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types.py
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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.
#
"""SQL Types.
Parsing and AST Nodes
"""
from dataclasses import dataclass
from typing import Optional
from typing import List
from rfmt.blocks import LineBlock as LB
from rfmt.blocks import TextBlock as TB
from rfmt.blocks import WrapBlock as WB
from .node import SQLNode
from .node import SQLNodeList
from .const import SQLNumber
from .ident import SQLIdentifier
@dataclass(frozen=True)
class SQLType(SQLNode):
@staticmethod
def parse(lex) -> 'SQLType':
return (SQLType.consume(lex) or
lex.error('expected type'))
@staticmethod
def consume(lex) -> 'Optional[SQLType]':
return (SQLConcreteType.consume(lex) or
SQLVarchar.consume(lex) or
SQLArray.consume(lex) or
SQLStruct.consume(lex))
@dataclass(frozen=True)
class SQLConcreteType(SQLType):
"""Concrete SQLConcreteType.
"""
value: str
def sqlf(self, compact):
del compact # Unused
return TB(self.value)
@staticmethod
def consume(lex) -> 'Optional[SQLConcreteType]':
typ = lex.consume_any(['INT64', 'FLOAT64', 'BOOL', 'BYTES', 'DATE',
'DATETIME', 'TIME', 'TIMESTAMP', 'STRING',
'BIGINT', 'SMALLINT', 'INT4', 'ABSTIME',
'INTEGER'])
if not typ:
return None
return SQLConcreteType(typ)
@dataclass(frozen=True)
class SQLNamedType(SQLType):
"""Named SQL Type.
"""
tname: SQLIdentifier
type: Optional[SQLType]
def sqlf(self, compact):
return LB([
self.tname.sqlf(compact),
TB(' '),
self.type.sqlf(compact)
])
@dataclass(frozen=True)
class SQLArray(SQLType):
"""SQL Array.
"""
atype: SQLType
def sqlf(self, compact):
return LB([
TB('ARRAY<'),
self.atype.sqlf(compact),
TB('>')
])
@staticmethod
def consume(lex) -> 'Optional[SQLArray]':
if not lex.consume('ARRAY'):
return None
lex.expect('<')
ntype = SQLType.parse(lex)
lex.expect('>')
return SQLArray(ntype)
@dataclass(frozen=True)
class SQLVarchar(SQLType):
size: SQLNode
def sqlf(self, compact):
return LB([
TB('VARCHAR('),
self.size.sqlf(True),
TB(')')
])
@staticmethod
def consume(lex) -> 'Optional[SQLVarchar]':
if not lex.consume('VARCHAR'):
return None
lex.expect('(')
size = (SQLNumber.consume(lex) or
lex.error('expected number'))
lex.expect(')')
return SQLVarchar(size)
@dataclass(frozen=True)
class SQLStruct(SQLType):
"""SQL Structure.
"""
vals: SQLNodeList[SQLType]
def sqlf(self, compact):
sep = ','
if compact:
sep += ' '
fields = []
for field in self.vals[0:-1]:
fields.append(LB([
field.sqlf(True), TB(sep)
]))
fields.append(self.vals[-1].sqlf(True))
if compact:
return LB(
[TB('STRUCT<')] +
fields +
[TB('>')]
)
return LB([
TB('STRUCT<'),
WB(fields),
TB('>')
])
@staticmethod
def consume(lex) -> 'Optional[SQLStruct]':
if not lex.consume('STRUCT'):
return None
lex.expect('<')
types: List[SQLType] = []
while True:
ptype = SQLType.consume(lex)
if ptype is None:
name = SQLIdentifier.parse(lex)
types.append(SQLNamedType(name, SQLType.parse(lex)))
else:
types.append(ptype)
if not lex.consume(','):
break
lex.expect('>')
return SQLStruct(SQLNodeList(types))