KJS: introduce new base class WebDemoExamples* tests

js/js.translator/testData/webDemoExamples2/bottles.kt

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+/**
+ * This example implements the famous "99 Bottles of Beer" program
+ * See http://99-bottles-of-beer.net/
+ *
+ * The point is to print out a song with the following lyrics:
+ *
+ *     The "99 bottles of beer" song
+ *
+ *     99 bottles of beer on the wall, 99 bottles of beer.
+ *     Take one down, pass it around, 98 bottles of beer on the wall.
+ *
+ *     98 bottles of beer on the wall, 98 bottles of beer.
+ *     Take one down, pass it around, 97 bottles of beer on the wall.
+ *
+ *       ...
+ *
+ *     2 bottles of beer on the wall, 2 bottles of beer.
+ *     Take one down, pass it around, 1 bottle of beer on the wall.
+ *
+ *     1 bottle of beer on the wall, 1 bottle of beer.
+ *     Take one down, pass it around, no more bottles of beer on the wall.
+ *
+ *     No more bottles of beer on the wall, no more bottles of beer.
+ *     Go to the store and buy some more, 99 bottles of beer on the wall.
+ *
+ * Additionally, you can pass the desired initial number of bottles to use (rather than 99)
+ * as a command-line argument
+ */
+
+fun main(args: Array<String>) {
+    if (args.isEmpty()) {
+        printBottles(99)
+    }
+    else {
+        val bottles = args[0].toIntOrNull()
+        if (bottles != null) {
+            printBottles(bottles);
+        }
+        else {
+            println("You have passed '${args[0]}' as a number of bottles, " +
+                    "but it is not a valid integral number")
+        }
+    }
+}
+
+fun printBottles(bottleCount: Int) {
+    if (bottleCount <= 0) {
+        println("No bottles - no song")
+        return
+    }
+
+    println("The \"${bottlesOfBeer(bottleCount)}\" song\n")
+
+    var bottles = bottleCount
+    while (bottles > 0) {
+        val bottlesOfBeer = bottlesOfBeer(bottles)
+        print("$bottlesOfBeer on the wall, $bottlesOfBeer.\nTake one down, pass it around, ")
+        bottles--
+        println("${bottlesOfBeer(bottles)} on the wall.\n")
+    }
+    println("No more bottles of beer on the wall, no more bottles of beer.\n" +
+            "Go to the store and buy some more, ${bottlesOfBeer(bottleCount)} on the wall.")
+}
+
+fun bottlesOfBeer(count: Int): String =
+        when (count) {
+            0 -> "no more bottles"
+            1 -> "1 bottle"
+            else -> "$count bottles"
+        } + " of beer"
+
+// From the std package
+// This is an extension property, i.e. a property that is defined for the
+// type Array<T>, but does not sit inside the class Array
+fun <T> Array<T>.isEmpty() = size == 0