# Abort if the instance is not a boolean value.
fun is_true: Bool do abort
+ # Return `true` if the instance is null.
+ # Return `false` otherwise.
+ fun is_null: Bool do return mtype isa MNullType
+
# Return true if `self` IS `o` (using the Nit semantic of is)
fun eq_is(o: Instance): Bool do return self.is_same_instance(o)
else if mpropdef == mwritepropdef then
assert args.length == 2
var arg = args[1]
- if is_optional and arg.mtype isa MNullType then
+ if is_optional and arg.is_null then
var f = v.new_frame(self, mpropdef, args)
arg = evaluate_expr(v, recv, f)
end
for g in n_groups do
var col = v.expr(g.n_expr)
if col == null then return
- if col.mtype isa MNullType then fatal(v, "Receiver is null")
+ if col.is_null then fatal(v, "Receiver is null")
var iter = v.callsite(g.method_iterator, [col]).as(not null)
iters.add iter
redef class ACharExpr
redef fun expr(v)
do
- if is_ascii then return v.int_instance(self.value.as(not null).ascii)
- if is_code_point then return v.int_instance(self.value.as(not null).code_point)
+ if is_code_point then
+ return v.int_instance(self.value.as(not null).code_point)
+ end
return v.char_instance(self.value.as(not null))
end
end
do
var i = v.expr(self.n_expr)
if i == null then return null
- if i.mtype isa MNullType then
+ if i.is_null then
fatal(v, "Cast failed")
end
return i
do
var recv = v.expr(self.n_expr)
if recv == null then return null
+
+ # Safe call shortcut if recv is null
+ if is_safe and recv.is_null then
+ return recv
+ end
+
var args = v.varargize(callsite.mpropdef, callsite.signaturemap, recv, self.raw_arguments)
if args == null then return null
do
var recv = v.expr(self.n_expr)
if recv == null then return null
- if recv.mtype isa MNullType then fatal(v, "Receiver is null")
+ if recv.is_null then fatal(v, "Receiver is null")
var mproperty = self.mproperty.as(not null)
return v.read_attribute(mproperty, recv)
end
do
var recv = v.expr(self.n_expr)
if recv == null then return
- if recv.mtype isa MNullType then fatal(v, "Receiver is null")
+ if recv.is_null then fatal(v, "Receiver is null")
var i = v.expr(self.n_value)
if i == null then return
var mproperty = self.mproperty.as(not null)
do
var recv = v.expr(self.n_expr)
if recv == null then return
- if recv.mtype isa MNullType then fatal(v, "Receiver is null")
+ if recv.is_null then fatal(v, "Receiver is null")
var value = v.expr(self.n_value)
if value == null then return
var mproperty = self.mproperty.as(not null)
do
var recv = v.expr(self.n_expr)
if recv == null then return null
- if recv.mtype isa MNullType then fatal(v, "Receiver is null")
+ if recv.is_null then fatal(v, "Receiver is null")
var mproperty = self.mproperty.as(not null)
return v.bool_instance(v.isset_attribute(mproperty, recv))
end
end
end
+redef class ASafeExpr
+ redef fun expr(v)
+ do
+ return v.expr(self.n_expr)
+ end
+end
+
redef class ANamedargExpr
redef fun expr(v)
do