resolve CSS3 named colors

hexcolor.go

@@ -18,6 +18,7 @@ func NewHexColor(hc string) (*HexColor, error) {
 	c := &HexColor{original: hc}
 	hc = strings.TrimLeft(strings.ToLower(hc), "#")
 
+	// normalize hex color
 	if _, err := strconv.ParseUint(hc, 16, 24); err == nil {
 		if len(hc) == 6 {
 			c.hex = hc
@@ -29,7 +30,12 @@ func NewHexColor(hc string) (*HexColor, error) {
 		}
 	}
 
-	// handle named colors
+	// resolve named color to hex color
+	val, exist := CSS3ColorMap[strings.TrimSpace(hc)]
+	if exist {
+		c.hex = string(val)
+		return c, nil
+	}
 
 	return nil, fmt.Errorf("Malformed color: %s", hc)
 }

hexcolor_test.go

@@ -15,7 +15,14 @@ func TestNewHexColor(t *testing.T) {
 		{"#dd22cc", "dd22cc", false},
 		{"#adf", "aaddff", false},
 		{"15d", "1155dd", false},
-		{"a5i", "", true},
+		{"15di", "1155dd", true},
+		{"2e8b57", "2e8b57", false},
+		{"2e8b572e8b57", "", true},
+
+		{"Red", "ff0000", false},
+		{"blue", "0000ff", false},
+		{"reed", "", true},
+		{"", "", true},
 	}
 
 	for _, tc := range cases {

named.go

@@ -1 +1,311 @@
-package go_hexcolor
+package hexcolor
+
+type ANSIColor string
+
+// CSS3 named colors
+// ref: https://drafts.csswg.org/css-color-3/
+type CSS3Color string
+
+const (
+	Aliceblue            CSS3Color = "f0f8ff"
+	Antiquewhite         CSS3Color = "faebd7"
+	Aqua                 CSS3Color = "00ffff"
+	Aquamarine           CSS3Color = "7fffd4"
+	Azure                CSS3Color = "f0ffff"
+	Beige                CSS3Color = "f5f5dc"
+	Bisque               CSS3Color = "ffe4c4"
+	Black                CSS3Color = "000000"
+	Blanchedalmond       CSS3Color = "ffebcd"
+	Blue                 CSS3Color = "0000ff"
+	Blueviolet           CSS3Color = "8a2be2"
+	Brown                CSS3Color = "a52a2a"
+	Burlywood            CSS3Color = "deb887"
+	Cadetblue            CSS3Color = "5f9ea0"
+	Chartreuse           CSS3Color = "7fff00"
+	Chocolate            CSS3Color = "d2691e"
+	Coral                CSS3Color = "ff7f50"
+	Cornflowerblue       CSS3Color = "6495ed"
+	Cornsilk             CSS3Color = "fff8dc"
+	Crimson              CSS3Color = "dc143c"
+	Cyan                 CSS3Color = "00ffff"
+	Darkblue             CSS3Color = "00008b"
+	Darkcyan             CSS3Color = "008b8b"
+	Darkgoldenrod        CSS3Color = "b8860b"
+	Darkgray             CSS3Color = "a9a9a9"
+	Darkgreen            CSS3Color = "006400"
+	Darkgrey             CSS3Color = "a9a9a9"
+	Darkkhaki            CSS3Color = "bdb76b"
+	Darkmagenta          CSS3Color = "8b008b"
+	Darkolivegreen       CSS3Color = "556b2f"
+	Darkorange           CSS3Color = "ff8c00"
+	Darkorchid           CSS3Color = "9932cc"
+	Darkred              CSS3Color = "8b0000"
+	Darksalmon           CSS3Color = "e9967a"
+	Darkseagreen         CSS3Color = "8fbc8f"
+	Darkslateblue        CSS3Color = "483d8b"
+	Darkslategray        CSS3Color = "2f4f4f"
+	Darkslategrey        CSS3Color = "2f4f4f"
+	Darkturquoise        CSS3Color = "00ced1"
+	Darkviolet           CSS3Color = "9400d3"
+	Deeppink             CSS3Color = "ff1493"
+	Deepskyblue          CSS3Color = "00bfff"
+	Dimgray              CSS3Color = "696969"
+	Dimgrey              CSS3Color = "696969"
+	Dodgerblue           CSS3Color = "1e90ff"
+	Firebrick            CSS3Color = "b22222"
+	Floralwhite          CSS3Color = "fffaf0"
+	Forestgreen          CSS3Color = "228b22"
+	Fuchsia              CSS3Color = "ff00ff"
+	Gainsboro            CSS3Color = "dcdcdc"
+	Ghostwhite           CSS3Color = "f8f8ff"
+	Gold                 CSS3Color = "ffd700"
+	Goldenrod            CSS3Color = "daa520"
+	Gray                 CSS3Color = "808080"
+	Green                CSS3Color = "008000"
+	Greenyellow          CSS3Color = "adff2f"
+	Grey                 CSS3Color = "808080"
+	Honeydew             CSS3Color = "f0fff0"
+	Hotpink              CSS3Color = "ff69b4"
+	Indianred            CSS3Color = "cd5c5c"
+	Indigo               CSS3Color = "4b0082"
+	Ivory                CSS3Color = "fffff0"
+	Khaki                CSS3Color = "f0e68c"
+	Lavender             CSS3Color = "e6e6fa"
+	Lavenderblush        CSS3Color = "fff0f5"
+	Lawngreen            CSS3Color = "7cfc00"
+	Lemonchiffon         CSS3Color = "fffacd"
+	Lightblue            CSS3Color = "add8e6"
+	Lightcoral           CSS3Color = "f08080"
+	Lightcyan            CSS3Color = "e0ffff"
+	Lightgoldenrodyellow CSS3Color = "fafad2"
+	Lightgray            CSS3Color = "d3d3d3"
+	Lightgreen           CSS3Color = "90ee90"
+	Lightgrey            CSS3Color = "d3d3d3"
+	Lightpink            CSS3Color = "ffb6c1"
+	Lightsalmon          CSS3Color = "ffa07a"
+	Lightseagreen        CSS3Color = "20b2aa"
+	Lightskyblue         CSS3Color = "87cefa"
+	Lightslategray       CSS3Color = "778899"
+	Lightslategrey       CSS3Color = "778899"
+	Lightsteelblue       CSS3Color = "b0c4de"
+	Lightyellow          CSS3Color = "ffffe0"
+	Lime                 CSS3Color = "00ff00"
+	Limegreen            CSS3Color = "32cd32"
+	Linen                CSS3Color = "faf0e6"
+	Magenta              CSS3Color = "ff00ff"
+	Maroon               CSS3Color = "800000"
+	Mediumaquamarine     CSS3Color = "66cdaa"
+	Mediumblue           CSS3Color = "0000cd"
+	Mediumorchid         CSS3Color = "ba55d3"
+	Mediumpurple         CSS3Color = "9370db"
+	Mediumseagreen       CSS3Color = "3cb371"
+	Mediumslateblue      CSS3Color = "7b68ee"
+	Mediumspringgreen    CSS3Color = "00fa9a"
+	Mediumturquoise      CSS3Color = "48d1cc"
+	Mediumvioletred      CSS3Color = "c71585"
+	Midnightblue         CSS3Color = "191970"
+	Mintcream            CSS3Color = "f5fffa"
+	Mistyrose            CSS3Color = "ffe4e1"
+	Moccasin             CSS3Color = "ffe4b5"
+	Navajowhite          CSS3Color = "ffdead"
+	Navy                 CSS3Color = "000080"
+	Oldlace              CSS3Color = "fdf5e6"
+	Olive                CSS3Color = "808000"
+	Olivedrab            CSS3Color = "6b8e23"
+	Orange               CSS3Color = "ffa500"
+	Orangered            CSS3Color = "ff4500"
+	Orchid               CSS3Color = "da70d6"
+	Palegoldenrod        CSS3Color = "eee8aa"
+	Palegreen            CSS3Color = "98fb98"
+	Paleturquoise        CSS3Color = "afeeee"
+	Palevioletred        CSS3Color = "db7093"
+	Papayawhip           CSS3Color = "ffefd5"
+	Peachpuff            CSS3Color = "ffdab9"
+	Peru                 CSS3Color = "cd853f"
+	Pink                 CSS3Color = "ffc0cb"
+	Plum                 CSS3Color = "dda0dd"
+	Powderblue           CSS3Color = "b0e0e6"
+	Purple               CSS3Color = "800080"
+	Red                  CSS3Color = "ff0000"
+	Rosybrown            CSS3Color = "bc8f8f"
+	Royalblue            CSS3Color = "4169e1"
+	Saddlebrown          CSS3Color = "8b4513"
+	Salmon               CSS3Color = "fa8072"
+	Sandybrown           CSS3Color = "f4a460"
+	Seagreen             CSS3Color = "2e8b57"
+	Seashell             CSS3Color = "fff5ee"
+	Sienna               CSS3Color = "a0522d"
+	Silver               CSS3Color = "c0c0c0"
+	Skyblue              CSS3Color = "87ceeb"
+	Slateblue            CSS3Color = "6a5acd"
+	Slategray            CSS3Color = "708090"
+	Slategrey            CSS3Color = "708090"
+	Snow                 CSS3Color = "fffafa"
+	Springgreen          CSS3Color = "00ff7f"
+	Steelblue            CSS3Color = "4682b4"
+	Tan                  CSS3Color = "d2b48c"
+	Teal                 CSS3Color = "008080"
+	Thistle              CSS3Color = "d8bfd8"
+	Tomato               CSS3Color = "ff6347"
+	Turquoise            CSS3Color = "40e0d0"
+	Violet               CSS3Color = "ee82ee"
+	Wheat                CSS3Color = "f5deb3"
+	White                CSS3Color = "ffffff"
+	Whitesmoke           CSS3Color = "f5f5f5"
+	Yellow               CSS3Color = "ffff00"
+	Yellowgreen          CSS3Color = "9acd32"
+)
+
+var CSS3ColorMap map[string]CSS3Color
+
+func init() {
+	CSS3ColorMap = make(map[string]CSS3Color)
+
+	CSS3ColorMap["aliceblue"] = Aliceblue
+	CSS3ColorMap["antiquewhite"] = Antiquewhite
+	CSS3ColorMap["aqua"] = Aqua
+	CSS3ColorMap["aquamarine"] = Aquamarine
+	CSS3ColorMap["azure"] = Azure
+	CSS3ColorMap["beige"] = Beige
+	CSS3ColorMap["bisque"] = Bisque
+	CSS3ColorMap["black"] = Black
+	CSS3ColorMap["blanchedalmond"] = Blanchedalmond
+	CSS3ColorMap["blue"] = Blue
+	CSS3ColorMap["blueviolet"] = Blueviolet
+	CSS3ColorMap["brown"] = Brown
+	CSS3ColorMap["burlywood"] = Burlywood
+	CSS3ColorMap["cadetblue"] = Cadetblue
+	CSS3ColorMap["chartreuse"] = Chartreuse
+	CSS3ColorMap["chocolate"] = Chocolate
+	CSS3ColorMap["coral"] = Coral
+	CSS3ColorMap["cornflowerblue"] = Cornflowerblue
+	CSS3ColorMap["cornsilk"] = Cornsilk
+	CSS3ColorMap["crimson"] = Crimson
+	CSS3ColorMap["cyan"] = Cyan
+	CSS3ColorMap["darkblue"] = Darkblue
+	CSS3ColorMap["darkcyan"] = Darkcyan
+	CSS3ColorMap["darkgoldenrod"] = Darkgoldenrod
+	CSS3ColorMap["darkgray"] = Darkgray
+	CSS3ColorMap["darkgreen"] = Darkgreen
+	CSS3ColorMap["darkgrey"] = Darkgrey
+	CSS3ColorMap["darkkhaki"] = Darkkhaki
+	CSS3ColorMap["darkmagenta"] = Darkmagenta
+	CSS3ColorMap["darkolivegreen"] = Darkolivegreen
+	CSS3ColorMap["darkorange"] = Darkorange
+	CSS3ColorMap["darkorchid"] = Darkorchid
+	CSS3ColorMap["darkred"] = Darkred
+	CSS3ColorMap["darksalmon"] = Darksalmon
+	CSS3ColorMap["darkseagreen"] = Darkseagreen
+	CSS3ColorMap["darkslateblue"] = Darkslateblue
+	CSS3ColorMap["darkslategray"] = Darkslategray
+	CSS3ColorMap["darkslategrey"] = Darkslategrey
+	CSS3ColorMap["darkturquoise"] = Darkturquoise
+	CSS3ColorMap["darkviolet"] = Darkviolet
+	CSS3ColorMap["deeppink"] = Deeppink
+	CSS3ColorMap["deepskyblue"] = Deepskyblue
+	CSS3ColorMap["dimgray"] = Dimgray
+	CSS3ColorMap["dimgrey"] = Dimgrey
+	CSS3ColorMap["dodgerblue"] = Dodgerblue
+	CSS3ColorMap["firebrick"] = Firebrick
+	CSS3ColorMap["floralwhite"] = Floralwhite
+	CSS3ColorMap["forestgreen"] = Forestgreen
+	CSS3ColorMap["fuchsia"] = Fuchsia
+	CSS3ColorMap["gainsboro"] = Gainsboro
+	CSS3ColorMap["ghostwhite"] = Ghostwhite
+	CSS3ColorMap["gold"] = Gold
+	CSS3ColorMap["goldenrod"] = Goldenrod
+	CSS3ColorMap["gray"] = Gray
+	CSS3ColorMap["green"] = Green
+	CSS3ColorMap["greenyellow"] = Greenyellow
+	CSS3ColorMap["grey"] = Grey
+	CSS3ColorMap["honeydew"] = Honeydew
+	CSS3ColorMap["hotpink"] = Hotpink
+	CSS3ColorMap["indianred"] = Indianred
+	CSS3ColorMap["indigo"] = Indigo
+	CSS3ColorMap["ivory"] = Ivory
+	CSS3ColorMap["khaki"] = Khaki
+	CSS3ColorMap["lavender"] = Lavender
+	CSS3ColorMap["lavenderblush"] = Lavenderblush
+	CSS3ColorMap["lawngreen"] = Lawngreen
+	CSS3ColorMap["lemonchiffon"] = Lemonchiffon
+	CSS3ColorMap["lightblue"] = Lightblue
+	CSS3ColorMap["lightcoral"] = Lightcoral
+	CSS3ColorMap["lightcyan"] = Lightcyan
+	CSS3ColorMap["lightgoldenrodyellow"] = Lightgoldenrodyellow
+	CSS3ColorMap["lightgray"] = Lightgray
+	CSS3ColorMap["lightgreen"] = Lightgreen
+	CSS3ColorMap["lightgrey"] = Lightgrey
+	CSS3ColorMap["lightpink"] = Lightpink
+	CSS3ColorMap["lightsalmon"] = Lightsalmon
+	CSS3ColorMap["lightseagreen"] = Lightseagreen
+	CSS3ColorMap["lightskyblue"] = Lightskyblue
+	CSS3ColorMap["lightslategray"] = Lightslategray
+	CSS3ColorMap["lightslategrey"] = Lightslategrey
+	CSS3ColorMap["lightsteelblue"] = Lightsteelblue
+	CSS3ColorMap["lightyellow"] = Lightyellow
+	CSS3ColorMap["lime"] = Lime
+	CSS3ColorMap["limegreen"] = Limegreen
+	CSS3ColorMap["linen"] = Linen
+	CSS3ColorMap["magenta"] = Magenta
+	CSS3ColorMap["maroon"] = Maroon
+	CSS3ColorMap["mediumaquamarine"] = Mediumaquamarine
+	CSS3ColorMap["mediumblue"] = Mediumblue
+	CSS3ColorMap["mediumorchid"] = Mediumorchid
+	CSS3ColorMap["mediumpurple"] = Mediumpurple
+	CSS3ColorMap["mediumseagreen"] = Mediumseagreen
+	CSS3ColorMap["mediumslateblue"] = Mediumslateblue
+	CSS3ColorMap["mediumspringgreen"] = Mediumspringgreen
+	CSS3ColorMap["mediumturquoise"] = Mediumturquoise
+	CSS3ColorMap["mediumvioletred"] = Mediumvioletred
+	CSS3ColorMap["midnightblue"] = Midnightblue
+	CSS3ColorMap["mintcream"] = Mintcream
+	CSS3ColorMap["mistyrose"] = Mistyrose
+	CSS3ColorMap["moccasin"] = Moccasin
+	CSS3ColorMap["navajowhite"] = Navajowhite
+	CSS3ColorMap["navy"] = Navy
+	CSS3ColorMap["oldlace"] = Oldlace
+	CSS3ColorMap["olive"] = Olive
+	CSS3ColorMap["olivedrab"] = Olivedrab
+	CSS3ColorMap["orange"] = Orange
+	CSS3ColorMap["orangered"] = Orangered
+	CSS3ColorMap["orchid"] = Orchid
+	CSS3ColorMap["palegoldenrod"] = Palegoldenrod
+	CSS3ColorMap["palegreen"] = Palegreen
+	CSS3ColorMap["paleturquoise"] = Paleturquoise
+	CSS3ColorMap["palevioletred"] = Palevioletred
+	CSS3ColorMap["papayawhip"] = Papayawhip
+	CSS3ColorMap["peachpuff"] = Peachpuff
+	CSS3ColorMap["peru"] = Peru
+	CSS3ColorMap["pink"] = Pink
+	CSS3ColorMap["plum"] = Plum
+	CSS3ColorMap["powderblue"] = Powderblue
+	CSS3ColorMap["purple"] = Purple
+	CSS3ColorMap["red"] = Red
+	CSS3ColorMap["rosybrown"] = Rosybrown
+	CSS3ColorMap["royalblue"] = Royalblue
+	CSS3ColorMap["saddlebrown"] = Saddlebrown
+	CSS3ColorMap["salmon"] = Salmon
+	CSS3ColorMap["sandybrown"] = Sandybrown
+	CSS3ColorMap["seagreen"] = Seagreen
+	CSS3ColorMap["seashell"] = Seashell
+	CSS3ColorMap["sienna"] = Sienna
+	CSS3ColorMap["silver"] = Silver
+	CSS3ColorMap["skyblue"] = Skyblue
+	CSS3ColorMap["slateblue"] = Slateblue
+	CSS3ColorMap["slategray"] = Slategray
+	CSS3ColorMap["slategrey"] = Slategrey
+	CSS3ColorMap["snow"] = Snow
+	CSS3ColorMap["springgreen"] = Springgreen
+	CSS3ColorMap["steelblue"] = Steelblue
+	CSS3ColorMap["tan"] = Tan
+	CSS3ColorMap["teal"] = Teal
+	CSS3ColorMap["thistle"] = Thistle
+	CSS3ColorMap["tomato"] = Tomato
+	CSS3ColorMap["turquoise"] = Turquoise
+	CSS3ColorMap["violet"] = Violet
+	CSS3ColorMap["wheat"] = Wheat
+	CSS3ColorMap["white"] = White
+	CSS3ColorMap["whitesmoke"] = Whitesmoke
+	CSS3ColorMap["yellow"] = Yellow
+	CSS3ColorMap["yellowgreen"] = Yellowgreen
+}