Re: master 6eeab90632: Don't accept whitespace or hex floats in rgbi: colour specs

[Po Lu]

Philip Kaludercic <philipk@posteo.net> writes:

> It seems the "rgbi" (that stands for RGB Intensity) syntax comes from
> X11[0], specifically "XCMS" (X Color Management System) Interestingly
> enough, if you look around you can find that the "rgbi" prefix seems
> to be case-insensitive[1], while `color-values-from-color-spec' is not:
>
>     (color-values-from-color-spec "rgbi:0/0/0") ;; => (0 0 0)
>     (color-values-from-color-spec "rgbI:0/0/0") ;; => nil
>     (color-values-from-color-spec "RGBi:0/0/0") ;; => nil
>     (color-values-from-color-spec "RGBI:0/0/0") ;; => nil
>
> The closes thing to a specification I could find was [2], that says:
>
>         1.3.2.2.  RGB Intensity       String Specification
>
>         An RGB intensity specification in the form of a       string is
>         identified by the prefix "rgbi:" and whose string conforms
>         to the following syntax:
>
>             rgbi:<red>/<green>/<blue>
>
>         Where red, green, and blue are floating       point values between
>         0.0 and       1.0, inclusive.  The input format for these values
>         is an optional sign, a string of numbers possibly containing
>         a decimal point, and an       optional exponent field containing
>         an E or       e followed by a possibly signed integer string.

See my reply to Mattias, that's not the RGBi specification I'm talking
about.