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|
module Color exposing (parse)
import Bitwise exposing (shiftLeftBy)
import Parser exposing ((|.), (|=), Parser, backtrackable, end, keyword, oneOf, spaces, succeed, symbol)
type alias Color =
{ r : Int, g : Int, b : Int, a : Float }
parser : Parser Color
parser =
oneOf
[ keywords
, hsla
, rgba
, hex
]
|. end
hexNumber =
Parser.number
{ int = Nothing
, hex = Just identity
, octal = Nothing
, binary = Nothing
, float = Nothing
}
hexDigit : Parser Int
hexDigit =
oneOf
[ succeed 0 |. symbol "0"
, succeed 1 |. symbol "1"
, succeed 2 |. symbol "2"
, succeed 3 |. symbol "3"
, succeed 4 |. symbol "4"
, succeed 5 |. symbol "5"
, succeed 6 |. symbol "6"
, succeed 7 |. symbol "7"
, succeed 8 |. symbol "8"
, succeed 9 |. symbol "9"
, succeed 10 |. symbol "A"
, succeed 11 |. symbol "B"
, succeed 12 |. symbol "C"
, succeed 13 |. symbol "D"
, succeed 14 |. symbol "E"
, succeed 15 |. symbol "F"
, succeed 10 |. symbol "a"
, succeed 11 |. symbol "b"
, succeed 12 |. symbol "c"
, succeed 13 |. symbol "d"
, succeed 14 |. symbol "e"
, succeed 15 |. symbol "f"
]
twoDigits : Int -> Int -> Int
twoDigits a b =
Bitwise.shiftLeftBy 4 a + b
hex : Parser Color
hex =
succeed
(\a b c maybe ->
case maybe of
Just ( d, e, f ) ->
{ r = twoDigits a b
, g = twoDigits c d
, b = twoDigits e f
, a = 1
}
Nothing ->
{ r = twoDigits a a
, g = twoDigits b b
, b = twoDigits c c
, a = 1
}
)
|. symbol "#"
|= hexDigit
|= hexDigit
|= hexDigit
|= oneOf
[ succeed (\a b c -> Just ( a, b, c ))
|= hexDigit
|= hexDigit
|= hexDigit
, succeed Nothing
]
rgba : Parser Color
rgba =
succeed Color
|. oneOf [ keyword "rgba", keyword "rgb" ]
|. symbol "("
|= Parser.int
|. spaces
|. symbol ","
|. spaces
|= Parser.int
|. spaces
|. symbol ","
|. spaces
|= Parser.int
|= oneOf
[ succeed identity
|. symbol ","
|. spaces
|= Parser.float
, succeed 1
]
|. symbol ")"
fromHSLA hue sat light alpha =
let
( h, s, l ) =
( toFloat hue / 360, toFloat sat / 100, toFloat light / 100 )
m2 =
if l <= 0.5 then
l * (s + 1)
else
l + s - l * s
m1 =
l * 2 - m2
r =
hueToRgb (h + 1 / 3)
g =
hueToRgb h
b =
hueToRgb (h - 1 / 3)
hueToRgb h__ =
let
h_ =
if h__ < 0 then
h__ + 1
else if h__ > 1 then
h__ - 1
else
h__
in
if h_ * 6 < 1 then
m1 + (m2 - m1) * h_ * 6
else if h_ * 2 < 1 then
m2
else if h_ * 3 < 2 then
m1 + (m2 - m1) * (2 / 3 - h_) * 6
else
m1
in
Color (r * 255 |> floor) (g * 255 |> floor) (b * 255 |> floor) alpha
hsla : Parser Color
hsla =
succeed fromHSLA
|. oneOf [ keyword "hsla", keyword "hsl" ]
|. symbol "("
|= angle
|. spaces
|. symbol ","
|. spaces
|= percentage
|. spaces
|. symbol ","
|. spaces
|= percentage
|= oneOf
[ succeed identity
|. symbol ","
|. spaces
|= Parser.float
, succeed 1
]
|. symbol ")"
angle =
Parser.map round Parser.float
percentage =
Parser.map round Parser.float
|. symbol "%"
fromHexString : String -> Parser Color
fromHexString hexString =
case String.toList hexString of
[ '#', r, g, b ] ->
fromHex8 ( r, r ) ( g, g ) ( b, b ) ( 'f', 'f' )
[ r, g, b ] ->
fromHex8 ( r, r ) ( g, g ) ( b, b ) ( 'f', 'f' )
[ '#', r, g, b, a ] ->
fromHex8 ( r, r ) ( g, g ) ( b, b ) ( a, a )
[ r, g, b, a ] ->
fromHex8 ( r, r ) ( g, g ) ( b, b ) ( a, a )
[ '#', r1, r2, g1, g2, b1, b2 ] ->
fromHex8 ( r1, r2 ) ( g1, g2 ) ( b1, b2 ) ( 'f', 'f' )
[ r1, r2, g1, g2, b1, b2 ] ->
fromHex8 ( r1, r2 ) ( g1, g2 ) ( b1, b2 ) ( 'f', 'f' )
[ '#', r1, r2, g1, g2, b1, b2, a1, a2 ] ->
fromHex8 ( r1, r2 ) ( g1, g2 ) ( b1, b2 ) ( a1, a2 )
[ r1, r2, g1, g2, b1, b2, a1, a2 ] ->
fromHex8 ( r1, r2 ) ( g1, g2 ) ( b1, b2 ) ( a1, a2 )
_ ->
Parser.problem "Invalid color"
maybeToParser : Maybe a -> Parser a
maybeToParser aMaybe =
case aMaybe of
Just a ->
succeed a
Nothing ->
Parser.problem "something went wrong"
fromHex8 : ( Char, Char ) -> ( Char, Char ) -> ( Char, Char ) -> ( Char, Char ) -> Parser Color
fromHex8 ( r1, r2 ) ( g1, g2 ) ( b1, b2 ) ( a1, a2 ) =
Maybe.map4
(\r g b a ->
Color
r
g
b
(toFloat a / 255)
)
(hex2ToInt r1 r2)
(hex2ToInt g1 g2)
(hex2ToInt b1 b2)
(hex2ToInt a1 a2)
|> maybeToParser
hex2ToInt : Char -> Char -> Maybe Int
hex2ToInt c1 c2 =
Maybe.map2 (\v1 v2 -> shiftLeftBy 4 v1 + v2) (hexToInt c1) (hexToInt c2)
hexToInt : Char -> Maybe Int
hexToInt char =
case Char.toLower char of
'0' ->
Just 0
'1' ->
Just 1
'2' ->
Just 2
'3' ->
Just 3
'4' ->
Just 4
'5' ->
Just 5
'6' ->
Just 6
'7' ->
Just 7
'8' ->
Just 8
'9' ->
Just 9
'a' ->
Just 10
'b' ->
Just 11
'c' ->
Just 12
'd' ->
Just 13
'e' ->
Just 14
'f' ->
Just 15
_ ->
Nothing
keywords : Parser Color
keywords =
oneOf
[ fromHexString "#000000" |. keyword "black"
, fromHexString "#c0c0c0" |. keyword "silver"
, fromHexString "#808080" |. keyword "gray"
, fromHexString "#ffffff" |. keyword "white"
, fromHexString "#800000" |. keyword "maroon"
, fromHexString "#ff0000" |. keyword "red"
, fromHexString "#800080" |. keyword "purple"
, fromHexString "#ff00ff" |. keyword "fuchsia"
, fromHexString "#008000" |. keyword "green"
, fromHexString "#00ff00" |. keyword "lime"
, fromHexString "#808000" |. keyword "olive"
, fromHexString "#ffff00" |. keyword "yellow"
, fromHexString "#000080" |. keyword "navy"
, fromHexString "#0000ff" |. keyword "blue"
, fromHexString "#008080" |. keyword "teal"
, fromHexString "#00ffff" |. keyword "aqua"
, fromHexString "#ffa500" |. keyword "orange"
, fromHexString "#f0f8ff" |. keyword "aliceblue"
, fromHexString "#faebd7" |. keyword "antiquewhite"
, fromHexString "#7fffd4" |. keyword "aquamarine"
, fromHexString "#f0ffff" |. keyword "azure"
, fromHexString "#f5f5dc" |. keyword "beige"
, fromHexString "#ffe4c4" |. keyword "bisque"
, fromHexString "#ffebcd" |. keyword "blanchedalmond"
, fromHexString "#8a2be2" |. keyword "blueviolet"
, fromHexString "#a52a2a" |. keyword "brown"
, fromHexString "#deb887" |. keyword "burlywood"
, fromHexString "#5f9ea0" |. keyword "cadetblue"
, fromHexString "#7fff00" |. keyword "chartreuse"
, fromHexString "#d2691e" |. keyword "chocolate"
, fromHexString "#ff7f50" |. keyword "coral"
, fromHexString "#6495ed" |. keyword "cornflowerblue"
, fromHexString "#fff8dc" |. keyword "cornsilk"
, fromHexString "#dc143c" |. keyword "crimson"
, fromHexString "#00ffff" |. keyword "cyan"
, fromHexString "#00008b" |. keyword "darkblue"
, fromHexString "#008b8b" |. keyword "darkcyan"
, fromHexString "#b8860b" |. keyword "darkgoldenrod"
, fromHexString "#a9a9a9" |. keyword "darkgray"
, fromHexString "#006400" |. keyword "darkgreen"
, fromHexString "#a9a9a9" |. keyword "darkgrey"
, fromHexString "#bdb76b" |. keyword "darkkhaki"
, fromHexString "#8b008b" |. keyword "darkmagenta"
, fromHexString "#556b2f" |. keyword "darkolivegreen"
, fromHexString "#ff8c00" |. keyword "darkorange"
, fromHexString "#9932cc" |. keyword "darkorchid"
, fromHexString "#8b0000" |. keyword "darkred"
, fromHexString "#e9967a" |. keyword "darksalmon"
, fromHexString "#8fbc8f" |. keyword "darkseagreen"
, fromHexString "#483d8b" |. keyword "darkslateblue"
, fromHexString "#2f4f4f" |. keyword "darkslategray"
, fromHexString "#2f4f4f" |. keyword "darkslategrey"
, fromHexString "#00ced1" |. keyword "darkturquoise"
, fromHexString "#9400d3" |. keyword "darkviolet"
, fromHexString "#ff1493" |. keyword "deeppink"
, fromHexString "#00bfff" |. keyword "deepskyblue"
, fromHexString "#696969" |. keyword "dimgray"
, fromHexString "#696969" |. keyword "dimgrey"
, fromHexString "#1e90ff" |. keyword "dodgerblue"
, fromHexString "#b22222" |. keyword "firebrick"
, fromHexString "#fffaf0" |. keyword "floralwhite"
, fromHexString "#228b22" |. keyword "forestgreen"
, fromHexString "#dcdcdc" |. keyword "gainsboro"
, fromHexString "#f8f8ff" |. keyword "ghostwhite"
, fromHexString "#ffd700" |. keyword "gold"
, fromHexString "#daa520" |. keyword "goldenrod"
, fromHexString "#adff2f" |. keyword "greenyellow"
, fromHexString "#808080" |. keyword "grey"
, fromHexString "#f0fff0" |. keyword "honeydew"
, fromHexString "#ff69b4" |. keyword "hotpink"
, fromHexString "#cd5c5c" |. keyword "indianred"
, fromHexString "#4b0082" |. keyword "indigo"
, fromHexString "#fffff0" |. keyword "ivory"
, fromHexString "#f0e68c" |. keyword "khaki"
, fromHexString "#e6e6fa" |. keyword "lavender"
, fromHexString "#fff0f5" |. keyword "lavenderblush"
, fromHexString "#7cfc00" |. keyword "lawngreen"
, fromHexString "#fffacd" |. keyword "lemonchiffon"
, fromHexString "#add8e6" |. keyword "lightblue"
, fromHexString "#f08080" |. keyword "lightcoral"
, fromHexString "#e0ffff" |. keyword "lightcyan"
, fromHexString "#fafad2" |. keyword "lightgoldenrodyellow"
, fromHexString "#d3d3d3" |. keyword "lightgray"
, fromHexString "#90ee90" |. keyword "lightgreen"
, fromHexString "#d3d3d3" |. keyword "lightgrey"
, fromHexString "#ffb6c1" |. keyword "lightpink"
, fromHexString "#ffa07a" |. keyword "lightsalmon"
, fromHexString "#20b2aa" |. keyword "lightseagreen"
, fromHexString "#87cefa" |. keyword "lightskyblue"
, fromHexString "#778899" |. keyword "lightslategray"
, fromHexString "#778899" |. keyword "lightslategrey"
, fromHexString "#b0c4de" |. keyword "lightsteelblue"
, fromHexString "#ffffe0" |. keyword "lightyellow"
, fromHexString "#32cd32" |. keyword "limegreen"
, fromHexString "#faf0e6" |. keyword "linen"
, fromHexString "#ff00ff" |. keyword "magenta"
, fromHexString "#66cdaa" |. keyword "mediumaquamarine"
, fromHexString "#0000cd" |. keyword "mediumblue"
, fromHexString "#ba55d3" |. keyword "mediumorchid"
, fromHexString "#9370db" |. keyword "mediumpurple"
, fromHexString "#3cb371" |. keyword "mediumseagreen"
, fromHexString "#7b68ee" |. keyword "mediumslateblue"
, fromHexString "#00fa9a" |. keyword "mediumspringgreen"
, fromHexString "#48d1cc" |. keyword "mediumturquoise"
, fromHexString "#c71585" |. keyword "mediumvioletred"
, fromHexString "#191970" |. keyword "midnightblue"
, fromHexString "#f5fffa" |. keyword "mintcream"
, fromHexString "#ffe4e1" |. keyword "mistyrose"
, fromHexString "#ffe4b5" |. keyword "moccasin"
, fromHexString "#ffdead" |. keyword "navajowhite"
, fromHexString "#fdf5e6" |. keyword "oldlace"
, fromHexString "#6b8e23" |. keyword "olivedrab"
, fromHexString "#ff4500" |. keyword "orangered"
, fromHexString "#da70d6" |. keyword "orchid"
, fromHexString "#eee8aa" |. keyword "palegoldenrod"
, fromHexString "#98fb98" |. keyword "palegreen"
, fromHexString "#afeeee" |. keyword "paleturquoise"
, fromHexString "#db7093" |. keyword "palevioletred"
, fromHexString "#ffefd5" |. keyword "papayawhip"
, fromHexString "#ffdab9" |. keyword "peachpuff"
, fromHexString "#cd853f" |. keyword "peru"
, fromHexString "#ffc0cb" |. keyword "pink"
, fromHexString "#dda0dd" |. keyword "plum"
, fromHexString "#b0e0e6" |. keyword "powderblue"
, fromHexString "#bc8f8f" |. keyword "rosybrown"
, fromHexString "#4169e1" |. keyword "royalblue"
, fromHexString "#8b4513" |. keyword "saddlebrown"
, fromHexString "#fa8072" |. keyword "salmon"
, fromHexString "#f4a460" |. keyword "sandybrown"
, fromHexString "#2e8b57" |. keyword "seagreen"
, fromHexString "#fff5ee" |. keyword "seashell"
, fromHexString "#a0522d" |. keyword "sienna"
, fromHexString "#87ceeb" |. keyword "skyblue"
, fromHexString "#6a5acd" |. keyword "slateblue"
, fromHexString "#708090" |. keyword "slategray"
, fromHexString "#708090" |. keyword "slategrey"
, fromHexString "#fffafa" |. keyword "snow"
, fromHexString "#00ff7f" |. keyword "springgreen"
, fromHexString "#4682b4" |. keyword "steelblue"
, fromHexString "#d2b48c" |. keyword "tan"
, fromHexString "#d8bfd8" |. keyword "thistle"
, fromHexString "#ff6347" |. keyword "tomato"
, fromHexString "#40e0d0" |. keyword "turquoise"
, fromHexString "#ee82ee" |. keyword "violet"
, fromHexString "#f5deb3" |. keyword "wheat"
, fromHexString "#f5f5f5" |. keyword "whitesmoke"
, fromHexString "#9acd32" |. keyword "yellowgreen"
, fromHexString "#663399" |. keyword "rebeccapurple"
, succeed (Color 0 0 0 0) |. keyword "transparent"
]
parse : String -> Result String Color
parse string =
Parser.run parser string |> Result.mapError Parser.deadEndsToString
|
