# Visit the expressions of args and check their conformity with the corresponding type in signature
# The point of this method is to handle varargs correctly
# Note: The signature must be correctly adapted
- fun check_signature(node: ANode, args: Array[AExpr], mproperty: MProperty, msignature: MSignature): Bool
+ fun check_signature(node: ANode, args: Array[AExpr], mproperty: MProperty, msignature: MSignature): nullable SignatureMap
do
var vararg_rank = msignature.vararg_rank
if vararg_rank >= 0 then
if args.length < msignature.arity then
modelbuilder.error(node, "Error: expected at least {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
- return false
+ return null
end
else if args.length != msignature.arity then
- modelbuilder.error(node, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
- return false
+ if msignature.arity == msignature.min_arity then
+ modelbuilder.error(node, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
+ return null
+ end
+ if args.length > msignature.arity then
+ modelbuilder.error(node, "Error: expected at most {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
+ return null
+ end
+ if args.length < msignature.min_arity then
+ modelbuilder.error(node, "Error: expected at least {msignature.min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
+ return null
+ end
end
#debug("CALL {unsafe_type}.{msignature}")
+ # Associate each parameter to a position in the arguments
+ var map = new SignatureMap
+
+ var setted = args.length - msignature.min_arity
+
+ # First, handle named arguments
+ for i in [0..args.length[ do
+ var e = args[i]
+ if not e isa ANamedargExpr then continue
+ var name = e.n_id.text
+ var param = msignature.mparameter_by_name(name)
+ if param == null then
+ modelbuilder.error(e.n_id, "Error: no parameter `{name}` for `{mproperty}{msignature}`.")
+ return null
+ end
+ if not param.is_default then
+ modelbuilder.error(e, "Error: parameter `{name}` is not optional for `{mproperty}{msignature}`.")
+ return null
+ end
+ var idx = msignature.mparameters.index_of(param)
+ var prev = map.map.get_or_null(idx)
+ if prev != null then
+ modelbuilder.error(e, "Error: parameter `{name}` already associated with argument #{prev} for `{mproperty}{msignature}`.")
+ return null
+ end
+ map.map[idx] = i
+ setted -= 1
+ e.mtype = self.visit_expr_subtype(e.n_expr, param.mtype)
+ end
+
+ # Second, associate remaining parameters
var vararg_decl = args.length - msignature.arity
+ var j = 0
for i in [0..msignature.arity[ do
- var j = i
- if i == vararg_rank then continue # skip the vararg
- if i > vararg_rank then
- j = i + vararg_decl
+ # Skip parameters associated by name
+ if map.map.has_key(i) then continue
+
+ var param = msignature.mparameters[i]
+ if param.is_default then
+ if setted > 0 then
+ setted -= 1
+ else
+ continue
+ end
end
- var paramtype = msignature.mparameters[i].mtype
- self.visit_expr_subtype(args[j], paramtype)
+
+ # Search the next free argument: skip named arguments since they are already associated
+ while args[j] isa ANamedargExpr do j += 1
+ var arg = args[j]
+ map.map[i] = j
+ j += 1
+
+ if i == vararg_rank then
+ j += vararg_decl
+ continue # skip the vararg
+ end
+
+ var paramtype = param.mtype
+ self.visit_expr_subtype(arg, paramtype)
end
+
+ # Third, check varargs
if vararg_rank >= 0 then
var paramtype = msignature.mparameters[vararg_rank].mtype
var first = args[vararg_rank]
- if vararg_decl == 0 and first isa AVarargExpr then
+ if vararg_decl == 0 then
var mclass = get_mclass(node, "Array")
- if mclass == null then return false # Forward error
+ if mclass == null then return null # Forward error
var array_mtype = mclass.get_mtype([paramtype])
- self.visit_expr_subtype(first.n_expr, array_mtype)
- first.mtype = first.n_expr.mtype
+ if first isa AVarargExpr then
+ self.visit_expr_subtype(first.n_expr, array_mtype)
+ first.mtype = first.n_expr.mtype
+ else
+ # only one vararg, maybe `...` was forgot, so be gentle!
+ var t = visit_expr(first)
+ if t == null then return null # Forward error
+ if not is_subtype(t, paramtype) and is_subtype(t, array_mtype) then
+ # Not acceptable but could be a `...`
+ error(first, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
+ return null
+ end
+ # Standard valid vararg, finish the job
+ map.vararg_decl = 1
+ self.visit_expr_subtype(first, paramtype)
+ end
else
- for j in [vararg_rank..vararg_rank+vararg_decl] do
- self.visit_expr_subtype(args[j], paramtype)
+ map.vararg_decl = vararg_decl + 1
+ for i in [vararg_rank..vararg_rank+vararg_decl] do
+ self.visit_expr_subtype(args[i], paramtype)
end
end
end
- return true
+
+ return map
end
fun error(node: ANode, message: String)
end
end
+# Mapping between parameters and arguments in a call.
+#
+# Parameters and arguments are not stored in the class but referenced by their position (starting from 0)
+#
+# The point of this class is to help engine and other things to map arguments in the AST to parameters of the model.
+class SignatureMap
+ # Associate a parameter to an argument
+ var map = new ArrayMap[Int, Int]
+
+ # The length of the vararg sequence
+ # 0 if no vararg or if reverse vararg (cf `AVarargExpr`)
+ var vararg_decl: Int = 0
+end
+
# A specific method call site with its associated informations.
class CallSite
# The associated node for location
# Is a implicit cast required on erasure typing policy?
var erasure_cast: Bool
+ # The mapping used on the call to associate arguments to parameters
+ # If null then no specific association is required.
+ var signaturemap: nullable SignatureMap = null
+
private fun check_signature(v: TypeVisitor, args: Array[AExpr]): Bool
do
- return v.check_signature(self.node, args, self.mproperty, self.msignature)
+ var map = v.check_signature(self.node, args, self.mproperty, self.msignature)
+ signaturemap = map
+ return map == null
end
end
redef class Variable
# The declared type of the variable
- var declared_type: nullable MType
+ var declared_type: nullable MType is writable
# Was the variable type-adapted?
# This is used to speedup type retrieval while it remains `false`
end
end
-redef class AUplusExpr
- redef fun property_name do return "unary +"
- redef fun compute_raw_arguments do return new Array[AExpr]
-end
-
-redef class AUminusExpr
- redef fun property_name do return "unary -"
+redef class AUnaryopExpr
+ redef fun property_name do return "unary {operator}"
redef fun compute_raw_arguments do return new Array[AExpr]
end
msignature = v.resolve_for(msignature, recvtype, true).as(MSignature)
var args = self.n_args.to_a
if args.length > 0 then
- v.check_signature(self, args, mproperty, msignature)
+ signaturemap = v.check_signature(self, args, mproperty, msignature)
end
self.mtype = msignature.return_mtype
self.is_typed = true
mpropdef = v.mpropdef.as(MMethodDef)
end
+ # The mapping used on the call to associate arguments to parameters.
+ # If null then no specific association is required.
+ var signaturemap: nullable SignatureMap
+
private fun process_superinit(v: TypeVisitor)
do
var anchor = v.anchor
nitlanguage / nit.git / blobdiff