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

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

@@ -0,0 +1,34 @@
+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
+ */
+
+module.exports = 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'));
+};