This repository was archived by the owner on Apr 18, 2026. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 14
Expand file tree
/
Copy pathquery.py
More file actions
99 lines (76 loc) · 2.75 KB
/
query.py
File metadata and controls
99 lines (76 loc) · 2.75 KB
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
# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
from dataclasses import dataclass
from typing import Optional
from rfmt.blocks import LineBlock as LB
from rfmt.blocks import TextBlock as TB
from .node import SQLNode
from .ident import SQLIdentifierPath
from .ident import SQLIdentifier
@dataclass(frozen=True)
class SQLAlias(SQLNode):
alias: SQLIdentifier
def sqlf(self, compact):
return LB([TB('AS '), self.alias.sqlf(True)])
@staticmethod
def consume(lex) -> 'Optional[SQLAlias]':
if lex.consume('AS'):
return SQLAlias(SQLIdentifier.parse(lex))
alias = SQLIdentifier.consume(lex)
if not alias:
return None
return SQLAlias(alias)
@dataclass(frozen=True)
class SQLTableSource(SQLNode):
@staticmethod
def parse(lex) -> 'SQLTableSource':
from .query_impl import SQLSubSelect
if lex.consume('('):
table = SQLQuery.parse(lex)
lex.expect(')')
alias = SQLAlias.consume(lex)
return SQLSubSelect(table, alias)
# Named Table (read-context)
return SQLNamedTable.parse(lex, False)
@dataclass(frozen=True)
class SQLNamedTable(SQLTableSource):
table: SQLIdentifierPath
alias: Optional[SQLAlias] = None
is_write: bool = False
def sqlf(self, compact):
expr = self.table.sqlf(compact)
if self.alias is not None:
expr = LB(
[expr, TB(' '), self.alias.sqlf(True)])
return expr
@staticmethod
def parse(lex, is_write=False) -> 'SQLNamedTable':
table_name = SQLIdentifierPath.parse(lex)
alias = SQLAlias.consume(lex)
return SQLNamedTable(table_name, alias, is_write)
@staticmethod
def parse_no_alias(lex, is_write=False) -> 'SQLNamedTable':
table_name = SQLIdentifierPath.parse(lex)
return SQLNamedTable(table_name, None, is_write)
@dataclass(frozen=True)
class SQLQuery(SQLTableSource):
@staticmethod
def parse(lex) -> 'SQLQuery':
from .query_impl import SQLWithSelect
return SQLWithSelect.parse(lex)
@staticmethod
def consume(lex) -> 'Optional[SQLQuery]':
from .query_impl import SQLWithSelect
return SQLWithSelect.consume(lex)