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- var utils = require('../utils');
- /**
- * Adjust HSL `color` `prop` by `amount`.
- *
- * @param {RGBA|HSLA} color
- * @param {String} prop
- * @param {Unit} amount
- * @return {RGBA}
- * @api private
- */
- function adjust(color, prop, amount){
- utils.assertColor(color, 'color');
- utils.assertString(prop, 'prop');
- utils.assertType(amount, 'unit', 'amount');
- var hsl = color.hsla.clone();
- prop = { hue: 'h', saturation: 's', lightness: 'l' }[prop.string];
- if (!prop) throw new Error('invalid adjustment property');
- var val = amount.val;
- if ('%' == amount.type){
- val = 'l' == prop && val > 0
- ? (100 - hsl[prop]) * val / 100
- : hsl[prop] * (val / 100);
- }
- hsl[prop] += val;
- return hsl.rgba;
- };
- adjust.params = ['color', 'prop', 'amount'];
- module.exports = adjust;
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