Data commit

Task/Commatizing-numbers/Kotlin/commatizing-numbers.kotlin

@@ -0,0 +1,58 @@
+// version 1.1.4-3
+
+val r = Regex("""(\.[0-9]+|[1-9]([0-9]+)?(\.[0-9]+)?)""")
+
+fun String.commatize(startIndex: Int = 0, period: Int = 3, sep: String = ","): String {
+    if ((startIndex !in 0 until this.length) || period < 1 || sep == "") return this
+    val m = r.find(this, startIndex)
+    if (m == null) return this
+    val splits = m.value.split('.')
+    var ip = splits[0]
+    if (ip.length > period) {
+        val sb = StringBuilder(ip.reversed())
+        for (i in (ip.length - 1) / period * period downTo period step period) {
+            sb.insert(i, sep)
+        }
+        ip = sb.toString().reversed()
+    }
+    if ('.' in m.value) {
+        var dp = splits[1]
+        if (dp.length > period) {
+            val sb2 = StringBuilder(dp)
+            for (i in (dp.length - 1) / period * period downTo period step period) {
+                sb2.insert(i, sep)
+            }
+            dp = sb2.toString()
+        }
+        ip += "." + dp
+    }
+    return this.take(startIndex) + this.drop(startIndex).replaceFirst(m.value, ip)
+}
+
+fun main(args: Array<String>) {
+    val tests = arrayOf(
+        "123456789.123456789",
+        ".123456789",
+        "57256.1D-4",
+        "pi=3.14159265358979323846264338327950288419716939937510582097494459231",
+        "The author has two Z$100000000000000 Zimbabwe notes (100 trillion).",
+        "-in Aus$+1411.8millions",
+        "===US$0017440 millions=== (in 2000 dollars)",
+        "123.e8000 is pretty big.",
+        "The land area of the earth is 57268900(29% of the surface) square miles.",
+        "Ain't no numbers in this here words, nohow, no way, Jose.",
+        "James was never known as 0000000007",
+        "Arthur Eddington wrote: I believe there are " +
+        "15747724136275002577605653961181555468044717914527116709366231425076185631031296" +
+        " protons in the universe.",
+        "   $-140000±100 millions.",
+        "6/9/1946 was a good year for some."
+    )
+
+    println(tests[0].commatize(period = 2, sep = "*"))
+    println(tests[1].commatize(period = 3, sep = "-"))
+    println(tests[2].commatize(period = 4, sep = "__"))
+    println(tests[3].commatize(period = 5, sep = " "))
+    println(tests[4].commatize(sep = "."))
+    for (test in tests.drop(5)) println(test.commatize())
+}