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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 os.path
import pkg_resources
from yaql.language import contexts
from yaql.language import conventions
from yaql.language import factory
from yaql.language import specs
from yaql.language import utils
from yaql.language import yaqltypes
from yaql.standard_library import boolean as std_boolean
from yaql.standard_library import branching as std_branching
from yaql.standard_library import collections as std_collections
from yaql.standard_library import common as std_common
from yaql.standard_library import date_time as std_datetime
from yaql.standard_library import math as std_math
from yaql.standard_library import queries as std_queries
from yaql.standard_library import regex as std_regex
from yaql.standard_library import strings as std_strings
from yaql.standard_library import system as std_system
from yaql.standard_library import yaqlized as std_yaqlized
_cached_expressions = {}
_cached_engine = None
_default_context = None
def detect_version():
try:
dist = pkg_resources.get_distribution('yaql')
location = os.path.normcase(dist.location)
this_location = os.path.normcase(__file__)
if not this_location.startswith(os.path.join(location, 'yaql')):
raise pkg_resources.DistributionNotFound()
return dist.version
except pkg_resources.DistributionNotFound:
return 'Undefined (package was not installed with setuptools)'
__version__ = detect_version()
def _setup_context(data, context, finalizer, convention):
if context is None:
context = contexts.Context(
convention=convention or conventions.CamelCaseConvention())
if finalizer is None:
@specs.parameter('iterator', yaqltypes.Iterable())
@specs.name('#iter')
def limit(iterator):
return iterator
@specs.inject('limiter', yaqltypes.Delegate('#iter'))
@specs.inject('engine', yaqltypes.Engine())
@specs.name('#finalize')
def finalize(obj, limiter, engine):
if engine.options.get('yaql.convertOutputData', True):
return utils.convert_output_data(obj, limiter, engine)
return obj
context.register_function(limit)
context.register_function(finalize)
else:
context.register_function(finalizer)
if data is not utils.NO_VALUE:
context['$'] = utils.convert_input_data(data)
return context
def create_context(data=utils.NO_VALUE, context=None, system=True,
common=True, boolean=True, strings=True,
math=True, collections=True, queries=True,
regex=True, branching=True,
no_sets=False, finalizer=None, delegates=False,
convention=None, datetime=True, yaqlized=True,
group_by_agg_fallback=True):
context = _setup_context(data, context, finalizer, convention)
if system:
std_system.register_fallbacks(context)
context = context.create_child_context()
std_system.register(context, delegates)
if common:
std_common.register(context)
if boolean:
std_boolean.register(context)
if strings:
std_strings.register(context)
if math:
std_math.register(context)
if collections:
std_collections.register(context, no_sets)
if queries:
std_queries.register(context, group_by_agg_fallback)
if regex:
std_regex.register(context)
if branching:
std_branching.register(context)
if datetime:
std_datetime.register(context)
if yaqlized:
context = std_yaqlized.register(context)
return context
YaqlFactory = factory.YaqlFactory
def eval(expression, data=None):
global _cached_engine, _cached_expressions, _default_context
if _cached_engine is None:
_cached_engine = YaqlFactory().create()
parsed_expression = _cached_expressions.get(expression)
if parsed_expression is None:
parsed_expression = _cached_engine(expression)
_cached_expressions[expression] = parsed_expression
if _default_context is None:
_default_context = create_context()
return parsed_expression.evaluate(
data=data, context=_default_context.create_child_context())
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