1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
#
# Secret Labs' Regular Expression Engine
#
# re-compatible interface for the sre matching engine
#
# Copyright (c) 1998-2000 by Secret Labs AB. All rights reserved.
#
# Portions of this engine have been developed in cooperation with
# CNRI. Hewlett-Packard provided funding for 1.6 integration and
# other compatibility work.
#
import sre_compile
import sre_parse
# flags
I = IGNORECASE = sre_compile.SRE_FLAG_IGNORECASE
L = LOCALE = sre_compile.SRE_FLAG_LOCALE
M = MULTILINE = sre_compile.SRE_FLAG_MULTILINE
S = DOTALL = sre_compile.SRE_FLAG_DOTALL
X = VERBOSE = sre_compile.SRE_FLAG_VERBOSE
# sre extensions (may or may not be in 2.0 final)
T = TEMPLATE = sre_compile.SRE_FLAG_TEMPLATE
U = UNICODE = sre_compile.SRE_FLAG_UNICODE
# sre exception
error = sre_compile.error
# --------------------------------------------------------------------
# public interface
# FIXME: add docstrings
def match(pattern, string, flags=0):
return _compile(pattern, flags).match(string)
def search(pattern, string, flags=0):
return _compile(pattern, flags).search(string)
def sub(pattern, repl, string, count=0):
return _compile(pattern).sub(repl, string, count)
def subn(pattern, repl, string, count=0):
return _compile(pattern).subn(repl, string, count)
def split(pattern, string, maxsplit=0):
return _compile(pattern).split(string, maxsplit)
def findall(pattern, string, maxsplit=0):
return _compile(pattern).findall(string, maxsplit)
def compile(pattern, flags=0):
return _compile(pattern, flags)
def template(pattern, flags=0):
return _compile(pattern, flags|T)
def escape(pattern):
s = list(pattern)
for i in range(len(pattern)):
c = pattern[i]
if not ("a" <= c <= "z" or "A" <= c <= "Z" or "0" <= c <= "9"):
if c == "\000":
s[i] = "\\000"
else:
s[i] = "\\" + c
return pattern[:0].join(s)
# --------------------------------------------------------------------
# internals
_cache = {}
_MAXCACHE = 100
def _compile(pattern, flags=0):
# internal: compile pattern
tp = type(pattern)
if tp not in (type(""), type(u"")):
return pattern
key = (tp, pattern, flags)
try:
return _cache[key]
except KeyError:
pass
p = sre_compile.compile(pattern, flags)
if len(_cache) >= _MAXCACHE:
_cache.clear()
_cache[key] = p
return p
def purge():
# clear pattern cache
_cache.clear()
def _sub(pattern, template, string, count=0):
# internal: pattern.sub implementation hook
return _subn(pattern, template, string, count)[0]
def _subn(pattern, template, string, count=0):
# internal: pattern.subn implementation hook
if callable(template):
filter = template
else:
template = sre_parse.parse_template(template, pattern)
def filter(match, template=template):
return sre_parse.expand_template(template, match)
n = i = 0
s = []
append = s.append
c = pattern.scanner(string)
while not count or n < count:
m = c.search()
if not m:
break
b, e = m.span()
if i < b:
append(string[i:b])
append(filter(m))
i = e
n = n + 1
append(string[i:])
return string[:0].join(s), n
def _split(pattern, string, maxsplit=0):
# internal: pattern.split implementation hook
n = i = 0
s = []
append = s.append
extend = s.extend
c = pattern.scanner(string)
g = pattern.groups
while not maxsplit or n < maxsplit:
m = c.search()
if not m:
break
b, e = m.span()
if b == e:
if i >= len(string):
break
continue
append(string[i:b])
if g and b != e:
extend(m.groups())
i = e
n = n + 1
append(string[i:])
return s
# register myself for pickling
import copy_reg
def _pickle(p):
return _compile, (p.pattern, p.flags)
copy_reg.pickle(type(_compile("")), _pickle, _compile)
|
