Re: [Groff] unicode support, part 11: \[sqrt] vs \(sr

[Werner LEMBERG]

> Does anyone see a difference between \[sqrt] and \(sr ?

`sr' is the text version, `sqrt' a mathematical symbol.

> groff_char.man has this:
> 
>        (N/A)   \[sr]        radical         u221A       square root +
>        (N/A)   \[sqrt]      radical         u221A       ***

Ah, I've just committed an explanation for the `***' marker (it
denotes a glyph for mathematical purposes; its glyph metrics makes it
not usable within normal text).

> +++ groff-20060217/font/devdvi/S
> @@ -132,6 +132,7 @@
>  \    "
>  u2240        291272,728178,203888    3       0157
>  sqrt 873816,41942,1006634    1       0160
> +sr   "

This is wrong.  The square root symbol from cmsy10 can't be used in
normal text!  tcrm1000 actually does contain a text version, but this
isn't covered in the EC stuff in devdvi (an omission, basically).

> +++ groff-20060217/src/libs/libgroff/glyphuni.cpp
> @@ -398,7 +398,8 @@
>    { "mi", "2212" },
>    { "-+", "2213" },
>    { "**", "2217" },
> -//{ "sqrt", "221A" },
> +  // \[sqrt] and \(sr are the same.
> +  { "sqrt", "221A" },
>    { "sr", "221A" },
>    { "pt", "221D" },
>    { "if", "221E" },

This is wrong too.  In glyphuni.cpp, a former entry with the same
Unicode value is overwritten by the latter one.  With other words, the
entry for `sqrt' would never be visible.


    Werner