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import six
import sys
def to_utf8(value):
"""
Converts value to string encoded into utf-8
:param value:
:return:
"""
if sys.version_info[0] < 3:
if not isinstance(value, basestring): # noqa
value = unicode(value) # noqa
if isinstance(value, str):
value = value.decode("utf-8", errors="ignore")
return value.encode('utf-8', 'ignore')
else:
return str(value)
def trim_string(s, max_bytes):
"""
Adjusts the length of the string s in order to fit it
into max_bytes bytes of storage after encoding as UTF-8.
Useful when cutting filesystem paths.
:param s: unicode string
:param max_bytes: number of bytes
:return the prefix of s
"""
if isinstance(s, six.text_type):
return _trim_unicode_string(s, max_bytes)
if isinstance(s, six.binary_type):
if len(s) <= max_bytes:
return s
s = s.decode('utf-8', errors='ignore')
s = _trim_unicode_string(s, max_bytes)
s = s.encode('utf-8', errors='ignore')
return s
raise TypeError('a string is expected')
def _trim_unicode_string(s, max_bytes):
if len(s) * 4 <= max_bytes:
# UTF-8 uses at most 4 bytes per character
return s
result = []
cur_byte_length = 0
for ch in s:
cur_byte_length += len(ch.encode('utf-8'))
if cur_byte_length > max_bytes:
break
result.append(ch)
return ''.join(result)
def to_str(s):
if six.PY2 and isinstance(s, six.text_type):
return s.encode('utf8')
return s
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