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- var nodes = require('../nodes')
- , hsla = require('./hsla')
- , component = require('./component');
- /**
- * Return the lightness component of the given `color`,
- * or set the lightness component to the optional second `value` argument.
- *
- * Examples:
- *
- * lightness(#00c)
- * // => 100%
- *
- * lightness(#00c, 80%)
- * // => #99f
- *
- * @param {RGBA|HSLA} color
- * @param {Unit} [value]
- * @return {Unit|RGBA}
- * @api public
- */
- function lightness(color, value){
- if (value) {
- var hslaColor = color.hsla;
- return hsla(
- new nodes.Unit(hslaColor.h),
- new nodes.Unit(hslaColor.s),
- value,
- new nodes.Unit(hslaColor.a)
- )
- }
- return component(color, new nodes.String('lightness'));
- };
- lightness.params = ['color', 'value'];
- module.exports = lightness;
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