43 lines
552 B
Python
43 lines
552 B
Python
|
# lex_state2.py
|
||
|
|
#
|
||
|
|
# Bad state declaration
|
||
|
|
|
||
|
|
import sys
|
||
|
|
sys.path.insert(0,"..")
|
||
|
|
|
||
|
|
import ply.lex as lex
|
||
|
|
|
||
|
|
tokens = [
|
||
|
|
"PLUS",
|
||
|
|
"MINUS",
|
||
|
|
"NUMBER",
|
||
|
|
]
|
||
|
|
|
||
|
|
comment = 1
|
||
|
|
states = (('comment', 'exclusive'),
|
||
|
|
('comment', 'exclusive'))
|
||
|
|
|
||
|
|
t_PLUS = r'\+'
|
||
|
|
t_MINUS = r'-'
|
||
|
|
t_NUMBER = r'\d+'
|
||
|
|
|
||
|
|
# Comments
|
||
|
|
def t_comment(t):
|
||
|
|
r'/\*'
|
||
|
|
t.lexer.begin('comment')
|
||
|
|
print "Entering comment state"
|
||
|
|
|
||
|
|
def t_comment_body_part(t):
|
||
|
|
r'(.|\n)*\*/'
|
||
|
|
print "comment body", t
|
||
|
|
t.lexer.begin('INITIAL')
|
||
|
|
|
||
|
|
def t_error(t):
|
||
|
|
pass
|
||
|
|
|
||
|
|
import sys
|
||
|
|
|
||
|
|
lex.lex()
|
||
|
|
|
||
|
|
|