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

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

@@ -0,0 +1,59 @@
+var utils = require('../utils')
+  , nodes = require('../nodes');
+
+/**
+ * Return a `RGBA` from the r,g,b,a channels.
+ *
+ * Examples:
+ *
+ *    rgba(255,0,0,0.5)
+ *    // => rgba(255,0,0,0.5)
+ *
+ *    rgba(255,0,0,1)
+ *    // => #ff0000
+ *
+ *    rgba(#ffcc00, 50%)
+ *    // rgba(255,204,0,0.5)
+ *
+ * @param {Unit|RGBA|HSLA} red
+ * @param {Unit} green
+ * @param {Unit} blue
+ * @param {Unit} alpha
+ * @return {RGBA}
+ * @api public
+ */
+
+module.exports = function rgba(red, green, blue, alpha){
+  switch (arguments.length) {
+    case 1:
+      utils.assertColor(red);
+      return red.rgba;
+    case 2:
+      utils.assertColor(red);
+      var color = red.rgba;
+      utils.assertType(green, 'unit', 'alpha');
+      alpha = green.clone();
+      if ('%' == alpha.type) alpha.val /= 100;
+      return new nodes.RGBA(
+          color.r
+        , color.g
+        , color.b
+        , alpha.val);
+    default:
+      utils.assertType(red, 'unit', 'red');
+      utils.assertType(green, 'unit', 'green');
+      utils.assertType(blue, 'unit', 'blue');
+      utils.assertType(alpha, 'unit', 'alpha');
+      var r = '%' == red.type ? Math.round(red.val * 2.55) : red.val
+        , g = '%' == green.type ? Math.round(green.val * 2.55) : green.val
+        , b = '%' == blue.type ? Math.round(blue.val * 2.55) : blue.val;
+
+      alpha = alpha.clone();
+      if (alpha && '%' == alpha.type) alpha.val /= 100;
+      return new nodes.RGBA(
+          r
+        , g
+        , b
+        , alpha.val);
+  }
+};