Properly take into account the length of the characters, fixing
some display issues (for example the cursor position when entering stranges characters likes 癔)
This commit is contained in:
Florent Le Coz
parent
2f864c9fc1
commit
0d6ec6c5d3
2 changed files with 342 additions and 21 deletions
316
src/wcwidth.py
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316
src/wcwidth.py
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@ -0,0 +1,316 @@
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#/usr/bin/env python
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# -*- encoding: utf-8
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"""
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* This is a Python implementation of wcwidth() and wcswidth(), based on the
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* C implementation of the same functions (defined in IEEE Std 1002.1-2001)
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* 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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* Berteun Damman - 2007-06-28 (Python version)
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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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"""
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# auxiliary function for binary search in interval table, see below
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def bisearch(ucs):
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mn = 0
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mx = len(combining_table) - 1
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if ucs < combining_table[0][0] or ucs > combining_table[mx][1]:
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return False
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while mx >= mn:
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mid = (mn + mx) // 2
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if ucs > combining_table[mid][1]:
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mn = mid + 1
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elif ucs < combining_table[mid][0]:
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mx = mid - 1
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else:
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return True
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return False
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"""
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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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"""
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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_table = [
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('\u0300', '\u036F'), ('\u0483', '\u0486'), ('\u0488', '\u0489'),
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('\u0591', '\u05BD'), ('\u05BF', '\u05BF'), ('\u05C1', '\u05C2'),
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('\u05C4', '\u05C5'), ('\u05C7', '\u05C7'), ('\u0600', '\u0603'),
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('\u0610', '\u0615'), ('\u064B', '\u065E'), ('\u0670', '\u0670'),
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('\u06D6', '\u06E4'), ('\u06E7', '\u06E8'), ('\u06EA', '\u06ED'),
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('\u070F', '\u070F'), ('\u0711', '\u0711'), ('\u0730', '\u074A'),
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('\u07A6', '\u07B0'), ('\u07EB', '\u07F3'), ('\u0901', '\u0902'),
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('\u093C', '\u093C'), ('\u0941', '\u0948'), ('\u094D', '\u094D'),
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('\u0951', '\u0954'), ('\u0962', '\u0963'), ('\u0981', '\u0981'),
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('\u09BC', '\u09BC'), ('\u09C1', '\u09C4'), ('\u09CD', '\u09CD'),
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('\u09E2', '\u09E3'), ('\u0A01', '\u0A02'), ('\u0A3C', '\u0A3C'),
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('\u0A41', '\u0A42'), ('\u0A47', '\u0A48'), ('\u0A4B', '\u0A4D'),
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('\u0A70', '\u0A71'), ('\u0A81', '\u0A82'), ('\u0ABC', '\u0ABC'),
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('\u0AC1', '\u0AC5'), ('\u0AC7', '\u0AC8'), ('\u0ACD', '\u0ACD'),
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('\u0AE2', '\u0AE3'), ('\u0B01', '\u0B01'), ('\u0B3C', '\u0B3C'),
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('\u0B3F', '\u0B3F'), ('\u0B41', '\u0B43'), ('\u0B4D', '\u0B4D'),
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('\u0B56', '\u0B56'), ('\u0B82', '\u0B82'), ('\u0BC0', '\u0BC0'),
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('\u0BCD', '\u0BCD'), ('\u0C3E', '\u0C40'), ('\u0C46', '\u0C48'),
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('\u0C4A', '\u0C4D'), ('\u0C55', '\u0C56'), ('\u0CBC', '\u0CBC'),
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('\u0CBF', '\u0CBF'), ('\u0CC6', '\u0CC6'), ('\u0CCC', '\u0CCD'),
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('\u0CE2', '\u0CE3'), ('\u0D41', '\u0D43'), ('\u0D4D', '\u0D4D'),
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('\u0DCA', '\u0DCA'), ('\u0DD2', '\u0DD4'), ('\u0DD6', '\u0DD6'),
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('\u0E31', '\u0E31'), ('\u0E34', '\u0E3A'), ('\u0E47', '\u0E4E'),
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('\u0EB1', '\u0EB1'), ('\u0EB4', '\u0EB9'), ('\u0EBB', '\u0EBC'),
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('\u0EC8', '\u0ECD'), ('\u0F18', '\u0F19'), ('\u0F35', '\u0F35'),
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('\u0F37', '\u0F37'), ('\u0F39', '\u0F39'), ('\u0F71', '\u0F7E'),
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('\u0F80', '\u0F84'), ('\u0F86', '\u0F87'), ('\u0F90', '\u0F97'),
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('\u0F99', '\u0FBC'), ('\u0FC6', '\u0FC6'), ('\u102D', '\u1030'),
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('\u1032', '\u1032'), ('\u1036', '\u1037'), ('\u1039', '\u1039'),
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('\u1058', '\u1059'), ('\u1160', '\u11FF'), ('\u135F', '\u135F'),
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('\u1712', '\u1714'), ('\u1732', '\u1734'), ('\u1752', '\u1753'),
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('\u1772', '\u1773'), ('\u17B4', '\u17B5'), ('\u17B7', '\u17BD'),
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('\u17C6', '\u17C6'), ('\u17C9', '\u17D3'), ('\u17DD', '\u17DD'),
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('\u180B', '\u180D'), ('\u18A9', '\u18A9'), ('\u1920', '\u1922'),
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('\u1927', '\u1928'), ('\u1932', '\u1932'), ('\u1939', '\u193B'),
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('\u1A17', '\u1A18'), ('\u1B00', '\u1B03'), ('\u1B34', '\u1B34'),
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('\u1B36', '\u1B3A'), ('\u1B3C', '\u1B3C'), ('\u1B42', '\u1B42'),
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('\u1B6B', '\u1B73'), ('\u1DC0', '\u1DCA'), ('\u1DFE', '\u1DFF'),
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('\u200B', '\u200F'), ('\u202A', '\u202E'), ('\u2060', '\u2063'),
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('\u206A', '\u206F'), ('\u20D0', '\u20EF'), ('\u302A', '\u302F'),
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('\u3099', '\u309A'), ('\uA806', '\uA806'), ('\uA80B', '\uA80B'),
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('\uA825', '\uA826'), ('\uFB1E', '\uFB1E'), ('\uFE00', '\uFE0F'),
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('\uFE20', '\uFE23'), ('\uFEFF', '\uFEFF'), ('\uFFF9', '\uFFFB'),
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]
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# XXX: There are some issues with Plane 1 Unicode characters on 32-bit
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# systems. As these use UTF-16 internally they will use surrogate pairs
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# to represent the character. I don't know how this works exactly though,
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# therefore, until I've figured it out, if we're on a 32-bit system,
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# we won't include these, otherwise we will.
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if '\U0000FFFF' < '\U00010000':
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combining_table.extend([
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('\U00010A01', '\U00010A03'), ('\U00010A05', '\U00010A06'),
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('\U00010A0C', '\U00010A0F'), ('\U00010A38', '\U00010A3A'),
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('\U00010A3F', '\U00010A3F'), ('\U0001D167', '\U0001D169'),
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('\U0001D173', '\U0001D182'), ('\U0001D185', '\U0001D18B'),
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('\U0001D1AA', '\U0001D1AD'), ('\U0001D242', '\U0001D244'),
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('\U000E0001', '\U000E0001'), ('\U000E0020', '\U000E007F'),
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('\U000E0100', '\U000E01EF'),
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])
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def wcwidth(ucs):
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if len(ucs) > 1:
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raise TypeError('wcwidth() expected a character, '
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'but string of length %d found' % (len(ucs),))
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# test for 8-bit control characters
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if ucs == '\u0000':
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return 0
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# non-printable chars.
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if ucs < '\u0020' or (ucs >= '\u007f' and ucs < '\u00a0'):
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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):
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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 +
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(ucs >= '\u1100' and
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(ucs <= '\u115f' or # Hangul Jamo init. consonants
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ucs == '\u2329' or ucs == '\u232a' or
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(ucs >= '\u2e80' and ucs <= '\ua4cf' and
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ucs != '\u303f') or # CJK ... Yi
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(ucs >= '\uac00' and ucs <= '\ud7a3') or # Hangul Syllables
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(ucs >= '\uf900' and ucs <= '\ufaff') or # CJK Comp. Ideographs
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(ucs >= '\ufe10' and ucs <= '\ufe19') or # Vertical forms
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(ucs >= '\ufe30' and ucs <= '\ufe6f') or # CJK Comp. Forms
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(ucs >= '\uff00' and ucs <= '\uff60') or # Fullwidth Forms
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(ucs >= '\uffe0' and ucs <= '\uffe6') or
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# XXX: '\U0000FFFF' < '\U00010000' is only True on 64-bit systems.
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# On 32 bit systems it fails, but hopefully it won't cause chars to be
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# misrepresented. It has to do with surrogate pairs, but I don't know
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# how to fix this.
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(('\U0000FFFF' < '\U00010000') and
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(ucs >= '\U00020000' and ucs <= '\U0002fffd') or
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(ucs >= '\U00030000' and ucs <= '\U0003fffd')))))
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def wcswidth(s):
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"""
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Return the length of the passed string, using wcwidth on each char
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instead of couting 1 for each one.
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"""
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width = 0
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for c in s:
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w = wcwidth(c)
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if w < 0:
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# If s contains a non-printable char, we should return -1.
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# This includes newlines and tabs!
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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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def widthcut(s, m):
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"""
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Return the first characters of s that can be contained in
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a m length
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"""
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i = 0
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width = 0
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for c in s:
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w = wcwidth(c)
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if w < 0:
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return None
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else:
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width += w
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i += 1
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if width > m:
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return s[:i-1]
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return s
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def ljust(s, max, fillchar=" "):
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"""
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Like widthcut but adding chars at the end of the string until
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max is reached
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"""
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if wcwidth(fillchar)!=1:
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raise TypeError('widthpad() expected fillchar as a character, '
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'but string of length %d found' % (len(fillchar),))
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i = 0
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width = 0
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for c in s:
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w = wcwidth(c)
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if w < 0:
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return None
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else:
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width += w
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i += 1
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if width==max:
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return s[:i]
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if width > max:
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return s[:i-1]+fillchar
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return s + fillchar*(max-width)
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def rjust(s, max, fillchar=" "):
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if wcwidth(fillchar)!=1:
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raise TypeError('widthpad() expected fillchar as a character, '
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'but string of length %d found' % (len(fillchar),))
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i = 0
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width = 0
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for c in s:
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w = wcwidth(c)
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if w < 0:
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return None
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else:
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width += w
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i += 1
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if width==max:
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return s[:i]
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if width > max:
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return fillchar+s[:i-1]
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return fillchar*(max-width) + s
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if __name__ == '__main__':
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import unicodedata
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test_strings = [
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'Pál Erdős', 'Kurt Gödel', 'Évariste Galois',
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"Guillaume de l'Hôpital",
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'ἄνδρα μοι ἔννεπε, μοῦσα, πολύτροπον, ὃς μάλα πολλὰ πλάγχθη',
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]
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for s in test_strings:
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# d will be the decomposed version, this one should have the
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# same display width, but it should have more characters.
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d = unicodedata.normalize('NFD', s)
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assert wcswidth(s) == wcswidth(d)
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assert len(s) != len(d)
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assert wcswidth('string with \n char') == -1
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assert wcswidth('string with \t char') == -1
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print('Minor testcase succeeded')
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@ -48,6 +48,7 @@ from sleekxmpp.xmlstream.stanzabase import JID
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import theme
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import common
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import wcwidth
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g_lock = Lock()
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@ -391,10 +392,8 @@ class MucInfoWin(InfoWin):
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self._refresh()
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def write_room_name(self, room):
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"""
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"""
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self.addstr('[', common.curses_color_pair(theme.COLOR_INFORMATION_BAR))
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self.addnstr(room.name, len(room.name), common.curses_color_pair(theme.COLOR_GROUPCHAT_NAME))
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self.addstr(room.name, common.curses_color_pair(theme.COLOR_GROUPCHAT_NAME))
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self.addstr('] ', common.curses_color_pair(theme.COLOR_INFORMATION_BAR))
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def write_disconnected(self, room):
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@ -491,23 +490,27 @@ class TextWin(Win):
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txt = message.txt
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if not txt:
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return 0
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else:
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txt = txt.replace('\t', ' ')
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# length of the time
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offset = 9+len(theme.CHAR_TIME_LEFT[:1])+len(theme.CHAR_TIME_RIGHT[:1])
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if message.nickname and len(message.nickname) >= 30:
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nick = message.nickname[:30]+'…'
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if message.nickname and wcwidth.wcswidth(message.nickname) >= 25:
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nick = message.nickname[:25]+'…'
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else:
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nick = message.nickname
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if nick:
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offset += len(nick) + 2 # + nick + spaces length
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offset += wcwidth.wcswidth(nick) + 2 # + nick + spaces length
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first = True
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this_line_was_broken_by_space = False
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nb = 0
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while txt != '':
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limit = txt[:self.width-offset].find('\n')
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cutted_txt = wcwidth.widthcut(txt, self.width-offset) or txt[:self.width-offset]
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limit = cutted_txt.find('\n')
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if limit < 0:
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# break between words if possible
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if len(txt) >= self.width-offset:
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limit = txt[:self.width-offset].rfind(' ')
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if wcwidth.wcswidth(txt) >= self.width-offset:
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cutted_txt = wcwidth.widthcut(txt, self.width-offset) or txt[:self.width-offset]
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limit = cutted_txt.rfind(' ')
|
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this_line_was_broken_by_space = True
|
||||
if limit <= 0:
|
||||
limit = self.width-offset
|
||||
|
|
@ -528,15 +531,18 @@ class TextWin(Win):
|
|||
}
|
||||
l = Line(nick, color,
|
||||
time,
|
||||
txt[:limit], message.color,
|
||||
wcwidth.widthcut(txt, limit) or txt[:limit], message.color,
|
||||
offset,
|
||||
message.colorized)
|
||||
self.built_lines.append(l)
|
||||
nb += 1
|
||||
if this_line_was_broken_by_space:
|
||||
txt = txt[limit+1:] # jump the space at the start of the line
|
||||
else:
|
||||
limit += 1 # jump the space at the start of the line
|
||||
cutted_txt = wcwidth.widthcut(txt, limit)
|
||||
if not cutted_txt:
|
||||
txt = txt[limit:]
|
||||
else:
|
||||
txt = txt[len(cutted_txt):]
|
||||
if txt.startswith('\n'):
|
||||
txt = txt[1:]
|
||||
first = False
|
||||
|
|
@ -567,13 +573,11 @@ class TextWin(Win):
|
|||
if line.nickname:
|
||||
self.write_nickname(line.nickname, line.nickname_color)
|
||||
self.write_text(y, line.text_offset, line.text, line.text_color, line.colorized)
|
||||
if y != self.height-1 or (not line or line.text_offset+len(line.text) < self.width):
|
||||
if y != self.height-1 or (not line or line.text_offset+wcwidth.wcswidth(line.text) < self.width):
|
||||
self.addstr('\n')
|
||||
self._refresh()
|
||||
|
||||
def write_line_separator(self):
|
||||
"""
|
||||
"""
|
||||
self.addnstr('- '*(self.width//2-1)+'-', self.width, common.curses_color_pair(theme.COLOR_NEW_TEXT_SEPARATOR))
|
||||
|
||||
def write_text(self, y, x, txt, color, colorized):
|
||||
|
|
@ -603,7 +607,7 @@ class TextWin(Win):
|
|||
.replace('"(', '').replace(')"', '')
|
||||
splitted = txt.split()
|
||||
for word in splitted:
|
||||
if word in list(special_words.keys()):
|
||||
if word in special_words.keys():
|
||||
self.addstr(word, common.curses_color_pair(special_words[word]))
|
||||
elif word.startswith('(') and word.endswith(')'):
|
||||
self.addstr('(', common.curses_color_pair(color))
|
||||
|
|
@ -1000,9 +1004,9 @@ class Input(Win):
|
|||
self.text = self.text[:self.pos+self.line_pos]+key+self.text[self.pos+self.line_pos:]
|
||||
(y, x) = self._win.getyx()
|
||||
if x == self.width-1:
|
||||
self.line_pos += len(key)
|
||||
self.line_pos += 1 # wcwidth.wcswidth(key)
|
||||
else:
|
||||
self.pos += len(key)
|
||||
self.pos += 1 # wcwidth.wcswidth(key)
|
||||
if reset:
|
||||
self.rewrite_text()
|
||||
if self.on_input:
|
||||
|
|
@ -1030,12 +1034,13 @@ class Input(Win):
|
|||
self._win.erase()
|
||||
if self.color:
|
||||
self._win.attron(common.curses_color_pair(self.color))
|
||||
self.addstr(text[self.line_pos:self.line_pos+self.width-1])
|
||||
displayed_text = text[self.line_pos:self.line_pos+self.width-1]
|
||||
self.addstr(displayed_text)
|
||||
if self.color:
|
||||
(y, x) = self._win.getyx()
|
||||
size = self.width-x
|
||||
self.addnstr(' '*size, size, common.curses_color_pair(self.color))
|
||||
self.addstr(0, self.pos, '') # WTF, this works but .move() doesn't…
|
||||
self.addstr(0, wcwidth.wcswidth(displayed_text[:self.pos]), '')
|
||||
if self.color:
|
||||
self._win.attroff(common.curses_color_pair(self.color))
|
||||
self._refresh()
|
||||
|
|
|
|||
Loading…
Reference in a new issue