redef class MMLocalClass
# Cached result of get_type
- attr _base_type_cache: MMType
+ attr _base_type_cache: nullable MMType
# Return the type of self for this class
meth get_type: MMType
do
if _base_type_cache == null then _base_type_cache = new MMTypeSimpleClass(self)
- return _base_type_cache
+ return _base_type_cache.as(not null)
end
# Register a new ancestor
end
# Array of ancestor that associate each superclass with the corresponding ancestor
- readable attr _ancestors: Map[MMLocalClass, MMAncestor]
+ readable attr _ancestors: nullable Map[MMLocalClass, MMAncestor]
# The ancestor type for a given superclass
meth ancestor(c: MMLocalClass): MMType
do
- assert _ancestors != null
- if _ancestors.has_key(c) then
- return _ancestors[c].stype
- end
- return null
+ return _ancestors[c].stype
end
end
redef class MMLocalProperty
# The signature of the property (where it is declared)
- readable writable attr _signature: MMSignature
+ readable writable attr _signature: nullable MMSignature
attr _signatures_cache: HashMap[MMType, MMSignature] = new HashMap[MMType, MMSignature]
# Return the adapted signature of self for a receiver of type t
meth signature_for(t: MMType): MMSignature do
- if t == local_class.get_type then return signature
+ if t == local_class.get_type then return signature.as(not null)
if _signatures_cache.has_key(t) then return _signatures_cache[t]
# Signature for local properties
class MMSignature
# The type of the reveiver
- readable attr _recv: MMType
+ readable attr _recv: MMType
# The parameter types
- attr _params: Array[MMType]
+ attr _params: Array[MMType]
# The return type
- readable attr _return_type: MMType
+ readable attr _return_type: nullable MMType
+
+ # The closure parameters
+ readable attr _closures: Array[MMClosure] = new Array[MMClosure]
# Number of parameters
meth arity: Int
do
- assert _params != null
return _params.length
end
# Is self a valid subtype of an other signature
meth <(s: MMSignature): Bool
do
- assert s != null
if self == s then
return true
end
assert _recv.module == s.recv.module
- if arity != s.arity or (_return_type == null) != (s.return_type == null) then return false
- if _return_type != null and not _return_type < s.return_type then
+ var rt = _return_type
+ var srt = s.return_type
+ if arity != s.arity or (rt == null) != (srt == null) then return false
+ if rt != null and not rt < srt.as(not null) then
return false
end
return false
end
end
+
+ if closures.length != s.closures.length then return false
+ for i in [0..closures.length[ do
+ if not s.closures[i] < closures[i] then return false
+ end
return true
end
redef meth to_s
do
- var s: String
- if _params != null and _params.length > 0 then
+ var s = new Buffer
+ if _params.length > 0 then
var tmp: String
var a = new Array[String].with_capacity(_params.length)
for i in [0.._params.length[ do
#a.add("{pn}: {p}")
a.add(p.to_s)
end
- s = "({a.join(",")})"
- else
- s = ""
+ s.append("({a.join(",")})")
end
if _return_type != null then
s.append(": {_return_type}")
end
- return s
+ return s.to_s
end
# Adapt the signature to a different receiver
return self
end
var mod = r.module
- var p = _params
- if p != null then
- p = new Array[MMType]
- for i in _params do
- p.add(i.for_module(mod).adapt_to(r))
- end
+ var p = new Array[MMType]
+ for i in _params do
+ p.add(i.for_module(mod).adapt_to(r))
end
var rv = _return_type
if rv != null then
rv = rv.for_module(mod).adapt_to(r)
end
- return new MMSignature(p,rv,r)
+ var res = new MMSignature(p,rv,r)
+ for clos in _closures do
+ res.closures.add(clos.adaptation_to(r))
+ end
+ return res
end
- attr _not_for_self_cache: MMSignature
+ attr _not_for_self_cache: nullable MMSignature = null
# Return a type approximation if the reveiver is not self
# Useful for virtual types
meth not_for_self: MMSignature
do
- var res = _not_for_self_cache
- if res != null then return res
+ if _not_for_self_cache != null then return _not_for_self_cache.as(not null)
var need_for_self = false
- var p = _params
- if p != null then
- p = new Array[MMType]
- for i in _params do
- var i2 = i.not_for_self
- if i != i2 then need_for_self = true
- p.add(i.not_for_self)
- end
+ var p = new Array[MMType]
+ for i in _params do
+ var i2 = i.not_for_self
+ if i != i2 then need_for_self = true
+ p.add(i2)
end
-
+
var rv = _return_type
if rv != null then
- var rv = rv.not_for_self
+ rv = rv.not_for_self
if rv != _return_type then need_for_self = true
end
+ var clos = new Array[MMClosure]
+ for c in _closures do
+ var c2 = c.not_for_self
+ if c2 != c then need_for_self = true
+ clos.add(c2)
+ end
+
+ var res: MMSignature
if need_for_self then
res = new MMSignature(p, rv, _recv)
+ res.closures.add_all(clos)
else
res = self
end
return res
end
- init(params: Array[MMType], return_type: MMType, r: MMType)
+ init(params: Array[MMType], return_type: nullable MMType, r: MMType)
do
- assert params != null
_params = params
_return_type = return_type
_recv = r
end
end
+# A closure in a signature
+class MMClosure
+ # The signature of the closure
+ readable attr _signature: MMSignature
+
+ # Is the closure a brek one
+ # aka is defined with the break keyword thus does not return
+ readable attr _is_break: Bool
+
+ # Is the closure optional?
+ # ie is there a default definition
+ readable attr _is_optional: Bool
+
+ # Adapt the signature to a different receiver
+ meth adaptation_to(r: MMType): MMClosure
+ do
+ return new MMClosure(_signature.adaptation_to(r), _is_break, _is_optional)
+ end
+
+ init(s: MMSignature, is_break: Bool, is_optional: Bool)
+ do
+ _signature = s
+ _is_break = is_break
+ _is_optional = is_optional
+ end
+
+ meth not_for_self: MMClosure
+ do
+ var sig = _signature.not_for_self
+ if sig != _signature then
+ return new MMClosure(sig, _is_break, _is_optional)
+ else
+ return self
+ end
+ end
+
+ meth <(c: MMClosure): Bool
+ do
+ if c.is_optional and not is_optional then return false
+ if not c.is_break and is_break then return false
+ return c.signature < signature
+ end
+end
+
# Inheritance relation between two types
abstract class MMAncestor
# The inherited type
- readable writable attr _stype: MMType
+ writable attr _stype: nullable MMType = null
+
+ # The inherited type
+ meth stype: MMType do return _stype.as(not null)
+
+ # The inheriter (heir) type
+ writable attr _inheriter: nullable MMType = null
# The inheriter (heir) type
- readable writable attr _inheriter: MMType
+ meth inheriter: MMType do return _inheriter.as(not null)
meth is_reffinement: Bool do
return stype.module != stype.module
redef meth to_s
do
- if stype == null then
+ if _stype == null then
return local_class.to_s
else
return stype.to_s
# The local class that self direclty or indirectly refers to
meth local_class: MMLocalClass is abstract
+ # Is the type a valid one
+ # For instance, circular dependency on formal types is invalid
+ meth is_valid: Bool do return true
+
# Is self a valid subtype of t
meth <(t : MMType): Bool is abstract
# Adapt self to another local class context
# Useful for genericity
+ # 'c' Must be a super-class of self
+ # Example:
+ # class A[E]
+ # class B[F] special A[F]
+ # class C[G] special B[String]
+ # class D special C[Float]
+ # 'A[Int]'.upcast_for('A') -> 'A[Int]'
+ # 'A[Int]'.upcast_for('B') -> abort
+ # 'B[Int]'.upcast_for('B') -> 'B[Int]'
+ # 'B[Int]'.upcast_for('A') -> 'A[Int]'
+ # 'B[Int]'.upcast_for('C') -> abort
+ # 'C[Int]'.upcast_for('C') -> 'C[Int]'
+ # 'C[Int]'.upcast_for('B') -> 'B[String]'
+ # 'C[Int]'.upcast_for('A') -> 'A[String]'
+ # 'D'.upcast_for('D') -> 'D'
+ # 'D'.upcast_for('C') -> 'C[Float]'
+ # 'D'.upcast_for('B') -> 'C[String]'
+ # 'D'.upcast_for('A') -> 'A[String]'
meth upcast_for(c: MMLocalClass): MMType is abstract
# Return a type approximation if the reveiver is not self
# Useful for virtual types
meth not_for_self: MMType do return self
+
+ # The nullable version of self (if needed)
+ attr _as_nullable_cache: nullable MMType = null
+
+ # IS the type can accept null?
+ meth is_nullable: Bool do return false
+
+ # Return the nullable version of the type
+ # Noop if already nullable
+ meth as_nullable: MMType do
+ var cache = _as_nullable_cache
+ if cache != null then return cache
+ var res = new MMNullableType(self)
+ _as_nullable_cache = res
+ return res
+ end
+
+ # Return the not null version of the type
+ # Noop if already not null
+ meth as_notnull: MMType do return self
+end
+
+class MMNullableType
+special MMType
+ attr _base_type: MMType
+ redef meth is_valid do return _base_type.is_valid
+ redef meth is_nullable: Bool do return true
+ redef meth as_notnull do return _base_type
+ redef meth as_nullable do return self
+ init(t: MMType) do _base_type = t
+
+ redef meth module do return _base_type.module
+
+ redef meth local_class do return _base_type.local_class
+
+ redef meth <(t)
+ do
+ return t isa MMNullableType and _base_type < t.as_notnull
+ end
+
+ redef meth to_s
+ do
+ return "nullable {_base_type}"
+ end
+
+ redef meth is_supertype(t)
+ do
+ return _base_type.is_supertype(t)
+ end
+
+ redef meth for_module(mod)
+ do
+ return _base_type.for_module(mod).as_nullable
+ end
+
+ redef meth adapt_to(recv)
+ do
+ return _base_type.adapt_to(recv).as_nullable
+ end
+
+ redef meth upcast_for(c)
+ do
+ return _base_type.upcast_for(c)
+ end
+
+ redef meth not_for_self
+ do
+ return _base_type.not_for_self.as_nullable
+ end
end
class MMTypeClass
special MMType
redef readable attr _local_class: MMLocalClass
redef meth module do return _local_class.module end
- redef meth <(t) do return t != null and t.is_supertype(self)
+ redef meth <(t) do return t.is_supertype(self)
redef meth to_s
do
redef meth upcast_for(c)
do
- assert _local_class != null
- assert c != null
-
var t: MMType = self
if _local_class != c then
t = _local_class.ancestor(c)
end
- assert t != null
return t
end
if module != mod then
t = _local_class.for_module(mod).get_type
end
- assert t != null
return t
end
# The type of null
class MMTypeNone
special MMType
- redef readable attr _module: MMModule
- redef meth <(t) do return true
- redef meth is_supertype(t) do return false
- redef meth local_class do abort
- redef meth upcast_for(c) do return self
+ redef readable attr _module: MMModule
+ redef meth is_nullable: Bool do return true
+ redef meth <(t) do return t isa MMTypeNone or t isa MMNullableType
+ redef meth to_s do return "null"
+ redef meth is_supertype(t) do return false
+ redef meth local_class do abort
+ redef meth upcast_for(c) do abort
+ redef meth as_nullable do return self
+ redef meth as_notnull do abort
private init(m: MMModule) do _module = m
end
nitlanguage / nit.git / blobdiff