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comparison ply-3.8/test/lex_object.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_object.py
3 # -----------------------------------------------------------------------------
4 import sys
5
6 if ".." not in sys.path: sys.path.insert(0,"..")
7 import ply.lex as lex
8
9 class CalcLexer:
10 tokens = (
11 'NAME','NUMBER',
12 'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
13 'LPAREN','RPAREN',
14 )
15
16 # Tokens
17
18 t_PLUS = r'\+'
19 t_MINUS = r'-'
20 t_TIMES = r'\*'
21 t_DIVIDE = r'/'
22 t_EQUALS = r'='
23 t_LPAREN = r'\('
24 t_RPAREN = r'\)'
25 t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
26
27 def t_NUMBER(self,t):
28 r'\d+'
29 try:
30 t.value = int(t.value)
31 except ValueError:
32 print("Integer value too large %s" % t.value)
33 t.value = 0
34 return t
35
36 t_ignore = " \t"
37
38 def t_newline(self,t):
39 r'\n+'
40 t.lineno += t.value.count("\n")
41
42 def t_error(self,t):
43 print("Illegal character '%s'" % t.value[0])
44 t.lexer.skip(1)
45
46
47 calc = CalcLexer()
48
49 # Build the lexer
50 lex.lex(object=calc)
51 lex.runmain(data="3+4")
52
53
54
55