gh-152219: Add curses window attribute get/set methods and WA_* constants#152221
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serhiy-storchaka merged 2 commits intoJun 26, 2026
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… constants Add the window methods attr_get(), attr_set(), attr_on(), attr_off() and color_set(), wrapping wattr_get(), wattr_set(), wattr_on(), wattr_off() and wcolor_set(). Unlike the legacy attron()/attroff()/attrset() methods, these pass the color pair as a separate argument instead of packing it into the attribute value. Also add the corresponding WA_* attribute constants. Add an attr_converter that range-checks the attr_t attribute argument and raises OverflowError instead of silently truncating it; apply it to attr_set(), attr_on(), attr_off() and chgat(). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Documentation build overview
4 files changed± library/curses.html± library/stdtypes.html± whatsnew/3.16.html± whatsnew/changelog.html |
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Add the
curseswindow methodsattr_get(),attr_set(),attr_on(),attr_off()andcolor_set(), wrappingwattr_get(),wattr_set(),wattr_on(),wattr_off()andwcolor_set().Unlike the legacy
attron()/attroff()/attrset()methods, which take achtypewith the color pair packed in viaCOLOR_PAIR(), these pass the color pair as a separate argument. This is the form used internally by thecchar_t-based wide-character output, and it can address color pairs beyond 255 without colliding with the attribute bits.Also add the corresponding
WA_*attribute constants (WA_NORMAL,WA_BOLD,WA_UNDERLINE,WA_REVERSE,WA_BLINK,WA_DIM,WA_STANDOUT,WA_ALTCHARSET,WA_INVIS,WA_PROTECT,WA_ITALICand the placement constants), each guarded by#ifdef. On ncurses they are bit-identical to the matchingA_*values.This PR adds an
attr_converterthat range-checks theattr_targument and raisesOverflowErrorinstead of silently truncating; it is applied toattr_set(),attr_on(),attr_off()andchgat(). A converter for thechtype-style methods (addch,bkgd,hline, etc.) is left for a separate issue.