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# Copyright (c) 2015 Mirantis, Inc.
#
# 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
#
# http://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.
import collections
import re
import uuid
from ply import lex
from ply import yacc
from yaql.language import exceptions
from yaql.language import expressions
from yaql.language import lexer
from yaql.language import parser
from yaql.language import utils
OperatorType = collections.namedtuple('OperatorType', [
'PREFIX_UNARY', 'SUFFIX_UNARY',
'BINARY_LEFT_ASSOCIATIVE', 'BINARY_RIGHT_ASSOCIATIVE',
'NAME_VALUE_PAIR'
])(
PREFIX_UNARY='PREFIX_UNARY',
SUFFIX_UNARY='SUFFIX_UNARY',
BINARY_LEFT_ASSOCIATIVE='BINARY_LEFT_ASSOCIATIVE',
BINARY_RIGHT_ASSOCIATIVE='BINARY_RIGHT_ASSOCIATIVE',
NAME_VALUE_PAIR='NAME_VALUE_PAIR'
)
class YaqlOperators(object):
def __init__(self, operators, name_value_op=None):
self.operators = operators
self.name_value_op = name_value_op
class YaqlEngine(object):
def __init__(self, ply_lexer, ply_parser, options, factory):
self._lexer = ply_lexer
self._parser = ply_parser
self._options = utils.FrozenDict(options or {})
self._factory = factory
@property
def lexer(self):
return self._lexer
@property
def parser(self):
return self._parser
@property
def options(self):
return self._options
@property
def factory(self):
return self._factory
def __call__(self, expression, options=None):
if options:
return self.copy(options)(expression)
return expressions.Statement(
self.parser.parse(expression, lexer=self.lexer), self)
def copy(self, options):
opt = dict(self._options)
opt.update(options)
return YaqlEngine(self._lexer, self._parser, opt, self._factory)
class YaqlFactory(object):
def __init__(self, keyword_operator='=>', allow_delegates=False):
self._keyword_operator = keyword_operator
self._allow_delegates = allow_delegates
self.operators = self._standard_operators()
if keyword_operator:
self.operators.insert(0, (keyword_operator,
OperatorType.NAME_VALUE_PAIR))
@property
def keyword_operator(self):
return self._keyword_operator
@property
def allow_delegates(self):
return self._allow_delegates
# noinspection PyMethodMayBeStatic
def _standard_operators(self):
return [
('.', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('?.', OperatorType.BINARY_LEFT_ASSOCIATIVE),
(),
('[]', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('{}', OperatorType.BINARY_LEFT_ASSOCIATIVE),
(),
('+', OperatorType.PREFIX_UNARY),
('-', OperatorType.PREFIX_UNARY),
(),
('=~', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('!~', OperatorType.BINARY_LEFT_ASSOCIATIVE),
(),
('*', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('/', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('mod', OperatorType.BINARY_LEFT_ASSOCIATIVE),
(),
('+', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('-', OperatorType.BINARY_LEFT_ASSOCIATIVE),
(),
('>', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('<', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('>=', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('<=', OperatorType.BINARY_LEFT_ASSOCIATIVE),
('!=', OperatorType.BINARY_LEFT_ASSOCIATIVE, 'not_equal'),
('=', OperatorType.BINARY_LEFT_ASSOCIATIVE, 'equal'),
('in', OperatorType.BINARY_LEFT_ASSOCIATIVE),
(),
('not', OperatorType.PREFIX_UNARY),
(),
('and', OperatorType.BINARY_LEFT_ASSOCIATIVE),
(),
('or', OperatorType.BINARY_LEFT_ASSOCIATIVE),
(),
('->', OperatorType.BINARY_RIGHT_ASSOCIATIVE),
]
def insert_operator(self, existing_operator, existing_operator_binary,
new_operator, new_operator_type, create_group,
new_operator_alias=None):
binary_types = (OperatorType.BINARY_RIGHT_ASSOCIATIVE,
OperatorType.BINARY_LEFT_ASSOCIATIVE)
unary_types = (OperatorType.PREFIX_UNARY, OperatorType.SUFFIX_UNARY)
position = 0
if existing_operator is not None:
position = -1
for i, t in enumerate(self.operators):
if len(t) < 2 or t[0] != existing_operator:
continue
if existing_operator_binary and t[1] not in binary_types:
continue
if not existing_operator_binary and t[1] not in unary_types:
continue
position = i
break
if position < 0:
raise ValueError('Operator {0} is not found'.format(
existing_operator))
while position < len(self.operators) and len(
self.operators[position]) > 1:
position += 1
if create_group:
if position == len(self.operators):
self.operators.append(())
position += 1
else:
while position < len(self.operators) and len(
self.operators[position]) < 2:
position += 1
self.operators.insert(position, ())
self.operators.insert(
position, (new_operator, new_operator_type, new_operator_alias))
@staticmethod
def _name_generator():
value = 1
while True:
t = value
chars = []
while t:
chars.append(chr(ord('A') + t % 26))
t //= 26
yield ''.join(chars)
value += 1
def _build_operator_table(self, name_generator):
operators = {}
name_value_op = None
precedence = 1
for record in self.operators:
if not record:
precedence += 1
continue
up, bp, name, alias = operators.get(record[0], (0, 0, '', None))
if record[1] == OperatorType.NAME_VALUE_PAIR:
if name_value_op is not None:
raise exceptions.InvalidOperatorTableException(record[0])
name_value_op = record[0]
continue
if record[1] == OperatorType.PREFIX_UNARY:
if up:
raise exceptions.InvalidOperatorTableException(record[0])
up = precedence
elif record[1] == OperatorType.SUFFIX_UNARY:
if up:
raise exceptions.InvalidOperatorTableException(record[0])
up = -precedence
elif record[1] == OperatorType.BINARY_LEFT_ASSOCIATIVE:
if bp:
raise exceptions.InvalidOperatorTableException(record[0])
bp = precedence
elif record[1] == OperatorType.BINARY_RIGHT_ASSOCIATIVE:
if bp:
raise exceptions.InvalidOperatorTableException(record[0])
bp = -precedence
if record[0] == '[]':
name = 'INDEXER'
elif record[0] == '{}':
name = 'MAP'
else:
name = name or 'OP_' + next(name_generator)
operators[record[0]] = (
up, bp, name, record[2] if len(record) > 2 else None)
return YaqlOperators(operators, name_value_op)
# noinspection PyMethodMayBeStatic
def _create_lexer(self, operators):
return lexer.Lexer(operators)
# noinspection PyMethodMayBeStatic
def _create_parser(self, lexer_rules, operators):
return parser.Parser(lexer_rules, operators, self)
def create(self, options=None):
names = self._name_generator()
operators = self._build_operator_table(names)
lexer_rules = self._create_lexer(operators)
ply_lexer = lex.lex(object=lexer_rules,
reflags=re.UNICODE | re.VERBOSE)
ply_parser = yacc.yacc(
module=self._create_parser(lexer_rules, operators),
debug=False if not options else options.get('yaql.debug', False),
tabmodule='m' + uuid.uuid4().hex, write_tables=False)
return YaqlEngine(ply_lexer, ply_parser, options, self)
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