root / htools / Ganeti / THH.hs @ a292b4e0
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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 | e9aaa3c6 | Iustin Pop | Copyright (C) 2011 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 | , containerField |
46 | 879273e3 | Iustin Pop | , customField |
47 | 879273e3 | Iustin Pop | , timeStampFields |
48 | 879273e3 | Iustin Pop | , uuidFields |
49 | 879273e3 | Iustin Pop | , serialFields |
50 | 879273e3 | Iustin Pop | , buildObject |
51 | 879273e3 | Iustin Pop | , buildObjectSerialisation |
52 | 879273e3 | Iustin Pop | , buildParam |
53 | 879273e3 | Iustin Pop | , Container |
54 | e9aaa3c6 | Iustin Pop | ) where |
55 | e9aaa3c6 | Iustin Pop | |
56 | 879273e3 | Iustin Pop | import Control.Arrow |
57 | 60de49c3 | Iustin Pop | import Control.Monad (liftM, liftM2) |
58 | e9aaa3c6 | Iustin Pop | import Data.Char |
59 | 6111e296 | Iustin Pop | import Data.List |
60 | 879273e3 | Iustin Pop | import qualified Data.Map as M |
61 | e9aaa3c6 | Iustin Pop | import Language.Haskell.TH |
62 | e9aaa3c6 | Iustin Pop | |
63 | e9aaa3c6 | Iustin Pop | import qualified Text.JSON as JSON |
64 | e9aaa3c6 | Iustin Pop | |
65 | 706f7f51 | Iustin Pop | import Ganeti.HTools.JSON |
66 | 706f7f51 | Iustin Pop | |
67 | 879273e3 | Iustin Pop | -- * Exported types |
68 | 879273e3 | Iustin Pop | |
69 | 879273e3 | Iustin Pop | type Container = M.Map String |
70 | 879273e3 | Iustin Pop | |
71 | 879273e3 | Iustin Pop | -- | Serialised field data type. |
72 | 879273e3 | Iustin Pop | data Field = Field { fieldName :: String |
73 | 879273e3 | Iustin Pop | , fieldType :: Q Type |
74 | 879273e3 | Iustin Pop | , fieldRead :: Maybe (Q Exp) |
75 | 879273e3 | Iustin Pop | , fieldShow :: Maybe (Q Exp) |
76 | 879273e3 | Iustin Pop | , fieldDefault :: Maybe (Q Exp) |
77 | 879273e3 | Iustin Pop | , fieldConstr :: Maybe String |
78 | 879273e3 | Iustin Pop | , fieldIsContainer :: Bool |
79 | 879273e3 | Iustin Pop | , fieldIsOptional :: Bool |
80 | 879273e3 | Iustin Pop | } |
81 | 879273e3 | Iustin Pop | |
82 | 879273e3 | Iustin Pop | -- | Generates a simple field. |
83 | 879273e3 | Iustin Pop | simpleField :: String -> Q Type -> Field |
84 | 879273e3 | Iustin Pop | simpleField fname ftype = |
85 | 879273e3 | Iustin Pop | Field { fieldName = fname |
86 | 879273e3 | Iustin Pop | , fieldType = ftype |
87 | 879273e3 | Iustin Pop | , fieldRead = Nothing |
88 | 879273e3 | Iustin Pop | , fieldShow = Nothing |
89 | 879273e3 | Iustin Pop | , fieldDefault = Nothing |
90 | 879273e3 | Iustin Pop | , fieldConstr = Nothing |
91 | 879273e3 | Iustin Pop | , fieldIsContainer = False |
92 | 879273e3 | Iustin Pop | , fieldIsOptional = False |
93 | 879273e3 | Iustin Pop | } |
94 | 879273e3 | Iustin Pop | |
95 | 879273e3 | Iustin Pop | -- | Sets the renamed constructor field. |
96 | 879273e3 | Iustin Pop | renameField :: String -> Field -> Field |
97 | 879273e3 | Iustin Pop | renameField constrName field = field { fieldConstr = Just constrName } |
98 | 879273e3 | Iustin Pop | |
99 | 879273e3 | Iustin Pop | -- | Sets the default value on a field (makes it optional with a |
100 | 879273e3 | Iustin Pop | -- default value). |
101 | 879273e3 | Iustin Pop | defaultField :: Q Exp -> Field -> Field |
102 | 879273e3 | Iustin Pop | defaultField defval field = field { fieldDefault = Just defval } |
103 | 879273e3 | Iustin Pop | |
104 | 879273e3 | Iustin Pop | -- | Marks a field optional (turning its base type into a Maybe). |
105 | 879273e3 | Iustin Pop | optionalField :: Field -> Field |
106 | 879273e3 | Iustin Pop | optionalField field = field { fieldIsOptional = True } |
107 | 879273e3 | Iustin Pop | |
108 | 879273e3 | Iustin Pop | -- | Marks a field as a container. |
109 | 879273e3 | Iustin Pop | containerField :: Field -> Field |
110 | 879273e3 | Iustin Pop | containerField field = field { fieldIsContainer = True } |
111 | 879273e3 | Iustin Pop | |
112 | 879273e3 | Iustin Pop | -- | Sets custom functions on a field. |
113 | 879273e3 | Iustin Pop | customField :: Q Exp -> Q Exp -> Field -> Field |
114 | 879273e3 | Iustin Pop | customField readfn showfn field = |
115 | 879273e3 | Iustin Pop | field { fieldRead = Just readfn, fieldShow = Just showfn } |
116 | 879273e3 | Iustin Pop | |
117 | 879273e3 | Iustin Pop | fieldRecordName :: Field -> String |
118 | 879273e3 | Iustin Pop | fieldRecordName (Field { fieldName = name, fieldConstr = alias }) = |
119 | 879273e3 | Iustin Pop | maybe (camelCase name) id alias |
120 | 879273e3 | Iustin Pop | |
121 | a1505857 | Iustin Pop | -- | Computes the preferred variable name to use for the value of this |
122 | a1505857 | Iustin Pop | -- field. If the field has a specific constructor name, then we use a |
123 | a1505857 | Iustin Pop | -- first-letter-lowercased version of that; otherwise, we simply use |
124 | a1505857 | Iustin Pop | -- the field name. See also 'fieldRecordName'. |
125 | 879273e3 | Iustin Pop | fieldVariable :: Field -> String |
126 | a1505857 | Iustin Pop | fieldVariable f = |
127 | a1505857 | Iustin Pop | case (fieldConstr f) of |
128 | a1505857 | Iustin Pop | Just name -> ensureLower name |
129 | a1505857 | Iustin Pop | _ -> fieldName f |
130 | 879273e3 | Iustin Pop | |
131 | 879273e3 | Iustin Pop | actualFieldType :: Field -> Q Type |
132 | 879273e3 | Iustin Pop | actualFieldType f | fieldIsContainer f = [t| Container $t |] |
133 | 879273e3 | Iustin Pop | | fieldIsOptional f = [t| Maybe $t |] |
134 | 879273e3 | Iustin Pop | | otherwise = t |
135 | 879273e3 | Iustin Pop | where t = fieldType f |
136 | 879273e3 | Iustin Pop | |
137 | 879273e3 | Iustin Pop | checkNonOptDef :: (Monad m) => Field -> m () |
138 | 879273e3 | Iustin Pop | checkNonOptDef (Field { fieldIsOptional = True, fieldName = name }) = |
139 | 879273e3 | Iustin Pop | fail $ "Optional field " ++ name ++ " used in parameter declaration" |
140 | 879273e3 | Iustin Pop | checkNonOptDef (Field { fieldDefault = (Just _), fieldName = name }) = |
141 | 879273e3 | Iustin Pop | fail $ "Default field " ++ name ++ " used in parameter declaration" |
142 | 879273e3 | Iustin Pop | checkNonOptDef _ = return () |
143 | 879273e3 | Iustin Pop | |
144 | 879273e3 | Iustin Pop | loadFn :: Field -> Q Exp -> Q Exp |
145 | 879273e3 | Iustin Pop | loadFn (Field { fieldIsContainer = True }) expr = [| $expr >>= readContainer |] |
146 | 879273e3 | Iustin Pop | loadFn (Field { fieldRead = Just readfn }) expr = [| $expr >>= $readfn |] |
147 | 879273e3 | Iustin Pop | loadFn _ expr = expr |
148 | 879273e3 | Iustin Pop | |
149 | 879273e3 | Iustin Pop | saveFn :: Field -> Q Exp -> Q Exp |
150 | 879273e3 | Iustin Pop | saveFn (Field { fieldIsContainer = True }) expr = [| showContainer $expr |] |
151 | 879273e3 | Iustin Pop | saveFn (Field { fieldRead = Just readfn }) expr = [| $readfn $expr |] |
152 | 879273e3 | Iustin Pop | saveFn _ expr = expr |
153 | 879273e3 | Iustin Pop | |
154 | 879273e3 | Iustin Pop | -- * Common field declarations |
155 | 879273e3 | Iustin Pop | |
156 | 879273e3 | Iustin Pop | timeStampFields :: [Field] |
157 | 879273e3 | Iustin Pop | timeStampFields = |
158 | 879273e3 | Iustin Pop | [ defaultField [| 0::Double |] $ simpleField "ctime" [t| Double |] |
159 | 879273e3 | Iustin Pop | , defaultField [| 0::Double |] $ simpleField "mtime" [t| Double |] |
160 | 879273e3 | Iustin Pop | ] |
161 | 879273e3 | Iustin Pop | |
162 | 879273e3 | Iustin Pop | serialFields :: [Field] |
163 | 879273e3 | Iustin Pop | serialFields = |
164 | 879273e3 | Iustin Pop | [ renameField "Serial" $ simpleField "serial_no" [t| Int |] ] |
165 | 879273e3 | Iustin Pop | |
166 | 879273e3 | Iustin Pop | uuidFields :: [Field] |
167 | 879273e3 | Iustin Pop | uuidFields = [ simpleField "uuid" [t| String |] ] |
168 | 879273e3 | Iustin Pop | |
169 | 53664e15 | Iustin Pop | -- * Helper functions |
170 | 53664e15 | Iustin Pop | |
171 | e9aaa3c6 | Iustin Pop | -- | Ensure first letter is lowercase. |
172 | e9aaa3c6 | Iustin Pop | -- |
173 | e9aaa3c6 | Iustin Pop | -- Used to convert type name to function prefix, e.g. in @data Aa -> |
174 | 5f828ce4 | Agata Murawska | -- aaToRaw@. |
175 | e9aaa3c6 | Iustin Pop | ensureLower :: String -> String |
176 | e9aaa3c6 | Iustin Pop | ensureLower [] = [] |
177 | e9aaa3c6 | Iustin Pop | ensureLower (x:xs) = toLower x:xs |
178 | e9aaa3c6 | Iustin Pop | |
179 | 879273e3 | Iustin Pop | -- | Ensure first letter is uppercase. |
180 | 879273e3 | Iustin Pop | -- |
181 | 879273e3 | Iustin Pop | -- Used to convert constructor name to component |
182 | 879273e3 | Iustin Pop | ensureUpper :: String -> String |
183 | 879273e3 | Iustin Pop | ensureUpper [] = [] |
184 | 879273e3 | Iustin Pop | ensureUpper (x:xs) = toUpper x:xs |
185 | 879273e3 | Iustin Pop | |
186 | 53664e15 | Iustin Pop | -- | Helper for quoted expressions. |
187 | 53664e15 | Iustin Pop | varNameE :: String -> Q Exp |
188 | 53664e15 | Iustin Pop | varNameE = varE . mkName |
189 | 53664e15 | Iustin Pop | |
190 | 53664e15 | Iustin Pop | -- | showJSON as an expression, for reuse. |
191 | 53664e15 | Iustin Pop | showJSONE :: Q Exp |
192 | 53664e15 | Iustin Pop | showJSONE = varNameE "showJSON" |
193 | 53664e15 | Iustin Pop | |
194 | 5f828ce4 | Agata Murawska | -- | ToRaw function name. |
195 | 5f828ce4 | Agata Murawska | toRawName :: String -> Name |
196 | 5f828ce4 | Agata Murawska | toRawName = mkName . (++ "ToRaw") . ensureLower |
197 | e9aaa3c6 | Iustin Pop | |
198 | 5f828ce4 | Agata Murawska | -- | FromRaw function name. |
199 | 5f828ce4 | Agata Murawska | fromRawName :: String -> Name |
200 | 5f828ce4 | Agata Murawska | fromRawName = mkName . (++ "FromRaw") . ensureLower |
201 | 260d0bda | Agata Murawska | |
202 | 6111e296 | Iustin Pop | -- | Converts a name to it's varE/litE representations. |
203 | 6111e296 | Iustin Pop | -- |
204 | 6111e296 | Iustin Pop | reprE :: Either String Name -> Q Exp |
205 | 53664e15 | Iustin Pop | reprE = either stringE varE |
206 | 53664e15 | Iustin Pop | |
207 | 60de49c3 | Iustin Pop | -- | Smarter function application. |
208 | 60de49c3 | Iustin Pop | -- |
209 | 60de49c3 | Iustin Pop | -- This does simply f x, except that if is 'id', it will skip it, in |
210 | 60de49c3 | Iustin Pop | -- order to generate more readable code when using -ddump-splices. |
211 | 60de49c3 | Iustin Pop | appFn :: Exp -> Exp -> Exp |
212 | 60de49c3 | Iustin Pop | appFn f x | f == VarE 'id = x |
213 | 60de49c3 | Iustin Pop | | otherwise = AppE f x |
214 | 60de49c3 | Iustin Pop | |
215 | 879273e3 | Iustin Pop | -- | Container loader |
216 | 706f7f51 | Iustin Pop | readContainer :: (Monad m, JSON.JSON a) => |
217 | 706f7f51 | Iustin Pop | JSON.JSObject JSON.JSValue -> m (Container a) |
218 | 706f7f51 | Iustin Pop | readContainer obj = do |
219 | 706f7f51 | Iustin Pop | let kjvlist = JSON.fromJSObject obj |
220 | 706f7f51 | Iustin Pop | kalist <- mapM (\(k, v) -> fromKeyValue k v >>= \a -> return (k, a)) kjvlist |
221 | 706f7f51 | Iustin Pop | return $ M.fromList kalist |
222 | 879273e3 | Iustin Pop | |
223 | 879273e3 | Iustin Pop | -- | Container dumper |
224 | 879273e3 | Iustin Pop | showContainer :: (JSON.JSON a) => Container a -> JSON.JSValue |
225 | 879273e3 | Iustin Pop | showContainer = JSON.makeObj . map (second JSON.showJSON) . M.toList |
226 | 879273e3 | Iustin Pop | |
227 | 5f828ce4 | Agata Murawska | -- * Template code for simple raw type-equivalent ADTs |
228 | 6111e296 | Iustin Pop | |
229 | e9aaa3c6 | Iustin Pop | -- | Generates a data type declaration. |
230 | e9aaa3c6 | Iustin Pop | -- |
231 | e9aaa3c6 | Iustin Pop | -- The type will have a fixed list of instances. |
232 | e9aaa3c6 | Iustin Pop | strADTDecl :: Name -> [String] -> Dec |
233 | e9aaa3c6 | Iustin Pop | strADTDecl name constructors = |
234 | ebf38064 | Iustin Pop | DataD [] name [] |
235 | ebf38064 | Iustin Pop | (map (flip NormalC [] . mkName) constructors) |
236 | ebf38064 | Iustin Pop | [''Show, ''Read, ''Eq, ''Enum, ''Bounded, ''Ord] |
237 | e9aaa3c6 | Iustin Pop | |
238 | 5f828ce4 | Agata Murawska | -- | Generates a toRaw function. |
239 | e9aaa3c6 | Iustin Pop | -- |
240 | e9aaa3c6 | Iustin Pop | -- This generates a simple function of the form: |
241 | e9aaa3c6 | Iustin Pop | -- |
242 | e9aaa3c6 | Iustin Pop | -- @ |
243 | 5f828ce4 | Agata Murawska | -- nameToRaw :: Name -> /traw/ |
244 | 5f828ce4 | Agata Murawska | -- nameToRaw Cons1 = var1 |
245 | 5f828ce4 | Agata Murawska | -- nameToRaw Cons2 = \"value2\" |
246 | e9aaa3c6 | Iustin Pop | -- @ |
247 | 5f828ce4 | Agata Murawska | genToRaw :: Name -> Name -> Name -> [(String, Either String Name)] -> Q [Dec] |
248 | 5f828ce4 | Agata Murawska | genToRaw traw fname tname constructors = do |
249 | 5f828ce4 | Agata Murawska | sigt <- [t| $(conT tname) -> $(conT traw) |] |
250 | e9aaa3c6 | Iustin Pop | -- the body clauses, matching on the constructor and returning the |
251 | 5f828ce4 | Agata Murawska | -- raw value |
252 | e9aaa3c6 | Iustin Pop | clauses <- mapM (\(c, v) -> clause [recP (mkName c) []] |
253 | 6111e296 | Iustin Pop | (normalB (reprE v)) []) constructors |
254 | e9aaa3c6 | Iustin Pop | return [SigD fname sigt, FunD fname clauses] |
255 | e9aaa3c6 | Iustin Pop | |
256 | 5f828ce4 | Agata Murawska | -- | Generates a fromRaw function. |
257 | e9aaa3c6 | Iustin Pop | -- |
258 | e9aaa3c6 | Iustin Pop | -- The function generated is monadic and can fail parsing the |
259 | 5f828ce4 | Agata Murawska | -- raw value. It is of the form: |
260 | e9aaa3c6 | Iustin Pop | -- |
261 | e9aaa3c6 | Iustin Pop | -- @ |
262 | 5f828ce4 | Agata Murawska | -- nameFromRaw :: (Monad m) => /traw/ -> m Name |
263 | 5f828ce4 | Agata Murawska | -- nameFromRaw s | s == var1 = Cons1 |
264 | 5f828ce4 | Agata Murawska | -- | s == \"value2\" = Cons2 |
265 | 5f828ce4 | Agata Murawska | -- | otherwise = fail /.../ |
266 | e9aaa3c6 | Iustin Pop | -- @ |
267 | 5f828ce4 | Agata Murawska | genFromRaw :: Name -> Name -> Name -> [(String, Name)] -> Q [Dec] |
268 | 5f828ce4 | Agata Murawska | genFromRaw traw fname tname constructors = do |
269 | e9aaa3c6 | Iustin Pop | -- signature of form (Monad m) => String -> m $name |
270 | 5f828ce4 | Agata Murawska | sigt <- [t| (Monad m) => $(conT traw) -> m $(conT tname) |] |
271 | e9aaa3c6 | Iustin Pop | -- clauses for a guarded pattern |
272 | e9aaa3c6 | Iustin Pop | let varp = mkName "s" |
273 | e9aaa3c6 | Iustin Pop | varpe = varE varp |
274 | e9aaa3c6 | Iustin Pop | clauses <- mapM (\(c, v) -> do |
275 | e9aaa3c6 | Iustin Pop | -- the clause match condition |
276 | e9aaa3c6 | Iustin Pop | g <- normalG [| $varpe == $(varE v) |] |
277 | e9aaa3c6 | Iustin Pop | -- the clause result |
278 | e9aaa3c6 | Iustin Pop | r <- [| return $(conE (mkName c)) |] |
279 | e9aaa3c6 | Iustin Pop | return (g, r)) constructors |
280 | e9aaa3c6 | Iustin Pop | -- the otherwise clause (fallback) |
281 | e9aaa3c6 | Iustin Pop | oth_clause <- do |
282 | e9aaa3c6 | Iustin Pop | g <- normalG [| otherwise |] |
283 | e9aaa3c6 | Iustin Pop | r <- [|fail ("Invalid string value for type " ++ |
284 | 5f828ce4 | Agata Murawska | $(litE (stringL (nameBase tname))) ++ ": " ++ show $varpe) |] |
285 | e9aaa3c6 | Iustin Pop | return (g, r) |
286 | e9aaa3c6 | Iustin Pop | let fun = FunD fname [Clause [VarP varp] |
287 | e9aaa3c6 | Iustin Pop | (GuardedB (clauses++[oth_clause])) []] |
288 | e9aaa3c6 | Iustin Pop | return [SigD fname sigt, fun] |
289 | e9aaa3c6 | Iustin Pop | |
290 | 5f828ce4 | Agata Murawska | -- | Generates a data type from a given raw format. |
291 | e9aaa3c6 | Iustin Pop | -- |
292 | e9aaa3c6 | Iustin Pop | -- The format is expected to multiline. The first line contains the |
293 | e9aaa3c6 | Iustin Pop | -- type name, and the rest of the lines must contain two words: the |
294 | e9aaa3c6 | Iustin Pop | -- constructor name and then the string representation of the |
295 | e9aaa3c6 | Iustin Pop | -- respective constructor. |
296 | e9aaa3c6 | Iustin Pop | -- |
297 | e9aaa3c6 | Iustin Pop | -- The function will generate the data type declaration, and then two |
298 | e9aaa3c6 | Iustin Pop | -- functions: |
299 | e9aaa3c6 | Iustin Pop | -- |
300 | 5f828ce4 | Agata Murawska | -- * /name/ToRaw, which converts the type to a raw type |
301 | e9aaa3c6 | Iustin Pop | -- |
302 | 5f828ce4 | Agata Murawska | -- * /name/FromRaw, which (monadically) converts from a raw type to the type |
303 | e9aaa3c6 | Iustin Pop | -- |
304 | e9aaa3c6 | Iustin Pop | -- Note that this is basically just a custom show/read instance, |
305 | e9aaa3c6 | Iustin Pop | -- nothing else. |
306 | 5f828ce4 | Agata Murawska | declareADT :: Name -> String -> [(String, Name)] -> Q [Dec] |
307 | 5f828ce4 | Agata Murawska | declareADT traw sname cons = do |
308 | e9aaa3c6 | Iustin Pop | let name = mkName sname |
309 | e9aaa3c6 | Iustin Pop | ddecl = strADTDecl name (map fst cons) |
310 | 5f828ce4 | Agata Murawska | -- process cons in the format expected by genToRaw |
311 | 6111e296 | Iustin Pop | cons' = map (\(a, b) -> (a, Right b)) cons |
312 | 5f828ce4 | Agata Murawska | toraw <- genToRaw traw (toRawName sname) name cons' |
313 | 5f828ce4 | Agata Murawska | fromraw <- genFromRaw traw (fromRawName sname) name cons |
314 | 5f828ce4 | Agata Murawska | return $ ddecl:toraw ++ fromraw |
315 | e9aaa3c6 | Iustin Pop | |
316 | 5f828ce4 | Agata Murawska | declareIADT :: String -> [(String, Name)] -> Q [Dec] |
317 | 5f828ce4 | Agata Murawska | declareIADT = declareADT ''Int |
318 | 5f828ce4 | Agata Murawska | |
319 | 5f828ce4 | Agata Murawska | declareSADT :: String -> [(String, Name)] -> Q [Dec] |
320 | 5f828ce4 | Agata Murawska | declareSADT = declareADT ''String |
321 | e9aaa3c6 | Iustin Pop | |
322 | e9aaa3c6 | Iustin Pop | -- | Creates the showJSON member of a JSON instance declaration. |
323 | e9aaa3c6 | Iustin Pop | -- |
324 | e9aaa3c6 | Iustin Pop | -- This will create what is the equivalent of: |
325 | e9aaa3c6 | Iustin Pop | -- |
326 | e9aaa3c6 | Iustin Pop | -- @ |
327 | 5f828ce4 | Agata Murawska | -- showJSON = showJSON . /name/ToRaw |
328 | e9aaa3c6 | Iustin Pop | -- @ |
329 | e9aaa3c6 | Iustin Pop | -- |
330 | e9aaa3c6 | Iustin Pop | -- in an instance JSON /name/ declaration |
331 | e9aaa3c6 | Iustin Pop | genShowJSON :: String -> Q [Dec] |
332 | 5f828ce4 | Agata Murawska | genShowJSON name = [d| showJSON = JSON.showJSON . $(varE (toRawName name)) |] |
333 | e9aaa3c6 | Iustin Pop | |
334 | e9aaa3c6 | Iustin Pop | -- | Creates the readJSON member of a JSON instance declaration. |
335 | e9aaa3c6 | Iustin Pop | -- |
336 | e9aaa3c6 | Iustin Pop | -- This will create what is the equivalent of: |
337 | e9aaa3c6 | Iustin Pop | -- |
338 | e9aaa3c6 | Iustin Pop | -- @ |
339 | e9aaa3c6 | Iustin Pop | -- readJSON s = case readJSON s of |
340 | 5f828ce4 | Agata Murawska | -- Ok s' -> /name/FromRaw s' |
341 | e9aaa3c6 | Iustin Pop | -- Error e -> Error /description/ |
342 | e9aaa3c6 | Iustin Pop | -- @ |
343 | e9aaa3c6 | Iustin Pop | -- |
344 | e9aaa3c6 | Iustin Pop | -- in an instance JSON /name/ declaration |
345 | e9aaa3c6 | Iustin Pop | genReadJSON :: String -> Q Dec |
346 | e9aaa3c6 | Iustin Pop | genReadJSON name = do |
347 | e9aaa3c6 | Iustin Pop | let s = mkName "s" |
348 | e9aaa3c6 | Iustin Pop | body <- [| case JSON.readJSON $(varE s) of |
349 | 5f828ce4 | Agata Murawska | JSON.Ok s' -> $(varE (fromRawName name)) s' |
350 | e9aaa3c6 | Iustin Pop | JSON.Error e -> |
351 | 5f828ce4 | Agata Murawska | JSON.Error $ "Can't parse raw value for type " ++ |
352 | 6bd26f00 | Iustin Pop | $(stringE name) ++ ": " ++ e ++ " from " ++ |
353 | 6bd26f00 | Iustin Pop | show $(varE s) |
354 | e9aaa3c6 | Iustin Pop | |] |
355 | e9aaa3c6 | Iustin Pop | return $ FunD (mkName "readJSON") [Clause [VarP s] (NormalB body) []] |
356 | e9aaa3c6 | Iustin Pop | |
357 | e9aaa3c6 | Iustin Pop | -- | Generates a JSON instance for a given type. |
358 | e9aaa3c6 | Iustin Pop | -- |
359 | 5f828ce4 | Agata Murawska | -- This assumes that the /name/ToRaw and /name/FromRaw functions |
360 | e9aaa3c6 | Iustin Pop | -- have been defined as by the 'declareSADT' function. |
361 | e9aaa3c6 | Iustin Pop | makeJSONInstance :: Name -> Q [Dec] |
362 | e9aaa3c6 | Iustin Pop | makeJSONInstance name = do |
363 | e9aaa3c6 | Iustin Pop | let base = nameBase name |
364 | e9aaa3c6 | Iustin Pop | showJ <- genShowJSON base |
365 | e9aaa3c6 | Iustin Pop | readJ <- genReadJSON base |
366 | e9aaa3c6 | Iustin Pop | return [InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) (readJ:showJ)] |
367 | 6111e296 | Iustin Pop | |
368 | 53664e15 | Iustin Pop | -- * Template code for opcodes |
369 | 53664e15 | Iustin Pop | |
370 | 6111e296 | Iustin Pop | -- | Transforms a CamelCase string into an_underscore_based_one. |
371 | 6111e296 | Iustin Pop | deCamelCase :: String -> String |
372 | 6111e296 | Iustin Pop | deCamelCase = |
373 | 6111e296 | Iustin Pop | intercalate "_" . map (map toUpper) . groupBy (\_ b -> not $ isUpper b) |
374 | 6111e296 | Iustin Pop | |
375 | 879273e3 | Iustin Pop | -- | Transform an underscore_name into a CamelCase one. |
376 | 879273e3 | Iustin Pop | camelCase :: String -> String |
377 | 879273e3 | Iustin Pop | camelCase = concatMap (ensureUpper . drop 1) . |
378 | 879273e3 | Iustin Pop | groupBy (\_ b -> b /= '_') . ('_':) |
379 | 879273e3 | Iustin Pop | |
380 | 05ff7a00 | Agata Murawska | -- | Computes the name of a given constructor. |
381 | 6111e296 | Iustin Pop | constructorName :: Con -> Q Name |
382 | 6111e296 | Iustin Pop | constructorName (NormalC name _) = return name |
383 | 6111e296 | Iustin Pop | constructorName (RecC name _) = return name |
384 | 6111e296 | Iustin Pop | constructorName x = fail $ "Unhandled constructor " ++ show x |
385 | 6111e296 | Iustin Pop | |
386 | a0090487 | Agata Murawska | -- | Builds the generic constructor-to-string function. |
387 | 6111e296 | Iustin Pop | -- |
388 | 6111e296 | Iustin Pop | -- This generates a simple function of the following form: |
389 | 6111e296 | Iustin Pop | -- |
390 | 6111e296 | Iustin Pop | -- @ |
391 | a0090487 | Agata Murawska | -- fname (ConStructorOne {}) = trans_fun("ConStructorOne") |
392 | a0090487 | Agata Murawska | -- fname (ConStructorTwo {}) = trans_fun("ConStructorTwo") |
393 | 6111e296 | Iustin Pop | -- @ |
394 | 6111e296 | Iustin Pop | -- |
395 | 6111e296 | Iustin Pop | -- This builds a custom list of name/string pairs and then uses |
396 | 5f828ce4 | Agata Murawska | -- 'genToRaw' to actually generate the function |
397 | a0090487 | Agata Murawska | genConstrToStr :: (String -> String) -> Name -> String -> Q [Dec] |
398 | a0090487 | Agata Murawska | genConstrToStr trans_fun name fname = do |
399 | 6111e296 | Iustin Pop | TyConI (DataD _ _ _ cons _) <- reify name |
400 | 6111e296 | Iustin Pop | cnames <- mapM (liftM nameBase . constructorName) cons |
401 | a0090487 | Agata Murawska | let svalues = map (Left . trans_fun) cnames |
402 | 5f828ce4 | Agata Murawska | genToRaw ''String (mkName fname) name $ zip cnames svalues |
403 | 12c19659 | Iustin Pop | |
404 | a0090487 | Agata Murawska | -- | Constructor-to-string for OpCode. |
405 | a0090487 | Agata Murawska | genOpID :: Name -> String -> Q [Dec] |
406 | a0090487 | Agata Murawska | genOpID = genConstrToStr deCamelCase |
407 | 12c19659 | Iustin Pop | |
408 | 05ff7a00 | Agata Murawska | -- | OpCode parameter (field) type. |
409 | 12c19659 | Iustin Pop | type OpParam = (String, Q Type, Q Exp) |
410 | 12c19659 | Iustin Pop | |
411 | 12c19659 | Iustin Pop | -- | Generates the OpCode data type. |
412 | 12c19659 | Iustin Pop | -- |
413 | 12c19659 | Iustin Pop | -- This takes an opcode logical definition, and builds both the |
414 | 12c19659 | Iustin Pop | -- datatype and the JSON serialisation out of it. We can't use a |
415 | 12c19659 | Iustin Pop | -- generic serialisation since we need to be compatible with Ganeti's |
416 | 12c19659 | Iustin Pop | -- own, so we have a few quirks to work around. |
417 | 12c19659 | Iustin Pop | genOpCode :: String -- ^ Type name to use |
418 | a1505857 | Iustin Pop | -> [(String, [Field])] -- ^ Constructor name and parameters |
419 | 12c19659 | Iustin Pop | -> Q [Dec] |
420 | 12c19659 | Iustin Pop | genOpCode name cons = do |
421 | 12c19659 | Iustin Pop | decl_d <- mapM (\(cname, fields) -> do |
422 | 12c19659 | Iustin Pop | -- we only need the type of the field, without Q |
423 | a1505857 | Iustin Pop | fields' <- mapM actualFieldType fields |
424 | a1505857 | Iustin Pop | let fields'' = zip (repeat NotStrict) fields' |
425 | a1505857 | Iustin Pop | return $ NormalC (mkName cname) fields'') |
426 | 12c19659 | Iustin Pop | cons |
427 | 12c19659 | Iustin Pop | let declD = DataD [] (mkName name) [] decl_d [''Show, ''Read, ''Eq] |
428 | 12c19659 | Iustin Pop | |
429 | 12c19659 | Iustin Pop | (savesig, savefn) <- genSaveOpCode cons |
430 | 12c19659 | Iustin Pop | (loadsig, loadfn) <- genLoadOpCode cons |
431 | 12c19659 | Iustin Pop | return [declD, loadsig, loadfn, savesig, savefn] |
432 | 12c19659 | Iustin Pop | |
433 | 05ff7a00 | Agata Murawska | -- | Checks whether a given parameter is options. |
434 | 12c19659 | Iustin Pop | -- |
435 | 12c19659 | Iustin Pop | -- This requires that it's a 'Maybe'. |
436 | 12c19659 | Iustin Pop | isOptional :: Type -> Bool |
437 | 12c19659 | Iustin Pop | isOptional (AppT (ConT dt) _) | dt == ''Maybe = True |
438 | 12c19659 | Iustin Pop | isOptional _ = False |
439 | 12c19659 | Iustin Pop | |
440 | 12c19659 | Iustin Pop | -- | Generates the \"save\" clause for an entire opcode constructor. |
441 | 12c19659 | Iustin Pop | -- |
442 | 12c19659 | Iustin Pop | -- This matches the opcode with variables named the same as the |
443 | 12c19659 | Iustin Pop | -- constructor fields (just so that the spliced in code looks nicer), |
444 | a1505857 | Iustin Pop | -- and passes those name plus the parameter definition to 'saveObjectField'. |
445 | 12c19659 | Iustin Pop | saveConstructor :: String -- ^ The constructor name |
446 | a1505857 | Iustin Pop | -> [Field] -- ^ The parameter definitions for this |
447 | 12c19659 | Iustin Pop | -- constructor |
448 | 12c19659 | Iustin Pop | -> Q Clause -- ^ Resulting clause |
449 | 12c19659 | Iustin Pop | saveConstructor sname fields = do |
450 | 12c19659 | Iustin Pop | let cname = mkName sname |
451 | a1505857 | Iustin Pop | let fnames = map (mkName . fieldVariable) fields |
452 | 12c19659 | Iustin Pop | let pat = conP cname (map varP fnames) |
453 | a1505857 | Iustin Pop | let felems = map (uncurry saveObjectField) (zip fnames fields) |
454 | 12c19659 | Iustin Pop | -- now build the OP_ID serialisation |
455 | 53664e15 | Iustin Pop | opid = [| [( $(stringE "OP_ID"), |
456 | a07343b2 | Iustin Pop | JSON.showJSON $(stringE . deCamelCase $ sname) )] |] |
457 | 12c19659 | Iustin Pop | flist = listE (opid:felems) |
458 | 12c19659 | Iustin Pop | -- and finally convert all this to a json object |
459 | 53664e15 | Iustin Pop | flist' = [| $(varNameE "makeObj") (concat $flist) |] |
460 | 12c19659 | Iustin Pop | clause [pat] (normalB flist') [] |
461 | 12c19659 | Iustin Pop | |
462 | 12c19659 | Iustin Pop | -- | Generates the main save opcode function. |
463 | 12c19659 | Iustin Pop | -- |
464 | 12c19659 | Iustin Pop | -- This builds a per-constructor match clause that contains the |
465 | 12c19659 | Iustin Pop | -- respective constructor-serialisation code. |
466 | a1505857 | Iustin Pop | genSaveOpCode :: [(String, [Field])] -> Q (Dec, Dec) |
467 | 12c19659 | Iustin Pop | genSaveOpCode opdefs = do |
468 | 12c19659 | Iustin Pop | cclauses <- mapM (uncurry saveConstructor) opdefs |
469 | 12c19659 | Iustin Pop | let fname = mkName "saveOpCode" |
470 | 12c19659 | Iustin Pop | sigt <- [t| $(conT (mkName "OpCode")) -> JSON.JSValue |] |
471 | 12c19659 | Iustin Pop | return $ (SigD fname sigt, FunD fname cclauses) |
472 | 12c19659 | Iustin Pop | |
473 | a1505857 | Iustin Pop | loadConstructor :: String -> [Field] -> Q Exp |
474 | 12c19659 | Iustin Pop | loadConstructor sname fields = do |
475 | 12c19659 | Iustin Pop | let name = mkName sname |
476 | a1505857 | Iustin Pop | fbinds <- mapM loadObjectField fields |
477 | 12c19659 | Iustin Pop | let (fnames, fstmts) = unzip fbinds |
478 | 12c19659 | Iustin Pop | let cval = foldl (\accu fn -> AppE accu (VarE fn)) (ConE name) fnames |
479 | 12c19659 | Iustin Pop | fstmts' = fstmts ++ [NoBindS (AppE (VarE 'return) cval)] |
480 | 12c19659 | Iustin Pop | return $ DoE fstmts' |
481 | 12c19659 | Iustin Pop | |
482 | a1505857 | Iustin Pop | genLoadOpCode :: [(String, [Field])] -> Q (Dec, Dec) |
483 | 12c19659 | Iustin Pop | genLoadOpCode opdefs = do |
484 | 12c19659 | Iustin Pop | let fname = mkName "loadOpCode" |
485 | 12c19659 | Iustin Pop | arg1 = mkName "v" |
486 | 12c19659 | Iustin Pop | objname = mkName "o" |
487 | 12c19659 | Iustin Pop | opid = mkName "op_id" |
488 | 12c19659 | Iustin Pop | st1 <- bindS (varP objname) [| liftM JSON.fromJSObject |
489 | 12c19659 | Iustin Pop | (JSON.readJSON $(varE arg1)) |] |
490 | 53664e15 | Iustin Pop | st2 <- bindS (varP opid) [| $(varNameE "fromObj") |
491 | 53664e15 | Iustin Pop | $(varE objname) $(stringE "OP_ID") |] |
492 | 12c19659 | Iustin Pop | -- the match results (per-constructor blocks) |
493 | 12c19659 | Iustin Pop | mexps <- mapM (uncurry loadConstructor) opdefs |
494 | 12c19659 | Iustin Pop | fails <- [| fail $ "Unknown opcode " ++ $(varE opid) |] |
495 | 12c19659 | Iustin Pop | let mpats = map (\(me, c) -> |
496 | 12c19659 | Iustin Pop | let mp = LitP . StringL . deCamelCase . fst $ c |
497 | 12c19659 | Iustin Pop | in Match mp (NormalB me) [] |
498 | 12c19659 | Iustin Pop | ) $ zip mexps opdefs |
499 | 12c19659 | Iustin Pop | defmatch = Match WildP (NormalB fails) [] |
500 | 12c19659 | Iustin Pop | cst = NoBindS $ CaseE (VarE opid) $ mpats++[defmatch] |
501 | 12c19659 | Iustin Pop | body = DoE [st1, st2, cst] |
502 | 12c19659 | Iustin Pop | sigt <- [t| JSON.JSValue -> JSON.Result $(conT (mkName "OpCode")) |] |
503 | 12c19659 | Iustin Pop | return $ (SigD fname sigt, FunD fname [Clause [VarP arg1] (NormalB body) []]) |
504 | 12c19659 | Iustin Pop | |
505 | a0090487 | Agata Murawska | -- * Template code for luxi |
506 | a0090487 | Agata Murawska | |
507 | a0090487 | Agata Murawska | -- | Constructor-to-string for LuxiOp. |
508 | a0090487 | Agata Murawska | genStrOfOp :: Name -> String -> Q [Dec] |
509 | a0090487 | Agata Murawska | genStrOfOp = genConstrToStr id |
510 | a0090487 | Agata Murawska | |
511 | a0090487 | Agata Murawska | -- | Constructor-to-string for MsgKeys. |
512 | a0090487 | Agata Murawska | genStrOfKey :: Name -> String -> Q [Dec] |
513 | a0090487 | Agata Murawska | genStrOfKey = genConstrToStr ensureLower |
514 | a0090487 | Agata Murawska | |
515 | a0090487 | Agata Murawska | -- | LuxiOp parameter type. |
516 | a0090487 | Agata Murawska | type LuxiParam = (String, Q Type, Q Exp) |
517 | a0090487 | Agata Murawska | |
518 | a0090487 | Agata Murawska | -- | Generates the LuxiOp data type. |
519 | a0090487 | Agata Murawska | -- |
520 | a0090487 | Agata Murawska | -- This takes a Luxi operation definition and builds both the |
521 | a0090487 | Agata Murawska | -- datatype and the function trnasforming the arguments to JSON. |
522 | a0090487 | Agata Murawska | -- We can't use anything less generic, because the way different |
523 | a0090487 | Agata Murawska | -- operations are serialized differs on both parameter- and top-level. |
524 | a0090487 | Agata Murawska | -- |
525 | a0090487 | Agata Murawska | -- There are three things to be defined for each parameter: |
526 | a0090487 | Agata Murawska | -- |
527 | a0090487 | Agata Murawska | -- * name |
528 | a0090487 | Agata Murawska | -- |
529 | a0090487 | Agata Murawska | -- * type |
530 | a0090487 | Agata Murawska | -- |
531 | a0090487 | Agata Murawska | -- * operation; this is the operation performed on the parameter before |
532 | a0090487 | Agata Murawska | -- serialization |
533 | a0090487 | Agata Murawska | -- |
534 | b20cbf06 | Iustin Pop | genLuxiOp :: String -> [(String, [LuxiParam])] -> Q [Dec] |
535 | a0090487 | Agata Murawska | genLuxiOp name cons = do |
536 | b20cbf06 | Iustin Pop | decl_d <- mapM (\(cname, fields) -> do |
537 | a0090487 | Agata Murawska | fields' <- mapM (\(_, qt, _) -> |
538 | a0090487 | Agata Murawska | qt >>= \t -> return (NotStrict, t)) |
539 | a0090487 | Agata Murawska | fields |
540 | a0090487 | Agata Murawska | return $ NormalC (mkName cname) fields') |
541 | a0090487 | Agata Murawska | cons |
542 | a0090487 | Agata Murawska | let declD = DataD [] (mkName name) [] decl_d [''Show, ''Read] |
543 | a0090487 | Agata Murawska | (savesig, savefn) <- genSaveLuxiOp cons |
544 | a0090487 | Agata Murawska | return [declD, savesig, savefn] |
545 | a0090487 | Agata Murawska | |
546 | 92678b3c | Iustin Pop | -- | Generates the \"save\" expression for a single luxi parameter. |
547 | b20cbf06 | Iustin Pop | saveLuxiField :: Name -> LuxiParam -> Q Exp |
548 | b20cbf06 | Iustin Pop | saveLuxiField fvar (_, qt, fn) = |
549 | b20cbf06 | Iustin Pop | [| JSON.showJSON ( $(liftM2 appFn fn $ varE fvar) ) |] |
550 | 92678b3c | Iustin Pop | |
551 | a0090487 | Agata Murawska | -- | Generates the \"save\" clause for entire LuxiOp constructor. |
552 | b20cbf06 | Iustin Pop | saveLuxiConstructor :: (String, [LuxiParam]) -> Q Clause |
553 | b20cbf06 | Iustin Pop | saveLuxiConstructor (sname, fields) = do |
554 | a0090487 | Agata Murawska | let cname = mkName sname |
555 | a0090487 | Agata Murawska | fnames = map (\(nm, _, _) -> mkName nm) fields |
556 | a0090487 | Agata Murawska | pat = conP cname (map varP fnames) |
557 | b20cbf06 | Iustin Pop | flist = map (uncurry saveLuxiField) (zip fnames fields) |
558 | b20cbf06 | Iustin Pop | finval = if null flist |
559 | b20cbf06 | Iustin Pop | then [| JSON.showJSON () |] |
560 | b20cbf06 | Iustin Pop | else [| JSON.showJSON $(listE flist) |] |
561 | 92678b3c | Iustin Pop | clause [pat] (normalB finval) [] |
562 | a0090487 | Agata Murawska | |
563 | a0090487 | Agata Murawska | -- | Generates the main save LuxiOp function. |
564 | b20cbf06 | Iustin Pop | genSaveLuxiOp :: [(String, [LuxiParam])]-> Q (Dec, Dec) |
565 | a0090487 | Agata Murawska | genSaveLuxiOp opdefs = do |
566 | a0090487 | Agata Murawska | sigt <- [t| $(conT (mkName "LuxiOp")) -> JSON.JSValue |] |
567 | a0090487 | Agata Murawska | let fname = mkName "opToArgs" |
568 | a0090487 | Agata Murawska | cclauses <- mapM saveLuxiConstructor opdefs |
569 | a0090487 | Agata Murawska | return $ (SigD fname sigt, FunD fname cclauses) |
570 | 879273e3 | Iustin Pop | |
571 | 879273e3 | Iustin Pop | -- * "Objects" functionality |
572 | 879273e3 | Iustin Pop | |
573 | 879273e3 | Iustin Pop | -- | Extract the field's declaration from a Field structure. |
574 | 879273e3 | Iustin Pop | fieldTypeInfo :: String -> Field -> Q (Name, Strict, Type) |
575 | 879273e3 | Iustin Pop | fieldTypeInfo field_pfx fd = do |
576 | 879273e3 | Iustin Pop | t <- actualFieldType fd |
577 | 879273e3 | Iustin Pop | let n = mkName . (field_pfx ++) . fieldRecordName $ fd |
578 | 879273e3 | Iustin Pop | return (n, NotStrict, t) |
579 | 879273e3 | Iustin Pop | |
580 | 879273e3 | Iustin Pop | -- | Build an object declaration. |
581 | 879273e3 | Iustin Pop | buildObject :: String -> String -> [Field] -> Q [Dec] |
582 | 879273e3 | Iustin Pop | buildObject sname field_pfx fields = do |
583 | 879273e3 | Iustin Pop | let name = mkName sname |
584 | 879273e3 | Iustin Pop | fields_d <- mapM (fieldTypeInfo field_pfx) fields |
585 | 879273e3 | Iustin Pop | let decl_d = RecC name fields_d |
586 | 3c3c796e | Iustin Pop | let declD = DataD [] name [] [decl_d] [''Show, ''Read, ''Eq] |
587 | 879273e3 | Iustin Pop | ser_decls <- buildObjectSerialisation sname fields |
588 | 879273e3 | Iustin Pop | return $ declD:ser_decls |
589 | 879273e3 | Iustin Pop | |
590 | 879273e3 | Iustin Pop | buildObjectSerialisation :: String -> [Field] -> Q [Dec] |
591 | 879273e3 | Iustin Pop | buildObjectSerialisation sname fields = do |
592 | 879273e3 | Iustin Pop | let name = mkName sname |
593 | 879273e3 | Iustin Pop | savedecls <- genSaveObject saveObjectField sname fields |
594 | 879273e3 | Iustin Pop | (loadsig, loadfn) <- genLoadObject loadObjectField sname fields |
595 | 879273e3 | Iustin Pop | shjson <- objectShowJSON sname |
596 | 879273e3 | Iustin Pop | rdjson <- objectReadJSON sname |
597 | 879273e3 | Iustin Pop | let instdecl = InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) |
598 | 879273e3 | Iustin Pop | (rdjson:shjson) |
599 | 879273e3 | Iustin Pop | return $ savedecls ++ [loadsig, loadfn, instdecl] |
600 | 879273e3 | Iustin Pop | |
601 | 879273e3 | Iustin Pop | genSaveObject :: (Name -> Field -> Q Exp) |
602 | 879273e3 | Iustin Pop | -> String -> [Field] -> Q [Dec] |
603 | 879273e3 | Iustin Pop | genSaveObject save_fn sname fields = do |
604 | 879273e3 | Iustin Pop | let name = mkName sname |
605 | 879273e3 | Iustin Pop | let fnames = map (mkName . fieldVariable) fields |
606 | 879273e3 | Iustin Pop | let pat = conP name (map varP fnames) |
607 | 879273e3 | Iustin Pop | let tdname = mkName ("toDict" ++ sname) |
608 | 879273e3 | Iustin Pop | tdsigt <- [t| $(conT name) -> [(String, JSON.JSValue)] |] |
609 | 879273e3 | Iustin Pop | |
610 | 879273e3 | Iustin Pop | let felems = map (uncurry save_fn) (zip fnames fields) |
611 | 879273e3 | Iustin Pop | flist = listE felems |
612 | 879273e3 | Iustin Pop | -- and finally convert all this to a json object |
613 | 879273e3 | Iustin Pop | tdlist = [| concat $flist |] |
614 | 879273e3 | Iustin Pop | iname = mkName "i" |
615 | 879273e3 | Iustin Pop | tclause <- clause [pat] (normalB tdlist) [] |
616 | 879273e3 | Iustin Pop | cclause <- [| $(varNameE "makeObj") . $(varE tdname) |] |
617 | 879273e3 | Iustin Pop | let fname = mkName ("save" ++ sname) |
618 | 879273e3 | Iustin Pop | sigt <- [t| $(conT name) -> JSON.JSValue |] |
619 | 879273e3 | Iustin Pop | return [SigD tdname tdsigt, FunD tdname [tclause], |
620 | 879273e3 | Iustin Pop | SigD fname sigt, ValD (VarP fname) (NormalB cclause) []] |
621 | 879273e3 | Iustin Pop | |
622 | 879273e3 | Iustin Pop | saveObjectField :: Name -> Field -> Q Exp |
623 | 879273e3 | Iustin Pop | saveObjectField fvar field |
624 | a07343b2 | Iustin Pop | | isContainer = [| [( $nameE , JSON.showJSON . showContainer $ $fvarE)] |] |
625 | 879273e3 | Iustin Pop | | fisOptional = [| case $(varE fvar) of |
626 | 879273e3 | Iustin Pop | Nothing -> [] |
627 | a07343b2 | Iustin Pop | Just v -> [( $nameE, JSON.showJSON v)] |
628 | 879273e3 | Iustin Pop | |] |
629 | 879273e3 | Iustin Pop | | otherwise = case fieldShow field of |
630 | a07343b2 | Iustin Pop | Nothing -> [| [( $nameE, JSON.showJSON $fvarE)] |] |
631 | a07343b2 | Iustin Pop | Just fn -> [| [( $nameE, JSON.showJSON . $fn $ $fvarE)] |] |
632 | 879273e3 | Iustin Pop | where isContainer = fieldIsContainer field |
633 | 879273e3 | Iustin Pop | fisOptional = fieldIsOptional field |
634 | 879273e3 | Iustin Pop | nameE = stringE (fieldName field) |
635 | 879273e3 | Iustin Pop | fvarE = varE fvar |
636 | 879273e3 | Iustin Pop | |
637 | 879273e3 | Iustin Pop | objectShowJSON :: String -> Q [Dec] |
638 | 879273e3 | Iustin Pop | objectShowJSON name = |
639 | 879273e3 | Iustin Pop | [d| showJSON = JSON.showJSON . $(varE . mkName $ "save" ++ name) |] |
640 | 879273e3 | Iustin Pop | |
641 | 879273e3 | Iustin Pop | genLoadObject :: (Field -> Q (Name, Stmt)) |
642 | 879273e3 | Iustin Pop | -> String -> [Field] -> Q (Dec, Dec) |
643 | 879273e3 | Iustin Pop | genLoadObject load_fn sname fields = do |
644 | 879273e3 | Iustin Pop | let name = mkName sname |
645 | 879273e3 | Iustin Pop | funname = mkName $ "load" ++ sname |
646 | 879273e3 | Iustin Pop | arg1 = mkName "v" |
647 | 879273e3 | Iustin Pop | objname = mkName "o" |
648 | 879273e3 | Iustin Pop | opid = mkName "op_id" |
649 | 879273e3 | Iustin Pop | st1 <- bindS (varP objname) [| liftM JSON.fromJSObject |
650 | 879273e3 | Iustin Pop | (JSON.readJSON $(varE arg1)) |] |
651 | 879273e3 | Iustin Pop | fbinds <- mapM load_fn fields |
652 | 879273e3 | Iustin Pop | let (fnames, fstmts) = unzip fbinds |
653 | 879273e3 | Iustin Pop | let cval = foldl (\accu fn -> AppE accu (VarE fn)) (ConE name) fnames |
654 | 879273e3 | Iustin Pop | fstmts' = st1:fstmts ++ [NoBindS (AppE (VarE 'return) cval)] |
655 | 879273e3 | Iustin Pop | sigt <- [t| JSON.JSValue -> JSON.Result $(conT name) |] |
656 | 879273e3 | Iustin Pop | return $ (SigD funname sigt, |
657 | 879273e3 | Iustin Pop | FunD funname [Clause [VarP arg1] (NormalB (DoE fstmts')) []]) |
658 | 879273e3 | Iustin Pop | |
659 | 879273e3 | Iustin Pop | loadObjectField :: Field -> Q (Name, Stmt) |
660 | 879273e3 | Iustin Pop | loadObjectField field = do |
661 | 879273e3 | Iustin Pop | let name = fieldVariable field |
662 | 879273e3 | Iustin Pop | fvar = mkName name |
663 | 879273e3 | Iustin Pop | -- these are used in all patterns below |
664 | 879273e3 | Iustin Pop | let objvar = varNameE "o" |
665 | 879273e3 | Iustin Pop | objfield = stringE (fieldName field) |
666 | 879273e3 | Iustin Pop | loadexp = |
667 | 879273e3 | Iustin Pop | if fieldIsOptional field |
668 | 879273e3 | Iustin Pop | then [| $(varNameE "maybeFromObj") $objvar $objfield |] |
669 | 879273e3 | Iustin Pop | else case fieldDefault field of |
670 | 879273e3 | Iustin Pop | Just defv -> |
671 | 879273e3 | Iustin Pop | [| $(varNameE "fromObjWithDefault") $objvar |
672 | 879273e3 | Iustin Pop | $objfield $defv |] |
673 | 879273e3 | Iustin Pop | Nothing -> [| $(varNameE "fromObj") $objvar $objfield |] |
674 | 879273e3 | Iustin Pop | bexp <- loadFn field loadexp |
675 | 879273e3 | Iustin Pop | |
676 | 879273e3 | Iustin Pop | return (fvar, BindS (VarP fvar) bexp) |
677 | 879273e3 | Iustin Pop | |
678 | 879273e3 | Iustin Pop | objectReadJSON :: String -> Q Dec |
679 | 879273e3 | Iustin Pop | objectReadJSON name = do |
680 | 879273e3 | Iustin Pop | let s = mkName "s" |
681 | 879273e3 | Iustin Pop | body <- [| case JSON.readJSON $(varE s) of |
682 | 879273e3 | Iustin Pop | JSON.Ok s' -> $(varE .mkName $ "load" ++ name) s' |
683 | 879273e3 | Iustin Pop | JSON.Error e -> |
684 | 879273e3 | Iustin Pop | JSON.Error $ "Can't parse value for type " ++ |
685 | 879273e3 | Iustin Pop | $(stringE name) ++ ": " ++ e |
686 | 879273e3 | Iustin Pop | |] |
687 | 879273e3 | Iustin Pop | return $ FunD (mkName "readJSON") [Clause [VarP s] (NormalB body) []] |
688 | 879273e3 | Iustin Pop | |
689 | 879273e3 | Iustin Pop | -- * Inheritable parameter tables implementation |
690 | 879273e3 | Iustin Pop | |
691 | 879273e3 | Iustin Pop | -- | Compute parameter type names. |
692 | 879273e3 | Iustin Pop | paramTypeNames :: String -> (String, String) |
693 | 879273e3 | Iustin Pop | paramTypeNames root = ("Filled" ++ root ++ "Params", |
694 | 879273e3 | Iustin Pop | "Partial" ++ root ++ "Params") |
695 | 879273e3 | Iustin Pop | |
696 | 879273e3 | Iustin Pop | -- | Compute information about the type of a parameter field. |
697 | 879273e3 | Iustin Pop | paramFieldTypeInfo :: String -> Field -> Q (Name, Strict, Type) |
698 | 879273e3 | Iustin Pop | paramFieldTypeInfo field_pfx fd = do |
699 | 879273e3 | Iustin Pop | t <- actualFieldType fd |
700 | 879273e3 | Iustin Pop | let n = mkName . (++ "P") . (field_pfx ++) . |
701 | 879273e3 | Iustin Pop | fieldRecordName $ fd |
702 | 879273e3 | Iustin Pop | return (n, NotStrict, AppT (ConT ''Maybe) t) |
703 | 879273e3 | Iustin Pop | |
704 | 879273e3 | Iustin Pop | -- | Build a parameter declaration. |
705 | 879273e3 | Iustin Pop | -- |
706 | 879273e3 | Iustin Pop | -- This function builds two different data structures: a /filled/ one, |
707 | 879273e3 | Iustin Pop | -- in which all fields are required, and a /partial/ one, in which all |
708 | 879273e3 | Iustin Pop | -- fields are optional. Due to the current record syntax issues, the |
709 | 879273e3 | Iustin Pop | -- fields need to be named differrently for the two structures, so the |
710 | 879273e3 | Iustin Pop | -- partial ones get a /P/ suffix. |
711 | 879273e3 | Iustin Pop | buildParam :: String -> String -> [Field] -> Q [Dec] |
712 | 879273e3 | Iustin Pop | buildParam sname field_pfx fields = do |
713 | 879273e3 | Iustin Pop | let (sname_f, sname_p) = paramTypeNames sname |
714 | 879273e3 | Iustin Pop | name_f = mkName sname_f |
715 | 879273e3 | Iustin Pop | name_p = mkName sname_p |
716 | 879273e3 | Iustin Pop | fields_f <- mapM (fieldTypeInfo field_pfx) fields |
717 | 879273e3 | Iustin Pop | fields_p <- mapM (paramFieldTypeInfo field_pfx) fields |
718 | 879273e3 | Iustin Pop | let decl_f = RecC name_f fields_f |
719 | 879273e3 | Iustin Pop | decl_p = RecC name_p fields_p |
720 | 879273e3 | Iustin Pop | let declF = DataD [] name_f [] [decl_f] [''Show, ''Read] |
721 | 879273e3 | Iustin Pop | declP = DataD [] name_p [] [decl_p] [''Show, ''Read] |
722 | 879273e3 | Iustin Pop | ser_decls_f <- buildObjectSerialisation sname_f fields |
723 | 879273e3 | Iustin Pop | ser_decls_p <- buildPParamSerialisation sname_p fields |
724 | 879273e3 | Iustin Pop | fill_decls <- fillParam sname field_pfx fields |
725 | 879273e3 | Iustin Pop | return $ [declF, declP] ++ ser_decls_f ++ ser_decls_p ++ fill_decls |
726 | 879273e3 | Iustin Pop | |
727 | 879273e3 | Iustin Pop | buildPParamSerialisation :: String -> [Field] -> Q [Dec] |
728 | 879273e3 | Iustin Pop | buildPParamSerialisation sname fields = do |
729 | 879273e3 | Iustin Pop | let name = mkName sname |
730 | 879273e3 | Iustin Pop | savedecls <- genSaveObject savePParamField sname fields |
731 | 879273e3 | Iustin Pop | (loadsig, loadfn) <- genLoadObject loadPParamField sname fields |
732 | 879273e3 | Iustin Pop | shjson <- objectShowJSON sname |
733 | 879273e3 | Iustin Pop | rdjson <- objectReadJSON sname |
734 | 879273e3 | Iustin Pop | let instdecl = InstanceD [] (AppT (ConT ''JSON.JSON) (ConT name)) |
735 | 879273e3 | Iustin Pop | (rdjson:shjson) |
736 | 879273e3 | Iustin Pop | return $ savedecls ++ [loadsig, loadfn, instdecl] |
737 | 879273e3 | Iustin Pop | |
738 | 879273e3 | Iustin Pop | savePParamField :: Name -> Field -> Q Exp |
739 | 879273e3 | Iustin Pop | savePParamField fvar field = do |
740 | 879273e3 | Iustin Pop | checkNonOptDef field |
741 | 879273e3 | Iustin Pop | let actualVal = mkName "v" |
742 | 879273e3 | Iustin Pop | normalexpr <- saveObjectField actualVal field |
743 | 879273e3 | Iustin Pop | -- we have to construct the block here manually, because we can't |
744 | 879273e3 | Iustin Pop | -- splice-in-splice |
745 | 879273e3 | Iustin Pop | return $ CaseE (VarE fvar) [ Match (ConP 'Nothing []) |
746 | 879273e3 | Iustin Pop | (NormalB (ConE '[])) [] |
747 | 879273e3 | Iustin Pop | , Match (ConP 'Just [VarP actualVal]) |
748 | 879273e3 | Iustin Pop | (NormalB normalexpr) [] |
749 | 879273e3 | Iustin Pop | ] |
750 | 879273e3 | Iustin Pop | loadPParamField :: Field -> Q (Name, Stmt) |
751 | 879273e3 | Iustin Pop | loadPParamField field = do |
752 | 879273e3 | Iustin Pop | checkNonOptDef field |
753 | 879273e3 | Iustin Pop | let name = fieldName field |
754 | 879273e3 | Iustin Pop | fvar = mkName name |
755 | 879273e3 | Iustin Pop | -- these are used in all patterns below |
756 | 879273e3 | Iustin Pop | let objvar = varNameE "o" |
757 | 879273e3 | Iustin Pop | objfield = stringE name |
758 | 879273e3 | Iustin Pop | loadexp = [| $(varNameE "maybeFromObj") $objvar $objfield |] |
759 | 879273e3 | Iustin Pop | bexp <- loadFn field loadexp |
760 | 879273e3 | Iustin Pop | return (fvar, BindS (VarP fvar) bexp) |
761 | 879273e3 | Iustin Pop | |
762 | 879273e3 | Iustin Pop | -- | Builds a simple declaration of type @n_x = fromMaybe f_x p_x@. |
763 | 879273e3 | Iustin Pop | buildFromMaybe :: String -> Q Dec |
764 | 879273e3 | Iustin Pop | buildFromMaybe fname = |
765 | 879273e3 | Iustin Pop | valD (varP (mkName $ "n_" ++ fname)) |
766 | 879273e3 | Iustin Pop | (normalB [| $(varNameE "fromMaybe") |
767 | 879273e3 | Iustin Pop | $(varNameE $ "f_" ++ fname) |
768 | 879273e3 | Iustin Pop | $(varNameE $ "p_" ++ fname) |]) [] |
769 | 879273e3 | Iustin Pop | |
770 | 879273e3 | Iustin Pop | fillParam :: String -> String -> [Field] -> Q [Dec] |
771 | 879273e3 | Iustin Pop | fillParam sname field_pfx fields = do |
772 | 879273e3 | Iustin Pop | let fnames = map (\fd -> field_pfx ++ fieldRecordName fd) fields |
773 | 879273e3 | Iustin Pop | (sname_f, sname_p) = paramTypeNames sname |
774 | 879273e3 | Iustin Pop | oname_f = "fobj" |
775 | 879273e3 | Iustin Pop | oname_p = "pobj" |
776 | 879273e3 | Iustin Pop | name_f = mkName sname_f |
777 | 879273e3 | Iustin Pop | name_p = mkName sname_p |
778 | 879273e3 | Iustin Pop | fun_name = mkName $ "fill" ++ sname ++ "Params" |
779 | 879273e3 | Iustin Pop | le_full = ValD (ConP name_f (map (VarP . mkName . ("f_" ++)) fnames)) |
780 | 879273e3 | Iustin Pop | (NormalB . VarE . mkName $ oname_f) [] |
781 | 879273e3 | Iustin Pop | le_part = ValD (ConP name_p (map (VarP . mkName . ("p_" ++)) fnames)) |
782 | 879273e3 | Iustin Pop | (NormalB . VarE . mkName $ oname_p) [] |
783 | 879273e3 | Iustin Pop | obj_new = foldl (\accu vname -> AppE accu (VarE vname)) (ConE name_f) |
784 | 879273e3 | Iustin Pop | $ map (mkName . ("n_" ++)) fnames |
785 | 879273e3 | Iustin Pop | le_new <- mapM buildFromMaybe fnames |
786 | 879273e3 | Iustin Pop | funt <- [t| $(conT name_f) -> $(conT name_p) -> $(conT name_f) |] |
787 | 879273e3 | Iustin Pop | let sig = SigD fun_name funt |
788 | 879273e3 | Iustin Pop | fclause = Clause [VarP (mkName oname_f), VarP (mkName oname_p)] |
789 | 879273e3 | Iustin Pop | (NormalB $ LetE (le_full:le_part:le_new) obj_new) [] |
790 | 879273e3 | Iustin Pop | fun = FunD fun_name [fclause] |
791 | 879273e3 | Iustin Pop | return [sig, fun] |