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# 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.
"""Parser generator for SQL Commands independent data operations.
Usage:
cmd = SQLCommand.consume(lex)
"""
from dataclasses import dataclass
from typing import Optional
from rfmt.blocks import LineBlock as LB
from rfmt.blocks import TextBlock as TB
from .query import SQLNamedTable
from .node import SQLNode
@dataclass(frozen=True)
class SQLCommand(SQLNode):
@staticmethod
def consume(lex) -> 'Optional[SQLCommand]':
return (SQLTruncate.consume(lex) or
SQLGenerateStatistics.consume(lex) or
SQLGroom.consume(lex) or
SQLTrans.consume(lex))
@dataclass(frozen=True)
class SQLTruncate(SQLCommand):
table: SQLNamedTable
def sqlf(self, compact):
return LB([
TB('TRUNCATE TABLE '),
self.table.sqlf(compact=True)
])
@staticmethod
def consume(lex) -> 'Optional[SQLTruncate]':
if not lex.consume('TRUNCATE'):
return None
lex.consume('TABLE')
table_name = SQLNamedTable.parse(lex, is_write=True)
return SQLTruncate(table_name)
@dataclass(frozen=True)
class SQLGenerateStatistics(SQLCommand):
table: SQLNamedTable
def sqlf(self, compact):
return LB([
TB('GENERATE STATISTICS ON '),
self.table.sqlf(compact=True)
])
@staticmethod
def consume(lex) -> 'Optional[SQLGenerateStatistics]':
if not lex.consume(['GENERATE', 'STATISTICS', 'ON']):
return None
lex.consume('TABLE')
table = SQLNamedTable.parse(lex, is_write=True)
return SQLGenerateStatistics(table)
@dataclass(frozen=True)
class SQLGroom(SQLCommand):
table: SQLNamedTable
def sqlf(self, compact):
return LB([
TB('GROOM TABLE '),
self.table.sqlf(compact=True),
TB(' RECORDS ALL'),
])
@staticmethod
def consume(lex) -> 'Optional[SQLGroom]':
if not lex.consume(['GROOM', 'TABLE']):
return None
table = SQLNamedTable.parse(lex, is_write=True)
lex.expect('RECORDS')
lex.expect('ALL')
return SQLGroom(table)
@dataclass(frozen=True)
class SQLTrans(SQLCommand):
trans: str
def sqlf(self, compact):
return TB(self.trans)
@staticmethod
def consume(lex) -> 'Optional[SQLTrans]':
if lex.consume('BEGIN'):
return SQLTrans('BEGIN')
if lex.consume('COMMIT'):
return SQLTrans('COMMIT')
if lex.consume('ABORT'):
return SQLTrans('ABORT')
return None