Add tasks for all the new languages

Task/Text-processing-1/Sidef/text-processing-1.sidef

@@ -0,0 +1,33 @@
+var gaps = [];
+var previous = :valid;
+
+ARGF.each { |line|
+    var (date, *readings) = line.words...;
+    var valid = [];
+    var hour = 0;
+    readings.map{.to_n}.each_slice(2, { |slice|
+        var(reading, flag) = slice...;
+        if (flag > 0) {
+            valid << reading;
+            if (previous == :invalid) {
+                gaps[-1]{:end} = "#{date} #{hour}:00";
+                previous = :valid;
+            }
+        }
+        else {
+            if (previous == :valid) {
+                gaps << Hash(start => "#{date} #{hour}:00");
+            }
+            gaps[-1]{:count} := 0 ++;
+            previous = :invalid;
+        }
+        ++hour;
+    })
+    say ("#{date}: #{ '%8s' % (valid ? ('%.3f' % Math.avg(valid...)) : 0) }",
+         " mean from #{ '%2s' % valid.len } valid.");
+}
+
+var longest = gaps.sort_by{|a| -a{:count} }.first;
+
+say ("Longest period of invalid readings was #{longest{:count}} hours,\n",
+    "from #{longest{:start}} till #{longest{:end}}.");