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