mirror of https://github.com/apache/cassandra
380 lines
16 KiB
Python
380 lines
16 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# adapted from http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
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# -thepaul
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# This is an implementation of wcwidth() and wcswidth() (defined in
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# IEEE Std 1002.1-2001) for Unicode.
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#
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# http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
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# http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
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#
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# In fixed-width output devices, Latin characters all occupy a single
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# "cell" position of equal width, whereas ideographic CJK characters
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# occupy two such cells. Interoperability between terminal-line
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# applications and (teletype-style) character terminals using the
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# UTF-8 encoding requires agreement on which character should advance
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# the cursor by how many cell positions. No established formal
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# standards exist at present on which Unicode character shall occupy
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# how many cell positions on character terminals. These routines are
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# a first attempt of defining such behavior based on simple rules
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# applied to data provided by the Unicode Consortium.
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#
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# For some graphical characters, the Unicode standard explicitly
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# defines a character-cell width via the definition of the East Asian
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# FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
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# In all these cases, there is no ambiguity about which width a
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# terminal shall use. For characters in the East Asian Ambiguous (A)
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# class, the width choice depends purely on a preference of backward
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# compatibility with either historic CJK or Western practice.
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# Choosing single-width for these characters is easy to justify as
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# the appropriate long-term solution, as the CJK practice of
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# displaying these characters as double-width comes from historic
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# implementation simplicity (8-bit encoded characters were displayed
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# single-width and 16-bit ones double-width, even for Greek,
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# Cyrillic, etc.) and not any typographic considerations.
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#
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# Much less clear is the choice of width for the Not East Asian
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# (Neutral) class. Existing practice does not dictate a width for any
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# of these characters. It would nevertheless make sense
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# typographically to allocate two character cells to characters such
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# as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
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# represented adequately with a single-width glyph. The following
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# routines at present merely assign a single-cell width to all
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# neutral characters, in the interest of simplicity. This is not
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# entirely satisfactory and should be reconsidered before
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# establishing a formal standard in this area. At the moment, the
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# decision which Not East Asian (Neutral) characters should be
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# represented by double-width glyphs cannot yet be answered by
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# applying a simple rule from the Unicode database content. Setting
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# up a proper standard for the behavior of UTF-8 character terminals
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# will require a careful analysis not only of each Unicode character,
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# but also of each presentation form, something the author of these
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# routines has avoided to do so far.
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#
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# http://www.unicode.org/unicode/reports/tr11/
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#
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# Markus Kuhn -- 2007-05-26 (Unicode 5.0)
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#
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# Permission to use, copy, modify, and distribute this software
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# for any purpose and without fee is hereby granted. The author
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# disclaims all warranties with regard to this software.
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#
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# Latest C version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
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# auxiliary function for binary search in interval table
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def bisearch(ucs, table):
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min = 0
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max = len(table) - 1
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if ucs < table[0][0] or ucs > table[max][1]:
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return 0
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while max >= min:
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mid = int((min + max) / 2)
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if ucs > table[mid][1]:
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min = mid + 1
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elif ucs < table[mid][0]:
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max = mid - 1
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else:
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return 1
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return 0
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# The following two functions define the column width of an ISO 10646
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# character as follows:
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#
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# - The null character (U+0000) has a column width of 0.
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#
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# - Other C0/C1 control characters and DEL will lead to a return
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# value of -1.
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#
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# - Non-spacing and enclosing combining characters (general
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# category code Mn or Me in the Unicode database) have a
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# column width of 0.
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#
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# - SOFT HYPHEN (U+00AD) has a column width of 1.
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#
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# - Other format characters (general category code Cf in the Unicode
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# database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
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#
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# - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
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# have a column width of 0.
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#
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# - Spacing characters in the East Asian Wide (W) or East Asian
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# Full-width (F) category as defined in Unicode Technical
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# Report #11 have a column width of 2.
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#
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# - All remaining characters (including all printable
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# ISO 8859-1 and WGL4 characters, Unicode control characters,
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# etc.) have a column width of 1.
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#
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# This implementation assumes that wchar_t characters are encoded
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# in ISO 10646.
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# sorted list of non-overlapping intervals of non-spacing characters
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# generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c"
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combining = (
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(0x0300, 0x036F), (0x0483, 0x0486), (0x0488, 0x0489),
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(0x0591, 0x05BD), (0x05BF, 0x05BF), (0x05C1, 0x05C2),
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(0x05C4, 0x05C5), (0x05C7, 0x05C7), (0x0600, 0x0603),
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(0x0610, 0x0615), (0x064B, 0x065E), (0x0670, 0x0670),
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(0x06D6, 0x06E4), (0x06E7, 0x06E8), (0x06EA, 0x06ED),
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(0x070F, 0x070F), (0x0711, 0x0711), (0x0730, 0x074A),
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(0x07A6, 0x07B0), (0x07EB, 0x07F3), (0x0901, 0x0902),
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(0x093C, 0x093C), (0x0941, 0x0948), (0x094D, 0x094D),
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(0x0951, 0x0954), (0x0962, 0x0963), (0x0981, 0x0981),
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(0x09BC, 0x09BC), (0x09C1, 0x09C4), (0x09CD, 0x09CD),
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(0x09E2, 0x09E3), (0x0A01, 0x0A02), (0x0A3C, 0x0A3C),
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(0x0A41, 0x0A42), (0x0A47, 0x0A48), (0x0A4B, 0x0A4D),
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(0x0A70, 0x0A71), (0x0A81, 0x0A82), (0x0ABC, 0x0ABC),
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(0x0AC1, 0x0AC5), (0x0AC7, 0x0AC8), (0x0ACD, 0x0ACD),
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(0x0AE2, 0x0AE3), (0x0B01, 0x0B01), (0x0B3C, 0x0B3C),
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(0x0B3F, 0x0B3F), (0x0B41, 0x0B43), (0x0B4D, 0x0B4D),
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(0x0B56, 0x0B56), (0x0B82, 0x0B82), (0x0BC0, 0x0BC0),
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(0x0BCD, 0x0BCD), (0x0C3E, 0x0C40), (0x0C46, 0x0C48),
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(0x0C4A, 0x0C4D), (0x0C55, 0x0C56), (0x0CBC, 0x0CBC),
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(0x0CBF, 0x0CBF), (0x0CC6, 0x0CC6), (0x0CCC, 0x0CCD),
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(0x0CE2, 0x0CE3), (0x0D41, 0x0D43), (0x0D4D, 0x0D4D),
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(0x0DCA, 0x0DCA), (0x0DD2, 0x0DD4), (0x0DD6, 0x0DD6),
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(0x0E31, 0x0E31), (0x0E34, 0x0E3A), (0x0E47, 0x0E4E),
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(0x0EB1, 0x0EB1), (0x0EB4, 0x0EB9), (0x0EBB, 0x0EBC),
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(0x0EC8, 0x0ECD), (0x0F18, 0x0F19), (0x0F35, 0x0F35),
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(0x0F37, 0x0F37), (0x0F39, 0x0F39), (0x0F71, 0x0F7E),
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(0x0F80, 0x0F84), (0x0F86, 0x0F87), (0x0F90, 0x0F97),
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(0x0F99, 0x0FBC), (0x0FC6, 0x0FC6), (0x102D, 0x1030),
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(0x1032, 0x1032), (0x1036, 0x1037), (0x1039, 0x1039),
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(0x1058, 0x1059), (0x1160, 0x11FF), (0x135F, 0x135F),
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(0x1712, 0x1714), (0x1732, 0x1734), (0x1752, 0x1753),
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(0x1772, 0x1773), (0x17B4, 0x17B5), (0x17B7, 0x17BD),
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(0x17C6, 0x17C6), (0x17C9, 0x17D3), (0x17DD, 0x17DD),
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(0x180B, 0x180D), (0x18A9, 0x18A9), (0x1920, 0x1922),
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(0x1927, 0x1928), (0x1932, 0x1932), (0x1939, 0x193B),
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(0x1A17, 0x1A18), (0x1B00, 0x1B03), (0x1B34, 0x1B34),
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(0x1B36, 0x1B3A), (0x1B3C, 0x1B3C), (0x1B42, 0x1B42),
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(0x1B6B, 0x1B73), (0x1DC0, 0x1DCA), (0x1DFE, 0x1DFF),
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(0x200B, 0x200F), (0x202A, 0x202E), (0x2060, 0x2063),
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(0x206A, 0x206F), (0x20D0, 0x20EF), (0x302A, 0x302F),
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(0x3099, 0x309A), (0xA806, 0xA806), (0xA80B, 0xA80B),
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(0xA825, 0xA826), (0xFB1E, 0xFB1E), (0xFE00, 0xFE0F),
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(0xFE20, 0xFE23), (0xFEFF, 0xFEFF), (0xFFF9, 0xFFFB),
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(0x10A01, 0x10A03), (0x10A05, 0x10A06), (0x10A0C, 0x10A0F),
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(0x10A38, 0x10A3A), (0x10A3F, 0x10A3F), (0x1D167, 0x1D169),
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(0x1D173, 0x1D182), (0x1D185, 0x1D18B), (0x1D1AA, 0x1D1AD),
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(0x1D242, 0x1D244), (0xE0001, 0xE0001), (0xE0020, 0xE007F),
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(0xE0100, 0xE01EF)
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)
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# sorted list of non-overlapping intervals of East Asian Ambiguous
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# characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c"
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ambiguous = (
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(0x00A1, 0x00A1), (0x00A4, 0x00A4), (0x00A7, 0x00A8),
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(0x00AA, 0x00AA), (0x00AE, 0x00AE), (0x00B0, 0x00B4),
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(0x00B6, 0x00BA), (0x00BC, 0x00BF), (0x00C6, 0x00C6),
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(0x00D0, 0x00D0), (0x00D7, 0x00D8), (0x00DE, 0x00E1),
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(0x00E6, 0x00E6), (0x00E8, 0x00EA), (0x00EC, 0x00ED),
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(0x00F0, 0x00F0), (0x00F2, 0x00F3), (0x00F7, 0x00FA),
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(0x00FC, 0x00FC), (0x00FE, 0x00FE), (0x0101, 0x0101),
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(0x0111, 0x0111), (0x0113, 0x0113), (0x011B, 0x011B),
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(0x0126, 0x0127), (0x012B, 0x012B), (0x0131, 0x0133),
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(0x0138, 0x0138), (0x013F, 0x0142), (0x0144, 0x0144),
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(0x0148, 0x014B), (0x014D, 0x014D), (0x0152, 0x0153),
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(0x0166, 0x0167), (0x016B, 0x016B), (0x01CE, 0x01CE),
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(0x01D0, 0x01D0), (0x01D2, 0x01D2), (0x01D4, 0x01D4),
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(0x01D6, 0x01D6), (0x01D8, 0x01D8), (0x01DA, 0x01DA),
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(0x01DC, 0x01DC), (0x0251, 0x0251), (0x0261, 0x0261),
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(0x02C4, 0x02C4), (0x02C7, 0x02C7), (0x02C9, 0x02CB),
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(0x02CD, 0x02CD), (0x02D0, 0x02D0), (0x02D8, 0x02DB),
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(0x02DD, 0x02DD), (0x02DF, 0x02DF), (0x0391, 0x03A1),
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(0x03A3, 0x03A9), (0x03B1, 0x03C1), (0x03C3, 0x03C9),
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(0x0401, 0x0401), (0x0410, 0x044F), (0x0451, 0x0451),
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(0x2010, 0x2010), (0x2013, 0x2016), (0x2018, 0x2019),
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(0x201C, 0x201D), (0x2020, 0x2022), (0x2024, 0x2027),
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(0x2030, 0x2030), (0x2032, 0x2033), (0x2035, 0x2035),
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(0x203B, 0x203B), (0x203E, 0x203E), (0x2074, 0x2074),
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(0x207F, 0x207F), (0x2081, 0x2084), (0x20AC, 0x20AC),
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(0x2103, 0x2103), (0x2105, 0x2105), (0x2109, 0x2109),
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(0x2113, 0x2113), (0x2116, 0x2116), (0x2121, 0x2122),
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(0x2126, 0x2126), (0x212B, 0x212B), (0x2153, 0x2154),
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(0x215B, 0x215E), (0x2160, 0x216B), (0x2170, 0x2179),
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(0x2190, 0x2199), (0x21B8, 0x21B9), (0x21D2, 0x21D2),
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(0x21D4, 0x21D4), (0x21E7, 0x21E7), (0x2200, 0x2200),
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(0x2202, 0x2203), (0x2207, 0x2208), (0x220B, 0x220B),
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(0x220F, 0x220F), (0x2211, 0x2211), (0x2215, 0x2215),
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(0x221A, 0x221A), (0x221D, 0x2220), (0x2223, 0x2223),
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(0x2225, 0x2225), (0x2227, 0x222C), (0x222E, 0x222E),
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(0x2234, 0x2237), (0x223C, 0x223D), (0x2248, 0x2248),
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(0x224C, 0x224C), (0x2252, 0x2252), (0x2260, 0x2261),
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(0x2264, 0x2267), (0x226A, 0x226B), (0x226E, 0x226F),
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(0x2282, 0x2283), (0x2286, 0x2287), (0x2295, 0x2295),
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(0x2299, 0x2299), (0x22A5, 0x22A5), (0x22BF, 0x22BF),
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(0x2312, 0x2312), (0x2460, 0x24E9), (0x24EB, 0x254B),
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(0x2550, 0x2573), (0x2580, 0x258F), (0x2592, 0x2595),
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(0x25A0, 0x25A1), (0x25A3, 0x25A9), (0x25B2, 0x25B3),
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(0x25B6, 0x25B7), (0x25BC, 0x25BD), (0x25C0, 0x25C1),
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(0x25C6, 0x25C8), (0x25CB, 0x25CB), (0x25CE, 0x25D1),
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(0x25E2, 0x25E5), (0x25EF, 0x25EF), (0x2605, 0x2606),
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(0x2609, 0x2609), (0x260E, 0x260F), (0x2614, 0x2615),
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(0x261C, 0x261C), (0x261E, 0x261E), (0x2640, 0x2640),
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(0x2642, 0x2642), (0x2660, 0x2661), (0x2663, 0x2665),
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(0x2667, 0x266A), (0x266C, 0x266D), (0x266F, 0x266F),
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(0x273D, 0x273D), (0x2776, 0x277F), (0xE000, 0xF8FF),
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(0xFFFD, 0xFFFD), (0xF0000, 0xFFFFD), (0x100000, 0x10FFFD)
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)
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def mk_wcwidth(ucs):
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# test for 8-bit control characters
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if ucs == 0:
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return 0
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if ucs < 32 or (ucs >= 0x7f and ucs < 0xa0):
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return -1
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# binary search in table of non-spacing characters
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if bisearch(ucs, combining):
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return 0
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# if we arrive here, ucs is not a combining or C0/C1 control character
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return 1 + int(
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ucs >= 0x1100
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and (ucs <= 0x115f # Hangul Jamo init. consonants
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or ucs == 0x2329 or ucs == 0x232a
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or (ucs >= 0x2e80 and ucs <= 0xa4cf
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and ucs != 0x303f) # CJK ... Yi
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or (ucs >= 0xac00 and ucs <= 0xd7a3) # Hangul Syllables
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or (ucs >= 0xf900 and ucs <= 0xfaff) # CJK Compatibility Ideographs
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or (ucs >= 0xfe10 and ucs <= 0xfe19) # Vertical forms
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or (ucs >= 0xfe30 and ucs <= 0xfe6f) # CJK Compatibility Forms
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or (ucs >= 0xff00 and ucs <= 0xff60) # Fullwidth Forms
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or (ucs >= 0xffe0 and ucs <= 0xffe6)
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or (ucs >= 0x20000 and ucs <= 0x2fffd)
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or (ucs >= 0x30000 and ucs <= 0x3fffd))
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)
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def mk_wcswidth(pwcs):
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width = 0
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for c in pwcs:
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w = mk_wcwidth(c)
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if w < 0:
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return -1
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else:
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width += w
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return width
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# The following functions are the same as mk_wcwidth() and
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# mk_wcswidth(), except that spacing characters in the East Asian
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# Ambiguous (A) category as defined in Unicode Technical Report #11
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# have a column width of 2. This variant might be useful for users of
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# CJK legacy encodings who want to migrate to UCS without changing
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# the traditional terminal character-width behaviour. It is not
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# otherwise recommended for general use.
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def mk_wcwidth_cjk(ucs):
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# binary search in table of non-spacing characters
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if bisearch(ucs, ambiguous):
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return 2
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return mk_wcwidth(ucs)
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def mk_wcswidth_cjk(pwcs):
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width = 0
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for c in pwcs:
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w = mk_wcwidth_cjk(c)
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if w < 0:
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return -1
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width += w
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return width
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# python-y versions, dealing with unicode objects
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def wcwidth(c):
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return mk_wcwidth(ord(c))
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def wcswidth(s):
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return mk_wcswidth(list(map(ord, s)))
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def wcwidth_cjk(c):
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return mk_wcwidth_cjk(ord(c))
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def wcswidth_cjk(s):
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return mk_wcswidth_cjk(list(map(ord, s)))
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if __name__ == "__main__":
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samples = (
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('MUSIC SHARP SIGN', 1),
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('FULLWIDTH POUND SIGN', 2),
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|
('FULLWIDTH LATIN CAPITAL LETTER P', 2),
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|
('CJK RADICAL BOLT OF CLOTH', 2),
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|
('LATIN SMALL LETTER A', 1),
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|
('LATIN SMALL LETTER AE', 1),
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|
('SPACE', 1),
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|
('NO-BREAK SPACE', 1),
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|
('CJK COMPATIBILITY IDEOGRAPH-F920', 2),
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|
('MALAYALAM VOWEL SIGN UU', 0),
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|
('ZERO WIDTH SPACE', 0),
|
|
('ZERO WIDTH NO-BREAK SPACE', 0),
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|
('COMBINING PALATALIZED HOOK BELOW', 0),
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|
('COMBINING GRAVE ACCENT', 0),
|
|
)
|
|
nonprinting = '\r\n\t\a\b\f\v\x7f'
|
|
|
|
import unicodedata
|
|
|
|
for name, printwidth in samples:
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|
uchr = unicodedata.lookup(name)
|
|
calculatedwidth = wcwidth(uchr)
|
|
assert calculatedwidth == printwidth, \
|
|
'width for %r should be %d, but is %d?' % (uchr, printwidth, calculatedwidth)
|
|
|
|
for c in nonprinting:
|
|
calculatedwidth = wcwidth(c)
|
|
assert calculatedwidth < 0, \
|
|
'%r is a control character, but wcwidth gives %d' % (c, calculatedwidth)
|
|
|
|
assert wcwidth('\0') == 0 # special case
|
|
|
|
# depending on how python is compiled, code points above U+FFFF may not be
|
|
# treated as single characters, so ord() won't work. test a few of these
|
|
# manually.
|
|
|
|
assert mk_wcwidth(0xe01ef) == 0
|
|
assert mk_wcwidth(0x10ffff) == 1
|
|
assert mk_wcwidth(0x3fffd) == 2
|
|
|
|
teststr = 'B\0ig br\u00f8wn moose\ub143\u200b'
|
|
calculatedwidth = wcswidth(teststr)
|
|
assert calculatedwidth == 17, 'expected 17, got %d' % calculatedwidth
|
|
|
|
calculatedwidth = wcswidth_cjk(teststr)
|
|
assert calculatedwidth == 18, 'expected 18, got %d' % calculatedwidth
|
|
|
|
assert wcswidth('foobar\u200b\a') < 0
|
|
|
|
print('tests pass.')
|