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1 | a1505857 | Iustin Pop | {-# LANGUAGE TemplateHaskell #-} |
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2 | e9aaa3c6 | Iustin Pop | |
3 | e9aaa3c6 | Iustin Pop | {-| TemplateHaskell helper for HTools. |
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 | 12c19659 | Iustin Pop | , genOpCode |
37 | a0090487 | Agata Murawska | , genStrOfOp |
38 | a0090487 | Agata Murawska | , genStrOfKey |
39 | a0090487 | Agata Murawska | , genLuxiOp |
40 | 879273e3 | Iustin Pop | , Field |
41 | 879273e3 | Iustin Pop | , simpleField |
42 | 879273e3 | Iustin Pop | , defaultField |
43 | 879273e3 | Iustin Pop | , optionalField |
44 | 879273e3 | Iustin Pop | , renameField |
45 | 879273e3 | Iustin Pop | , customField |
46 | 879273e3 | Iustin Pop | , timeStampFields |
47 | 879273e3 | Iustin Pop | , uuidFields |
48 | 879273e3 | Iustin Pop | , serialFields |
49 | 02cccecd | Iustin Pop | , tagsFields |
50 | 879273e3 | Iustin Pop | , buildObject |
51 | 879273e3 | Iustin Pop | , buildObjectSerialisation |
52 | 879273e3 | Iustin Pop | , buildParam |
53 | e9aaa3c6 | Iustin Pop | ) where |
54 | e9aaa3c6 | Iustin Pop | |
55 | 4b71f30c | Iustin Pop | import Control.Monad (liftM) |
56 | e9aaa3c6 | Iustin Pop | import Data.Char |
57 | 6111e296 | Iustin Pop | import Data.List |
58 | 02cccecd | Iustin Pop | import qualified Data.Set as Set |
59 | e9aaa3c6 | Iustin Pop | import Language.Haskell.TH |
60 | e9aaa3c6 | Iustin Pop | |
61 | e9aaa3c6 | Iustin Pop | import qualified Text.JSON as JSON |
62 | e9aaa3c6 | Iustin Pop | |
63 | 879273e3 | Iustin Pop | -- * Exported types |
64 | 879273e3 | Iustin Pop | |
65 | 879273e3 | Iustin Pop | -- | Serialised field data type. |
66 | 879273e3 | Iustin Pop | data Field = Field { fieldName :: String |
67 | 879273e3 | Iustin Pop | , fieldType :: Q Type |
68 | 879273e3 | Iustin Pop | , fieldRead :: Maybe (Q Exp) |
69 | 879273e3 | Iustin Pop | , fieldShow :: Maybe (Q Exp) |
70 | 879273e3 | Iustin Pop | , fieldDefault :: Maybe (Q Exp) |
71 | 879273e3 | Iustin Pop | , fieldConstr :: Maybe String |
72 | 879273e3 | Iustin Pop | , fieldIsOptional :: Bool |
73 | 879273e3 | Iustin Pop | } |
74 | 879273e3 | Iustin Pop | |
75 | 879273e3 | Iustin Pop | -- | Generates a simple field. |
76 | 879273e3 | Iustin Pop | simpleField :: String -> Q Type -> Field |
77 | 879273e3 | Iustin Pop | simpleField fname ftype = |
78 | 879273e3 | Iustin Pop | Field { fieldName = fname |
79 | 879273e3 | Iustin Pop | , fieldType = ftype |
80 | 879273e3 | Iustin Pop | , fieldRead = Nothing |
81 | 879273e3 | Iustin Pop | , fieldShow = Nothing |
82 | 879273e3 | Iustin Pop | , fieldDefault = Nothing |
83 | 879273e3 | Iustin Pop | , fieldConstr = Nothing |
84 | 879273e3 | Iustin Pop | , fieldIsOptional = False |
85 | 879273e3 | Iustin Pop | } |
86 | 879273e3 | Iustin Pop | |
87 | 879273e3 | Iustin Pop | -- | Sets the renamed constructor field. |
88 | 879273e3 | Iustin Pop | renameField :: String -> Field -> Field |
89 | 879273e3 | Iustin Pop | renameField constrName field = field { fieldConstr = Just constrName } |
90 | 879273e3 | Iustin Pop | |
91 | 879273e3 | Iustin Pop | -- | Sets the default value on a field (makes it optional with a |
92 | 879273e3 | Iustin Pop | -- default value). |
93 | 879273e3 | Iustin Pop | defaultField :: Q Exp -> Field -> Field |
94 | 879273e3 | Iustin Pop | defaultField defval field = field { fieldDefault = Just defval } |
95 | 879273e3 | Iustin Pop | |
96 | 879273e3 | Iustin Pop | -- | Marks a field optional (turning its base type into a Maybe). |
97 | 879273e3 | Iustin Pop | optionalField :: Field -> Field |
98 | 879273e3 | Iustin Pop | optionalField field = field { fieldIsOptional = True } |
99 | 879273e3 | Iustin Pop | |
100 | 879273e3 | Iustin Pop | -- | Sets custom functions on a field. |
101 | c2e60027 | Iustin Pop | customField :: Name -- ^ The name of the read function |
102 | c2e60027 | Iustin Pop | -> Name -- ^ The name of the show function |
103 | c2e60027 | Iustin Pop | -> Field -- ^ The original field |
104 | c2e60027 | Iustin Pop | -> Field -- ^ Updated field |
105 | 879273e3 | Iustin Pop | customField readfn showfn field = |
106 | c2e60027 | Iustin Pop | field { fieldRead = Just (varE readfn), fieldShow = Just (varE showfn) } |
107 | 879273e3 | Iustin Pop | |
108 | 879273e3 | Iustin Pop | fieldRecordName :: Field -> String |
109 | 879273e3 | Iustin Pop | fieldRecordName (Field { fieldName = name, fieldConstr = alias }) = |
110 | 879273e3 | Iustin Pop | maybe (camelCase name) id alias |
111 | 879273e3 | Iustin Pop | |
112 | a1505857 | Iustin Pop | -- | Computes the preferred variable name to use for the value of this |
113 | a1505857 | Iustin Pop | -- field. If the field has a specific constructor name, then we use a |
114 | a1505857 | Iustin Pop | -- first-letter-lowercased version of that; otherwise, we simply use |
115 | a1505857 | Iustin Pop | -- the field name. See also 'fieldRecordName'. |
116 | 879273e3 | Iustin Pop | fieldVariable :: Field -> String |
117 | a1505857 | Iustin Pop | fieldVariable f = |
118 | a1505857 | Iustin Pop | case (fieldConstr f) of |
119 | a1505857 | Iustin Pop | Just name -> ensureLower name |
120 | d8cb8e13 | Iustin Pop | _ -> map (\c -> if c == '-' then '_' else c) $ fieldName f |
121 | 879273e3 | Iustin Pop | |
122 | 879273e3 | Iustin Pop | actualFieldType :: Field -> Q Type |
123 | d5a93a80 | Iustin Pop | actualFieldType f | fieldIsOptional f = [t| Maybe $t |] |
124 | 879273e3 | Iustin Pop | | otherwise = t |
125 | 879273e3 | Iustin Pop | where t = fieldType f |
126 | 879273e3 | Iustin Pop | |
127 | 879273e3 | Iustin Pop | checkNonOptDef :: (Monad m) => Field -> m () |
128 | 879273e3 | Iustin Pop | checkNonOptDef (Field { fieldIsOptional = True, fieldName = name }) = |
129 | 879273e3 | Iustin Pop | fail $ "Optional field " ++ name ++ " used in parameter declaration" |
130 | 879273e3 | Iustin Pop | checkNonOptDef (Field { fieldDefault = (Just _), fieldName = name }) = |
131 | 879273e3 | Iustin Pop | fail $ "Default field " ++ name ++ " used in parameter declaration" |
132 | 879273e3 | Iustin Pop | checkNonOptDef _ = return () |
133 | 879273e3 | Iustin Pop | |
134 | 1c7bda0a | Iustin Pop | -- | Produces the expression that will de-serialise a given |
135 | 1c7bda0a | Iustin Pop | -- field. Since some custom parsing functions might need to use the |
136 | 1c7bda0a | Iustin Pop | -- entire object, we do take and pass the object to any custom read |
137 | 1c7bda0a | Iustin Pop | -- functions. |
138 | 1c7bda0a | Iustin Pop | loadFn :: Field -- ^ The field definition |
139 | 1c7bda0a | Iustin Pop | -> Q Exp -- ^ The value of the field as existing in the JSON message |
140 | 1c7bda0a | Iustin Pop | -> Q Exp -- ^ The entire object in JSON object format |
141 | 1c7bda0a | Iustin Pop | -> Q Exp -- ^ Resulting expression |
142 | 1c7bda0a | Iustin Pop | loadFn (Field { fieldRead = Just readfn }) expr o = [| $expr >>= $readfn $o |] |
143 | 1c7bda0a | Iustin Pop | loadFn _ expr _ = expr |
144 | 879273e3 | Iustin Pop | |
145 | 879273e3 | Iustin Pop | -- * Common field declarations |
146 | 879273e3 | Iustin Pop | |
147 | 879273e3 | Iustin Pop | timeStampFields :: [Field] |
148 | 879273e3 | Iustin Pop | timeStampFields = |
149 | 879273e3 | Iustin Pop | [ defaultField [| 0::Double |] $ simpleField "ctime" [t| Double |] |
150 | 879273e3 | Iustin Pop | , defaultField [| 0::Double |] $ simpleField "mtime" [t| Double |] |
151 | 879273e3 | Iustin Pop | ] |
152 | 879273e3 | Iustin Pop | |
153 | 879273e3 | Iustin Pop | serialFields :: [Field] |
154 | 879273e3 | Iustin Pop | serialFields = |
155 | 879273e3 | Iustin Pop | [ renameField "Serial" $ simpleField "serial_no" [t| Int |] ] |
156 | 879273e3 | Iustin Pop | |
157 | 879273e3 | Iustin Pop | uuidFields :: [Field] |
158 | 879273e3 | Iustin Pop | uuidFields = [ simpleField "uuid" [t| String |] ] |
159 | 879273e3 | Iustin Pop | |
160 | 02cccecd | Iustin Pop | -- | Tag field description. |
161 | 02cccecd | Iustin Pop | tagsFields :: [Field] |
162 | 02cccecd | Iustin Pop | tagsFields = [ defaultField [| Set.empty |] $ |
163 | 02cccecd | Iustin Pop | simpleField "tags" [t| Set.Set String |] ] |
164 | 02cccecd | Iustin Pop | |
165 | 53664e15 | Iustin Pop | -- * Helper functions |
166 | 53664e15 | Iustin Pop | |
167 | e9aaa3c6 | Iustin Pop | -- | Ensure first letter is lowercase. |
168 | e9aaa3c6 | Iustin Pop | -- |
169 | e9aaa3c6 | Iustin Pop | -- Used to convert type name to function prefix, e.g. in @data Aa -> |
170 | 5f828ce4 | Agata Murawska | -- aaToRaw@. |
171 | e9aaa3c6 | Iustin Pop | ensureLower :: String -> String |
172 | e9aaa3c6 | Iustin Pop | ensureLower [] = [] |
173 | e9aaa3c6 | Iustin Pop | ensureLower (x:xs) = toLower x:xs |
174 | e9aaa3c6 | Iustin Pop | |
175 | 879273e3 | Iustin Pop | -- | Ensure first letter is uppercase. |
176 | 879273e3 | Iustin Pop | -- |
177 | 879273e3 | Iustin Pop | -- Used to convert constructor name to component |
178 | 879273e3 | Iustin Pop | ensureUpper :: String -> String |
179 | 879273e3 | Iustin Pop | ensureUpper [] = [] |
180 | 879273e3 | Iustin Pop | ensureUpper (x:xs) = toUpper x:xs |
181 | 879273e3 | Iustin Pop | |
182 | 53664e15 | Iustin Pop | -- | Helper for quoted expressions. |
183 | 53664e15 | Iustin Pop | varNameE :: String -> Q Exp |
184 | 53664e15 | Iustin Pop | varNameE = varE . mkName |
185 | 53664e15 | Iustin Pop | |
186 | 53664e15 | Iustin Pop | -- | showJSON as an expression, for reuse. |
187 | 53664e15 | Iustin Pop | showJSONE :: Q Exp |
188 | 53664e15 | Iustin Pop | showJSONE = varNameE "showJSON" |
189 | 53664e15 | Iustin Pop | |
190 | 5f828ce4 | Agata Murawska | -- | ToRaw function name. |
191 | 5f828ce4 | Agata Murawska | toRawName :: String -> Name |
192 | 5f828ce4 | Agata Murawska | toRawName = mkName . (++ "ToRaw") . ensureLower |
193 | e9aaa3c6 | Iustin Pop | |
194 | 5f828ce4 | Agata Murawska | -- | FromRaw function name. |
195 | 5f828ce4 | Agata Murawska | fromRawName :: String -> Name |
196 | 5f828ce4 | Agata Murawska | fromRawName = mkName . (++ "FromRaw") . ensureLower |
197 | 260d0bda | Agata Murawska | |
198 | 6111e296 | Iustin Pop | -- | Converts a name to it's varE/litE representations. |
199 | 6111e296 | Iustin Pop | -- |
200 | 6111e296 | Iustin Pop | reprE :: Either String Name -> Q Exp |
201 | 53664e15 | Iustin Pop | reprE = either stringE varE |
202 | 53664e15 | Iustin Pop | |
203 | 60de49c3 | Iustin Pop | -- | Smarter function application. |
204 | 60de49c3 | Iustin Pop | -- |
205 | 60de49c3 | Iustin Pop | -- This does simply f x, except that if is 'id', it will skip it, in |
206 | 60de49c3 | Iustin Pop | -- order to generate more readable code when using -ddump-splices. |
207 | 60de49c3 | Iustin Pop | appFn :: Exp -> Exp -> Exp |
208 | 60de49c3 | Iustin Pop | appFn f x | f == VarE 'id = x |
209 | 60de49c3 | Iustin Pop | | otherwise = AppE f x |
210 | 60de49c3 | Iustin Pop | |
211 | 5f828ce4 | Agata Murawska | -- * Template code for simple raw type-equivalent ADTs |
212 | 6111e296 | Iustin Pop | |
213 | e9aaa3c6 | Iustin Pop | -- | Generates a data type declaration. |
214 | e9aaa3c6 | Iustin Pop | -- |
215 | e9aaa3c6 | Iustin Pop | -- The type will have a fixed list of instances. |
216 | e9aaa3c6 | Iustin Pop | strADTDecl :: Name -> [String] -> Dec |
217 | e9aaa3c6 | Iustin Pop | strADTDecl name constructors = |
218 | ebf38064 | Iustin Pop | DataD [] name [] |
219 | ebf38064 | Iustin Pop | (map (flip NormalC [] . mkName) constructors) |
220 | ebf38064 | Iustin Pop | [''Show, ''Read, ''Eq, ''Enum, ''Bounded, ''Ord] |
221 | e9aaa3c6 | Iustin Pop | |
222 | 5f828ce4 | Agata Murawska | -- | Generates a toRaw function. |
223 | e9aaa3c6 | Iustin Pop | -- |
224 | e9aaa3c6 | Iustin Pop | -- This generates a simple function of the form: |
225 | e9aaa3c6 | Iustin Pop | -- |
226 | e9aaa3c6 | Iustin Pop | -- @ |
227 | 5f828ce4 | Agata Murawska | -- nameToRaw :: Name -> /traw/ |
228 | 5f828ce4 | Agata Murawska | -- nameToRaw Cons1 = var1 |
229 | 5f828ce4 | Agata Murawska | -- nameToRaw Cons2 = \"value2\" |
230 | e9aaa3c6 | Iustin Pop | -- @ |
231 | 5f828ce4 | Agata Murawska | genToRaw :: Name -> Name -> Name -> [(String, Either String Name)] -> Q [Dec] |
232 | 5f828ce4 | Agata Murawska | genToRaw traw fname tname constructors = do |
233 | d80e3485 | Iustin Pop | let sigt = AppT (AppT ArrowT (ConT tname)) (ConT traw) |
234 | e9aaa3c6 | Iustin Pop | -- the body clauses, matching on the constructor and returning the |
235 | 5f828ce4 | Agata Murawska | -- raw value |
236 | e9aaa3c6 | Iustin Pop | clauses <- mapM (\(c, v) -> clause [recP (mkName c) []] |
237 | 6111e296 | Iustin Pop | (normalB (reprE v)) []) constructors |
238 | e9aaa3c6 | Iustin Pop | return [SigD fname sigt, FunD fname clauses] |
239 | e9aaa3c6 | Iustin Pop | |
240 | 5f828ce4 | Agata Murawska | -- | Generates a fromRaw function. |
241 | e9aaa3c6 | Iustin Pop | -- |
242 | e9aaa3c6 | Iustin Pop | -- The function generated is monadic and can fail parsing the |
243 | 5f828ce4 | Agata Murawska | -- raw value. It is of the form: |
244 | e9aaa3c6 | Iustin Pop | -- |
245 | e9aaa3c6 | Iustin Pop | -- @ |
246 | 5f828ce4 | Agata Murawska | -- nameFromRaw :: (Monad m) => /traw/ -> m Name |
247 | 5f828ce4 | Agata Murawska | -- nameFromRaw s | s == var1 = Cons1 |
248 | 5f828ce4 | Agata Murawska | -- | s == \"value2\" = Cons2 |
249 | 5f828ce4 | Agata Murawska | -- | otherwise = fail /.../ |
250 | e9aaa3c6 | Iustin Pop | -- @ |
251 | 5f828ce4 | Agata Murawska | genFromRaw :: Name -> Name -> Name -> [(String, Name)] -> Q [Dec] |
252 | 5f828ce4 | Agata Murawska | genFromRaw traw fname tname constructors = do |
253 | e9aaa3c6 | Iustin Pop | -- signature of form (Monad m) => String -> m $name |
254 | 5f828ce4 | Agata Murawska | sigt <- [t| (Monad m) => $(conT traw) -> m $(conT tname) |] |
255 | e9aaa3c6 | Iustin Pop | -- clauses for a guarded pattern |
256 | e9aaa3c6 | Iustin Pop | let varp = mkName "s" |
257 | e9aaa3c6 | Iustin Pop | varpe = varE varp |
258 | e9aaa3c6 | Iustin Pop | clauses <- mapM (\(c, v) -> do |
259 | e9aaa3c6 | Iustin Pop | -- the clause match condition |
260 | e9aaa3c6 | Iustin Pop | g <- normalG [| $varpe == $(varE v) |] |
261 | e9aaa3c6 | Iustin Pop | -- the clause result |
262 | e9aaa3c6 | Iustin Pop | r <- [| return $(conE (mkName c)) |] |
263 | e9aaa3c6 | Iustin Pop | return (g, r)) constructors |
264 | e9aaa3c6 | Iustin Pop | -- the otherwise clause (fallback) |
265 | e9aaa3c6 | Iustin Pop | oth_clause <- do |
266 | e9aaa3c6 | Iustin Pop | g <- normalG [| otherwise |] |
267 | e9aaa3c6 | Iustin Pop | r <- [|fail ("Invalid string value for type " ++ |
268 | 5f828ce4 | Agata Murawska | $(litE (stringL (nameBase tname))) ++ ": " ++ show $varpe) |] |
269 | e9aaa3c6 | Iustin Pop | return (g, r) |
270 | e9aaa3c6 | Iustin Pop | let fun = FunD fname [Clause [VarP varp] |
271 | e9aaa3c6 | Iustin Pop | (GuardedB (clauses++[oth_clause])) []] |
272 | e9aaa3c6 | Iustin Pop | return [SigD fname sigt, fun] |
273 | e9aaa3c6 | Iustin Pop | |
274 | 5f828ce4 | Agata Murawska | -- | Generates a data type from a given raw format. |
275 | e9aaa3c6 | Iustin Pop | -- |
276 | e9aaa3c6 | Iustin Pop | -- The format is expected to multiline. The first line contains the |
277 | e9aaa3c6 | Iustin Pop | -- type name, and the rest of the lines must contain two words: the |
278 | e9aaa3c6 | Iustin Pop | -- constructor name and then the string representation of the |
279 | e9aaa3c6 | Iustin Pop | -- respective constructor. |
280 | e9aaa3c6 | Iustin Pop | -- |
281 | e9aaa3c6 | Iustin Pop | -- The function will generate the data type declaration, and then two |
282 | e9aaa3c6 | Iustin Pop | -- functions: |
283 | e9aaa3c6 | Iustin Pop | -- |
284 | 5f828ce4 | Agata Murawska | -- * /name/ToRaw, which converts the type to a raw type |
285 | e9aaa3c6 | Iustin Pop | -- |
286 | 5f828ce4 | Agata Murawska | -- * /name/FromRaw, which (monadically) converts from a raw type to the type |
287 | e9aaa3c6 | Iustin Pop | -- |
288 | e9aaa3c6 | Iustin Pop | -- Note that this is basically just a custom show/read instance, |
289 | e9aaa3c6 | Iustin Pop | -- nothing else. |
290 | 5f828ce4 | Agata Murawska | declareADT :: Name -> String -> [(String, Name)] -> Q [Dec] |
291 | 5f828ce4 | Agata Murawska | declareADT traw sname cons = do |
292 | e9aaa3c6 | Iustin Pop | let name = mkName sname |
293 | e9aaa3c6 | Iustin Pop | ddecl = strADTDecl name (map fst cons) |
294 | 5f828ce4 | Agata Murawska | -- process cons in the format expected by genToRaw |
295 | 6111e296 | Iustin Pop | cons' = map (\(a, b) -> (a, Right b)) cons |
296 | 5f828ce4 | Agata Murawska | toraw <- genToRaw traw (toRawName sname) name cons' |
297 | 5f828ce4 | Agata Murawska | fromraw <- genFromRaw traw (fromRawName sname) name cons |
298 | 5f828ce4 | Agata Murawska | return $ ddecl:toraw ++ fromraw |
299 | e9aaa3c6 | Iustin Pop | |
300 | 5f828ce4 | Agata Murawska | declareIADT :: String -> [(String, Name)] -> Q [Dec] |
301 | 5f828ce4 | Agata Murawska | declareIADT = declareADT ''Int |
302 | 5f828ce4 | Agata Murawska | |
303 | 5f828ce4 | Agata Murawska | declareSADT :: String -> [(String, Name)] -> Q [Dec] |
304 | 5f828ce4 | Agata Murawska | declareSADT = declareADT ''String |
305 | e9aaa3c6 | Iustin Pop | |
306 | e9aaa3c6 | Iustin Pop | -- | Creates the showJSON member of a JSON instance declaration. |
307 | e9aaa3c6 | Iustin Pop | -- |
308 | e9aaa3c6 | Iustin Pop | -- This will create what is the equivalent of: |
309 | e9aaa3c6 | Iustin Pop | -- |
310 | e9aaa3c6 | Iustin Pop | -- @ |
311 | 5f828ce4 | Agata Murawska | -- showJSON = showJSON . /name/ToRaw |
312 | e9aaa3c6 | Iustin Pop | -- @ |
313 | e9aaa3c6 | Iustin Pop | -- |
314 | e9aaa3c6 | Iustin Pop | -- in an instance JSON /name/ declaration |
315 | ffbd9592 | Iustin Pop | genShowJSON :: String -> Q Dec |
316 | ffbd9592 | Iustin Pop | genShowJSON name = do |
317 | ffbd9592 | Iustin Pop | body <- [| JSON.showJSON . $(varE (toRawName name)) |] |
318 | ffbd9592 | Iustin Pop | return $ FunD (mkName "showJSON") [Clause [] (NormalB body) []] |
319 | e9aaa3c6 | Iustin Pop | |
320 | e9aaa3c6 | Iustin Pop | -- | Creates the readJSON member of a JSON instance declaration. |
321 | e9aaa3c6 | Iustin Pop | -- |
322 | e9aaa3c6 | Iustin Pop | -- This will create what is the equivalent of: |
323 | e9aaa3c6 | Iustin Pop | -- |
324 | e9aaa3c6 | Iustin Pop | -- @ |
325 | e9aaa3c6 | Iustin Pop | -- readJSON s = case readJSON s of |
326 | 5f828ce4 | Agata Murawska | -- Ok s' -> /name/FromRaw s' |
327 | e9aaa3c6 | Iustin Pop | -- Error e -> Error /description/ |
328 | e9aaa3c6 | Iustin Pop | -- @ |
329 | e9aaa3c6 | Iustin Pop | -- |
330 | e9aaa3c6 | Iustin Pop | -- in an instance JSON /name/ declaration |
331 | e9aaa3c6 | Iustin Pop | genReadJSON :: String -> Q Dec |
332 | e9aaa3c6 | Iustin Pop | genReadJSON name = do |
333 | e9aaa3c6 | Iustin Pop | let s = mkName "s" |
334 | e9aaa3c6 | Iustin Pop | body <- [| case JSON.readJSON $(varE s) of |
335 | 5f828ce4 | Agata Murawska | JSON.Ok s' -> $(varE (fromRawName name)) s' |
336 | e9aaa3c6 | Iustin Pop | JSON.Error e -> |
337 | 5f828ce4 | Agata Murawska | JSON.Error $ "Can't parse raw value for type " ++ |
338 | 6bd26f00 | Iustin Pop | $(stringE name) ++ ": " ++ e ++ " from " ++ |
339 | 6bd26f00 | Iustin Pop | show $(varE s) |
340 | e9aaa3c6 | Iustin Pop | |] |
341 | e9aaa3c6 | Iustin Pop | return $ FunD (mkName "readJSON") [Clause [VarP s] (NormalB body) []] |
342 | e9aaa3c6 | Iustin Pop | |
343 | e9aaa3c6 | Iustin Pop | -- | Generates a JSON instance for a given type. |
344 | e9aaa3c6 | Iustin Pop | -- |
345 | 5f828ce4 | Agata Murawska | -- This assumes that the /name/ToRaw and /name/FromRaw functions |
346 | e9aaa3c6 | Iustin Pop | -- have been defined as by the 'declareSADT' function. |
347 | e9aaa3c6 | Iustin Pop | makeJSONInstance :: Name -> Q [Dec] |
348 | e9aaa3c6 | Iustin Pop | makeJSONInstance name = do |
349 | e9aaa3c6 | Iustin Pop | let base = nameBase name |
350 | e9aaa3c6 | Iustin Pop | showJ <- genShowJSON base |
351 | e9aaa3c6 | Iustin Pop | readJ <- genReadJSON base |
352 | ffbd9592 | Iustin Pop | return [InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) [readJ,showJ]] |
353 | 6111e296 | Iustin Pop | |
354 | 53664e15 | Iustin Pop | -- * Template code for opcodes |
355 | 53664e15 | Iustin Pop | |
356 | 6111e296 | Iustin Pop | -- | Transforms a CamelCase string into an_underscore_based_one. |
357 | 6111e296 | Iustin Pop | deCamelCase :: String -> String |
358 | 6111e296 | Iustin Pop | deCamelCase = |
359 | 6111e296 | Iustin Pop | intercalate "_" . map (map toUpper) . groupBy (\_ b -> not $ isUpper b) |
360 | 6111e296 | Iustin Pop | |
361 | 879273e3 | Iustin Pop | -- | Transform an underscore_name into a CamelCase one. |
362 | 879273e3 | Iustin Pop | camelCase :: String -> String |
363 | 879273e3 | Iustin Pop | camelCase = concatMap (ensureUpper . drop 1) . |
364 | d8cb8e13 | Iustin Pop | groupBy (\_ b -> b /= '_' && b /= '-') . ('_':) |
365 | 879273e3 | Iustin Pop | |
366 | 05ff7a00 | Agata Murawska | -- | Computes the name of a given constructor. |
367 | 6111e296 | Iustin Pop | constructorName :: Con -> Q Name |
368 | 6111e296 | Iustin Pop | constructorName (NormalC name _) = return name |
369 | 6111e296 | Iustin Pop | constructorName (RecC name _) = return name |
370 | 6111e296 | Iustin Pop | constructorName x = fail $ "Unhandled constructor " ++ show x |
371 | 6111e296 | Iustin Pop | |
372 | 94518cdb | Iustin Pop | -- | Extract all constructor names from a given type. |
373 | 94518cdb | Iustin Pop | reifyConsNames :: Name -> Q [String] |
374 | 94518cdb | Iustin Pop | reifyConsNames name = do |
375 | 94518cdb | Iustin Pop | reify_result <- reify name |
376 | 94518cdb | Iustin Pop | case reify_result of |
377 | 94518cdb | Iustin Pop | TyConI (DataD _ _ _ cons _) -> mapM (liftM nameBase . constructorName) cons |
378 | 94518cdb | Iustin Pop | o -> fail $ "Unhandled name passed to reifyConsNames, expected\ |
379 | 94518cdb | Iustin Pop | \ type constructor but got '" ++ show o ++ "'" |
380 | 94518cdb | Iustin Pop | |
381 | a0090487 | Agata Murawska | -- | Builds the generic constructor-to-string function. |
382 | 6111e296 | Iustin Pop | -- |
383 | 6111e296 | Iustin Pop | -- This generates a simple function of the following form: |
384 | 6111e296 | Iustin Pop | -- |
385 | 6111e296 | Iustin Pop | -- @ |
386 | a0090487 | Agata Murawska | -- fname (ConStructorOne {}) = trans_fun("ConStructorOne") |
387 | a0090487 | Agata Murawska | -- fname (ConStructorTwo {}) = trans_fun("ConStructorTwo") |
388 | 6111e296 | Iustin Pop | -- @ |
389 | 6111e296 | Iustin Pop | -- |
390 | 6111e296 | Iustin Pop | -- This builds a custom list of name/string pairs and then uses |
391 | 5f828ce4 | Agata Murawska | -- 'genToRaw' to actually generate the function |
392 | a0090487 | Agata Murawska | genConstrToStr :: (String -> String) -> Name -> String -> Q [Dec] |
393 | a0090487 | Agata Murawska | genConstrToStr trans_fun name fname = do |
394 | 94518cdb | Iustin Pop | cnames <- reifyConsNames name |
395 | a0090487 | Agata Murawska | let svalues = map (Left . trans_fun) cnames |
396 | 5f828ce4 | Agata Murawska | genToRaw ''String (mkName fname) name $ zip cnames svalues |
397 | 12c19659 | Iustin Pop | |
398 | a0090487 | Agata Murawska | -- | Constructor-to-string for OpCode. |
399 | a0090487 | Agata Murawska | genOpID :: Name -> String -> Q [Dec] |
400 | a0090487 | Agata Murawska | genOpID = genConstrToStr deCamelCase |
401 | 12c19659 | Iustin Pop | |
402 | 05ff7a00 | Agata Murawska | -- | OpCode parameter (field) type. |
403 | 12c19659 | Iustin Pop | type OpParam = (String, Q Type, Q Exp) |
404 | 12c19659 | Iustin Pop | |
405 | 12c19659 | Iustin Pop | -- | Generates the OpCode data type. |
406 | 12c19659 | Iustin Pop | -- |
407 | 12c19659 | Iustin Pop | -- This takes an opcode logical definition, and builds both the |
408 | 12c19659 | Iustin Pop | -- datatype and the JSON serialisation out of it. We can't use a |
409 | 12c19659 | Iustin Pop | -- generic serialisation since we need to be compatible with Ganeti's |
410 | 12c19659 | Iustin Pop | -- own, so we have a few quirks to work around. |
411 | 12c19659 | Iustin Pop | genOpCode :: String -- ^ Type name to use |
412 | a1505857 | Iustin Pop | -> [(String, [Field])] -- ^ Constructor name and parameters |
413 | 12c19659 | Iustin Pop | -> Q [Dec] |
414 | 12c19659 | Iustin Pop | genOpCode name cons = do |
415 | 12c19659 | Iustin Pop | decl_d <- mapM (\(cname, fields) -> do |
416 | 12c19659 | Iustin Pop | -- we only need the type of the field, without Q |
417 | a1505857 | Iustin Pop | fields' <- mapM actualFieldType fields |
418 | a1505857 | Iustin Pop | let fields'' = zip (repeat NotStrict) fields' |
419 | a1505857 | Iustin Pop | return $ NormalC (mkName cname) fields'') |
420 | 12c19659 | Iustin Pop | cons |
421 | 12c19659 | Iustin Pop | let declD = DataD [] (mkName name) [] decl_d [''Show, ''Read, ''Eq] |
422 | 12c19659 | Iustin Pop | |
423 | 12c19659 | Iustin Pop | (savesig, savefn) <- genSaveOpCode cons |
424 | 12c19659 | Iustin Pop | (loadsig, loadfn) <- genLoadOpCode cons |
425 | 12c19659 | Iustin Pop | return [declD, loadsig, loadfn, savesig, savefn] |
426 | 12c19659 | Iustin Pop | |
427 | 05ff7a00 | Agata Murawska | -- | Checks whether a given parameter is options. |
428 | 12c19659 | Iustin Pop | -- |
429 | 12c19659 | Iustin Pop | -- This requires that it's a 'Maybe'. |
430 | 12c19659 | Iustin Pop | isOptional :: Type -> Bool |
431 | 12c19659 | Iustin Pop | isOptional (AppT (ConT dt) _) | dt == ''Maybe = True |
432 | 12c19659 | Iustin Pop | isOptional _ = False |
433 | 12c19659 | Iustin Pop | |
434 | 12c19659 | Iustin Pop | -- | Generates the \"save\" clause for an entire opcode constructor. |
435 | 12c19659 | Iustin Pop | -- |
436 | 12c19659 | Iustin Pop | -- This matches the opcode with variables named the same as the |
437 | 12c19659 | Iustin Pop | -- constructor fields (just so that the spliced in code looks nicer), |
438 | a1505857 | Iustin Pop | -- and passes those name plus the parameter definition to 'saveObjectField'. |
439 | 12c19659 | Iustin Pop | saveConstructor :: String -- ^ The constructor name |
440 | a1505857 | Iustin Pop | -> [Field] -- ^ The parameter definitions for this |
441 | 12c19659 | Iustin Pop | -- constructor |
442 | 12c19659 | Iustin Pop | -> Q Clause -- ^ Resulting clause |
443 | 12c19659 | Iustin Pop | saveConstructor sname fields = do |
444 | 12c19659 | Iustin Pop | let cname = mkName sname |
445 | d8cb8e13 | Iustin Pop | fnames <- mapM (newName . fieldVariable) fields |
446 | 12c19659 | Iustin Pop | let pat = conP cname (map varP fnames) |
447 | a1505857 | Iustin Pop | let felems = map (uncurry saveObjectField) (zip fnames fields) |
448 | 12c19659 | Iustin Pop | -- now build the OP_ID serialisation |
449 | 53664e15 | Iustin Pop | opid = [| [( $(stringE "OP_ID"), |
450 | a07343b2 | Iustin Pop | JSON.showJSON $(stringE . deCamelCase $ sname) )] |] |
451 | 12c19659 | Iustin Pop | flist = listE (opid:felems) |
452 | 12c19659 | Iustin Pop | -- and finally convert all this to a json object |
453 | 53664e15 | Iustin Pop | flist' = [| $(varNameE "makeObj") (concat $flist) |] |
454 | 12c19659 | Iustin Pop | clause [pat] (normalB flist') [] |
455 | 12c19659 | Iustin Pop | |
456 | 12c19659 | Iustin Pop | -- | Generates the main save opcode function. |
457 | 12c19659 | Iustin Pop | -- |
458 | 12c19659 | Iustin Pop | -- This builds a per-constructor match clause that contains the |
459 | 12c19659 | Iustin Pop | -- respective constructor-serialisation code. |
460 | a1505857 | Iustin Pop | genSaveOpCode :: [(String, [Field])] -> Q (Dec, Dec) |
461 | 12c19659 | Iustin Pop | genSaveOpCode opdefs = do |
462 | 12c19659 | Iustin Pop | cclauses <- mapM (uncurry saveConstructor) opdefs |
463 | 12c19659 | Iustin Pop | let fname = mkName "saveOpCode" |
464 | 12c19659 | Iustin Pop | sigt <- [t| $(conT (mkName "OpCode")) -> JSON.JSValue |] |
465 | 12c19659 | Iustin Pop | return $ (SigD fname sigt, FunD fname cclauses) |
466 | 12c19659 | Iustin Pop | |
467 | a1505857 | Iustin Pop | loadConstructor :: String -> [Field] -> Q Exp |
468 | 12c19659 | Iustin Pop | loadConstructor sname fields = do |
469 | 12c19659 | Iustin Pop | let name = mkName sname |
470 | a1505857 | Iustin Pop | fbinds <- mapM loadObjectField fields |
471 | 12c19659 | Iustin Pop | let (fnames, fstmts) = unzip fbinds |
472 | 12c19659 | Iustin Pop | let cval = foldl (\accu fn -> AppE accu (VarE fn)) (ConE name) fnames |
473 | 12c19659 | Iustin Pop | fstmts' = fstmts ++ [NoBindS (AppE (VarE 'return) cval)] |
474 | 12c19659 | Iustin Pop | return $ DoE fstmts' |
475 | 12c19659 | Iustin Pop | |
476 | a1505857 | Iustin Pop | genLoadOpCode :: [(String, [Field])] -> Q (Dec, Dec) |
477 | 12c19659 | Iustin Pop | genLoadOpCode opdefs = do |
478 | 12c19659 | Iustin Pop | let fname = mkName "loadOpCode" |
479 | 12c19659 | Iustin Pop | arg1 = mkName "v" |
480 | 12c19659 | Iustin Pop | objname = mkName "o" |
481 | 12c19659 | Iustin Pop | opid = mkName "op_id" |
482 | 12c19659 | Iustin Pop | st1 <- bindS (varP objname) [| liftM JSON.fromJSObject |
483 | 12c19659 | Iustin Pop | (JSON.readJSON $(varE arg1)) |] |
484 | 53664e15 | Iustin Pop | st2 <- bindS (varP opid) [| $(varNameE "fromObj") |
485 | 53664e15 | Iustin Pop | $(varE objname) $(stringE "OP_ID") |] |
486 | 12c19659 | Iustin Pop | -- the match results (per-constructor blocks) |
487 | 12c19659 | Iustin Pop | mexps <- mapM (uncurry loadConstructor) opdefs |
488 | 12c19659 | Iustin Pop | fails <- [| fail $ "Unknown opcode " ++ $(varE opid) |] |
489 | 12c19659 | Iustin Pop | let mpats = map (\(me, c) -> |
490 | 12c19659 | Iustin Pop | let mp = LitP . StringL . deCamelCase . fst $ c |
491 | 12c19659 | Iustin Pop | in Match mp (NormalB me) [] |
492 | 12c19659 | Iustin Pop | ) $ zip mexps opdefs |
493 | 12c19659 | Iustin Pop | defmatch = Match WildP (NormalB fails) [] |
494 | 12c19659 | Iustin Pop | cst = NoBindS $ CaseE (VarE opid) $ mpats++[defmatch] |
495 | 12c19659 | Iustin Pop | body = DoE [st1, st2, cst] |
496 | 12c19659 | Iustin Pop | sigt <- [t| JSON.JSValue -> JSON.Result $(conT (mkName "OpCode")) |] |
497 | 12c19659 | Iustin Pop | return $ (SigD fname sigt, FunD fname [Clause [VarP arg1] (NormalB body) []]) |
498 | 12c19659 | Iustin Pop | |
499 | a0090487 | Agata Murawska | -- * Template code for luxi |
500 | a0090487 | Agata Murawska | |
501 | a0090487 | Agata Murawska | -- | Constructor-to-string for LuxiOp. |
502 | a0090487 | Agata Murawska | genStrOfOp :: Name -> String -> Q [Dec] |
503 | a0090487 | Agata Murawska | genStrOfOp = genConstrToStr id |
504 | a0090487 | Agata Murawska | |
505 | a0090487 | Agata Murawska | -- | Constructor-to-string for MsgKeys. |
506 | a0090487 | Agata Murawska | genStrOfKey :: Name -> String -> Q [Dec] |
507 | a0090487 | Agata Murawska | genStrOfKey = genConstrToStr ensureLower |
508 | a0090487 | Agata Murawska | |
509 | a0090487 | Agata Murawska | -- | LuxiOp parameter type. |
510 | 4b71f30c | Iustin Pop | type LuxiParam = (String, Q Type) |
511 | a0090487 | Agata Murawska | |
512 | a0090487 | Agata Murawska | -- | Generates the LuxiOp data type. |
513 | a0090487 | Agata Murawska | -- |
514 | a0090487 | Agata Murawska | -- This takes a Luxi operation definition and builds both the |
515 | a0090487 | Agata Murawska | -- datatype and the function trnasforming the arguments to JSON. |
516 | a0090487 | Agata Murawska | -- We can't use anything less generic, because the way different |
517 | a0090487 | Agata Murawska | -- operations are serialized differs on both parameter- and top-level. |
518 | a0090487 | Agata Murawska | -- |
519 | 4b71f30c | Iustin Pop | -- There are two things to be defined for each parameter: |
520 | a0090487 | Agata Murawska | -- |
521 | a0090487 | Agata Murawska | -- * name |
522 | a0090487 | Agata Murawska | -- |
523 | a0090487 | Agata Murawska | -- * type |
524 | a0090487 | Agata Murawska | -- |
525 | b20cbf06 | Iustin Pop | genLuxiOp :: String -> [(String, [LuxiParam])] -> Q [Dec] |
526 | a0090487 | Agata Murawska | genLuxiOp name cons = do |
527 | b20cbf06 | Iustin Pop | decl_d <- mapM (\(cname, fields) -> do |
528 | 4b71f30c | Iustin Pop | fields' <- mapM (\(_, qt) -> |
529 | a0090487 | Agata Murawska | qt >>= \t -> return (NotStrict, t)) |
530 | a0090487 | Agata Murawska | fields |
531 | a0090487 | Agata Murawska | return $ NormalC (mkName cname) fields') |
532 | a0090487 | Agata Murawska | cons |
533 | cdd495ae | Iustin Pop | let declD = DataD [] (mkName name) [] decl_d [''Show, ''Read, ''Eq] |
534 | a0090487 | Agata Murawska | (savesig, savefn) <- genSaveLuxiOp cons |
535 | 95d0d502 | Iustin Pop | req_defs <- declareSADT "LuxiReq" . |
536 | 95d0d502 | Iustin Pop | map (\(str, _) -> ("Req" ++ str, mkName ("luxiReq" ++ str))) $ |
537 | 95d0d502 | Iustin Pop | cons |
538 | 95d0d502 | Iustin Pop | return $ [declD, savesig, savefn] ++ req_defs |
539 | a0090487 | Agata Murawska | |
540 | 92678b3c | Iustin Pop | -- | Generates the \"save\" expression for a single luxi parameter. |
541 | b20cbf06 | Iustin Pop | saveLuxiField :: Name -> LuxiParam -> Q Exp |
542 | 4b71f30c | Iustin Pop | saveLuxiField fvar (_, qt) = |
543 | 4b71f30c | Iustin Pop | [| JSON.showJSON $(varE fvar) |] |
544 | 92678b3c | Iustin Pop | |
545 | a0090487 | Agata Murawska | -- | Generates the \"save\" clause for entire LuxiOp constructor. |
546 | b20cbf06 | Iustin Pop | saveLuxiConstructor :: (String, [LuxiParam]) -> Q Clause |
547 | b20cbf06 | Iustin Pop | saveLuxiConstructor (sname, fields) = do |
548 | a0090487 | Agata Murawska | let cname = mkName sname |
549 | 4b71f30c | Iustin Pop | fnames = map (mkName . fst) fields |
550 | a0090487 | Agata Murawska | pat = conP cname (map varP fnames) |
551 | b20cbf06 | Iustin Pop | flist = map (uncurry saveLuxiField) (zip fnames fields) |
552 | b20cbf06 | Iustin Pop | finval = if null flist |
553 | b20cbf06 | Iustin Pop | then [| JSON.showJSON () |] |
554 | b20cbf06 | Iustin Pop | else [| JSON.showJSON $(listE flist) |] |
555 | 92678b3c | Iustin Pop | clause [pat] (normalB finval) [] |
556 | a0090487 | Agata Murawska | |
557 | a0090487 | Agata Murawska | -- | Generates the main save LuxiOp function. |
558 | b20cbf06 | Iustin Pop | genSaveLuxiOp :: [(String, [LuxiParam])]-> Q (Dec, Dec) |
559 | a0090487 | Agata Murawska | genSaveLuxiOp opdefs = do |
560 | a0090487 | Agata Murawska | sigt <- [t| $(conT (mkName "LuxiOp")) -> JSON.JSValue |] |
561 | a0090487 | Agata Murawska | let fname = mkName "opToArgs" |
562 | a0090487 | Agata Murawska | cclauses <- mapM saveLuxiConstructor opdefs |
563 | a0090487 | Agata Murawska | return $ (SigD fname sigt, FunD fname cclauses) |
564 | 879273e3 | Iustin Pop | |
565 | 879273e3 | Iustin Pop | -- * "Objects" functionality |
566 | 879273e3 | Iustin Pop | |
567 | 879273e3 | Iustin Pop | -- | Extract the field's declaration from a Field structure. |
568 | 879273e3 | Iustin Pop | fieldTypeInfo :: String -> Field -> Q (Name, Strict, Type) |
569 | 879273e3 | Iustin Pop | fieldTypeInfo field_pfx fd = do |
570 | 879273e3 | Iustin Pop | t <- actualFieldType fd |
571 | 879273e3 | Iustin Pop | let n = mkName . (field_pfx ++) . fieldRecordName $ fd |
572 | 879273e3 | Iustin Pop | return (n, NotStrict, t) |
573 | 879273e3 | Iustin Pop | |
574 | 879273e3 | Iustin Pop | -- | Build an object declaration. |
575 | 879273e3 | Iustin Pop | buildObject :: String -> String -> [Field] -> Q [Dec] |
576 | 879273e3 | Iustin Pop | buildObject sname field_pfx fields = do |
577 | 879273e3 | Iustin Pop | let name = mkName sname |
578 | 879273e3 | Iustin Pop | fields_d <- mapM (fieldTypeInfo field_pfx) fields |
579 | 879273e3 | Iustin Pop | let decl_d = RecC name fields_d |
580 | 3c3c796e | Iustin Pop | let declD = DataD [] name [] [decl_d] [''Show, ''Read, ''Eq] |
581 | 879273e3 | Iustin Pop | ser_decls <- buildObjectSerialisation sname fields |
582 | 879273e3 | Iustin Pop | return $ declD:ser_decls |
583 | 879273e3 | Iustin Pop | |
584 | 879273e3 | Iustin Pop | buildObjectSerialisation :: String -> [Field] -> Q [Dec] |
585 | 879273e3 | Iustin Pop | buildObjectSerialisation sname fields = do |
586 | 879273e3 | Iustin Pop | let name = mkName sname |
587 | 879273e3 | Iustin Pop | savedecls <- genSaveObject saveObjectField sname fields |
588 | 879273e3 | Iustin Pop | (loadsig, loadfn) <- genLoadObject loadObjectField sname fields |
589 | 879273e3 | Iustin Pop | shjson <- objectShowJSON sname |
590 | 879273e3 | Iustin Pop | rdjson <- objectReadJSON sname |
591 | 879273e3 | Iustin Pop | let instdecl = InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) |
592 | ffbd9592 | Iustin Pop | [rdjson, shjson] |
593 | 879273e3 | Iustin Pop | return $ savedecls ++ [loadsig, loadfn, instdecl] |
594 | 879273e3 | Iustin Pop | |
595 | 879273e3 | Iustin Pop | genSaveObject :: (Name -> Field -> Q Exp) |
596 | 879273e3 | Iustin Pop | -> String -> [Field] -> Q [Dec] |
597 | 879273e3 | Iustin Pop | genSaveObject save_fn sname fields = do |
598 | 879273e3 | Iustin Pop | let name = mkName sname |
599 | d8cb8e13 | Iustin Pop | fnames <- mapM (newName . fieldVariable) fields |
600 | 879273e3 | Iustin Pop | let pat = conP name (map varP fnames) |
601 | 879273e3 | Iustin Pop | let tdname = mkName ("toDict" ++ sname) |
602 | 879273e3 | Iustin Pop | tdsigt <- [t| $(conT name) -> [(String, JSON.JSValue)] |] |
603 | 879273e3 | Iustin Pop | |
604 | 879273e3 | Iustin Pop | let felems = map (uncurry save_fn) (zip fnames fields) |
605 | 879273e3 | Iustin Pop | flist = listE felems |
606 | 879273e3 | Iustin Pop | -- and finally convert all this to a json object |
607 | 879273e3 | Iustin Pop | tdlist = [| concat $flist |] |
608 | 879273e3 | Iustin Pop | iname = mkName "i" |
609 | 879273e3 | Iustin Pop | tclause <- clause [pat] (normalB tdlist) [] |
610 | 879273e3 | Iustin Pop | cclause <- [| $(varNameE "makeObj") . $(varE tdname) |] |
611 | 879273e3 | Iustin Pop | let fname = mkName ("save" ++ sname) |
612 | 879273e3 | Iustin Pop | sigt <- [t| $(conT name) -> JSON.JSValue |] |
613 | 879273e3 | Iustin Pop | return [SigD tdname tdsigt, FunD tdname [tclause], |
614 | 879273e3 | Iustin Pop | SigD fname sigt, ValD (VarP fname) (NormalB cclause) []] |
615 | 879273e3 | Iustin Pop | |
616 | 879273e3 | Iustin Pop | saveObjectField :: Name -> Field -> Q Exp |
617 | 879273e3 | Iustin Pop | saveObjectField fvar field |
618 | 879273e3 | Iustin Pop | | fisOptional = [| case $(varE fvar) of |
619 | 879273e3 | Iustin Pop | Nothing -> [] |
620 | a07343b2 | Iustin Pop | Just v -> [( $nameE, JSON.showJSON v)] |
621 | 879273e3 | Iustin Pop | |] |
622 | 879273e3 | Iustin Pop | | otherwise = case fieldShow field of |
623 | a07343b2 | Iustin Pop | Nothing -> [| [( $nameE, JSON.showJSON $fvarE)] |] |
624 | 1c7bda0a | Iustin Pop | Just fn -> [| let (actual, extra) = $fn $fvarE |
625 | 1c7bda0a | Iustin Pop | in extra ++ [( $nameE, JSON.showJSON actual)] |
626 | 1c7bda0a | Iustin Pop | |] |
627 | d5a93a80 | Iustin Pop | where fisOptional = fieldIsOptional field |
628 | 879273e3 | Iustin Pop | nameE = stringE (fieldName field) |
629 | 879273e3 | Iustin Pop | fvarE = varE fvar |
630 | 879273e3 | Iustin Pop | |
631 | ffbd9592 | Iustin Pop | objectShowJSON :: String -> Q Dec |
632 | ffbd9592 | Iustin Pop | objectShowJSON name = do |
633 | ffbd9592 | Iustin Pop | body <- [| JSON.showJSON . $(varE . mkName $ "save" ++ name) |] |
634 | ffbd9592 | Iustin Pop | return $ FunD (mkName "showJSON") [Clause [] (NormalB body) []] |
635 | 879273e3 | Iustin Pop | |
636 | 879273e3 | Iustin Pop | genLoadObject :: (Field -> Q (Name, Stmt)) |
637 | 879273e3 | Iustin Pop | -> String -> [Field] -> Q (Dec, Dec) |
638 | 879273e3 | Iustin Pop | genLoadObject load_fn sname fields = do |
639 | 879273e3 | Iustin Pop | let name = mkName sname |
640 | 879273e3 | Iustin Pop | funname = mkName $ "load" ++ sname |
641 | 879273e3 | Iustin Pop | arg1 = mkName "v" |
642 | 879273e3 | Iustin Pop | objname = mkName "o" |
643 | 879273e3 | Iustin Pop | opid = mkName "op_id" |
644 | 879273e3 | Iustin Pop | st1 <- bindS (varP objname) [| liftM JSON.fromJSObject |
645 | 879273e3 | Iustin Pop | (JSON.readJSON $(varE arg1)) |] |
646 | 879273e3 | Iustin Pop | fbinds <- mapM load_fn fields |
647 | 879273e3 | Iustin Pop | let (fnames, fstmts) = unzip fbinds |
648 | 879273e3 | Iustin Pop | let cval = foldl (\accu fn -> AppE accu (VarE fn)) (ConE name) fnames |
649 | 879273e3 | Iustin Pop | fstmts' = st1:fstmts ++ [NoBindS (AppE (VarE 'return) cval)] |
650 | 879273e3 | Iustin Pop | sigt <- [t| JSON.JSValue -> JSON.Result $(conT name) |] |
651 | 879273e3 | Iustin Pop | return $ (SigD funname sigt, |
652 | 879273e3 | Iustin Pop | FunD funname [Clause [VarP arg1] (NormalB (DoE fstmts')) []]) |
653 | 879273e3 | Iustin Pop | |
654 | 879273e3 | Iustin Pop | loadObjectField :: Field -> Q (Name, Stmt) |
655 | 879273e3 | Iustin Pop | loadObjectField field = do |
656 | 879273e3 | Iustin Pop | let name = fieldVariable field |
657 | d8cb8e13 | Iustin Pop | fvar <- newName name |
658 | 879273e3 | Iustin Pop | -- these are used in all patterns below |
659 | 879273e3 | Iustin Pop | let objvar = varNameE "o" |
660 | 879273e3 | Iustin Pop | objfield = stringE (fieldName field) |
661 | 879273e3 | Iustin Pop | loadexp = |
662 | 879273e3 | Iustin Pop | if fieldIsOptional field |
663 | 879273e3 | Iustin Pop | then [| $(varNameE "maybeFromObj") $objvar $objfield |] |
664 | 879273e3 | Iustin Pop | else case fieldDefault field of |
665 | 879273e3 | Iustin Pop | Just defv -> |
666 | 879273e3 | Iustin Pop | [| $(varNameE "fromObjWithDefault") $objvar |
667 | 879273e3 | Iustin Pop | $objfield $defv |] |
668 | 879273e3 | Iustin Pop | Nothing -> [| $(varNameE "fromObj") $objvar $objfield |] |
669 | 1c7bda0a | Iustin Pop | bexp <- loadFn field loadexp objvar |
670 | 879273e3 | Iustin Pop | |
671 | 879273e3 | Iustin Pop | return (fvar, BindS (VarP fvar) bexp) |
672 | 879273e3 | Iustin Pop | |
673 | 879273e3 | Iustin Pop | objectReadJSON :: String -> Q Dec |
674 | 879273e3 | Iustin Pop | objectReadJSON name = do |
675 | 879273e3 | Iustin Pop | let s = mkName "s" |
676 | 879273e3 | Iustin Pop | body <- [| case JSON.readJSON $(varE s) of |
677 | 879273e3 | Iustin Pop | JSON.Ok s' -> $(varE .mkName $ "load" ++ name) s' |
678 | 879273e3 | Iustin Pop | JSON.Error e -> |
679 | 879273e3 | Iustin Pop | JSON.Error $ "Can't parse value for type " ++ |
680 | 879273e3 | Iustin Pop | $(stringE name) ++ ": " ++ e |
681 | 879273e3 | Iustin Pop | |] |
682 | 879273e3 | Iustin Pop | return $ FunD (mkName "readJSON") [Clause [VarP s] (NormalB body) []] |
683 | 879273e3 | Iustin Pop | |
684 | 879273e3 | Iustin Pop | -- * Inheritable parameter tables implementation |
685 | 879273e3 | Iustin Pop | |
686 | 879273e3 | Iustin Pop | -- | Compute parameter type names. |
687 | 879273e3 | Iustin Pop | paramTypeNames :: String -> (String, String) |
688 | 879273e3 | Iustin Pop | paramTypeNames root = ("Filled" ++ root ++ "Params", |
689 | 879273e3 | Iustin Pop | "Partial" ++ root ++ "Params") |
690 | 879273e3 | Iustin Pop | |
691 | 879273e3 | Iustin Pop | -- | Compute information about the type of a parameter field. |
692 | 879273e3 | Iustin Pop | paramFieldTypeInfo :: String -> Field -> Q (Name, Strict, Type) |
693 | 879273e3 | Iustin Pop | paramFieldTypeInfo field_pfx fd = do |
694 | 879273e3 | Iustin Pop | t <- actualFieldType fd |
695 | 879273e3 | Iustin Pop | let n = mkName . (++ "P") . (field_pfx ++) . |
696 | 879273e3 | Iustin Pop | fieldRecordName $ fd |
697 | 879273e3 | Iustin Pop | return (n, NotStrict, AppT (ConT ''Maybe) t) |
698 | 879273e3 | Iustin Pop | |
699 | 879273e3 | Iustin Pop | -- | Build a parameter declaration. |
700 | 879273e3 | Iustin Pop | -- |
701 | 879273e3 | Iustin Pop | -- This function builds two different data structures: a /filled/ one, |
702 | 879273e3 | Iustin Pop | -- in which all fields are required, and a /partial/ one, in which all |
703 | 879273e3 | Iustin Pop | -- fields are optional. Due to the current record syntax issues, the |
704 | 879273e3 | Iustin Pop | -- fields need to be named differrently for the two structures, so the |
705 | 879273e3 | Iustin Pop | -- partial ones get a /P/ suffix. |
706 | 879273e3 | Iustin Pop | buildParam :: String -> String -> [Field] -> Q [Dec] |
707 | 879273e3 | Iustin Pop | buildParam sname field_pfx fields = do |
708 | 879273e3 | Iustin Pop | let (sname_f, sname_p) = paramTypeNames sname |
709 | 879273e3 | Iustin Pop | name_f = mkName sname_f |
710 | 879273e3 | Iustin Pop | name_p = mkName sname_p |
711 | 879273e3 | Iustin Pop | fields_f <- mapM (fieldTypeInfo field_pfx) fields |
712 | 879273e3 | Iustin Pop | fields_p <- mapM (paramFieldTypeInfo field_pfx) fields |
713 | 879273e3 | Iustin Pop | let decl_f = RecC name_f fields_f |
714 | 879273e3 | Iustin Pop | decl_p = RecC name_p fields_p |
715 | b1e81520 | Iustin Pop | let declF = DataD [] name_f [] [decl_f] [''Show, ''Read, ''Eq] |
716 | b1e81520 | Iustin Pop | declP = DataD [] name_p [] [decl_p] [''Show, ''Read, ''Eq] |
717 | 879273e3 | Iustin Pop | ser_decls_f <- buildObjectSerialisation sname_f fields |
718 | 879273e3 | Iustin Pop | ser_decls_p <- buildPParamSerialisation sname_p fields |
719 | 879273e3 | Iustin Pop | fill_decls <- fillParam sname field_pfx fields |
720 | 879273e3 | Iustin Pop | return $ [declF, declP] ++ ser_decls_f ++ ser_decls_p ++ fill_decls |
721 | 879273e3 | Iustin Pop | |
722 | 879273e3 | Iustin Pop | buildPParamSerialisation :: String -> [Field] -> Q [Dec] |
723 | 879273e3 | Iustin Pop | buildPParamSerialisation sname fields = do |
724 | 879273e3 | Iustin Pop | let name = mkName sname |
725 | 879273e3 | Iustin Pop | savedecls <- genSaveObject savePParamField sname fields |
726 | 879273e3 | Iustin Pop | (loadsig, loadfn) <- genLoadObject loadPParamField sname fields |
727 | 879273e3 | Iustin Pop | shjson <- objectShowJSON sname |
728 | 879273e3 | Iustin Pop | rdjson <- objectReadJSON sname |
729 | 879273e3 | Iustin Pop | let instdecl = InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) |
730 | ffbd9592 | Iustin Pop | [rdjson, shjson] |
731 | 879273e3 | Iustin Pop | return $ savedecls ++ [loadsig, loadfn, instdecl] |
732 | 879273e3 | Iustin Pop | |
733 | 879273e3 | Iustin Pop | savePParamField :: Name -> Field -> Q Exp |
734 | 879273e3 | Iustin Pop | savePParamField fvar field = do |
735 | 879273e3 | Iustin Pop | checkNonOptDef field |
736 | 879273e3 | Iustin Pop | let actualVal = mkName "v" |
737 | 879273e3 | Iustin Pop | normalexpr <- saveObjectField actualVal field |
738 | 879273e3 | Iustin Pop | -- we have to construct the block here manually, because we can't |
739 | 879273e3 | Iustin Pop | -- splice-in-splice |
740 | 879273e3 | Iustin Pop | return $ CaseE (VarE fvar) [ Match (ConP 'Nothing []) |
741 | 879273e3 | Iustin Pop | (NormalB (ConE '[])) [] |
742 | 879273e3 | Iustin Pop | , Match (ConP 'Just [VarP actualVal]) |
743 | 879273e3 | Iustin Pop | (NormalB normalexpr) [] |
744 | 879273e3 | Iustin Pop | ] |
745 | 879273e3 | Iustin Pop | loadPParamField :: Field -> Q (Name, Stmt) |
746 | 879273e3 | Iustin Pop | loadPParamField field = do |
747 | 879273e3 | Iustin Pop | checkNonOptDef field |
748 | 879273e3 | Iustin Pop | let name = fieldName field |
749 | d8cb8e13 | Iustin Pop | fvar <- newName name |
750 | 879273e3 | Iustin Pop | -- these are used in all patterns below |
751 | 879273e3 | Iustin Pop | let objvar = varNameE "o" |
752 | 879273e3 | Iustin Pop | objfield = stringE name |
753 | 879273e3 | Iustin Pop | loadexp = [| $(varNameE "maybeFromObj") $objvar $objfield |] |
754 | 1c7bda0a | Iustin Pop | bexp <- loadFn field loadexp objvar |
755 | 879273e3 | Iustin Pop | return (fvar, BindS (VarP fvar) bexp) |
756 | 879273e3 | Iustin Pop | |
757 | 879273e3 | Iustin Pop | -- | Builds a simple declaration of type @n_x = fromMaybe f_x p_x@. |
758 | 879273e3 | Iustin Pop | buildFromMaybe :: String -> Q Dec |
759 | 879273e3 | Iustin Pop | buildFromMaybe fname = |
760 | 879273e3 | Iustin Pop | valD (varP (mkName $ "n_" ++ fname)) |
761 | 879273e3 | Iustin Pop | (normalB [| $(varNameE "fromMaybe") |
762 | 879273e3 | Iustin Pop | $(varNameE $ "f_" ++ fname) |
763 | 879273e3 | Iustin Pop | $(varNameE $ "p_" ++ fname) |]) [] |
764 | 879273e3 | Iustin Pop | |
765 | 879273e3 | Iustin Pop | fillParam :: String -> String -> [Field] -> Q [Dec] |
766 | 879273e3 | Iustin Pop | fillParam sname field_pfx fields = do |
767 | 879273e3 | Iustin Pop | let fnames = map (\fd -> field_pfx ++ fieldRecordName fd) fields |
768 | 879273e3 | Iustin Pop | (sname_f, sname_p) = paramTypeNames sname |
769 | 879273e3 | Iustin Pop | oname_f = "fobj" |
770 | 879273e3 | Iustin Pop | oname_p = "pobj" |
771 | 879273e3 | Iustin Pop | name_f = mkName sname_f |
772 | 879273e3 | Iustin Pop | name_p = mkName sname_p |
773 | 879273e3 | Iustin Pop | fun_name = mkName $ "fill" ++ sname ++ "Params" |
774 | 879273e3 | Iustin Pop | le_full = ValD (ConP name_f (map (VarP . mkName . ("f_" ++)) fnames)) |
775 | 879273e3 | Iustin Pop | (NormalB . VarE . mkName $ oname_f) [] |
776 | 879273e3 | Iustin Pop | le_part = ValD (ConP name_p (map (VarP . mkName . ("p_" ++)) fnames)) |
777 | 879273e3 | Iustin Pop | (NormalB . VarE . mkName $ oname_p) [] |
778 | 879273e3 | Iustin Pop | obj_new = foldl (\accu vname -> AppE accu (VarE vname)) (ConE name_f) |
779 | 879273e3 | Iustin Pop | $ map (mkName . ("n_" ++)) fnames |
780 | 879273e3 | Iustin Pop | le_new <- mapM buildFromMaybe fnames |
781 | 879273e3 | Iustin Pop | funt <- [t| $(conT name_f) -> $(conT name_p) -> $(conT name_f) |] |
782 | 879273e3 | Iustin Pop | let sig = SigD fun_name funt |
783 | 879273e3 | Iustin Pop | fclause = Clause [VarP (mkName oname_f), VarP (mkName oname_p)] |
784 | 879273e3 | Iustin Pop | (NormalB $ LetE (le_full:le_part:le_new) obj_new) [] |
785 | 879273e3 | Iustin Pop | fun = FunD fun_name [fclause] |
786 | 879273e3 | Iustin Pop | return [sig, fun] |