-- This list of colour names was extracted and converted from
-- https://drafts.csswg.org/css-color/#named-colors


local colournames = {}

colournames["aliceblue"] =  "#F0F8FF"
colournames["antiquewhite"] =  "#FAEBD7"
colournames["aqua"] =  "#00FFFF"
colournames["aquamarine"] =  "#7FFFD4"
colournames["azure"] =  "#F0FFFF"
colournames["beige"] =  "#F5F5DC"
colournames["bisque"] =  "#FFE4C4"
colournames["black"] =  "#000000"
colournames["blanchedalmond"] =  "#FFEBCD"
colournames["blue"] =  "#0000FF"
colournames["blueviolet"] =  "#8A2BE2"
colournames["brown"] =  "#A52A2A"
colournames["burlywood"] =  "#DEB887"
colournames["cadetblue"] =  "#5F9EA0"
colournames["chartreuse"] =  "#7FFF00"
colournames["chocolate"] =  "#D2691E"
colournames["coral"] =  "#FF7F50"
colournames["cornflowerblue"] =  "#6495ED"
colournames["cornsilk"] =  "#FFF8DC"
colournames["crimson"] =  "#DC143C"
colournames["cyan"] =  "#00FFFF"
colournames["darkblue"] =  "#00008B"
colournames["darkcyan"] =  "#008B8B"
colournames["darkgoldenrod"] =  "#B8860B"
colournames["darkgray"] =  "#A9A9A9"
colournames["darkgreen"] =  "#006400"
colournames["darkgrey"] =  "#A9A9A9"
colournames["darkkhaki"] =  "#BDB76B"
colournames["darkmagenta"] =  "#8B008B"
colournames["darkolivegreen"] =  "#556B2F"
colournames["darkorange"] =  "#FF8C00"
colournames["darkorchid"] =  "#9932CC"
colournames["darkred"] =  "#8B0000"
colournames["darksalmon"] =  "#E9967A"
colournames["darkseagreen"] =  "#8FBC8F"
colournames["darkslateblue"] =  "#483D8B"
colournames["darkslategray"] =  "#2F4F4F"
colournames["darkslategrey"] =  "#2F4F4F"
colournames["darkturquoise"] =  "#00CED1"
colournames["darkviolet"] =  "#9400D3"
colournames["deeppink"] =  "#FF1493"
colournames["deepskyblue"] =  "#00BFFF"
colournames["dimgray"] =  "#696969"
colournames["dimgrey"] =  "#696969"
colournames["dodgerblue"] =  "#1E90FF"
colournames["firebrick"] =  "#B22222"
colournames["floralwhite"] =  "#FFFAF0"
colournames["forestgreen"] =  "#228B22"
colournames["fuchsia"] =  "#FF00FF"
colournames["gainsboro"] =  "#DCDCDC"
colournames["ghostwhite"] =  "#F8F8FF"
colournames["gold"] =  "#FFD700"
colournames["goldenrod"] =  "#DAA520"
colournames["gray"] =  "#808080"
colournames["green"] =  "#008000"
colournames["greenyellow"] =  "#ADFF2F"
colournames["grey"] =  "#808080"
colournames["honeydew"] =  "#F0FFF0"
colournames["hotpink"] =  "#FF69B4"
colournames["indianred"] =  "#CD5C5C"
colournames["indigo"] =  "#4B0082"
colournames["ivory"] =  "#FFFFF0"
colournames["khaki"] =  "#F0E68C"
colournames["lavender"] =  "#E6E6FA"
colournames["lavenderblush"] =  "#FFF0F5"
colournames["lawngreen"] =  "#7CFC00"
colournames["lemonchiffon"] =  "#FFFACD"
colournames["lightblue"] =  "#ADD8E6"
colournames["lightcoral"] =  "#F08080"
colournames["lightcyan"] =  "#E0FFFF"
colournames["lightgoldenrodyellow"] =  "#FAFAD2"
colournames["lightgray"] =  "#D3D3D3"
colournames["lightgreen"] =  "#90EE90"
colournames["lightgrey"] =  "#D3D3D3"
colournames["lightpink"] =  "#FFB6C1"
colournames["lightsalmon"] =  "#FFA07A"
colournames["lightseagreen"] =  "#20B2AA"
colournames["lightskyblue"] =  "#87CEFA"
colournames["lightslategray"] =  "#778899"
colournames["lightslategrey"] =  "#778899"
colournames["lightsteelblue"] =  "#B0C4DE"
colournames["lightyellow"] =  "#FFFFE0"
colournames["lime"] =  "#00FF00"
colournames["limegreen"] =  "#32CD32"
colournames["linen"] =  "#FAF0E6"
colournames["magenta"] =  "#FF00FF"
colournames["maroon"] =  "#800000"
colournames["mediumaquamarine"] =  "#66CDAA"
colournames["mediumblue"] =  "#0000CD"
colournames["mediumorchid"] =  "#BA55D3"
colournames["mediumpurple"] =  "#9370DB"
colournames["mediumseagreen"] =  "#3CB371"
colournames["mediumslateblue"] =  "#7B68EE"
colournames["mediumspringgreen"] =  "#00FA9A"
colournames["mediumturquoise"] =  "#48D1CC"
colournames["mediumvioletred"] =  "#C71585"
colournames["midnightblue"] =  "#191970"
colournames["mintcream"] =  "#F5FFFA"
colournames["mistyrose"] =  "#FFE4E1"
colournames["moccasin"] =  "#FFE4B5"
colournames["navajowhite"] =  "#FFDEAD"
colournames["navy"] =  "#000080"
colournames["oldlace"] =  "#FDF5E6"
colournames["olive"] =  "#808000"
colournames["olivedrab"] =  "#6B8E23"
colournames["orange"] =  "#FFA500"
colournames["orangered"] =  "#FF4500"
colournames["orchid"] =  "#DA70D6"
colournames["palegoldenrod"] =  "#EEE8AA"
colournames["palegreen"] =  "#98FB98"
colournames["paleturquoise"] =  "#AFEEEE"
colournames["palevioletred"] =  "#DB7093"
colournames["papayawhip"] =  "#FFEFD5"
colournames["peachpuff"] =  "#FFDAB9"
colournames["peru"] =  "#CD853F"
colournames["pink"] =  "#FFC0CB"
colournames["plum"] =  "#DDA0DD"
colournames["powderblue"] =  "#B0E0E6"
colournames["purple"] =  "#800080"
colournames["rebeccapurple"] =  "#663399"
colournames["red"] =  "#FF0000"
colournames["rosybrown"] =  "#BC8F8F"
colournames["royalblue"] =  "#4169E1"
colournames["saddlebrown"] =  "#8B4513"
colournames["salmon"] =  "#FA8072"
colournames["sandybrown"] =  "#F4A460"
colournames["seagreen"] =  "#2E8B57"
colournames["seashell"] =  "#FFF5EE"
colournames["sienna"] =  "#A0522D"
colournames["silver"] =  "#C0C0C0"
colournames["skyblue"] =  "#87CEEB"
colournames["slateblue"] =  "#6A5ACD"
colournames["slategray"] =  "#708090"
colournames["slategrey"] =  "#708090"
colournames["snow"] =  "#FFFAFA"
colournames["springgreen"] =  "#00FF7F"
colournames["steelblue"] =  "#4682B4"
colournames["tan"] =  "#D2B48C"
colournames["teal"] =  "#008080"
colournames["thistle"] =  "#D8BFD8"
colournames["tomato"] =  "#FF6347"
colournames["turquoise"] =  "#40E0D0"
colournames["violet"] =  "#EE82EE"
colournames["wheat"] =  "#F5DEB3"
colournames["white"] =  "#FFFFFF"
colournames["whitesmoke"] =  "#F5F5F5"
colournames["yellow"] =  "#FFFF00"
colournames["yellowgreen"] =  "#9ACD32"


function colourname2hex(colname)
   if not colname then return "" end
   if colname == "" then return "" end
   if colname:sub(1,1) == "#" then
      if #colname == 7 then
	 -- let's guess it's a hexcode as colour
	 return colname
      end 
   end
   if colournames[colname] then
      return colournames[colname]
   end
   -- be safe and return nothing
   return ""
end