Java Reference
In-Depth Information
class
NodeVisitor
procedure
visit
(
n
)
foreach
c
∈
n
.
getChildren()
do call
c
.
accept(
this
)
C
hildren
end
end
class
SemanticsVisitor
extends
NodeVisitor
procedure
(
c
)
if
c
.
type
Boolean
and
c
.
type
errorType
then call
check
B
oolean
1
error
(”
Require Boolean type at
”
,
c
)
end
procedure
visit
( IfTesting
ifn
)
2
call
visit
C
hildren
(
ifn
)
call
check
B
oolean
(
ifn
.
condition
)
end
procedure
visit
(WhileLooping
wn
)
3
call
visit
C
hildren
(
wn
)
call
check
B
oolean
(
wn
.
condition
)
end
procedure
visit
(DoWhileLooping
dwn
)
4
call
visit
C
hildren
(
dwn
)
call
check
B
oolean
(
dwn
.
condition
)
end
procedure
visit
(ForLooping
fn
)
5
call
open
S
cope
()
call
visit
C
hildren
(
fn
)
if
fn
.
condition
null
then call
check
B
oolean
(
fn
.
condition
)
call
close
S
cope
()
end
procedure
visit
( LabeledStmt
ls
)
/
Figure 9.11 on page 357
/
end
procedure
visit
(Continuing
cn
)
/
Figure 9.12 on page 358
/
end
procedure
visit
(Breaking
bn
)
/
Figure 9.15 on page 360
/
end
procedure
visit
(Returning
rn
)
/
Figure 9.18 on page 362
/
end
end
Figure 9.1: Semantic Analysis Visitors (Part 1)
