Roughing out the demo app

node_modules/nanoid/format.js

@@ -0,0 +1,52 @@
+/**
+ * Secure random string generator with custom alphabet.
+ *
+ * Alphabet must contain 256 symbols or less. Otherwise, the generator
+ * will not be secure.
+ *
+ * @param {generator} random The random bytes generator.
+ * @param {string} alphabet Symbols to be used in new random string.
+ * @param {size} size The number of symbols in new random string.
+ *
+ * @return {string} Random string.
+ *
+ * @example
+ * const format = require('nanoid/format')
+ *
+ * function random (size) {
+ *   const result = []
+ *   for (let i = 0; i < size; i++) {
+ *     result.push(randomByte())
+ *   }
+ *   return result
+ * }
+ *
+ * format(random, "abcdef", 5) //=> "fbaef"
+ *
+ * @name format
+ * @function
+ */
+module.exports = function (random, alphabet, size) {
+  var mask = (2 << 31 - Math.clz32((alphabet.length - 1) | 1)) - 1
+  var step = Math.ceil(1.6 * mask * size / alphabet.length)
+  var id = ''
+  size = +size
+
+  while (true) {
+    var bytes = random(step)
+    for (var i = step; i--;) {
+      var byte = bytes[i] & mask
+      var alpha = alphabet[byte]
+      if (alpha) {
+        id += alpha
+        if (id.length === size) return id
+      }
+    }
+  }
+}
+
+/**
+ * @callback generator
+ * @param {number} bytes The number of bytes to generate.
+ * @return {number[]} Random bytes.
+ */