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
|
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Validator functions to use in patterns.
All those function have last argument as match, so it's possible to use functools.partial to bind previous arguments.
"""
def chars_before(chars, match):
"""
Validate the match if left character is in a given sequence.
:param chars:
:type chars:
:param match:
:type match:
:return:
:rtype:
"""
if match.start <= 0:
return True
return match.input_string[match.start - 1] in chars
def chars_after(chars, match):
"""
Validate the match if right character is in a given sequence.
:param chars:
:type chars:
:param match:
:type match:
:return:
:rtype:
"""
if match.end >= len(match.input_string):
return True
return match.input_string[match.end] in chars
def chars_surround(chars, match):
"""
Validate the match if surrounding characters are in a given sequence.
:param chars:
:type chars:
:param match:
:type match:
:return:
:rtype:
"""
return chars_before(chars, match) and chars_after(chars, match)
def validators(*chained_validators):
"""
Creates a validator chain from several validator functions.
:param chained_validators:
:type chained_validators:
:return:
:rtype:
"""
def validator_chain(match): # pylint:disable=missing-docstring
for chained_validator in chained_validators:
if not chained_validator(match):
return False
return True
return validator_chain
def allways_true(match): # pylint:disable=unused-argument
"""
A validator which is allways true
:param match:
:return:
"""
return True
|
