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comparison ply-3.8/test/lex_optimize2.py @ 7267:343ff337a19b

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<ais523> ` tar -xf ply-3.8.tar.gz
author HackBot
date Wed, 23 Mar 2016 02:40:16 +0000
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7266:61a39a120dee 7267:343ff337a19b
1 # -----------------------------------------------------------------------------
2 # lex_optimize2.py
3 # -----------------------------------------------------------------------------
4 import sys
5
6 if ".." not in sys.path: sys.path.insert(0,"..")
7 import ply.lex as lex
8
9 tokens = (
10 'NAME','NUMBER',
11 'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
12 'LPAREN','RPAREN',
13 )
14
15 # Tokens
16
17 t_PLUS = r'\+'
18 t_MINUS = r'-'
19 t_TIMES = r'\*'
20 t_DIVIDE = r'/'
21 t_EQUALS = r'='
22 t_LPAREN = r'\('
23 t_RPAREN = r'\)'
24 t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
25
26 def t_NUMBER(t):
27 r'\d+'
28 try:
29 t.value = int(t.value)
30 except ValueError:
31 print("Integer value too large %s" % t.value)
32 t.value = 0
33 return t
34
35 t_ignore = " \t"
36
37 def t_newline(t):
38 r'\n+'
39 t.lineno += t.value.count("\n")
40
41 def t_error(t):
42 print("Illegal character '%s'" % t.value[0])
43 t.lexer.skip(1)
44
45 # Build the lexer
46 lex.lex(optimize=1,lextab="opt2tab")
47 lex.runmain(data="3+4")
48
49
50