1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2004-2008 Jean Privat <jean@pryen.org>
4 # Copyright 2006-2008 Floréal Morandat <morandat@lirmm.fr>
6 # Licensed under the Apache License, Version 2.0 (the "License");
7 # you may not use this file except in compliance with the License.
8 # You may obtain a copy of the License at
10 # http://www.apache.org/licenses/LICENSE-2.0
12 # Unless required by applicable law or agreed to in writing, software
13 # distributed under the License is distributed on an "AS IS" BASIS,
14 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 # See the License for the specific language governing permissions and
16 # limitations under the License.
18 # Static types and property signatures
21 intrude import abstractmetamodel
23 redef class MMLocalClass
24 # Cached result of get_type
25 attr _base_type_cache
: MMType
27 # Return the type of self for this class
30 if _base_type_cache
== null then _base_type_cache
= new MMTypeSimpleClass(self)
31 return _base_type_cache
34 # Register a new ancestor
35 protected meth add_ancestor
(a
: MMAncestor)
37 assert not _ancestors
.has_key
(a
.local_class
)
38 assert a
.local_class
!= self
39 _ancestors
[a
.local_class
] = a
42 # Array of ancestor that associate each superclass with the corresponding ancestor
43 readable attr _ancestors
: Map[MMLocalClass, MMAncestor]
45 # The ancestor type for a given superclass
46 meth ancestor
(c
: MMLocalClass): MMType
48 assert _ancestors
!= null
49 if _ancestors
.has_key
(c
) then
50 return _ancestors
[c
].stype
56 redef class MMLocalProperty
57 # The signature of the property (where it is declared)
58 readable writable attr _signature
: MMSignature
60 attr _signatures_cache
: HashMap[MMType, MMSignature] = new HashMap[MMType, MMSignature]
62 # Return the adapted signature of self for a receiver of type t
63 meth signature_for
(t
: MMType): MMSignature do
64 if t
== local_class
.get_type
then return signature
66 if _signatures_cache
.has_key
(t
) then return _signatures_cache
[t
]
68 var res
= signature
.adaptation_to
(t
)
69 _signatures_cache
[t
] = res
74 # Signature for local properties
76 # The type of the reveiver
77 readable attr _recv
: MMType
80 attr _params
: Array[MMType]
83 readable attr _return_type
: MMType
85 # Number of parameters
88 assert _params
!= null
92 # Is self a valid subtype of an other signature
93 meth
<(s
: MMSignature): Bool
99 assert _recv
.module == s
.recv
.module
100 if arity
!= s
.arity
or (_return_type
== null) != (s
.return_type
== null) then return false
101 if _return_type
!= null and not _return_type
< s
.return_type
then
105 for i
in [0..arity
[ do
106 if not s
[i
] < self[i
] then
113 # The type of the i-th parameter
114 meth
[](i
: Int): MMType
116 assert _params
.length
> i
123 if _params
!= null and _params
.length
> 0 then
125 var a
= new Array[String].with_capacity
(_params
.length
)
126 for i
in [0.._params
.length
[ do
127 #var pn = _params_name[i]
132 s
= "({a.join(",")})"
136 if _return_type
!= null then
137 s
.append
(": {_return_type}")
142 # Adapt the signature to a different receiver
143 meth adaptation_to
(r
: MMType): MMSignature
151 p
= new Array[MMType]
153 p
.add
(i
.for_module
(mod
).adapt_to
(r
))
156 var rv
= _return_type
158 rv
= rv
.for_module
(mod
).adapt_to
(r
)
160 return new MMSignature(p
,rv
,r
)
163 attr _not_for_self_cache
: MMSignature
165 # Return a type approximation if the reveiver is not self
166 # Useful for virtual types
167 meth not_for_self
: MMSignature
169 var res
= _not_for_self_cache
170 if res
!= null then return res
172 var need_for_self
= false
175 p
= new Array[MMType]
177 var i2
= i
.not_for_self
178 if i
!= i2
then need_for_self
= true
179 p
.add
(i
.not_for_self
)
183 var rv
= _return_type
185 var rv
= rv
.not_for_self
186 if rv
!= _return_type
then need_for_self
= true
189 if need_for_self
then
190 res
= new MMSignature(p
, rv
, _recv
)
195 _not_for_self_cache
= res
199 init(params
: Array[MMType], return_type
: MMType, r
: MMType)
201 assert params
!= null
203 _return_type
= return_type
208 # Inheritance relation between two types
209 abstract class MMAncestor
211 readable writable attr _stype
: MMType
213 # The inheriter (heir) type
214 readable writable attr _inheriter
: MMType
216 meth is_reffinement
: Bool do
217 return stype
.module != stype
.module
220 meth is_specialisation
: Bool do
221 return stype
.local_class
.global
!= inheriter
.local_class
.global
224 # The inherited class
225 meth local_class
: MMLocalClass is abstract
229 if stype
== null then
230 return local_class
.to_s
238 # Note that static type a related to a specific module
239 abstract class MMType
240 # The module where self makes sence
241 meth
module: MMModule is abstract
243 # The local class that self direclty or indirectly refers to
244 meth local_class
: MMLocalClass is abstract
246 # Is self a valid subtype of t
247 meth
<(t
: MMType): Bool is abstract
249 # Is self a valid supertype of t
250 # This method must be only called within definition of < if
251 # a double dispatch is needed
252 meth is_supertype
(t
: MMType): Bool is abstract
254 # Adapt self to another module
255 meth for_module
(mod
: MMModule): MMType is abstract
257 # Get the type adapted to another receiver type
258 # Useful for formal types
259 meth adapt_to
(recv
: MMType): MMType is abstract
261 # Adapt self to another local class context
262 # Useful for genericity
263 meth upcast_for
(c
: MMLocalClass): MMType is abstract
265 # Return a type approximation if the reveiver is not self
266 # Useful for virtual types
267 meth not_for_self
: MMType do return self
272 redef readable attr _local_class
: MMLocalClass
273 redef meth
module do return _local_class
.module end
274 redef meth
<(t
) do return t
!= null and t
.is_supertype
(self)
278 return _local_class
.to_s
281 redef meth upcast_for
(c
)
283 assert _local_class
!= null
287 if _local_class
!= c
then
288 t
= _local_class
.ancestor
(c
)
294 init(c
: MMLocalClass)
300 class MMTypeSimpleClass
302 redef meth is_supertype
(t
)
304 return t
.local_class
.cshe
<= _local_class
307 redef meth for_module
(mod
)
310 if module != mod
then
311 t
= _local_class
.for_module
(mod
).get_type
317 redef meth adapt_to
(recv
) do return self
319 init(c
: MMLocalClass)
328 redef readable attr _module
: MMModule
329 redef meth
<(t
) do return true
330 redef meth is_supertype
(t
) do return false
331 redef meth local_class
do abort
332 redef meth upcast_for
(c
) do return self
334 private init(m
: MMModule) do _module
= m
339 readable attr _type_none
: MMTypeNone = new MMTypeNone(self)