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Task/Text-processing-2/JavaScript/text-processing-2.js

@@ -0,0 +1,50 @@
+// wrap up the counter variables in a closure.
+function analyze_func(filename) {
+    var dates_seen = {};
+    var format_bad = 0;
+    var records_all = 0;
+    var records_good = 0;
+    return function() {
+        var fh = new ActiveXObject("Scripting.FileSystemObject").openTextFile(filename, 1); // 1 = for reading
+        while ( ! fh.atEndOfStream) {
+            records_all ++;
+            var allOK = true;
+            var line = fh.ReadLine();
+            var fields = line.split('\t');
+            if (fields.length != 49) {
+                format_bad ++;
+                continue;
+            }
+
+            var date = fields.shift();
+            if (has_property(dates_seen, date))
+                WScript.echo("duplicate date: " + date);
+            else
+                dates_seen[date] = 1;
+
+            while (fields.length > 0) {
+                var value = parseFloat(fields.shift());
+                var flag = parseInt(fields.shift(), 10);
+                if (isNaN(value) || isNaN(flag)) {
+                    format_bad ++;
+                }
+                else if (flag <= 0) {
+                    allOK = false;
+                }
+            }
+            if (allOK)
+                records_good ++;
+        }
+        fh.close();
+        WScript.echo("total records: " + records_all);
+        WScript.echo("Wrong format: " + format_bad);
+        WScript.echo("records with no bad readings: " + records_good);
+    }
+}
+
+function has_property(obj, propname) {
+    return typeof(obj[propname]) == "undefined" ? false : true;
+}
+
+var analyze = analyze_func('readings.txt');
+analyze();