Module: Banzai::ColorParser

Defined in:
lib/banzai/color_parser.rb

Constant Summary collapse

ALPHA =

0.0..1.0

/0(?:\.\d+)?|\.\d+|1(?:\.0+)?/
PERCENTS =

00%..100%

/(?:\d{1,2}|100)%/
ALPHA_CHANNEL = 
/(?:,\s*(?:#{ALPHA}|#{PERCENTS}))?/
BITS =

00..255

/\d{1,2}|1\d\d|2(?:[0-4]\d|5[0-5])/
DEGS =
-]digits[deg 
/-?\d+(?:deg)?/i
RADS =
-](digits[.digits

OR .digits)rad

/-?(?:\d+(?:\.\d+)?|\.\d+)rad/i
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

Class Method Summary collapse

Class Method Details

.parse(text) ⇒ Object

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.



42
43
44
 
# File 'lib/banzai/color_parser.rb', line 42

def self.parse(text)
  text if COLOR_FORMAT =~ text
end