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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Base builder class for Rebulk
"""
from abc import ABCMeta, abstractmethod
from contextlib import contextmanager
from copy import deepcopy
from logging import getLogger
from .loose import set_defaults
from .pattern import RePattern, StringPattern, FunctionalPattern
log = getLogger(__name__).log
@contextmanager
def overrides(kwargs):
"""
Implements override kwarg to restore initial kwarg arguments from overrides list after set_defaults calls.
:param kwargs:
:return:
"""
override_keys = kwargs.pop('overrides', None)
backup = {}
if override_keys:
for override_key in override_keys:
backup[override_key] = kwargs[override_key]
yield backup
kwargs.update(backup)
class Builder(metaclass=ABCMeta):
"""
Base builder class for patterns
"""
def __init__(self):
self._defaults = {}
self._regex_defaults = {}
self._string_defaults = {}
self._functional_defaults = {}
self._chain_defaults = {}
def reset(self):
"""
Reset all defaults.
:return:
"""
self.__init__() # pylint: disable=unnecessary-dunder-call
def defaults(self, **kwargs):
"""
Define default keyword arguments for all patterns
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
set_defaults(kwargs, self._defaults, override=True)
return self
def regex_defaults(self, **kwargs):
"""
Define default keyword arguments for functional patterns.
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
set_defaults(kwargs, self._regex_defaults, override=True)
return self
def string_defaults(self, **kwargs):
"""
Define default keyword arguments for string patterns.
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
set_defaults(kwargs, self._string_defaults, override=True)
return self
def functional_defaults(self, **kwargs):
"""
Define default keyword arguments for functional patterns.
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
set_defaults(kwargs, self._functional_defaults, override=True)
return self
def chain_defaults(self, **kwargs):
"""
Define default keyword arguments for patterns chain.
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
set_defaults(kwargs, self._chain_defaults, override=True)
return self
def build_re(self, *pattern, **kwargs):
"""
Builds a new regular expression pattern
:param pattern:
:type pattern:
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
with overrides(kwargs):
set_defaults(self._regex_defaults, kwargs)
set_defaults(self._defaults, kwargs)
return RePattern(*pattern, **kwargs)
def build_string(self, *pattern, **kwargs):
"""
Builds a new string pattern
:param pattern:
:type pattern:
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
with overrides(kwargs):
set_defaults(self._string_defaults, kwargs)
set_defaults(self._defaults, kwargs)
return StringPattern(*pattern, **kwargs)
def build_functional(self, *pattern, **kwargs):
"""
Builds a new functional pattern
:param pattern:
:type pattern:
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
with overrides(kwargs):
set_defaults(self._functional_defaults, kwargs)
set_defaults(self._defaults, kwargs)
return FunctionalPattern(*pattern, **kwargs)
def build_chain(self, **kwargs):
"""
Builds a new patterns chain
:param pattern:
:type pattern:
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
from .chain import Chain # pylint:disable=import-outside-toplevel,cyclic-import
with overrides(kwargs):
set_defaults(self._chain_defaults, kwargs)
set_defaults(self._defaults, kwargs)
chain = Chain(self, **kwargs)
chain._defaults = deepcopy(self._defaults) # pylint: disable=protected-access
chain._regex_defaults = deepcopy(self._regex_defaults) # pylint: disable=protected-access
chain._functional_defaults = deepcopy(self._functional_defaults) # pylint: disable=protected-access
chain._string_defaults = deepcopy(self._string_defaults) # pylint: disable=protected-access
chain._chain_defaults = deepcopy(self._chain_defaults) # pylint: disable=protected-access
return chain
@abstractmethod
def pattern(self, *pattern):
"""
Register a list of Pattern instance
:param pattern:
:return:
"""
def regex(self, *pattern, **kwargs):
"""
Add re pattern
:param pattern:
:type pattern:
:return: self
:rtype: Rebulk
"""
return self.pattern(self.build_re(*pattern, **kwargs))
def string(self, *pattern, **kwargs):
"""
Add string pattern
:param pattern:
:type pattern:
:return: self
:rtype: Rebulk
"""
return self.pattern(self.build_string(*pattern, **kwargs))
def functional(self, *pattern, **kwargs):
"""
Add functional pattern
:param pattern:
:type pattern:
:return: self
:rtype: Rebulk
"""
functional = self.build_functional(*pattern, **kwargs)
return self.pattern(functional)
def chain(self, **kwargs):
"""
Add patterns chain, using configuration of this rebulk
:param pattern:
:type pattern:
:param kwargs:
:type kwargs:
:return:
:rtype:
"""
chain = self.build_chain(**kwargs)
self.pattern(chain)
return chain
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