1. - $-
ý

2. .è
F
$
S
.

3. S .
●
S
– . .
. .
–
●
ID
–
–
S

4. .
●
– . . ..... .
– .
●
(CFG)
–
●
(LR )
–8 .
(LL )
–9 .

5. .
●
– _ .è
●
.è
● .
● _

6. S
.
S
(1/3)
●
S
– ... .
● lex.flex.jflex (etc...)
– . . ......
!

7. S
.
S
(2/3)
lex!.
●
1.:^,!!!!!!|!qsjoug)#OVNCFSquot;quot;]o#*!~
!]u]o^,!!!!|!0+!ep!opuijoh!+0!~
/,!!!!!!!!!!|!qsjoug)#PUIFSquot;quot;]o#*!~
jou!nbjo)*!|
!!!!xijmf)zzmfy)*!quot;!1*!|
!!!!~
!!!!sfuvso!1
~

8. S
.
S
(3/3)
●
%!gmfy!mfy2/m
%!hdd!mfy/zz/d!.mgm
%!/0b/pvu
4
OVNCFSquot;quot;
54
OVNCFSquot;quot;
iphf
PUIFSquot;quot;

9. .
(1/4)
●
– ... .
● yacc.bison.CUP.JavaCC.racc (etc...)
–
S
. . . .
è

10. .
(2/4)
yacc!.
●
uplfo!OVNCFS
uplfo!QMVT
T!!!!!!!;!F!|!qsjoug)#sftvmu!;!e]o#-!%2*!~
!!!!!!!!
F!!!!!!!;!F!QMVT!F!|!%%!!%2!,!%4!~
!!!!!!!!}!OVNCFS!|!%%!!%2!~
!!!!!!!!
$jodmvef!#mfy/zz/d#
jou!nbjo)*!|
!!!!zzqbstf)*
~

11. .
(3/4)
lex!.
●
#,#!!!!!|!sfuvso!QMVT!~
]u]o!^!|!0+!ep!opuijoh!+0!~
1.:^,!!|
!!!!!!!!ttdbog)zzufyu-!#e#-!'zzmwbm*
!!!!!!!!sfuvso!OVNCFS
~
/!!!!!!!|
!!!!!!!!qsjoug)#cbe!joqvu!dibsbdufsquot;quot;]o#*
!!!!!!!!qsjoug)#jhopsfequot;quot;]o#*
~

12. .
(4/4)
●
%!gmfy!zbdd3/m
%!cjtpo!zbdd3/z
zbdd3/z;!dpogmjdut;!2!tijgu0sfevdf
%!hdd!zbdd3/ubc/d!.mz!.mgm
%!/0b/pvu
4!,!6!,!6
sftvmu!;!24

13. Shift / Reduce Conflict (1/4)
Shift / Reduce Conflict
●
– . `... .. ....
.. (.... .)
–

14. Shift / Reduce Conflict (2/4)
.1 + 2 + 3.. -1
● .
S
E
E PLUS E
NUMBER
E PLUS E
NUMBER NUMBER

15. Shift / Reduce Conflict (3/4)
.1 + 2 + 3.. -2
● .
S
E
E PLUS E
NUMBER E PLUS E
NUMBER NUMBER

16. Shift / Reduce Conflict (4/4)
● .. ..( ) ..
● !. .Ä.. .

17. (1/3)
..
(lex!)
● .. . .
#,#!!!!!|!sfuvso!QMVT!~
#.#!!!!!|!sfuvso!NJOVT!~
#+#!!!!!|!sfuvso!NVMU!~
#0#!!!!!|!sfuvso!NVMU!~

18. (2/3)
..
(yacc!)
● .. . .
T!!!!!!!;!F!|!qsjoug)#sftvmu!;!e]o#-!%2*!~
!!!!!!!!
F!!!!!!!;!F!QMVT!F!|!%%!!%2!,!%4!~
!!!!!!!!}!F!NJOVT!F!|!%%!!%2!.!%4!~
!!!!!!!!}!F!NVMU!F!|!%%!!%2!+!%4!~
!!!!!!!!}!F!EJW!F!|!%%!!%2!0!%4!~
!!!!!!!!}!OVNCFS.|!%%!!%2!~
!!!!!!!!

19. (3/3)
..
●
%!gmfy!zbdd4/m
%!cjtpo!zbdd4/z
zbdd4/z;!dpogmjdut;!27!tijgu0sfevdf
%!hdd!zbdd4/ubc/d!.mz!.mgm
%!/0b/pvu
4! !4!+!3
sftvmu!;!.4
%!/0!b/pvu
!!. !!
4!+!4! !3
sftvmu!;!4

20. (1/ )
...
(yacc!)
● ... .. 
T!!!!!!!;!F!|!qsjoug)#sftvmu!;!e]o#-!%2*!~
!!!!!!!!
F!!!!!!!;!F!QMVT!U!|!%%!!%2!,!%4!~
!!!!!!!!}!F!NJOVT!U!|!%%!!%2!.!%4!~
!!!!!!!!}!U!|!%%!!%2!~
!!!!!!!!
U!!!!!!!;!U!NVMU!G!|!%%!!%2!+!%4!~
!!!!!!!!}!U!EJW!G!|!%%!!%2!0!%4!~
!!!!!!!!}!G!|!%%!!%2!~
!!!!!!!!
G!!!!!!!;!MQBS!F!SQBS!|!%%!!%3!~
!!!!!!!!}!OVNCFS!|!%%!!%2!~
!!!!!!!!

21. (2/2)
...
●
%!gmfy!zbdd5/m
%!cjtpo!zbdd5/z
%!hdd!zbdd5/ubc/d!.mz!.mgm
%!/0b/pvu
4! !4!+!3
sftvmu!;!.4
%!/0!b/pvu
GOOD!!
4!+!4! !3
sftvmu!;!8

22. .$. .

23. .$. .

24. ..=....

25. ....
/ / (. )
●
S
Shift / Reduce Conflict
●
Yacc / Lex .3
●
● ..
● ...
●
C

26. .......
● è
●
9 . .8 .
● .
– F$
–
–
●
.. ....

27. ..