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- var nodes = require('../nodes')
- , rgba = require('./rgba');
- /**
- * Return the alpha component of the given `color`,
- * or set the alpha component to the optional second `value` argument.
- *
- * Examples:
- *
- * alpha(#fff)
- * // => 1
- *
- * alpha(rgba(0,0,0,0.3))
- * // => 0.3
- *
- * alpha(#fff, 0.5)
- * // => rgba(255,255,255,0.5)
- *
- * @param {RGBA|HSLA} color
- * @param {Unit} [value]
- * @return {Unit|RGBA}
- * @api public
- */
- function alpha(color, value){
- color = color.rgba;
- if (value) {
- return rgba(
- new nodes.Unit(color.r),
- new nodes.Unit(color.g),
- new nodes.Unit(color.b),
- value
- );
- }
- return new nodes.Unit(color.a, '');
- };
- alpha.params = ['color', 'value'];
- module.exports = alpha;
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