1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
# frozen_string_literal: true
module Banzai
module ColorParser
ALPHA = /0(?:\.\d+)?|\.\d+|1(?:\.0+)?/ # 0.0..1.0
PERCENTS = /(?:\d{1,2}|100)%/ # 00%..100%
ALPHA_CHANNEL = /(?:,\s*(?:#{ALPHA}|#{PERCENTS}))?/
BITS = /\d{1,2}|1\d\d|2(?:[0-4]\d|5[0-5])/ # 00..255
DEGS = /-?\d+(?:deg)?/i # [-]digits[deg]
RADS = /-?(?:\d+(?:\.\d+)?|\.\d+)rad/i # [-](digits[.digits] OR .digits)rad
HEX_FORMAT = /\#(?:\h{3}|\h{4}|\h{6}|\h{8})/
RGB_FORMAT = %r{
(?:rgba?
\(
(?:
(?:(?:#{BITS},\s*){2}#{BITS})
|
(?:(?:#{PERCENTS},\s*){2}#{PERCENTS})
)
#{ALPHA_CHANNEL}
\)
)
}xi
HSL_FORMAT = %r{
(?:hsla?
\(
(?:#{DEGS}|#{RADS}),\s*#{PERCENTS},\s*#{PERCENTS}
#{ALPHA_CHANNEL}
\)
)
}xi
FORMATS = [HEX_FORMAT, RGB_FORMAT, HSL_FORMAT].freeze
COLOR_FORMAT = /\A(#{Regexp.union(FORMATS)})\z/ix
# Public: Analyzes whether the String is a color code.
#
# text - The String to be parsed.
#
# Returns the recognized color String or nil if none was found.
def self.parse(text)
text if COLOR_FORMAT.match?(text)
end
end
end
|
