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61 lines
1.0 KiB
61 lines
1.0 KiB
9 years ago
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var utils = require('../utils')
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, nodes = require('../nodes');
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/**
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* Color component name map.
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*/
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var componentMap = {
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red: 'r'
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, green: 'g'
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, blue: 'b'
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, alpha: 'a'
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, hue: 'h'
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, saturation: 's'
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, lightness: 'l'
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};
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/**
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* Color component unit type map.
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*/
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var unitMap = {
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hue: 'deg'
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, saturation: '%'
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, lightness: '%'
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};
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/**
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* Color type map.
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*/
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var typeMap = {
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red: 'rgba'
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, blue: 'rgba'
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, green: 'rgba'
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, alpha: 'rgba'
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, hue: 'hsla'
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, saturation: 'hsla'
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, lightness: 'hsla'
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};
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/**
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* Return component `name` for the given `color`.
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*
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* @param {RGBA|HSLA} color
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* @param {String} name
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* @return {Unit}
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* @api public
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*/
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module.exports = function component(color, name) {
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utils.assertColor(color, 'color');
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utils.assertString(name, 'name');
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var name = name.string
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, unit = unitMap[name]
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, type = typeMap[name]
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, name = componentMap[name];
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if (!name) throw new Error('invalid color component "' + name + '"');
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return new nodes.Unit(color[type][name], unit);
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};
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