Data commit

Task/Align-columns/Kotlin/align-columns.kotlin

@@ -0,0 +1,63 @@
+import java.nio.charset.StandardCharsets
+import java.nio.file.Files
+import java.nio.file.Paths
+
+enum class AlignFunction {
+    LEFT { override fun invoke(s: String, l: Int) = ("%-" + l + 's').format(("%" + s.length + 's').format(s)) },
+    RIGHT { override fun invoke(s: String, l: Int) = ("%-" + l + 's').format(("%" + l + 's').format(s)) },
+    CENTER { override fun invoke(s: String, l: Int) = ("%-" + l + 's').format(("%" + ((l + s.length) / 2) + 's').format(s)) };
+
+    abstract operator fun invoke(s: String, l: Int): String
+}
+
+/** Aligns fields into columns, separated by "|".
+ * @constructor Initializes columns aligner from lines in a list of strings.
+ * @property lines Lines in a single string. Empty string does form a column.
+ */
+class ColumnAligner(val lines: List<String>) {
+     operator fun invoke(a: AlignFunction) : String {
+        var result = ""
+        for (lineWords in words) {
+            for (i in lineWords.indices) {
+                if (i == 0)
+                    result += '|'
+                result += a(lineWords[i], column_widths[i])
+                result += '|'
+            }
+            result += '\n'
+        }
+        return result
+    }
+
+    private val words = arrayListOf<Array<String>>()
+    private val column_widths = arrayListOf<Int>()
+
+    init {
+        lines.forEach  {
+            val lineWords = java.lang.String(it).split("\\$")
+            words += lineWords
+            for (i in lineWords.indices) {
+                if (i >= column_widths.size) {
+                    column_widths += lineWords[i].length
+                } else {
+                    column_widths[i] = Math.max(column_widths[i], lineWords[i].length)
+                }
+            }
+        }
+    }
+}
+
+fun main(args: Array<String>) {
+    if (args.isEmpty()) {
+        println("Usage: ColumnAligner file [L|R|C]")
+        return
+    }
+    val ca = ColumnAligner(Files.readAllLines(Paths.get(args[0]), StandardCharsets.UTF_8))
+    val alignment = if (args.size >= 2) args[1] else "L"
+    when (alignment) {
+        "L" -> print(ca(AlignFunction.LEFT))
+        "R" -> print(ca(AlignFunction.RIGHT))
+        "C" -> print(ca(AlignFunction.CENTER))
+        else -> System.err.println("Error! Unknown alignment: " + alignment)
+    }
+}