complete redesign: use nodejs on server instead of php - documentation to be updated

nodejs/node_modules/stylus/lib/functions/component.js

@@ -0,0 +1,60 @@
+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
+ */
+
+module.exports = 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);
+};