bpo-30176: Add missing curses cell attributes constants (#2278)
diff --git a/Doc/library/curses.rst b/Doc/library/curses.rst
index f3d542c..7b56ad7 100644
--- a/Doc/library/curses.rst
+++ b/Doc/library/curses.rst
@@ -1234,27 +1234,63 @@
A string representing the current version of the module. Also available as
:const:`__version__`.
-Several constants are available to specify character cell attributes:
+Some constants are available to specify character cell attributes.
+The exact constants available are system dependent.
+------------------+-------------------------------+
| Attribute | Meaning |
+==================+===============================+
-| ``A_ALTCHARSET`` | Alternate character set mode. |
+| ``A_ALTCHARSET`` | Alternate character set mode |
+------------------+-------------------------------+
-| ``A_BLINK`` | Blink mode. |
+| ``A_BLINK`` | Blink mode |
+------------------+-------------------------------+
-| ``A_BOLD`` | Bold mode. |
+| ``A_BOLD`` | Bold mode |
+------------------+-------------------------------+
-| ``A_DIM`` | Dim mode. |
+| ``A_DIM`` | Dim mode |
+------------------+-------------------------------+
-| ``A_NORMAL`` | Normal attribute. |
+| ``A_INVIS`` | Invisible or blank mode |
++------------------+-------------------------------+
+| ``A_NORMAL`` | Normal attribute |
++------------------+-------------------------------+
+| ``A_PROTECT`` | Protected mode |
+------------------+-------------------------------+
| ``A_REVERSE`` | Reverse background and |
-| | foreground colors. |
+| | foreground colors |
+------------------+-------------------------------+
-| ``A_STANDOUT`` | Standout mode. |
+| ``A_STANDOUT`` | Standout mode |
+------------------+-------------------------------+
-| ``A_UNDERLINE`` | Underline mode. |
+| ``A_UNDERLINE`` | Underline mode |
++------------------+-------------------------------+
+| ``A_HORIZONTAL`` | Horizontal highlight |
++------------------+-------------------------------+
+| ``A_LEFT`` | Left highlight |
++------------------+-------------------------------+
+| ``A_LOW`` | Low highlight |
++------------------+-------------------------------+
+| ``A_RIGHT`` | Right highlight |
++------------------+-------------------------------+
+| ``A_TOP`` | Top highlight |
++------------------+-------------------------------+
+| ``A_VERTICAL`` | Vertical highlight |
++------------------+-------------------------------+
+| ``A_CHARTEXT`` | Bit-mask to extract a |
+| | character |
++------------------+-------------------------------+
+
+Several constants are available to extract corresponding attributes returned
+by some methods.
+
++------------------+-------------------------------+
+| Bit-mask | Meaning |
++==================+===============================+
+| ``A_ATTRIBUTES`` | Bit-mask to extract |
+| | attributes |
++------------------+-------------------------------+
+| ``A_CHARTEXT`` | Bit-mask to extract a |
+| | character |
++------------------+-------------------------------+
+| ``A_COLOR`` | Bit-mask to extract |
+| | color-pair field information |
+------------------+-------------------------------+
Keys are referred to by integer constants with names starting with ``KEY_``.