1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Classes, types and properties
19 # All three concepts are defined in this same module because these are strongly connected:
20 # * types are based on classes
21 # * classes contains properties
22 # * some properties are types (virtual types)
24 # TODO: liearization, extern stuff
25 # FIXME: better handling of the types
31 private import more_collections
34 # The visibility of the MEntity.
36 # MPackages, MGroups and MModules are always public.
37 # The visibility of `MClass` and `MProperty` is defined by the keyword used.
38 # `MClassDef` and `MPropDef` return the visibility of `MClass` and `MProperty`.
39 fun visibility
: MVisibility do return public_visibility
44 var mclasses
= new Array[MClass]
46 # All known properties
47 var mproperties
= new Array[MProperty]
49 # Hierarchy of class definition.
51 # Each classdef is associated with its super-classdefs in regard to
52 # its module of definition.
55 # var m = new ModelDiamond
56 # assert m.mclassdef_hierarchy.has_edge(m.mclassdef_b, m.mclassdef_a)
57 # assert not m.mclassdef_hierarchy.has_edge(m.mclassdef_a, m.mclassdef_b)
58 # assert not m.mclassdef_hierarchy.has_edge(m.mclassdef_b, m.mclassdef_c)
60 var mclassdef_hierarchy
= new POSet[MClassDef]
62 # Class-type hierarchy restricted to the introduction.
64 # The idea is that what is true on introduction is always true whatever
65 # the module considered.
66 # Therefore, this hierarchy is used for a fast positive subtype check.
68 # This poset will evolve in a monotonous way:
69 # * Two non connected nodes will remain unconnected
70 # * New nodes can appear with new edges
71 private var intro_mtype_specialization_hierarchy
= new POSet[MClassType]
73 # Global overlapped class-type hierarchy.
74 # The hierarchy when all modules are combined.
75 # Therefore, this hierarchy is used for a fast negative subtype check.
77 # This poset will evolve in an anarchic way. Loops can even be created.
79 # FIXME decide what to do on loops
80 private var full_mtype_specialization_hierarchy
= new POSet[MClassType]
82 # Collections of classes grouped by their short name
83 private var mclasses_by_name
= new MultiHashMap[String, MClass]
85 # Return all classes named `name`.
87 # If such a class does not exist, null is returned
88 # (instead of an empty array)
90 # Visibility or modules are not considered
93 # var m = new ModelStandalone
94 # assert m.get_mclasses_by_name("Object") == [m.mclass_o]
95 # assert m.get_mclasses_by_name("Fail") == null
97 fun get_mclasses_by_name
(name
: String): nullable Array[MClass]
99 return mclasses_by_name
.get_or_null
(name
)
102 # Collections of properties grouped by their short name
103 private var mproperties_by_name
= new MultiHashMap[String, MProperty]
105 # Return all properties named `name`.
107 # If such a property does not exist, null is returned
108 # (instead of an empty array)
110 # Visibility or modules are not considered
111 fun get_mproperties_by_name
(name
: String): nullable Array[MProperty]
113 return mproperties_by_name
.get_or_null
(name
)
117 var null_type
= new MNullType(self)
119 # The only bottom type
120 var bottom_type
: MBottomType = null_type
.as_notnull
122 # Build an ordered tree with from `concerns`
123 fun concerns_tree
(mconcerns
: Collection[MConcern]): ConcernsTree do
124 var seen
= new HashSet[MConcern]
125 var res
= new ConcernsTree
127 var todo
= new Array[MConcern]
128 todo
.add_all mconcerns
130 while not todo
.is_empty
do
132 if seen
.has
(c
) then continue
133 var pc
= c
.parent_concern
147 # An OrderedTree bound to MEntity.
149 # We introduce a new class so it can be easily refined by tools working
152 super OrderedTree[MEntity]
155 # A MEntityTree borned to MConcern.
157 # TODO remove when nitdoc is fully merged with model_collect
159 super OrderedTree[MConcern]
163 redef var is_test
is lazy
do
164 var parent
= self.parent
165 if parent
!= null and parent
.is_test
then return true
166 return name
== "tests"
171 # All the classes introduced in the module
172 var intro_mclasses
= new Array[MClass]
174 # All the class definitions of the module
175 # (introduction and refinement)
176 var mclassdefs
= new Array[MClassDef]
178 private var mclassdef_sorter
: MClassDefSorter is lazy
do
179 return new MClassDefSorter(self)
182 private var mpropdef_sorter
: MPropDefSorter is lazy
do
183 return new MPropDefSorter(self)
186 # Does the current module has a given class `mclass`?
187 # Return true if the mmodule introduces, refines or imports a class.
188 # Visibility is not considered.
189 fun has_mclass
(mclass
: MClass): Bool
191 return self.in_importation
<= mclass
.intro_mmodule
194 # Full hierarchy of introduced and imported classes.
196 # Create a new hierarchy got by flattening the classes for the module
197 # and its imported modules.
198 # Visibility is not considered.
200 # Note: this function is expensive and is usually used for the main
201 # module of a program only. Do not use it to do your own subtype
203 fun flatten_mclass_hierarchy
: POSet[MClass]
205 var res
= self.flatten_mclass_hierarchy_cache
206 if res
!= null then return res
207 res
= new POSet[MClass]
208 for m
in self.in_importation
.greaters
do
209 for cd
in m
.mclassdefs
do
212 for s
in cd
.supertypes
do
213 res
.add_edge
(c
, s
.mclass
)
217 self.flatten_mclass_hierarchy_cache
= res
221 # Sort a given array of classes using the linearization order of the module
222 # The most general is first, the most specific is last
223 fun linearize_mclasses
(mclasses
: Array[MClass])
225 self.flatten_mclass_hierarchy
.sort
(mclasses
)
228 # Sort a given array of class definitions using the linearization order of the module
229 # the refinement link is stronger than the specialisation link
230 # The most general is first, the most specific is last
231 fun linearize_mclassdefs
(mclassdefs
: Array[MClassDef])
233 mclassdef_sorter
.sort
(mclassdefs
)
236 # Sort a given array of property definitions using the linearization order of the module
237 # the refinement link is stronger than the specialisation link
238 # The most general is first, the most specific is last
239 fun linearize_mpropdefs
(mpropdefs
: Array[MPropDef])
241 mpropdef_sorter
.sort
(mpropdefs
)
244 private var flatten_mclass_hierarchy_cache
: nullable POSet[MClass] = null
246 # The primitive type `Object`, the root of the class hierarchy
247 var object_type
: MClassType = self.get_primitive_class
("Object").mclass_type
is lazy
249 # The type `Pointer`, super class to all extern classes
250 var pointer_type
: MClassType = self.get_primitive_class
("Pointer").mclass_type
is lazy
252 # The primitive type `Bool`
253 var bool_type
: MClassType = self.get_primitive_class
("Bool").mclass_type
is lazy
255 # The primitive type `Int`
256 var int_type
: MClassType = self.get_primitive_class
("Int").mclass_type
is lazy
258 # The primitive type `Byte`
259 var byte_type
: MClassType = self.get_primitive_class
("Byte").mclass_type
is lazy
261 # The primitive type `Int8`
262 var int8_type
: MClassType = self.get_primitive_class
("Int8").mclass_type
is lazy
264 # The primitive type `Int16`
265 var int16_type
: MClassType = self.get_primitive_class
("Int16").mclass_type
is lazy
267 # The primitive type `UInt16`
268 var uint16_type
: MClassType = self.get_primitive_class
("UInt16").mclass_type
is lazy
270 # The primitive type `Int32`
271 var int32_type
: MClassType = self.get_primitive_class
("Int32").mclass_type
is lazy
273 # The primitive type `UInt32`
274 var uint32_type
: MClassType = self.get_primitive_class
("UInt32").mclass_type
is lazy
276 # The primitive type `Char`
277 var char_type
: MClassType = self.get_primitive_class
("Char").mclass_type
is lazy
279 # The primitive type `Float`
280 var float_type
: MClassType = self.get_primitive_class
("Float").mclass_type
is lazy
282 # The primitive type `String`
283 var string_type
: MClassType = self.get_primitive_class
("String").mclass_type
is lazy
285 # The primitive type `CString`
286 var c_string_type
: MClassType = self.get_primitive_class
("CString").mclass_type
is lazy
288 # A primitive type of `Array`
289 fun array_type
(elt_type
: MType): MClassType do return array_class
.get_mtype
([elt_type
])
291 # The primitive class `Array`
292 var array_class
: MClass = self.get_primitive_class
("Array") is lazy
294 # A primitive type of `NativeArray`
295 fun native_array_type
(elt_type
: MType): MClassType do return native_array_class
.get_mtype
([elt_type
])
297 # The primitive class `NativeArray`
298 var native_array_class
: MClass = self.get_primitive_class
("NativeArray") is lazy
300 # The primitive type `Sys`, the main type of the program, if any
301 fun sys_type
: nullable MClassType
303 var clas
= self.model
.get_mclasses_by_name
("Sys")
304 if clas
== null then return null
305 return get_primitive_class
("Sys").mclass_type
308 # The primitive type `Finalizable`
309 # Used to tag classes that need to be finalized.
310 fun finalizable_type
: nullable MClassType
312 var clas
= self.model
.get_mclasses_by_name
("Finalizable")
313 if clas
== null then return null
314 return get_primitive_class
("Finalizable").mclass_type
317 # Force to get the primitive class named `name` or abort
318 fun get_primitive_class
(name
: String): MClass
320 var cla
= self.model
.get_mclasses_by_name
(name
)
321 # Filter classes by introducing module
322 if cla
!= null then cla
= [for c
in cla
do if self.in_importation
<= c
.intro_mmodule
then c
]
323 if cla
== null or cla
.is_empty
then
324 if name
== "Bool" and self.model
.get_mclasses_by_name
("Object") != null then
325 # Bool is injected because it is needed by engine to code the result
326 # of the implicit casts.
327 var loc
= model
.no_location
328 var c
= new MClass(self, name
, loc
, null, enum_kind
, public_visibility
)
329 var cladef
= new MClassDef(self, c
.mclass_type
, loc
)
330 cladef
.set_supertypes
([object_type
])
331 cladef
.add_in_hierarchy
334 print_error
("Fatal Error: no primitive class {name} in {self}")
338 if cla
.length
!= 1 then
339 var msg
= "Fatal Error: more than one primitive class {name} in {self}:"
340 for c
in cla
do msg
+= " {c.full_name}"
347 # Try to get the primitive method named `name` on the type `recv`
348 fun try_get_primitive_method
(name
: String, recv
: MClass): nullable MMethod
350 var props
= self.model
.get_mproperties_by_name
(name
)
351 if props
== null then return null
352 var res
: nullable MMethod = null
353 var recvtype
= recv
.intro
.bound_mtype
354 for mprop
in props
do
355 assert mprop
isa MMethod
356 if not recvtype
.has_mproperty
(self, mprop
) then continue
359 else if res
!= mprop
then
360 print_error
("Fatal Error: ambigous property name '{name}'; conflict between {mprop.full_name} and {res.full_name}")
368 private class MClassDefSorter
370 redef type COMPARED: MClassDef
372 redef fun compare
(a
, b
)
376 if ca
!= cb
then return mmodule
.flatten_mclass_hierarchy
.compare
(ca
, cb
)
377 return mmodule
.model
.mclassdef_hierarchy
.compare
(a
, b
)
381 private class MPropDefSorter
383 redef type COMPARED: MPropDef
386 redef fun compare
(pa
, pb
)
390 return mmodule
.mclassdef_sorter
.compare
(a
, b
)
396 # `MClass`es are global to the model; it means that a `MClass` is not bound
397 # to a specific `MModule`.
399 # This characteristic helps the reasoning about classes in a program since a
400 # single `MClass` object always denote the same class.
402 # The drawback is that classes (`MClass`) contain almost nothing by themselves.
403 # These do not really have properties nor belong to a hierarchy since the property and the
404 # hierarchy of a class depends of the refinement in the modules.
406 # Most services on classes require the precision of a module, and no one can asks what are
407 # the super-classes of a class nor what are properties of a class without precising what is
408 # the module considered.
410 # For instance, during the typing of a source-file, the module considered is the module of the file.
411 # eg. the question *is the method `foo` exists in the class `Bar`?* must be reformulated into
412 # *is the method `foo` exists in the class `Bar` in the current module?*
414 # During some global analysis, the module considered may be the main module of the program.
418 # The module that introduce the class
420 # While classes are not bound to a specific module,
421 # the introducing module is used for naming and visibility.
422 var intro_mmodule
: MModule
424 # The short name of the class
425 # In Nit, the name of a class cannot evolve in refinements
430 # The canonical name of the class
432 # It is the name of the class prefixed by the full_name of the `intro_mmodule`
433 # Example: `"owner::module::MyClass"`
434 redef var full_name
is lazy
do
435 return "{self.intro_mmodule.namespace_for(visibility)}::{name}"
438 redef var c_name
is lazy
do
439 return "{intro_mmodule.c_namespace_for(visibility)}__{name.to_cmangle}"
442 # The number of generic formal parameters
443 # 0 if the class is not generic
444 var arity
: Int is noinit
446 # Each generic formal parameters in order.
447 # is empty if the class is not generic
448 var mparameters
= new Array[MParameterType]
450 # A string version of the signature a generic class.
452 # eg. `Map[K: nullable Object, V: nullable Object]`
454 # If the class in non generic the name is just given.
457 fun signature_to_s
: String
459 if arity
== 0 then return name
460 var res
= new FlatBuffer
463 for i
in [0..arity
[ do
464 if i
> 0 then res
.append
", "
465 res
.append mparameters
[i
].name
467 res
.append intro
.bound_mtype
.arguments
[i
].to_s
473 # Initialize `mparameters` from their names.
474 protected fun setup_parameter_names
(parameter_names
: nullable Array[String]) is
477 if parameter_names
== null then
480 self.arity
= parameter_names
.length
483 # Create the formal parameter types
485 assert parameter_names
!= null
486 var mparametertypes
= new Array[MParameterType]
487 for i
in [0..arity
[ do
488 var mparametertype
= new MParameterType(self, i
, parameter_names
[i
])
489 mparametertypes
.add
(mparametertype
)
491 self.mparameters
= mparametertypes
492 var mclass_type
= new MGenericType(self, mparametertypes
)
493 self.mclass_type
= mclass_type
494 self.get_mtype_cache
[mparametertypes
] = mclass_type
496 self.mclass_type
= new MClassType(self)
500 # The kind of the class (interface, abstract class, etc.)
502 # In Nit, the kind of a class cannot evolve in refinements.
505 # The visibility of the class
507 # In Nit, the visibility of a class cannot evolve in refinements.
512 intro_mmodule
.intro_mclasses
.add
(self)
513 var model
= intro_mmodule
.model
514 model
.mclasses_by_name
.add_one
(name
, self)
515 model
.mclasses
.add
(self)
518 redef fun model
do return intro_mmodule
.model
520 # All class definitions (introduction and refinements)
521 var mclassdefs
= new Array[MClassDef]
524 redef fun to_s
do return self.name
526 # The definition that introduces the class.
528 # Warning: such a definition may not exist in the early life of the object.
529 # In this case, the method will abort.
531 # Use `try_intro` instead.
532 var intro
: MClassDef is noinit
534 # The definition that introduces the class or `null` if not yet known.
537 fun try_intro
: nullable MClassDef do
538 if isset _intro
then return _intro
else return null
541 # Return the class `self` in the class hierarchy of the module `mmodule`.
543 # SEE: `MModule::flatten_mclass_hierarchy`
544 # REQUIRE: `mmodule.has_mclass(self)`
545 fun in_hierarchy
(mmodule
: MModule): POSetElement[MClass]
547 return mmodule
.flatten_mclass_hierarchy
[self]
550 # The principal static type of the class.
552 # For non-generic class, `mclass_type` is the only `MClassType` based
555 # For a generic class, the arguments are the formal parameters.
556 # i.e.: for the class `Array[E:Object]`, the `mclass_type` is `Array[E]`.
557 # If you want `Array[Object]`, see `MClassDef::bound_mtype`.
559 # For generic classes, the mclass_type is also the way to get a formal
560 # generic parameter type.
562 # To get other types based on a generic class, see `get_mtype`.
564 # ENSURE: `mclass_type.mclass == self`
565 var mclass_type
: MClassType is noinit
567 # Return a generic type based on the class
568 # Is the class is not generic, then the result is `mclass_type`
570 # REQUIRE: `mtype_arguments.length == self.arity`
571 fun get_mtype
(mtype_arguments
: Array[MType]): MClassType
573 assert mtype_arguments
.length
== self.arity
574 if self.arity
== 0 then return self.mclass_type
575 var res
= get_mtype_cache
.get_or_null
(mtype_arguments
)
576 if res
!= null then return res
577 res
= new MGenericType(self, mtype_arguments
)
578 self.get_mtype_cache
[mtype_arguments
.to_a
] = res
582 private var get_mtype_cache
= new HashMap[Array[MType], MGenericType]
584 # Is there a `new` factory to allow the pseudo instantiation?
585 var has_new_factory
= false is writable
587 # Is `self` a standard or abstract class kind?
588 var is_class
: Bool is lazy
do return kind
== concrete_kind
or kind
== abstract_kind
590 # Is `self` an interface kind?
591 var is_interface
: Bool is lazy
do return kind
== interface_kind
593 # Is `self` an enum kind?
594 var is_enum
: Bool is lazy
do return kind
== enum_kind
596 # Is `self` and abstract class?
597 var is_abstract
: Bool is lazy
do return kind
== abstract_kind
599 redef var is_test
is lazy
do return intro
.is_test
601 redef fun mdoc_or_fallback
603 # Don’t use `intro.mdoc_or_fallback` because it would create an infinite
610 # A definition (an introduction or a refinement) of a class in a module
612 # A `MClassDef` is associated with an explicit (or almost) definition of a
613 # class. Unlike `MClass`, a `MClassDef` is a local definition that belong to
614 # a specific class and a specific module, and contains declarations like super-classes
617 # It is the class definitions that are the backbone of most things in the model:
618 # ClassDefs are defined with regard with other classdefs.
619 # Refinement and specialization are combined to produce a big poset called the `Model::mclassdef_hierarchy`.
621 # Moreover, the extension and the intention of types is defined by looking at the MClassDefs.
625 # The module where the definition is
628 # The associated `MClass`
629 var mclass
: MClass is noinit
631 # The bounded type associated to the mclassdef
633 # For a non-generic class, `bound_mtype` and `mclass.mclass_type`
637 # For the classdef Array[E: Object], the bound_mtype is Array[Object].
638 # If you want Array[E], then see `mclass.mclass_type`
640 # ENSURE: `bound_mtype.mclass == self.mclass`
641 var bound_mtype
: MClassType
645 redef fun visibility
do return mclass
.visibility
647 # Internal name combining the module and the class
648 # Example: "mymodule$MyClass"
649 redef var to_s
is noinit
653 self.mclass
= bound_mtype
.mclass
654 mmodule
.mclassdefs
.add
(self)
655 mclass
.mclassdefs
.add
(self)
656 if mclass
.intro_mmodule
== mmodule
then
657 assert not isset mclass
._intro
660 self.to_s
= "{mmodule}${mclass}"
663 # Actually the name of the `mclass`
664 redef fun name
do return mclass
.name
666 # The module and class name separated by a '$'.
668 # The short-name of the class is used for introduction.
669 # Example: "my_module$MyClass"
671 # The full-name of the class is used for refinement.
672 # Example: "my_module$intro_module::MyClass"
673 redef var full_name
is lazy
do
676 # private gives 'p::m$A'
677 return "{mmodule.namespace_for(mclass.visibility)}${mclass.name}"
678 else if mclass
.intro_mmodule
.mpackage
!= mmodule
.mpackage
then
679 # public gives 'q::n$p::A'
680 # private gives 'q::n$p::m::A'
681 return "{mmodule.full_name}${mclass.full_name}"
682 else if mclass
.visibility
> private_visibility
then
683 # public gives 'p::n$A'
684 return "{mmodule.full_name}${mclass.name}"
686 # private gives 'p::n$::m::A' (redundant p is omitted)
687 return "{mmodule.full_name}$::{mclass.intro_mmodule.name}::{mclass.name}"
691 redef var c_name
is lazy
do
693 return "{mmodule.c_namespace_for(mclass.visibility)}___{mclass.c_name}"
694 else if mclass
.intro_mmodule
.mpackage
== mmodule
.mpackage
and mclass
.visibility
> private_visibility
then
695 return "{mmodule.c_name}___{mclass.name.to_cmangle}"
697 return "{mmodule.c_name}___{mclass.c_name}"
701 redef fun model
do return mmodule
.model
703 # All declared super-types
704 # FIXME: quite ugly but not better idea yet
705 var supertypes
= new Array[MClassType]
707 # Register some super-types for the class (ie "super SomeType")
709 # The hierarchy must not already be set
710 # REQUIRE: `self.in_hierarchy == null`
711 fun set_supertypes
(supertypes
: Array[MClassType])
713 assert unique_invocation
: self.in_hierarchy
== null
714 var mmodule
= self.mmodule
715 var model
= mmodule
.model
716 var mtype
= self.bound_mtype
718 for supertype
in supertypes
do
719 self.supertypes
.add
(supertype
)
721 # Register in full_type_specialization_hierarchy
722 model
.full_mtype_specialization_hierarchy
.add_edge
(mtype
, supertype
)
723 # Register in intro_type_specialization_hierarchy
724 if mclass
.intro_mmodule
== mmodule
and supertype
.mclass
.intro_mmodule
== mmodule
then
725 model
.intro_mtype_specialization_hierarchy
.add_edge
(mtype
, supertype
)
731 # Collect the super-types (set by set_supertypes) to build the hierarchy
733 # This function can only invoked once by class
734 # REQUIRE: `self.in_hierarchy == null`
735 # ENSURE: `self.in_hierarchy != null`
738 assert unique_invocation
: self.in_hierarchy
== null
739 var model
= mmodule
.model
740 var res
= model
.mclassdef_hierarchy
.add_node
(self)
741 self.in_hierarchy
= res
742 var mtype
= self.bound_mtype
744 # Here we need to connect the mclassdef to its pairs in the mclassdef_hierarchy
745 # The simpliest way is to attach it to collect_mclassdefs
746 for mclassdef
in mtype
.collect_mclassdefs
(mmodule
) do
747 res
.poset
.add_edge
(self, mclassdef
)
751 # The view of the class definition in `mclassdef_hierarchy`
752 var in_hierarchy
: nullable POSetElement[MClassDef] = null
754 # Is the definition the one that introduced `mclass`?
755 fun is_intro
: Bool do return isset mclass
._intro
and mclass
.intro
== self
757 # All properties introduced by the classdef
758 var intro_mproperties
= new Array[MProperty]
760 # All property introductions and redefinitions in `self` (not inheritance).
761 var mpropdefs
= new Array[MPropDef]
763 # All property introductions and redefinitions (not inheritance) in `self` by its associated property.
764 var mpropdefs_by_property
= new HashMap[MProperty, MPropDef]
766 redef fun mdoc_or_fallback
do return mdoc
or else mclass
.mdoc_or_fallback
769 # A global static type
771 # MType are global to the model; it means that a `MType` is not bound to a
772 # specific `MModule`.
773 # This characteristic helps the reasoning about static types in a program
774 # since a single `MType` object always denote the same type.
776 # However, because a `MType` is global, it does not really have properties
777 # nor have subtypes to a hierarchy since the property and the class hierarchy
778 # depends of a module.
779 # Moreover, virtual types an formal generic parameter types also depends on
780 # a receiver to have sense.
782 # Therefore, most method of the types require a module and an anchor.
783 # The module is used to know what are the classes and the specialization
785 # The anchor is used to know what is the bound of the virtual types and formal
786 # generic parameter types.
788 # MType are not directly usable to get properties. See the `anchor_to` method
789 # and the `MClassType` class.
791 # FIXME: the order of the parameters is not the best. We mus pick on from:
792 # * foo(mmodule, anchor, othertype)
793 # * foo(othertype, anchor, mmodule)
794 # * foo(anchor, mmodule, othertype)
795 # * foo(othertype, mmodule, anchor)
799 redef fun name
do return to_s
801 # Return true if `self` is an subtype of `sup`.
802 # The typing is done using the standard typing policy of Nit.
804 # REQUIRE: `anchor == null implies not self.need_anchor and not sup.need_anchor`
805 # REQUIRE: `anchor != null implies self.can_resolve_for(anchor, null, mmodule) and sup.can_resolve_for(anchor, null, mmodule)`
806 fun is_subtype
(mmodule
: MModule, anchor
: nullable MClassType, sup
: MType): Bool
809 if sub
== sup
then return true
811 #print "1.is {sub} a {sup}? ===="
813 if anchor
== null then
814 assert not sub
.need_anchor
815 assert not sup
.need_anchor
817 # First, resolve the formal types to the simplest equivalent forms in the receiver
818 assert sub
.can_resolve_for
(anchor
, null, mmodule
)
819 sub
= sub
.lookup_fixed
(mmodule
, anchor
)
820 assert sup
.can_resolve_for
(anchor
, null, mmodule
)
821 sup
= sup
.lookup_fixed
(mmodule
, anchor
)
824 # Does `sup` accept null or not?
825 # Discard the nullable marker if it exists
826 var sup_accept_null
= false
827 if sup
isa MNullableType then
828 sup_accept_null
= true
830 else if sup
isa MNotNullType then
832 else if sup
isa MNullType then
833 sup_accept_null
= true
836 # Can `sub` provide null or not?
837 # Thus we can match with `sup_accept_null`
838 # Also discard the nullable marker if it exists
839 var sub_reject_null
= false
840 if sub
isa MNullableType then
841 if not sup_accept_null
then return false
843 else if sub
isa MNotNullType then
844 sub_reject_null
= true
846 else if sub
isa MNullType then
847 return sup_accept_null
849 # Now the case of direct null and nullable is over.
851 # If `sub` is a formal type, then it is accepted if its bound is accepted
852 while sub
isa MFormalType do
853 #print "3.is {sub} a {sup}?"
855 # A unfixed formal type can only accept itself
856 if sub
== sup
then return true
858 assert anchor
!= null
859 sub
= sub
.lookup_bound
(mmodule
, anchor
)
860 if sub_reject_null
then sub
= sub
.as_notnull
862 #print "3.is {sub} a {sup}?"
864 # Manage the second layer of null/nullable
865 if sub
isa MNullableType then
866 if not sup_accept_null
and not sub_reject_null
then return false
868 else if sub
isa MNotNullType then
869 sub_reject_null
= true
871 else if sub
isa MNullType then
872 return sup_accept_null
875 #print "4.is {sub} a {sup}? <- no more resolution"
877 if sub
isa MBottomType or sub
isa MErrorType then
881 assert sub
isa MClassType else print_error
"{sub} <? {sup}" # It is the only remaining type
883 # Handle sup-type when the sub-type is class-based (other cases must have be identified before).
884 if sup
isa MFormalType or sup
isa MNullType or sup
isa MBottomType or sup
isa MErrorType then
885 # These types are not super-types of Class-based types.
889 assert sup
isa MClassType else print_error
"got {sup} {sub.inspect}" # It is the only remaining type
891 # Now both are MClassType, we need to dig
893 if sub
== sup
then return true
895 if anchor
== null then anchor
= sub
# UGLY: any anchor will work
896 var resolved_sub
= sub
.anchor_to
(mmodule
, anchor
)
897 var res
= resolved_sub
.collect_mclasses
(mmodule
).has
(sup
.mclass
)
898 if not res
then return false
899 if not sup
isa MGenericType then return true
900 var sub2
= sub
.supertype_to
(mmodule
, anchor
, sup
.mclass
)
901 assert sub2
.mclass
== sup
.mclass
902 for i
in [0..sup
.mclass
.arity
[ do
903 var sub_arg
= sub2
.arguments
[i
]
904 var sup_arg
= sup
.arguments
[i
]
905 res
= sub_arg
.is_subtype
(mmodule
, anchor
, sup_arg
)
906 if not res
then return false
911 # The base class type on which self is based
913 # This base type is used to get property (an internally to perform
914 # unsafe type comparison).
916 # Beware: some types (like null) are not based on a class thus this
919 # Basically, this function transform the virtual types and parameter
920 # types to their bounds.
925 # class B super A end
927 # class Y super X end
936 # Map[T,U] anchor_to H #-> Map[B,Y]
938 # Explanation of the example:
939 # In H, T is set to B, because "H super G[B]", and U is bound to Y,
940 # because "redef type U: Y". Therefore, Map[T, U] is bound to
943 # REQUIRE: `self.need_anchor implies anchor != null`
944 # ENSURE: `not self.need_anchor implies result == self`
945 # ENSURE: `not result.need_anchor`
946 fun anchor_to
(mmodule
: MModule, anchor
: nullable MClassType): MType
948 if not need_anchor
then return self
949 assert anchor
!= null and not anchor
.need_anchor
950 # Just resolve to the anchor and clear all the virtual types
951 var res
= self.resolve_for
(anchor
, null, mmodule
, true)
952 assert not res
.need_anchor
956 # Does `self` contain a virtual type or a formal generic parameter type?
957 # In order to remove those types, you usually want to use `anchor_to`.
958 fun need_anchor
: Bool do return true
960 # Return the supertype when adapted to a class.
962 # In Nit, for each super-class of a type, there is a equivalent super-type.
968 # class H[V] super G[V, Bool] end
970 # H[Int] supertype_to G #-> G[Int, Bool]
973 # REQUIRE: `super_mclass` is a super-class of `self`
974 # REQUIRE: `self.need_anchor implies anchor != null and self.can_resolve_for(anchor, null, mmodule)`
975 # ENSURE: `result.mclass = super_mclass`
976 fun supertype_to
(mmodule
: MModule, anchor
: nullable MClassType, super_mclass
: MClass): MClassType
978 if super_mclass
.arity
== 0 then return super_mclass
.mclass_type
979 if self isa MClassType and self.mclass
== super_mclass
then return self
981 if self.need_anchor
then
982 assert anchor
!= null
983 resolved_self
= self.anchor_to
(mmodule
, anchor
)
987 var supertypes
= resolved_self
.collect_mtypes
(mmodule
)
988 for supertype
in supertypes
do
989 if supertype
.mclass
== super_mclass
then
990 # FIXME: Here, we stop on the first goal. Should we check others and detect inconsistencies?
991 return supertype
.resolve_for
(self, anchor
, mmodule
, false)
997 # Replace formals generic types in self with resolved values in `mtype`
998 # If `cleanup_virtual` is true, then virtual types are also replaced
1001 # This function returns self if `need_anchor` is false.
1007 # class H[F] super G[F] end
1011 # * Array[E].resolve_for(H[Int]) #-> Array[Int]
1012 # * Array[E].resolve_for(G[Z], X[Int]) #-> Array[Z]
1014 # Explanation of the example:
1015 # * Array[E].need_anchor is true because there is a formal generic parameter type E
1016 # * E makes sense for H[Int] because E is a formal parameter of G and H specialize G
1017 # * Since "H[F] super G[F]", E is in fact F for H
1018 # * More specifically, in H[Int], E is Int
1019 # * So, in H[Int], Array[E] is Array[Int]
1021 # This function is mainly used to inherit a signature.
1022 # Because, unlike `anchor_to`, we do not want a full resolution of
1023 # a type but only an adapted version of it.
1029 # fun foo(e:E):E is abstract
1031 # class B super A[Int] end
1034 # The signature on foo is (e: E): E
1035 # If we resolve the signature for B, we get (e:Int):Int
1041 # fun foo(e:E):E is abstract
1044 # var a: A[Array[F]]
1045 # fun bar do a.foo(x) # <- x is here
1049 # The first question is: is foo available on `a`?
1051 # The static type of a is `A[Array[F]]`, that is an open type.
1052 # in order to find a method `foo`, whe must look at a resolved type.
1054 # A[Array[F]].anchor_to(C[nullable Object]) #-> A[Array[nullable Object]]
1056 # the method `foo` exists in `A[Array[nullable Object]]`, therefore `foo` exists for `a`.
1058 # The next question is: what is the accepted types for `x`?
1060 # the signature of `foo` is `foo(e:E)`, thus we must resolve the type E
1062 # E.resolve_for(A[Array[F]],C[nullable Object]) #-> Array[F]
1064 # The resolution can be done because `E` make sense for the class A (see `can_resolve_for`)
1066 # FIXME: the parameter `cleanup_virtual` is just a bad idea, but having
1067 # two function instead of one seems also to be a bad idea.
1069 # REQUIRE: `can_resolve_for(mtype, anchor, mmodule)`
1070 # ENSURE: `not self.need_anchor implies result == self`
1071 fun resolve_for
(mtype
: MType, anchor
: nullable MClassType, mmodule
: MModule, cleanup_virtual
: Bool): MType is abstract
1073 # Resolve formal type to its verbatim bound.
1074 # If the type is not formal, just return self
1076 # The result is returned exactly as declared in the "type" property (verbatim).
1077 # So it could be another formal type.
1079 # In case of conflicts or inconsistencies in the model, the method returns a `MErrorType`.
1080 fun lookup_bound
(mmodule
: MModule, resolved_receiver
: MType): MType do return self
1082 # Resolve the formal type to its simplest equivalent form.
1084 # Formal types are either free or fixed.
1085 # When it is fixed, it means that it is equivalent with a simpler type.
1086 # When a formal type is free, it means that it is only equivalent with itself.
1087 # This method return the most simple equivalent type of `self`.
1089 # This method is mainly used for subtype test in order to sanely compare fixed.
1091 # By default, return self.
1092 # See the redefinitions for specific behavior in each kind of type.
1094 # In case of conflicts or inconsistencies in the model, the method returns a `MErrorType`.
1095 fun lookup_fixed
(mmodule
: MModule, resolved_receiver
: MType): MType do return self
1097 # Is the type a `MErrorType` or contains an `MErrorType`?
1099 # `MErrorType` are used in result with conflict or inconsistencies.
1101 # See `is_legal_in` to check conformity with generic bounds.
1102 fun is_ok
: Bool do return true
1104 # Is the type legal in a given `mmodule` (with an optional `anchor`)?
1106 # A type is valid if:
1108 # * it does not contain a `MErrorType` (see `is_ok`).
1109 # * its generic formal arguments are within their bounds.
1110 fun is_legal_in
(mmodule
: MModule, anchor
: nullable MClassType): Bool do return is_ok
1112 # Can the type be resolved?
1114 # In order to resolve open types, the formal types must make sence.
1124 # E.can_resolve_for(A[Int]) #-> true, E make sense in A
1126 # E.can_resolve_for(B[Int]) #-> false, E does not make sense in B
1128 # B[E].can_resolve_for(A[F], B[Object]) #-> true,
1129 # # B[E] is a red hearing only the E is important,
1130 # # E make sense in A
1133 # REQUIRE: `anchor != null implies not anchor.need_anchor`
1134 # REQUIRE: `mtype.need_anchor implies anchor != null and mtype.can_resolve_for(anchor, null, mmodule)`
1135 # ENSURE: `not self.need_anchor implies result == true`
1136 fun can_resolve_for
(mtype
: MType, anchor
: nullable MClassType, mmodule
: MModule): Bool is abstract
1138 # Return the nullable version of the type
1139 # If the type is already nullable then self is returned
1140 fun as_nullable
: MType
1142 var res
= self.as_nullable_cache
1143 if res
!= null then return res
1144 res
= new MNullableType(self)
1145 self.as_nullable_cache
= res
1149 # Remove the base type of a decorated (proxy) type.
1150 # Is the type is not decorated, then self is returned.
1152 # Most of the time it is used to return the not nullable version of a nullable type.
1153 # In this case, this just remove the `nullable` notation, but the result can still contains null.
1154 # For instance if `self isa MNullType` or self is a formal type bounded by a nullable type.
1155 # If you really want to exclude the `null` value, then use `as_notnull`
1156 fun undecorate
: MType
1161 # Returns the not null version of the type.
1162 # That is `self` minus the `null` value.
1164 # For most types, this return `self`.
1165 # For formal types, this returns a special `MNotNullType`
1166 fun as_notnull
: MType do return self
1168 private var as_nullable_cache
: nullable MType = null
1171 # The depth of the type seen as a tree.
1178 # Formal types have a depth of 1.
1179 # Only `MClassType` and `MFormalType` nodes are counted.
1185 # The length of the type seen as a tree.
1192 # Formal types have a length of 1.
1193 # Only `MClassType` and `MFormalType` nodes are counted.
1199 # Compute all the classdefs inherited/imported.
1200 # The returned set contains:
1201 # * the class definitions from `mmodule` and its imported modules
1202 # * the class definitions of this type and its super-types
1204 # This function is used mainly internally.
1206 # REQUIRE: `not self.need_anchor`
1207 fun collect_mclassdefs
(mmodule
: MModule): Set[MClassDef] is abstract
1209 # Compute all the super-classes.
1210 # This function is used mainly internally.
1212 # REQUIRE: `not self.need_anchor`
1213 fun collect_mclasses
(mmodule
: MModule): Set[MClass] is abstract
1215 # Compute all the declared super-types.
1216 # Super-types are returned as declared in the classdefs (verbatim).
1217 # This function is used mainly internally.
1219 # REQUIRE: `not self.need_anchor`
1220 fun collect_mtypes
(mmodule
: MModule): Set[MClassType] is abstract
1222 # Is the property in self for a given module
1223 # This method does not filter visibility or whatever
1225 # REQUIRE: `not self.need_anchor`
1226 fun has_mproperty
(mmodule
: MModule, mproperty
: MProperty): Bool
1228 assert not self.need_anchor
1229 return self.collect_mclassdefs
(mmodule
).has
(mproperty
.intro_mclassdef
)
1233 # A type based on a class.
1235 # `MClassType` have properties (see `has_mproperty`).
1239 # The associated class
1242 redef fun model
do return self.mclass
.intro_mmodule
.model
1244 redef fun location
do return mclass
.location
1246 # TODO: private init because strongly bounded to its mclass. see `mclass.mclass_type`
1248 # The formal arguments of the type
1249 # ENSURE: `result.length == self.mclass.arity`
1250 var arguments
= new Array[MType]
1252 redef fun to_s
do return mclass
.to_s
1254 redef fun full_name
do return mclass
.full_name
1256 redef fun c_name
do return mclass
.c_name
1258 redef fun need_anchor
do return false
1260 redef fun anchor_to
(mmodule
, anchor
): MClassType
1262 return super.as(MClassType)
1265 redef fun resolve_for
(mtype
: MType, anchor
: nullable MClassType, mmodule
: MModule, cleanup_virtual
: Bool): MClassType do return self
1267 redef fun can_resolve_for
(mtype
, anchor
, mmodule
) do return true
1269 redef fun collect_mclassdefs
(mmodule
)
1271 assert not self.need_anchor
1272 var cache
= self.collect_mclassdefs_cache
1273 if not cache
.has_key
(mmodule
) then
1274 self.collect_things
(mmodule
)
1276 return cache
[mmodule
]
1279 redef fun collect_mclasses
(mmodule
)
1281 if collect_mclasses_last_module
== mmodule
then return collect_mclasses_last_module_cache
1282 assert not self.need_anchor
1283 var cache
= self.collect_mclasses_cache
1284 if not cache
.has_key
(mmodule
) then
1285 self.collect_things
(mmodule
)
1287 var res
= cache
[mmodule
]
1288 collect_mclasses_last_module
= mmodule
1289 collect_mclasses_last_module_cache
= res
1293 private var collect_mclasses_last_module
: nullable MModule = null
1294 private var collect_mclasses_last_module_cache
: Set[MClass] is noinit
1296 redef fun collect_mtypes
(mmodule
)
1298 assert not self.need_anchor
1299 var cache
= self.collect_mtypes_cache
1300 if not cache
.has_key
(mmodule
) then
1301 self.collect_things
(mmodule
)
1303 return cache
[mmodule
]
1306 # common implementation for `collect_mclassdefs`, `collect_mclasses`, and `collect_mtypes`.
1307 private fun collect_things
(mmodule
: MModule)
1309 var res
= new HashSet[MClassDef]
1310 var seen
= new HashSet[MClass]
1311 var types
= new HashSet[MClassType]
1312 seen
.add
(self.mclass
)
1313 var todo
= [self.mclass
]
1314 while not todo
.is_empty
do
1315 var mclass
= todo
.pop
1316 #print "process {mclass}"
1317 for mclassdef
in mclass
.mclassdefs
do
1318 if not mmodule
.in_importation
<= mclassdef
.mmodule
then continue
1319 #print " process {mclassdef}"
1321 for supertype
in mclassdef
.supertypes
do
1322 types
.add
(supertype
)
1323 var superclass
= supertype
.mclass
1324 if seen
.has
(superclass
) then continue
1325 #print " add {superclass}"
1326 seen
.add
(superclass
)
1327 todo
.add
(superclass
)
1331 collect_mclassdefs_cache
[mmodule
] = res
1332 collect_mclasses_cache
[mmodule
] = seen
1333 collect_mtypes_cache
[mmodule
] = types
1336 private var collect_mclassdefs_cache
= new HashMap[MModule, Set[MClassDef]]
1337 private var collect_mclasses_cache
= new HashMap[MModule, Set[MClass]]
1338 private var collect_mtypes_cache
= new HashMap[MModule, Set[MClassType]]
1340 redef fun mdoc_or_fallback
do return mclass
.mdoc_or_fallback
1343 # A type based on a generic class.
1344 # A generic type a just a class with additional formal generic arguments.
1350 # TODO: private init because strongly bounded to its mclass. see `mclass.get_mtype`
1354 assert self.mclass
.arity
== arguments
.length
1356 self.need_anchor
= false
1357 for t
in arguments
do
1358 if t
.need_anchor
then
1359 self.need_anchor
= true
1364 self.to_s
= "{mclass}[{arguments.join(", ")}]"
1367 # The short-name of the class, then the full-name of each type arguments within brackets.
1368 # Example: `"Map[String, List[Int]]"`
1369 redef var to_s
is noinit
1371 # The full-name of the class, then the full-name of each type arguments within brackets.
1372 # Example: `"core::Map[core::String, core::List[core::Int]]"`
1373 redef var full_name
is lazy
do
1374 var args
= new Array[String]
1375 for t
in arguments
do
1376 args
.add t
.full_name
1378 return "{mclass.full_name}[{args.join(", ")}]"
1381 redef var c_name
is lazy
do
1382 var res
= mclass
.c_name
1383 # Note: because the arity is known, a prefix notation is enough
1384 for t
in arguments
do
1391 redef var need_anchor
is noinit
1393 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1395 if not need_anchor
then return self
1396 assert can_resolve_for
(mtype
, anchor
, mmodule
)
1397 var types
= new Array[MType]
1398 for t
in arguments
do
1399 types
.add
(t
.resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
))
1401 return mclass
.get_mtype
(types
)
1404 redef fun can_resolve_for
(mtype
, anchor
, mmodule
)
1406 if not need_anchor
then return true
1407 for t
in arguments
do
1408 if not t
.can_resolve_for
(mtype
, anchor
, mmodule
) then return false
1415 for t
in arguments
do if not t
.is_ok
then return false
1419 redef fun is_legal_in
(mmodule
, anchor
)
1423 assert anchor
!= null
1424 mtype
= anchor_to
(mmodule
, anchor
)
1428 if not mtype
.is_ok
then return false
1429 return mtype
.is_subtype
(mmodule
, null, mtype
.mclass
.intro
.bound_mtype
)
1435 for a
in self.arguments
do
1437 if d
> dmax
then dmax
= d
1445 for a
in self.arguments
do
1452 # A formal type (either virtual of parametric).
1454 # The main issue with formal types is that they offer very little information on their own
1455 # and need a context (anchor and mmodule) to be useful.
1456 abstract class MFormalType
1459 redef var as_notnull
= new MNotNullType(self) is lazy
1462 # A virtual formal type.
1466 # The property associated with the type.
1467 # Its the definitions of this property that determine the bound or the virtual type.
1468 var mproperty
: MVirtualTypeProp
1470 redef fun location
do return mproperty
.location
1472 redef fun model
do return self.mproperty
.intro_mclassdef
.mmodule
.model
1474 redef fun lookup_bound
(mmodule
, resolved_receiver
)
1476 # There is two possible invalid cases: the vt does not exists in resolved_receiver or the bound is broken
1477 if not resolved_receiver
.has_mproperty
(mmodule
, mproperty
) then return new MErrorType(model
)
1478 return lookup_single_definition
(mmodule
, resolved_receiver
).bound
or else new MErrorType(model
)
1481 private fun lookup_single_definition
(mmodule
: MModule, resolved_receiver
: MType): MVirtualTypeDef
1483 assert not resolved_receiver
.need_anchor
1484 var props
= self.mproperty
.lookup_definitions
(mmodule
, resolved_receiver
)
1485 if props
.is_empty
then
1487 else if props
.length
== 1 then
1490 var types
= new ArraySet[MType]
1491 var res
= props
.first
1493 types
.add
(p
.bound
.as(not null))
1494 if not res
.is_fixed
then res
= p
1496 if types
.length
== 1 then
1502 # A VT is fixed when:
1503 # * the VT is (re-)defined with the annotation `is fixed`
1504 # * the receiver is an enum class since there is no subtype that can
1505 # redefine this virtual type
1506 redef fun lookup_fixed
(mmodule
: MModule, resolved_receiver
: MType): MType
1508 assert not resolved_receiver
.need_anchor
1509 resolved_receiver
= resolved_receiver
.undecorate
1510 assert resolved_receiver
isa MClassType # It is the only remaining type
1512 var prop
= lookup_single_definition
(mmodule
, resolved_receiver
)
1513 var res
= prop
.bound
1514 if res
== null then return new MErrorType(model
)
1516 # Recursively lookup the fixed result
1517 res
= res
.lookup_fixed
(mmodule
, resolved_receiver
)
1519 # For a fixed VT, return the resolved bound
1520 if prop
.is_fixed
then return res
1522 # For a enum receiver return the bound
1523 if resolved_receiver
.mclass
.kind
== enum_kind
then return res
1528 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1530 if not cleanup_virtual
then return self
1531 assert can_resolve_for
(mtype
, anchor
, mmodule
)
1533 if mproperty
.is_selftype
then return mtype
1535 # self is a virtual type declared (or inherited) in mtype
1536 # The point of the function it to get the bound of the virtual type that make sense for mtype
1537 # But because mtype is maybe a virtual/formal type, we need to get a real receiver first
1538 #print "{class_name}: {self}/{mtype}/{anchor}?"
1539 var resolved_receiver
1540 if mtype
.need_anchor
then
1541 assert anchor
!= null
1542 resolved_receiver
= mtype
.resolve_for
(anchor
, null, mmodule
, true)
1544 resolved_receiver
= mtype
1546 # Now, we can get the bound
1547 var verbatim_bound
= lookup_bound
(mmodule
, resolved_receiver
)
1548 # The bound is exactly as declared in the "type" property, so we must resolve it again
1549 var res
= verbatim_bound
.resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1554 redef fun can_resolve_for
(mtype
, anchor
, mmodule
)
1556 if mtype
.need_anchor
then
1557 assert anchor
!= null
1558 mtype
= mtype
.anchor_to
(mmodule
, anchor
)
1560 return mtype
.has_mproperty
(mmodule
, mproperty
)
1563 redef fun to_s
do return self.mproperty
.to_s
1565 redef fun full_name
do return self.mproperty
.full_name
1567 redef fun c_name
do return self.mproperty
.c_name
1569 redef fun mdoc_or_fallback
do return mproperty
.mdoc_or_fallback
1572 # The type associated to a formal parameter generic type of a class
1574 # Each parameter type is associated to a specific class.
1575 # It means that all refinements of a same class "share" the parameter type,
1576 # but that a generic subclass has its own parameter types.
1578 # However, in the sense of the meta-model, a parameter type of a class is
1579 # a valid type in a subclass. The "in the sense of the meta-model" is
1580 # important because, in the Nit language, the programmer cannot refers
1581 # directly to the parameter types of the super-classes.
1586 # fun e: E is abstract
1592 # In the class definition B[F], `F` is a valid type but `E` is not.
1593 # However, `self.e` is a valid method call, and the signature of `e` is
1596 # Note that parameter types are shared among class refinements.
1597 # Therefore parameter only have an internal name (see `to_s` for details).
1598 class MParameterType
1601 # The generic class where the parameter belong
1604 redef fun model
do return self.mclass
.intro_mmodule
.model
1606 redef fun location
do return mclass
.location
1608 # The position of the parameter (0 for the first parameter)
1609 # FIXME: is `position` a better name?
1614 redef fun to_s
do return name
1616 redef var full_name
is lazy
do return "{mclass.full_name}::{name}"
1618 redef var c_name
is lazy
do return mclass
.c_name
+ "__" + "#{name}".to_cmangle
1620 redef fun lookup_bound
(mmodule
: MModule, resolved_receiver
: MType): MType
1622 assert not resolved_receiver
.need_anchor
1623 resolved_receiver
= resolved_receiver
.undecorate
1624 assert resolved_receiver
isa MClassType # It is the only remaining type
1625 var goalclass
= self.mclass
1626 if resolved_receiver
.mclass
== goalclass
then
1627 return resolved_receiver
.arguments
[self.rank
]
1629 var supertypes
= resolved_receiver
.collect_mtypes
(mmodule
)
1630 for t
in supertypes
do
1631 if t
.mclass
== goalclass
then
1632 # Yeah! c specialize goalclass with a "super `t'". So the question is what is the argument of f
1633 # FIXME: Here, we stop on the first goal. Should we check others and detect inconsistencies?
1634 var res
= t
.arguments
[self.rank
]
1638 # Cannot found `self` in `resolved_receiver`
1639 return new MErrorType(model
)
1642 # A PT is fixed when:
1643 # * The `resolved_receiver` is a subclass of `self.mclass`,
1644 # so it is necessarily fixed in a `super` clause, either with a normal type
1645 # or with another PT.
1646 # See `resolve_for` for examples about related issues.
1647 redef fun lookup_fixed
(mmodule
: MModule, resolved_receiver
: MType): MType
1649 assert not resolved_receiver
.need_anchor
1650 resolved_receiver
= resolved_receiver
.undecorate
1651 assert resolved_receiver
isa MClassType # It is the only remaining type
1652 var res
= self.resolve_for
(resolved_receiver
.mclass
.mclass_type
, resolved_receiver
, mmodule
, false)
1656 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1658 assert can_resolve_for
(mtype
, anchor
, mmodule
)
1659 #print "{class_name}: {self}/{mtype}/{anchor}?"
1661 if mtype
isa MGenericType and mtype
.mclass
== self.mclass
then
1662 return mtype
.arguments
[self.rank
]
1665 # self is a parameter type of mtype (or of a super-class of mtype)
1666 # The point of the function it to get the bound of the virtual type that make sense for mtype
1667 # But because mtype is maybe a virtual/formal type, we need to get a real receiver first
1668 # FIXME: What happens here is far from clear. Thus this part must be validated and clarified
1669 var resolved_receiver
1670 if mtype
.need_anchor
then
1671 assert anchor
!= null
1672 resolved_receiver
= mtype
.resolve_for
(anchor
.mclass
.mclass_type
, anchor
, mmodule
, true)
1674 resolved_receiver
= mtype
1676 if resolved_receiver
isa MNullableType then resolved_receiver
= resolved_receiver
.mtype
1677 if resolved_receiver
isa MParameterType then
1678 assert anchor
!= null
1679 assert resolved_receiver
.mclass
== anchor
.mclass
1680 resolved_receiver
= anchor
.arguments
[resolved_receiver
.rank
]
1681 if resolved_receiver
isa MNullableType then resolved_receiver
= resolved_receiver
.mtype
1683 assert resolved_receiver
isa MClassType # It is the only remaining type
1685 # Eh! The parameter is in the current class.
1686 # So we return the corresponding argument, no mater what!
1687 if resolved_receiver
.mclass
== self.mclass
then
1688 var res
= resolved_receiver
.arguments
[self.rank
]
1689 #print "{class_name}: {self}/{mtype}/{anchor} -> direct {res}"
1693 if resolved_receiver
.need_anchor
then
1694 assert anchor
!= null
1695 resolved_receiver
= resolved_receiver
.resolve_for
(anchor
, null, mmodule
, false)
1697 # Now, we can get the bound
1698 var verbatim_bound
= lookup_bound
(mmodule
, resolved_receiver
)
1699 # The bound is exactly as declared in the "type" property, so we must resolve it again
1700 var res
= verbatim_bound
.resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1702 #print "{class_name}: {self}/{mtype}/{anchor} -> indirect {res}"
1707 redef fun can_resolve_for
(mtype
, anchor
, mmodule
)
1709 if mtype
.need_anchor
then
1710 assert anchor
!= null
1711 mtype
= mtype
.anchor_to
(mmodule
, anchor
)
1713 return mtype
.collect_mclassdefs
(mmodule
).has
(mclass
.intro
)
1717 # A type that decorates another type.
1719 # The point of this class is to provide a common implementation of sevices that just forward to the original type.
1720 # Specific decorator are expected to redefine (or to extend) the default implementation as this suit them.
1721 abstract class MProxyType
1726 redef fun location
do return mtype
.location
1728 redef fun model
do return self.mtype
.model
1729 redef fun need_anchor
do return mtype
.need_anchor
1730 redef fun as_nullable
do return mtype
.as_nullable
1731 redef fun as_notnull
do return mtype
.as_notnull
1732 redef fun undecorate
do return mtype
.undecorate
1733 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1735 var res
= self.mtype
.resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1739 redef fun can_resolve_for
(mtype
, anchor
, mmodule
)
1741 return self.mtype
.can_resolve_for
(mtype
, anchor
, mmodule
)
1744 redef fun is_ok
do return mtype
.is_ok
1746 redef fun is_legal_in
(mmodule
, anchor
) do return mtype
.is_legal_in
(mmodule
, anchor
)
1748 redef fun lookup_fixed
(mmodule
, resolved_receiver
)
1750 var t
= mtype
.lookup_fixed
(mmodule
, resolved_receiver
)
1754 redef fun depth
do return self.mtype
.depth
1756 redef fun length
do return self.mtype
.length
1758 redef fun collect_mclassdefs
(mmodule
)
1760 assert not self.need_anchor
1761 return self.mtype
.collect_mclassdefs
(mmodule
)
1764 redef fun collect_mclasses
(mmodule
)
1766 assert not self.need_anchor
1767 return self.mtype
.collect_mclasses
(mmodule
)
1770 redef fun collect_mtypes
(mmodule
)
1772 assert not self.need_anchor
1773 return self.mtype
.collect_mtypes
(mmodule
)
1777 # A type prefixed with "nullable"
1783 self.to_s
= "nullable {mtype}"
1786 redef var to_s
is noinit
1788 redef var full_name
is lazy
do return "nullable {mtype.full_name}"
1790 redef var c_name
is lazy
do return "nullable__{mtype.c_name}"
1792 redef fun as_nullable
do return self
1793 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1796 return res
.as_nullable
1799 # Efficiently returns `mtype.lookup_fixed(mmodule, resolved_receiver).as_nullable`
1800 redef fun lookup_fixed
(mmodule
, resolved_receiver
)
1803 if t
== mtype
then return self
1804 return t
.as_nullable
1807 redef fun mdoc_or_fallback
do return mtype
.mdoc_or_fallback
1810 # A non-null version of a formal type.
1812 # When a formal type in bounded to a nullable type, this is the type of the not null version of it.
1816 redef fun to_s
do return "not null {mtype}"
1817 redef var full_name
is lazy
do return "not null {mtype.full_name}"
1818 redef var c_name
is lazy
do return "notnull__{mtype.c_name}"
1820 redef fun as_notnull
do return self
1822 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
1825 return res
.as_notnull
1828 # Efficiently returns `mtype.lookup_fixed(mmodule, resolved_receiver).as_notnull`
1829 redef fun lookup_fixed
(mmodule
, resolved_receiver
)
1832 if t
== mtype
then return self
1837 # The type of the only value null
1839 # The is only one null type per model, see `MModel::null_type`.
1843 redef fun to_s
do return "null"
1844 redef fun full_name
do return "null"
1845 redef fun c_name
do return "null"
1846 redef fun as_nullable
do return self
1848 redef var as_notnull
: MBottomType = new MBottomType(model
) is lazy
1849 redef fun need_anchor
do return false
1850 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
) do return self
1851 redef fun can_resolve_for
(mtype
, anchor
, mmodule
) do return true
1853 redef fun collect_mclassdefs
(mmodule
) do return new HashSet[MClassDef]
1855 redef fun collect_mclasses
(mmodule
) do return new HashSet[MClass]
1857 redef fun collect_mtypes
(mmodule
) do return new HashSet[MClassType]
1860 # The special universal most specific type.
1862 # This type is intended to be only used internally for type computation or analysis and should not be exposed to the user.
1863 # The bottom type can de used to denote things that are dead (no instance).
1865 # Semantically it is the singleton `null.as_notnull`.
1866 # Is also means that `self.as_nullable == null`.
1870 redef fun to_s
do return "bottom"
1871 redef fun full_name
do return "bottom"
1872 redef fun c_name
do return "bottom"
1873 redef fun as_nullable
do return model
.null_type
1874 redef fun as_notnull
do return self
1875 redef fun need_anchor
do return false
1876 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
) do return self
1877 redef fun can_resolve_for
(mtype
, anchor
, mmodule
) do return true
1879 redef fun collect_mclassdefs
(mmodule
) do return new HashSet[MClassDef]
1881 redef fun collect_mclasses
(mmodule
) do return new HashSet[MClass]
1883 redef fun collect_mtypes
(mmodule
) do return new HashSet[MClassType]
1886 # A special type used as a silent error marker when building types.
1888 # This type is intended to be only used internally for type operation and should not be exposed to the user.
1889 # The error type can de used to denote things that are conflicting or inconsistent.
1891 # Some methods on types can return a `MErrorType` to denote a broken or a conflicting result.
1892 # Use `is_ok` to check if a type is (or contains) a `MErrorType` .
1896 redef fun to_s
do return "error"
1897 redef fun full_name
do return "error"
1898 redef fun c_name
do return "error"
1899 redef fun need_anchor
do return false
1900 redef fun resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
) do return self
1901 redef fun can_resolve_for
(mtype
, anchor
, mmodule
) do return true
1902 redef fun is_ok
do return false
1904 redef fun collect_mclassdefs
(mmodule
) do return new HashSet[MClassDef]
1906 redef fun collect_mclasses
(mmodule
) do return new HashSet[MClass]
1908 redef fun collect_mtypes
(mmodule
) do return new HashSet[MClassType]
1911 # A signature of a method
1915 # The each parameter (in order)
1916 var mparameters
: Array[MParameter]
1918 # Returns a parameter named `name`, if any.
1919 fun mparameter_by_name
(name
: String): nullable MParameter
1921 for p
in mparameters
do
1922 if p
.name
== name
then return p
1927 # The return type (null for a procedure)
1928 var return_mtype
: nullable MType
1933 var t
= self.return_mtype
1934 if t
!= null then dmax
= t
.depth
1935 for p
in mparameters
do
1936 var d
= p
.mtype
.depth
1937 if d
> dmax
then dmax
= d
1945 var t
= self.return_mtype
1946 if t
!= null then res
+= t
.length
1947 for p
in mparameters
do
1948 res
+= p
.mtype
.length
1953 # REQUIRE: 1 <= mparameters.count p -> p.is_vararg
1956 var vararg_rank
= -1
1957 for i
in [0..mparameters
.length
[ do
1958 var parameter
= mparameters
[i
]
1959 if parameter
.is_vararg
then
1960 if vararg_rank
>= 0 then
1961 # If there is more than one vararg,
1962 # consider that additional arguments cannot be mapped.
1969 self.vararg_rank
= vararg_rank
1972 # The rank of the main ellipsis (`...`) for vararg (starting from 0).
1973 # value is -1 if there is no vararg.
1974 # Example: for "(a: Int, b: Bool..., c: Char)" #-> vararg_rank=1
1976 # From a model POV, a signature can contain more than one vararg parameter,
1977 # the `vararg_rank` just indicates the one that will receive the additional arguments.
1978 # However, currently, if there is more that one vararg parameter, no one will be the main one,
1979 # and additional arguments will be refused.
1980 var vararg_rank
: Int is noinit
1982 # The number of parameters
1983 fun arity
: Int do return mparameters
.length
1987 var b
= new FlatBuffer
1988 if not mparameters
.is_empty
then
1990 var last_mtype
= null
1991 for i
in [0..mparameters
.length
[ do
1992 var mparameter
= mparameters
[i
]
1994 # Group types that are common to contiguous parameters
1995 if mparameter
.mtype
!= last_mtype
and last_mtype
!= null then
1997 b
.append
(last_mtype
.to_s
)
2000 if i
> 0 then b
.append
(", ")
2001 b
.append
(mparameter
.name
)
2003 if mparameter
.is_vararg
then
2005 b
.append
(mparameter
.mtype
.to_s
)
2009 last_mtype
= mparameter
.mtype
2013 if last_mtype
!= null then
2015 b
.append
(last_mtype
.to_s
)
2020 var ret
= self.return_mtype
2028 redef fun resolve_for
(mtype
: MType, anchor
: nullable MClassType, mmodule
: MModule, cleanup_virtual
: Bool): MSignature
2030 var params
= new Array[MParameter]
2031 for p
in self.mparameters
do
2032 params
.add
(p
.resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
))
2034 var ret
= self.return_mtype
2036 ret
= ret
.resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
2038 var res
= new MSignature(params
, ret
)
2043 # A parameter in a signature
2047 # The name of the parameter
2050 # The static type of the parameter
2053 # Is the parameter a vararg?
2059 return "{name}: {mtype}..."
2061 return "{name}: {mtype}"
2065 # Returns a new parameter with the `mtype` resolved.
2066 # See `MType::resolve_for` for details.
2067 fun resolve_for
(mtype
: MType, anchor
: nullable MClassType, mmodule
: MModule, cleanup_virtual
: Bool): MParameter
2069 if not self.mtype
.need_anchor
then return self
2070 var newtype
= self.mtype
.resolve_for
(mtype
, anchor
, mmodule
, cleanup_virtual
)
2071 var res
= new MParameter(self.name
, newtype
, self.is_vararg
)
2075 redef fun model
do return mtype
.model
2078 # A service (global property) that generalize method, attribute, etc.
2080 # `MProperty` are global to the model; it means that a `MProperty` is not bound
2081 # to a specific `MModule` nor a specific `MClass`.
2083 # A MProperty gather definitions (see `mpropdefs`) ; one for the introduction
2084 # and the other in subclasses and in refinements.
2086 # A `MProperty` is used to denotes services in polymorphic way (ie. independent
2087 # of any dynamic type).
2088 # For instance, a call site "x.foo" is associated to a `MProperty`.
2089 abstract class MProperty
2092 # The associated MPropDef subclass.
2093 # The two specialization hierarchy are symmetric.
2094 type MPROPDEF: MPropDef
2096 # The classdef that introduce the property
2097 # While a property is not bound to a specific module, or class,
2098 # the introducing mclassdef is used for naming and visibility
2099 var intro_mclassdef
: MClassDef
2101 # The (short) name of the property
2106 redef fun mdoc_or_fallback
2108 # Don’t use `intro.mdoc_or_fallback` because it would create an infinite
2113 # The canonical name of the property.
2115 # It is currently the short-`name` prefixed by the short-name of the class and the full-name of the module.
2116 # Example: "my_package::my_module::MyClass::my_method"
2118 # The full-name of the module is needed because two distinct modules of the same package can
2119 # still refine the same class and introduce homonym properties.
2121 # For public properties not introduced by refinement, the module name is not used.
2123 # Example: `my_package::MyClass::My_method`
2124 redef var full_name
is lazy
do
2125 if intro_mclassdef
.is_intro
then
2126 return "{intro_mclassdef.mmodule.namespace_for(visibility)}::{intro_mclassdef.mclass.name}::{name}"
2128 return "{intro_mclassdef.mmodule.full_name}::{intro_mclassdef.mclass.name}::{name}"
2132 redef var c_name
is lazy
do
2133 # FIXME use `namespace_for`
2134 return "{intro_mclassdef.mmodule.c_name}__{intro_mclassdef.mclass.name.to_cmangle}__{name.to_cmangle}"
2137 # The visibility of the property
2138 redef var visibility
2140 # Is the property usable as an initializer?
2141 var is_autoinit
= false is writable
2145 intro_mclassdef
.intro_mproperties
.add
(self)
2146 var model
= intro_mclassdef
.mmodule
.model
2147 model
.mproperties_by_name
.add_one
(name
, self)
2148 model
.mproperties
.add
(self)
2151 # All definitions of the property.
2152 # The first is the introduction,
2153 # The other are redefinitions (in refinements and in subclasses)
2154 var mpropdefs
= new Array[MPROPDEF]
2156 # The definition that introduces the property.
2158 # Warning: such a definition may not exist in the early life of the object.
2159 # In this case, the method will abort.
2160 var intro
: MPROPDEF is noinit
2162 redef fun model
do return intro
.model
2165 redef fun to_s
do return name
2167 # Return the most specific property definitions defined or inherited by a type.
2168 # The selection knows that refinement is stronger than specialization;
2169 # however, in case of conflict more than one property are returned.
2170 # If mtype does not know mproperty then an empty array is returned.
2172 # If you want the really most specific property, then look at `lookup_first_definition`
2174 # REQUIRE: `not mtype.need_anchor` to simplify the API (no `anchor` parameter)
2175 # ENSURE: `not mtype.has_mproperty(mmodule, self) == result.is_empty`
2176 fun lookup_definitions
(mmodule
: MModule, mtype
: MType): Array[MPROPDEF]
2178 assert not mtype
.need_anchor
2179 mtype
= mtype
.undecorate
2181 var cache
= self.lookup_definitions_cache
[mmodule
, mtype
]
2182 if cache
!= null then return cache
2184 #print "select prop {mproperty} for {mtype} in {self}"
2185 # First, select all candidates
2186 var candidates
= new Array[MPROPDEF]
2188 # Here we have two strategies: iterate propdefs or iterate classdefs.
2189 var mpropdefs
= self.mpropdefs
2190 if mpropdefs
.length
<= 1 or mpropdefs
.length
< mtype
.collect_mclassdefs
(mmodule
).length
then
2191 # Iterate on all definitions of `self`, keep only those inherited by `mtype` in `mmodule`
2192 for mpropdef
in mpropdefs
do
2193 # If the definition is not imported by the module, then skip
2194 if not mmodule
.in_importation
<= mpropdef
.mclassdef
.mmodule
then continue
2195 # If the definition is not inherited by the type, then skip
2196 if not mtype
.is_subtype
(mmodule
, null, mpropdef
.mclassdef
.bound_mtype
) then continue
2198 candidates
.add
(mpropdef
)
2201 # Iterate on all super-classdefs of `mtype`, keep only the definitions of `self`, if any.
2202 for mclassdef
in mtype
.collect_mclassdefs
(mmodule
) do
2203 var p
= mclassdef
.mpropdefs_by_property
.get_or_null
(self)
2204 if p
!= null then candidates
.add p
2208 # Fast track for only one candidate
2209 if candidates
.length
<= 1 then
2210 self.lookup_definitions_cache
[mmodule
, mtype
] = candidates
2214 # Second, filter the most specific ones
2215 return select_most_specific
(mmodule
, candidates
)
2218 private var lookup_definitions_cache
= new HashMap2[MModule, MType, Array[MPROPDEF]]
2220 # Return the most specific property definitions inherited by a type.
2221 # The selection knows that refinement is stronger than specialization;
2222 # however, in case of conflict more than one property are returned.
2223 # If mtype does not know mproperty then an empty array is returned.
2225 # If you want the really most specific property, then look at `lookup_next_definition`
2227 # REQUIRE: `not mtype.need_anchor` to simplify the API (no `anchor` parameter)
2228 # ENSURE: `not mtype.has_mproperty(mmodule, self) implies result.is_empty`
2229 fun lookup_super_definitions
(mmodule
: MModule, mtype
: MType): Array[MPROPDEF]
2231 assert not mtype
.need_anchor
2232 mtype
= mtype
.undecorate
2234 # First, select all candidates
2235 var candidates
= new Array[MPROPDEF]
2236 for mpropdef
in self.mpropdefs
do
2237 # If the definition is not imported by the module, then skip
2238 if not mmodule
.in_importation
<= mpropdef
.mclassdef
.mmodule
then continue
2239 # If the definition is not inherited by the type, then skip
2240 if not mtype
.is_subtype
(mmodule
, null, mpropdef
.mclassdef
.bound_mtype
) then continue
2241 # If the definition is defined by the type, then skip (we want the super, so e skip the current)
2242 if mtype
== mpropdef
.mclassdef
.bound_mtype
and mmodule
== mpropdef
.mclassdef
.mmodule
then continue
2244 candidates
.add
(mpropdef
)
2246 # Fast track for only one candidate
2247 if candidates
.length
<= 1 then return candidates
2249 # Second, filter the most specific ones
2250 return select_most_specific
(mmodule
, candidates
)
2253 # Return an array containing olny the most specific property definitions
2254 # This is an helper function for `lookup_definitions` and `lookup_super_definitions`
2255 private fun select_most_specific
(mmodule
: MModule, candidates
: Array[MPROPDEF]): Array[MPROPDEF]
2257 var res
= new Array[MPROPDEF]
2258 for pd1
in candidates
do
2259 var cd1
= pd1
.mclassdef
2262 for pd2
in candidates
do
2263 if pd2
== pd1
then continue # do not compare with self!
2264 var cd2
= pd2
.mclassdef
2266 if c2
.mclass_type
== c1
.mclass_type
then
2267 if cd2
.mmodule
.in_importation
< cd1
.mmodule
then
2268 # cd2 refines cd1; therefore we skip pd1
2272 else if cd2
.bound_mtype
.is_subtype
(mmodule
, null, cd1
.bound_mtype
) and cd2
.bound_mtype
!= cd1
.bound_mtype
then
2273 # cd2 < cd1; therefore we skip pd1
2282 if res
.is_empty
then
2283 print_error
"All lost! {candidates.join(", ")}"
2284 # FIXME: should be abort!
2289 # Return the most specific definition in the linearization of `mtype`.
2291 # If you want to know the next properties in the linearization,
2292 # look at `MPropDef::lookup_next_definition`.
2294 # FIXME: the linearization is still unspecified
2296 # REQUIRE: `not mtype.need_anchor` to simplify the API (no `anchor` parameter)
2297 # REQUIRE: `mtype.has_mproperty(mmodule, self)`
2298 fun lookup_first_definition
(mmodule
: MModule, mtype
: MType): MPROPDEF
2300 return lookup_all_definitions
(mmodule
, mtype
).first
2303 # Return all definitions in a linearization order
2304 # Most specific first, most general last
2306 # REQUIRE: `not mtype.need_anchor` to simplify the API (no `anchor` parameter)
2307 # REQUIRE: `mtype.has_mproperty(mmodule, self)`
2308 fun lookup_all_definitions
(mmodule
: MModule, mtype
: MType): Array[MPROPDEF]
2310 mtype
= mtype
.undecorate
2312 var cache
= self.lookup_all_definitions_cache
[mmodule
, mtype
]
2313 if cache
!= null then return cache
2315 assert not mtype
.need_anchor
2316 assert mtype
.has_mproperty
(mmodule
, self)
2318 #print "select prop {mproperty} for {mtype} in {self}"
2319 # First, select all candidates
2320 var candidates
= new Array[MPROPDEF]
2321 for mpropdef
in self.mpropdefs
do
2322 # If the definition is not imported by the module, then skip
2323 if not mmodule
.in_importation
<= mpropdef
.mclassdef
.mmodule
then continue
2324 # If the definition is not inherited by the type, then skip
2325 if not mtype
.is_subtype
(mmodule
, null, mpropdef
.mclassdef
.bound_mtype
) then continue
2327 candidates
.add
(mpropdef
)
2329 # Fast track for only one candidate
2330 if candidates
.length
<= 1 then
2331 self.lookup_all_definitions_cache
[mmodule
, mtype
] = candidates
2335 mmodule
.linearize_mpropdefs
(candidates
)
2336 candidates
= candidates
.reversed
2337 self.lookup_all_definitions_cache
[mmodule
, mtype
] = candidates
2341 private var lookup_all_definitions_cache
= new HashMap2[MModule, MType, Array[MPROPDEF]]
2343 redef var is_test
is lazy
do return intro
.is_test
2345 # Does self have the `before` annotation?
2346 var is_before
: Bool is lazy
do return intro
.is_before
2348 # Does self have the `before_all` annotation?
2349 var is_before_all
: Bool is lazy
do return intro
.is_before_all
2351 # Does self have the `after` annotation?
2352 var is_after
: Bool is lazy
do return intro
.is_after
2354 # Does self have the `after_all` annotation?
2355 var is_after_all
: Bool is lazy
do return intro
.is_after_all
2362 redef type MPROPDEF: MMethodDef
2364 # Is the property defined at the top_level of the module?
2365 # Currently such a property are stored in `Object`
2366 var is_toplevel
: Bool = false is writable
2368 # Is the property a constructor?
2369 # Warning, this property can be inherited by subclasses with or without being a constructor
2370 # therefore, you should use `is_init_for` the verify if the property is a legal constructor for a given class
2371 var is_init
: Bool = false is writable
2373 # The constructor is a (the) root init with empty signature but a set of initializers
2374 var is_root_init
: Bool = false is writable
2376 # Is the property a 'new' constructor?
2377 var is_new
: Bool = false is writable
2379 # Is the property a legal constructor for a given class?
2380 # As usual, visibility is not considered.
2381 # FIXME not implemented
2382 fun is_init_for
(mclass
: MClass): Bool
2387 # A specific method that is safe to call on null.
2388 # Currently, only `==`, `!=` and `is_same_instance` are safe
2389 fun is_null_safe
: Bool do return name
== "==" or name
== "!=" or name
== "is_same_instance"
2391 # Is this method a getter (auto or not)?
2394 fun is_getter
: Bool do return getter_for
!= null
2396 # The attribute this getter is for
2398 # Return `null` is this method is not a getter.
2399 var getter_for
: nullable MAttribute = null is writable
2401 # Is this method a setter (auto or not)?
2404 fun is_setter
: Bool do return setter_for
!= null
2406 # The attribute this setter is for
2408 # Return `null` is this method is not a setter.
2409 var setter_for
: nullable MAttribute = null is writable
2411 # Is this method a getter or a setter?
2412 fun is_accessor
: Bool do return is_getter
or is_setter
2415 # A global attribute
2419 redef type MPROPDEF: MAttributeDef
2421 # Does this attribute have a getter (auto or not)?
2424 fun has_getter
: Bool do return getter
!= null
2426 # The getter of this attribute (if any)
2427 var getter
: nullable MProperty = null is writable
2429 # Does this attribute have a setter (auto or not)?
2432 fun has_setter
: Bool do return setter
!= null
2434 # The setter of this attribute (if any)
2435 var setter
: nullable MProperty = null is writable
2438 # A global virtual type
2439 class MVirtualTypeProp
2442 redef type MPROPDEF: MVirtualTypeDef
2444 # The formal type associated to the virtual type property
2445 var mvirtualtype
= new MVirtualType(self)
2447 # Is `self` the special virtual type `SELF`?
2448 var is_selftype
: Bool is lazy
do return name
== "SELF"
2451 # A definition of a property (local property)
2453 # Unlike `MProperty`, a `MPropDef` is a local definition that belong to a
2454 # specific class definition (which belong to a specific module)
2455 abstract class MPropDef
2458 # The associated `MProperty` subclass.
2459 # the two specialization hierarchy are symmetric
2460 type MPROPERTY: MProperty
2463 type MPROPDEF: MPropDef
2465 # The class definition where the property definition is
2466 var mclassdef
: MClassDef
2468 # The associated global property
2469 var mproperty
: MPROPERTY
2473 redef fun visibility
do return mproperty
.visibility
2477 mclassdef
.mpropdefs
.add
(self)
2478 mproperty
.mpropdefs
.add
(self)
2479 mclassdef
.mpropdefs_by_property
[mproperty
] = self
2480 if mproperty
.intro_mclassdef
== mclassdef
then
2481 assert not isset mproperty
._intro
2482 mproperty
.intro
= self
2484 self.to_s
= "{mclassdef}${mproperty}"
2487 # Actually the name of the `mproperty`
2488 redef fun name
do return mproperty
.name
2490 # The full-name of mpropdefs combine the information about the `classdef` and the `mproperty`.
2492 # Therefore the combination of identifiers is awful,
2493 # the worst case being
2495 # * a property "p::m::A::x"
2496 # * redefined in a refinement of a class "q::n::B"
2497 # * in a module "r::o"
2498 # * so "r::o$q::n::B$p::m::A::x"
2500 # Fortunately, the full-name is simplified when entities are repeated.
2501 # For the previous case, the simplest form is "p$A$x".
2502 redef var full_name
is lazy
do
2503 var res
= new FlatBuffer
2505 # The first part is the mclassdef. Worst case is "r::o$q::n::B"
2506 res
.append mclassdef
.full_name
2510 if mclassdef
.mclass
== mproperty
.intro_mclassdef
.mclass
then
2511 # intro are unambiguous in a class
2514 # Just try to simplify each part
2515 if mclassdef
.mmodule
.mpackage
!= mproperty
.intro_mclassdef
.mmodule
.mpackage
then
2516 # precise "p::m" only if "p" != "r"
2517 res
.append mproperty
.intro_mclassdef
.mmodule
.namespace_for
(mproperty
.visibility
)
2519 else if mproperty
.visibility
<= private_visibility
then
2520 # Same package ("p"=="q"), but private visibility,
2521 # does the module part ("::m") need to be displayed
2522 if mclassdef
.mmodule
.namespace_for
(mclassdef
.mclass
.visibility
) != mproperty
.intro_mclassdef
.mmodule
.mpackage
then
2524 res
.append mproperty
.intro_mclassdef
.mmodule
.name
2528 # precise "B" because it is not the same class than "A"
2529 res
.append mproperty
.intro_mclassdef
.name
2531 # Always use the property name "x"
2532 res
.append mproperty
.name
2537 redef var c_name
is lazy
do
2538 var res
= new FlatBuffer
2539 res
.append mclassdef
.c_name
2541 if mclassdef
.mclass
== mproperty
.intro_mclassdef
.mclass
then
2542 res
.append name
.to_cmangle
2544 if mclassdef
.mmodule
!= mproperty
.intro_mclassdef
.mmodule
then
2545 res
.append mproperty
.intro_mclassdef
.mmodule
.c_name
2548 res
.append mproperty
.intro_mclassdef
.name
.to_cmangle
2550 res
.append mproperty
.name
.to_cmangle
2555 redef fun model
do return mclassdef
.model
2557 # Internal name combining the module, the class and the property
2558 # Example: "mymodule$MyClass$mymethod"
2559 redef var to_s
is noinit
2561 # Is self the definition that introduce the property?
2562 fun is_intro
: Bool do return isset mproperty
._intro
and mproperty
.intro
== self
2564 # Return the next definition in linearization of `mtype`.
2566 # This method is used to determine what method is called by a super.
2568 # REQUIRE: `not mtype.need_anchor`
2569 fun lookup_next_definition
(mmodule
: MModule, mtype
: MType): MPROPDEF
2571 assert not mtype
.need_anchor
2573 var mpropdefs
= self.mproperty
.lookup_all_definitions
(mmodule
, mtype
)
2574 var i
= mpropdefs
.iterator
2575 while i
.is_ok
and i
.item
!= self do i
.next
2576 assert has_property
: i
.is_ok
2578 assert has_next_property
: i
.is_ok
2582 redef fun mdoc_or_fallback
do return mdoc
or else mproperty
.mdoc_or_fallback
2584 # Does self have the `before` annotation?
2585 var is_before
= false is writable
2587 # Does self have the `before_all` annotation?
2588 var is_before_all
= false is writable
2590 # Does self have the `after` annotation?
2591 var is_after
= false is writable
2593 # Does self have the `after_all` annotation?
2594 var is_after_all
= false is writable
2597 # A local definition of a method
2601 redef type MPROPERTY: MMethod
2602 redef type MPROPDEF: MMethodDef
2604 # The signature attached to the property definition
2605 var msignature
: nullable MSignature = null is writable
2607 # The signature attached to the `new` call on a root-init
2608 # This is a concatenation of the signatures of the initializers
2610 # REQUIRE `mproperty.is_root_init == (new_msignature != null)`
2611 var new_msignature
: nullable MSignature = null is writable
2613 # List of initialisers to call in root-inits
2615 # They could be setters or attributes
2617 # REQUIRE `mproperty.is_root_init == (new_msignature != null)`
2618 var initializers
= new Array[MProperty]
2620 # Is the method definition abstract?
2621 var is_abstract
: Bool = false is writable
2623 # Is the method definition intern?
2624 var is_intern
= false is writable
2626 # Is the method definition extern?
2627 var is_extern
= false is writable
2629 # An optional constant value returned in functions.
2631 # Only some specific primitife value are accepted by engines.
2632 # Is used when there is no better implementation available.
2634 # Currently used only for the implementation of the `--define`
2635 # command-line option.
2636 # SEE: module `mixin`.
2637 var constant_value
: nullable Object = null is writable
2640 # A local definition of an attribute
2644 redef type MPROPERTY: MAttribute
2645 redef type MPROPDEF: MAttributeDef
2647 # The static type of the attribute
2648 var static_mtype
: nullable MType = null is writable
2651 # A local definition of a virtual type
2652 class MVirtualTypeDef
2655 redef type MPROPERTY: MVirtualTypeProp
2656 redef type MPROPDEF: MVirtualTypeDef
2658 # The bound of the virtual type
2659 var bound
: nullable MType = null is writable
2661 # Is the bound fixed?
2662 var is_fixed
= false is writable
2669 # * `interface_kind`
2673 # Note this class is basically an enum.
2674 # FIXME: use a real enum once user-defined enums are available
2678 # Can a class of kind `self` define a membership predicate?
2679 var can_customize_isa
: Bool
2681 # Can a class of kind `self` define a constructor?
2684 # Is a constructor required?
2687 # TODO: private init because enumeration.
2689 # Can a class of kind `self` specializes a class of kind `other`?
2690 fun can_specialize
(other
: MClassKind): Bool
2692 if other
== interface_kind
then
2693 # everybody can specialize interfaces
2695 else if self == interface_kind
or self == enum_kind
then
2696 # no other case for interfaces and enums
2698 else if self == subset_kind
then
2699 # A subset may specialize anything, except another subset.
2700 # TODO: Allow sub-subsets once we can handle them.
2701 return other
!= subset_kind
2702 else if self == extern_kind
then
2703 # only compatible with themselves
2704 return self == other
2706 # assert self == abstract_kind or self == concrete_kind
2707 return other
== abstract_kind
or other
== concrete_kind
2712 # The class kind `abstract`
2713 fun abstract_kind
: MClassKind do return once
new MClassKind("abstract class", false, true, true)
2714 # The class kind `concrete`
2715 fun concrete_kind
: MClassKind do return once
new MClassKind("class", false, true, true)
2716 # The class kind `interface`
2717 fun interface_kind
: MClassKind do return once
new MClassKind("interface", false, true, false)
2718 # The class kind `enum`
2719 fun enum_kind
: MClassKind do return once
new MClassKind("enum", false, true, false)
2720 # The class kind `extern`
2721 fun extern_kind
: MClassKind do return once
new MClassKind("extern class", false, true, false)
2722 # The class kind `subset`
2723 fun subset_kind
: MClassKind do return once
new MClassKind("subset", true, false, false)
2725 # A standalone pre-constructed model used to test various model-related methods.
2727 # When instantiated, a standalone model is already filled with entities that are exposed as attributes.
2728 class ModelStandalone
2731 redef var location
= new Location.opaque_file
("ModelStandalone")
2734 var mmodule0
= new MModule(self, null, "module0", location
)
2736 # The root Object class
2737 var mclass_o
= new MClass(mmodule0
, "Object", location
, null, interface_kind
, public_visibility
)
2739 # The introduction of `mclass_o`
2740 var mclassdef_o
= new MClassDef(mmodule0
, mclass_o
.mclass_type
, location
)
2743 # A standalone model with the common class diamond-hierarchy ABCD
2745 super ModelStandalone
2747 # A, a simple subclass of Object
2748 var mclass_a
= new MClass(mmodule0
, "A", location
, null, concrete_kind
, public_visibility
)
2750 # The introduction of `mclass_a`
2751 var mclassdef_a
: MClassDef do
2752 var res
= new MClassDef(mmodule0
, mclass_a
.mclass_type
, location
)
2753 res
.set_supertypes
([mclass_o
.mclass_type
])
2754 res
.add_in_hierarchy
2758 # B, a subclass of A (`mclass_a`)
2759 var mclass_b
= new MClass(mmodule0
, "B", location
, null, concrete_kind
, public_visibility
)
2761 # The introduction of `mclass_b`
2762 var mclassdef_b
: MClassDef do
2763 var res
= new MClassDef(mmodule0
, mclass_b
.mclass_type
, location
)
2764 res
.set_supertypes
([mclass_a
.mclass_type
])
2765 res
.add_in_hierarchy
2769 # C, another subclass of A (`mclass_a`)
2770 var mclass_c
= new MClass(mmodule0
, "C", location
, null, concrete_kind
, public_visibility
)
2772 # The introduction of `mclass_c`
2773 var mclassdef_c
: MClassDef do
2774 var res
= new MClassDef(mmodule0
, mclass_c
.mclass_type
, location
)
2775 res
.set_supertypes
([mclass_a
.mclass_type
])
2776 res
.add_in_hierarchy
2780 # D, a multiple subclass of B (`mclass_b`) and C (`mclass_c`)
2781 var mclass_d
= new MClass(mmodule0
, "D", location
, null, concrete_kind
, public_visibility
)
2783 # The introduction of `mclass_d`
2784 var mclassdef_d
: MClassDef do
2785 var res
= new MClassDef(mmodule0
, mclass_d
.mclass_type
, location
)
2786 res
.set_supertypes
([mclass_b
.mclass_type
, mclass_c
.mclass_type
])
2787 res
.add_in_hierarchy