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 # Compute importation of classes and inheritance of properties
21 intrude import static_type
24 # The root of the class hierarchy
27 var c_name
= class_by_name
(once
("Object".to_symbol
))
28 return c_name
.get_type
31 # Import global classes from supermodules
32 meth import_global_classes
34 var globals
= new HashMap[MMGlobalClass,HashSet[MMLocalClass]]
36 for mod
in mhe
.direct_greaters
do
37 for glob
in mod
.global_classes
do
38 if global_classes
.has
(glob
) then continue
39 _global_classes
.add
(glob
)
40 _global_class_by_name
[glob
.name
] = glob
46 # Create implicit local classes for global classes that are not refined
47 meth import_local_classes
49 for g
in _global_classes
do
50 if _local_class_by_global
.has_key
(g
) then continue
51 var impl
= new MMImplicitLocalClass(self, g
)
56 redef class MMLocalClass
58 attr _direct_parents
: Array[MMAncestor] = new Array[MMAncestor]
60 # Is the class computing super.
61 # Used to detect specialization loops.
62 attr _computing_super
: Bool = false
64 # Compute super classes of a class
65 meth compute_super_classes
67 if computed_super_classes
then
68 # do no recompute if allready done
70 else if _computing_super
then
71 stderr
.write
("Fatal error: Inheritance loop for class {self}\n")
74 _computing_super
= true
76 var supers
= new Array[MMLocalClass]
77 add_explicit_classes
(supers
)
78 add_super_classes
(supers
)
79 add_default_any_class
(supers
)
80 compute_super_parents
(supers
)
81 var set
= new HashSet[MMLocalClass]
84 module.set_supers_class
(self,u
)
87 _computing_super
= false
90 # Compute ancestors for a class
91 meth compute_ancestors
93 assert computed_super_classes
94 if computed_ancestors
then return
96 var ancestors
= group_ancestors
(build_ancestors
)
97 _ancestors
= new HashMap[MMLocalClass, MMAncestor]
99 for set
in ancestors
do
100 if set
.length
== 1 then
101 add_ancestor
(set
.first
)
103 var ma
= merge_ancestors
(set
)
104 add_ancestor
(merge_ancestors
(set
))
109 # Inherit global properties for a class
110 meth inherit_global_properties
112 if _global_properties
!= null then return
114 _global_properties
= new HashSet[MMGlobalProperty]
115 _properties_by_name
= new HashMap[Symbol, Array[MMGlobalProperty]]
116 _local_property_by_global
= new HashMap[MMGlobalProperty, MMLocalProperty]
118 var names
= _properties_by_name
119 var set
= _global_properties
120 for c
in che
.direct_greaters
do
121 for glob
in c
.global_properties
do
122 if set
.has
(glob
) then continue
124 set
.add
(glob
) # Add the global property
126 # Do not inherit constructors trough specialization
127 #print "{c.module}::{c} -> {module}::{self} for {glob.local_property.local_class.module}::{glob.local_property.local_class}::{glob.local_property} : {glob.is_init}"
128 if glob
.is_init
and glob
.intro
.local_class
.global
!= global
then
133 make_visible_an_inherited_global_property
(glob
)
138 # Make the name of a global property meaningful in the class
139 meth make_visible_an_inherited_global_property
(glob
: MMGlobalProperty)
141 var names
= _properties_by_name
142 var gname
= glob
.intro
.name
143 var conf_set
: Array[MMGlobalProperty]
144 if names
.has_key
(gname
) then
145 conf_set
= names
[gname
]
147 conf_set
= new Array[MMGlobalProperty]
148 names
[gname
] = conf_set
153 # Add super stype of this current local class
154 meth add_direct_parent
(p
: MMAncestor)
156 _direct_parents
.add
(p
)
159 # Are super-class already computed?
160 meth computed_super_classes
: Bool
162 return _crhe
!= null and _cshe
!= null
165 # Are ancestors already computed
166 meth computed_ancestors
: Bool
168 return _ancestors
!= null
171 # Get the ancestor for a given class
172 # TODO: is this useful?
173 private meth ancestor_for
(c
: MMLocalClass): MMAncestor
175 assert ancestors
!= null
177 if _ancestors
.has_key
(c
) then
180 var a
= c
.for_module
(module)
183 if _ancestors
.has_key
(a
) then
185 else if c
.global
== _global
then
186 ra
= new MMRefineAncestor(self,c
)
188 ra
= new MMSpecAncestor(get_type
,c
.get_type
)
196 if _local_property_by_global
.has_key
(glob
) then
197 return _local_property_by_global
[glob
]
198 else if has_global_property
(glob
) then
199 return inherit_local_property
(glob
)
205 # Add default super class in direct parent and in super classes if this is not the Object class
206 private meth add_default_any_class
(supers
: Array[MMLocalClass])
208 if supers
.is_empty
and name
!= once
("Object".to_symbol
) then
209 var t_any
= module.type_any
210 supers
.add
(t_any
.local_class
)
211 var default
= new MMDefaultAncestor(self, t_any
)
212 add_direct_parent
(default
)
216 # Adding inherited class from previous refinement of self
217 private meth add_super_classes
(supers
: Array[MMLocalClass])
220 for ref
in _crhe
.direct_greaters
do
221 assert ref
.cshe
!= null
222 for sup
in ref
.cshe
.direct_greaters
do
223 var cla
= sup
.for_module
(_module
)
230 # Add self parents of this local class
231 private meth add_explicit_classes
(supers
: Array[MMLocalClass])
233 for p
in _direct_parents
do
234 supers
.add
(p
.local_class
)
238 # Ensure all super parents are computed
239 private meth compute_super_parents
(supers
: Array[MMLocalClass])
243 p
.compute_super_classes
247 # compute all ancestors for a class (multiple)
248 private meth build_ancestors
: Array[MMAncestor]
250 var all_ancestors
= new Array[MMAncestor]
251 # Refined classes are ancestors
253 for p
in _crhe
.direct_greaters
do
255 var anc
= new MMRefineAncestor(self, p
)
256 anc
.add_in
(all_ancestors
)
258 for anc
in _direct_parents
do
259 assert anc
.local_class
!= self
260 anc
.add_in
(all_ancestors
)
265 # Build an ancestor map indexed by LocalClass
266 private meth group_ancestors
(all
: Array[MMAncestor]): Map[MMLocalClass, Set[MMAncestor]]
268 #print "process {self}"
269 var map
= new HashMap[MMLocalClass, Set[MMAncestor]]
271 var c
= a
.local_class
274 var set
: Set[MMAncestor]
276 if map
.has_key
(c
) then
279 set
= new HashSet[MMAncestor]
287 # Remove duplicate ancestors and merge if compatible, in the other case do an error
288 private meth merge_ancestors
(set
: Set[MMAncestor]): MMAncestor
290 var marks
= new HashSet[MMAncestor]
291 var res
= new Array[MMAncestor]
293 var it
= set
.iterator
295 while it
.is_ok
and search
do
298 a
= marks
.has
(it
.item
)
299 a
= it
.item
.stype
< t
.stype
301 if not(t
== it
.item
or marks
.has
(it
.item
)) and
302 (it
.item
.stype
< t
.stype
) then
308 if not marks
.has
(t
) then
313 if res
.length
> 1 then
314 stderr
.write
("Fatal error: Incompatibles ancestors for {self.name}: {res.join(", ")}\n")
320 # Inherit a local property
322 # FIXME: dont crash lazily
323 private meth inherit_local_property
(glob
: MMGlobalProperty): MMLocalProperty
325 assert not _local_property_by_global
.has_key
(glob
)
328 var impl
: MMLocalProperty
330 var ghier
= glob
.property_hierarchy
331 var supers
= che
.direct_greaters
332 if ghier
.length
== 1 then
333 # Unredefined property
335 else if supers
.length
== 1 then
337 impl
= supers
.first
[glob
]
339 # Hard multiple inheritance
340 # First compute the set of bottom properties
341 var impls
= new ArraySet[MMLocalProperty]
343 if sc
.has_global_property
(glob
) then impls
.add
(sc
[glob
])
345 # Second, extract most specific
346 var impls2
= ghier
.select_smallests
(impls
)
347 # Conflict case (FIXME)
348 if impls2
.length
!= 1 then
349 stderr
.write
("Fatal error: inherit_local_property error\n")
350 print
("------- {module}::{self} {glob.intro.full_name}")
352 print
(" {i.full_name}")
354 print
("------- {glob.property_hierarchy.first}")
355 print
("------- {glob.property_hierarchy.to_dot}")
361 # FIXME: Why these 3 lines ?
362 #var ac = ancestor_for(impl.local_class)
363 #ac.local_class.inherit_global_properties
365 #assert a.local_class != self
367 # Register the local property
368 _local_property_by_global
[glob
] = impl
374 redef class MMLocalProperty
375 # Attach self to a global property
376 meth inherit_global
(g
: MMGlobalProperty)
379 var impls
= new Array[MMLocalProperty]
380 for sc
in local_class
.che
.direct_greaters
do
381 if not sc
.has_global_property
(g
) then continue
384 g
.add_local_property
(self, impls
)
388 redef class MMAncestor
389 # Add this ancestor and it's super one in tab
390 private meth add_in
(tab
: Array[MMAncestor])
392 assert ancestor
: stype
!= null
393 assert local_class
: stype
.local_class
!= null
395 stype
.local_class
.compute_ancestors
396 for anc
in stype
.local_class
.ancestors
do
397 var aaa
= anc
.stype
.for_module
(stype
.module)
398 var a
= aaa
.adapt_to
(stype
).for_module
(inheriter
.module)
399 if a
.local_class
!= inheriter
.local_class
then
400 var it
= tab
.iterator
402 while it
.is_ok
and b
do
403 b
= not ( it
.item
.inheriter
== inheriter
and it
.item
.stype
== a
)
407 tab
.add
(new MMSpecAncestor(inheriter
,a
))
414 ##########################################
416 # A local class that is a pure importation of an other local class
417 class MMImplicitLocalClass
419 init(mod
: MMModule, g
: MMGlobalClass)
422 super(mod
, cla
.name
, cla
.arity
)
427 class MMRefineAncestor
429 redef readable attr _local_class
: MMLocalClass
431 init(b
: MMLocalClass, a
: MMLocalClass)
434 inheriter
= b
.get_type
435 stype
= _local_class
.get_type
442 redef meth local_class
do return stype
.local_class
444 init(inheriter
: MMType, stype
: MMType)
446 _inheriter
= inheriter
451 class MMDefaultAncestor
453 redef meth local_class
do return stype
.local_class
455 init(b
: MMLocalClass, anc
: MMType)
458 assert b
.module != null
460 inheriter
= b
.get_type