tasks a-s

Task/Range-expansion/Java/range-expansion.java

@@ -0,0 +1,66 @@
+import java.util.*;
+import java.util.regex.*;
+
+class Range implements Enumeration {
+  private int clower, cupper;
+  private int value;
+  private boolean inrange;
+  private Scanner ps = null;
+  private String ss;
+
+  private static String del = "\\s*,\\s*";
+
+  public Range(String s) {
+    ss = s;
+    reset();
+  }
+
+  public boolean hasMoreElements() {
+    return (inrange && (value >= clower && value <= cupper)) || ps.hasNext();
+  }
+
+  public Object nextElement() throws NoSuchElementException {
+    if (!hasMoreElements())
+      throw new NoSuchElementException();
+    if (inrange && (value >= clower && value <= cupper)) {
+      value++;
+      return value-1;
+    }
+    inrange = false;
+    String n = ps.next();
+    if (n.matches("[+-]?\\d+-[+-]?\\d+")) {
+      Scanner ls = new Scanner(n);
+      ls.findInLine("([+-]?\\d+)-([+-]?\\d+)");
+      MatchResult r = ls.match();
+      clower = Integer.parseInt(r.group(1));
+      cupper = Integer.parseInt(r.group(2));
+      value = clower+1;
+      inrange = true;
+      ls.close();
+      return clower;
+    }
+    return Integer.parseInt(n);
+  }
+
+  public void reset() {
+    if (ps != null)
+      ps.close();
+    ps = new Scanner(ss).useDelimiter(del);
+    inrange = false;
+  }
+
+  protected void finalize() throws Throwable {
+    ps.close();
+    super.finalize();
+  }
+}
+
+class rangexp {
+  public static void main(String[] args) {
+    Range r = new Range("-6,-3--1,3-5,7-11,14,15,17-20");
+    while (r.hasMoreElements()) {
+      System.out.print(r.nextElement() + " ");
+    }
+    System.out.println();
+  }
+}