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 attr _are_global_properties_inherited
: Bool = false
111 # Inherit global properties for a class
112 meth inherit_global_properties
114 if _are_global_properties_inherited
then return
115 _are_global_properties_inherited
= true
117 var names
= _properties_by_name
118 var set
= _global_properties
119 for c
in che
.direct_greaters
do
120 for glob
in c
.global_properties
do
121 if set
.has
(glob
) then continue
123 set
.add
(glob
) # Add the global property
125 # Do not inherit constructors trough specialization
126 #print "{c.module}::{c} -> {module}::{self} for {glob.local_property.local_class.module}::{glob.local_property.local_class}::{glob.local_property} : {glob.is_init}"
127 if glob
.is_init
and glob
.intro
.local_class
.global
!= global
then
132 make_visible_an_inherited_global_property
(glob
)
137 # Make the name of a global property meaningful in the class
138 meth make_visible_an_inherited_global_property
(glob
: MMGlobalProperty)
140 var names
= _properties_by_name
141 var gname
= glob
.intro
.name
142 var conf_set
: Array[MMGlobalProperty]
143 if names
.has_key
(gname
) then
144 conf_set
= names
[gname
]
146 conf_set
= new Array[MMGlobalProperty]
147 names
[gname
] = conf_set
152 # Add super stype of this current local class
153 meth add_direct_parent
(p
: MMAncestor)
155 _direct_parents
.add
(p
)
158 # Are super-class already computed?
159 meth computed_super_classes
: Bool
161 return _crhe
!= null and _cshe
!= null
164 # Are ancestors already computed
165 meth computed_ancestors
: Bool
167 return _ancestors
!= null
170 # Get the ancestor for a given class
171 # TODO: is this useful?
172 private meth ancestor_for
(c
: MMLocalClass): MMAncestor
174 assert ancestors
!= null
176 if _ancestors
.has_key
(c
) then
179 var a
= c
.for_module
(module)
182 if _ancestors
.has_key
(a
) then
184 else if c
.global
== _global
then
185 ra
= new MMRefineAncestor(self,c
)
187 ra
= new MMSpecAncestor(get_type
,c
.get_type
)
195 if _local_property_by_global
.has_key
(glob
) then
196 return _local_property_by_global
[glob
]
197 else if has_global_property
(glob
) then
198 return inherit_local_property
(glob
)
204 # Add default super class in direct parent and in super classes if this is not the Object class
205 private meth add_default_any_class
(supers
: Array[MMLocalClass])
207 if supers
.is_empty
and name
!= once
("Object".to_symbol
) then
208 var t_any
= module.type_any
209 supers
.add
(t_any
.local_class
)
210 var default
= new MMDefaultAncestor(self, t_any
)
211 add_direct_parent
(default
)
215 # Adding inherited class from previous refinement of self
216 private meth add_super_classes
(supers
: Array[MMLocalClass])
219 for ref
in _crhe
.direct_greaters
do
220 for sup
in ref
.cshe
.direct_greaters
do
221 var cla
= sup
.for_module
(_module
)
227 # Add self parents of this local class
228 private meth add_explicit_classes
(supers
: Array[MMLocalClass])
230 for p
in _direct_parents
do
231 supers
.add
(p
.local_class
)
235 # Ensure all super parents are computed
236 private meth compute_super_parents
(supers
: Array[MMLocalClass])
239 p
.compute_super_classes
243 # compute all ancestors for a class (multiple)
244 private meth build_ancestors
: Array[MMAncestor]
246 var all_ancestors
= new Array[MMAncestor]
247 # Refined classes are ancestors
249 for p
in _crhe
.direct_greaters
do
251 var anc
= new MMRefineAncestor(self, p
)
252 anc
.add_in
(all_ancestors
)
254 for anc
in _direct_parents
do
255 assert anc
.local_class
!= self
256 anc
.add_in
(all_ancestors
)
261 # Build an ancestor map indexed by LocalClass
262 private meth group_ancestors
(all
: Array[MMAncestor]): Map[MMLocalClass, Set[MMAncestor]]
264 #print "process {self}"
265 var map
= new HashMap[MMLocalClass, Set[MMAncestor]]
267 var c
= a
.local_class
270 var set
: Set[MMAncestor]
272 if map
.has_key
(c
) then
275 set
= new HashSet[MMAncestor]
283 # Remove duplicate ancestors and merge if compatible, in the other case do an error
284 private meth merge_ancestors
(set
: Set[MMAncestor]): MMAncestor
286 var marks
= new HashSet[MMAncestor]
287 var res
= new Array[MMAncestor]
289 var it
= set
.iterator
291 while it
.is_ok
and search
do
294 a
= marks
.has
(it
.item
)
295 a
= it
.item
.stype
< t
.stype
297 if not(t
== it
.item
or marks
.has
(it
.item
)) and
298 (it
.item
.stype
< t
.stype
) then
304 if not marks
.has
(t
) then
309 if res
.length
> 1 then
310 stderr
.write
("Fatal error: Incompatibles ancestors for {self.name}: {res.join(", ")}\n")
316 # Inherit a local property
318 # FIXME: dont crash lazily
319 private meth inherit_local_property
(glob
: MMGlobalProperty): MMLocalProperty
321 assert not _local_property_by_global
.has_key
(glob
)
323 var impl
: MMLocalProperty
325 var ghier
= glob
.property_hierarchy
326 var supers
= che
.direct_greaters
327 if ghier
.length
== 1 then
328 # Unredefined property
330 else if supers
.length
== 1 then
332 impl
= supers
.first
[glob
]
334 # Hard multiple inheritance
335 # First compute the set of bottom properties
336 var impls
= new ArraySet[MMLocalProperty]
338 if sc
.has_global_property
(glob
) then impls
.add
(sc
[glob
])
340 # Second, extract most specific
341 var impls2
= ghier
.select_smallests
(impls
)
342 # Conflict case (FIXME)
343 if impls2
.length
!= 1 then
344 stderr
.write
("Fatal error: inherit_local_property error\n")
345 print
("------- {module}::{self} {glob.intro.full_name}")
347 print
(" {i.full_name}")
349 print
("------- {glob.property_hierarchy.first}")
350 print
("------- {glob.property_hierarchy.to_dot}")
356 # FIXME: Why these 3 lines ?
357 #var ac = ancestor_for(impl.local_class)
358 #ac.local_class.inherit_global_properties
360 #assert a.local_class != self
362 # Register the local property
363 _local_property_by_global
[glob
] = impl
369 redef class MMLocalProperty
370 # Attach self to a global property
371 meth inherit_global
(g
: MMGlobalProperty)
374 var impls
= new Array[MMLocalProperty]
375 for sc
in local_class
.che
.direct_greaters
do
376 if not sc
.has_global_property
(g
) then continue
379 g
.add_local_property
(self, impls
)
383 redef class MMAncestor
384 # Add this ancestor and it's super one in tab
385 private meth add_in
(tab
: Array[MMAncestor])
388 stype
.local_class
.compute_ancestors
389 for anc
in stype
.local_class
.ancestors
.as(not null) do
390 var aaa
= anc
.stype
.for_module
(stype
.module)
391 var a
= aaa
.adapt_to
(stype
).for_module
(inheriter
.module)
392 if a
.local_class
!= inheriter
.local_class
then
393 var it
= tab
.iterator
395 while it
.is_ok
and b
do
396 b
= not ( it
.item
.inheriter
== inheriter
and it
.item
.stype
== a
)
400 tab
.add
(new MMSpecAncestor(inheriter
,a
))
407 ##########################################
409 # A local class that is a pure importation of an other local class
410 class MMImplicitLocalClass
412 init(mod
: MMModule, g
: MMGlobalClass)
415 super(mod
, cla
.name
, cla
.arity
)
420 class MMRefineAncestor
422 redef readable attr _local_class
: MMLocalClass
424 init(b
: MMLocalClass, a
: MMLocalClass)
427 inheriter
= b
.get_type
428 stype
= _local_class
.get_type
435 redef meth local_class
do return stype
.local_class
437 init(inheriter
: MMType, stype
: MMType)
439 _inheriter
= inheriter
444 class MMDefaultAncestor
446 redef meth local_class
do return stype
.local_class
448 init(b
: MMLocalClass, anc
: MMType)
450 inheriter
= b
.get_type