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# frozen_string_literal: true
module Banzai
module ColorParser
ALPHA = /0(?:\.\d+)?|\.\d+|1(?:\.0+)?/.freeze # 0.0..1.0
PERCENTS = /(?:\d{1,2}|100)%/.freeze # 00%..100%
ALPHA_CHANNEL = /(?:,\s*(?:#{ALPHA}|#{PERCENTS}))?/.freeze
BITS = /\d{1,2}|1\d\d|2(?:[0-4]\d|5[0-5])/.freeze # 00..255
DEGS = /-?\d+(?:deg)?/i.freeze # [-]digits[deg]
RADS = /-?(?:\d+(?:\.\d+)?|\.\d+)rad/i.freeze # [-](digits[.digits] OR .digits)rad
HEX_FORMAT = /\#(?:\h{3}|\h{4}|\h{6}|\h{8})/.freeze
RGB_FORMAT = %r{
(?:rgba?
\(
(?:
(?:(?:#{BITS},\s*){2}#{BITS})
|
(?:(?:#{PERCENTS},\s*){2}#{PERCENTS})
)
#{ALPHA_CHANNEL}
\)
)
}xi.freeze
HSL_FORMAT = %r{
(?:hsla?
\(
(?:#{DEGS}|#{RADS}),\s*#{PERCENTS},\s*#{PERCENTS}
#{ALPHA_CHANNEL}
\)
)
}xi.freeze
FORMATS = [HEX_FORMAT, RGB_FORMAT, HSL_FORMAT].freeze
COLOR_FORMAT = /\A(#{Regexp.union(FORMATS)})\z/ix.freeze
# 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 =~ text
end
end
end
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