Fractional percentage notation in color parser

[kimikage]

The color parser has only accepted integer percentages since Color.jl was separated from Compose.jl.(cf. 6738401)

julia> colorant"rgb(100%,50%,0%)"
RGB{N0f8}(1.0,0.502,0.0)

julia> colorant"rgb(100%,50%,3.14%)"
ERROR: LoadError: Unknown color: rgb(100%,50%,3.14%)

This is practical enough as long as the users write the percentages with @colorant_str. So I added the specification to the document in PR #406.

However, other programs may generate a fractional decimal percentage.For example, https://github.com/JuliaLang/julia-logo-graphics/blame/168fb6c1164e341df360ed6ced519e1e0cb7de3a/images/julia-logo-color.svg.

I do never intend to make the parser fully CSS compliant, but I'd like to remove the restriction.

[kimikage]

Julia v1.5 will be released soon, so I'd like to "cancel" the deprecation warning.

Colors.jl/src/parse.jl

Lines 143 to 147 in 53c2acb

	Base.depwarn(
	"""
	The X11 color names with spaces are not recommended because they are not allowed in the SVG/CSS.
	Use "$camel" or "$wo_spaces" instead.
	""", :parse)

Instead, in Colors v0.13 I'll add a deprecation warning to:

Colors.jl/src/parse.jl

Line 212 in 53c2acb

Base.parse(::Type{C}, c::Colorant) where {C<:Colorant} = c

(cf. #406 (comment))

[timholy]

So by "cancel," do you mean "turn the warning into an error" or something else?

I agree with adding a depwarn to that method in Colors. But there's no conservation of depwarns, you can have as many as you want 😄.

[kimikage]

I'm thinking about purely removing the five lines of depwarn above, leaving the note in the docstring. (cf. #419)

[kimikage]

you can have as many as you want 😄.

Yes. I think FixedPointNumbers/ColorTypes/ColorVectorSpace are starting to move towards the next minor (not patch) level updates. I'm just trying to enumerate the (trivial) fixes to piggyback on the update.