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# -*- coding: utf-8 -*-
# Copyright 2015 moco_beta
#
# 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 re
import unicodedata
class CharFilter(object):
u"""
Base CharFilter class.
A CharFilter modifies or transforms the input text according to the rule described in apply() method.
Subclasses must implement apply() method.
Added in *version 0.3.4*
"""
def filter(self, text):
return self.apply(text)
def apply(self, text):
raise NotImplementedError
class RegexReplaceCharFilter(CharFilter):
u"""
RegexReplaceCharFilter replaces string matched with a regular expression pattern to replacement string.
Added in *version 0.3.4*
"""
def __init__(self, pat, repl):
"""
Initialize RegexReplaceCharFilter with a regular expression pattern string and replacement.
:param pattern: regular expression string.
:param repl: replacement string.
"""
self.pattern = re.compile(pat)
self.replacement = repl
def apply(self, text):
return re.sub(self.pattern, self.replacement, text)
class UnicodeNormalizeCharFilter(CharFilter):
u"""
UnicodeNormalizeCharFilter normalizes Unicode string.
Added in *version 0.3.4*
"""
def __init__(self, form='NFKC'):
"""
Initialize UnicodeNormalizeCharFilter with normalization form.
See also `unicodedata.normalize <https://docs.python.org/3.6/library/unicodedata.html#unicodedata.normalize>`_ for details.
:param form: (Optional) normalization form. valid values for *form* are 'NFC', 'NFKC', 'NFD', and 'NFKD'. default is 'NFKC'
"""
self.form = form
def apply(self, text):
return unicodedata.normalize(self.form, text)
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