lex_state_try.py revision 4479 
1# lex_state2.py
2#
3# Declaration of a state for which no rules are defined
4
5import sys
6sys.path.insert(0,"..")
7
8import ply.lex as lex
9
10tokens = [
11    "PLUS",
12    "MINUS",
13    "NUMBER",
14    ]
15
16comment = 1
17states = (('comment', 'exclusive'),)
18
19t_PLUS = r'\+'
20t_MINUS = r'-'
21t_NUMBER = r'\d+'
22
23t_ignore = " \t"
24
25# Comments
26def t_comment(t):
27    r'/\*'
28    t.lexer.begin('comment')
29    print "Entering comment state"
30
31def t_comment_body_part(t):
32    r'(.|\n)*\*/'
33    print "comment body", t
34    t.lexer.begin('INITIAL')
35
36def t_error(t):
37    pass
38
39t_comment_error = t_error
40t_comment_ignore = t_ignore
41
42import sys
43
44lex.lex()
45
46data = "3 + 4 /* This is a comment */ + 10"
47
48lex.runmain(data=data)
49