# Copyright 2008-2015 Nokia Networks
# Copyright 2016- Robot Framework Foundation
#
# 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.
from collections import OrderedDict
from robot.utils import compress_text
[docs]class StringIndex(int):
pass
[docs]class StringCache(object):
_compress_threshold = 80
_use_compressed_threshold = 1.1
_zero_index = StringIndex(0)
def __init__(self):
self._cache = OrderedDict({'*': self._zero_index})
[docs] def add(self, text):
if not text:
return self._zero_index
text = self._encode(text)
if text not in self._cache:
self._cache[text] = StringIndex(len(self._cache))
return self._cache[text]
def _encode(self, text):
raw = self._raw(text)
if raw in self._cache or len(raw) < self._compress_threshold:
return raw
compressed = compress_text(text)
if len(compressed) * self._use_compressed_threshold < len(raw):
return compressed
return raw
def _raw(self, text):
return '*'+text
[docs] def dump(self):
return tuple(self._cache)