Java Reference
In-Depth Information
procedure
LL
parser
(
ts
)
call
(S)
accepted
←
push
false
while not
accepted
do
5
if
TOS( )
∈Σ
6
then
call
match
(
ts
,
TOS( ) )
7
if
TOS( )
=
$
8
then
accepted
←
true
call
pop
()
9
else
,
ts
.
peek()]
p
←
LLtable
[TOS( )
10
if
p
=
0
then
call
error
( Syntax error—no production applicable )
else call
apply
(
p
)
end
procedure
apply
(
p
: A
→X
...X
m
)
1
call
pop
()
11
for
i
=
m
downto
1
do
call
12
push
(
X
i
)
end
Figure 5.8: Generic LL(1) parser.
procedure
F
ill
T
able
(
LLtable
)
foreach
A
∈
N
do
foreach
a
∈Σ
do
LLtable
[A][a]
←
0
foreach
A
∈
N
do
foreach
p
∈
ProductionsFor
(A)
do
foreach
a
∈
Predict(
p
)
do
LLtable
[A][a]
←
p
end
Figure 5.9: Construction of an LL(1) parse table.
