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'use strict';
var colorString = require('color-string');
var convert = require('color-convert');
var _slice = [].slice;
var skippedModels = [
// to be honest, I don't really feel like keyword belongs in color convert, but eh.
'keyword',
// gray conflicts with some method names, and has its own method defined.
'gray',
// shouldn't really be in color-convert either...
'hex'
];
var hashedModelKeys = {};
Object.keys(convert).forEach(function (model) {
hashedModelKeys[_slice.call(convert[model].labels).sort().join('')] = model;
});
var limiters = {};
function Color(obj, model) {
if (!(this instanceof Color)) {
return new Color(obj, model);
}
if (model && model in skippedModels) {
model = null;
}
if (model && !(model in convert)) {
throw new Error('Unknown model: ' + model);
}
var i;
var channels;
if (obj == null) { // eslint-disable-line no-eq-null,eqeqeq
this.model = 'rgb';
this.color = [0, 0, 0];
this.valpha = 1;
} else if (obj instanceof Color) {
this.model = obj.model;
this.color = obj.color.slice();
this.valpha = obj.valpha;
} else if (typeof obj === 'string') {
var result = colorString.get(obj);
if (result === null) {
throw new Error('Unable to parse color from string: ' + obj);
}
this.model = result.model;
channels = convert[this.model].channels;
this.color = result.value.slice(0, channels);
this.valpha = typeof result.value[channels] === 'number' ? result.value[channels] : 1;
} else if (obj.length) {
this.model = model || 'rgb';
channels = convert[this.model].channels;
var newArr = _slice.call(obj, 0, channels);
this.color = zeroArray(newArr, channels);
this.valpha = typeof obj[channels] === 'number' ? obj[channels] : 1;
} else if (typeof obj === 'number') {
// this is always RGB - can be converted later on.
obj &= 0xFFFFFF;
this.model = 'rgb';
this.color = [
(obj >> 16) & 0xFF,
(obj >> 8) & 0xFF,
obj & 0xFF
];
this.valpha = 1;
} else {
this.valpha = 1;
var keys = Object.keys(obj);
if ('alpha' in obj) {
keys.splice(keys.indexOf('alpha'), 1);
this.valpha = typeof obj.alpha === 'number' ? obj.alpha : 0;
}
var hashedKeys = keys.sort().join('');
if (!(hashedKeys in hashedModelKeys)) {
throw new Error('Unable to parse color from object: ' + JSON.stringify(obj));
}
this.model = hashedModelKeys[hashedKeys];
var labels = convert[this.model].labels;
var color = [];
for (i = 0; i < labels.length; i++) {
color.push(obj[labels[i]]);
}
this.color = zeroArray(color);
}
// perform limitations (clamping, etc.)
if (limiters[this.model]) {
channels = convert[this.model].channels;
for (i = 0; i < channels; i++) {
var limit = limiters[this.model][i];
if (limit) {
this.color[i] = limit(this.color[i]);
}
}
}
this.valpha = Math.max(0, Math.min(1, this.valpha));
if (Object.freeze) {
Object.freeze(this);
}
}
Color.prototype = {
toString: function () {
return this.string();
},
toJSON: function () {
return this[this.model]();
},
string: function (places) {
var self = this.model in colorString.to ? this : this.rgb();
self = self.round(typeof places === 'number' ? places : 1);
var args = self.valpha === 1 ? self.color : self.color.concat(this.valpha);
return colorString.to[self.model](args);
},
percentString: function (places) {
var self = this.rgb().round(typeof places === 'number' ? places : 1);
var args = self.valpha === 1 ? self.color : self.color.concat(this.valpha);
return colorString.to.rgb.percent(args);
},
array: function () {
return this.valpha === 1 ? this.color.slice() : this.color.concat(this.valpha);
},
object: function () {
var result = {};
var channels = convert[this.model].channels;
var labels = convert[this.model].labels;
for (var i = 0; i < channels; i++) {
result[labels[i]] = this.color[i];
}
if (this.valpha !== 1) {
result.alpha = this.valpha;
}
return result;
},
unitArray: function () {
var rgb = this.rgb().color;
rgb[0] /= 255;
rgb[1] /= 255;
rgb[2] /= 255;
if (this.valpha !== 1) {
rgb.push(this.valpha);
}
return rgb;
},
unitObject: function () {
var rgb = this.rgb().object();
rgb.r /= 255;
rgb.g /= 255;
rgb.b /= 255;
if (this.valpha !== 1) {
rgb.alpha = this.valpha;
}
return rgb;
},
round: function (places) {
places = Math.max(places || 0, 0);
return new Color(this.color.map(roundToPlace(places)).concat(this.valpha), this.model);
},
alpha: function (val) {
if (arguments.length) {
return new Color(this.color.concat(Math.max(0, Math.min(1, val))), this.model);
}
return this.valpha;
},
// rgb
red: getset('rgb', 0, maxfn(255)),
green: getset('rgb', 1, maxfn(255)),
blue: getset('rgb', 2, maxfn(255)),
hue: getset(['hsl', 'hsv', 'hsl', 'hwb', 'hcg'], 0, function (val) { return ((val % 360) + 360) % 360; }), // eslint-disable-line brace-style
saturationl: getset('hsl', 1, maxfn(100)),
lightness: getset('hsl', 2, maxfn(100)),
saturationv: getset('hsv', 1, maxfn(100)),
value: getset('hsv', 2, maxfn(100)),
chroma: getset('hcg', 1, maxfn(100)),
gray: getset('hcg', 2, maxfn(100)),
white: getset('hwb', 1, maxfn(100)),
wblack: getset('hwb', 2, maxfn(100)),
cyan: getset('cmyk', 0, maxfn(100)),
magenta: getset('cmyk', 1, maxfn(100)),
yellow: getset('cmyk', 2, maxfn(100)),
black: getset('cmyk', 3, maxfn(100)),
x: getset('xyz', 0, maxfn(100)),
y: getset('xyz', 1, maxfn(100)),
z: getset('xyz', 2, maxfn(100)),
l: getset('lab', 0, maxfn(100)),
a: getset('lab', 1),
b: getset('lab', 2),
keyword: function (val) {
if (arguments.length) {
return new Color(val);
}
return convert[this.model].keyword(this.color);
},
hex: function (val) {
if (arguments.length) {
return new Color(val);
}
return colorString.to.hex(this.rgb().round().color);
},
rgbNumber: function () {
var rgb = this.rgb().color;
return ((rgb[0] & 0xFF) << 16) | ((rgb[1] & 0xFF) << 8) | (rgb[2] & 0xFF);
},
luminosity: function () {
// http://www.w3.org/TR/WCAG20/#relativeluminancedef
var rgb = this.rgb().color;
var lum = [];
for (var i = 0; i < rgb.length; i++) {
var chan = rgb[i] / 255;
lum[i] = (chan <= 0.03928) ? chan / 12.92 : Math.pow(((chan + 0.055) / 1.055), 2.4);
}
return 0.2126 * lum[0] + 0.7152 * lum[1] + 0.0722 * lum[2];
},
contrast: function (color2) {
// http://www.w3.org/TR/WCAG20/#contrast-ratiodef
var lum1 = this.luminosity();
var lum2 = color2.luminosity();
if (lum1 > lum2) {
return (lum1 + 0.05) / (lum2 + 0.05);
}
return (lum2 + 0.05) / (lum1 + 0.05);
},
level: function (color2) {
var contrastRatio = this.contrast(color2);
if (contrastRatio >= 7.1) {
return 'AAA';
}
return (contrastRatio >= 4.5) ? 'AA' : '';
},
isDark: function () {
// YIQ equation from http://24ways.org/2010/calculating-color-contrast
var rgb = this.rgb().color;
var yiq = (rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000;
return yiq < 128;
},
isLight: function () {
return !this.isDark();
},
negate: function () {
var rgb = this.rgb();
for (var i = 0; i < 3; i++) {
rgb.color[i] = 255 - rgb.color[i];
}
return rgb;
},
lighten: function (ratio) {
var hsl = this.hsl();
hsl.color[2] += hsl.color[2] * ratio;
return hsl;
},
darken: function (ratio) {
var hsl = this.hsl();
hsl.color[2] -= hsl.color[2] * ratio;
return hsl;
},
saturate: function (ratio) {
var hsl = this.hsl();
hsl.color[1] += hsl.color[1] * ratio;
return hsl;
},
desaturate: function (ratio) {
var hsl = this.hsl();
hsl.color[1] -= hsl.color[1] * ratio;
return hsl;
},
whiten: function (ratio) {
var hwb = this.hwb();
hwb.color[1] += hwb.color[1] * ratio;
return hwb;
},
blacken: function (ratio) {
var hwb = this.hwb();
hwb.color[2] += hwb.color[2] * ratio;
return hwb;
},
grayscale: function () {
// http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale
var rgb = this.rgb().color;
var val = rgb[0] * 0.3 + rgb[1] * 0.59 + rgb[2] * 0.11;
return Color.rgb(val, val, val);
},
fade: function (ratio) {
return this.alpha(this.valpha - (this.valpha * ratio));
},
opaquer: function (ratio) {
return this.alpha(this.valpha + (this.valpha * ratio));
},
rotate: function (degrees) {
var hsl = this.hsl();
var hue = hsl.color[0];
hue = (hue + degrees) % 360;
hue = hue < 0 ? 360 + hue : hue;
hsl.color[0] = hue;
return hsl;
},
mix: function (mixinColor, weight) {
// ported from sass implementation in C
// https://github.com/sass/libsass/blob/0e6b4a2850092356aa3ece07c6b249f0221caced/functions.cpp#L209
if (!mixinColor || !mixinColor.rgb) {
throw new Error('Argument to "mix" was not a Color instance, but rather an instance of ' + typeof mixinColor);
}
var color1 = mixinColor.rgb();
var color2 = this.rgb();
var p = weight === undefined ? 0.5 : weight;
var w = 2 * p - 1;
var a = color1.alpha() - color2.alpha();
var w1 = (((w * a === -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
var w2 = 1 - w1;
return Color.rgb(
w1 * color1.red() + w2 * color2.red(),
w1 * color1.green() + w2 * color2.green(),
w1 * color1.blue() + w2 * color2.blue(),
color1.alpha() * p + color2.alpha() * (1 - p));
}
};
// model conversion methods and static constructors
Object.keys(convert).forEach(function (model) {
if (skippedModels.indexOf(model) !== -1) {
return;
}
var channels = convert[model].channels;
// conversion methods
Color.prototype[model] = function () {
if (this.model === model) {
return new Color(this);
}
if (arguments.length) {
return new Color(arguments, model);
}
var newAlpha = typeof arguments[channels] === 'number' ? channels : this.valpha;
return new Color(assertArray(convert[this.model][model].raw(this.color)).concat(newAlpha), model);
};
// 'static' construction methods
Color[model] = function (color) {
if (typeof color === 'number') {
color = zeroArray(_slice.call(arguments), channels);
}
return new Color(color, model);
};
});
function roundTo(num, places) {
return Number(num.toFixed(places));
}
function roundToPlace(places) {
return function (num) {
return roundTo(num, places);
};
}
function getset(model, channel, modifier) {
model = Array.isArray(model) ? model : [model];
model.forEach(function (m) {
(limiters[m] || (limiters[m] = []))[channel] = modifier;
});
model = model[0];
return function (val) {
var result;
if (arguments.length) {
if (modifier) {
val = modifier(val);
}
result = this[model]();
result.color[channel] = val;
return result;
}
result = this[model]().color[channel];
if (modifier) {
result = modifier(result);
}
return result;
};
}
function maxfn(max) {
return function (v) {
return Math.max(0, Math.min(max, v));
};
}
function assertArray(val) {
return Array.isArray(val) ? val : [val];
}
function zeroArray(arr, length) {
for (var i = 0; i < length; i++) {
if (typeof arr[i] !== 'number') {
arr[i] = 0;
}
}
return arr;
}
module.exports = Color;