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index.js
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index.js
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'use strict';
//every string I match against are lowercase
var HEX_PATTERN = /^#(?:[a-f0-9]{3})?(?:[a-f0-9]{3})$/;
// css color names + initial + inherit + currentColor + transparent
var CSS_COLOR_NAMES = [
'aliceblue',
'antiquewhite',
'aqua',
'aquamarine',
'azure',
'beige',
'bisque',
'black',
'blanchedalmond',
'blue',
'blueviolet',
'brown',
'burlywood',
'cadetblue',
'chartreuse',
'chocolate',
'coral',
'cornflowerblue',
'cornsilk',
'crimson',
'currentColor',
'cyan',
'darkblue',
'darkcyan',
'darkgoldenrod',
'darkgray',
'darkgreen',
'darkgrey',
'darkkhaki',
'darkmagenta',
'darkolivegreen',
'darkorange',
'darkorchid',
'darkred',
'darksalmon',
'darkseagreen',
'darkslateblue',
'darkslategray',
'darkslategrey',
'darkturquoise',
'darkviolet',
'deeppink',
'deepskyblue',
'dimgray',
'dimgrey',
'dodgerblue',
'firebrick',
'floralwhite',
'forestgreen',
'fuchsia',
'gainsboro',
'ghostwhite',
'gold',
'goldenrod',
'gray',
'green',
'greenyellow',
'grey',
'honeydew',
'hotpink',
'indianred',
'indigo',
'inherit',
'initial',
'ivory',
'khaki',
'lavender',
'lavenderblush',
'lawngreen',
'lemonchiffon',
'lightblue',
'lightcoral',
'lightcyan',
'lightgoldenrodyellow',
'lightgray',
'lightgreen',
'lightgrey',
'lightpink',
'lightsalmon',
'lightseagreen',
'lightskyblue',
'lightslategray',
'lightslategrey',
'lightsteelblue',
'lightyellow',
'lime',
'limegreen',
'linen',
'magenta',
'maroon',
'mediumaquamarine',
'mediumblue',
'mediumorchid',
'mediumpurple',
'mediumseagreen',
'mediumslateblue',
'mediumspringgreen',
'mediumturquoise',
'mediumvioletred',
'midnightblue',
'mintcream',
'mistyrose',
'moccasin',
'navajowhite',
'navy',
'oldlace',
'olive',
'olivedrab',
'orange',
'orangered',
'orchid',
'palegoldenrod',
'palegreen',
'paleturquoise',
'palevioletred',
'papayawhip',
'peachpuff',
'peru',
'pink',
'plum',
'powderblue',
'purple',
'rebeccapurple',
'red',
'rosybrown',
'royalblue',
'saddlebrown',
'salmon',
'sandybrown',
'seagreen',
'seashell',
'sienna',
'silver',
'skyblue',
'slateblue',
'slategray',
'slategrey',
'snow',
'springgreen',
'steelblue',
'tan',
'teal',
'thistle',
'tomato',
'transparent',
'turquoise',
'violet',
'wheat',
'white',
'whitesmoke',
'yellow',
'yellowgreen',
];
var PREFIX = '^(rgb|hsl)(a?)\\s*\\(';
var VALUE = '\\s*([-+]?\\d+%?)\\s*';
var ALPHA = '(?:,\\s*([-+]?(?:(?:\\d+(?:\.\\d+)?)|(?:\.\\d+))\\s*))?';
var SUFFIX = '\\)$';
var RGB_HSL_PATTERN = new RegExp(PREFIX + VALUE + ',' + VALUE + ',' + VALUE + ALPHA + SUFFIX);
var NUM_TYPE = 1;
var PERCENTAGE_TYPE = 2;
var ERROR_TYPE = NUM_TYPE & PERCENTAGE_TYPE;
module.exports = function(str) {
function getColorType(token) {
return token.indexOf('%') !== -1 ? PERCENTAGE_TYPE : NUM_TYPE;
}
if(!str || typeof str !== 'string') {
return false;
}
var color = str.replace(/^\s+|\s+$/g, '').toLocaleLowerCase();
// named colors or hex code
if((CSS_COLOR_NAMES.indexOf(color) !== -1) || HEX_PATTERN.test(color)) {
return true;
}
var result = color.match(RGB_HSL_PATTERN);
if(result) {
var flavor = result[1];
var alpha = result[2];
var rh = result[3];
var gs = result[4];
var bl = result[5];
var a = result[6];
// alpha test
if((alpha === 'a' && !a) || (a && alpha === '')) {
return false;
}
// hsl
if(flavor === 'hsl') {
if(getColorType(rh) !== NUM_TYPE) {
return false;
}
return (getColorType(gs) & getColorType(bl)) === PERCENTAGE_TYPE;
}
// rgb
return (getColorType(rh) & getColorType(gs) & getColorType(bl)) !== ERROR_TYPE;
}
return false;
};