- ^ Resulting clause |
953 | ef3ad027 | Iustin Pop | saveExcCons sname fields = do |
954 | ef3ad027 | Iustin Pop | let cname = mkName sname |
955 | ef3ad027 | Iustin Pop | fnames <- mapM (newName . fst) fields |
956 | ef3ad027 | Iustin Pop | let pat = conP cname (map varP fnames) |
957 | ef3ad027 | Iustin Pop | felems = if null fnames |
958 | ef3ad027 | Iustin Pop | then conE '() -- otherwise, empty list has no type |
959 | ef3ad027 | Iustin Pop | else listE $ map (\f -> [| JSON.showJSON $(varE f) |]) fnames |
960 | ef3ad027 | Iustin Pop | let tup = tupE [ litE (stringL sname), felems ] |
961 | ef3ad027 | Iustin Pop | clause [pat] (normalB [| JSON.showJSON $tup |]) [] |
962 | ef3ad027 | Iustin Pop | |
963 | ef3ad027 | Iustin Pop | -- | Generates load code for a single constructor of an exception. |
964 | ef3ad027 | Iustin Pop | -- |
965 | ef3ad027 | Iustin Pop | -- Generates the code (if there's only one argument, we will use a |
966 | ef3ad027 | Iustin Pop | -- list, not a tuple: |
967 | ef3ad027 | Iustin Pop | -- |
968 | ef3ad027 | Iustin Pop | -- @ |
969 | ef3ad027 | Iustin Pop | -- do |
970 | ef3ad027 | Iustin Pop | -- (x1, x2, ...) <- readJSON args |
971 | ef3ad027 | Iustin Pop | -- return $ Cons x1 x2 ... |
972 | ef3ad027 | Iustin Pop | -- @ |
973 | ef3ad027 | Iustin Pop | loadExcConstructor :: Name -> String -> [SimpleField] -> Q Exp |
974 | ef3ad027 | Iustin Pop | loadExcConstructor inname sname fields = do |
975 | ef3ad027 | Iustin Pop | let name = mkName sname |
976 | ef3ad027 | Iustin Pop | f_names <- mapM (newName . fst) fields |
977 | ef3ad027 | Iustin Pop | let read_args = AppE (VarE 'JSON.readJSON) (VarE inname) |
978 | ef3ad027 | Iustin Pop | let binds = case f_names of |
979 | ef3ad027 | Iustin Pop | [x] -> BindS (ListP [VarP x]) |
980 | ef3ad027 | Iustin Pop | _ -> BindS (TupP (map VarP f_names)) |
981 | ef3ad027 | Iustin Pop | cval = foldl (\accu fn -> AppE accu (VarE fn)) (ConE name) f_names |
982 | ef3ad027 | Iustin Pop | return $ DoE [binds read_args, NoBindS (AppE (VarE 'return) cval)] |
983 | ef3ad027 | Iustin Pop | |
984 | ef3ad027 | Iustin Pop | {-| Generates the loadException function. |
985 | ef3ad027 | Iustin Pop | |
986 | ef3ad027 | Iustin Pop | This generates a quite complicated function, along the lines of: |
987 | ef3ad027 | Iustin Pop | |
988 | ef3ad027 | Iustin Pop | @ |
989 | ef3ad027 | Iustin Pop | loadFn (JSArray [JSString name, args]) = case name of |
990 | ef3ad027 | Iustin Pop | "A1" -> do |
991 | ef3ad027 | Iustin Pop | (x1, x2, ...) <- readJSON args |
992 | ef3ad027 | Iustin Pop | return $ A1 x1 x2 ... |
993 | ef3ad027 | Iustin Pop | "a2" -> ... |
994 | ef3ad027 | Iustin Pop | s -> fail $ "Unknown exception" ++ s |
995 | ef3ad027 | Iustin Pop | loadFn v = fail $ "Expected array but got " ++ show v |
996 | ef3ad027 | Iustin Pop | @ |
997 | ef3ad027 | Iustin Pop | -} |
998 | ef3ad027 | Iustin Pop | genLoadExc :: Name -> String -> SimpleObject -> Q (Dec, Dec) |
999 | ef3ad027 | Iustin Pop | genLoadExc tname sname opdefs = do |
1000 | ef3ad027 | Iustin Pop | let fname = mkName sname |
1001 | ef3ad027 | Iustin Pop | exc_name <- newName "name" |
1002 | ef3ad027 | Iustin Pop | exc_args <- newName "args" |
1003 | ef3ad027 | Iustin Pop | exc_else <- newName "s" |
1004 | ef3ad027 | Iustin Pop | arg_else <- newName "v" |
1005 | ef3ad027 | Iustin Pop | fails <- [| fail $ "Unknown exception '" ++ $(varE exc_else) ++ "'" |] |
1006 | ef3ad027 | Iustin Pop | -- default match for unknown exception name |
1007 | ef3ad027 | Iustin Pop | let defmatch = Match (VarP exc_else) (NormalB fails) [] |
1008 | ef3ad027 | Iustin Pop | -- the match results (per-constructor blocks) |
1009 | ef3ad027 | Iustin Pop | str_matches <- |
1010 | ef3ad027 | Iustin Pop | mapM (\(s, params) -> do |
1011 | ef3ad027 | Iustin Pop | body_exp <- loadExcConstructor exc_args s params |
1012 | ef3ad027 | Iustin Pop | return $ Match (LitP (StringL s)) (NormalB body_exp) []) |
1013 | ef3ad027 | Iustin Pop | opdefs |
1014 | ef3ad027 | Iustin Pop | -- the first function clause; we can't use [| |] due to TH |
1015 | ef3ad027 | Iustin Pop | -- limitations, so we have to build the AST by hand |
1016 | ef3ad027 | Iustin Pop | let clause1 = Clause [ConP 'JSON.JSArray |
1017 | ef3ad027 | Iustin Pop | [ListP [ConP 'JSON.JSString [VarP exc_name], |
1018 | ef3ad027 | Iustin Pop | VarP exc_args]]] |
1019 | ef3ad027 | Iustin Pop | (NormalB (CaseE (AppE (VarE 'JSON.fromJSString) |
1020 | ef3ad027 | Iustin Pop | (VarE exc_name)) |
1021 | ef3ad027 | Iustin Pop | (str_matches ++ [defmatch]))) [] |
1022 | ef3ad027 | Iustin Pop | -- the fail expression for the second function clause |
1023 | ef3ad027 | Iustin Pop | fail_type <- [| fail $ "Invalid exception: expected '(string, [args])' " ++ |
1024 | ef3ad027 | Iustin Pop | " but got " ++ show (pp_value $(varE arg_else)) ++ "'" |
1025 | ef3ad027 | Iustin Pop | |] |
1026 | ef3ad027 | Iustin Pop | -- the second function clause |
1027 | ef3ad027 | Iustin Pop | let clause2 = Clause [VarP arg_else] (NormalB fail_type) [] |
1028 | ef3ad027 | Iustin Pop | sigt <- [t| JSON.JSValue -> JSON.Result $(conT tname) |] |
1029 | ef3ad027 | Iustin Pop | return $ (SigD fname sigt, FunD fname [clause1, clause2]) |