1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
module Spicey.GenerationHelper where

import AbstractCurry.Types
import AbstractCurry.Build
import Char
import Database.ERD
import Database.ERD.Goodies
import Time

------------------------------------------------------------------------
-- lower the first character in a string
lowerFirst :: String -> String
lowerFirst (y:ys) = (toLower y) : ys
lowerFirst []     = [] -- this case should not occur, but one never knows...

-- upper the first character in a string
upperFirst :: String -> String
upperFirst (y:ys) = (toUpper y) : ys
upperFirst []     = [] -- this case should not occur, but one never knows...

------------------------------------------------------------------------
--- Converts a string into a qualified name of the module
--- "Database.KeyDatabaseSQLite".
db :: String -> QName
db f = ("Database.KeyDatabaseSQLite", f)

--- Converts a string into a qualified name of the module "HTML.Base".
html :: String -> QName
html f = ("HTML.Base", f)

--- Converts a string into a qualified name of the module "WUI".
wui :: String -> QName
wui f = ("WUI", f)

-- Some module names:
spiceyModule :: String
spiceyModule = "System.Spicey"

authenticationModule :: String
authenticationModule = "System.Authentication"

-- Name of generic authorization module:
authorizationModule :: String
authorizationModule = "System.Authorization"

sessionInfoModule :: String
sessionInfoModule = "System.SessionInfo"

dataModuleName :: String
dataModuleName = "Config.RoutesData"

mappingModuleName :: String
mappingModuleName = "Config.ControllerMapping"

--- Name of EntitiesToHtml module.
entitiesToHtmlModule :: String -> String
entitiesToHtmlModule erdname = "View." ++ erdname ++ "EntitiesToHtml"

bootstrapModule :: String
bootstrapModule = "HTML.Styles.Bootstrap3"

-- Name of hrefButton operation:
hrefButtonName :: QName
hrefButtonName = (bootstrapModule,"hrefButton")

relatedRelation :: String -> Relationship -> String
relatedRelation en (Relationship _ [REnd en1 _ _, REnd en2 _ _]) =
  if en==en1 then en2 else en1

relationshipsForEntityName :: String -> [Relationship] -> [Relationship]
relationshipsForEntityName ename rels = filter endsIn rels
 where
  endsIn (Relationship _ ends) = any (\ (REnd n _ _) -> ename == n) ends

-- An entity is generated (to represent many-to-many relations)
-- if all attributes are foreign keys
isGenerated :: Entity -> Bool
isGenerated (Entity _ attrs) = null (filter (not . isForeignKey) attrs)

notPKey :: Attribute -> Bool
notPKey (Attribute _ _ k _) = k /= PKey

notKey :: Attribute -> Bool
notKey (Attribute _ t _ _) =
  case t of
    (KeyDom _) -> False
    _ -> True

-- An entity is relevant for a list of attributes if the first Key attribute
-- is a key to this entity.
isRelevantForEntity :: Entity -> [Attribute] -> Bool
isRelevantForEntity (Entity ename a) (attr:attrs) =
  case attr of
    (Attribute _ (KeyDom name) _ _) -> ename == name
    _ -> isRelevantForEntity (Entity ename a) attrs
isRelevantForEntity _ [] = False

oneToOne :: Entity -> [Relationship] -> [String]
oneToOne (Entity ename _) rel =
    map (relatedRelation ename) (filter isOneToOne rel)
  where
    isOneToOne :: Relationship -> Bool
    isOneToOne relationship =
      case relationship of
        (Relationship _ [(REnd _ _ (Exactly 1)), (REnd _ _ (Exactly 1))]) -> True
        _ -> False

manyToOne :: Entity -> [Relationship] -> [String]
manyToOne (Entity ename _) rel =
    map (relatedRelation ename) (filter isManyToOne rel)
  where
    isManyToOne :: Relationship -> Bool
    isManyToOne relationship =
      case relationship of
        (Relationship _ [REnd _ _ (Exactly 1),
                         REnd relEName _ (Between _ _)])
           -> relEName == ename
        _  -> False

manyToMany :: [Entity] -> Entity -> [String]
manyToMany entities forEntity =
    map (getOtherREnd forEntity)
        (filter (\ (Entity ename attr) -> isGenerated (Entity ename attr) &&
                                          isRelevantForEntity forEntity attr)
                entities)
  where
    getOtherREnd (Entity ename _)
                 (Entity _ [(Attribute _ (KeyDom name1) _ _),
                            (Attribute _ (KeyDom name2) _ _)]) =
      if (name1 == ename) then name2 else name1

linkTableName :: String -> String -> [Entity] -> String
linkTableName ename1 ename2 entities =
    getLinkTableName (filter isGenerated entities)
  where
    getLinkTableName ((Entity name [(Attribute _ (KeyDom rel1) _ _),
                                    (Attribute _ (KeyDom rel2) _ _)]):erest) =
      if (rel1==ename1 && rel2==ename2) || (rel1==ename2 && rel2==ename1)
      then name
      else getLinkTableName erest
    getLinkTableName [] = error "linkTableName: link not found"

--- The standard type of new and list controllers.
controllerType :: CTypeExpr
controllerType = baseType (spiceyModule,"Controller")

controllerModuleName :: String -> String
controllerModuleName entityName = "Controller." ++ entityName

--- The name of the controller function for a given entity and controller
--- functionality.
controllerFunctionName :: String -> String -> QName
controllerFunctionName entityName controllerFunction =
  (controllerModuleName entityName,
   controllerFunction ++ entityName ++ "Controller")

--- The name of the transaction function for a given entity and transaction
--- functionality.
transFunctionName :: String -> String -> QName
transFunctionName entityName controllerFunction =
  (controllerModuleName entityName,
   controllerFunction ++ entityName ++ "T")


viewModuleName :: String -> String
viewModuleName entityName = "View." ++ entityName

viewFunctionName :: String -> String -> QName
viewFunctionName entityName viewFunction =
  (viewModuleName entityName, viewFunction ++ entityName ++ "View")

viewBlockType :: CTypeExpr
viewBlockType = listType (baseType (html "HtmlExp"))


attrType :: Attribute -> CTypeExpr
attrType (Attribute _ t k False) =
  case t of (IntDom _)       -> if k==PKey
                                then ctvar "Key"
                                else ctvar "Int"
            (FloatDom _)     -> ctvar "Float"
            (StringDom _ )   -> ctvar "String"
            (BoolDom _)      -> ctvar "Bool"
            (DateDom _)      -> ctvar "CalendarTime"
            (UserDefined s _)-> ctvar s
            (KeyDom _)       -> ctvar "Key"
            _                -> ctvar "Int"
attrType (Attribute _ t k True) =
  case t of (IntDom _)       -> if k==PKey
                                then maybeType (ctvar "Key")
                                else maybeType (ctvar "Int")
            (FloatDom _)     -> maybeType (ctvar "Float")
            (StringDom _ )   -> ctvar "String"
            (BoolDom _)      -> maybeType (ctvar "Bool")
            (DateDom _)      -> maybeType (ctvar "CalendarTime")
            (UserDefined s _)-> maybeType (ctvar s)
            (KeyDom _)       -> maybeType (ctvar "Key")
            _                -> maybeType (ctvar "Int")

--- Generates Curry expressions representing default values.
--- The first argument contains an expression that is used for
--- ClockTime attributes (it is set to the current
--- time as a default value).
attrDefaultValues :: CExpr -> [Attribute] -> [CExpr]
attrDefaultValues defaultctime attrs = map defaultValue attrs
 where
  defaultValue (Attribute _ domain _ null) = case domain of
    IntDom    Nothing  -> nothingOrDefault
    IntDom    (Just n) -> addJust (CLit (CIntc n))
    FloatDom  Nothing  -> nothingOrDefault
    FloatDom  (Just x) -> addJust (CLit (CFloatc x))
    CharDom   Nothing  -> nothingOrDefault
    CharDom   (Just c) -> addJust (CLit (CCharc c))
    StringDom Nothing  -> string2ac "" -- null string values are empty strings
    StringDom (Just s) -> string2ac s
    BoolDom   Nothing  -> nothingOrDefault
    BoolDom   (Just b) -> addJust (constF (pre (if b then "True" else "False")))
    DateDom   Nothing  -> nothingOrDefault
    DateDom   (Just (CalendarTime y mo d h m s tz))
                       -> addJust (applyF ("Time", "CalendarTime")
                                     (map (CLit . CIntc) [y,mo,d,h,m,s,tz]))
    UserDefined _ _    -> nothingOrDefault
    KeyDom _           -> nothingOrDefault
    _ -> error "GenerationHelper.attrDefaultValues: unknown domain for attribute"
   where
     nothingOrDefault = if null
                        then constF (pre "Nothing")
                        else domainDefaultValue defaultctime domain

     -- add "Just" constructor if the attribute can be null-valued:
     addJust e = if null then applyF (pre "Just") [e] else e

--- Generates Curry expressions representing a default values
--- for a given domain.
--- The first argument contains an expression that is used for
--- ClockTime attributes (it is set to the current
--- time as a default value).
domainDefaultValue :: CExpr -> Domain -> CExpr
domainDefaultValue defaultctime domain = case domain of
    IntDom    _  -> CLit (CIntc 0)
    FloatDom  _  -> CLit (CFloatc 0)
    CharDom   _  -> CLit (CCharc ' ')
    StringDom _  -> string2ac []
    BoolDom   _  -> constF (pre "False")
    DateDom   _  -> defaultctime
    UserDefined _ _ -> list2ac [] -- no support of user-defined default values
    KeyDom _    -> CLit (CIntc 0)
    _ -> error "GenerationHelper.domainDefaultValue: unknown domain"

-- Is the attribute domain a string domain?
isStringDom :: Domain -> Bool
isStringDom dom = case dom of
                   StringDom _ -> True
                   _           -> False

hasCalendarTimeAttribute :: [Attribute] -> Bool
hasCalendarTimeAttribute = any isCalendarTime
 where
  isCalendarTime (Attribute _ domain _ _) = case domain of
    DateDom _   -> True
    _           -> False

combinator :: Int -> QName
combinator n =
  case n of
    0 -> error "GenerationHelper.combinator: empty attribute list"
    1 -> error "GenerationHelper.combinator: no combinator for list of length 1"
    2 -> (wui "wPair")
    3 -> (wui "wTriple")
    4 -> (wui "w4Tuple")
    5 -> (wui "w5Tuple")
    6 -> (wui "w6Tuple")
    7 -> (wui "w7Tuple")
    8 -> (wui "w8Tuple")
    9 -> (wui "w9Tuple")
    10 -> (wui "w10Tuple")
    11 -> (wui "w11Tuple")
    12 -> (wui "w12Tuple")
    _ -> error "GenerationHelper.combinator: attribute list too long"

-- Associate to each attribute of the argument list a WUI specification
-- as an abstract Curry program
attrWidgets :: [Attribute] -> [CExpr]
attrWidgets ((Attribute _ domain _ null):attrlist) =
  (widgetFor domain null) : (attrWidgets attrlist)
attrWidgets [] = []

widgetFor :: Domain -> Bool -> CExpr
widgetFor domain null =
  case domain of
    IntDom _    -> addMaybe (constF (wui "wInt"))
    FloatDom _  -> addMaybe (constF (wui "wFloat"))
    CharDom _   -> addMaybe (constF (wui "wString"))
    StringDom _ -> if null then constF (spiceyModule,"wString")
                           else constF (wui "wRequiredString")
                   --constF (wui (if null then "wString" else "wRequiredString"))
    BoolDom _   -> addMaybe (constF (wui "wBoolean"))
    DateDom _   -> addMaybe (constF (spiceyModule, "wDateType"))
    UserDefined _ _ -> addMaybe (applyF (wui "wCheckBool")
                                        [applyF (html "htxt") [string2ac ""]])
    KeyDom _    -> addMaybe (constF (wui "wInt"))
    _ -> error "widgetFor: unknown domain for attribute"
 where
  -- adds a Maybe WUI if null values are allowed
  addMaybe e =
    if null
     then applyF (spiceyModule,"wUncheckMaybe")
            [domainDefaultValue
               (applyF ("Time", "CalendarTime")
                       (map (CLit . CIntc) [2016,1,1,0,0,0,0]))
               domain, e]
     else e