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# -*- encoding: utf8 -*-
# This file is part of ranger, the console file manager.
# License: GNU GPL version 3, see the file "AUTHORS" for details.
import sys
from unicodedata import east_asian_width
PY3 = sys.version_info[0] >= 3
ASCIIONLY = set(chr(c) for c in range(1, 128))
NARROW = 1
WIDE = 2
WIDE_SYMBOLS = set('WF')
def uwid(string):
"""Return the width of a string"""
if not PY3:
string = string.decode('utf-8', 'ignore')
return sum(utf_char_width(c) for c in string)
def utf_char_width(string):
"""Return the width of a single character"""
if east_asian_width(string) in WIDE_SYMBOLS:
return WIDE
return NARROW
def string_to_charlist(string):
"""Return a list of characters with extra empty strings after wide chars"""
if not set(string) - ASCIIONLY:
return list(string)
result = []
if PY3:
for c in string:
result.append(c)
if east_asian_width(c) in WIDE_SYMBOLS:
result.append('')
else:
try:
# This raised a "UnicodeEncodeError: 'ascii' codec can't encode
# character u'\xe4' in position 10: ordinal not in range(128)"
# for me once. I thought errors='ignore' means IGNORE THE DAMN
# ERRORS but apparently it doesn't.
string = string.decode('utf-8', 'ignore')
except UnicodeEncodeError:
return []
for c in string:
result.append(c.encode('utf-8'))
if east_asian_width(c) in WIDE_SYMBOLS:
result.append('')
return result
class WideString(object):
def __init__(self, string, chars=None):
try:
self.string = str(string)
except UnicodeEncodeError:
# Here I assume that string is a "unicode" object, because why else
# would str(string) raise a UnicodeEncodeError?
try:
self.string = string.encode('latin-1', 'ignore')
except Exception:
self.string = ""
if chars is None:
self.chars = string_to_charlist(string)
else:
self.chars = chars
def __add__(self, string):
"""
>>> (WideString("a") + WideString("b")).string
'ab'
>>> (WideString("a") + WideString("b")).chars
['a', 'b']
>>> (WideString("afd") + "bc").chars
['a', 'f', 'd', 'b', 'c']
"""
if isinstance(string, str):
return WideString(self.string + string)
elif isinstance(string, WideString):
return WideString(self.string + string.string,
self.chars + string.chars)
def __radd__(self, string):
"""
>>> ("bc" + WideString("afd")).chars
['b', 'c', 'a', 'f', 'd']
"""
if isinstance(string, str):
return WideString(string + self.string)
elif isinstance(string, WideString):
return WideString(string.string + self.string,
string.chars + self.chars)
def __str__(self):
return self.string
def __repr__(self):
return '<' + self.__class__.__name__ + " '" + self.string + "'>"
def __getslice__(self, a, z):
"""
>>> WideString("asdf")[1:3]
<WideString 'sd'>
>>> WideString("asdf")[1:-100]
<WideString ''>
>>> WideString("モヒカン")[2:4]
<WideString 'ヒ'>
>>> WideString("モヒカン")[2:5]
<WideString 'ヒ '>
>>> WideString("モabカン")[2:5]
<WideString 'ab '>
>>> WideString("モヒカン")[1:5]
<WideString ' ヒ '>
>>> WideString("モヒカン")[:]
<WideString 'モヒカン'>
>>> WideString("aモ")[0:3]
<WideString 'aモ'>
>>> WideString("aモ")[0:2]
<WideString 'a '>
>>> WideString("aモ")[0:1]
<WideString 'a'>
"""
if z is None or z > len(self.chars):
z = len(self.chars)
if z < 0:
z = len(self.chars) + z
if z < 0:
return WideString("")
if a is None or a < 0:
a = 0
if z < len(self.chars) and self.chars[z] == '':
if self.chars[a] == '':
return WideString(' ' + ''.join(self.chars[a:z - 1]) + ' ')
return WideString(''.join(self.chars[a:z - 1]) + ' ')
if self.chars[a] == '':
return WideString(' ' + ''.join(self.chars[a:z - 1]))
return WideString(''.join(self.chars[a:z]))
def __getitem__(self, i):
"""
>>> WideString("asdf")[2]
<WideString 'd'>
>>> WideString("……")[0]
<WideString '…'>
>>> WideString("……")[1]
<WideString '…'>
"""
if isinstance(i, slice):
return self.__getslice__(i.start, i.stop)
return self.__getslice__(i, i + 1)
def __len__(self):
"""
>>> len(WideString("poo"))
3
>>> len(WideString("モヒカン"))
8
"""
return len(self.chars)
if __name__ == '__main__':
import doctest
doctest.testmod()
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