Java Reference
In-Depth Information
/
Visitor code for Marker
19
on page 302
/
procedure
visit
(EnumDefining
enumde f
)
typeRe f
←
new
TypeDescriptor(
enumType
)
45
nextval
←
0
foreach
id
∈
enumde f
.
constantNames
do
46
if
currentSymbolTable
.
declaredLocally(
id
.
name
)
then
call
47
error
(”
Name cannot be redeclared
:”
,
id
.
name
)
id
.
type
←
errorType
id
.
attributesRe f
←
null
else
attr
←
new
Attributes(
enumAttributes
)
attr
.
enumType
←
typeRe f
attr
.
myValue
←
nextval
nextval
←
nextval
+
48
1
call
currentSymbolTable
.
enterSymbol(
id
.
name
,
attr
)
id
.
type
←
typeRe f
id
.
attributesRe f
←
attr
call
typeRe f
.
appendToConstList(
id
.
name
,
attr
)
49
enumde f
.
type
←
typeRe f
50
end
Figure 8.23:
visit
method in TypeVisitor for EnumDefining.
EnumDefining
type
constantNames
IdentifierList
. . .
Identifier
Identifier
ids
Figure 8.24: Abstract Syntax Tree for an Enumeration Type
