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
|
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Defines operators used in SQL expressions."""
from operator import and_, or_, inv, add, mul, sub, div, mod, truediv, \
lt, le, ne, gt, ge, eq
from sqlalchemy.util import symbol
def from_():
raise NotImplementedError()
def as_():
raise NotImplementedError()
def exists():
raise NotImplementedError()
def is_():
raise NotImplementedError()
def isnot():
raise NotImplementedError()
def collate():
raise NotImplementedError()
def op(a, opstring, b):
return a.op(opstring)(b)
def like_op(a, b, escape=None):
return a.like(b, escape=escape)
def notlike_op(a, b, escape=None):
raise NotImplementedError()
def ilike_op(a, b, escape=None):
return a.ilike(b, escape=escape)
def notilike_op(a, b, escape=None):
raise NotImplementedError()
def between_op(a, b, c):
return a.between(b, c)
def in_op(a, b):
return a.in_(b)
def notin_op(a, b):
raise NotImplementedError()
def distinct_op(a):
return a.distinct()
def startswith_op(a, b, escape=None):
return a.startswith(b, escape=escape)
def endswith_op(a, b, escape=None):
return a.endswith(b, escape=escape)
def contains_op(a, b, escape=None):
return a.contains(b, escape=escape)
def match_op(a, b):
return a.match(b)
def comma_op(a, b):
raise NotImplementedError()
def concat_op(a, b):
return a.concat(b)
def desc_op(a):
return a.desc()
def asc_op(a):
return a.asc()
_commutative = set([eq, ne, add, mul])
def is_commutative(op):
return op in _commutative
_smallest = symbol('_smallest')
_largest = symbol('_largest')
_PRECEDENCE = {
from_:15,
mul:7,
div:7,
mod:7,
add:6,
sub:6,
concat_op:6,
match_op:6,
ilike_op:5,
notilike_op:5,
like_op:5,
notlike_op:5,
in_op:5,
notin_op:5,
is_:5,
isnot:5,
eq:5,
ne:5,
gt:5,
lt:5,
ge:5,
le:5,
between_op:5,
distinct_op:5,
inv:5,
and_:3,
or_:2,
comma_op:-1,
collate: -2,
as_:-1,
exists:0,
_smallest: -1000,
_largest: 1000
}
def is_precedent(operator, against):
return _PRECEDENCE.get(operator, _PRECEDENCE[_smallest]) <= _PRECEDENCE.get(against, _PRECEDENCE[_largest])
|
