gh-151757: Support wide and combining characters in the curses module#151758
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gh-151757: Support wide and combining characters in the curses module#151758serhiy-storchaka wants to merge 1 commit into
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…module The character-cell window methods now accept a full character cell -- a spacing character optionally followed by combining characters (up to CCHARW_MAX wide characters) -- in addition to a single int or byte character. This affects addch(), bkgd(), bkgdset(), border(), box(), echochar(), hline(), insch() and vline(); they dispatch to the ncursesw wide-character functions (wadd_wch(), wbkgrnd(), wborder_set(), wecho_wchar(), whline_set(), wins_wch(), wvline_set(), ...) when given a string. border() and box() cannot mix integer or byte characters with wide string characters in a single call. A cell is one spacing character optionally followed by combining characters, so an extra spacing or control character (such as "ab") is rejected with ValueError rather than being silently truncated by setcchar(). Also add the wide-character read methods get_wstr() and in_wstr(), the counterparts of getstr() and instr() that return a str rather than a bytes object, and the module functions erasewchar(), killwchar() and wunctrl(), the wide-character counterparts of erasechar(), killchar() and unctrl(). All of this is available only when built against the wide-character ncursesw library. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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The character-cell window methods now accept a full character cell -- a spacing character optionally followed by combining characters (up to
CCHARW_MAXwide characters) -- in addition to a singleintor byte character. This affectsaddch(),bkgd(),bkgdset(),border(),box(),echochar(),hline(),insch()andvline(), which dispatch to the ncursesw wide-character functions (wadd_wch(),wbkgrnd(),wborder_set(),wecho_wchar(),whline_set(),wins_wch(),wvline_set(), ...) when given a string.border()andbox()cannot mix integer or byte characters with wide-string characters in a single call.A cell is one spacing character optionally followed by combining characters, so an extra spacing or control character (for example
"ab", an emoji ZWJ sequence, or an emoji with a skin-tone modifier) is rejected withValueErrorrather than being silently truncated bysetcchar(). A single control character is still accepted (curses applies its usual control processing, e.g. backspace, tab and carriage return).Also added are the wide-character read methods
window.get_wstr()andwindow.in_wstr(), the counterparts ofwindow.getstr()andwindow.instr()that return astrrather thanbytes, and the module functionscurses.erasewchar(),curses.killwchar()andcurses.wunctrl(), the wide-character counterparts ofcurses.erasechar(),curses.killchar()andcurses.unctrl().All of this is available only when built against the wide-character ncursesw library.
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