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